ARF Wing Repair

EPAIR U Don Brooks ONE OF THE skills serious RC pilot needs ability repair severely damaged wingeven Almost Ready Fly ARF model dont like build sooner later will still need know repair wing model No model flown frequently maintains its pristine newlybuilt beauty some attention modeler may very well experience event leaves model good wing wing thats shatteredas recently happened Heres repair tbat broken wing return Almost Ready Fly model its original beauty flyability procedure would also work kit-built wing Im AMA Introductory Pilot Instructor student future AMA member brought newly assembled Tiger Trainer 40 ARF field flight instruction See Analysis Crash page 33 process trying keep airplane running off runway took control bit late managed impale students airplane irrigation stake pretty sight left wing panel erupted shower balsa covering pieces airplane spun around ugly yellow stake sticking out top remains left wing quick survey showed damage included smashed broken leading edge broken top bottom spar members third rib bay out center wing trailing edge appeared undamaged So wing repair job damage often looks lot worse really So dont lose heart completed wing repair five easy steps Step Expose Damage first step remove plastic covering left wing also removed top side center-section balsa sheeting leading edge sheeting gain access damaged parts internal wing step essential expose cracked sheeting broken pieces 20 Model Aviation left wing spars survived crash reattached help stabilize wing shape allow further repair/replacement parts Making replacement rib pattern salvaged portions ribs damaged crash Ribs cut two easier replacement four ribs required wing stucture need reglued replaced rebuilding objective restore wing original strength beauty no weight gain dont just double up broken pieces reinforce cut out replace broken pieces cannot just reglued Throughout step careful put little stress trailing edge possible extra care top bottom sheeting trailing edge cracked repaired remains left wing panel mainly held right wing left-wing aileron Damage assessment crash smashed leading edge over two rib bays broken top bottom spars four broken partly missing wing ribs smashed leading edge center section bottom sheeting cracked trailing edge sheeting removed damaged sheeting Some parts sheeting salvaged later removed loose rib pieces smashed sections leading edge Step Two Stabilize Wing Dimensions Since ARF no plan rebuild wing So necessary preserve wing outline able fill broken structure left wing very fragile point repair still connected trailing edge needed some other part frame reconnected temporarily make wing strong enough handle during detailed repair leading edge smashed broken several sections top bottom spars broken cleanly no missing pieces So spar would temporary reconnection strengthen wing preserve correct shape wing panel wing completely separated step would involve measuring propping up good wing building board pinning remnants damaged wing building board make appropriately sized outline work reconnecting structures right wing propped up appropriate angle left wing panel pieces lay flat building board pinned left wing pieces board butted top bottom spar pieces together reconnected temporarily using baking soda cyanoacrylate CyA glue baking soda sets up like brick thin CyA applied combination works very well kind repair Caution sure use adequate ventilation during process left wing panel still pinned down cut away damaged crushed ends leading edge break razor saw cuts made 450 angle wood grain gap leading edge wider toward front glued backing piece balsa behind leading edge gap roughly two-inch overlap end leading edge material cut sanded ends April 1999 21 Bottom sheeting replaced Leading edge filled wedge-shaped balsa carved rough shape Angle cuts leading edge sheeting strengthen joints Ribs replaced half-rib sections sanded fit Shear webbing added rib bays 2 3 Leading edge sanded shape center sheeting added Recovered wing ready flight could tell wing collision White MonoKote used panel colored MonoKote trim Seal edges CyA wider piece a fit partially fill beveled gap leading edge glued place CyA filled small gaps baking soda CyA Step Three Rebuilding Wing Spar leading trailing edges now strong enough hold wing shape made permanent spar repair removed wing building board cut top bottom spars just outboard temporarily repaired break roughly 300 angleshallow enough generate long surface along splice cuts made crossing pattern splice top spar approximately 900 angle splice bottom spar important maximum strength carefully pried top bottom spar pieces free wing center joiner collision broken epoxy joints associated center joiner including tied top bottom spar members wing center joiner spar pieces come free easily would have used hot-air gun soften epoxy could work center pieces free Now could see wing center joiner constructed joiner consisted aluminum piece laminated between two pieces plywood metal piece drilled lightening holes collision delaminated pieces bent metal piece joiner backward None metal plywood pieces center joiner broken speaks well wing joiner design straightened metal seetion cut off damaged seetion inboard original top bottom spar pieees match angled cut made earlier using 30minute epoxy plenty working time relaminated wing center joiner glued top bottom spar splices together glued spar members wing center joiner clamped whole affair several small C-clamps vises set up overnight top bottom spars ended up about inch short center wing No problem plenty gluing surface along top wing center joiner Apples oranges. its like compar- enhancing dual ball bearings about ing Magnum other brands engines same price plain bearing engines Magnum offers much value Compare Magnums reliability model engineyoullperformance choice Compare .andchoosein air easyDual needle Comparevalve carbs Magnum sand precisionSchneurle CNC ma-porting give chine workyou high ef jewel-like finish other brands ficiency broad tuning ability quality see goes way beyond skin Magnum gives everything deep Unlike so-called ABC en- want glow powered engine price gines actually nickel plated can easily afford isnt what Magnums ABC engines have true hard youre really looking chrome plated cylinders longest life See Magnum engines local XL Series engines have performance dealer Distributed Global Hobby Distributors lt4tt tandilier Circle Fountain Valley CA 9272t-ttlt Glabol Hobby Distributoro April 1999 23 THERE ARE BEES AND THERE ARE BEES. SOME ARE LAZY OURS ARE GEE.. tASEnCiw IJ SPAN 415 LENGTH 27 WEIGHT 30 LB. AREA 320 SOIN PRICE $6499CHANNELS 4 WP FOR ADDITIONAL INFORMATION ON ALL OUR OFFERINGS SEND SASETOwwwhobbyhangarcom ROLLED PLANSHOBBY1862 PETERSBURG ROADph 6063344331 COMPLETE HARDWARE PACKAGEHANCAR HEBRON KY 41048Ordersonly 8006113660 DESIGNED BY ADRIAN PAGE remaining spar pieces one-inch gaps filled balsa prior final sanding panel spar-to-center-joiner joint least strong original joint Step Four Filling Missing Structures next challenge creating replacement ribs broken needed four ribs parts thereof Using remains several ribs measured dimension wing chord pieced together rib pattern paper made cardboard template rib pattern cut four replacement ribs 3A2 balsa ribs would cut half spar location installed forward rear half-rib sections removed rest top center section sheeting damaged wing make rib repair easier Using CyA glued small pieces /32 plywood inside top bottom trailing edges reinforce cracked balsa After spar joints sanded smooth bridged spar joint inside surface spars fiberglass cloth CyAjust little insurance splices Prior reinstalling ribs replaced bottom sheeting completed rest leading edge wing cut sanded pieces sheeting fit pinned wing building board again wingtip blocked up /8 inch washout trailing edge high installed bottom sheeting remaining new wedge balsa leading edge cut joining bottom leading edge sheeting made 450 angle wood grain strength joint wing still pinned building board sanded fit ribs filled replaced broken incomplete ribs replacement top center section sheeting also partially completed ready replace fill out leading edge sheeting top wing Installation leading edge sheeting stiffens wing significantly Its important have wing pinned down blocked up wingtip correct amount washout before gluing top leading edge sheeting Some block-sanding may needed ensure top forward part ribs Beep language means. Bees ee Im hear call us 24 Model Aviation TON RETRIEVAL SYSTEMS 725 Cooper Lake Rd SE Smyrna GA 30082 770-434-4905 800-657-4672 Fax 770-431 -0119 Visa AmEx e-mail WalstonRET@aolcom sheeting will attached same height cut off damaged portion top leading edge sheeting 450 angle wood grain reinstalled undamaged portion sheeting using CyA little baking soda fill hairline cracks get CyA down junction between sheeting rib punched pinholes along top sheeting above rib applied CyA holes holding sheeting tight against top rib glued reinforcing piece balsa underneath end sheeting would join new sheeting strengthened smoothed joint leading edge sheeting provided gluing surface new sheeting replaced remainder leading edge center section sheeting applying sheeting over curved surface like forward center section wetting outside balsa will cause wood swell side will help shape balsa curve much bending pressure technique useful particularly balsa bit hard removed wing building board sanded exposed wing structures preparation recovering Step Five Recovering Wing unique thing about recovering wing concemed sealing new MonoKote covering original covering material plastic shrink covering used manufacturer low-temperature low-tension material hard get MonoKote hot enough stick scorching original material overiapped finally resort use CyA seal edge MonoKote original covering used white MonoKote cover whole wing panel cut MonoKote red yellow orange decoration pieces ironed place Outlining edges color boundaries /16 trim tape completed wing decoration have found tacking trim tape ends droplet CyA helps keep place hope dont get wing-repair business too often damage ARF wing dont have buy another prefabricated wing whole new ARF model estimate repair cost about $10 material glue about 7-8 hours time workshop ready flying weekend after accident Brooks 900 Bower Dr Idaho Falls ID 83404 Sources Tiger Trainer 40 Thunder Tiger USA 2430 Lacey Ln #120 Carrollton TX 75006 MonoKote sold Top Elite through various distributors hobby shops April 1999 27 Balsa Building Board smooth surface excelient pining ppts place gjuing together Pieces cut cross grain end wood grain makes up surfhce allows multiple cuts ace crumbling Board slightly flexible Price includes S & H MT residents add 6% sales tax will conform table topSorry no orders outside continental U S LY1ICO734-434-8928 DGVF41A@Prodigy corn PO Box 178Check money Milan MI 48160order only

EPAIR U Don Brooks ONE OF THE skills serious RC pilot needs ability repair severely damaged wingeven Almost Ready Fly ARF model dont like build sooner later will still need know repair wing model No model flown frequently maintains its pristine newlybuilt beauty some attention modeler may very well experience event leaves model good wing wing thats shatteredas recently happened Heres repair tbat broken wing return Almost Ready Fly model its original beauty flyability procedure would also work kit-built wing Im AMA Introductory Pilot Instructor student future AMA member brought newly assembled Tiger Trainer 40 ARF field flight instruction See Analysis Crash page 33 process trying keep airplane running off runway took control bit late managed impale students airplane irrigation stake pretty sight left wing panel erupted shower balsa covering pieces airplane spun around ugly yellow stake sticking out top remains left wing quick survey showed damage included smashed broken leading edge broken top bottom spar members third rib bay out center wing trailing edge appeared undamaged So wing repair job damage often looks lot worse really So dont lose heart completed wing repair five easy steps Step Expose Damage first step remove plastic covering left wing also removed top side center-section balsa sheeting leading edge sheeting gain access damaged parts internal wing step essential expose cracked sheeting broken pieces 20 Model Aviation left wing spars survived crash reattached help stabilize wing shape allow further repair/replacement parts Making replacement rib pattern salvaged portions ribs damaged crash Ribs cut two easier replacement four ribs required wing stucture need reglued replaced rebuilding objective restore wing original strength beauty no weight gain dont just double up broken pieces reinforce cut out replace broken pieces cannot just reglued Throughout step careful put little stress trailing edge possible extra care top bottom sheeting trailing edge cracked repaired remains left wing panel mainly held right wing left-wing aileron Damage assessment crash smashed leading edge over two rib bays broken top bottom spars four broken partly missing wing ribs smashed leading edge center section bottom sheeting cracked trailing edge sheeting removed damaged sheeting Some parts sheeting salvaged later removed loose rib pieces smashed sections leading edge Step Two Stabilize Wing Dimensions Since ARF no plan rebuild wing So necessary preserve wing outline able fill broken structure left wing very fragile point repair still connected trailing edge needed some other part frame reconnected temporarily make wing strong enough handle during detailed repair leading edge smashed broken several sections top bottom spars broken cleanly no missing pieces So spar would temporary reconnection strengthen wing preserve correct shape wing panel wing completely separated step would involve measuring propping up good wing building board pinning remnants damaged wing building board make appropriately sized outline work reconnecting structures right wing propped up appropriate angle left wing panel pieces lay flat building board pinned left wing pieces board butted top bottom spar pieces together reconnected temporarily using baking soda cyanoacrylate CyA glue baking soda sets up like brick thin CyA applied combination works very well kind repair Caution sure use adequate ventilation during process left wing panel still pinned down cut away damaged crushed ends leading edge break razor saw cuts made 450 angle wood grain gap leading edge wider toward front glued backing piece balsa behind leading edge gap roughly two-inch overlap end leading edge material cut sanded ends April 1999 21 Bottom sheeting replaced Leading edge filled wedge-shaped balsa carved rough shape Angle cuts leading edge sheeting strengthen joints Ribs replaced half-rib sections sanded fit Shear webbing added rib bays 2 3 Leading edge sanded shape center sheeting added Recovered wing ready flight could tell wing collision White MonoKote used panel colored MonoKote trim Seal edges CyA wider piece a fit partially fill beveled gap leading edge glued place CyA filled small gaps baking soda CyA Step Three Rebuilding Wing Spar leading trailing edges now strong enough hold wing shape made permanent spar repair removed wing building board cut top bottom spars just outboard temporarily repaired break roughly 300 angleshallow enough generate long surface along splice cuts made crossing pattern splice top spar approximately 900 angle splice bottom spar important maximum strength carefully pried top bottom spar pieces free wing center joiner collision broken epoxy joints associated center joiner including tied top bottom spar members wing center joiner spar pieces come free easily would have used hot-air gun soften epoxy could work center pieces free Now could see wing center joiner constructed joiner consisted aluminum piece laminated between two pieces plywood metal piece drilled lightening holes collision delaminated pieces bent metal piece joiner backward None metal plywood pieces center joiner broken speaks well wing joiner design straightened metal seetion cut off damaged seetion inboard original top bottom spar pieees match angled cut made earlier using 30minute epoxy plenty working time relaminated wing center joiner glued top bottom spar splices together glued spar members wing center joiner clamped whole affair several small C-clamps vises set up overnight top bottom spars ended up about inch short center wing No problem plenty gluing surface along top wing center joiner Apples oranges. its like compar- enhancing dual ball bearings about ing Magnum other brands engines same price plain bearing engines Magnum offers much value Compare Magnums reliability model engineyoullperformance choice Compare .andchoosein air easyDual needle Comparevalve carbs Magnum sand precisionSchneurle CNC ma-porting give chine workyou high ef jewel-like finish other brands ficiency broad tuning ability quality see goes way beyond skin Magnum gives everything deep Unlike so-called ABC en- want glow powered engine price gines actually nickel plated can easily afford isnt what Magnums ABC engines have true hard youre really looking chrome plated cylinders longest life See Magnum engines local XL Series engines have performance dealer Distributed Global Hobby Distributors lt4tt tandilier Circle Fountain Valley CA 9272t-ttlt Glabol Hobby Distributoro April 1999 23 THERE ARE BEES AND THERE ARE BEES. SOME ARE LAZY OURS ARE GEE.. tASEnCiw IJ SPAN 415 LENGTH 27 WEIGHT 30 LB. AREA 320 SOIN PRICE $6499CHANNELS 4 WP FOR ADDITIONAL INFORMATION ON ALL OUR OFFERINGS SEND SASETOwwwhobbyhangarcom ROLLED PLANSHOBBY1862 PETERSBURG ROADph 6063344331 COMPLETE HARDWARE PACKAGEHANCAR HEBRON KY 41048Ordersonly 8006113660 DESIGNED BY ADRIAN PAGE remaining spar pieces one-inch gaps filled balsa prior final sanding panel spar-to-center-joiner joint least strong original joint Step Four Filling Missing Structures next challenge creating replacement ribs broken needed four ribs parts thereof Using remains several ribs measured dimension wing chord pieced together rib pattern paper made cardboard template rib pattern cut four replacement ribs 3A2 balsa ribs would cut half spar location installed forward rear half-rib sections removed rest top center section sheeting damaged wing make rib repair easier Using CyA glued small pieces /32 plywood inside top bottom trailing edges reinforce cracked balsa After spar joints sanded smooth bridged spar joint inside surface spars fiberglass cloth CyAjust little insurance splices Prior reinstalling ribs replaced bottom sheeting completed rest leading edge wing cut sanded pieces sheeting fit pinned wing building board again wingtip blocked up /8 inch washout trailing edge high installed bottom sheeting remaining new wedge balsa leading edge cut joining bottom leading edge sheeting made 450 angle wood grain strength joint wing still pinned building board sanded fit ribs filled replaced broken incomplete ribs replacement top center section sheeting also partially completed ready replace fill out leading edge sheeting top wing Installation leading edge sheeting stiffens wing significantly Its important have wing pinned down blocked up wingtip correct amount washout before gluing top leading edge sheeting Some block-sanding may needed ensure top forward part ribs Beep language means. Bees ee Im hear call us 24 Model Aviation TON RETRIEVAL SYSTEMS 725 Cooper Lake Rd SE Smyrna GA 30082 770-434-4905 800-657-4672 Fax 770-431 -0119 Visa AmEx e-mail WalstonRET@aolcom sheeting will attached same height cut off damaged portion top leading edge sheeting 450 angle wood grain reinstalled undamaged portion sheeting using CyA little baking soda fill hairline cracks get CyA down junction between sheeting rib punched pinholes along top sheeting above rib applied CyA holes holding sheeting tight against top rib glued reinforcing piece balsa underneath end sheeting would join new sheeting strengthened smoothed joint leading edge sheeting provided gluing surface new sheeting replaced remainder leading edge center section sheeting applying sheeting over curved surface like forward center section wetting outside balsa will cause wood swell side will help shape balsa curve much bending pressure technique useful particularly balsa bit hard removed wing building board sanded exposed wing structures preparation recovering Step Five Recovering Wing unique thing about recovering wing concemed sealing new MonoKote covering original covering material plastic shrink covering used manufacturer low-temperature low-tension material hard get MonoKote hot enough stick scorching original material overiapped finally resort use CyA seal edge MonoKote original covering used white MonoKote cover whole wing panel cut MonoKote red yellow orange decoration pieces ironed place Outlining edges color boundaries /16 trim tape completed wing decoration have found tacking trim tape ends droplet CyA helps keep place hope dont get wing-repair business too often damage ARF wing dont have buy another prefabricated wing whole new ARF model estimate repair cost about $10 material glue about 7-8 hours time workshop ready flying weekend after accident Brooks 900 Bower Dr Idaho Falls ID 83404 Sources Tiger Trainer 40 Thunder Tiger USA 2430 Lacey Ln #120 Carrollton TX 75006 MonoKote sold Top Elite through various distributors hobby shops April 1999 27 Balsa Building Board smooth surface excelient pining ppts place gjuing together Pieces cut cross grain end wood grain makes up surfhce allows multiple cuts ace crumbling Board slightly flexible Price includes S & H MT residents add 6% sales tax will conform table topSorry no orders outside continental U S LY1ICO734-434-8928 DGVF41A@Prodigy corn PO Box 178Check money Milan MI 48160order only