FREE FLIGHT DURATION U LAST MONTH talked about some basics carbon-fiber CF construction time well delve little farther specifics quick recap two main types carbon fiber used wing construction woven cloth unidirectional strip Woven carbon cloth similar fiberglass cloth course black color Unfortunately available weights weaves carbon fiber cloth much limited Perhaps useful Free Flight purposes 29-ounce plain-weave cloth Lighter carbon cloths available can very very expensive Like fiberglass cloth carbon-fiber cloth limp pliable always used combination epoxy resin form produce rigid molded shell such D-box cloth can cut easily sharp scissors Unidirectional strip rigid sheet strip carbon fiber Carbon-fiber strip available like balsa various thicknesses widths lengths Thicknesses range 00l-060 inch thinner strips 001-003 used primarily rib capstrips Thicker strips 007-042 used spar caps thickest strips 030060 used trailing edges Carbon strip up about 014 can cut easily sharp knife single-edge razor blade much like stripping balsa Thicker carbon best cut Dremel cutoff wheel other abrasive-type saw blade Since suitable saw ripping carbon strips can bit trouble expense set up easier use ready-cut carbonfiber spar trailing edge pieces strip own Often spar sets sold four matching tapered carbon-fiber pieces upper lower spar cap wing half Unidirectional carbon strip requires some surface preparation assure good glue bond Sand surface lightly fine sandpaper remove gloss wipe surface lacquer thinner remove fine dust much easier to whole sheet individual strips typical carbon-fiber D-box wing structure consists spar carries bending load D-box shell carries torsional load aft ribs little support covering back trailing edge Lets look Spar CF D-box structure spar full-depth usually located about 25% chord lightly-loaded structure small model main tip spar medium-size stab spar could consist simple 1/16 inch sheet balsa spar highly stressed models pair carbon spar caps added top bottom balsa Rohacell foam web between help reduce weight tips spar caps indeed entire spar usually tapered plan view Wakefield F1J wing spar might taper about wide wing center less A6 inch tip coincides reduction bending load wing center tip spar typically made gluing lower CF spar cap slightly wider sheet balsa foam will form web web sanded desired thickness upper CF spar cap glued place making sure lines up exactly lower cap After glue hardens excess web carved sanded away leaving rectangular cross-section spar Note thickness finished spar will need somewhat less total desired wing thickness allow thickness D-box skins wing covering thread spar wrap Under high flight loads tendency CF spar cap inside bend separate web good glue joint will help maximum strength entire spar often wrapped TYPICAL MODERN Fl B WING 15mm Balsa Ribs D-Box Rear Section Typical Rear Rib Spacing 25mm 40mm Pitch 03 x 15mm Carbon Cap Strips Top Bottompar Wrapped Overlapped 25mm over D-Box KTrailing Kevlar Thread 35mm x 5mm Tapering 35mm x 3mm carbon 7mm x 25mm Carbon Trailing EdgeMolded Carbon Epoxy & Micro Machined Aluminum Socket Joiner l Carbon 6mm Balsa Root Rib 2mm x 35mm Carbon Leading Edge Molded Carbon Fiber Kevlar D-Box February 1998 123 thin Keviar thread avoid cutting thread sharp edges corners spar rounded off slightly sandpaper end thread attached drop cyanoacrylate CyA end spar thread spiralwrapped around spar thread should closely spaced near wing center spacing gradually opening up move out careful introduce twist spar wrapping far end simply tack thread place will allow compress slightly later D-box skin glued place As alternative thread wrapping some people use CF sock slipped over spar pulled tight Another option glue piece D-box material back side spar Although doesnt help much thread-wrapping usually adequate smaller less highly stressed models D-box As mentioned earlier widely-used material CF D-box skins 29ounce plain-weave carbon cloth maximum torsional strength used threads 450 bias-cut sewing parlance Heres quick run-down what involved form consists piece basswood least inch wider desired D-box width approximately desired wing thickness should three four inches longer longest wing panel FlB wings use two-inch-wide piece basswood 24 inches long edge basswood planed sanded approximate shape first 15% airfoil Note leading edge radius should slightly sharper desired finished wing allow thickness D-box skin basswood glued 1 x 2 strip ood leading edge basswood form stands up really no need finish wax form few coats nonshrinking dope wont hurt form covered single layer plastic kitchen wrap Try smooth out wrinkles Cut piece CF cloth slightly oversize lay sheet waxed paper one-inch-wide x 18-inch-long D-box start piece cloth about three x 20 inchesremember D-box will wrap top spar around leading edge back bottom spar As gain experience can decrease size carbon cloth slightly reduce waste Next mix up batch laminating resin such West Systems epoxy pour over carbon cloth Use squeegee work cloth Blot kitchen paper towels dont use cheap ones until towels come up dry Carefully pick up wetted-out cloth drape over form wearing rubber gloves arent Position piece Teflon-coated fiberglass cloth over carbon cloth Teflon-coated cloth should slightly larger carbon cloth helps use few small pieces masking tape hold position form Add clean piece kitchen towel over everything Top off plastic kitchen wrap over whole mess Insert vacuum bag seal 124 Model Aviation irfoil-shaped basswood form used Simple jig supports D-box trailing mold D-box skin carbon cloth edge alignment rectangular ribs Rudder form finished product shown glued place Ready cover Minimal structure needed using carbon fiber Weave cloth 450 maximum torsional strength Stab has tapered D-box CF-faced Vie balsa spar Aft ribs areStab TE carbon fiber 1A balsa end rib capped top Vie balsa capped 002 carbon fiberbottom carbon fiber prevents distortion covering bag turn pump As bag deflates will pull down tightly over form Excess epoxy resin will wick through Teflon-coated fiberglass cloth absorbed paper towel Allow pump run least six hours wait least 24 hours before removing bag sounds too complicatedand really isntyou can order ready-made CF D-box shells several sources However plan make few models having own vacuum pump bag will offer considerable savings Its good item club group purchase share typical vacuum-bagging setup consists bag heavy plastic about size shape large pillowcase hose connects vacuum pump item bagged simply slipped open end bag bag sealed pump turned sure use purpose-made vacuum pump will pull least 20 inches mercury under continuous operation can add vacuum gauge line check pressure After epoxy has cured remove plastic wrapping etc careful bend shell remove form Before can attach shell spar will need add front ribs spar Typically 1A6 balsa spaced about 15-20 mm apart spar-rib assembly often referred fishbone because its appearance light models leading edge usually used Sometimes thin strip carbon used leading edge reinforcement carbon inserted slots front ribs Another alternative use narrow balsa leading edge much hold ribs place during construction actual strength purpose After fishbone ready shell should trial-fitted over Mark trim shell overlaps back spar slightly can trim shell sharp knife straightedge Sand inside shell better adhesion use sandpaper wrapped over form Wipe lacquer thinner Coat spar ribs slow-curing epoxy glue blot off excess actually time-consuming fiddly part building D-box Ive best luck using small fine-textured sponge apply epoxy Insert fishbone shell cover plastic wrap place flat surface Use rubber bands masking tape hold shell down tight against ribs spar until epoxy sets After glue dries unwrap finished D-box sand excess shell off back sides main structural part wing finished Aft Ribs Trailing Edge Position completed D-box undercambered building board hold down masking tape rubber bands weights pin through D-box can however use pins along front rear help locate D-box carbon-fiber trailing edge should positioned next add balsa ribs usual manner using CyA epoxy Remove almost-finished wing building board carefully sand bottom Because trailing edges small cross-section rib-to-trailing-edge joint prone breakage stage careful keep CyA handy Strip off plentiful supply rib caps thin 001 003 carbon sheet Ive found easiest way cut sheet approximate length spar trailing edge distance plus about 1/2 inch strip off individual capstrips can make simple stripper single-edge razor blade two pieces scrap /i6 plywood can simply eyeball Another alternative use ready-made rib caps available several mail-order sources Start gluing caps place bottom wing caps should start about /e inch forward rear D box extend past trailing edge easiest way apply gap-filling CyA capstrip place position smooth down finger covered plastic wrap After bottom caps place trim excess cap material simply breaking off Sand top wing smooth add upper caps should done wing panel strapped down undercambered building board Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts / Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight AircrafL.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAI Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS tNC 909AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstametcom D & J ELECTRONICS Marigold St NW Hartville OH 44632 1236330-877-1445 hi ice & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzers Endors.d AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPS Mail WIM w W Visit home page http//wwwdnjeIectromcscom Email damd@dnjeIectronicscom jayne@dnielectronics AMA #256123ARRLWB8YSQ IT-BAR SANDERI 2 RIBS FOR EASIER HANDUNG 2 1/2 WIDE ALUMINUM EXTRUSION GREAT FOR SAND ING WING RIBS FUSELAGES AND BOAT HULLS ABRASIVE ROLLS PRESS-ON 7 YDS 2 112 WIDE JUST PEEL AND STICK ON T BAR SANDER OR ANY OTHER SANDING BLOCK 900 THE MINI DRILL cue12 DRILLS 52 TO 74 STORED IN PIN VISE 1ST QUALITY IORED ET CLIP HIGH SPEED STEEL L1____ NO 378 ____ $600 SET MICROCASSETTE SELF STARTING BLOW TORCH TORCH WORKS WITH ORDINARY OIGAREITE UGHTER 2300FtI300C PERFECT PIN-POINT FLME ONOFF SE1Y SWITCHj -WINDPROOF SELF STARlING BY PUSHING BUTTONa MT 772 WILIGHTER $800 EAS1ERH TOOL & SUPPLY CO 149 GRAND STREET NEW YORK CITY NY 10013 WHEN ORDERING PPD ADD $650 ADD $950 ORDERS 212-925-1006FAX 212-925-1010 Catalee $200 Free order accept Visa/MD warps build will stay no holding over teakettle carbon structures Since wing gets its strength carbon structure covering can use lightest plastic films covering information carbon D-box wing construction recommend Notes High-Tech Wing Construction Aram Schlosberg 1995 Symposium Report Quicker Composite Structures Chris Edge Mike Fantham British Free Flight Forum 1995 Both publications can ordered NFFS Publications 4858 Moorpark Ave San Jose CA 95129 Another useful publication also available NFFS NFFS International Planbook includes several articles construction well numerous three-view drawings models have never tried building carbon fiber urge give try results stronger stiffer consistent ever possible conventional balsa-and-tissue methods CF Stabs & Rudders Although some people suggest building FiB stabs rudders carbon fiber structural overkill sure nice have tail surfaces absolutely warp Building time actually less conventional all-balsa structures weights comparable Strength stiffness however CF D-box tails incredibly strong last few years Rex Hinson have collaborating Wakefield design construction Usually takes form us calling other claims new lighter better construction method stab shown photos version Rexs latest stab tapered planform effort reduce weight decreasing width D-box toward tips Construction follows standard methods outlined above except special tapered form carved followed swept-back shape desired D-box decided better keep trailing edge straight sweep back D-box Note center inch stab straight better fit against stab mount Molding carbon-fiber shell required bit pulling tugging get wetted out carbon cloth lay smoothly over form Teflon-coated glass cloth cut two center would conform swept-back shape After shell cured trimmed exact shape tapering about 3/e inch center about tips balsa center rib added rib extends about inch rear suit particular stab mounting system stab hammer comes up through middle stab stab overhangs rear tailboom about 1 inches 126 Model Aviation al mounting system stab hammer rear center rib could extend way rear spars stripped /16 balsa has CF cloth epoxied side vacuum-bagged full-depth spars taper about 5A2 center about /s tip spars glued place butting up against center rib soft balsa rib fitted tip no other ribs D-box rest structure consists carbon-fiber trailing edge /16 ribs end ribs 1/g balsa prevent rib bending inward after stab covered ribs capped 002 carbon fiber 28 sq din stabs come out around 32 35 grams uncovered rudder made much same way speed construction have made simple jig hold finished D-box trailing edge alignment Ribs simply rectangular pieces A6 x a After glued place rudder removed jig sanded symmetrical airfoil shape carbon rib caps added both sides problem far bottom rib effort save weight went too far bottom rib bending inward tension quarter mil Mylar covering Later rudders use inch lower rib wider carbon caps on Fiber Sources Composite Structures Technology carbon cloth strip epoxy vacuum pumps Teflon-coated glass cloth bagging supplies etc Box 642 Tehachapi CA 93581 Tel 805 822-4162 Web page wwwtminetcomlcstl Bradley Model Supply carbon strip spar sets 1337 Pine Sap Ct Orlando FL 32825 Starline International spar sets D-box shells 6146 B Cactus Wren Rd Scottsdale AZ 85253 Tel 602 948-5798 http/wwwstarln@ aolcom A-B-C Free Eight Supplies spar sets D-box shells Melis Jos Winterbeekstraat 1 3730 Hoeselt Belgium E-mail JosMelis@pingbe T-ON OWEN LESS HASSLE MORE FUN Dieselize wit/i Davis Diesel Its Awesome 1s4 C N DAVIS MODIL PRO 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 35cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 C-OPC 11cc Stock Tun Joe Monohan Other contests nationwide Numerous awards year FHS Supply lncPO Box 9CloverSC 29710-0009 Sales800 742-8484Voice 803 222-7488 lnternetFHSoiI@aolcom Fax803 222-7285 httoIlmembersaolcomlFHSoillRedMaxhtml Up Away' Sounds familiar doesnt Happens too frequently. increase chances finding lost model Call us Now WALSTON RETRIEVAL SYSTEMS 725 Ceoper Lake Rd SE Smyrna GA 30082 770-434-4905 900-657-4672 Fax 770-431-0119 Visa AmEx VIDEO $995 APPLIES TO PURCHASE PRICE OF KIT KIT $265 PLANS $3500 MUD DUCK AVIATION 7118 Westmoreland Dr Warrenton VA 20187 540 347-1134 FebrUary 1998 127 14 50% Power Same Easy Starting No Glow Plugs Runs llvice Long Scale Sound P0 Box 141 Dept MA ord CT 06460 877 o complete inrmotion pocket send $400 Icredit 0F tulates Kirk Cray excellent ver Scperformance AMA 1st Place FHS Winners 803liii World Chain AMA Air NationalsUsing spaceage lubrication tecnology rop 1997 112A CombatFHS Oil Bob Mearsquality components developed refined over 1996 FAI Pattern Kirk Gray28 years experience RED MAX fuels 1996 Sportsman Randy Wolfespecially engineered Maximum Performance IMAC Scale Acrobatic NationalsPower Protection RED MAX known 1997 Sportsman Michael Kupersold internationally best fuel can IRCHA Helicooter Internationalsuse model engine Fuel model types available planes helicopters boats cars--racing pattern just fun Engine types 2 4 cycle Glow Diesel Nitro Power blends 0% 75% 5% Oil blends RED MAX Synthetic Syn-Cas Blend Customer special blends available Minimum gal Standard 4-gal 20-qt Cases Shipping UPS door 12 gal motorfreight commercial address Price breaks 4 12 20 60124 gal Special discount prepaid club orders RED MAX Shirts Hats & Stickers available See giant FLY thee L
Edition: Model Aviation - 1998/02
Page Numbers: 123, 124, 125, 126, 127
FREE FLIGHT DURATION U LAST MONTH talked about some basics carbon-fiber CF construction time well delve little farther specifics quick recap two main types carbon fiber used wing construction woven cloth unidirectional strip Woven carbon cloth similar fiberglass cloth course black color Unfortunately available weights weaves carbon fiber cloth much limited Perhaps useful Free Flight purposes 29-ounce plain-weave cloth Lighter carbon cloths available can very very expensive Like fiberglass cloth carbon-fiber cloth limp pliable always used combination epoxy resin form produce rigid molded shell such D-box cloth can cut easily sharp scissors Unidirectional strip rigid sheet strip carbon fiber Carbon-fiber strip available like balsa various thicknesses widths lengths Thicknesses range 00l-060 inch thinner strips 001-003 used primarily rib capstrips Thicker strips 007-042 used spar caps thickest strips 030060 used trailing edges Carbon strip up about 014 can cut easily sharp knife single-edge razor blade much like stripping balsa Thicker carbon best cut Dremel cutoff wheel other abrasive-type saw blade Since suitable saw ripping carbon strips can bit trouble expense set up easier use ready-cut carbonfiber spar trailing edge pieces strip own Often spar sets sold four matching tapered carbon-fiber pieces upper lower spar cap wing half Unidirectional carbon strip requires some surface preparation assure good glue bond Sand surface lightly fine sandpaper remove gloss wipe surface lacquer thinner remove fine dust much easier to whole sheet individual strips typical carbon-fiber D-box wing structure consists spar carries bending load D-box shell carries torsional load aft ribs little support covering back trailing edge Lets look Spar CF D-box structure spar full-depth usually located about 25% chord lightly-loaded structure small model main tip spar medium-size stab spar could consist simple 1/16 inch sheet balsa spar highly stressed models pair carbon spar caps added top bottom balsa Rohacell foam web between help reduce weight tips spar caps indeed entire spar usually tapered plan view Wakefield F1J wing spar might taper about wide wing center less A6 inch tip coincides reduction bending load wing center tip spar typically made gluing lower CF spar cap slightly wider sheet balsa foam will form web web sanded desired thickness upper CF spar cap glued place making sure lines up exactly lower cap After glue hardens excess web carved sanded away leaving rectangular cross-section spar Note thickness finished spar will need somewhat less total desired wing thickness allow thickness D-box skins wing covering thread spar wrap Under high flight loads tendency CF spar cap inside bend separate web good glue joint will help maximum strength entire spar often wrapped TYPICAL MODERN Fl B WING 15mm Balsa Ribs D-Box Rear Section Typical Rear Rib Spacing 25mm 40mm Pitch 03 x 15mm Carbon Cap Strips Top Bottompar Wrapped Overlapped 25mm over D-Box KTrailing Kevlar Thread 35mm x 5mm Tapering 35mm x 3mm carbon 7mm x 25mm Carbon Trailing EdgeMolded Carbon Epoxy & Micro Machined Aluminum Socket Joiner l Carbon 6mm Balsa Root Rib 2mm x 35mm Carbon Leading Edge Molded Carbon Fiber Kevlar D-Box February 1998 123 thin Keviar thread avoid cutting thread sharp edges corners spar rounded off slightly sandpaper end thread attached drop cyanoacrylate CyA end spar thread spiralwrapped around spar thread should closely spaced near wing center spacing gradually opening up move out careful introduce twist spar wrapping far end simply tack thread place will allow compress slightly later D-box skin glued place As alternative thread wrapping some people use CF sock slipped over spar pulled tight Another option glue piece D-box material back side spar Although doesnt help much thread-wrapping usually adequate smaller less highly stressed models D-box As mentioned earlier widely-used material CF D-box skins 29ounce plain-weave carbon cloth maximum torsional strength used threads 450 bias-cut sewing parlance Heres quick run-down what involved form consists piece basswood least inch wider desired D-box width approximately desired wing thickness should three four inches longer longest wing panel FlB wings use two-inch-wide piece basswood 24 inches long edge basswood planed sanded approximate shape first 15% airfoil Note leading edge radius should slightly sharper desired finished wing allow thickness D-box skin basswood glued 1 x 2 strip ood leading edge basswood form stands up really no need finish wax form few coats nonshrinking dope wont hurt form covered single layer plastic kitchen wrap Try smooth out wrinkles Cut piece CF cloth slightly oversize lay sheet waxed paper one-inch-wide x 18-inch-long D-box start piece cloth about three x 20 inchesremember D-box will wrap top spar around leading edge back bottom spar As gain experience can decrease size carbon cloth slightly reduce waste Next mix up batch laminating resin such West Systems epoxy pour over carbon cloth Use squeegee work cloth Blot kitchen paper towels dont use cheap ones until towels come up dry Carefully pick up wetted-out cloth drape over form wearing rubber gloves arent Position piece Teflon-coated fiberglass cloth over carbon cloth Teflon-coated cloth should slightly larger carbon cloth helps use few small pieces masking tape hold position form Add clean piece kitchen towel over everything Top off plastic kitchen wrap over whole mess Insert vacuum bag seal 124 Model Aviation irfoil-shaped basswood form used Simple jig supports D-box trailing mold D-box skin carbon cloth edge alignment rectangular ribs Rudder form finished product shown glued place Ready cover Minimal structure needed using carbon fiber Weave cloth 450 maximum torsional strength Stab has tapered D-box CF-faced Vie balsa spar Aft ribs areStab TE carbon fiber 1A balsa end rib capped top Vie balsa capped 002 carbon fiberbottom carbon fiber prevents distortion covering bag turn pump As bag deflates will pull down tightly over form Excess epoxy resin will wick through Teflon-coated fiberglass cloth absorbed paper towel Allow pump run least six hours wait least 24 hours before removing bag sounds too complicatedand really isntyou can order ready-made CF D-box shells several sources However plan make few models having own vacuum pump bag will offer considerable savings Its good item club group purchase share typical vacuum-bagging setup consists bag heavy plastic about size shape large pillowcase hose connects vacuum pump item bagged simply slipped open end bag bag sealed pump turned sure use purpose-made vacuum pump will pull least 20 inches mercury under continuous operation can add vacuum gauge line check pressure After epoxy has cured remove plastic wrapping etc careful bend shell remove form Before can attach shell spar will need add front ribs spar Typically 1A6 balsa spaced about 15-20 mm apart spar-rib assembly often referred fishbone because its appearance light models leading edge usually used Sometimes thin strip carbon used leading edge reinforcement carbon inserted slots front ribs Another alternative use narrow balsa leading edge much hold ribs place during construction actual strength purpose After fishbone ready shell should trial-fitted over Mark trim shell overlaps back spar slightly can trim shell sharp knife straightedge Sand inside shell better adhesion use sandpaper wrapped over form Wipe lacquer thinner Coat spar ribs slow-curing epoxy glue blot off excess actually time-consuming fiddly part building D-box Ive best luck using small fine-textured sponge apply epoxy Insert fishbone shell cover plastic wrap place flat surface Use rubber bands masking tape hold shell down tight against ribs spar until epoxy sets After glue dries unwrap finished D-box sand excess shell off back sides main structural part wing finished Aft Ribs Trailing Edge Position completed D-box undercambered building board hold down masking tape rubber bands weights pin through D-box can however use pins along front rear help locate D-box carbon-fiber trailing edge should positioned next add balsa ribs usual manner using CyA epoxy Remove almost-finished wing building board carefully sand bottom Because trailing edges small cross-section rib-to-trailing-edge joint prone breakage stage careful keep CyA handy Strip off plentiful supply rib caps thin 001 003 carbon sheet Ive found easiest way cut sheet approximate length spar trailing edge distance plus about 1/2 inch strip off individual capstrips can make simple stripper single-edge razor blade two pieces scrap /i6 plywood can simply eyeball Another alternative use ready-made rib caps available several mail-order sources Start gluing caps place bottom wing caps should start about /e inch forward rear D box extend past trailing edge easiest way apply gap-filling CyA capstrip place position smooth down finger covered plastic wrap After bottom caps place trim excess cap material simply breaking off Sand top wing smooth add upper caps should done wing panel strapped down undercambered building board Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts / Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight AircrafL.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAI Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS tNC 909AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstametcom D & J ELECTRONICS Marigold St NW Hartville OH 44632 1236330-877-1445 hi ice & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzers Endors.d AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPS Mail WIM w W Visit home page http//wwwdnjeIectromcscom Email damd@dnjeIectronicscom jayne@dnielectronics AMA #256123ARRLWB8YSQ IT-BAR SANDERI 2 RIBS FOR EASIER HANDUNG 2 1/2 WIDE ALUMINUM EXTRUSION GREAT FOR SAND ING WING RIBS FUSELAGES AND BOAT HULLS ABRASIVE ROLLS PRESS-ON 7 YDS 2 112 WIDE JUST PEEL AND STICK ON T BAR SANDER OR ANY OTHER SANDING BLOCK 900 THE MINI DRILL cue12 DRILLS 52 TO 74 STORED IN PIN VISE 1ST QUALITY IORED ET CLIP HIGH SPEED STEEL L1____ NO 378 ____ $600 SET MICROCASSETTE SELF STARTING BLOW TORCH TORCH WORKS WITH ORDINARY OIGAREITE UGHTER 2300FtI300C PERFECT PIN-POINT FLME ONOFF SE1Y SWITCHj -WINDPROOF SELF STARlING BY PUSHING BUTTONa MT 772 WILIGHTER $800 EAS1ERH TOOL & SUPPLY CO 149 GRAND STREET NEW YORK CITY NY 10013 WHEN ORDERING PPD ADD $650 ADD $950 ORDERS 212-925-1006FAX 212-925-1010 Catalee $200 Free order accept Visa/MD warps build will stay no holding over teakettle carbon structures Since wing gets its strength carbon structure covering can use lightest plastic films covering information carbon D-box wing construction recommend Notes High-Tech Wing Construction Aram Schlosberg 1995 Symposium Report Quicker Composite Structures Chris Edge Mike Fantham British Free Flight Forum 1995 Both publications can ordered NFFS Publications 4858 Moorpark Ave San Jose CA 95129 Another useful publication also available NFFS NFFS International Planbook includes several articles construction well numerous three-view drawings models have never tried building carbon fiber urge give try results stronger stiffer consistent ever possible conventional balsa-and-tissue methods CF Stabs & Rudders Although some people suggest building FiB stabs rudders carbon fiber structural overkill sure nice have tail surfaces absolutely warp Building time actually less conventional all-balsa structures weights comparable Strength stiffness however CF D-box tails incredibly strong last few years Rex Hinson have collaborating Wakefield design construction Usually takes form us calling other claims new lighter better construction method stab shown photos version Rexs latest stab tapered planform effort reduce weight decreasing width D-box toward tips Construction follows standard methods outlined above except special tapered form carved followed swept-back shape desired D-box decided better keep trailing edge straight sweep back D-box Note center inch stab straight better fit against stab mount Molding carbon-fiber shell required bit pulling tugging get wetted out carbon cloth lay smoothly over form Teflon-coated glass cloth cut two center would conform swept-back shape After shell cured trimmed exact shape tapering about 3/e inch center about tips balsa center rib added rib extends about inch rear suit particular stab mounting system stab hammer comes up through middle stab stab overhangs rear tailboom about 1 inches 126 Model Aviation al mounting system stab hammer rear center rib could extend way rear spars stripped /16 balsa has CF cloth epoxied side vacuum-bagged full-depth spars taper about 5A2 center about /s tip spars glued place butting up against center rib soft balsa rib fitted tip no other ribs D-box rest structure consists carbon-fiber trailing edge /16 ribs end ribs 1/g balsa prevent rib bending inward after stab covered ribs capped 002 carbon fiber 28 sq din stabs come out around 32 35 grams uncovered rudder made much same way speed construction have made simple jig hold finished D-box trailing edge alignment Ribs simply rectangular pieces A6 x a After glued place rudder removed jig sanded symmetrical airfoil shape carbon rib caps added both sides problem far bottom rib effort save weight went too far bottom rib bending inward tension quarter mil Mylar covering Later rudders use inch lower rib wider carbon caps on Fiber Sources Composite Structures Technology carbon cloth strip epoxy vacuum pumps Teflon-coated glass cloth bagging supplies etc Box 642 Tehachapi CA 93581 Tel 805 822-4162 Web page wwwtminetcomlcstl Bradley Model Supply carbon strip spar sets 1337 Pine Sap Ct Orlando FL 32825 Starline International spar sets D-box shells 6146 B Cactus Wren Rd Scottsdale AZ 85253 Tel 602 948-5798 http/wwwstarln@ aolcom A-B-C Free Eight Supplies spar sets D-box shells Melis Jos Winterbeekstraat 1 3730 Hoeselt Belgium E-mail JosMelis@pingbe T-ON OWEN LESS HASSLE MORE FUN Dieselize wit/i Davis Diesel Its Awesome 1s4 C N DAVIS MODIL PRO 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 35cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 C-OPC 11cc Stock Tun Joe Monohan Other contests nationwide Numerous awards year FHS Supply lncPO Box 9CloverSC 29710-0009 Sales800 742-8484Voice 803 222-7488 lnternetFHSoiI@aolcom Fax803 222-7285 httoIlmembersaolcomlFHSoillRedMaxhtml Up Away' Sounds familiar doesnt Happens too frequently. increase chances finding lost model Call us Now WALSTON RETRIEVAL SYSTEMS 725 Ceoper Lake Rd SE Smyrna GA 30082 770-434-4905 900-657-4672 Fax 770-431-0119 Visa AmEx VIDEO $995 APPLIES TO PURCHASE PRICE OF KIT KIT $265 PLANS $3500 MUD DUCK AVIATION 7118 Westmoreland Dr Warrenton VA 20187 540 347-1134 FebrUary 1998 127 14 50% Power Same Easy Starting No Glow Plugs Runs llvice Long Scale Sound P0 Box 141 Dept MA ord CT 06460 877 o complete inrmotion pocket send $400 Icredit 0F tulates Kirk Cray excellent ver Scperformance AMA 1st Place FHS Winners 803liii World Chain AMA Air NationalsUsing spaceage lubrication tecnology rop 1997 112A CombatFHS Oil Bob Mearsquality components developed refined over 1996 FAI Pattern Kirk Gray28 years experience RED MAX fuels 1996 Sportsman Randy Wolfespecially engineered Maximum Performance IMAC Scale Acrobatic NationalsPower Protection RED MAX known 1997 Sportsman Michael Kupersold internationally best fuel can IRCHA Helicooter Internationalsuse model engine Fuel model types available planes helicopters boats cars--racing pattern just fun Engine types 2 4 cycle Glow Diesel Nitro Power blends 0% 75% 5% Oil blends RED MAX Synthetic Syn-Cas Blend Customer special blends available Minimum gal Standard 4-gal 20-qt Cases Shipping UPS door 12 gal motorfreight commercial address Price breaks 4 12 20 60124 gal Special discount prepaid club orders RED MAX Shirts Hats & Stickers available See giant FLY thee L
Edition: Model Aviation - 1998/02
Page Numbers: 123, 124, 125, 126, 127
FREE FLIGHT DURATION U LAST MONTH talked about some basics carbon-fiber CF construction time well delve little farther specifics quick recap two main types carbon fiber used wing construction woven cloth unidirectional strip Woven carbon cloth similar fiberglass cloth course black color Unfortunately available weights weaves carbon fiber cloth much limited Perhaps useful Free Flight purposes 29-ounce plain-weave cloth Lighter carbon cloths available can very very expensive Like fiberglass cloth carbon-fiber cloth limp pliable always used combination epoxy resin form produce rigid molded shell such D-box cloth can cut easily sharp scissors Unidirectional strip rigid sheet strip carbon fiber Carbon-fiber strip available like balsa various thicknesses widths lengths Thicknesses range 00l-060 inch thinner strips 001-003 used primarily rib capstrips Thicker strips 007-042 used spar caps thickest strips 030060 used trailing edges Carbon strip up about 014 can cut easily sharp knife single-edge razor blade much like stripping balsa Thicker carbon best cut Dremel cutoff wheel other abrasive-type saw blade Since suitable saw ripping carbon strips can bit trouble expense set up easier use ready-cut carbonfiber spar trailing edge pieces strip own Often spar sets sold four matching tapered carbon-fiber pieces upper lower spar cap wing half Unidirectional carbon strip requires some surface preparation assure good glue bond Sand surface lightly fine sandpaper remove gloss wipe surface lacquer thinner remove fine dust much easier to whole sheet individual strips typical carbon-fiber D-box wing structure consists spar carries bending load D-box shell carries torsional load aft ribs little support covering back trailing edge Lets look Spar CF D-box structure spar full-depth usually located about 25% chord lightly-loaded structure small model main tip spar medium-size stab spar could consist simple 1/16 inch sheet balsa spar highly stressed models pair carbon spar caps added top bottom balsa Rohacell foam web between help reduce weight tips spar caps indeed entire spar usually tapered plan view Wakefield F1J wing spar might taper about wide wing center less A6 inch tip coincides reduction bending load wing center tip spar typically made gluing lower CF spar cap slightly wider sheet balsa foam will form web web sanded desired thickness upper CF spar cap glued place making sure lines up exactly lower cap After glue hardens excess web carved sanded away leaving rectangular cross-section spar Note thickness finished spar will need somewhat less total desired wing thickness allow thickness D-box skins wing covering thread spar wrap Under high flight loads tendency CF spar cap inside bend separate web good glue joint will help maximum strength entire spar often wrapped TYPICAL MODERN Fl B WING 15mm Balsa Ribs D-Box Rear Section Typical Rear Rib Spacing 25mm 40mm Pitch 03 x 15mm Carbon Cap Strips Top Bottompar Wrapped Overlapped 25mm over D-Box KTrailing Kevlar Thread 35mm x 5mm Tapering 35mm x 3mm carbon 7mm x 25mm Carbon Trailing EdgeMolded Carbon Epoxy & Micro Machined Aluminum Socket Joiner l Carbon 6mm Balsa Root Rib 2mm x 35mm Carbon Leading Edge Molded Carbon Fiber Kevlar D-Box February 1998 123 thin Keviar thread avoid cutting thread sharp edges corners spar rounded off slightly sandpaper end thread attached drop cyanoacrylate CyA end spar thread spiralwrapped around spar thread should closely spaced near wing center spacing gradually opening up move out careful introduce twist spar wrapping far end simply tack thread place will allow compress slightly later D-box skin glued place As alternative thread wrapping some people use CF sock slipped over spar pulled tight Another option glue piece D-box material back side spar Although doesnt help much thread-wrapping usually adequate smaller less highly stressed models D-box As mentioned earlier widely-used material CF D-box skins 29ounce plain-weave carbon cloth maximum torsional strength used threads 450 bias-cut sewing parlance Heres quick run-down what involved form consists piece basswood least inch wider desired D-box width approximately desired wing thickness should three four inches longer longest wing panel FlB wings use two-inch-wide piece basswood 24 inches long edge basswood planed sanded approximate shape first 15% airfoil Note leading edge radius should slightly sharper desired finished wing allow thickness D-box skin basswood glued 1 x 2 strip ood leading edge basswood form stands up really no need finish wax form few coats nonshrinking dope wont hurt form covered single layer plastic kitchen wrap Try smooth out wrinkles Cut piece CF cloth slightly oversize lay sheet waxed paper one-inch-wide x 18-inch-long D-box start piece cloth about three x 20 inchesremember D-box will wrap top spar around leading edge back bottom spar As gain experience can decrease size carbon cloth slightly reduce waste Next mix up batch laminating resin such West Systems epoxy pour over carbon cloth Use squeegee work cloth Blot kitchen paper towels dont use cheap ones until towels come up dry Carefully pick up wetted-out cloth drape over form wearing rubber gloves arent Position piece Teflon-coated fiberglass cloth over carbon cloth Teflon-coated cloth should slightly larger carbon cloth helps use few small pieces masking tape hold position form Add clean piece kitchen towel over everything Top off plastic kitchen wrap over whole mess Insert vacuum bag seal 124 Model Aviation irfoil-shaped basswood form used Simple jig supports D-box trailing mold D-box skin carbon cloth edge alignment rectangular ribs Rudder form finished product shown glued place Ready cover Minimal structure needed using carbon fiber Weave cloth 450 maximum torsional strength Stab has tapered D-box CF-faced Vie balsa spar Aft ribs areStab TE carbon fiber 1A balsa end rib capped top Vie balsa capped 002 carbon fiberbottom carbon fiber prevents distortion covering bag turn pump As bag deflates will pull down tightly over form Excess epoxy resin will wick through Teflon-coated fiberglass cloth absorbed paper towel Allow pump run least six hours wait least 24 hours before removing bag sounds too complicatedand really isntyou can order ready-made CF D-box shells several sources However plan make few models having own vacuum pump bag will offer considerable savings Its good item club group purchase share typical vacuum-bagging setup consists bag heavy plastic about size shape large pillowcase hose connects vacuum pump item bagged simply slipped open end bag bag sealed pump turned sure use purpose-made vacuum pump will pull least 20 inches mercury under continuous operation can add vacuum gauge line check pressure After epoxy has cured remove plastic wrapping etc careful bend shell remove form Before can attach shell spar will need add front ribs spar Typically 1A6 balsa spaced about 15-20 mm apart spar-rib assembly often referred fishbone because its appearance light models leading edge usually used Sometimes thin strip carbon used leading edge reinforcement carbon inserted slots front ribs Another alternative use narrow balsa leading edge much hold ribs place during construction actual strength purpose After fishbone ready shell should trial-fitted over Mark trim shell overlaps back spar slightly can trim shell sharp knife straightedge Sand inside shell better adhesion use sandpaper wrapped over form Wipe lacquer thinner Coat spar ribs slow-curing epoxy glue blot off excess actually time-consuming fiddly part building D-box Ive best luck using small fine-textured sponge apply epoxy Insert fishbone shell cover plastic wrap place flat surface Use rubber bands masking tape hold shell down tight against ribs spar until epoxy sets After glue dries unwrap finished D-box sand excess shell off back sides main structural part wing finished Aft Ribs Trailing Edge Position completed D-box undercambered building board hold down masking tape rubber bands weights pin through D-box can however use pins along front rear help locate D-box carbon-fiber trailing edge should positioned next add balsa ribs usual manner using CyA epoxy Remove almost-finished wing building board carefully sand bottom Because trailing edges small cross-section rib-to-trailing-edge joint prone breakage stage careful keep CyA handy Strip off plentiful supply rib caps thin 001 003 carbon sheet Ive found easiest way cut sheet approximate length spar trailing edge distance plus about 1/2 inch strip off individual capstrips can make simple stripper single-edge razor blade two pieces scrap /i6 plywood can simply eyeball Another alternative use ready-made rib caps available several mail-order sources Start gluing caps place bottom wing caps should start about /e inch forward rear D box extend past trailing edge easiest way apply gap-filling CyA capstrip place position smooth down finger covered plastic wrap After bottom caps place trim excess cap material simply breaking off Sand top wing smooth add upper caps should done wing panel strapped down undercambered building board Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts / Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight AircrafL.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAI Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS tNC 909AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstametcom D & J ELECTRONICS Marigold St NW Hartville OH 44632 1236330-877-1445 hi ice & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzers Endors.d AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPS Mail WIM w W Visit home page http//wwwdnjeIectromcscom Email damd@dnjeIectronicscom jayne@dnielectronics AMA #256123ARRLWB8YSQ IT-BAR SANDERI 2 RIBS FOR EASIER HANDUNG 2 1/2 WIDE ALUMINUM EXTRUSION GREAT FOR SAND ING WING RIBS FUSELAGES AND BOAT HULLS ABRASIVE ROLLS PRESS-ON 7 YDS 2 112 WIDE JUST PEEL AND STICK ON T BAR SANDER OR ANY OTHER SANDING BLOCK 900 THE MINI DRILL cue12 DRILLS 52 TO 74 STORED IN PIN VISE 1ST QUALITY IORED ET CLIP HIGH SPEED STEEL L1____ NO 378 ____ $600 SET MICROCASSETTE SELF STARTING BLOW TORCH TORCH WORKS WITH ORDINARY OIGAREITE UGHTER 2300FtI300C PERFECT PIN-POINT FLME ONOFF SE1Y SWITCHj -WINDPROOF SELF STARlING BY PUSHING BUTTONa MT 772 WILIGHTER $800 EAS1ERH TOOL & SUPPLY CO 149 GRAND STREET NEW YORK CITY NY 10013 WHEN ORDERING PPD ADD $650 ADD $950 ORDERS 212-925-1006FAX 212-925-1010 Catalee $200 Free order accept Visa/MD warps build will stay no holding over teakettle carbon structures Since wing gets its strength carbon structure covering can use lightest plastic films covering information carbon D-box wing construction recommend Notes High-Tech Wing Construction Aram Schlosberg 1995 Symposium Report Quicker Composite Structures Chris Edge Mike Fantham British Free Flight Forum 1995 Both publications can ordered NFFS Publications 4858 Moorpark Ave San Jose CA 95129 Another useful publication also available NFFS NFFS International Planbook includes several articles construction well numerous three-view drawings models have never tried building carbon fiber urge give try results stronger stiffer consistent ever possible conventional balsa-and-tissue methods CF Stabs & Rudders Although some people suggest building FiB stabs rudders carbon fiber structural overkill sure nice have tail surfaces absolutely warp Building time actually less conventional all-balsa structures weights comparable Strength stiffness however CF D-box tails incredibly strong last few years Rex Hinson have collaborating Wakefield design construction Usually takes form us calling other claims new lighter better construction method stab shown photos version Rexs latest stab tapered planform effort reduce weight decreasing width D-box toward tips Construction follows standard methods outlined above except special tapered form carved followed swept-back shape desired D-box decided better keep trailing edge straight sweep back D-box Note center inch stab straight better fit against stab mount Molding carbon-fiber shell required bit pulling tugging get wetted out carbon cloth lay smoothly over form Teflon-coated glass cloth cut two center would conform swept-back shape After shell cured trimmed exact shape tapering about 3/e inch center about tips balsa center rib added rib extends about inch rear suit particular stab mounting system stab hammer comes up through middle stab stab overhangs rear tailboom about 1 inches 126 Model Aviation al mounting system stab hammer rear center rib could extend way rear spars stripped /16 balsa has CF cloth epoxied side vacuum-bagged full-depth spars taper about 5A2 center about /s tip spars glued place butting up against center rib soft balsa rib fitted tip no other ribs D-box rest structure consists carbon-fiber trailing edge /16 ribs end ribs 1/g balsa prevent rib bending inward after stab covered ribs capped 002 carbon fiber 28 sq din stabs come out around 32 35 grams uncovered rudder made much same way speed construction have made simple jig hold finished D-box trailing edge alignment Ribs simply rectangular pieces A6 x a After glued place rudder removed jig sanded symmetrical airfoil shape carbon rib caps added both sides problem far bottom rib effort save weight went too far bottom rib bending inward tension quarter mil Mylar covering Later rudders use inch lower rib wider carbon caps on Fiber Sources Composite Structures Technology carbon cloth strip epoxy vacuum pumps Teflon-coated glass cloth bagging supplies etc Box 642 Tehachapi CA 93581 Tel 805 822-4162 Web page wwwtminetcomlcstl Bradley Model Supply carbon strip spar sets 1337 Pine Sap Ct Orlando FL 32825 Starline International spar sets D-box shells 6146 B Cactus Wren Rd Scottsdale AZ 85253 Tel 602 948-5798 http/wwwstarln@ aolcom A-B-C Free Eight Supplies spar sets D-box shells Melis Jos Winterbeekstraat 1 3730 Hoeselt Belgium E-mail JosMelis@pingbe T-ON OWEN LESS HASSLE MORE FUN Dieselize wit/i Davis Diesel Its Awesome 1s4 C N DAVIS MODIL PRO 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 35cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 C-OPC 11cc Stock Tun Joe Monohan Other contests nationwide Numerous awards year FHS Supply lncPO Box 9CloverSC 29710-0009 Sales800 742-8484Voice 803 222-7488 lnternetFHSoiI@aolcom Fax803 222-7285 httoIlmembersaolcomlFHSoillRedMaxhtml Up Away' Sounds familiar doesnt Happens too frequently. increase chances finding lost model Call us Now WALSTON RETRIEVAL SYSTEMS 725 Ceoper Lake Rd SE Smyrna GA 30082 770-434-4905 900-657-4672 Fax 770-431-0119 Visa AmEx VIDEO $995 APPLIES TO PURCHASE PRICE OF KIT KIT $265 PLANS $3500 MUD DUCK AVIATION 7118 Westmoreland Dr Warrenton VA 20187 540 347-1134 FebrUary 1998 127 14 50% Power Same Easy Starting No Glow Plugs Runs llvice Long Scale Sound P0 Box 141 Dept MA ord CT 06460 877 o complete inrmotion pocket send $400 Icredit 0F tulates Kirk Cray excellent ver Scperformance AMA 1st Place FHS Winners 803liii World Chain AMA Air NationalsUsing spaceage lubrication tecnology rop 1997 112A CombatFHS Oil Bob Mearsquality components developed refined over 1996 FAI Pattern Kirk Gray28 years experience RED MAX fuels 1996 Sportsman Randy Wolfespecially engineered Maximum Performance IMAC Scale Acrobatic NationalsPower Protection RED MAX known 1997 Sportsman Michael Kupersold internationally best fuel can IRCHA Helicooter Internationalsuse model engine Fuel model types available planes helicopters boats cars--racing pattern just fun Engine types 2 4 cycle Glow Diesel Nitro Power blends 0% 75% 5% Oil blends RED MAX Synthetic Syn-Cas Blend Customer special blends available Minimum gal Standard 4-gal 20-qt Cases Shipping UPS door 12 gal motorfreight commercial address Price breaks 4 12 20 60124 gal Special discount prepaid club orders RED MAX Shirts Hats & Stickers available See giant FLY thee L
Edition: Model Aviation - 1998/02
Page Numbers: 123, 124, 125, 126, 127
FREE FLIGHT DURATION U LAST MONTH talked about some basics carbon-fiber CF construction time well delve little farther specifics quick recap two main types carbon fiber used wing construction woven cloth unidirectional strip Woven carbon cloth similar fiberglass cloth course black color Unfortunately available weights weaves carbon fiber cloth much limited Perhaps useful Free Flight purposes 29-ounce plain-weave cloth Lighter carbon cloths available can very very expensive Like fiberglass cloth carbon-fiber cloth limp pliable always used combination epoxy resin form produce rigid molded shell such D-box cloth can cut easily sharp scissors Unidirectional strip rigid sheet strip carbon fiber Carbon-fiber strip available like balsa various thicknesses widths lengths Thicknesses range 00l-060 inch thinner strips 001-003 used primarily rib capstrips Thicker strips 007-042 used spar caps thickest strips 030060 used trailing edges Carbon strip up about 014 can cut easily sharp knife single-edge razor blade much like stripping balsa Thicker carbon best cut Dremel cutoff wheel other abrasive-type saw blade Since suitable saw ripping carbon strips can bit trouble expense set up easier use ready-cut carbonfiber spar trailing edge pieces strip own Often spar sets sold four matching tapered carbon-fiber pieces upper lower spar cap wing half Unidirectional carbon strip requires some surface preparation assure good glue bond Sand surface lightly fine sandpaper remove gloss wipe surface lacquer thinner remove fine dust much easier to whole sheet individual strips typical carbon-fiber D-box wing structure consists spar carries bending load D-box shell carries torsional load aft ribs little support covering back trailing edge Lets look Spar CF D-box structure spar full-depth usually located about 25% chord lightly-loaded structure small model main tip spar medium-size stab spar could consist simple 1/16 inch sheet balsa spar highly stressed models pair carbon spar caps added top bottom balsa Rohacell foam web between help reduce weight tips spar caps indeed entire spar usually tapered plan view Wakefield F1J wing spar might taper about wide wing center less A6 inch tip coincides reduction bending load wing center tip spar typically made gluing lower CF spar cap slightly wider sheet balsa foam will form web web sanded desired thickness upper CF spar cap glued place making sure lines up exactly lower cap After glue hardens excess web carved sanded away leaving rectangular cross-section spar Note thickness finished spar will need somewhat less total desired wing thickness allow thickness D-box skins wing covering thread spar wrap Under high flight loads tendency CF spar cap inside bend separate web good glue joint will help maximum strength entire spar often wrapped TYPICAL MODERN Fl B WING 15mm Balsa Ribs D-Box Rear Section Typical Rear Rib Spacing 25mm 40mm Pitch 03 x 15mm Carbon Cap Strips Top Bottompar Wrapped Overlapped 25mm over D-Box KTrailing Kevlar Thread 35mm x 5mm Tapering 35mm x 3mm carbon 7mm x 25mm Carbon Trailing EdgeMolded Carbon Epoxy & Micro Machined Aluminum Socket Joiner l Carbon 6mm Balsa Root Rib 2mm x 35mm Carbon Leading Edge Molded Carbon Fiber Kevlar D-Box February 1998 123 thin Keviar thread avoid cutting thread sharp edges corners spar rounded off slightly sandpaper end thread attached drop cyanoacrylate CyA end spar thread spiralwrapped around spar thread should closely spaced near wing center spacing gradually opening up move out careful introduce twist spar wrapping far end simply tack thread place will allow compress slightly later D-box skin glued place As alternative thread wrapping some people use CF sock slipped over spar pulled tight Another option glue piece D-box material back side spar Although doesnt help much thread-wrapping usually adequate smaller less highly stressed models D-box As mentioned earlier widely-used material CF D-box skins 29ounce plain-weave carbon cloth maximum torsional strength used threads 450 bias-cut sewing parlance Heres quick run-down what involved form consists piece basswood least inch wider desired D-box width approximately desired wing thickness should three four inches longer longest wing panel FlB wings use two-inch-wide piece basswood 24 inches long edge basswood planed sanded approximate shape first 15% airfoil Note leading edge radius should slightly sharper desired finished wing allow thickness D-box skin basswood glued 1 x 2 strip ood leading edge basswood form stands up really no need finish wax form few coats nonshrinking dope wont hurt form covered single layer plastic kitchen wrap Try smooth out wrinkles Cut piece CF cloth slightly oversize lay sheet waxed paper one-inch-wide x 18-inch-long D-box start piece cloth about three x 20 inchesremember D-box will wrap top spar around leading edge back bottom spar As gain experience can decrease size carbon cloth slightly reduce waste Next mix up batch laminating resin such West Systems epoxy pour over carbon cloth Use squeegee work cloth Blot kitchen paper towels dont use cheap ones until towels come up dry Carefully pick up wetted-out cloth drape over form wearing rubber gloves arent Position piece Teflon-coated fiberglass cloth over carbon cloth Teflon-coated cloth should slightly larger carbon cloth helps use few small pieces masking tape hold position form Add clean piece kitchen towel over everything Top off plastic kitchen wrap over whole mess Insert vacuum bag seal 124 Model Aviation irfoil-shaped basswood form used Simple jig supports D-box trailing mold D-box skin carbon cloth edge alignment rectangular ribs Rudder form finished product shown glued place Ready cover Minimal structure needed using carbon fiber Weave cloth 450 maximum torsional strength Stab has tapered D-box CF-faced Vie balsa spar Aft ribs areStab TE carbon fiber 1A balsa end rib capped top Vie balsa capped 002 carbon fiberbottom carbon fiber prevents distortion covering bag turn pump As bag deflates will pull down tightly over form Excess epoxy resin will wick through Teflon-coated fiberglass cloth absorbed paper towel Allow pump run least six hours wait least 24 hours before removing bag sounds too complicatedand really isntyou can order ready-made CF D-box shells several sources However plan make few models having own vacuum pump bag will offer considerable savings Its good item club group purchase share typical vacuum-bagging setup consists bag heavy plastic about size shape large pillowcase hose connects vacuum pump item bagged simply slipped open end bag bag sealed pump turned sure use purpose-made vacuum pump will pull least 20 inches mercury under continuous operation can add vacuum gauge line check pressure After epoxy has cured remove plastic wrapping etc careful bend shell remove form Before can attach shell spar will need add front ribs spar Typically 1A6 balsa spaced about 15-20 mm apart spar-rib assembly often referred fishbone because its appearance light models leading edge usually used Sometimes thin strip carbon used leading edge reinforcement carbon inserted slots front ribs Another alternative use narrow balsa leading edge much hold ribs place during construction actual strength purpose After fishbone ready shell should trial-fitted over Mark trim shell overlaps back spar slightly can trim shell sharp knife straightedge Sand inside shell better adhesion use sandpaper wrapped over form Wipe lacquer thinner Coat spar ribs slow-curing epoxy glue blot off excess actually time-consuming fiddly part building D-box Ive best luck using small fine-textured sponge apply epoxy Insert fishbone shell cover plastic wrap place flat surface Use rubber bands masking tape hold shell down tight against ribs spar until epoxy sets After glue dries unwrap finished D-box sand excess shell off back sides main structural part wing finished Aft Ribs Trailing Edge Position completed D-box undercambered building board hold down masking tape rubber bands weights pin through D-box can however use pins along front rear help locate D-box carbon-fiber trailing edge should positioned next add balsa ribs usual manner using CyA epoxy Remove almost-finished wing building board carefully sand bottom Because trailing edges small cross-section rib-to-trailing-edge joint prone breakage stage careful keep CyA handy Strip off plentiful supply rib caps thin 001 003 carbon sheet Ive found easiest way cut sheet approximate length spar trailing edge distance plus about 1/2 inch strip off individual capstrips can make simple stripper single-edge razor blade two pieces scrap /i6 plywood can simply eyeball Another alternative use ready-made rib caps available several mail-order sources Start gluing caps place bottom wing caps should start about /e inch forward rear D box extend past trailing edge easiest way apply gap-filling CyA capstrip place position smooth down finger covered plastic wrap After bottom caps place trim excess cap material simply breaking off Sand top wing smooth add upper caps should done wing panel strapped down undercambered building board Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts / Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight AircrafL.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAI Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS tNC 909AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstametcom D & J ELECTRONICS Marigold St NW Hartville OH 44632 1236330-877-1445 hi ice & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzers Endors.d AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPS Mail WIM w W Visit home page http//wwwdnjeIectromcscom Email damd@dnjeIectronicscom jayne@dnielectronics AMA #256123ARRLWB8YSQ IT-BAR SANDERI 2 RIBS FOR EASIER HANDUNG 2 1/2 WIDE ALUMINUM EXTRUSION GREAT FOR SAND ING WING RIBS FUSELAGES AND BOAT HULLS ABRASIVE ROLLS PRESS-ON 7 YDS 2 112 WIDE JUST PEEL AND STICK ON T BAR SANDER OR ANY OTHER SANDING BLOCK 900 THE MINI DRILL cue12 DRILLS 52 TO 74 STORED IN PIN VISE 1ST QUALITY IORED ET CLIP HIGH SPEED STEEL L1____ NO 378 ____ $600 SET MICROCASSETTE SELF STARTING BLOW TORCH TORCH WORKS WITH ORDINARY OIGAREITE UGHTER 2300FtI300C PERFECT PIN-POINT FLME ONOFF SE1Y SWITCHj -WINDPROOF SELF STARlING BY PUSHING BUTTONa MT 772 WILIGHTER $800 EAS1ERH TOOL & SUPPLY CO 149 GRAND STREET NEW YORK CITY NY 10013 WHEN ORDERING PPD ADD $650 ADD $950 ORDERS 212-925-1006FAX 212-925-1010 Catalee $200 Free order accept Visa/MD warps build will stay no holding over teakettle carbon structures Since wing gets its strength carbon structure covering can use lightest plastic films covering information carbon D-box wing construction recommend Notes High-Tech Wing Construction Aram Schlosberg 1995 Symposium Report Quicker Composite Structures Chris Edge Mike Fantham British Free Flight Forum 1995 Both publications can ordered NFFS Publications 4858 Moorpark Ave San Jose CA 95129 Another useful publication also available NFFS NFFS International Planbook includes several articles construction well numerous three-view drawings models have never tried building carbon fiber urge give try results stronger stiffer consistent ever possible conventional balsa-and-tissue methods CF Stabs & Rudders Although some people suggest building FiB stabs rudders carbon fiber structural overkill sure nice have tail surfaces absolutely warp Building time actually less conventional all-balsa structures weights comparable Strength stiffness however CF D-box tails incredibly strong last few years Rex Hinson have collaborating Wakefield design construction Usually takes form us calling other claims new lighter better construction method stab shown photos version Rexs latest stab tapered planform effort reduce weight decreasing width D-box toward tips Construction follows standard methods outlined above except special tapered form carved followed swept-back shape desired D-box decided better keep trailing edge straight sweep back D-box Note center inch stab straight better fit against stab mount Molding carbon-fiber shell required bit pulling tugging get wetted out carbon cloth lay smoothly over form Teflon-coated glass cloth cut two center would conform swept-back shape After shell cured trimmed exact shape tapering about 3/e inch center about tips balsa center rib added rib extends about inch rear suit particular stab mounting system stab hammer comes up through middle stab stab overhangs rear tailboom about 1 inches 126 Model Aviation al mounting system stab hammer rear center rib could extend way rear spars stripped /16 balsa has CF cloth epoxied side vacuum-bagged full-depth spars taper about 5A2 center about /s tip spars glued place butting up against center rib soft balsa rib fitted tip no other ribs D-box rest structure consists carbon-fiber trailing edge /16 ribs end ribs 1/g balsa prevent rib bending inward after stab covered ribs capped 002 carbon fiber 28 sq din stabs come out around 32 35 grams uncovered rudder made much same way speed construction have made simple jig hold finished D-box trailing edge alignment Ribs simply rectangular pieces A6 x a After glued place rudder removed jig sanded symmetrical airfoil shape carbon rib caps added both sides problem far bottom rib effort save weight went too far bottom rib bending inward tension quarter mil Mylar covering Later rudders use inch lower rib wider carbon caps on Fiber Sources Composite Structures Technology carbon cloth strip epoxy vacuum pumps Teflon-coated glass cloth bagging supplies etc Box 642 Tehachapi CA 93581 Tel 805 822-4162 Web page wwwtminetcomlcstl Bradley Model Supply carbon strip spar sets 1337 Pine Sap Ct Orlando FL 32825 Starline International spar sets D-box shells 6146 B Cactus Wren Rd Scottsdale AZ 85253 Tel 602 948-5798 http/wwwstarln@ aolcom A-B-C Free Eight Supplies spar sets D-box shells Melis Jos Winterbeekstraat 1 3730 Hoeselt Belgium E-mail JosMelis@pingbe T-ON OWEN LESS HASSLE MORE FUN Dieselize wit/i Davis Diesel Its Awesome 1s4 C N DAVIS MODIL PRO 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 35cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 C-OPC 11cc Stock Tun Joe Monohan Other contests nationwide Numerous awards year FHS Supply lncPO Box 9CloverSC 29710-0009 Sales800 742-8484Voice 803 222-7488 lnternetFHSoiI@aolcom Fax803 222-7285 httoIlmembersaolcomlFHSoillRedMaxhtml Up Away' Sounds familiar doesnt Happens too frequently. increase chances finding lost model Call us Now WALSTON RETRIEVAL SYSTEMS 725 Ceoper Lake Rd SE Smyrna GA 30082 770-434-4905 900-657-4672 Fax 770-431-0119 Visa AmEx VIDEO $995 APPLIES TO PURCHASE PRICE OF KIT KIT $265 PLANS $3500 MUD DUCK AVIATION 7118 Westmoreland Dr Warrenton VA 20187 540 347-1134 FebrUary 1998 127 14 50% Power Same Easy Starting No Glow Plugs Runs llvice Long Scale Sound P0 Box 141 Dept MA ord CT 06460 877 o complete inrmotion pocket send $400 Icredit 0F tulates Kirk Cray excellent ver Scperformance AMA 1st Place FHS Winners 803liii World Chain AMA Air NationalsUsing spaceage lubrication tecnology rop 1997 112A CombatFHS Oil Bob Mearsquality components developed refined over 1996 FAI Pattern Kirk Gray28 years experience RED MAX fuels 1996 Sportsman Randy Wolfespecially engineered Maximum Performance IMAC Scale Acrobatic NationalsPower Protection RED MAX known 1997 Sportsman Michael Kupersold internationally best fuel can IRCHA Helicooter Internationalsuse model engine Fuel model types available planes helicopters boats cars--racing pattern just fun Engine types 2 4 cycle Glow Diesel Nitro Power blends 0% 75% 5% Oil blends RED MAX Synthetic Syn-Cas Blend Customer special blends available Minimum gal Standard 4-gal 20-qt Cases Shipping UPS door 12 gal motorfreight commercial address Price breaks 4 12 20 60124 gal Special discount prepaid club orders RED MAX Shirts Hats & Stickers available See giant FLY thee L
Edition: Model Aviation - 1998/02
Page Numbers: 123, 124, 125, 126, 127
FREE FLIGHT DURATION U LAST MONTH talked about some basics carbon-fiber CF construction time well delve little farther specifics quick recap two main types carbon fiber used wing construction woven cloth unidirectional strip Woven carbon cloth similar fiberglass cloth course black color Unfortunately available weights weaves carbon fiber cloth much limited Perhaps useful Free Flight purposes 29-ounce plain-weave cloth Lighter carbon cloths available can very very expensive Like fiberglass cloth carbon-fiber cloth limp pliable always used combination epoxy resin form produce rigid molded shell such D-box cloth can cut easily sharp scissors Unidirectional strip rigid sheet strip carbon fiber Carbon-fiber strip available like balsa various thicknesses widths lengths Thicknesses range 00l-060 inch thinner strips 001-003 used primarily rib capstrips Thicker strips 007-042 used spar caps thickest strips 030060 used trailing edges Carbon strip up about 014 can cut easily sharp knife single-edge razor blade much like stripping balsa Thicker carbon best cut Dremel cutoff wheel other abrasive-type saw blade Since suitable saw ripping carbon strips can bit trouble expense set up easier use ready-cut carbonfiber spar trailing edge pieces strip own Often spar sets sold four matching tapered carbon-fiber pieces upper lower spar cap wing half Unidirectional carbon strip requires some surface preparation assure good glue bond Sand surface lightly fine sandpaper remove gloss wipe surface lacquer thinner remove fine dust much easier to whole sheet individual strips typical carbon-fiber D-box wing structure consists spar carries bending load D-box shell carries torsional load aft ribs little support covering back trailing edge Lets look Spar CF D-box structure spar full-depth usually located about 25% chord lightly-loaded structure small model main tip spar medium-size stab spar could consist simple 1/16 inch sheet balsa spar highly stressed models pair carbon spar caps added top bottom balsa Rohacell foam web between help reduce weight tips spar caps indeed entire spar usually tapered plan view Wakefield F1J wing spar might taper about wide wing center less A6 inch tip coincides reduction bending load wing center tip spar typically made gluing lower CF spar cap slightly wider sheet balsa foam will form web web sanded desired thickness upper CF spar cap glued place making sure lines up exactly lower cap After glue hardens excess web carved sanded away leaving rectangular cross-section spar Note thickness finished spar will need somewhat less total desired wing thickness allow thickness D-box skins wing covering thread spar wrap Under high flight loads tendency CF spar cap inside bend separate web good glue joint will help maximum strength entire spar often wrapped TYPICAL MODERN Fl B WING 15mm Balsa Ribs D-Box Rear Section Typical Rear Rib Spacing 25mm 40mm Pitch 03 x 15mm Carbon Cap Strips Top Bottompar Wrapped Overlapped 25mm over D-Box KTrailing Kevlar Thread 35mm x 5mm Tapering 35mm x 3mm carbon 7mm x 25mm Carbon Trailing EdgeMolded Carbon Epoxy & Micro Machined Aluminum Socket Joiner l Carbon 6mm Balsa Root Rib 2mm x 35mm Carbon Leading Edge Molded Carbon Fiber Kevlar D-Box February 1998 123 thin Keviar thread avoid cutting thread sharp edges corners spar rounded off slightly sandpaper end thread attached drop cyanoacrylate CyA end spar thread spiralwrapped around spar thread should closely spaced near wing center spacing gradually opening up move out careful introduce twist spar wrapping far end simply tack thread place will allow compress slightly later D-box skin glued place As alternative thread wrapping some people use CF sock slipped over spar pulled tight Another option glue piece D-box material back side spar Although doesnt help much thread-wrapping usually adequate smaller less highly stressed models D-box As mentioned earlier widely-used material CF D-box skins 29ounce plain-weave carbon cloth maximum torsional strength used threads 450 bias-cut sewing parlance Heres quick run-down what involved form consists piece basswood least inch wider desired D-box width approximately desired wing thickness should three four inches longer longest wing panel FlB wings use two-inch-wide piece basswood 24 inches long edge basswood planed sanded approximate shape first 15% airfoil Note leading edge radius should slightly sharper desired finished wing allow thickness D-box skin basswood glued 1 x 2 strip ood leading edge basswood form stands up really no need finish wax form few coats nonshrinking dope wont hurt form covered single layer plastic kitchen wrap Try smooth out wrinkles Cut piece CF cloth slightly oversize lay sheet waxed paper one-inch-wide x 18-inch-long D-box start piece cloth about three x 20 inchesremember D-box will wrap top spar around leading edge back bottom spar As gain experience can decrease size carbon cloth slightly reduce waste Next mix up batch laminating resin such West Systems epoxy pour over carbon cloth Use squeegee work cloth Blot kitchen paper towels dont use cheap ones until towels come up dry Carefully pick up wetted-out cloth drape over form wearing rubber gloves arent Position piece Teflon-coated fiberglass cloth over carbon cloth Teflon-coated cloth should slightly larger carbon cloth helps use few small pieces masking tape hold position form Add clean piece kitchen towel over everything Top off plastic kitchen wrap over whole mess Insert vacuum bag seal 124 Model Aviation irfoil-shaped basswood form used Simple jig supports D-box trailing mold D-box skin carbon cloth edge alignment rectangular ribs Rudder form finished product shown glued place Ready cover Minimal structure needed using carbon fiber Weave cloth 450 maximum torsional strength Stab has tapered D-box CF-faced Vie balsa spar Aft ribs areStab TE carbon fiber 1A balsa end rib capped top Vie balsa capped 002 carbon fiberbottom carbon fiber prevents distortion covering bag turn pump As bag deflates will pull down tightly over form Excess epoxy resin will wick through Teflon-coated fiberglass cloth absorbed paper towel Allow pump run least six hours wait least 24 hours before removing bag sounds too complicatedand really isntyou can order ready-made CF D-box shells several sources However plan make few models having own vacuum pump bag will offer considerable savings Its good item club group purchase share typical vacuum-bagging setup consists bag heavy plastic about size shape large pillowcase hose connects vacuum pump item bagged simply slipped open end bag bag sealed pump turned sure use purpose-made vacuum pump will pull least 20 inches mercury under continuous operation can add vacuum gauge line check pressure After epoxy has cured remove plastic wrapping etc careful bend shell remove form Before can attach shell spar will need add front ribs spar Typically 1A6 balsa spaced about 15-20 mm apart spar-rib assembly often referred fishbone because its appearance light models leading edge usually used Sometimes thin strip carbon used leading edge reinforcement carbon inserted slots front ribs Another alternative use narrow balsa leading edge much hold ribs place during construction actual strength purpose After fishbone ready shell should trial-fitted over Mark trim shell overlaps back spar slightly can trim shell sharp knife straightedge Sand inside shell better adhesion use sandpaper wrapped over form Wipe lacquer thinner Coat spar ribs slow-curing epoxy glue blot off excess actually time-consuming fiddly part building D-box Ive best luck using small fine-textured sponge apply epoxy Insert fishbone shell cover plastic wrap place flat surface Use rubber bands masking tape hold shell down tight against ribs spar until epoxy sets After glue dries unwrap finished D-box sand excess shell off back sides main structural part wing finished Aft Ribs Trailing Edge Position completed D-box undercambered building board hold down masking tape rubber bands weights pin through D-box can however use pins along front rear help locate D-box carbon-fiber trailing edge should positioned next add balsa ribs usual manner using CyA epoxy Remove almost-finished wing building board carefully sand bottom Because trailing edges small cross-section rib-to-trailing-edge joint prone breakage stage careful keep CyA handy Strip off plentiful supply rib caps thin 001 003 carbon sheet Ive found easiest way cut sheet approximate length spar trailing edge distance plus about 1/2 inch strip off individual capstrips can make simple stripper single-edge razor blade two pieces scrap /i6 plywood can simply eyeball Another alternative use ready-made rib caps available several mail-order sources Start gluing caps place bottom wing caps should start about /e inch forward rear D box extend past trailing edge easiest way apply gap-filling CyA capstrip place position smooth down finger covered plastic wrap After bottom caps place trim excess cap material simply breaking off Sand top wing smooth add upper caps should done wing panel strapped down undercambered building board Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts / Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight AircrafL.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAI Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS tNC 909AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstametcom D & J ELECTRONICS Marigold St NW Hartville OH 44632 1236330-877-1445 hi ice & Repairs Most Radio Control Systems Utilizing Calibrated Test Equipment & Spectrum Analyzers Endors.d AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPS Mail WIM w W Visit home page http//wwwdnjeIectromcscom Email damd@dnjeIectronicscom jayne@dnielectronics AMA #256123ARRLWB8YSQ IT-BAR SANDERI 2 RIBS FOR EASIER HANDUNG 2 1/2 WIDE ALUMINUM EXTRUSION GREAT FOR SAND ING WING RIBS FUSELAGES AND BOAT HULLS ABRASIVE ROLLS PRESS-ON 7 YDS 2 112 WIDE JUST PEEL AND STICK ON T BAR SANDER OR ANY OTHER SANDING BLOCK 900 THE MINI DRILL cue12 DRILLS 52 TO 74 STORED IN PIN VISE 1ST QUALITY IORED ET CLIP HIGH SPEED STEEL L1____ NO 378 ____ $600 SET MICROCASSETTE SELF STARTING BLOW TORCH TORCH WORKS WITH ORDINARY OIGAREITE UGHTER 2300FtI300C PERFECT PIN-POINT FLME ONOFF SE1Y SWITCHj -WINDPROOF SELF STARlING BY PUSHING BUTTONa MT 772 WILIGHTER $800 EAS1ERH TOOL & SUPPLY CO 149 GRAND STREET NEW YORK CITY NY 10013 WHEN ORDERING PPD ADD $650 ADD $950 ORDERS 212-925-1006FAX 212-925-1010 Catalee $200 Free order accept Visa/MD warps build will stay no holding over teakettle carbon structures Since wing gets its strength carbon structure covering can use lightest plastic films covering information carbon D-box wing construction recommend Notes High-Tech Wing Construction Aram Schlosberg 1995 Symposium Report Quicker Composite Structures Chris Edge Mike Fantham British Free Flight Forum 1995 Both publications can ordered NFFS Publications 4858 Moorpark Ave San Jose CA 95129 Another useful publication also available NFFS NFFS International Planbook includes several articles construction well numerous three-view drawings models have never tried building carbon fiber urge give try results stronger stiffer consistent ever possible conventional balsa-and-tissue methods CF Stabs & Rudders Although some people suggest building FiB stabs rudders carbon fiber structural overkill sure nice have tail surfaces absolutely warp Building time actually less conventional all-balsa structures weights comparable Strength stiffness however CF D-box tails incredibly strong last few years Rex Hinson have collaborating Wakefield design construction Usually takes form us calling other claims new lighter better construction method stab shown photos version Rexs latest stab tapered planform effort reduce weight decreasing width D-box toward tips Construction follows standard methods outlined above except special tapered form carved followed swept-back shape desired D-box decided better keep trailing edge straight sweep back D-box Note center inch stab straight better fit against stab mount Molding carbon-fiber shell required bit pulling tugging get wetted out carbon cloth lay smoothly over form Teflon-coated glass cloth cut two center would conform swept-back shape After shell cured trimmed exact shape tapering about 3/e inch center about tips balsa center rib added rib extends about inch rear suit particular stab mounting system stab hammer comes up through middle stab stab overhangs rear tailboom about 1 inches 126 Model Aviation al mounting system stab hammer rear center rib could extend way rear spars stripped /16 balsa has CF cloth epoxied side vacuum-bagged full-depth spars taper about 5A2 center about /s tip spars glued place butting up against center rib soft balsa rib fitted tip no other ribs D-box rest structure consists carbon-fiber trailing edge /16 ribs end ribs 1/g balsa prevent rib bending inward after stab covered ribs capped 002 carbon fiber 28 sq din stabs come out around 32 35 grams uncovered rudder made much same way speed construction have made simple jig hold finished D-box trailing edge alignment Ribs simply rectangular pieces A6 x a After glued place rudder removed jig sanded symmetrical airfoil shape carbon rib caps added both sides problem far bottom rib effort save weight went too far bottom rib bending inward tension quarter mil Mylar covering Later rudders use inch lower rib wider carbon caps on Fiber Sources Composite Structures Technology carbon cloth strip epoxy vacuum pumps Teflon-coated glass cloth bagging supplies etc Box 642 Tehachapi CA 93581 Tel 805 822-4162 Web page wwwtminetcomlcstl Bradley Model Supply carbon strip spar sets 1337 Pine Sap Ct Orlando FL 32825 Starline International spar sets D-box shells 6146 B Cactus Wren Rd Scottsdale AZ 85253 Tel 602 948-5798 http/wwwstarln@ aolcom A-B-C Free Eight Supplies spar sets D-box shells Melis Jos Winterbeekstraat 1 3730 Hoeselt Belgium E-mail JosMelis@pingbe T-ON OWEN LESS HASSLE MORE FUN Dieselize wit/i Davis Diesel Its Awesome 1s4 C N DAVIS MODIL PRO 1997 10cc TopSpeed Bruce Bennett 1997 10cc TimeToClib Bruce Bennett NAMBA Boat Nationals 1996 A-OPC 35cc Mod Tun Joe Monohan 1996 B-OPC 75cc Mod Tun Don Hirami 1996 C-OPC 11cc Mod Tun Mike McKabney 1996 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