WELCOME BACK Combat fans Take some time off bashing airplanes look over latest foam-wing Combat airplanes Combat has around quite awhile Combat planes tend very similar Bumble bee II wraps typical wing stabila tor around new practical foam wing structure result 18 oz machine can fly best balsa ships Bumblebee developed out necessity hate framing up wings love try new designs foam wing much easier quicker build conventional wing An added advantage balsa prices soaring lately Bum blebee considerably cheaper build often very important factor usually plan have least two planes contest care too easy wipe out plane match two six eight planes build big difference between ten bucks balsa kit four Bumblebee costs BumbbBee Mk1 U Bumblebee requires different build ing techniques balsa ship fin ishing done before final assembly cant hold over head make air plane noises soon once prelimi naries done whole thing falls together less hour couple words about adhesives finishing materials Styrofoam may have heard rather finicky stuff Model cement dope polyester resin will rapidly melt big holes Use epoxy glues water-based glues such aliphatic resin types like Titebond Use water-based glue spars trail ing edge ribs Use epoxy either alone mixed microballoons final assembly covering pretty impor tant best procedure two step pro cess First cover cores before final assembly Silkspan applied wall paper paste After assembling wing cover Solarfilm conventional way pinch Silkspan can skip ped helps stiffen wing slightly isnt absolutely necessary Begin construction cutting wing cores suggest get touch someone havent done before Wing cutting easy demonstrate pretty complicated describe use sim ple spring-loaded cutting bow strung 008 solid control-line wire model train transformer supplies electricity about amp 12 volts Carefully cut tem plates /8 ply Sand edges very smooth make sure templates symmetrical lay piece paper trace around Flip template Fast Combat design featuring foam wing construction Phil Cartier over see outlines match little judicious use sanding block will make templates exactly symmetrical Dont worry templates slightly different what plan shows Other fairly blunt leading edge isnt anything critical about airfoil important make symmetrical Drill couple holes template finishing nails will help hold template foam during cutting spar slots cut after cutting cores can use hot wire extra set templates else just sand shape sanding block Check fit spars slots should snug flush surface foam Carefully mark cut slots leading edge spar main spar joiner trailing edge spar Also recess foam root right panel center rib motor mount left panel recessed ahead spar motor mount An X-Acto saw thin sharp knife best tool making cuts Glue tip ribs center rib main spars trailing edges place Titebond Masking tape will hold everything place glue dries motor mount stabilator assem bly standard Combat items just few things note motor mount laminated three pieces /s balsa outer plys have vertical grain center ply has horizontal grain center ply also has stub inter locks center rib spar joiner Glue motor mount part together epoxy allow dry Drill hole dowel pin motor mounting bolts saw mounts final shape make slots leading edge joiner bellcrank mount stabilator made usual way Make sure hinge pins set back leading edge shown June 1976 Above Except foam wing ship con ventional author finds wing quicker easier build six eight ships man ages saving six dollars over balsa Below Fox Schneurle penbladder being filled Pinch-off EK product Bumblebee Mk II necessary because 2 bellcrank doesnt have enough leverage some aero dynamic balance Also reinforce hinges booms layer fiberglass over hinge pins under control horn around booms just behind cut-out wing using bass booms also fiberglass tips booms before drilling holes hinges Start finishing cores sanding off lumps excess balsa #100 sand paper Use large sanding block light pressure avoid tearing foam Sand cores smooth #150 paper #220 paper Cover cores Silkspan Use four pieces top bot tom panel Use wallpaper paste hold Silkspan Follow directions package mixing apply liberal amount styrofoam Smooth dampened Silkspan place allow dry Sand #220 paper remove ridges rough spots Make up pen bladder compartment BT-55 rocket body Block end bulkhead balsa Fuel-proof couple coats dope Make hole right-hand panel hold fuel compartment /i sink drain tube hardware store has just right diameter job Epoxy fuel com partment place Preassemble plane glue check fit parts joints should tight easy slip fit Sand cores spar joiners other pieces necessary get smooth joints satis fied parts fit properly mix up one-ounce batch slow-drying epoxy such Hobby Poxy II Blend equal vol ume microballoons reduces density epoxy helps fill gaps joints Use leading edge spar spreader work glue spar slots foam joints gen erous Just take care excess wont freeze bellcrank pushrod dries Thread leadouts through left coreandslide thejoiner/bellcrank assembly place Add trailing edge spar motor mount leading edge Slide right panel onto spars push wing panels together firmly Wipe off excess glue check alignment parts before glue sets Some pitfalls watch out Make sure parts ready final assembly before mixing glue Dont forget pushrod sure keep glue off bellcrank pushrod Cover wings before adding booms usually use Solarfilm other plastics will adhere low temperature Unfortunately Monokote requires too high temperature melts foam super cheap covering consists layer fabric such Mid wests Microlon nylon applied wallpaper paste finished two three coats polyurethane varnish Glue /s eyelets left tip lead out guides Finish ofT ends leadouts method diagrammed rule book control lines will also work well leadouts Epoxy tip weight right tip didnt earlier Carve pod shape reinforce fiber glass Poke some holes covering booms go epoxy place Flying easiest part Just make sure no obvious warps Look ALL WOOD MEIt BALSA UNLESS OTHERWISE NOTED MAIN SPAR JOINER 1/SINHARD BALSA OR SIG LITE PLY BO OMS 3/16 INBASSWOOD CENTER RIB /8 IN HARD BALSA MOTOR MOUNT DOUBLER 118 IN HARD BALSA I/ SHEET 1/8 BIRCH DOWEL PIN. 2 IN NYLON BELLC RANK 3/8 SQ MAPLE xY EYELET LEADOUTMOTOR MOUNTS BEND PUSHROE 0 0 4/40 BLIND NUTS4L 7 -- - 7 HOLLOW LEA WITH HOT I/ 7-7----- 7---K- 448 Model Aviation rear plane arms length wing opposite direction ironing outermost hole two bellcrank away Gradually tilt nose up down covering makes controls considerably quicker Since rear portion airfoil flat Set up controls pushrod other designs After youve gotthe trailing edge will block rest the outermost hole control horn ten feel plane pushrod can wing view no warps seasoned flier recoin- moved during trimming out Remove warps gently twisting mend starting out pushrod the continued page 93 LEADING EDGE SPAR 1/2 SHEET GUSSET IPERTIGRE G21 SHOWN --BT-55 ROCKET BODY SPAR LOCATION-GROOVE FOAM FOR SPARS AFTER CUTTINGOORES MW FIBERGLASS OVER HINGE PINS AND BUMBLEBEE II DESIGNED AND DRAWN BY S SHOWN COUPLER0I23456 10/75 / ON C/LI/I6 MW PUSHROD June 1976 49 Burn ble Bee/Ca rtie r continued page 49 flying field check everything once again fire up Take couple level laps everything seems okay try couple large ioops figure-eights Warps will show up decrease line tension during maneuvers lines get light during inside loops plane has left-rolling warp Light lines during outside loop mean right-rolling warp warps show up take out before flying again Warps can make Combat plane very hairy fly Check tip weight watching plane carefully during some tight figureeights should remain square lines never show top bottom wing during maneuvers Too little tip weight will make plane bank during maneuvers Too much will make bank out Add subtract tip weight until plane doesnt bank during maneuvers rest trimming done ad justing stab movement position balance point Increase stab travel move balance point back make plane responsive too touchy controls use heavier en gine cut down movement stab highly personal thing Some peo ple like very responsive meaning hairtrigger controls Others like smoother less sensitive controls So dont afraid experiment find out what suits Combat article always has some speed performance claims wont make Use Supertigre G21 Fox Schneurle Use 8/8 prop much nitro pocketbook can stand 20% nitro youll probably spend much time repairing engines building planes Last least join MACA Miniature Aircraft Combat Assoc Combat flier Send name address along check money order $500 Tom Southern 2207 Paul Longview TX 75601 MACA puts out dynamite newsletter latest Com bat news happenings Demonstrating right way launch combat shiptake step let fly out hands FF Duration/Meuser continued page 41 Young Regan added turbulator spars shown options Starduster X plans increased widths floats 3/8 added stability water Sal recommends models tipping scales anything over 6-oz mark Sproing need spring prop tensioner timer auto-start Nordic autorudder whatever find cigar box labeled springs assorted Inside find 436 springs ball-point pen refills spring front suspension 1941 Buick nothing between Get out hand drill clamp vise stick nail chuck lash piece wire chuck somehow crank away Half hour later have lacerations abra sions contusions rather wobbly looking spring Entertah-daaa KVG r Little Gem Handy Dandy Spring Winder KVG consists a thick wash er serves place anchor wire handle foundation b four music-wire mandrels 032 076 diameter upon springs may wound c winder bar latter has oversize hole slips over mandrel choice adjusting screw lock-nut makes fit mandrel anyhow hardened steel finger presses loose end wire against mandrel Getting thing started bit tricky once spring started just twist away winder bar out comes perfectly uniform tightly coiled springonly slightly largerthan mandrel greatest problem run out wire Its darned much fun making silly things running out wire could blessing disguise lots wire could starve death Basically machine makes tension spring compression spring what after simply stretch tension HYDRO-STAR 300 5/05 June 1976 93 Safe Flying No Accident
Edition: Model Aviation - 1976/06
Page Numbers: 47, 48, 49, 93
WELCOME BACK Combat fans Take some time off bashing airplanes look over latest foam-wing Combat airplanes Combat has around quite awhile Combat planes tend very similar Bumble bee II wraps typical wing stabila tor around new practical foam wing structure result 18 oz machine can fly best balsa ships Bumblebee developed out necessity hate framing up wings love try new designs foam wing much easier quicker build conventional wing An added advantage balsa prices soaring lately Bum blebee considerably cheaper build often very important factor usually plan have least two planes contest care too easy wipe out plane match two six eight planes build big difference between ten bucks balsa kit four Bumblebee costs BumbbBee Mk1 U Bumblebee requires different build ing techniques balsa ship fin ishing done before final assembly cant hold over head make air plane noises soon once prelimi naries done whole thing falls together less hour couple words about adhesives finishing materials Styrofoam may have heard rather finicky stuff Model cement dope polyester resin will rapidly melt big holes Use epoxy glues water-based glues such aliphatic resin types like Titebond Use water-based glue spars trail ing edge ribs Use epoxy either alone mixed microballoons final assembly covering pretty impor tant best procedure two step pro cess First cover cores before final assembly Silkspan applied wall paper paste After assembling wing cover Solarfilm conventional way pinch Silkspan can skip ped helps stiffen wing slightly isnt absolutely necessary Begin construction cutting wing cores suggest get touch someone havent done before Wing cutting easy demonstrate pretty complicated describe use sim ple spring-loaded cutting bow strung 008 solid control-line wire model train transformer supplies electricity about amp 12 volts Carefully cut tem plates /8 ply Sand edges very smooth make sure templates symmetrical lay piece paper trace around Flip template Fast Combat design featuring foam wing construction Phil Cartier over see outlines match little judicious use sanding block will make templates exactly symmetrical Dont worry templates slightly different what plan shows Other fairly blunt leading edge isnt anything critical about airfoil important make symmetrical Drill couple holes template finishing nails will help hold template foam during cutting spar slots cut after cutting cores can use hot wire extra set templates else just sand shape sanding block Check fit spars slots should snug flush surface foam Carefully mark cut slots leading edge spar main spar joiner trailing edge spar Also recess foam root right panel center rib motor mount left panel recessed ahead spar motor mount An X-Acto saw thin sharp knife best tool making cuts Glue tip ribs center rib main spars trailing edges place Titebond Masking tape will hold everything place glue dries motor mount stabilator assem bly standard Combat items just few things note motor mount laminated three pieces /s balsa outer plys have vertical grain center ply has horizontal grain center ply also has stub inter locks center rib spar joiner Glue motor mount part together epoxy allow dry Drill hole dowel pin motor mounting bolts saw mounts final shape make slots leading edge joiner bellcrank mount stabilator made usual way Make sure hinge pins set back leading edge shown June 1976 Above Except foam wing ship con ventional author finds wing quicker easier build six eight ships man ages saving six dollars over balsa Below Fox Schneurle penbladder being filled Pinch-off EK product Bumblebee Mk II necessary because 2 bellcrank doesnt have enough leverage some aero dynamic balance Also reinforce hinges booms layer fiberglass over hinge pins under control horn around booms just behind cut-out wing using bass booms also fiberglass tips booms before drilling holes hinges Start finishing cores sanding off lumps excess balsa #100 sand paper Use large sanding block light pressure avoid tearing foam Sand cores smooth #150 paper #220 paper Cover cores Silkspan Use four pieces top bot tom panel Use wallpaper paste hold Silkspan Follow directions package mixing apply liberal amount styrofoam Smooth dampened Silkspan place allow dry Sand #220 paper remove ridges rough spots Make up pen bladder compartment BT-55 rocket body Block end bulkhead balsa Fuel-proof couple coats dope Make hole right-hand panel hold fuel compartment /i sink drain tube hardware store has just right diameter job Epoxy fuel com partment place Preassemble plane glue check fit parts joints should tight easy slip fit Sand cores spar joiners other pieces necessary get smooth joints satis fied parts fit properly mix up one-ounce batch slow-drying epoxy such Hobby Poxy II Blend equal vol ume microballoons reduces density epoxy helps fill gaps joints Use leading edge spar spreader work glue spar slots foam joints gen erous Just take care excess wont freeze bellcrank pushrod dries Thread leadouts through left coreandslide thejoiner/bellcrank assembly place Add trailing edge spar motor mount leading edge Slide right panel onto spars push wing panels together firmly Wipe off excess glue check alignment parts before glue sets Some pitfalls watch out Make sure parts ready final assembly before mixing glue Dont forget pushrod sure keep glue off bellcrank pushrod Cover wings before adding booms usually use Solarfilm other plastics will adhere low temperature Unfortunately Monokote requires too high temperature melts foam super cheap covering consists layer fabric such Mid wests Microlon nylon applied wallpaper paste finished two three coats polyurethane varnish Glue /s eyelets left tip lead out guides Finish ofT ends leadouts method diagrammed rule book control lines will also work well leadouts Epoxy tip weight right tip didnt earlier Carve pod shape reinforce fiber glass Poke some holes covering booms go epoxy place Flying easiest part Just make sure no obvious warps Look ALL WOOD MEIt BALSA UNLESS OTHERWISE NOTED MAIN SPAR JOINER 1/SINHARD BALSA OR SIG LITE PLY BO OMS 3/16 INBASSWOOD CENTER RIB /8 IN HARD BALSA MOTOR MOUNT DOUBLER 118 IN HARD BALSA I/ SHEET 1/8 BIRCH DOWEL PIN. 2 IN NYLON BELLC RANK 3/8 SQ MAPLE xY EYELET LEADOUTMOTOR MOUNTS BEND PUSHROE 0 0 4/40 BLIND NUTS4L 7 -- - 7 HOLLOW LEA WITH HOT I/ 7-7----- 7---K- 448 Model Aviation rear plane arms length wing opposite direction ironing outermost hole two bellcrank away Gradually tilt nose up down covering makes controls considerably quicker Since rear portion airfoil flat Set up controls pushrod other designs After youve gotthe trailing edge will block rest the outermost hole control horn ten feel plane pushrod can wing view no warps seasoned flier recoin- moved during trimming out Remove warps gently twisting mend starting out pushrod the continued page 93 LEADING EDGE SPAR 1/2 SHEET GUSSET IPERTIGRE G21 SHOWN --BT-55 ROCKET BODY SPAR LOCATION-GROOVE FOAM FOR SPARS AFTER CUTTINGOORES MW FIBERGLASS OVER HINGE PINS AND BUMBLEBEE II DESIGNED AND DRAWN BY S SHOWN COUPLER0I23456 10/75 / ON C/LI/I6 MW PUSHROD June 1976 49 Burn ble Bee/Ca rtie r continued page 49 flying field check everything once again fire up Take couple level laps everything seems okay try couple large ioops figure-eights Warps will show up decrease line tension during maneuvers lines get light during inside loops plane has left-rolling warp Light lines during outside loop mean right-rolling warp warps show up take out before flying again Warps can make Combat plane very hairy fly Check tip weight watching plane carefully during some tight figureeights should remain square lines never show top bottom wing during maneuvers Too little tip weight will make plane bank during maneuvers Too much will make bank out Add subtract tip weight until plane doesnt bank during maneuvers rest trimming done ad justing stab movement position balance point Increase stab travel move balance point back make plane responsive too touchy controls use heavier en gine cut down movement stab highly personal thing Some peo ple like very responsive meaning hairtrigger controls Others like smoother less sensitive controls So dont afraid experiment find out what suits Combat article always has some speed performance claims wont make Use Supertigre G21 Fox Schneurle Use 8/8 prop much nitro pocketbook can stand 20% nitro youll probably spend much time repairing engines building planes Last least join MACA Miniature Aircraft Combat Assoc Combat flier Send name address along check money order $500 Tom Southern 2207 Paul Longview TX 75601 MACA puts out dynamite newsletter latest Com bat news happenings Demonstrating right way launch combat shiptake step let fly out hands FF Duration/Meuser continued page 41 Young Regan added turbulator spars shown options Starduster X plans increased widths floats 3/8 added stability water Sal recommends models tipping scales anything over 6-oz mark Sproing need spring prop tensioner timer auto-start Nordic autorudder whatever find cigar box labeled springs assorted Inside find 436 springs ball-point pen refills spring front suspension 1941 Buick nothing between Get out hand drill clamp vise stick nail chuck lash piece wire chuck somehow crank away Half hour later have lacerations abra sions contusions rather wobbly looking spring Entertah-daaa KVG r Little Gem Handy Dandy Spring Winder KVG consists a thick wash er serves place anchor wire handle foundation b four music-wire mandrels 032 076 diameter upon springs may wound c winder bar latter has oversize hole slips over mandrel choice adjusting screw lock-nut makes fit mandrel anyhow hardened steel finger presses loose end wire against mandrel Getting thing started bit tricky once spring started just twist away winder bar out comes perfectly uniform tightly coiled springonly slightly largerthan mandrel greatest problem run out wire Its darned much fun making silly things running out wire could blessing disguise lots wire could starve death Basically machine makes tension spring compression spring what after simply stretch tension HYDRO-STAR 300 5/05 June 1976 93 Safe Flying No Accident
Edition: Model Aviation - 1976/06
Page Numbers: 47, 48, 49, 93
WELCOME BACK Combat fans Take some time off bashing airplanes look over latest foam-wing Combat airplanes Combat has around quite awhile Combat planes tend very similar Bumble bee II wraps typical wing stabila tor around new practical foam wing structure result 18 oz machine can fly best balsa ships Bumblebee developed out necessity hate framing up wings love try new designs foam wing much easier quicker build conventional wing An added advantage balsa prices soaring lately Bum blebee considerably cheaper build often very important factor usually plan have least two planes contest care too easy wipe out plane match two six eight planes build big difference between ten bucks balsa kit four Bumblebee costs BumbbBee Mk1 U Bumblebee requires different build ing techniques balsa ship fin ishing done before final assembly cant hold over head make air plane noises soon once prelimi naries done whole thing falls together less hour couple words about adhesives finishing materials Styrofoam may have heard rather finicky stuff Model cement dope polyester resin will rapidly melt big holes Use epoxy glues water-based glues such aliphatic resin types like Titebond Use water-based glue spars trail ing edge ribs Use epoxy either alone mixed microballoons final assembly covering pretty impor tant best procedure two step pro cess First cover cores before final assembly Silkspan applied wall paper paste After assembling wing cover Solarfilm conventional way pinch Silkspan can skip ped helps stiffen wing slightly isnt absolutely necessary Begin construction cutting wing cores suggest get touch someone havent done before Wing cutting easy demonstrate pretty complicated describe use sim ple spring-loaded cutting bow strung 008 solid control-line wire model train transformer supplies electricity about amp 12 volts Carefully cut tem plates /8 ply Sand edges very smooth make sure templates symmetrical lay piece paper trace around Flip template Fast Combat design featuring foam wing construction Phil Cartier over see outlines match little judicious use sanding block will make templates exactly symmetrical Dont worry templates slightly different what plan shows Other fairly blunt leading edge isnt anything critical about airfoil important make symmetrical Drill couple holes template finishing nails will help hold template foam during cutting spar slots cut after cutting cores can use hot wire extra set templates else just sand shape sanding block Check fit spars slots should snug flush surface foam Carefully mark cut slots leading edge spar main spar joiner trailing edge spar Also recess foam root right panel center rib motor mount left panel recessed ahead spar motor mount An X-Acto saw thin sharp knife best tool making cuts Glue tip ribs center rib main spars trailing edges place Titebond Masking tape will hold everything place glue dries motor mount stabilator assem bly standard Combat items just few things note motor mount laminated three pieces /s balsa outer plys have vertical grain center ply has horizontal grain center ply also has stub inter locks center rib spar joiner Glue motor mount part together epoxy allow dry Drill hole dowel pin motor mounting bolts saw mounts final shape make slots leading edge joiner bellcrank mount stabilator made usual way Make sure hinge pins set back leading edge shown June 1976 Above Except foam wing ship con ventional author finds wing quicker easier build six eight ships man ages saving six dollars over balsa Below Fox Schneurle penbladder being filled Pinch-off EK product Bumblebee Mk II necessary because 2 bellcrank doesnt have enough leverage some aero dynamic balance Also reinforce hinges booms layer fiberglass over hinge pins under control horn around booms just behind cut-out wing using bass booms also fiberglass tips booms before drilling holes hinges Start finishing cores sanding off lumps excess balsa #100 sand paper Use large sanding block light pressure avoid tearing foam Sand cores smooth #150 paper #220 paper Cover cores Silkspan Use four pieces top bot tom panel Use wallpaper paste hold Silkspan Follow directions package mixing apply liberal amount styrofoam Smooth dampened Silkspan place allow dry Sand #220 paper remove ridges rough spots Make up pen bladder compartment BT-55 rocket body Block end bulkhead balsa Fuel-proof couple coats dope Make hole right-hand panel hold fuel compartment /i sink drain tube hardware store has just right diameter job Epoxy fuel com partment place Preassemble plane glue check fit parts joints should tight easy slip fit Sand cores spar joiners other pieces necessary get smooth joints satis fied parts fit properly mix up one-ounce batch slow-drying epoxy such Hobby Poxy II Blend equal vol ume microballoons reduces density epoxy helps fill gaps joints Use leading edge spar spreader work glue spar slots foam joints gen erous Just take care excess wont freeze bellcrank pushrod dries Thread leadouts through left coreandslide thejoiner/bellcrank assembly place Add trailing edge spar motor mount leading edge Slide right panel onto spars push wing panels together firmly Wipe off excess glue check alignment parts before glue sets Some pitfalls watch out Make sure parts ready final assembly before mixing glue Dont forget pushrod sure keep glue off bellcrank pushrod Cover wings before adding booms usually use Solarfilm other plastics will adhere low temperature Unfortunately Monokote requires too high temperature melts foam super cheap covering consists layer fabric such Mid wests Microlon nylon applied wallpaper paste finished two three coats polyurethane varnish Glue /s eyelets left tip lead out guides Finish ofT ends leadouts method diagrammed rule book control lines will also work well leadouts Epoxy tip weight right tip didnt earlier Carve pod shape reinforce fiber glass Poke some holes covering booms go epoxy place Flying easiest part Just make sure no obvious warps Look ALL WOOD MEIt BALSA UNLESS OTHERWISE NOTED MAIN SPAR JOINER 1/SINHARD BALSA OR SIG LITE PLY BO OMS 3/16 INBASSWOOD CENTER RIB /8 IN HARD BALSA MOTOR MOUNT DOUBLER 118 IN HARD BALSA I/ SHEET 1/8 BIRCH DOWEL PIN. 2 IN NYLON BELLC RANK 3/8 SQ MAPLE xY EYELET LEADOUTMOTOR MOUNTS BEND PUSHROE 0 0 4/40 BLIND NUTS4L 7 -- - 7 HOLLOW LEA WITH HOT I/ 7-7----- 7---K- 448 Model Aviation rear plane arms length wing opposite direction ironing outermost hole two bellcrank away Gradually tilt nose up down covering makes controls considerably quicker Since rear portion airfoil flat Set up controls pushrod other designs After youve gotthe trailing edge will block rest the outermost hole control horn ten feel plane pushrod can wing view no warps seasoned flier recoin- moved during trimming out Remove warps gently twisting mend starting out pushrod the continued page 93 LEADING EDGE SPAR 1/2 SHEET GUSSET IPERTIGRE G21 SHOWN --BT-55 ROCKET BODY SPAR LOCATION-GROOVE FOAM FOR SPARS AFTER CUTTINGOORES MW FIBERGLASS OVER HINGE PINS AND BUMBLEBEE II DESIGNED AND DRAWN BY S SHOWN COUPLER0I23456 10/75 / ON C/LI/I6 MW PUSHROD June 1976 49 Burn ble Bee/Ca rtie r continued page 49 flying field check everything once again fire up Take couple level laps everything seems okay try couple large ioops figure-eights Warps will show up decrease line tension during maneuvers lines get light during inside loops plane has left-rolling warp Light lines during outside loop mean right-rolling warp warps show up take out before flying again Warps can make Combat plane very hairy fly Check tip weight watching plane carefully during some tight figureeights should remain square lines never show top bottom wing during maneuvers Too little tip weight will make plane bank during maneuvers Too much will make bank out Add subtract tip weight until plane doesnt bank during maneuvers rest trimming done ad justing stab movement position balance point Increase stab travel move balance point back make plane responsive too touchy controls use heavier en gine cut down movement stab highly personal thing Some peo ple like very responsive meaning hairtrigger controls Others like smoother less sensitive controls So dont afraid experiment find out what suits Combat article always has some speed performance claims wont make Use Supertigre G21 Fox Schneurle Use 8/8 prop much nitro pocketbook can stand 20% nitro youll probably spend much time repairing engines building planes Last least join MACA Miniature Aircraft Combat Assoc Combat flier Send name address along check money order $500 Tom Southern 2207 Paul Longview TX 75601 MACA puts out dynamite newsletter latest Com bat news happenings Demonstrating right way launch combat shiptake step let fly out hands FF Duration/Meuser continued page 41 Young Regan added turbulator spars shown options Starduster X plans increased widths floats 3/8 added stability water Sal recommends models tipping scales anything over 6-oz mark Sproing need spring prop tensioner timer auto-start Nordic autorudder whatever find cigar box labeled springs assorted Inside find 436 springs ball-point pen refills spring front suspension 1941 Buick nothing between Get out hand drill clamp vise stick nail chuck lash piece wire chuck somehow crank away Half hour later have lacerations abra sions contusions rather wobbly looking spring Entertah-daaa KVG r Little Gem Handy Dandy Spring Winder KVG consists a thick wash er serves place anchor wire handle foundation b four music-wire mandrels 032 076 diameter upon springs may wound c winder bar latter has oversize hole slips over mandrel choice adjusting screw lock-nut makes fit mandrel anyhow hardened steel finger presses loose end wire against mandrel Getting thing started bit tricky once spring started just twist away winder bar out comes perfectly uniform tightly coiled springonly slightly largerthan mandrel greatest problem run out wire Its darned much fun making silly things running out wire could blessing disguise lots wire could starve death Basically machine makes tension spring compression spring what after simply stretch tension HYDRO-STAR 300 5/05 June 1976 93 Safe Flying No Accident
Edition: Model Aviation - 1976/06
Page Numbers: 47, 48, 49, 93
WELCOME BACK Combat fans Take some time off bashing airplanes look over latest foam-wing Combat airplanes Combat has around quite awhile Combat planes tend very similar Bumble bee II wraps typical wing stabila tor around new practical foam wing structure result 18 oz machine can fly best balsa ships Bumblebee developed out necessity hate framing up wings love try new designs foam wing much easier quicker build conventional wing An added advantage balsa prices soaring lately Bum blebee considerably cheaper build often very important factor usually plan have least two planes contest care too easy wipe out plane match two six eight planes build big difference between ten bucks balsa kit four Bumblebee costs BumbbBee Mk1 U Bumblebee requires different build ing techniques balsa ship fin ishing done before final assembly cant hold over head make air plane noises soon once prelimi naries done whole thing falls together less hour couple words about adhesives finishing materials Styrofoam may have heard rather finicky stuff Model cement dope polyester resin will rapidly melt big holes Use epoxy glues water-based glues such aliphatic resin types like Titebond Use water-based glue spars trail ing edge ribs Use epoxy either alone mixed microballoons final assembly covering pretty impor tant best procedure two step pro cess First cover cores before final assembly Silkspan applied wall paper paste After assembling wing cover Solarfilm conventional way pinch Silkspan can skip ped helps stiffen wing slightly isnt absolutely necessary Begin construction cutting wing cores suggest get touch someone havent done before Wing cutting easy demonstrate pretty complicated describe use sim ple spring-loaded cutting bow strung 008 solid control-line wire model train transformer supplies electricity about amp 12 volts Carefully cut tem plates /8 ply Sand edges very smooth make sure templates symmetrical lay piece paper trace around Flip template Fast Combat design featuring foam wing construction Phil Cartier over see outlines match little judicious use sanding block will make templates exactly symmetrical Dont worry templates slightly different what plan shows Other fairly blunt leading edge isnt anything critical about airfoil important make symmetrical Drill couple holes template finishing nails will help hold template foam during cutting spar slots cut after cutting cores can use hot wire extra set templates else just sand shape sanding block Check fit spars slots should snug flush surface foam Carefully mark cut slots leading edge spar main spar joiner trailing edge spar Also recess foam root right panel center rib motor mount left panel recessed ahead spar motor mount An X-Acto saw thin sharp knife best tool making cuts Glue tip ribs center rib main spars trailing edges place Titebond Masking tape will hold everything place glue dries motor mount stabilator assem bly standard Combat items just few things note motor mount laminated three pieces /s balsa outer plys have vertical grain center ply has horizontal grain center ply also has stub inter locks center rib spar joiner Glue motor mount part together epoxy allow dry Drill hole dowel pin motor mounting bolts saw mounts final shape make slots leading edge joiner bellcrank mount stabilator made usual way Make sure hinge pins set back leading edge shown June 1976 Above Except foam wing ship con ventional author finds wing quicker easier build six eight ships man ages saving six dollars over balsa Below Fox Schneurle penbladder being filled Pinch-off EK product Bumblebee Mk II necessary because 2 bellcrank doesnt have enough leverage some aero dynamic balance Also reinforce hinges booms layer fiberglass over hinge pins under control horn around booms just behind cut-out wing using bass booms also fiberglass tips booms before drilling holes hinges Start finishing cores sanding off lumps excess balsa #100 sand paper Use large sanding block light pressure avoid tearing foam Sand cores smooth #150 paper #220 paper Cover cores Silkspan Use four pieces top bot tom panel Use wallpaper paste hold Silkspan Follow directions package mixing apply liberal amount styrofoam Smooth dampened Silkspan place allow dry Sand #220 paper remove ridges rough spots Make up pen bladder compartment BT-55 rocket body Block end bulkhead balsa Fuel-proof couple coats dope Make hole right-hand panel hold fuel compartment /i sink drain tube hardware store has just right diameter job Epoxy fuel com partment place Preassemble plane glue check fit parts joints should tight easy slip fit Sand cores spar joiners other pieces necessary get smooth joints satis fied parts fit properly mix up one-ounce batch slow-drying epoxy such Hobby Poxy II Blend equal vol ume microballoons reduces density epoxy helps fill gaps joints Use leading edge spar spreader work glue spar slots foam joints gen erous Just take care excess wont freeze bellcrank pushrod dries Thread leadouts through left coreandslide thejoiner/bellcrank assembly place Add trailing edge spar motor mount leading edge Slide right panel onto spars push wing panels together firmly Wipe off excess glue check alignment parts before glue sets Some pitfalls watch out Make sure parts ready final assembly before mixing glue Dont forget pushrod sure keep glue off bellcrank pushrod Cover wings before adding booms usually use Solarfilm other plastics will adhere low temperature Unfortunately Monokote requires too high temperature melts foam super cheap covering consists layer fabric such Mid wests Microlon nylon applied wallpaper paste finished two three coats polyurethane varnish Glue /s eyelets left tip lead out guides Finish ofT ends leadouts method diagrammed rule book control lines will also work well leadouts Epoxy tip weight right tip didnt earlier Carve pod shape reinforce fiber glass Poke some holes covering booms go epoxy place Flying easiest part Just make sure no obvious warps Look ALL WOOD MEIt BALSA UNLESS OTHERWISE NOTED MAIN SPAR JOINER 1/SINHARD BALSA OR SIG LITE PLY BO OMS 3/16 INBASSWOOD CENTER RIB /8 IN HARD BALSA MOTOR MOUNT DOUBLER 118 IN HARD BALSA I/ SHEET 1/8 BIRCH DOWEL PIN. 2 IN NYLON BELLC RANK 3/8 SQ MAPLE xY EYELET LEADOUTMOTOR MOUNTS BEND PUSHROE 0 0 4/40 BLIND NUTS4L 7 -- - 7 HOLLOW LEA WITH HOT I/ 7-7----- 7---K- 448 Model Aviation rear plane arms length wing opposite direction ironing outermost hole two bellcrank away Gradually tilt nose up down covering makes controls considerably quicker Since rear portion airfoil flat Set up controls pushrod other designs After youve gotthe trailing edge will block rest the outermost hole control horn ten feel plane pushrod can wing view no warps seasoned flier recoin- moved during trimming out Remove warps gently twisting mend starting out pushrod the continued page 93 LEADING EDGE SPAR 1/2 SHEET GUSSET IPERTIGRE G21 SHOWN --BT-55 ROCKET BODY SPAR LOCATION-GROOVE FOAM FOR SPARS AFTER CUTTINGOORES MW FIBERGLASS OVER HINGE PINS AND BUMBLEBEE II DESIGNED AND DRAWN BY S SHOWN COUPLER0I23456 10/75 / ON C/LI/I6 MW PUSHROD June 1976 49 Burn ble Bee/Ca rtie r continued page 49 flying field check everything once again fire up Take couple level laps everything seems okay try couple large ioops figure-eights Warps will show up decrease line tension during maneuvers lines get light during inside loops plane has left-rolling warp Light lines during outside loop mean right-rolling warp warps show up take out before flying again Warps can make Combat plane very hairy fly Check tip weight watching plane carefully during some tight figureeights should remain square lines never show top bottom wing during maneuvers Too little tip weight will make plane bank during maneuvers Too much will make bank out Add subtract tip weight until plane doesnt bank during maneuvers rest trimming done ad justing stab movement position balance point Increase stab travel move balance point back make plane responsive too touchy controls use heavier en gine cut down movement stab highly personal thing Some peo ple like very responsive meaning hairtrigger controls Others like smoother less sensitive controls So dont afraid experiment find out what suits Combat article always has some speed performance claims wont make Use Supertigre G21 Fox Schneurle Use 8/8 prop much nitro pocketbook can stand 20% nitro youll probably spend much time repairing engines building planes Last least join MACA Miniature Aircraft Combat Assoc Combat flier Send name address along check money order $500 Tom Southern 2207 Paul Longview TX 75601 MACA puts out dynamite newsletter latest Com bat news happenings Demonstrating right way launch combat shiptake step let fly out hands FF Duration/Meuser continued page 41 Young Regan added turbulator spars shown options Starduster X plans increased widths floats 3/8 added stability water Sal recommends models tipping scales anything over 6-oz mark Sproing need spring prop tensioner timer auto-start Nordic autorudder whatever find cigar box labeled springs assorted Inside find 436 springs ball-point pen refills spring front suspension 1941 Buick nothing between Get out hand drill clamp vise stick nail chuck lash piece wire chuck somehow crank away Half hour later have lacerations abra sions contusions rather wobbly looking spring Entertah-daaa KVG r Little Gem Handy Dandy Spring Winder KVG consists a thick wash er serves place anchor wire handle foundation b four music-wire mandrels 032 076 diameter upon springs may wound c winder bar latter has oversize hole slips over mandrel choice adjusting screw lock-nut makes fit mandrel anyhow hardened steel finger presses loose end wire against mandrel Getting thing started bit tricky once spring started just twist away winder bar out comes perfectly uniform tightly coiled springonly slightly largerthan mandrel greatest problem run out wire Its darned much fun making silly things running out wire could blessing disguise lots wire could starve death Basically machine makes tension spring compression spring what after simply stretch tension HYDRO-STAR 300 5/05 June 1976 93 Safe Flying No Accident