UNLIMITED RUBBER event seems frighten away competitive modelers several theories apprehension may adduced perhaps valid ones center around difficulty carving efficient propeller ob taining adequate good quality rubber Presuming two concerns have de terred readers article building unlimited ship assured problems can surmount ed case propeller pre carved version folding hardware attached available Sig Manufac turing Co Inc Likewise rubber quality performance necessary can procured either Sig FAI Model Supply opinion author unlimited rubber offers unique opportunity original design construction theories class almost totally unfettered rules restricting design power limitation set forth current AMA rules wing area exceed 300 sq projected Any amount rubber power allowed no motor run limits established landing gear re quired result flexibility has allowed performance judgment exceed other free-flight class readers have seen high-perfor mance unlimited rubber model climb incredible height fold its prop settle flat floating glide have missed truly rewarding sights free flight world inducement modelers may neophytes unlimited rubber let assure Big Boy built ad justed according plans can climb higher almost free-flight gas model competition today particularly now VTO engine run differentials have eliminated So seek additional free-flight event desire build model truly superior free-flight duration potential per haps Big Boy may Construction Stabilizer Begin construction inJLJ U Few people know what duration Unlimited rubber job dead airthis climbs higher almost gas job stabilizer can covered doped cured before test flights tempted Use contest grade balsa ribs trailing edge tips keep down weight Assemble parts true flat surface adding 1/16 X 1/8 spruce D-T hooks last operation stabilizer should carefully sanded covered tissue tip plates should added before tissue water sprayed given least three coats thinned dope normally prefer nitrate butyrate dope because appears resistant moisture changes air completed stabilizer should absolutely free warps Finished weight should exceed 8 grams Wing Next construction sequence wing straightforward should present few building problems Select wood wing tips care should kept light pos sible two inboard wing panels ribs should cut 1/32 quarter-grain stock trailing edges preferably carved similar 1/8 sheet balsa During assembly front trailing edge should packed up conform airfoil shown plan Assemble wing panels poly hedral dimensions indicated using liberal amounts glue joints ce ment spars ribs polyhedral breaks until panels blocked up prop er angles Install plywood gusset triangular reinforcements shown Carve wing tips soft 3/8 sheet sand entire completed structure carefully facilitate attractive covering job Cover entire wing good quality tissue As stabilizer apply least three coats nitrate dope right board wing panel should have 1/8 washin helps keep right wing up during initial power burst turbulator string should installed shown See airfoil side view Experience has dem onstrated its effectiveness May1977 45 William H Langenberg authors model displays long fuselage high aspect ratio wings typical Unlimited rubber jobs wing must exceed 300 sq inof area Any amount rubber permissible no motor run limits exist landing gear required spells performance RIBS IOjSMRS I/IeX I/3 BALSA WING BENEDEK B I/32 PLYOO GUSSETj I i LI III / I II II~iI VIB SHEET GUSSET TYP USXI/B LE mRS I/U5 1/IrBA iiLFI71ZiZ2 KIr 41 LL V4 S/6 TRAILSIG EDGE I/StS IM5ORCEMENT BOTTOM NOTEe pxwooo NosE FORMERI I/B RT THRUSTISTABILIZER W4 sr em I/B SHEET 5 ITYP3 N y/\\~//\y/f/ 1/32 PIXWOOO GUSSET CENTER SECTION ITURBULATOR 30 LB TEST DACR0I~NN 13/rxIS/BxI/Ir I/IS NEETBALSACWIAINI1/Ir S _____TIE BOTHFS NOTE BALIRCE POINT AFT OI LEN I/IS WINO PLATFORM I/IrS I/V SPRUCE TIE BOTH SIDES Ot1IMERLHF1 iUS r ir II Ijfr5ITYR9 ~ / v-xv \/\v/\\/\//\s/ F [REAR SIDESIDE multi-spar wing Set wing aside allow cure thoroughly Finished weight should exceed 32 grams Fin fin cut soft 3/32 sheet outline shown plans should carved sanded streamline shape indicated give left turn glide Fuselage Select four bard X /8 balsa strips 48 long longerons 48in length stock available 36 strips can used properly spliced splicing use -l long bevel carefully fitted double glue joints locate splices same dis tance along fuselage length best position splice junction two diagonals act reinforcing mem bers Build two fuselage sides plan en suring diagonals run same directions both sides Add sheet fillers rear rubber peg prudent dope both flat sides 1/16 X 1/8 diagonals before cutting size rubber lube will ab sorbed raw wood longerons should also doped before building fuselage sides joining fuselage sides nor mally tack glue X cross pieces longerons about 12 set up fuselage shape throughout length square section insert X 1/16 diagonals proceeding equally along top bottom tack glued ieces removed diagonals take places prefer simple jig can construct ed facilitate fuselage assembly Add sheet balsa fillers front fuselage glue remainder diagonals place Insert 1 / 16 sheet reinforcing pieces inside rear motor hook section indicated plan Now 46 Model Aviation S V x timer pop-Up stabilizer dethermalizer conveniently located side pylon attention directed ttirbulator thread plansaft leading edge SX S/ LEAVING EDGE I/B 34 fIT GUSSET ITYPI zIIv1_iZLrizfZIZI_Lii_Vizii iZIZiLi7iZIzIzzF1Z AA LLI iIIi[iIiIiIiIIiIiIIi ZIZELII vvI II_I LL KU IZIZ[ILIIILIIIZIZII 111_I_IILIIIIILJZ LULLI1 114 I 111L L III I 1 ttI~~A Nv1132 RIBS 10C SHEET GUSSET ITYP TP PLATE V16 SHEET DRAiNPDING PROP HINGE S PLATE VERT WRAP WrTH GLASS TAPE S EPOXY BE WASHER HARD BALSA NOSE BLOCS /B PLYWOOD ______ THRUST BEAR NO 6 0 PLASTIC TUBINGI 114 r__ lB MUS C WIREPROP P0105 HORIZONTALlY /16 W RE PROP STUP HODIC & HARDWARE PA MDGEL SUPPLY P0 BOX STYB PHOENIX ARIZ 05058 ml 301 UNLIMITED RUBOER MODEL DEBONED 510 DRABS BY WILLIAM R LANGENBERG jTRACED 312 INKED BY CLIFFORG FOR JR rYOP SIOE/BOTTOM SIDE I/BX I/V LONGERONS ffI/MX I/B CROSS BRACES I/4ALIM YIJmNOX I RUOCERI/IVX I/V SPRUCED HOOKS IS ,w masw. TIP PLATE I/IV SHEET GRAIN VERY —I /\\ //\\ //\\\\\g\\iji \ If\ /-L4VTUUING \v/ \VI \v/\Ii/ky1\\// \\I/ HEET DI2342S //\$k\\\\~~ f //\\ /f\\ //\\ //\\ 4 4k ~\\ flJH I// k/\\//\\/\\/\\/I\\//\\//IIIIL \\\J\v/V/\//\Y/\\//111111Il FI/1B SHEETY7 ELABE IWITH TIMER4BTOP SECTION UNCOAERED IWINO55 IPROPELLER B NOSE BLOOC54hr SHEET GRANd VERY STABIUZERB RIflER110I/16 ALUMINUM TUENG II/V PLYWObO INSERT IIIVALUMINUM TUBINGL44 ALUMINUM TUENO AI/VX I/V LONGERWIS [v32][b-1-10-1-10]] carve sand /8 right thrust fuselage nose Cut out 1/16 ply wood nose former glue accurately place Sand entire fuselage smooth cover tissue grain perpendicular longerons durability may wish double cover fuselage bottom cross graining tissue finish fuselage cut out wing mounts plus stab wing platforms Glue fuselage shown add 1 / 16-in aluminum tubing D-T line guides 1 / 16 dowel rubber hook Finish assembly gluing rudder fuselage ensuring prop erly aligned elect use D-T w -J -J Ci z -J 0 w N -J -J LA timer should positioned shown Finished weight completed fuselage assembly should exceed 48 grams cluding D-T timer Propdler Two alternative propeller semblies shown model photographs uses Sig 24-in pre-built folding propeller blades trimmed outline shown An alternative propeller experienced energetic modelers de sire carve own also detailed theplan isa24 X 24 version should have about 1/16 undercamber blades have used both type props Big Boy no significant changes performance elect carve propeller first select straight grained 1 X 2 X 24-in balsa block Drill center hole saw blank shape Carve undercam bered sides sand smooth ensur ing two blades symmetrical carve away back sides prop until blades about 3/32 thick mid-point Finally shape blades finished outline hinge plate shown plan made 1/32 brass sheet short continued page 99 May1977 47 SOVY 3B SHEET7 \LIMx S/B TRAIUNG EDGE NOTO4 I/16X VB SPRUCE DY HOOKS w 0 w w Cd I/IV SHEET PILLERJ / I/IBALUMINUU TUUNG \ I/V DOWEL propellBr Shown pictures Sig 24-in pre-built folder blades trimmed outlines Shown plan wish hack own plans show 24 24-in pitch have run across An added advantage method adds very little drag next column will bring up topic moveable leadouts Richard L Perry 5016 Angelita Ave. Dayton OH 45424 FF Duration/Meuser continued page 44 Models Peck Heck Peck-Poly mers long famous its free flight scale sport kits plans hardware now heavily CO-2 power Peck stocks Brown single twin new Telco Shark motors Nite 16 kit built-up 16-span sport model now includes instructions converting CO-2 power can converted back rubber power minute two great interest CO-2 enthusiasts tanks offered Peck five sizes rang ing teeny l/4 cc 20 cc capacity too Peck offers goodie adapts Ansul fire-extinguisher cartridges three brands CO-2 motors provides flights fraction cost using small cartridges usually used Send Pecks complete catalog P0 Box 2498 La Mesa CA 92041 HLG Dethermalizer Four types have used varying degrees success dropping nose weight pop-up elevator spin-tab Geraghty system latter consists no DT lots gliders pop-up elevator type perfect ed Bill Blanchard seems increas ing popularity new twist old spin-tab device submitted Mark Drela fliers have abandoned spintab DT since tends produce screaming spiral dives defeats original pur pose bring glider down safely version spin-tab system destruc tion model avoided placing tab outside glide circle instead glide circle tightening suicidal spiral dive glide circle either opens up reverses glide path angle steepens about 30-degree angle horizontal nearly straight flight path moderately rapid descent model simply punches through strongest thermals hitching ride next county Other types DT-s have known ineffective strong thermals tab cut 010 brass 015 aluminum sheet 2 2 long glide angle sensitive width bottom flange can trimmed achieve desired angle descent some cases completely removed Turn ing effect can adjusted trimming Aol 1ffSolal 61DMFilm HOT FUEL PROOF DOPEEXCLUSIVE LOW-HEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel pruuf tweight 51flC17 Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 length tab altering opening angle Sounds like its worth try HLG DT systems use fuses course common cause malfunction caused rub ber band pressing too tightly against fuse what worse pressing fuse against heat-robbing piece metal force rubberband should supported something other fuse such way presses lightly against fuse Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about MA Big Boy/Langenberg continued page 47 length 1/32-in ID brass tubing rolled epoxied end 1/32 hinge wire connects blades hub Complete propeller assembly carving noseblock hard balsa ball bearings shaft thrust bearing spring shown drawing can obtained FAT Model Supply Box 9778 Phoenix AZ 85068 1/8 plywood insert glued rear nose block should fit snugly front fuseMay1977 99 / THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Custom Blended Bill Hager 5214 N Dixie Drive Dayton Ohio 45414 lage propeller nose block should given least three coats dope before assembling Ensure propeller blades properly balanced track properly Finished weight propeller assembly should exceed 24 grams Flight Preparation Make up least two /4 rubber motors 16 strands After washing drying lubing motors break initially using stationary stretch method hammer two large nails securely fence about six motor lengths apart motor stretched over nails left live minutes stretched motors should about 42 long Now assemble completed model insert rubber motor Check align ment wing wash-in incidence thrust correct Also verify CG loca tion prop blades folded Shift posi tion D-T timer necessary ensure CG located precisely shown plan Ready fly weight should equal less 222-gram total itemized plan modeler interested serious un limited rubber competition believe re liable sturdy winder winding stooge musts winding stooge custom de signed own car relatively easy build twin advantages im movable holder winding freedom test fly alone significant Flying Under calm conditions hand glide model add packing under sta bilizer leading trailing edge until GM Fuel Dayton Nationals model floats just slight left turn ship should very docile adjust under power Start about 200 turns model should climb right straighten out before prop folds glide left Use thrust adjust ments rudder tab stab tilt obtain pattern Proceed increments until full turns reached Under full power model should climb steep right corkscrew nose pointed up until just before prop folds Motor run should about minute advantages unlimited rubber class duration potential exceeds flight maximum unless down air encountered Unlike Wakefield therefore believe mandatory wind motor absolute capacity flight normally wind motors Big Boy between 700-750 turns depending feel rubber Maximum capacity contrast about 800 turns Sig FAI Model Supply rubber opin ion equivalent Pirelli Wake field events certainly adequate Big Boy Because its smooth texture also less liable nick break several occasions have used same motor three competitive flights unable build Big Boy down structural weight shown plan climb suffers accordingly suggest increase power 16 18 strands real joys un limited rubber event watch model climb great height may unless thermal assisted under powered Try unlimited rubberyoull like Fancy Pants/Margolin continued page 40 exhibited same smooth characteris tics Just sure ship balanced indicated plans little nose weight desirable can go heavier gauge aluminum landing gear plenty fuelproofing engine com partment usually will put balance ball park Lots fun building flying R ockette/J enki ns continued page 57 intended protect leading edge nicks dents Also gluing balsa leading edge gives chance straighten out warps have straight leading edge work sand shape leading edge before gluing framework gether keep putting stress 1/32 ribs Rockettes leading edge sanded sharper angle other air foils have seen seems give slight turbulator effect keep wing light 1/32 ribs used except three center ribs dihedral ribs 1/16 strength building block up trailing edge 1/32 50 will better follow line undercamber Glue ribs leading trailing edges insert top spars dry turn frame work over glue bottom spar may seem unusual bottom spar lie flat always have trouble getting tissue follow undercamber gives tissue surface ad make wing tip allow spars extend past last rib about /8 sand off angle capping wing tips light sheet 1/32 Sand airfoil shape finished tips before gluing dihedral joints because easier han dle tip itself dihedral joint made sanding ends center Tageriet Engines Similar familiar Jetex engines Japanese engines imported Canadian distributor Type equiva lent Jetex 50 Type B Jetex 150 Prices Type $650 Type B $850 Fuel 10 pellets Type $350 6 pellets Type B $350 Academy Products Ltd 51 Millwick Dr Weston Ont Canada 100 Model Aviation 5% nitro $650 gallon 10% nitro $725 gallon 15% nitro -$800 gallon 54 gallon drum 15% $21954 HARRYS HOBBIES WE SHIP FREE WITH 100 GALLON ORDER ooductreviewproduetreviewproduvtrviewproductreview COX ENGINES COX/SANWA RIC SYSTEMS AIRTRONICS KITS Send Complete Catalog 1525 E Warner Ave Santa Ana CA 92702 HOBBIES
Edition: Model Aviation - 1977/05
Page Numbers: 45, 46, 47, 99, 100
UNLIMITED RUBBER event seems frighten away competitive modelers several theories apprehension may adduced perhaps valid ones center around difficulty carving efficient propeller ob taining adequate good quality rubber Presuming two concerns have de terred readers article building unlimited ship assured problems can surmount ed case propeller pre carved version folding hardware attached available Sig Manufac turing Co Inc Likewise rubber quality performance necessary can procured either Sig FAI Model Supply opinion author unlimited rubber offers unique opportunity original design construction theories class almost totally unfettered rules restricting design power limitation set forth current AMA rules wing area exceed 300 sq projected Any amount rubber power allowed no motor run limits established landing gear re quired result flexibility has allowed performance judgment exceed other free-flight class readers have seen high-perfor mance unlimited rubber model climb incredible height fold its prop settle flat floating glide have missed truly rewarding sights free flight world inducement modelers may neophytes unlimited rubber let assure Big Boy built ad justed according plans can climb higher almost free-flight gas model competition today particularly now VTO engine run differentials have eliminated So seek additional free-flight event desire build model truly superior free-flight duration potential per haps Big Boy may Construction Stabilizer Begin construction inJLJ U Few people know what duration Unlimited rubber job dead airthis climbs higher almost gas job stabilizer can covered doped cured before test flights tempted Use contest grade balsa ribs trailing edge tips keep down weight Assemble parts true flat surface adding 1/16 X 1/8 spruce D-T hooks last operation stabilizer should carefully sanded covered tissue tip plates should added before tissue water sprayed given least three coats thinned dope normally prefer nitrate butyrate dope because appears resistant moisture changes air completed stabilizer should absolutely free warps Finished weight should exceed 8 grams Wing Next construction sequence wing straightforward should present few building problems Select wood wing tips care should kept light pos sible two inboard wing panels ribs should cut 1/32 quarter-grain stock trailing edges preferably carved similar 1/8 sheet balsa During assembly front trailing edge should packed up conform airfoil shown plan Assemble wing panels poly hedral dimensions indicated using liberal amounts glue joints ce ment spars ribs polyhedral breaks until panels blocked up prop er angles Install plywood gusset triangular reinforcements shown Carve wing tips soft 3/8 sheet sand entire completed structure carefully facilitate attractive covering job Cover entire wing good quality tissue As stabilizer apply least three coats nitrate dope right board wing panel should have 1/8 washin helps keep right wing up during initial power burst turbulator string should installed shown See airfoil side view Experience has dem onstrated its effectiveness May1977 45 William H Langenberg authors model displays long fuselage high aspect ratio wings typical Unlimited rubber jobs wing must exceed 300 sq inof area Any amount rubber permissible no motor run limits exist landing gear required spells performance RIBS IOjSMRS I/IeX I/3 BALSA WING BENEDEK B I/32 PLYOO GUSSETj I i LI III / I II II~iI VIB SHEET GUSSET TYP USXI/B LE mRS I/U5 1/IrBA iiLFI71ZiZ2 KIr 41 LL V4 S/6 TRAILSIG EDGE I/StS IM5ORCEMENT BOTTOM NOTEe pxwooo NosE FORMERI I/B RT THRUSTISTABILIZER W4 sr em I/B SHEET 5 ITYP3 N y/\\~//\y/f/ 1/32 PIXWOOO GUSSET CENTER SECTION ITURBULATOR 30 LB TEST DACR0I~NN 13/rxIS/BxI/Ir I/IS NEETBALSACWIAINI1/Ir S _____TIE BOTHFS NOTE BALIRCE POINT AFT OI LEN I/IS WINO PLATFORM I/IrS I/V SPRUCE TIE BOTH SIDES Ot1IMERLHF1 iUS r ir II Ijfr5ITYR9 ~ / v-xv \/\v/\\/\//\s/ F [REAR SIDESIDE multi-spar wing Set wing aside allow cure thoroughly Finished weight should exceed 32 grams Fin fin cut soft 3/32 sheet outline shown plans should carved sanded streamline shape indicated give left turn glide Fuselage Select four bard X /8 balsa strips 48 long longerons 48in length stock available 36 strips can used properly spliced splicing use -l long bevel carefully fitted double glue joints locate splices same dis tance along fuselage length best position splice junction two diagonals act reinforcing mem bers Build two fuselage sides plan en suring diagonals run same directions both sides Add sheet fillers rear rubber peg prudent dope both flat sides 1/16 X 1/8 diagonals before cutting size rubber lube will ab sorbed raw wood longerons should also doped before building fuselage sides joining fuselage sides nor mally tack glue X cross pieces longerons about 12 set up fuselage shape throughout length square section insert X 1/16 diagonals proceeding equally along top bottom tack glued ieces removed diagonals take places prefer simple jig can construct ed facilitate fuselage assembly Add sheet balsa fillers front fuselage glue remainder diagonals place Insert 1 / 16 sheet reinforcing pieces inside rear motor hook section indicated plan Now 46 Model Aviation S V x timer pop-Up stabilizer dethermalizer conveniently located side pylon attention directed ttirbulator thread plansaft leading edge SX S/ LEAVING EDGE I/B 34 fIT GUSSET ITYPI zIIv1_iZLrizfZIZI_Lii_Vizii iZIZiLi7iZIzIzzF1Z AA LLI iIIi[iIiIiIiIIiIiIIi ZIZELII vvI II_I LL KU IZIZ[ILIIILIIIZIZII 111_I_IILIIIIILJZ LULLI1 114 I 111L L III I 1 ttI~~A Nv1132 RIBS 10C SHEET GUSSET ITYP TP PLATE V16 SHEET DRAiNPDING PROP HINGE S PLATE VERT WRAP WrTH GLASS TAPE S EPOXY BE WASHER HARD BALSA NOSE BLOCS /B PLYWOOD ______ THRUST BEAR NO 6 0 PLASTIC TUBINGI 114 r__ lB MUS C WIREPROP P0105 HORIZONTALlY /16 W RE PROP STUP HODIC & HARDWARE PA MDGEL SUPPLY P0 BOX STYB PHOENIX ARIZ 05058 ml 301 UNLIMITED RUBOER MODEL DEBONED 510 DRABS BY WILLIAM R LANGENBERG jTRACED 312 INKED BY CLIFFORG FOR JR rYOP SIOE/BOTTOM SIDE I/BX I/V LONGERONS ffI/MX I/B CROSS BRACES I/4ALIM YIJmNOX I RUOCERI/IVX I/V SPRUCED HOOKS IS ,w masw. TIP PLATE I/IV SHEET GRAIN VERY —I /\\ //\\ //\\\\\g\\iji \ If\ /-L4VTUUING \v/ \VI \v/\Ii/ky1\\// \\I/ HEET DI2342S //\$k\\\\~~ f //\\ /f\\ //\\ //\\ 4 4k ~\\ flJH I// k/\\//\\/\\/\\/I\\//\\//IIIIL \\\J\v/V/\//\Y/\\//111111Il FI/1B SHEETY7 ELABE IWITH TIMER4BTOP SECTION UNCOAERED IWINO55 IPROPELLER B NOSE BLOOC54hr SHEET GRANd VERY STABIUZERB RIflER110I/16 ALUMINUM TUENG II/V PLYWObO INSERT IIIVALUMINUM TUBINGL44 ALUMINUM TUENO AI/VX I/V LONGERWIS [v32][b-1-10-1-10]] carve sand /8 right thrust fuselage nose Cut out 1/16 ply wood nose former glue accurately place Sand entire fuselage smooth cover tissue grain perpendicular longerons durability may wish double cover fuselage bottom cross graining tissue finish fuselage cut out wing mounts plus stab wing platforms Glue fuselage shown add 1 / 16-in aluminum tubing D-T line guides 1 / 16 dowel rubber hook Finish assembly gluing rudder fuselage ensuring prop erly aligned elect use D-T w -J -J Ci z -J 0 w N -J -J LA timer should positioned shown Finished weight completed fuselage assembly should exceed 48 grams cluding D-T timer Propdler Two alternative propeller semblies shown model photographs uses Sig 24-in pre-built folding propeller blades trimmed outline shown An alternative propeller experienced energetic modelers de sire carve own also detailed theplan isa24 X 24 version should have about 1/16 undercamber blades have used both type props Big Boy no significant changes performance elect carve propeller first select straight grained 1 X 2 X 24-in balsa block Drill center hole saw blank shape Carve undercam bered sides sand smooth ensur ing two blades symmetrical carve away back sides prop until blades about 3/32 thick mid-point Finally shape blades finished outline hinge plate shown plan made 1/32 brass sheet short continued page 99 May1977 47 SOVY 3B SHEET7 \LIMx S/B TRAIUNG EDGE NOTO4 I/16X VB SPRUCE DY HOOKS w 0 w w Cd I/IV SHEET PILLERJ / I/IBALUMINUU TUUNG \ I/V DOWEL propellBr Shown pictures Sig 24-in pre-built folder blades trimmed outlines Shown plan wish hack own plans show 24 24-in pitch have run across An added advantage method adds very little drag next column will bring up topic moveable leadouts Richard L Perry 5016 Angelita Ave. Dayton OH 45424 FF Duration/Meuser continued page 44 Models Peck Heck Peck-Poly mers long famous its free flight scale sport kits plans hardware now heavily CO-2 power Peck stocks Brown single twin new Telco Shark motors Nite 16 kit built-up 16-span sport model now includes instructions converting CO-2 power can converted back rubber power minute two great interest CO-2 enthusiasts tanks offered Peck five sizes rang ing teeny l/4 cc 20 cc capacity too Peck offers goodie adapts Ansul fire-extinguisher cartridges three brands CO-2 motors provides flights fraction cost using small cartridges usually used Send Pecks complete catalog P0 Box 2498 La Mesa CA 92041 HLG Dethermalizer Four types have used varying degrees success dropping nose weight pop-up elevator spin-tab Geraghty system latter consists no DT lots gliders pop-up elevator type perfect ed Bill Blanchard seems increas ing popularity new twist old spin-tab device submitted Mark Drela fliers have abandoned spintab DT since tends produce screaming spiral dives defeats original pur pose bring glider down safely version spin-tab system destruc tion model avoided placing tab outside glide circle instead glide circle tightening suicidal spiral dive glide circle either opens up reverses glide path angle steepens about 30-degree angle horizontal nearly straight flight path moderately rapid descent model simply punches through strongest thermals hitching ride next county Other types DT-s have known ineffective strong thermals tab cut 010 brass 015 aluminum sheet 2 2 long glide angle sensitive width bottom flange can trimmed achieve desired angle descent some cases completely removed Turn ing effect can adjusted trimming Aol 1ffSolal 61DMFilm HOT FUEL PROOF DOPEEXCLUSIVE LOW-HEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel pruuf tweight 51flC17 Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 length tab altering opening angle Sounds like its worth try HLG DT systems use fuses course common cause malfunction caused rub ber band pressing too tightly against fuse what worse pressing fuse against heat-robbing piece metal force rubberband should supported something other fuse such way presses lightly against fuse Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about MA Big Boy/Langenberg continued page 47 length 1/32-in ID brass tubing rolled epoxied end 1/32 hinge wire connects blades hub Complete propeller assembly carving noseblock hard balsa ball bearings shaft thrust bearing spring shown drawing can obtained FAT Model Supply Box 9778 Phoenix AZ 85068 1/8 plywood insert glued rear nose block should fit snugly front fuseMay1977 99 / THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Custom Blended Bill Hager 5214 N Dixie Drive Dayton Ohio 45414 lage propeller nose block should given least three coats dope before assembling Ensure propeller blades properly balanced track properly Finished weight propeller assembly should exceed 24 grams Flight Preparation Make up least two /4 rubber motors 16 strands After washing drying lubing motors break initially using stationary stretch method hammer two large nails securely fence about six motor lengths apart motor stretched over nails left live minutes stretched motors should about 42 long Now assemble completed model insert rubber motor Check align ment wing wash-in incidence thrust correct Also verify CG loca tion prop blades folded Shift posi tion D-T timer necessary ensure CG located precisely shown plan Ready fly weight should equal less 222-gram total itemized plan modeler interested serious un limited rubber competition believe re liable sturdy winder winding stooge musts winding stooge custom de signed own car relatively easy build twin advantages im movable holder winding freedom test fly alone significant Flying Under calm conditions hand glide model add packing under sta bilizer leading trailing edge until GM Fuel Dayton Nationals model floats just slight left turn ship should very docile adjust under power Start about 200 turns model should climb right straighten out before prop folds glide left Use thrust adjust ments rudder tab stab tilt obtain pattern Proceed increments until full turns reached Under full power model should climb steep right corkscrew nose pointed up until just before prop folds Motor run should about minute advantages unlimited rubber class duration potential exceeds flight maximum unless down air encountered Unlike Wakefield therefore believe mandatory wind motor absolute capacity flight normally wind motors Big Boy between 700-750 turns depending feel rubber Maximum capacity contrast about 800 turns Sig FAI Model Supply rubber opin ion equivalent Pirelli Wake field events certainly adequate Big Boy Because its smooth texture also less liable nick break several occasions have used same motor three competitive flights unable build Big Boy down structural weight shown plan climb suffers accordingly suggest increase power 16 18 strands real joys un limited rubber event watch model climb great height may unless thermal assisted under powered Try unlimited rubberyoull like Fancy Pants/Margolin continued page 40 exhibited same smooth characteris tics Just sure ship balanced indicated plans little nose weight desirable can go heavier gauge aluminum landing gear plenty fuelproofing engine com partment usually will put balance ball park Lots fun building flying R ockette/J enki ns continued page 57 intended protect leading edge nicks dents Also gluing balsa leading edge gives chance straighten out warps have straight leading edge work sand shape leading edge before gluing framework gether keep putting stress 1/32 ribs Rockettes leading edge sanded sharper angle other air foils have seen seems give slight turbulator effect keep wing light 1/32 ribs used except three center ribs dihedral ribs 1/16 strength building block up trailing edge 1/32 50 will better follow line undercamber Glue ribs leading trailing edges insert top spars dry turn frame work over glue bottom spar may seem unusual bottom spar lie flat always have trouble getting tissue follow undercamber gives tissue surface ad make wing tip allow spars extend past last rib about /8 sand off angle capping wing tips light sheet 1/32 Sand airfoil shape finished tips before gluing dihedral joints because easier han dle tip itself dihedral joint made sanding ends center Tageriet Engines Similar familiar Jetex engines Japanese engines imported Canadian distributor Type equiva lent Jetex 50 Type B Jetex 150 Prices Type $650 Type B $850 Fuel 10 pellets Type $350 6 pellets Type B $350 Academy Products Ltd 51 Millwick Dr Weston Ont Canada 100 Model Aviation 5% nitro $650 gallon 10% nitro $725 gallon 15% nitro -$800 gallon 54 gallon drum 15% $21954 HARRYS HOBBIES WE SHIP FREE WITH 100 GALLON ORDER ooductreviewproduetreviewproduvtrviewproductreview COX ENGINES COX/SANWA RIC SYSTEMS AIRTRONICS KITS Send Complete Catalog 1525 E Warner Ave Santa Ana CA 92702 HOBBIES
Edition: Model Aviation - 1977/05
Page Numbers: 45, 46, 47, 99, 100
UNLIMITED RUBBER event seems frighten away competitive modelers several theories apprehension may adduced perhaps valid ones center around difficulty carving efficient propeller ob taining adequate good quality rubber Presuming two concerns have de terred readers article building unlimited ship assured problems can surmount ed case propeller pre carved version folding hardware attached available Sig Manufac turing Co Inc Likewise rubber quality performance necessary can procured either Sig FAI Model Supply opinion author unlimited rubber offers unique opportunity original design construction theories class almost totally unfettered rules restricting design power limitation set forth current AMA rules wing area exceed 300 sq projected Any amount rubber power allowed no motor run limits established landing gear re quired result flexibility has allowed performance judgment exceed other free-flight class readers have seen high-perfor mance unlimited rubber model climb incredible height fold its prop settle flat floating glide have missed truly rewarding sights free flight world inducement modelers may neophytes unlimited rubber let assure Big Boy built ad justed according plans can climb higher almost free-flight gas model competition today particularly now VTO engine run differentials have eliminated So seek additional free-flight event desire build model truly superior free-flight duration potential per haps Big Boy may Construction Stabilizer Begin construction inJLJ U Few people know what duration Unlimited rubber job dead airthis climbs higher almost gas job stabilizer can covered doped cured before test flights tempted Use contest grade balsa ribs trailing edge tips keep down weight Assemble parts true flat surface adding 1/16 X 1/8 spruce D-T hooks last operation stabilizer should carefully sanded covered tissue tip plates should added before tissue water sprayed given least three coats thinned dope normally prefer nitrate butyrate dope because appears resistant moisture changes air completed stabilizer should absolutely free warps Finished weight should exceed 8 grams Wing Next construction sequence wing straightforward should present few building problems Select wood wing tips care should kept light pos sible two inboard wing panels ribs should cut 1/32 quarter-grain stock trailing edges preferably carved similar 1/8 sheet balsa During assembly front trailing edge should packed up conform airfoil shown plan Assemble wing panels poly hedral dimensions indicated using liberal amounts glue joints ce ment spars ribs polyhedral breaks until panels blocked up prop er angles Install plywood gusset triangular reinforcements shown Carve wing tips soft 3/8 sheet sand entire completed structure carefully facilitate attractive covering job Cover entire wing good quality tissue As stabilizer apply least three coats nitrate dope right board wing panel should have 1/8 washin helps keep right wing up during initial power burst turbulator string should installed shown See airfoil side view Experience has dem onstrated its effectiveness May1977 45 William H Langenberg authors model displays long fuselage high aspect ratio wings typical Unlimited rubber jobs wing must exceed 300 sq inof area Any amount rubber permissible no motor run limits exist landing gear required spells performance RIBS IOjSMRS I/IeX I/3 BALSA WING BENEDEK B I/32 PLYOO GUSSETj I i LI III / I II II~iI VIB SHEET GUSSET TYP USXI/B LE mRS I/U5 1/IrBA iiLFI71ZiZ2 KIr 41 LL V4 S/6 TRAILSIG EDGE I/StS IM5ORCEMENT BOTTOM NOTEe pxwooo NosE FORMERI I/B RT THRUSTISTABILIZER W4 sr em I/B SHEET 5 ITYP3 N y/\\~//\y/f/ 1/32 PIXWOOO GUSSET CENTER SECTION ITURBULATOR 30 LB TEST DACR0I~NN 13/rxIS/BxI/Ir I/IS NEETBALSACWIAINI1/Ir S _____TIE BOTHFS NOTE BALIRCE POINT AFT OI LEN I/IS WINO PLATFORM I/IrS I/V SPRUCE TIE BOTH SIDES Ot1IMERLHF1 iUS r ir II Ijfr5ITYR9 ~ / v-xv \/\v/\\/\//\s/ F [REAR SIDESIDE multi-spar wing Set wing aside allow cure thoroughly Finished weight should exceed 32 grams Fin fin cut soft 3/32 sheet outline shown plans should carved sanded streamline shape indicated give left turn glide Fuselage Select four bard X /8 balsa strips 48 long longerons 48in length stock available 36 strips can used properly spliced splicing use -l long bevel carefully fitted double glue joints locate splices same dis tance along fuselage length best position splice junction two diagonals act reinforcing mem bers Build two fuselage sides plan en suring diagonals run same directions both sides Add sheet fillers rear rubber peg prudent dope both flat sides 1/16 X 1/8 diagonals before cutting size rubber lube will ab sorbed raw wood longerons should also doped before building fuselage sides joining fuselage sides nor mally tack glue X cross pieces longerons about 12 set up fuselage shape throughout length square section insert X 1/16 diagonals proceeding equally along top bottom tack glued ieces removed diagonals take places prefer simple jig can construct ed facilitate fuselage assembly Add sheet balsa fillers front fuselage glue remainder diagonals place Insert 1 / 16 sheet reinforcing pieces inside rear motor hook section indicated plan Now 46 Model Aviation S V x timer pop-Up stabilizer dethermalizer conveniently located side pylon attention directed ttirbulator thread plansaft leading edge SX S/ LEAVING EDGE I/B 34 fIT GUSSET ITYPI zIIv1_iZLrizfZIZI_Lii_Vizii iZIZiLi7iZIzIzzF1Z AA LLI iIIi[iIiIiIiIIiIiIIi ZIZELII vvI II_I LL KU IZIZ[ILIIILIIIZIZII 111_I_IILIIIIILJZ LULLI1 114 I 111L L III I 1 ttI~~A Nv1132 RIBS 10C SHEET GUSSET ITYP TP PLATE V16 SHEET DRAiNPDING PROP HINGE S PLATE VERT WRAP WrTH GLASS TAPE S EPOXY BE WASHER HARD BALSA NOSE BLOCS /B PLYWOOD ______ THRUST BEAR NO 6 0 PLASTIC TUBINGI 114 r__ lB MUS C WIREPROP P0105 HORIZONTALlY /16 W RE PROP STUP HODIC & HARDWARE PA MDGEL SUPPLY P0 BOX STYB PHOENIX ARIZ 05058 ml 301 UNLIMITED RUBOER MODEL DEBONED 510 DRABS BY WILLIAM R LANGENBERG jTRACED 312 INKED BY CLIFFORG FOR JR rYOP SIOE/BOTTOM SIDE I/BX I/V LONGERONS ffI/MX I/B CROSS BRACES I/4ALIM YIJmNOX I RUOCERI/IVX I/V SPRUCED HOOKS IS ,w masw. TIP PLATE I/IV SHEET GRAIN VERY —I /\\ //\\ //\\\\\g\\iji \ If\ /-L4VTUUING \v/ \VI \v/\Ii/ky1\\// \\I/ HEET DI2342S //\$k\\\\~~ f //\\ /f\\ //\\ //\\ 4 4k ~\\ flJH I// k/\\//\\/\\/\\/I\\//\\//IIIIL \\\J\v/V/\//\Y/\\//111111Il FI/1B SHEETY7 ELABE IWITH TIMER4BTOP SECTION UNCOAERED IWINO55 IPROPELLER B NOSE BLOOC54hr SHEET GRANd VERY STABIUZERB RIflER110I/16 ALUMINUM TUENG II/V PLYWObO INSERT IIIVALUMINUM TUBINGL44 ALUMINUM TUENO AI/VX I/V LONGERWIS [v32][b-1-10-1-10]] carve sand /8 right thrust fuselage nose Cut out 1/16 ply wood nose former glue accurately place Sand entire fuselage smooth cover tissue grain perpendicular longerons durability may wish double cover fuselage bottom cross graining tissue finish fuselage cut out wing mounts plus stab wing platforms Glue fuselage shown add 1 / 16-in aluminum tubing D-T line guides 1 / 16 dowel rubber hook Finish assembly gluing rudder fuselage ensuring prop erly aligned elect use D-T w -J -J Ci z -J 0 w N -J -J LA timer should positioned shown Finished weight completed fuselage assembly should exceed 48 grams cluding D-T timer Propdler Two alternative propeller semblies shown model photographs uses Sig 24-in pre-built folding propeller blades trimmed outline shown An alternative propeller experienced energetic modelers de sire carve own also detailed theplan isa24 X 24 version should have about 1/16 undercamber blades have used both type props Big Boy no significant changes performance elect carve propeller first select straight grained 1 X 2 X 24-in balsa block Drill center hole saw blank shape Carve undercam bered sides sand smooth ensur ing two blades symmetrical carve away back sides prop until blades about 3/32 thick mid-point Finally shape blades finished outline hinge plate shown plan made 1/32 brass sheet short continued page 99 May1977 47 SOVY 3B SHEET7 \LIMx S/B TRAIUNG EDGE NOTO4 I/16X VB SPRUCE DY HOOKS w 0 w w Cd I/IV SHEET PILLERJ / I/IBALUMINUU TUUNG \ I/V DOWEL propellBr Shown pictures Sig 24-in pre-built folder blades trimmed outlines Shown plan wish hack own plans show 24 24-in pitch have run across An added advantage method adds very little drag next column will bring up topic moveable leadouts Richard L Perry 5016 Angelita Ave. Dayton OH 45424 FF Duration/Meuser continued page 44 Models Peck Heck Peck-Poly mers long famous its free flight scale sport kits plans hardware now heavily CO-2 power Peck stocks Brown single twin new Telco Shark motors Nite 16 kit built-up 16-span sport model now includes instructions converting CO-2 power can converted back rubber power minute two great interest CO-2 enthusiasts tanks offered Peck five sizes rang ing teeny l/4 cc 20 cc capacity too Peck offers goodie adapts Ansul fire-extinguisher cartridges three brands CO-2 motors provides flights fraction cost using small cartridges usually used Send Pecks complete catalog P0 Box 2498 La Mesa CA 92041 HLG Dethermalizer Four types have used varying degrees success dropping nose weight pop-up elevator spin-tab Geraghty system latter consists no DT lots gliders pop-up elevator type perfect ed Bill Blanchard seems increas ing popularity new twist old spin-tab device submitted Mark Drela fliers have abandoned spintab DT since tends produce screaming spiral dives defeats original pur pose bring glider down safely version spin-tab system destruc tion model avoided placing tab outside glide circle instead glide circle tightening suicidal spiral dive glide circle either opens up reverses glide path angle steepens about 30-degree angle horizontal nearly straight flight path moderately rapid descent model simply punches through strongest thermals hitching ride next county Other types DT-s have known ineffective strong thermals tab cut 010 brass 015 aluminum sheet 2 2 long glide angle sensitive width bottom flange can trimmed achieve desired angle descent some cases completely removed Turn ing effect can adjusted trimming Aol 1ffSolal 61DMFilm HOT FUEL PROOF DOPEEXCLUSIVE LOW-HEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel pruuf tweight 51flC17 Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 length tab altering opening angle Sounds like its worth try HLG DT systems use fuses course common cause malfunction caused rub ber band pressing too tightly against fuse what worse pressing fuse against heat-robbing piece metal force rubberband should supported something other fuse such way presses lightly against fuse Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about MA Big Boy/Langenberg continued page 47 length 1/32-in ID brass tubing rolled epoxied end 1/32 hinge wire connects blades hub Complete propeller assembly carving noseblock hard balsa ball bearings shaft thrust bearing spring shown drawing can obtained FAT Model Supply Box 9778 Phoenix AZ 85068 1/8 plywood insert glued rear nose block should fit snugly front fuseMay1977 99 / THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Custom Blended Bill Hager 5214 N Dixie Drive Dayton Ohio 45414 lage propeller nose block should given least three coats dope before assembling Ensure propeller blades properly balanced track properly Finished weight propeller assembly should exceed 24 grams Flight Preparation Make up least two /4 rubber motors 16 strands After washing drying lubing motors break initially using stationary stretch method hammer two large nails securely fence about six motor lengths apart motor stretched over nails left live minutes stretched motors should about 42 long Now assemble completed model insert rubber motor Check align ment wing wash-in incidence thrust correct Also verify CG loca tion prop blades folded Shift posi tion D-T timer necessary ensure CG located precisely shown plan Ready fly weight should equal less 222-gram total itemized plan modeler interested serious un limited rubber competition believe re liable sturdy winder winding stooge musts winding stooge custom de signed own car relatively easy build twin advantages im movable holder winding freedom test fly alone significant Flying Under calm conditions hand glide model add packing under sta bilizer leading trailing edge until GM Fuel Dayton Nationals model floats just slight left turn ship should very docile adjust under power Start about 200 turns model should climb right straighten out before prop folds glide left Use thrust adjust ments rudder tab stab tilt obtain pattern Proceed increments until full turns reached Under full power model should climb steep right corkscrew nose pointed up until just before prop folds Motor run should about minute advantages unlimited rubber class duration potential exceeds flight maximum unless down air encountered Unlike Wakefield therefore believe mandatory wind motor absolute capacity flight normally wind motors Big Boy between 700-750 turns depending feel rubber Maximum capacity contrast about 800 turns Sig FAI Model Supply rubber opin ion equivalent Pirelli Wake field events certainly adequate Big Boy Because its smooth texture also less liable nick break several occasions have used same motor three competitive flights unable build Big Boy down structural weight shown plan climb suffers accordingly suggest increase power 16 18 strands real joys un limited rubber event watch model climb great height may unless thermal assisted under powered Try unlimited rubberyoull like Fancy Pants/Margolin continued page 40 exhibited same smooth characteris tics Just sure ship balanced indicated plans little nose weight desirable can go heavier gauge aluminum landing gear plenty fuelproofing engine com partment usually will put balance ball park Lots fun building flying R ockette/J enki ns continued page 57 intended protect leading edge nicks dents Also gluing balsa leading edge gives chance straighten out warps have straight leading edge work sand shape leading edge before gluing framework gether keep putting stress 1/32 ribs Rockettes leading edge sanded sharper angle other air foils have seen seems give slight turbulator effect keep wing light 1/32 ribs used except three center ribs dihedral ribs 1/16 strength building block up trailing edge 1/32 50 will better follow line undercamber Glue ribs leading trailing edges insert top spars dry turn frame work over glue bottom spar may seem unusual bottom spar lie flat always have trouble getting tissue follow undercamber gives tissue surface ad make wing tip allow spars extend past last rib about /8 sand off angle capping wing tips light sheet 1/32 Sand airfoil shape finished tips before gluing dihedral joints because easier han dle tip itself dihedral joint made sanding ends center Tageriet Engines Similar familiar Jetex engines Japanese engines imported Canadian distributor Type equiva lent Jetex 50 Type B Jetex 150 Prices Type $650 Type B $850 Fuel 10 pellets Type $350 6 pellets Type B $350 Academy Products Ltd 51 Millwick Dr Weston Ont Canada 100 Model Aviation 5% nitro $650 gallon 10% nitro $725 gallon 15% nitro -$800 gallon 54 gallon drum 15% $21954 HARRYS HOBBIES WE SHIP FREE WITH 100 GALLON ORDER ooductreviewproduetreviewproduvtrviewproductreview COX ENGINES COX/SANWA RIC SYSTEMS AIRTRONICS KITS Send Complete Catalog 1525 E Warner Ave Santa Ana CA 92702 HOBBIES
Edition: Model Aviation - 1977/05
Page Numbers: 45, 46, 47, 99, 100
UNLIMITED RUBBER event seems frighten away competitive modelers several theories apprehension may adduced perhaps valid ones center around difficulty carving efficient propeller ob taining adequate good quality rubber Presuming two concerns have de terred readers article building unlimited ship assured problems can surmount ed case propeller pre carved version folding hardware attached available Sig Manufac turing Co Inc Likewise rubber quality performance necessary can procured either Sig FAI Model Supply opinion author unlimited rubber offers unique opportunity original design construction theories class almost totally unfettered rules restricting design power limitation set forth current AMA rules wing area exceed 300 sq projected Any amount rubber power allowed no motor run limits established landing gear re quired result flexibility has allowed performance judgment exceed other free-flight class readers have seen high-perfor mance unlimited rubber model climb incredible height fold its prop settle flat floating glide have missed truly rewarding sights free flight world inducement modelers may neophytes unlimited rubber let assure Big Boy built ad justed according plans can climb higher almost free-flight gas model competition today particularly now VTO engine run differentials have eliminated So seek additional free-flight event desire build model truly superior free-flight duration potential per haps Big Boy may Construction Stabilizer Begin construction inJLJ U Few people know what duration Unlimited rubber job dead airthis climbs higher almost gas job stabilizer can covered doped cured before test flights tempted Use contest grade balsa ribs trailing edge tips keep down weight Assemble parts true flat surface adding 1/16 X 1/8 spruce D-T hooks last operation stabilizer should carefully sanded covered tissue tip plates should added before tissue water sprayed given least three coats thinned dope normally prefer nitrate butyrate dope because appears resistant moisture changes air completed stabilizer should absolutely free warps Finished weight should exceed 8 grams Wing Next construction sequence wing straightforward should present few building problems Select wood wing tips care should kept light pos sible two inboard wing panels ribs should cut 1/32 quarter-grain stock trailing edges preferably carved similar 1/8 sheet balsa During assembly front trailing edge should packed up conform airfoil shown plan Assemble wing panels poly hedral dimensions indicated using liberal amounts glue joints ce ment spars ribs polyhedral breaks until panels blocked up prop er angles Install plywood gusset triangular reinforcements shown Carve wing tips soft 3/8 sheet sand entire completed structure carefully facilitate attractive covering job Cover entire wing good quality tissue As stabilizer apply least three coats nitrate dope right board wing panel should have 1/8 washin helps keep right wing up during initial power burst turbulator string should installed shown See airfoil side view Experience has dem onstrated its effectiveness May1977 45 William H Langenberg authors model displays long fuselage high aspect ratio wings typical Unlimited rubber jobs wing must exceed 300 sq inof area Any amount rubber permissible no motor run limits exist landing gear required spells performance RIBS IOjSMRS I/IeX I/3 BALSA WING BENEDEK B I/32 PLYOO GUSSETj I i LI III / I II II~iI VIB SHEET GUSSET TYP USXI/B LE mRS I/U5 1/IrBA iiLFI71ZiZ2 KIr 41 LL V4 S/6 TRAILSIG EDGE I/StS IM5ORCEMENT BOTTOM NOTEe pxwooo NosE FORMERI I/B RT THRUSTISTABILIZER W4 sr em I/B SHEET 5 ITYP3 N y/\\~//\y/f/ 1/32 PIXWOOO GUSSET CENTER SECTION ITURBULATOR 30 LB TEST DACR0I~NN 13/rxIS/BxI/Ir I/IS NEETBALSACWIAINI1/Ir S _____TIE BOTHFS NOTE BALIRCE POINT AFT OI LEN I/IS WINO PLATFORM I/IrS I/V SPRUCE TIE BOTH SIDES Ot1IMERLHF1 iUS r ir II Ijfr5ITYR9 ~ / v-xv \/\v/\\/\//\s/ F [REAR SIDESIDE multi-spar wing Set wing aside allow cure thoroughly Finished weight should exceed 32 grams Fin fin cut soft 3/32 sheet outline shown plans should carved sanded streamline shape indicated give left turn glide Fuselage Select four bard X /8 balsa strips 48 long longerons 48in length stock available 36 strips can used properly spliced splicing use -l long bevel carefully fitted double glue joints locate splices same dis tance along fuselage length best position splice junction two diagonals act reinforcing mem bers Build two fuselage sides plan en suring diagonals run same directions both sides Add sheet fillers rear rubber peg prudent dope both flat sides 1/16 X 1/8 diagonals before cutting size rubber lube will ab sorbed raw wood longerons should also doped before building fuselage sides joining fuselage sides nor mally tack glue X cross pieces longerons about 12 set up fuselage shape throughout length square section insert X 1/16 diagonals proceeding equally along top bottom tack glued ieces removed diagonals take places prefer simple jig can construct ed facilitate fuselage assembly Add sheet balsa fillers front fuselage glue remainder diagonals place Insert 1 / 16 sheet reinforcing pieces inside rear motor hook section indicated plan Now 46 Model Aviation S V x timer pop-Up stabilizer dethermalizer conveniently located side pylon attention directed ttirbulator thread plansaft leading edge SX S/ LEAVING EDGE I/B 34 fIT GUSSET ITYPI zIIv1_iZLrizfZIZI_Lii_Vizii iZIZiLi7iZIzIzzF1Z AA LLI iIIi[iIiIiIiIIiIiIIi ZIZELII vvI II_I LL KU IZIZ[ILIIILIIIZIZII 111_I_IILIIIIILJZ LULLI1 114 I 111L L III I 1 ttI~~A Nv1132 RIBS 10C SHEET GUSSET ITYP TP PLATE V16 SHEET DRAiNPDING PROP HINGE S PLATE VERT WRAP WrTH GLASS TAPE S EPOXY BE WASHER HARD BALSA NOSE BLOCS /B PLYWOOD ______ THRUST BEAR NO 6 0 PLASTIC TUBINGI 114 r__ lB MUS C WIREPROP P0105 HORIZONTALlY /16 W RE PROP STUP HODIC & HARDWARE PA MDGEL SUPPLY P0 BOX STYB PHOENIX ARIZ 05058 ml 301 UNLIMITED RUBOER MODEL DEBONED 510 DRABS BY WILLIAM R LANGENBERG jTRACED 312 INKED BY CLIFFORG FOR JR rYOP SIOE/BOTTOM SIDE I/BX I/V LONGERONS ffI/MX I/B CROSS BRACES I/4ALIM YIJmNOX I RUOCERI/IVX I/V SPRUCED HOOKS IS ,w masw. TIP PLATE I/IV SHEET GRAIN VERY —I /\\ //\\ //\\\\\g\\iji \ If\ /-L4VTUUING \v/ \VI \v/\Ii/ky1\\// \\I/ HEET DI2342S //\$k\\\\~~ f //\\ /f\\ //\\ //\\ 4 4k ~\\ flJH I// k/\\//\\/\\/\\/I\\//\\//IIIIL \\\J\v/V/\//\Y/\\//111111Il FI/1B SHEETY7 ELABE IWITH TIMER4BTOP SECTION UNCOAERED IWINO55 IPROPELLER B NOSE BLOOC54hr SHEET GRANd VERY STABIUZERB RIflER110I/16 ALUMINUM TUENG II/V PLYWObO INSERT IIIVALUMINUM TUBINGL44 ALUMINUM TUENO AI/VX I/V LONGERWIS [v32][b-1-10-1-10]] carve sand /8 right thrust fuselage nose Cut out 1/16 ply wood nose former glue accurately place Sand entire fuselage smooth cover tissue grain perpendicular longerons durability may wish double cover fuselage bottom cross graining tissue finish fuselage cut out wing mounts plus stab wing platforms Glue fuselage shown add 1 / 16-in aluminum tubing D-T line guides 1 / 16 dowel rubber hook Finish assembly gluing rudder fuselage ensuring prop erly aligned elect use D-T w -J -J Ci z -J 0 w N -J -J LA timer should positioned shown Finished weight completed fuselage assembly should exceed 48 grams cluding D-T timer Propdler Two alternative propeller semblies shown model photographs uses Sig 24-in pre-built folding propeller blades trimmed outline shown An alternative propeller experienced energetic modelers de sire carve own also detailed theplan isa24 X 24 version should have about 1/16 undercamber blades have used both type props Big Boy no significant changes performance elect carve propeller first select straight grained 1 X 2 X 24-in balsa block Drill center hole saw blank shape Carve undercam bered sides sand smooth ensur ing two blades symmetrical carve away back sides prop until blades about 3/32 thick mid-point Finally shape blades finished outline hinge plate shown plan made 1/32 brass sheet short continued page 99 May1977 47 SOVY 3B SHEET7 \LIMx S/B TRAIUNG EDGE NOTO4 I/16X VB SPRUCE DY HOOKS w 0 w w Cd I/IV SHEET PILLERJ / I/IBALUMINUU TUUNG \ I/V DOWEL propellBr Shown pictures Sig 24-in pre-built folder blades trimmed outlines Shown plan wish hack own plans show 24 24-in pitch have run across An added advantage method adds very little drag next column will bring up topic moveable leadouts Richard L Perry 5016 Angelita Ave. Dayton OH 45424 FF Duration/Meuser continued page 44 Models Peck Heck Peck-Poly mers long famous its free flight scale sport kits plans hardware now heavily CO-2 power Peck stocks Brown single twin new Telco Shark motors Nite 16 kit built-up 16-span sport model now includes instructions converting CO-2 power can converted back rubber power minute two great interest CO-2 enthusiasts tanks offered Peck five sizes rang ing teeny l/4 cc 20 cc capacity too Peck offers goodie adapts Ansul fire-extinguisher cartridges three brands CO-2 motors provides flights fraction cost using small cartridges usually used Send Pecks complete catalog P0 Box 2498 La Mesa CA 92041 HLG Dethermalizer Four types have used varying degrees success dropping nose weight pop-up elevator spin-tab Geraghty system latter consists no DT lots gliders pop-up elevator type perfect ed Bill Blanchard seems increas ing popularity new twist old spin-tab device submitted Mark Drela fliers have abandoned spintab DT since tends produce screaming spiral dives defeats original pur pose bring glider down safely version spin-tab system destruc tion model avoided placing tab outside glide circle instead glide circle tightening suicidal spiral dive glide circle either opens up reverses glide path angle steepens about 30-degree angle horizontal nearly straight flight path moderately rapid descent model simply punches through strongest thermals hitching ride next county Other types DT-s have known ineffective strong thermals tab cut 010 brass 015 aluminum sheet 2 2 long glide angle sensitive width bottom flange can trimmed achieve desired angle descent some cases completely removed Turn ing effect can adjusted trimming Aol 1ffSolal 61DMFilm HOT FUEL PROOF DOPEEXCLUSIVE LOW-HEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel pruuf tweight 51flC17 Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 length tab altering opening angle Sounds like its worth try HLG DT systems use fuses course common cause malfunction caused rub ber band pressing too tightly against fuse what worse pressing fuse against heat-robbing piece metal force rubberband should supported something other fuse such way presses lightly against fuse Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about MA Big Boy/Langenberg continued page 47 length 1/32-in ID brass tubing rolled epoxied end 1/32 hinge wire connects blades hub Complete propeller assembly carving noseblock hard balsa ball bearings shaft thrust bearing spring shown drawing can obtained FAT Model Supply Box 9778 Phoenix AZ 85068 1/8 plywood insert glued rear nose block should fit snugly front fuseMay1977 99 / THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Custom Blended Bill Hager 5214 N Dixie Drive Dayton Ohio 45414 lage propeller nose block should given least three coats dope before assembling Ensure propeller blades properly balanced track properly Finished weight propeller assembly should exceed 24 grams Flight Preparation Make up least two /4 rubber motors 16 strands After washing drying lubing motors break initially using stationary stretch method hammer two large nails securely fence about six motor lengths apart motor stretched over nails left live minutes stretched motors should about 42 long Now assemble completed model insert rubber motor Check align ment wing wash-in incidence thrust correct Also verify CG loca tion prop blades folded Shift posi tion D-T timer necessary ensure CG located precisely shown plan Ready fly weight should equal less 222-gram total itemized plan modeler interested serious un limited rubber competition believe re liable sturdy winder winding stooge musts winding stooge custom de signed own car relatively easy build twin advantages im movable holder winding freedom test fly alone significant Flying Under calm conditions hand glide model add packing under sta bilizer leading trailing edge until GM Fuel Dayton Nationals model floats just slight left turn ship should very docile adjust under power Start about 200 turns model should climb right straighten out before prop folds glide left Use thrust adjust ments rudder tab stab tilt obtain pattern Proceed increments until full turns reached Under full power model should climb steep right corkscrew nose pointed up until just before prop folds Motor run should about minute advantages unlimited rubber class duration potential exceeds flight maximum unless down air encountered Unlike Wakefield therefore believe mandatory wind motor absolute capacity flight normally wind motors Big Boy between 700-750 turns depending feel rubber Maximum capacity contrast about 800 turns Sig FAI Model Supply rubber opin ion equivalent Pirelli Wake field events certainly adequate Big Boy Because its smooth texture also less liable nick break several occasions have used same motor three competitive flights unable build Big Boy down structural weight shown plan climb suffers accordingly suggest increase power 16 18 strands real joys un limited rubber event watch model climb great height may unless thermal assisted under powered Try unlimited rubberyoull like Fancy Pants/Margolin continued page 40 exhibited same smooth characteris tics Just sure ship balanced indicated plans little nose weight desirable can go heavier gauge aluminum landing gear plenty fuelproofing engine com partment usually will put balance ball park Lots fun building flying R ockette/J enki ns continued page 57 intended protect leading edge nicks dents Also gluing balsa leading edge gives chance straighten out warps have straight leading edge work sand shape leading edge before gluing framework gether keep putting stress 1/32 ribs Rockettes leading edge sanded sharper angle other air foils have seen seems give slight turbulator effect keep wing light 1/32 ribs used except three center ribs dihedral ribs 1/16 strength building block up trailing edge 1/32 50 will better follow line undercamber Glue ribs leading trailing edges insert top spars dry turn frame work over glue bottom spar may seem unusual bottom spar lie flat always have trouble getting tissue follow undercamber gives tissue surface ad make wing tip allow spars extend past last rib about /8 sand off angle capping wing tips light sheet 1/32 Sand airfoil shape finished tips before gluing dihedral joints because easier han dle tip itself dihedral joint made sanding ends center Tageriet Engines Similar familiar Jetex engines Japanese engines imported Canadian distributor Type equiva lent Jetex 50 Type B Jetex 150 Prices Type $650 Type B $850 Fuel 10 pellets Type $350 6 pellets Type B $350 Academy Products Ltd 51 Millwick Dr Weston Ont Canada 100 Model Aviation 5% nitro $650 gallon 10% nitro $725 gallon 15% nitro -$800 gallon 54 gallon drum 15% $21954 HARRYS HOBBIES WE SHIP FREE WITH 100 GALLON ORDER ooductreviewproduetreviewproduvtrviewproductreview COX ENGINES COX/SANWA RIC SYSTEMS AIRTRONICS KITS Send Complete Catalog 1525 E Warner Ave Santa Ana CA 92702 HOBBIES
Edition: Model Aviation - 1977/05
Page Numbers: 45, 46, 47, 99, 100
UNLIMITED RUBBER event seems frighten away competitive modelers several theories apprehension may adduced perhaps valid ones center around difficulty carving efficient propeller ob taining adequate good quality rubber Presuming two concerns have de terred readers article building unlimited ship assured problems can surmount ed case propeller pre carved version folding hardware attached available Sig Manufac turing Co Inc Likewise rubber quality performance necessary can procured either Sig FAI Model Supply opinion author unlimited rubber offers unique opportunity original design construction theories class almost totally unfettered rules restricting design power limitation set forth current AMA rules wing area exceed 300 sq projected Any amount rubber power allowed no motor run limits established landing gear re quired result flexibility has allowed performance judgment exceed other free-flight class readers have seen high-perfor mance unlimited rubber model climb incredible height fold its prop settle flat floating glide have missed truly rewarding sights free flight world inducement modelers may neophytes unlimited rubber let assure Big Boy built ad justed according plans can climb higher almost free-flight gas model competition today particularly now VTO engine run differentials have eliminated So seek additional free-flight event desire build model truly superior free-flight duration potential per haps Big Boy may Construction Stabilizer Begin construction inJLJ U Few people know what duration Unlimited rubber job dead airthis climbs higher almost gas job stabilizer can covered doped cured before test flights tempted Use contest grade balsa ribs trailing edge tips keep down weight Assemble parts true flat surface adding 1/16 X 1/8 spruce D-T hooks last operation stabilizer should carefully sanded covered tissue tip plates should added before tissue water sprayed given least three coats thinned dope normally prefer nitrate butyrate dope because appears resistant moisture changes air completed stabilizer should absolutely free warps Finished weight should exceed 8 grams Wing Next construction sequence wing straightforward should present few building problems Select wood wing tips care should kept light pos sible two inboard wing panels ribs should cut 1/32 quarter-grain stock trailing edges preferably carved similar 1/8 sheet balsa During assembly front trailing edge should packed up conform airfoil shown plan Assemble wing panels poly hedral dimensions indicated using liberal amounts glue joints ce ment spars ribs polyhedral breaks until panels blocked up prop er angles Install plywood gusset triangular reinforcements shown Carve wing tips soft 3/8 sheet sand entire completed structure carefully facilitate attractive covering job Cover entire wing good quality tissue As stabilizer apply least three coats nitrate dope right board wing panel should have 1/8 washin helps keep right wing up during initial power burst turbulator string should installed shown See airfoil side view Experience has dem onstrated its effectiveness May1977 45 William H Langenberg authors model displays long fuselage high aspect ratio wings typical Unlimited rubber jobs wing must exceed 300 sq inof area Any amount rubber permissible no motor run limits exist landing gear required spells performance RIBS IOjSMRS I/IeX I/3 BALSA WING BENEDEK B I/32 PLYOO GUSSETj I i LI III / I II II~iI VIB SHEET GUSSET TYP USXI/B LE mRS I/U5 1/IrBA iiLFI71ZiZ2 KIr 41 LL V4 S/6 TRAILSIG EDGE I/StS IM5ORCEMENT BOTTOM NOTEe pxwooo NosE FORMERI I/B RT THRUSTISTABILIZER W4 sr em I/B SHEET 5 ITYP3 N y/\\~//\y/f/ 1/32 PIXWOOO GUSSET CENTER SECTION ITURBULATOR 30 LB TEST DACR0I~NN 13/rxIS/BxI/Ir I/IS NEETBALSACWIAINI1/Ir S _____TIE BOTHFS NOTE BALIRCE POINT AFT OI LEN I/IS WINO PLATFORM I/IrS I/V SPRUCE TIE BOTH SIDES Ot1IMERLHF1 iUS r ir II Ijfr5ITYR9 ~ / v-xv \/\v/\\/\//\s/ F [REAR SIDESIDE multi-spar wing Set wing aside allow cure thoroughly Finished weight should exceed 32 grams Fin fin cut soft 3/32 sheet outline shown plans should carved sanded streamline shape indicated give left turn glide Fuselage Select four bard X /8 balsa strips 48 long longerons 48in length stock available 36 strips can used properly spliced splicing use -l long bevel carefully fitted double glue joints locate splices same dis tance along fuselage length best position splice junction two diagonals act reinforcing mem bers Build two fuselage sides plan en suring diagonals run same directions both sides Add sheet fillers rear rubber peg prudent dope both flat sides 1/16 X 1/8 diagonals before cutting size rubber lube will ab sorbed raw wood longerons should also doped before building fuselage sides joining fuselage sides nor mally tack glue X cross pieces longerons about 12 set up fuselage shape throughout length square section insert X 1/16 diagonals proceeding equally along top bottom tack glued ieces removed diagonals take places prefer simple jig can construct ed facilitate fuselage assembly Add sheet balsa fillers front fuselage glue remainder diagonals place Insert 1 / 16 sheet reinforcing pieces inside rear motor hook section indicated plan Now 46 Model Aviation S V x timer pop-Up stabilizer dethermalizer conveniently located side pylon attention directed ttirbulator thread plansaft leading edge SX S/ LEAVING EDGE I/B 34 fIT GUSSET ITYPI zIIv1_iZLrizfZIZI_Lii_Vizii iZIZiLi7iZIzIzzF1Z AA LLI iIIi[iIiIiIiIIiIiIIi ZIZELII vvI II_I LL KU IZIZ[ILIIILIIIZIZII 111_I_IILIIIIILJZ LULLI1 114 I 111L L III I 1 ttI~~A Nv1132 RIBS 10C SHEET GUSSET ITYP TP PLATE V16 SHEET DRAiNPDING PROP HINGE S PLATE VERT WRAP WrTH GLASS TAPE S EPOXY BE WASHER HARD BALSA NOSE BLOCS /B PLYWOOD ______ THRUST BEAR NO 6 0 PLASTIC TUBINGI 114 r__ lB MUS C WIREPROP P0105 HORIZONTALlY /16 W RE PROP STUP HODIC & HARDWARE PA MDGEL SUPPLY P0 BOX STYB PHOENIX ARIZ 05058 ml 301 UNLIMITED RUBOER MODEL DEBONED 510 DRABS BY WILLIAM R LANGENBERG jTRACED 312 INKED BY CLIFFORG FOR JR rYOP SIOE/BOTTOM SIDE I/BX I/V LONGERONS ffI/MX I/B CROSS BRACES I/4ALIM YIJmNOX I RUOCERI/IVX I/V SPRUCED HOOKS IS ,w masw. TIP PLATE I/IV SHEET GRAIN VERY —I /\\ //\\ //\\\\\g\\iji \ If\ /-L4VTUUING \v/ \VI \v/\Ii/ky1\\// \\I/ HEET DI2342S //\$k\\\\~~ f //\\ /f\\ //\\ //\\ 4 4k ~\\ flJH I// k/\\//\\/\\/\\/I\\//\\//IIIIL \\\J\v/V/\//\Y/\\//111111Il FI/1B SHEETY7 ELABE IWITH TIMER4BTOP SECTION UNCOAERED IWINO55 IPROPELLER B NOSE BLOOC54hr SHEET GRANd VERY STABIUZERB RIflER110I/16 ALUMINUM TUENG II/V PLYWObO INSERT IIIVALUMINUM TUBINGL44 ALUMINUM TUENO AI/VX I/V LONGERWIS [v32][b-1-10-1-10]] carve sand /8 right thrust fuselage nose Cut out 1/16 ply wood nose former glue accurately place Sand entire fuselage smooth cover tissue grain perpendicular longerons durability may wish double cover fuselage bottom cross graining tissue finish fuselage cut out wing mounts plus stab wing platforms Glue fuselage shown add 1 / 16-in aluminum tubing D-T line guides 1 / 16 dowel rubber hook Finish assembly gluing rudder fuselage ensuring prop erly aligned elect use D-T w -J -J Ci z -J 0 w N -J -J LA timer should positioned shown Finished weight completed fuselage assembly should exceed 48 grams cluding D-T timer Propdler Two alternative propeller semblies shown model photographs uses Sig 24-in pre-built folding propeller blades trimmed outline shown An alternative propeller experienced energetic modelers de sire carve own also detailed theplan isa24 X 24 version should have about 1/16 undercamber blades have used both type props Big Boy no significant changes performance elect carve propeller first select straight grained 1 X 2 X 24-in balsa block Drill center hole saw blank shape Carve undercam bered sides sand smooth ensur ing two blades symmetrical carve away back sides prop until blades about 3/32 thick mid-point Finally shape blades finished outline hinge plate shown plan made 1/32 brass sheet short continued page 99 May1977 47 SOVY 3B SHEET7 \LIMx S/B TRAIUNG EDGE NOTO4 I/16X VB SPRUCE DY HOOKS w 0 w w Cd I/IV SHEET PILLERJ / I/IBALUMINUU TUUNG \ I/V DOWEL propellBr Shown pictures Sig 24-in pre-built folder blades trimmed outlines Shown plan wish hack own plans show 24 24-in pitch have run across An added advantage method adds very little drag next column will bring up topic moveable leadouts Richard L Perry 5016 Angelita Ave. Dayton OH 45424 FF Duration/Meuser continued page 44 Models Peck Heck Peck-Poly mers long famous its free flight scale sport kits plans hardware now heavily CO-2 power Peck stocks Brown single twin new Telco Shark motors Nite 16 kit built-up 16-span sport model now includes instructions converting CO-2 power can converted back rubber power minute two great interest CO-2 enthusiasts tanks offered Peck five sizes rang ing teeny l/4 cc 20 cc capacity too Peck offers goodie adapts Ansul fire-extinguisher cartridges three brands CO-2 motors provides flights fraction cost using small cartridges usually used Send Pecks complete catalog P0 Box 2498 La Mesa CA 92041 HLG Dethermalizer Four types have used varying degrees success dropping nose weight pop-up elevator spin-tab Geraghty system latter consists no DT lots gliders pop-up elevator type perfect ed Bill Blanchard seems increas ing popularity new twist old spin-tab device submitted Mark Drela fliers have abandoned spintab DT since tends produce screaming spiral dives defeats original pur pose bring glider down safely version spin-tab system destruc tion model avoided placing tab outside glide circle instead glide circle tightening suicidal spiral dive glide circle either opens up reverses glide path angle steepens about 30-degree angle horizontal nearly straight flight path moderately rapid descent model simply punches through strongest thermals hitching ride next county Other types DT-s have known ineffective strong thermals tab cut 010 brass 015 aluminum sheet 2 2 long glide angle sensitive width bottom flange can trimmed achieve desired angle descent some cases completely removed Turn ing effect can adjusted trimming Aol 1ffSolal 61DMFilm HOT FUEL PROOF DOPEEXCLUSIVE LOW-HEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel pruuf tweight 51flC17 Industries Inc 7080 HOLLYWOOD BLVD LOS ANGELES CA 90028 length tab altering opening angle Sounds like its worth try HLG DT systems use fuses course common cause malfunction caused rub ber band pressing too tightly against fuse what worse pressing fuse against heat-robbing piece metal force rubberband should supported something other fuse such way presses lightly against fuse Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about MA Big Boy/Langenberg continued page 47 length 1/32-in ID brass tubing rolled epoxied end 1/32 hinge wire connects blades hub Complete propeller assembly carving noseblock hard balsa ball bearings shaft thrust bearing spring shown drawing can obtained FAT Model Supply Box 9778 Phoenix AZ 85068 1/8 plywood insert glued rear nose block should fit snugly front fuseMay1977 99 / THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Custom Blended Bill Hager 5214 N Dixie Drive Dayton Ohio 45414 lage propeller nose block should given least three coats dope before assembling Ensure propeller blades properly balanced track properly Finished weight propeller assembly should exceed 24 grams Flight Preparation Make up least two /4 rubber motors 16 strands After washing drying lubing motors break initially using stationary stretch method hammer two large nails securely fence about six motor lengths apart motor stretched over nails left live minutes stretched motors should about 42 long Now assemble completed model insert rubber motor Check align ment wing wash-in incidence thrust correct Also verify CG loca tion prop blades folded Shift posi tion D-T timer necessary ensure CG located precisely shown plan Ready fly weight should equal less 222-gram total itemized plan modeler interested serious un limited rubber competition believe re liable sturdy winder winding stooge musts winding stooge custom de signed own car relatively easy build twin advantages im movable holder winding freedom test fly alone significant Flying Under calm conditions hand glide model add packing under sta bilizer leading trailing edge until GM Fuel Dayton Nationals model floats just slight left turn ship should very docile adjust under power Start about 200 turns model should climb right straighten out before prop folds glide left Use thrust adjust ments rudder tab stab tilt obtain pattern Proceed increments until full turns reached Under full power model should climb steep right corkscrew nose pointed up until just before prop folds Motor run should about minute advantages unlimited rubber class duration potential exceeds flight maximum unless down air encountered Unlike Wakefield therefore believe mandatory wind motor absolute capacity flight normally wind motors Big Boy between 700-750 turns depending feel rubber Maximum capacity contrast about 800 turns Sig FAI Model Supply rubber opin ion equivalent Pirelli Wake field events certainly adequate Big Boy Because its smooth texture also less liable nick break several occasions have used same motor three competitive flights unable build Big Boy down structural weight shown plan climb suffers accordingly suggest increase power 16 18 strands real joys un limited rubber event watch model climb great height may unless thermal assisted under powered Try unlimited rubberyoull like Fancy Pants/Margolin continued page 40 exhibited same smooth characteris tics Just sure ship balanced indicated plans little nose weight desirable can go heavier gauge aluminum landing gear plenty fuelproofing engine com partment usually will put balance ball park Lots fun building flying R ockette/J enki ns continued page 57 intended protect leading edge nicks dents Also gluing balsa leading edge gives chance straighten out warps have straight leading edge work sand shape leading edge before gluing framework gether keep putting stress 1/32 ribs Rockettes leading edge sanded sharper angle other air foils have seen seems give slight turbulator effect keep wing light 1/32 ribs used except three center ribs dihedral ribs 1/16 strength building block up trailing edge 1/32 50 will better follow line undercamber Glue ribs leading trailing edges insert top spars dry turn frame work over glue bottom spar may seem unusual bottom spar lie flat always have trouble getting tissue follow undercamber gives tissue surface ad make wing tip allow spars extend past last rib about /8 sand off angle capping wing tips light sheet 1/32 Sand airfoil shape finished tips before gluing dihedral joints because easier han dle tip itself dihedral joint made sanding ends center Tageriet Engines Similar familiar Jetex engines Japanese engines imported Canadian distributor Type equiva lent Jetex 50 Type B Jetex 150 Prices Type $650 Type B $850 Fuel 10 pellets Type $350 6 pellets Type B $350 Academy Products Ltd 51 Millwick Dr Weston Ont Canada 100 Model Aviation 5% nitro $650 gallon 10% nitro $725 gallon 15% nitro -$800 gallon 54 gallon drum 15% $21954 HARRYS HOBBIES WE SHIP FREE WITH 100 GALLON ORDER ooductreviewproduetreviewproduvtrviewproductreview COX ENGINES COX/SANWA RIC SYSTEMS AIRTRONICS KITS Send Complete Catalog 1525 E Warner Ave Santa Ana CA 92702 HOBBIES