Javelin

easy build low-cost glider 17 Javelin ultra-low-cost easy build design has surprisingly good performance because highefficiency Eppler 201 wing airfoil section airplane flies well towline slope makes excellent trainer ft intended use regular-size servos receiver 500 mAh battery pack four-penlight dry cell pack comes lowcost two-channel radios features foam wing dowel-rod spars covered regular brown kraft paper very rugged simple balsa sheet fuselage tail construction quite incredibly cheap maybe little $30 ready fly Foam wings may bit off-putting novice does have means hand cut foam cores However several ways around big savings building time go route Some ways get foam wing cores quite likely club modeler area has equipment will happy help hobby shop may able help put touch someone can can order foam cores cut specification firms advertise service such Wing Manufacturing Co can make up own foam cutter Once have used foam wings may want use method often future See brief description foam cutting end article may find detailed description elsewhere such how-to-do-it hobby books sale library Foam wings have advantages including accurate airfoil section traditional rib-and-spar structure airfoil chosen can also complex unlike trainers use less-efficient flat-bottom section Foam wings can easily employ washout Javelin does wing has slight twist tip wing having slightly lower angle incidence root prevents tip stalling Construction fastereven time spent cutting out foam foam wing covered brown paper painted big cost savings over film-covered balsa structure wing very toughalmost crashproof high-performance sailplanes use foam-core wings may well start method will probably end up using anyway CONSTRUCTION Wing careful using glue StyrofoamTM PVA Poly Vinyl Acetate aliphatic resin glues like Titebond work well does epoxy epoxy quite heavy should used sparingly Glues solvents like balsa cement normal cyanoacrylate CyA glues will melt foam special CyA glues available suitable however Cut foam cores sand lightly 200-grit sandpaper smooth off try sand rear trailing edge sharp edge too thin will warp covered Mark spar positions felt-tip pen long 8 Model Aviation r some flying fun Javelin being flown slopes above city Pietermaritzburg South Africa straightedge Cut grooves spars have precisely fitted bottom groove Cut sides grooves sharp knife chisel out foam small screwdriver Dremel tool could also job coarse-grit sandpaper wrapped around edge ruler ordinary file Glue spar dowels place white glue try fill up slot glueuse just enough secure place dry trim off excess dowel lengths ends glue tip plates Cover wings brown kraft paper piece wrapped around leading edge Start bottom little excess sticking out trailing edge TE bottom covered creases smoothed out trim excess paper TB used thick wallpaper glue white glue thinned 50/50 water also works well Wet paper thoroughly glue covering wait least five minutes before using let soak up some water Note expands somewhat wet shrinks drying minor wrinkles will disappear Wrap paper around leading edge smooth top Wrap around TB trim paper leaving about -inch overlap bottom add strength thin TE Let wing dry about four hours replace foam blocks cut Pile books top weight down let dry night will ensure straight warped Glue preferably two strips brown paper about inch wide along leading edge reinforce landing spiky grass etc slope Gummed paper tape can also used Sand root ends correct sloped angle halves joined dihedral fit reasonably well Use quick setting epoxy join wing halves Add glass cloth epoxy resin center-section covering Photos author Graphic Design Carla Kunz May1998 9 author Javelin Simple rugged construction provides plenty flying minimal timelmoney investment Note normal fibreglass resin polyester attacks foam use epoxy resin Epoxy glue tubes will work fine spread thinly use slow-setting type Tail Cut parts sand edges lightly round Covering plastic film recommended essential could undercoat sand paint Plastic film lighter avoids having add lead weight nose balance airplane Make two control horns glue notches cut elevator rudder using epoxy CyA Cut slits surfaces hinges hinge rudder fin elevator tailplane Because thin balsa Easy Hinges similar thin MylarTMtype hinges used film covering used must removed rudder glued elevator /j6 triangular reinforcement fitted Cut film lightly sharp blade peel away being careful cut balsa Glue rudder onto elevator add triangular sections dry cover triangle balsa small piece film Fuselage Glue F5 tail doublers fuselage sides rear Glue fuselage sides nose block former Fl top plans ensure accurate fit Add StyrofoamTM filler nose sand smooth match top bottom dry add F2 F3 tailpost using clothespin similar clamp hold rear together should also done over plans ensure straightness Fit bottom sheet below Fl plywood towbook plate Glue four servo mounts correct spacing servos dry enlarge holes servo lead wires neccessary Add rest bottom sheeting Note bottom sheeting nose May1998 11 May 1998 13 Control cords exit fuselage through slot top sheet except lower elevator horn cord exits slot fuselage side Basic radio installation sheet-balsa fuselage Note control cord routing Type RC slope sport/trainer glider Wingspan 72 inches Functions Elevator rudder Flying Weight 25 ounces Construction Balsa fuselage tail StyrofoamTM wing dowel spars Covering Kraft paper wing fuselage film tail Hatch cover held place balsa tongue front screw back has grain running across fuselage strengthen against landing impact Attach top front sheeting far hatch start line Drape kitchen cling wrap over fuselage sides hatch pin against sides hatch side reinforcing rails pins removable outside please Glue hatch sheeting onto dry remove hatch add front tongue hold-down screw Glue antenna tube made drinking straws place Note join drinking straws cutting short slit end forcing end over second tube Make second tube become forward feed antenna wire down tube does catch joint Fit control cord tube same way Feed four lengths kite string heavy cotton through control cord tube Note cord must now sent through hole fuselage side lower elevator horn Make large knots tabs masking tape prevent ends slipping back inside tube necessary fine piece wire can fed through completed model rudder end rethread control cords model string breaks remaining cords can used pull new set through tube Glue rear top place Sand fuselage smooth being careful control cords original fuselage covered brown paper economical adds strength simple gives good finish paint Plastic film can also used balsa can undercoated painted Cover nose fibreglass cloth per plan Polyester epoxy resin white glue can used cloth Assembly Attach wing rubber band dowels sand fuselage sides neccessary let wing fit snugly top wing mounted fuselage trial-fit tailplane fuselage Looking back tail must have tilt compared wing Trim fuselage sides tail mounted until accurate Also check looking top tailplane right angles fuselage aligned correctly glue tail place Paint wings fuselage painting foam wings use solvent-type paint such dope may attack foam through paper used coat ordinary PVA house paint followed coat household polyurethane satinfinish paint Sand smooth after first coat good finish using 220- 360-grit paper Paint color trim desired Painting different color underside will help orient flying Mount switch radio gear battery pack four-cell flat type will fit nose nor will fit other gliders either Find someone handy soldering iron rearrange cells cube four instead Clamp elevator rudder using strips balsa clothespins tie control cords threaded adjusters quick links servos control horns rudder use servo arm holes furthest servo holes rudder closest elevator use second hole servo center hole farthest center elevator Move needed get correct amount total movement specified plan Remove clothespins use threaded rod adjusters get controls centered cords gently tightened An alternative threaded adjusters simply use length soft wire straightened paperclip between horn string loop made end string go through horn Adjustment made putting zigzag bends tighten Check model balances close marked balance point behind tail heavy could cause unstable flight unwanted snap rolls Add lead nose until within plan position can remove stages after flying test effect balance point slightly front plan position very serious will just mean lots up elevator needed keep nose up can go ahead fly little say about flying performance Javelin easy control launches well off towline electric winch hi-start slope-soars superbly gentle winds can have flights hand launch just ask helper throw like well . Javelin Neil Allen Box 132 Pietermaritzburg 3200 South Africa 12 Model Aviation CR TEXT WING PLAN RIGHT SIDE vVC BOWEL SPARS-TOP ANN BOTTOM LzI NOTE BRA IS STYROPSAN COVERER 010 BOWEL SPAR BOTTOM ONLY RARER SEAM CONTROL LINES TIER TO SERVO O LAMINATIONS OF SIR BALSA BATTERY RECEIVER WING DIHEDRAL DETAIL SOB BALSA SECET P1F-BFT HALES FOR NGLS FOAM CUTTING"TO PIN TEMPLATE TEMPLATESTO FOAM BLOOD I/W BALSA ORCES DOOBLER PS\ CONTROL MOVEMENTS SORRERI I2 LEFT ARC RIART ELEVATORISO OP ANO DOWN PLYWOOD SAND TIP /1) 2 EASY BINGE TYPICAL LBRALSG SREET TO ADJUSTABLE CLEVIS ELEV ELEVATOR SORN II WINO TIP PATTERN SINGE LOCATION BOARD MATERIAL ALTERNATEER BALSA USC STOCK BRASS BOLTED RACESAC CT DOWELTAO BALSATO RACE OG CONTROLS SRCCTS/lB BALSA SAN BALSA SSECT ITOPOR RALS GRAIN LENGTHWISE ANTENNAI _______________________TRISTOER TONE WCATIONVI III F-SF-SF-4 805N ONINKING ______________________________________RUDDERTAG BALSA TAB DOWEL FORTORE FOR CONTROL WINGDLINES ELEV RORN ORINEING STRAW I/IN BALSA SODET ORABLERVEBTICAL GRAN iTTNREET 0BBASN I MODEL AVIATION ROSE RACE TO TOWOGRO LOCAT ION IJAVELIN NOTEI JAVELIN IS DESIGNED BCSNNERRT RESRBROCE ALLEN FOR D CHAUINEL RADIO THEDRAWN NT NEIL N BRACE ALLEN MODEL IS GLIDER WITH A INNER PLAN BY ABE DEMABER 72 WING SPAN cONTROL CORDSI/S PLY Vt SIlO DOWEL WING PATTERNSIR BALSASECT A-A LOOKING BACK 1/4 BOWEL RAILSASCREWPONT SIlO BALSA SOECT FORE TOP ONAIN OROSSWRE S LABINATIOSS OP SIIRBALSA SHEET FORDLAGE BOTYRN EROSOWNE EDVO UCENTS OPTIRNALTOROOO 02 BALSA BLOCS AT El ON CHANGEROOST TO TORO SIlO LABS SIlO BALSA SHEET EBSELAGE SIDES FUSELAGE SIDE VIEW E 1 N 0 -o i w 0 0 0 0 0 0 CWIRE FIBEOSLASS CLOTS S EPOXY RESIN NOT POLYESTER

easy build low-cost glider 17 Javelin ultra-low-cost easy build design has surprisingly good performance because highefficiency Eppler 201 wing airfoil section airplane flies well towline slope makes excellent trainer ft intended use regular-size servos receiver 500 mAh battery pack four-penlight dry cell pack comes lowcost two-channel radios features foam wing dowel-rod spars covered regular brown kraft paper very rugged simple balsa sheet fuselage tail construction quite incredibly cheap maybe little $30 ready fly Foam wings may bit off-putting novice does have means hand cut foam cores However several ways around big savings building time go route Some ways get foam wing cores quite likely club modeler area has equipment will happy help hobby shop may able help put touch someone can can order foam cores cut specification firms advertise service such Wing Manufacturing Co can make up own foam cutter Once have used foam wings may want use method often future See brief description foam cutting end article may find detailed description elsewhere such how-to-do-it hobby books sale library Foam wings have advantages including accurate airfoil section traditional rib-and-spar structure airfoil chosen can also complex unlike trainers use less-efficient flat-bottom section Foam wings can easily employ washout Javelin does wing has slight twist tip wing having slightly lower angle incidence root prevents tip stalling Construction fastereven time spent cutting out foam foam wing covered brown paper painted big cost savings over film-covered balsa structure wing very toughalmost crashproof high-performance sailplanes use foam-core wings may well start method will probably end up using anyway CONSTRUCTION Wing careful using glue StyrofoamTM PVA Poly Vinyl Acetate aliphatic resin glues like Titebond work well does epoxy epoxy quite heavy should used sparingly Glues solvents like balsa cement normal cyanoacrylate CyA glues will melt foam special CyA glues available suitable however Cut foam cores sand lightly 200-grit sandpaper smooth off try sand rear trailing edge sharp edge too thin will warp covered Mark spar positions felt-tip pen long 8 Model Aviation r some flying fun Javelin being flown slopes above city Pietermaritzburg South Africa straightedge Cut grooves spars have precisely fitted bottom groove Cut sides grooves sharp knife chisel out foam small screwdriver Dremel tool could also job coarse-grit sandpaper wrapped around edge ruler ordinary file Glue spar dowels place white glue try fill up slot glueuse just enough secure place dry trim off excess dowel lengths ends glue tip plates Cover wings brown kraft paper piece wrapped around leading edge Start bottom little excess sticking out trailing edge TE bottom covered creases smoothed out trim excess paper TB used thick wallpaper glue white glue thinned 50/50 water also works well Wet paper thoroughly glue covering wait least five minutes before using let soak up some water Note expands somewhat wet shrinks drying minor wrinkles will disappear Wrap paper around leading edge smooth top Wrap around TB trim paper leaving about -inch overlap bottom add strength thin TE Let wing dry about four hours replace foam blocks cut Pile books top weight down let dry night will ensure straight warped Glue preferably two strips brown paper about inch wide along leading edge reinforce landing spiky grass etc slope Gummed paper tape can also used Sand root ends correct sloped angle halves joined dihedral fit reasonably well Use quick setting epoxy join wing halves Add glass cloth epoxy resin center-section covering Photos author Graphic Design Carla Kunz May1998 9 author Javelin Simple rugged construction provides plenty flying minimal timelmoney investment Note normal fibreglass resin polyester attacks foam use epoxy resin Epoxy glue tubes will work fine spread thinly use slow-setting type Tail Cut parts sand edges lightly round Covering plastic film recommended essential could undercoat sand paint Plastic film lighter avoids having add lead weight nose balance airplane Make two control horns glue notches cut elevator rudder using epoxy CyA Cut slits surfaces hinges hinge rudder fin elevator tailplane Because thin balsa Easy Hinges similar thin MylarTMtype hinges used film covering used must removed rudder glued elevator /j6 triangular reinforcement fitted Cut film lightly sharp blade peel away being careful cut balsa Glue rudder onto elevator add triangular sections dry cover triangle balsa small piece film Fuselage Glue F5 tail doublers fuselage sides rear Glue fuselage sides nose block former Fl top plans ensure accurate fit Add StyrofoamTM filler nose sand smooth match top bottom dry add F2 F3 tailpost using clothespin similar clamp hold rear together should also done over plans ensure straightness Fit bottom sheet below Fl plywood towbook plate Glue four servo mounts correct spacing servos dry enlarge holes servo lead wires neccessary Add rest bottom sheeting Note bottom sheeting nose May1998 11 May 1998 13 Control cords exit fuselage through slot top sheet except lower elevator horn cord exits slot fuselage side Basic radio installation sheet-balsa fuselage Note control cord routing Type RC slope sport/trainer glider Wingspan 72 inches Functions Elevator rudder Flying Weight 25 ounces Construction Balsa fuselage tail StyrofoamTM wing dowel spars Covering Kraft paper wing fuselage film tail Hatch cover held place balsa tongue front screw back has grain running across fuselage strengthen against landing impact Attach top front sheeting far hatch start line Drape kitchen cling wrap over fuselage sides hatch pin against sides hatch side reinforcing rails pins removable outside please Glue hatch sheeting onto dry remove hatch add front tongue hold-down screw Glue antenna tube made drinking straws place Note join drinking straws cutting short slit end forcing end over second tube Make second tube become forward feed antenna wire down tube does catch joint Fit control cord tube same way Feed four lengths kite string heavy cotton through control cord tube Note cord must now sent through hole fuselage side lower elevator horn Make large knots tabs masking tape prevent ends slipping back inside tube necessary fine piece wire can fed through completed model rudder end rethread control cords model string breaks remaining cords can used pull new set through tube Glue rear top place Sand fuselage smooth being careful control cords original fuselage covered brown paper economical adds strength simple gives good finish paint Plastic film can also used balsa can undercoated painted Cover nose fibreglass cloth per plan Polyester epoxy resin white glue can used cloth Assembly Attach wing rubber band dowels sand fuselage sides neccessary let wing fit snugly top wing mounted fuselage trial-fit tailplane fuselage Looking back tail must have tilt compared wing Trim fuselage sides tail mounted until accurate Also check looking top tailplane right angles fuselage aligned correctly glue tail place Paint wings fuselage painting foam wings use solvent-type paint such dope may attack foam through paper used coat ordinary PVA house paint followed coat household polyurethane satinfinish paint Sand smooth after first coat good finish using 220- 360-grit paper Paint color trim desired Painting different color underside will help orient flying Mount switch radio gear battery pack four-cell flat type will fit nose nor will fit other gliders either Find someone handy soldering iron rearrange cells cube four instead Clamp elevator rudder using strips balsa clothespins tie control cords threaded adjusters quick links servos control horns rudder use servo arm holes furthest servo holes rudder closest elevator use second hole servo center hole farthest center elevator Move needed get correct amount total movement specified plan Remove clothespins use threaded rod adjusters get controls centered cords gently tightened An alternative threaded adjusters simply use length soft wire straightened paperclip between horn string loop made end string go through horn Adjustment made putting zigzag bends tighten Check model balances close marked balance point behind tail heavy could cause unstable flight unwanted snap rolls Add lead nose until within plan position can remove stages after flying test effect balance point slightly front plan position very serious will just mean lots up elevator needed keep nose up can go ahead fly little say about flying performance Javelin easy control launches well off towline electric winch hi-start slope-soars superbly gentle winds can have flights hand launch just ask helper throw like well . Javelin Neil Allen Box 132 Pietermaritzburg 3200 South Africa 12 Model Aviation CR TEXT WING PLAN RIGHT SIDE vVC BOWEL SPARS-TOP ANN BOTTOM LzI NOTE BRA IS STYROPSAN COVERER 010 BOWEL SPAR BOTTOM ONLY RARER SEAM CONTROL LINES TIER TO SERVO O LAMINATIONS OF SIR BALSA BATTERY RECEIVER WING DIHEDRAL DETAIL SOB BALSA SECET P1F-BFT HALES FOR NGLS FOAM CUTTING"TO PIN TEMPLATE TEMPLATESTO FOAM BLOOD I/W BALSA ORCES DOOBLER PS\ CONTROL MOVEMENTS SORRERI I2 LEFT ARC RIART ELEVATORISO OP ANO DOWN PLYWOOD SAND TIP /1) 2 EASY BINGE TYPICAL LBRALSG SREET TO ADJUSTABLE CLEVIS ELEV ELEVATOR SORN II WINO TIP PATTERN SINGE LOCATION BOARD MATERIAL ALTERNATEER BALSA USC STOCK BRASS BOLTED RACESAC CT DOWELTAO BALSATO RACE OG CONTROLS SRCCTS/lB BALSA SAN BALSA SSECT ITOPOR RALS GRAIN LENGTHWISE ANTENNAI _______________________TRISTOER TONE WCATIONVI III F-SF-SF-4 805N ONINKING ______________________________________RUDDERTAG BALSA TAB DOWEL FORTORE FOR CONTROL WINGDLINES ELEV RORN ORINEING STRAW I/IN BALSA SODET ORABLERVEBTICAL GRAN iTTNREET 0BBASN I MODEL AVIATION ROSE RACE TO TOWOGRO LOCAT ION IJAVELIN NOTEI JAVELIN IS DESIGNED BCSNNERRT RESRBROCE ALLEN FOR D CHAUINEL RADIO THEDRAWN NT NEIL N BRACE ALLEN MODEL IS GLIDER WITH A INNER PLAN BY ABE DEMABER 72 WING SPAN cONTROL CORDSI/S PLY Vt SIlO DOWEL WING PATTERNSIR BALSASECT A-A LOOKING BACK 1/4 BOWEL RAILSASCREWPONT SIlO BALSA SOECT FORE TOP ONAIN OROSSWRE S LABINATIOSS OP SIIRBALSA SHEET FORDLAGE BOTYRN EROSOWNE EDVO UCENTS OPTIRNALTOROOO 02 BALSA BLOCS AT El ON CHANGEROOST TO TORO SIlO LABS SIlO BALSA SHEET EBSELAGE SIDES FUSELAGE SIDE VIEW E 1 N 0 -o i w 0 0 0 0 0 0 CWIRE FIBEOSLASS CLOTS S EPOXY RESIN NOT POLYESTER