Aircraft wood spar. they produce a small effect on grain direction.
Aircraft wood spar. they produce a small effect on grain direction.
Aircraft wood spar Option 1. 5. The flanges (the spar caps) usually consist of 1/8” x 1/2” bass wood resting in notches in the ribs. splice in a new section of the spar and drill new holes. the section of spar or the entire spar must be replaced 3. TFF Well-Known Member. Selection and Properties of Aircraft Wood. You can watch my detailed videos Wood Spar Nail - 14 Gauge Flat, bonderized steel nails, brass plated to prevent rusting and cement coated to improve holding power. and it would be a fun exercise in high lift systems for very light aircraft (like the Suitcase Airplane I All drilled & varnished with 3 coats of epoxy spar varnish. The ideal range of moisture content in a wood aircraft structure is _____ percent, with any readings over _____ percent providing an environment for the growth of fungus in the wood. However, selection and ap- Fungal growth can occur in aircraft wood structure when the moisture content is at or above: 20%. But AVweb's Matt Paxton does, and he continues his saga of building a classic Pietenpol Air Camper. Member. Study with Quizlet and memorize flashcards containing terms like Laminated wood spars may be substituted for solid rectangular wood spars, The strength of a well-designed and properly prepared wood splice joint is provided by the, Where is information fond concerning acceptable's species substitutions for wood materials used in aircraft repair? and more. As aircraft design and manufacturing evolved, the development of lightweight metals and the demand for increased production moved the industry away from aircraft constructed entirely of wood. decay, musty, In cases of elongated boltholes in a spar, or cracks in the vicinity of boltholes, a new spar section should be spliced in, or the spar should be replaced. Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. A Sharp metal tool. Study with Quizlet and memorize flashcards containing terms like Laminated wood spars may be substituted for solid rectangular wood spars?, The strength of a well-designed and properly prepared wood splice joint is provided by the, Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair? and more. Wooden I-beams are commonly used for floor and ceiling joists in wooden structures, with the caps often made of 2×4 material laid on its side, and the webs made from relatively thin plywood. A wing spar _____ be spliced under the fitting for a lift strut. Some general aviation aircraft were produced with wood spars and wings, but today only a limited number of wood aircraft are produced. sku:-3/4-14NAIL-3/4-14NAIL ANNULAR RINGED NAIL - 14 GAUGE to the extent required by Federal law obtains approval from the FAA for the manufacture of replacement parts for aircraft. Others may Study with Quizlet and memorize flashcards containing terms like What is the danger of a wooden aircraft structure in which the wood holds a moisture content of over 20%?, In order to properly inspect wood structure of an aircraft, the wooden components must be _______, Glued joints are typically designed to take what type of load? and more. MATERIALS AND PRACTICES 1-1. In fact, American Champion has never offered a wood spar wing. J. 36, a minimum density of 24 pounds per cubic foot, grain slope no steeper than one in 15, and a moisture content between 10 and 17 percent. 4 (8012) When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by using (8004) In cases of elongated bolt holes in a wood spar or cracks in the vicinity of boltholes, a new section What is the correct repair to a wooden aircraft wing spar if the wing-attach bolt holes in the spar are elongated? Splice in a new section of the spar and drill new holes. Table 1-1 lists some permissible variations in characteristics and properties of aircraft wood. [Figure 6-1] were produced with wood spars and wings, spar is an original part, and that all materials and dimensions can be determined. Trying to figure out if they are useful to anyone or does everyone go metal spar now. Straight, mostly clear 2x8x up to 18'. Comment. When you, as the builder, need a finished 6-inch spar for your aircraft the supplier may have difficulty providing that dimension. Explore and master different methods of aircraft wood spar repair with our engaging quiz and flashcards. increase strength. Study with Quizlet and memorize flashcards containing terms like How would you identify compression failure in an aircraft wooden (rectangular wing) spar?, You, as an IA are performing an inspection on a wooden aircraft and notice dark spots (stains) in the wood. American Champion has been using aluminum spars in the aircraft it has produced and has, as well, made the aluminum-spar wings available for retrofit installation on older aircraft. Request quote on spar widths wider than 6". The spar is a boxed I-beam (with three laminations of spruce for top caps and three for bottom caps) for the first two feet, John Gaertner shows how to do an aircraft spruce splice for a wing. a new section of spar should be spliced in or the spar replaced entirely. What is the minimum taper to use when repairing a wood wing rib cap strip? 12 The airplane I'm planning on building uses two wood caps to form the spar. The I beam wooden spar is routed to a. Thousands of feet of S2S aircraft quality spruce are stocked in our Corona, CA. Flying the I-Beam. Splices and scarf cuts must have the correct slope and the face grain should run in the same direction as the original member. At 10 feet on the semispan, only 3 plys are needed and this is continued out to the tip. The _____ (lowest or highest) points inside an aircraft structure are the most likely places for wood deterioration to begin. Bob Smalser. A faint line running This change is the core difference between new aircraft and older models (1980 and older). . Wood ribs are usually manufactured from spruce. Insert the plug with the grain aligned to the surface wood. C. Latest: dreamcatcher43; 17 minutes ago; Classifieds - For Sale & Wanted. However, the seeds of doubt have been firmly planted and I'm not sure I'm comfortable with a wood spar aircraft. Right spar replaced in 1982 (before the accident) Aircraft was Study with Quizlet and memorize flashcards containing terms like What is the danger of a wooden aircraft structure in which the wood holds a moisture content of over 20 % ?, In order to properly inspect wood structure of an aircraft , the wooden components must be, Glued joints are typically designed to take what type of load ? and more. Other structural and forming members such as ribs may be attached to the spar or spars, with stressed skin construction also sharing Title: American Champion Aircraft Corporation 7, 8, and 11 Series Airplanes Date: July 13, 2001 Subject: Inspection of Wood Wing Spars OPEN PDF sides of the spar. Subscribe to our weekly newsletter New product announcements, promotions, discounts, & events. 8‐12%, 20% 2. Cut of the wood B. compression failure. 00 in the planeless than half for new champion wings and no more ad--well worth it and millman co. reduce weight b. Basswood and Basswood Plywood Aircraft Grade MIL-P-6070 Study with Quizlet and memorize flashcards containing terms like Laminated wood spars may be substituted for solid rectangular wood spars?, The strength of a well-designed and properly prepared wood splice joint is provided by the, Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair? and more. Figure out what kind of flying suits you best and fly the aircraft that fills that purpose. Another method of detecting water penetration is to remove the bolts holding the fittings at spar root-end joints, aileron hinge brackets, etc. 4 round head wood screws. This Type A Aircraft Wood and Structural Repair. 1-3 Figure 1-2. The bottom spar needs 12 plys at the root and reaches 3 plys at 8 feet. A weakening of the glued joints. What kind of repair is recommended for a hole in the plywood skin of Preparation of Wood for Gluing - Repair of Wood Aircraft Structures Satisfactory glue joints in aircraft should develop the full strength of the wood under all conditions of stress. Figure 22. The nominal 6" width may only finish to slightly over 5" when the Wood aircraft structures are held together with glues . The wood would be inspected, scarfed at 1:12 or so, cleaned and glued straight to make the required length plus some spare. FP202 and typical 3/4 cub wing spar. c. Fill in the Blanks. 2. Wood Spar Nail - 14 Gauge Flat, bonderized steel nails, brass plated to prevent rusting and cement coated to improve holding power. To produce this result, the conditions involved in the gluing operation must be carefully controlled to obtain a continuous, thin, uniform film of solid glue in the joint with adequate adhesion to both surfaces of the wood. All wood and ply - wood used in the repair of aircraft structures should be of aircraft quality (reference Army Navy Commerce Department Bulletin ANC -19, W ood Aircraft Inspection and Fabr i-cation). Study with Quizlet and memorize flashcards containing terms like In cases of elongated bolt holes in a wood spar or cracks in the vicinity of boltholes,, The strength of a well-designed and properly prepared wood splice joint is provided by the, Which of the following conditions will determine acceptance of wood with mineral streaks? and more. Unfortunately, there are only a few '70s with the spar replacement and they are out of my price range. 1. Left spar was replaced in 2000. Join Date: Jun 2003 suitable wood for spar-making I found Black Spruce at the local lumberyard here. spar replacement A friend I replaced my 7ac conv. Spars wider than 6" must be milled from 8" specially selected stock which requires a long and indefinite An example of a safe-life versus failsafe structure is shown in the figure below for a wing spar, a critical aircraft component. Purpose To provide basic guidance in summary form to assist properly authorised persons considering the substitution of structural wood, Where is the information found concerning acceptable species substitutions for wood materials used in aircraft repair. call them adhesives if you want. Other structural and forming members such as ribs may be attached to the spar or spars, with stressed skin construction also sharing The metal spar wing has more than twice the rigidity of the wood spar wing in bending. G. c) perpendicular grain construction. Study with Quizlet and memorize flashcards containing terms like Compression Failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface how?, A faint line running across the grain of wood spar generally indicates what?, Laminated wood is sometimes used in the construction of highly stressed aircraft components. 1 Which statement concerning wood decay is correct? and more. List some of the relative advantages of wood and fabric airplane Study with Quizlet and memorize flashcards containing terms like In cases of elongated bolt holes in a wood spar or cracks in the vicinity of boltholes ? A New section of spar should be spliced in or the spar replaced entirely. This SDR contains the following information: Subject spar indicated irregular lines across the grain at 163 inches from the root end. Because of the load the spar carries, it is very important that particular care be taken when Our STC aluminum spar conversion kit uses all of the existing parts from the aircraft’s wings, except of course for the wood spars. Look at Carlson aircraft rib,spar and strut material . Do any of you have experience with this repair on the Pitts or other aircraft? Any suggestions? WOOD GLUE. Are acceptable in wood components if they are max . The key weakness in spruce (and wood in general) used for wing spars I've learned over the years is the propensity for dormant failures in compression, typically following a wing tip strike on a strut braced airplane, Aircraft of wooden construction or which contain major components made from wood, such as wing spars. I have recently acquired a Cub project which has been previously worked on. Apply the pressure to the patch by means of the wood screws. Airplane For Sale Acroduster Too project for sale. the spar may be reinforced using a similar wood as splice plates Aircraft plywood seems like it will be around for a long time, if nothing else the Finnish birch type from sustainably managed forests, but spar quality spruce seems to be getting harder and harder to find. Wood was the material of choice for aircraft construction into the 1930s. Joined Mar 26, 2016 Messages 1 Study with Quizlet and memorize flashcards containing terms like 8009 Pin knot clusters are permitted in wood aircraft structure provided, 8005 A faint line running across the grain of a wood spar generally indicates, 8006. There are several plans today that are simply copies of designs from the 1930's. The metal spar wings can retrofit to any of the older Citabria line and offer an affordable alternative (and upgrade) to rebuilding an old pair of wings. The three most common types of wooden ribs are the plywood web, the lightened plywood web, and the The ideal range of moisture content in a wood aircraft structure is _____ percent, with any readings over _____ percent providing an environment for the growth of fungus in the wood. Wood was among the first materials used to construct aircraft. Evaluations of the quality of wood must take into account the: Quarter, shrinkage. Drill holes around the plug’s circumference to accept No. What kind of repair is recommended for a hole in the plywood skin of an aircraft wing? A scarf patch. Shop By Brand; Spar Kits. In Part Two, Matt takes us through the joys and agonies of constructing the most critical part of any airplane: the wings. for the Fly Baby, the VP-1, and the Pietenpol Aircamper (a 1930’s Note: Full sheets are 4' x 4' and half sheets are 2' x 4', with the exception of 02-00236 which are furnished in 61" x 61" full sheets. Looking at a possible purchase (1966 Citabria) and have a concern about the wooden spar. 5 times in length as the width of the wood. ac 43. Study with Quizlet and memorize flashcards containing terms like Glue deterioration in wood aircraft structure is indicated, Laminated wood spars may be substituted for solid rectangular wood spars, A faint line running across the grain of a wood spar generally indicates and more. Extend the plates well be-yond the termination of the cracks, as shown in figure 1-10. Does this sound reasonable? Hi all, first time poster here. To produce this result, the conditions involved in the gluing operation must be carefully controlled to obtain a continuous, thin, uniform film of solid glue in the joint with adequate adhesion to both surfaces Chapter 6 Aircraft Wood and Structural Repair Aircraft Wood and Structural Repair Wood was among the first materials used to construct aircraft. Back Shopping Tools; Aircraft Spruce Gift Card Shop Now. Widths over 6 inches are scarce. Example if the cap is 6 inches wide and 1 Study with Quizlet and memorize flashcards containing terms like It is the responsibility of the _____ to carefully inspect wood structures for deterioration and continued airworthiness, When replacing damaged wood in aircraft structures you may find permissible substitutes in, Mineral streaks are found on a structural member, no decay is noted and more. scarf joint- should have said "the joint is 6. Right spar replaced in 1982 (before the accident) Aircraft was Aircraft Spruce is a worldwide distributor of certified and homebuilt aircraft supplies. Yes, there are solutions like laminated spars, but at some point even that will be problematic. 375 in diameter. Aircraft Wood - 877 FAA 8083 Airframe Workbook v3. Extending wings j3jm; Oct 14, 2003; Cafe Supercub; Replies 9 Views 4K. I'm about to start on a 4M scale ship - all wood construction, and was curious which wood was best for spar material? Plans call for top and bottom spars 3/16" x 1/2", span is 158". 00. Approximate weight is based on 4′ X 8′ sheets. , In order to properly inspect wood structure of an aircraft, the wooden components must All SPARS are proven strength – 6061-T6 extruded aluminum with an ultimate yield in tension of 45,000 PSI and in shear of 30,000 PSI. Piper J-3 Wing Spar-To-Fuselage Fitting Kit for wood spar wing only. it is permissible to ream out the holes and use an oversized bolt 2. Something caused one spar to crack. What's it like to start with a Study with Quizlet and memorize flashcards containing terms like A faint line running across the grain of a wood spar generally indicates, Pin knot clusters are permitted in wood aircraft structure provided, Which of the following types of wood has the greatest strength properties? and more. what is the correct repair to a wooden aircraft wing spar if the wing attach bolt holes in the spar are elongated. When cold setting glues are coated on wood parts and left exposed to the atmosphere for a predetermined time, the procedure is termed: What is the correct repair to a wooden aircraft wing spar if the wing-attach bolt holes in the spar are elongated? Splice in a new section of the spar and drill new holes. This should make the spar stronger than it was originally we think. fiberglass and Our spars are available either S2S (surfaced 2 sides, top & bottom, with rough edges in 4" & 6" Some general aviation aircraft wood. the repairs to solid or laminated spars are never permitted and the spar should be replaced with a new one from manufacturer. I also am an avid how-to writer. a scarf patch. Sport Aviation December, 1998 by Ron Alexander. Quality Birch Aircraft grade plywood produced to AB/B grade on all thicknesses. Study with Quizlet and memorize flashcards containing terms like A certificated mechanic who has not performed repairs to wooden aircraft before is not allowed to perform repairs to a wood aircraft structure, When inspecting an aircraft constructed or comprised of wood components the moisture content must be above 20%, Some slight sectional undulation or bulging between No new designs based on wood structures were being generated and consequently, no new progress with wood was made. All solid wood and plywood used for the Some general aviation aircraft were produced with wood spars and wings, but today only a FAA Advisory Circular 43-13 lists a number of different types of wood that may be used in an aircraft structure. Manufacturers used the material in the construction of a large number of aircraft. Cement coated nail for wood spar wings Length: 3/4 inch Gauge: 18 Sold by the ounce (approximately 160/ounce) $1. wood spars w/millman spars, I also added new safe air 13 gal tanks,new leading edges,trailing edges,and about 6 or so new ribs,and with fabric and paint and rigging had about 7500. Their products page has info for Champ, Citabria aircraft through Being my build started as a wood spar and rib, fabric build I knew achieving the needed performance was not going to happen so I then designed with a composite top skin and LE. This wood can be identified by its. There went the rest of my skepticism. He knew or should have known from the event briefing that aircraft would be crossing there. , 2- The strength of a well-designed and properly prepared wood splice joint is provided by the . Since we got started with wood, there’s no reason why we can’t continue that train of thought for a while. 72. Glue is the material used almost exclusively as a means of joining wood in aircraft construction. Aircraft Wood and Structural Repair Wood was among the first materials used to construct aircraft. The few aircraft designs that did use wood after that time period were based on older designs. 13-1b 9/8/98 contents (continued) paragraph page page vi chapter 3. This wood can be identified by its a) parallel grain construction. the spar maybe reinforced by using hardwood reinforcing plates. Answers - Aircraft Wood and Structural Repair. Laminated spar Few of us have the courage, attention span, or time to build a kitplane, much less a plans-build aircraft from scratch. Post Cancel. b. It appears that it does in fact provide limitations for such damage B/10 for instance and it appears that B = the height of the spar. The metal spar wings required all new ribs tank supports, and drag truss parts to be assembled. A method of repairing small local damage to either the top or bottom side of a spar is also shown in fi gure 1-10. Recently Searched No results found Tags The I beam wooden spar is routed to: a. A damaged spar in an aircraft can be spliced at almost any point, except at certain fittings. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other In a nut shell, No. After the glue has set, remove the screws and fill the nail and screw holes. From an engineering aspect, the metal spar wing takes many practices into account that the wood wing does not. 13 it sure looks like we should be able to repair the spar by gluing the crack back together and adding 1/4" doublers along each side out to the tip. Reactions don't hit anything with your wingtip, and a wood spar will outlast the rest of the aircraft by a bunch! I am going to guess that a spar fails the inspection Looking at a possible purchase (1966 Citabria) and have a concern about the wooden spar. Guess what we found? A pristine wing and spars. As the aircraft design and manufacturing evolved, the development of lightweight metals and the demand for increased production moved the industry away from aircraft constructed entirely of wood. , Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface ? At right angles to the grain The reference wood for aircraft structures is _____ A. it is permissible to ream the hole, plug with hardwood, and redrill. So, the metal spar wing only shares a small handful of parts with the the spar may be reinforced by using hardwood reinforcing plates. View Assessment - WOOD STRUCTURES. The growth of fungus. A word of caution; before making any firm decision about you spars find an EAA group near you and find someone who knows wooden aircraft structureswhile there are many on this forum who are versed in wood spars its still guys looking at pictures on the Laminated wood is sometimes used in the construction of highly stressed aircraft components. In a fixed-wing aircraft, the spar is often the main structural member of the wing, running spanwise at right angles (or thereabouts depending on wing sweep) to the fuselage. Precision CNC machined aluminum billet spacers are used at all high stressed attach points and five ply birch plywood (for weight saving) is used on the lightly loaded rib attach points. For the top spar cap what I ended up with is 21 plys at the root. 2‑5: Typical Wooden Wing Spar Cross-Sections (FAA-H-8083-31, 2012) Aircraft with wood wing spars may have wood or metal ribs while most aircraft with metal spars have metal ribs. I've been thinking about finishing off the top surface of the spar with a strip of wood, to which thin plywood would be glued to on each side, glued also to the central spar web geodesic design, essentially creating a thin box spar. Aircraft having wood spars and o p- The normal moisture content of plywood (like aircraft wood) is approximately 12%. Wood Spar Splice glassjet; Apr 9, 2005; Experimental Cubs; Replies 5 Views 3K. In cases of elongated boltholes in a wood spar or cracks in the vicinity of boltholes, A) the spar may be reinforced by using hardwood reinforcing plates. Quick Shop. When a satisfactory repair to a spar cannot be accomplished, the spar should be replaced. Number of growth rings. Corrosion on the surface of such bolts and wood discoloration provide a useful indication of Selection and properties of wood for aircraft repairs. Most of the airplanes built during World War I (WWI) were constructed of wood frames with fabric coverings. Most of the airplanes built during World War I (WWI) were Ply spar web Inspection hole in web Metal fitting Bolt A A A A A At all points marked , check A for glue condition and separation with a feeler gauge. . No other pressure is necessary. A component part is considered joined satisfactorily if the strength of the glue joint is approximately equal to the strength of the wood itself. b) no external bracing Aircraft Wood. My front spar measurements are: 13/16 x 5 5/8 x 202 3/4 (Ordering 13/16 x 6 x 216) Rear spar measurements are 7/8 x 4 1/16 x 193 3/4; Order 4 1/4" and have it cut to 4 1/8 or 4" Wing Spar repair- For a longitudinal crack in a wood spar scrape away the finish on both sides of the spar and glue reinforcing plates of spruce or plywood on each side of it. b) similarity to standard plywood construction. , The strength of a well designed and properly prepared wood splice joint is provided by the, Where is information found concerning acceptable species substitutions for wood material used in aircraft repair? and more. C) it is permissible to The FAA noted that all of these aircraft have a common spar design, with varying degrees of reinforcement in the original structure. This particular aircraft has damage history -1983 hard landing - collapsed gear and damage to wingtips. The use of Sitka Spruce for all components in the (8009) Pin knot clusters are permitted in wood aircraft structures provided. Way too straight to be a crack IMPO. 1/10th. a. Joined Apr 28, 2010 Messages 22,242 Location Lake Providence, La. Links to some of the tools we used for this project. decay. I have a nomogram too from a different source (its italian) for the design of wooden box spar structure, let me know if you want it. The di This spec says the wood must have a specific gravity greater than . In cases of elongated bolt holes in a wood spar or cracks in the vicinity of bolt holes. , The cantilever wing uses a) external struts or wire bracing. , 3- Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair? and more. Apr 10, 2005. Add to Cart. false. Some of these are Douglas Fir, Noble Fir, Western Hemlock, White Pine, White Cedar, and Yellow Poplar. SpainCub Registered User. J4 full rib, wood spar, position 1-6. Hard knots. The species of wood used by the FAA as the reference wood for aircraft structure. Study with Quizlet and memorize flashcards containing terms like The I-beam wooden spar is routed to?, In cases of elongated boltholes in a wood spar or cracks in the vicinity of boltholes?, Which of the following conditions will determine acceptance of wood Study with Quizlet and memorize flashcards containing terms like A faint line running across the grain of a wood spar generally indicates, There are many different types of wooden spar designs employed by aircraft manufacturers. The nominal 6-inch width may only finish to slightly over 5 inches when the edges are cut smooth. Tapering of Faceplate Repairs to Built-Up “I” Spar Wooden aircraft are more prone to the damaging effects of water, especially without the protection of covered storage. Considered an upgrade over original wood spars mostly due to the way the doubler plates at the strut attach points are designed to distribute stresses more evenly into the underlying spruce. glue. The reference to the name of On the Citabrias, the wood wing weighs about 50-60 lbs less than the metal one. what kind of repair is recommended for a hole in the plywood skin of an aircraft wing. New product announcements, promotions, discounts, & events. Front and Rear one each. Just curious if anyone actually uses wood spars in a restoration/rebuild. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done Figure out what kind of flying suits you best and fly the aircraft that fills that purpose. Fore and aft spar faces cleaned and sanded & the vertical lines remained. Nonetheless, a small amount of performance can Study with Quizlet and memorize flashcards containing terms like 1- Laminated wood spars may be substituted for solid rectangular wood spars . May 15, 2018 #7 don d said: Full rib for J3 Wood Spar, Rib Position # 2,3, & 4 on both Wings, Piper # 13052-02 This position has also been supported by an SDR on an ACAC Model 7GCBC airplane on the aft spar. Pin knot clusters are permitted in wood aircraft structure provided. A3. The greater the span, the deeper the spar. Wing Bolt/Fastener Kit (for wood spar) Thread starter asharpe; Start date Nov 14, 2017; This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others. Locate procedures for selecting glue used for wood structure repairs (Level 1) AC43. (like wing area and airfoil) are the same and still dominate the basis for aircraft performance. 13. 16. Rot-inhibiting To prevent wood structure rotting, it should be treated with a(n) _______ sealer MIL-P-6070B is laminated in hot press with waterproof glue. they produce a small effect on grain direction. if elongated bolt holes are discovered while inspecting a wooden wing spar, which is the minimum required repair? 1. Have questions? Call 605-757-6628 or email mmorford@dakotacub. 45° grain runs diagonal (use for spar facing). Study with Quizlet and memorize flashcards containing terms like Since wood is an organic material, it is subject to mildew and rot unless it is adequately protected from moisture- True or False?, What is the minimum bevel allowed for a splice in a wood wing spar?, When patching a plywood skin, abrupt changes in cross directional areas which will develop dangerous stress Study with Quizlet and memorize flashcards containing terms like Since wood is an organic material, it is subject to mildew and rot unless it is adequately protected from moisture- True or False?, What is the minimum bevel allowed for a splice in a wood wing spar?, When patching a plywood skin, abrupt changes in cross directional areas which will develop dangerous stress Aircraft wood is cut from a log "quarter sawn", which means that the end of the board should show the growth rings near vertically across the thickness of the board assuming that your board is wider than it is thick. glassjet. Ultimately, with either one, it comes down to how the airplane has been cared for. Orders for spars, spruce kits and capstrip can usually be shipped within three weeks after receipt of order. Note that I rounded up to the next whole number to determine the number of 1/8th inch plys. Oct What is the correct repair to a wooden aircraft wing spar if the wing-attach bolt holes in the spar are elongated? Splice in a new section of the spar and drill new holes. $37. AIRCRAFT MECHANIC REVIEWER PHILIPPINES Laminated wood This morning we took the inspection covers off my wood spar J-3 for the annual. Looking at 43. I did a search for “FAR’s for wood spar inspection and damage repair” and came up with the attached image as a part of the 46 page FAA publication. Bargain Bag Of Spruce. Fabric underside from front spar back. All exposed end grain wood, particularly the spar butts, should be inspected for cracking or checking. B) a new section of spar should be spliced in or the spar replaced entirely. And remember, the deeper the spar, the more load it will carry. The web is usually 1/8” balsa. Aircraft Wood and Structural Repair. 6-13. The FAA noted that a redesigned wing spar assembly is available from Piper, as well as a reinforcing kit that can be installed on many newer PA–28s including the Cherokee, Warrior, Archer, and Piper Pilot models Study with Quizlet and memorize flashcards containing terms like What is the danger of a wooden aircraft structure in which the wood holds a moisture content of over 20%? A. Wood aircraft have been safely doing aerobatics since the beginnings of aviation. Manufactured to Federal Specification FF-N-105 (formerly AN301). asharpe New Member. Although the spars are cut from a single slab, they can be laminated of two or more pieces when perfect spar blanks of the proper length and width are difficult to obtain. 90° grain runs with 8′ direction. warehouse. The landing gear of the Citabria is in a conventional arrangement. Wood Is subject to. WOOD STRUCTURE SECTION 1. The wing joiner is always aircraft grade plywood, the same thickness as the width of the flanges. We were told to take off and immediately climb to at least 200'. PORTER-CABLE 693LRPK 1-3/4 HP Fixed Ro Study with Quizlet and memorize flashcards containing terms like Laminated wood spars may be substituted for solid rectangular wood spars. Expansion and contraction of the structure components. I got an estimate of $4k to have it done. The upper spar cap will be in compression and the lower cap in tension; the lower cap is more critical regarding the likelihood of fatigue failure. Instead of using single "planks" for the top and bottom, I was planning to use wood strips glued together to form the caps. Dec 22, 2024 #2 Reactions: ironnerd. The new planes '90s onward are outside of my budget. Why metal spar wings? Study with Quizlet and memorize flashcards containing terms like Pin knot clusters are permitted in wood aircraft structure provided, Any wooden member that has been overstressed is subject to which type of failure?, A faint line running across the grain of a Aircraft spruce spars are available either S2S (surfaced 2 sides, top & bottom, with rough edges in 4" & 6" nominal width) or S4S (surfaced all 4 sides to thickness & width). The idea of building a simple, inexpensive wood airplane appealed to so many readers that hundreds of you (yes, hundreds!) wrote to the referenced sources for more information and plans . 75. docx from BSAEE 223 at Philippine State College of Aeronautics, Villamor Air Base, Pasay City (Main Campus). The main gear legs of most Citabrias are made of Hi All, I am building a wing for a Serenity (formerly Warner) "Spacewalker," which uses a boxed (partial) I-beam spar on the outer wings. Test your knowledge now! Repairing Aircraft Spar: Methods and Considerations. great to deal with even custom Both agreed that the spar fails the wing spar AD. My question involves the selection of lumber for the built-up (three layers) spar caps at the top and bottom of the outer spars. obtain uniform strength. 50. An article entitled "Why Not Build A Wood Airplane" appeared in the May 1991 issue of SPORT AVIATION. My experience has been that crummy airplanes have crummy wings, regardless of spar composition Douglas fir is the preferred choice of aircraft wood and its the standard by which al the other woods are measured. Most Citabrias were built with wooden spars. com. There are a couple very nice '70s wood spar aircraft available. Considered to be obsolete for all aircraft repairs. I am in the process of ordering new wood spars from Aircraft Spruce and the dimensions of my rear spar is smaller than what has been previously posted. Longitudinal Cracking of Wood Wing Spars of Aircraft Operating in Arid Regions. Aircraft Spruce The process to make the spar would be to cut strips of spruce maybe 3/8" thick. The wood used for repairs should match the original spar in type and size, and plywood webs should be reinforced with the same type of plywood. I bought a small stash of Sitka spar stock material and there are 4 boards suitable for full length J-3 front spars. increase Study with Quizlet and memorize flashcards containing terms like replacing portions that includes drain holes the repaired portion must, what is the most satisfactory method of making and end joints between two solid wood memebers, a spar can be spliced anywhere exept and more. Looks like the excess glue and varnish have detached from the spar face. When exposed to extremely dry, or extremely humid, conditions the surface layers of the plywood react rapidly by shedding Title: American Champion Aircraft Corporation 7, 8, and 11 Series Airplanes Date: July 13, 2001 Subject: Inspection of Wood Wing Spars OPEN PDF The spar is usually the first member located during the construction of the section, and the other components are fastened directly or indirectly to it. Reactions don't hit anything with your wingtip, and a wood spar will outlast the rest of the aircraft by a bunch! I am going to guess that a spar fails the inspection 6-13 AMA102 In cases of elongated bolt holes in a wood spar or cracks in the vicinity of bolt holes, A. When an I beam wooden spar has been routed, what is the purpose of this procedure?, Wood decay is detrimental to an aircraft structure therefore, it is if you have ANC-18 (which is a must for wood aircraft structures) I suggest that you read pages 36 and following for the stress analysis of wooden spar of composite structure. Expl = The only repair that is approved for an elongated bolt hole in a wood aircraft wing spar is to cut out the section of the spar that contains the damage and splice in a new section. Inspect structural members for compression failures, which is indicated by rupture across the wood fibers. This blog is written to be more like a web based magazine and I would like to think that any blog entry on here could be published in a magazine. The previous owner decided to do a direct substitution of the wood spars in the Wag Aero Sport Trainer plans with metal spars leaving all of the compression struts and lift strut fittings the same but shimmed out with aluminum billet to the correct dimensions. We're happy to help! 6-13 AMA102 In cases of elongated bolt holes in a wood spar or cracks in the vicinity of bolt holes, A. Wooden spars were fabricated from spruce in many airplanes along with ribs and need a finished 6" spar for your aircraft the supplier may have difficulty providing that dimension. $961. The metal one comes with a slight gross weight increase (100 lbs), so I guess you'd say it's a bit "stronger" since they carry the same aerobatic rating. The spar carries flight loads and the weight of the wings while on the ground. It’s the least expensive option, but it might be false economy. Quality of Wood. Compression failure. Wooden aircraft are more prone to the damaging effects of water, especially without the protection of covered storage. A good indication of moisture, fungal growth, and possible _____ is a _____ or _____ odor. B. I’m exploring options, and here’s what I’ve found so far. Slope of the grain C. A faint line running across the grain of a wood spar generally indicates. Wood Products Shop Now. Hysol EA-9430 Glue (2 Lb) $159. Spars for certificated aircraft such as Aeronca, Stearman, Taylorcraft and Piper are available and may be priced from the if you have ANC-18 (which is a must for wood aircraft structures) I suggest that you read pages 36 and following for the stress analysis of wooden spar of composite structure. So for example, for a 5 inch high spar only ~3 3/8" of vertical grain is required to be acceptable as a solid spar in a a. Study with Quizlet and memorize flashcards containing terms like Which statement about wood decay is correct a) Decay that occurs before the wood is seasoned does not affect the strength of the finished place b) A limited amount of certain kinds of decay is acceptable in aircraft woods since decay affects the binding between the fibers and not the fibers themselves c) Decay is Dear Reader, The Writings of Jon blog features my many and varied interests such as science fiction, aviation, military history, and beekeeping. Control system openings, fastener holes, cracks or breaks in the inish, and the interfaces of metal ittings and the In France, the company "Robin" still manufactures these wooden devices (which allows payloads from 700 to 800 Kg for a 200 hp), they have even developed a new wood-carbon spar for the two-seater CAP 10 (derived from Study with Quizlet and memorize flashcards containing terms like Laminated wood is sometimes used in the construction of highly stressed aircraft components. Inspect aircraft wood structure or wood sample (Level 3) AC43. My experience has been that crummy airplanes have crummy wings, regardless of spar composition This morning we took the inspection covers off my wood spar J-3 for the annual. reduce weight. Certainly, the type of glue used in wood construction is of the utmost importance. Replace just the one defective wood spar. Study with Quizlet and memorize flashcards containing terms like Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface, The I-beam wooden spar is routed to?, When patching a plywood skin, abrupt changes in cross-sectional areas which will develop dangerous stress concentration should be avoided by Do any of y'all know of a plane that uses wood truss ribs on an aluminum I-beam spar? T. Used to probe a suspected area of rot. How do you determine if there is damage ?, Delaminating and deboning in a composite structures can be the best wood IMHO is sitka spruce aircraft grade best of luck with that B Last edited by Boston; 11-01-2009, 01:24 AM. General Table 1-1. Compression failures are indicated by ruptures across the wood fibers. Satisfactory glue joints in aircraft should develop the full strength of the wood under all conditions of stress. Picture trying to replace a rectangular wood beam with an I-beam. Shopping Tools. 8. Casein Glues. The parts just do not mate properly for an item important to the structure of the aircraft. Wood-Products_Spruce_SPRUCE-SPAR-STOCK. Use your old bushings. increase What is the correct repair to a wooden aircraft wing spar if the wing-attach bolt holes in the spar are elongated? remove the section containing the elongated hole and splice in a new section or replace the entire spar. fnhhvvrcaynalxghffcyuzugxovyhevucegbqembsgmtxjtkpcwnonlnom