Control Line Speed Gene Hempel THE FUN back high-tech Speed article few selected old pros beginner would like build fly Jet model thats simple build easy run begin lets get rid some myths about Jets 1 Jets dangerous Wrong Jets noisy scare people first really safer screaming piston engine few precautions Avoid coming contact high-tension lead ignition coil good treatment hangover useful starting heart following cardiac arrest cant think other useful reason doing end flight dont pick up model engine Unless extreme ly slow learner will once 4eep valuable sensitive body parts away force jet blast 2 Jets hard start require expensive sophisticated equipment critical adjust Wrong fuel mixtures suggest ed later column jet engine will con sistently start two three strokes good tire pump run smoothly throughout flight Jet engines very cantankerous gasoline fable came highly-modified competition engines pain backside start fancy compressed air system 3 Cant get parts engines readily available Initial cost little high exception reed valve everything else can last lifetime Mail stamped selfaddressed envelope P&G Metal Products information address later Model construction fuel tank made brass shim stock 007- 010 thickness Cut out block wood x 1 x 10 sand surfaces smooth Using wood block pattern mark brass what will B B n 0 0 0 18-IN 00 TUBING 18-IN WIRE SKID FUEL TANK 1 1 10-IN J 007 BRASS SHIM STOCK WING DR-IN BASSWOOD YI K [II BALSA FILLER 3132-IN DO TUBING BELLCRANK AND LINE GUIDE MOUNTED BELOW PHIRE PHART DYNAJET SPORT SPEED LENGTH 24 IN SPAN 20 IN DESIGNED BY CHARLIE DAVIS COPYRIGHT 1906 Os GENE HEMPE x 1 B-IN DJRAMINUM MOUNT FRONT AND BEAR K 2 N BASSISOOD TB TC lOIN PBWGDDSTAB MONB NT STRAP 020 SCAINLESS STECL MADE EROS I-aSK CLAMP II II\I BALSA F LXR EEk ATISA WIT, DACRON IS NYLON CORD 3 32-IN WIRE SKO Zj N PRESSURE FITTING 1 IN GD S TIBING WRAP W 1- COPPER W BE AND SI EIl 0255 Gene notes plane will never set anyAMA Jet Speed recordsbut its heck lot fun fly perfectJettrainerand introduction toCLSpeed flying Asharp eyewill note photo isa shadow atopthefuselage portions thewing stab layer insulationthe jet pipe gets red hot inside surface sharp instrument along corners block Now bend along marks 900 metal brake clamping between two pieces metal wood strips tank can done piece find easier make three pieces part consisting four sides overlapping tab separate pieces front rear tank Clamp bent metal around wood block solder along overlapping joint Cut one-inch square piece brass push wood block back fraction front end insert square brass just inside front end tank solder place Remove wood block best done inserting wood screw its opposite end pulling out pliers Drill A-in hole fuel pickup tube 3A2-in vent Solder place shown drawing fuel pickup 70 Model Aviation Modifying stock Dynajet head accept mounting strap last three fins turned down diameter 020 less fin just front Three things 1 1/s-in brass tube sol dered flowiector quick-disconnect starting pump 2 Sparkplug retaining nut turned down halt its original thick- Pressure fitting arrow silver-soldered ness eliminate hot spot com- jet pipe used pressurize fuel bustion chamber 3 11/z-in tube being tankBesureitsmountedabovethecenter used helpputsome camberintothe reed- line engine Author Hempel has lots valve petals ensure good seal information column Control Line Handle STAINLESS STEEL CABLE 175 LB TEST S Hi-Tech Design ComfortableCompact Engineered Long Life S WItI- RENGTH KMultiple Line Spacing ALLOY Sensitivity Control 4For Manufactured Sagan Industries Inc 3614 35th St LIC NY 11106 tube should extend five inches back fuel tank Cut another square brass back end will fit just inside Hold place strip masking tape tack-solder corners Remove tape finish solder ing Small tabs soldered outboard side secure tank fuselage crutch wood screws Wing construction 3A-in basswood Its very important make symmetrical lift ing airfoil Jet disaster extremely un stable familiar solid wing construction method Cut Out wing blank lay flat surface draw line along leading trailing edges half way through thickness Calculate 40% wing chord leading edge mark point wing tip root wing Example Wing chord x 040 XXX Join two points solid line both top bottom wing blank Using lines reference points air foil can carved wood rasp razor plane However prefer use one-inch belt sander rough finish complete sandpaper hand Note prefer leave bottom center section uncarved method makes easier attach wing fuselage requiring notch crutch rather having cut contour match es airfoil fuselage crutch A-in basswood Cut out front rear engine supports -in duraluminum thats hard aluminum soft stuff cut notches inboard side fuselage crutch tbey will flush surface mounting rings made large hose clamps 025-in stainless steel simple method laying out ring wrap masking tape around engine mount will fit Cut out A-in section tape remove engine place metal strip gives exact cir cumference Bend tabs metal beyond ends tape mounting strap just made very springy will hard close mounting engine solve problem put machine screw through holes tabs strap held circular shape heat torch over gas burner kitchen stove will tend retain its shape strength after cools stabilizer A-in plywood hinged using dacron nylon cord laced figureeight motion Mount choice control horn time Dont use plastic may melt soften engine heat find proper location wing mount engine temporarily attach tank tail find CO model prefer balance leading edge wing model should slightly nose-heavy point Cut notches top fuselage crutch wing tail wing tail glued crutch Titebond some other aliphatic white glue secured wood screws also works well mounting skid tank skids both wings inlaid wood held place epoxy Note very critical must installed model pussycat skid off dolly Without youre excitement flood Alka Seltzer factory control system external mounted under wing Inlay piece /-in alumi num extra strength although probably isnt necessary speeds stock engine will turn bellcrank control horn avail able local hobby shop Dont waste time fancy paint job because fuel mixture will take warts off frog Two coats clear polyurethane sufficient few items check jet engine make life less frustrating Check holes flowjector best results holes should size No 57 drill bit too small drill out too large solder up redrill next item spark plug plug held place large nut inside combus tion chamber creates hot spot will contribute burning petals reed valve adjacent spark plug Either face nut off lathe grind down thickness just enough hold plug about Az /-in thick flowjector comes threaded area used screw tire pump excite ment noise fury difficult discon nect screwed-on connection quickly An aiter nate method drill small /-in hole insert piece 1-in tubing solder place air supply can attached piece fuel tubing can pulled off quickly engine can mounted strap formed around combustion chamber just front spark plug Another method machine last three fins head 020 less fin front shown photos lathe isnt available head can mounted drill press A-20 bolt thin plywood washer protect face turned down carefully handheld file easy starting reeds must have good seal over ports requires petals slightly bent forwardbut must equal will seal accomplish cut off small section 1 A-in pipe about inch long Place flat surface lay reed centered over piece pipe finger press center reed forc ing down about -in piece pipe several times petals will bent forward equally engine will run well suction pressure system preferable accomplish drill A-in hole combustion chamber about same distance back head spark plug Insert small piece A6-in OD tubing reinforced wrapping copper wire portion outside combustion chamber silver solder place pressure fitting connected tank vent small-size silicone fuel tubing engine little harder start pressure five six pump strokes instead two three system gives much consistent fuel feed adds four five miles per hour Fuel mixture Over last year have found two mixtures easy-starting run consistently have good power first mixture 35% alcohol 35% methylethylketone MEK 15% nitromethane 15% propylene oxide pressure use 039-in metering jet suction 058-in metering jet second fuel mixture recently tried 80% alcohol 20% MEK using 038 metering jet pressure 058-060 suction very little difference performance second mixture considerably cheaper about $350 gailon recommend nitro propylene oxide mixtures used all-out Speed models stock engine Metering jets smaller-sized jets used pressure available P&G Metal ProdContinued page 156 August 1986 71 IDEAL FOR SPORT FLYING AND COMPETITION AT BETTER HOBBY SHOPS AMA WiNG NUMBERS AMA number single decal Ready apply AMA171120L1 Black letters Clear plastic peel & stIck CL Speed/Hem pel Continued page 71 ucts larger-sized jets will have machined Use brass 10-32 machine screw Cut desired length drill out almost entire length No 42 drill bit drill very last portion desired drill size Machine off enough threads fuel tub ing slide Starting procedure Utilizing fuel mixtures listed previously engine very easy start Attach air supply Model T coil ignition Raise nose model about 450 turn coil pump should start two four pumps Launching model simply letting go either straight ahead angled out slightly very important pilot back up keep lines tight first l/ lap Remember thrust push behind rather pull line tension must maintained until speed builds up centrifugal force keeps model mov ing straight fly model 65-ft 018 single-strand solid wire two pieces equipment will need normally modelers tool box piece lA-in steel pipe good hammer jet pipes bend hard land ing can straightened forcing pipe inside jet pipe smoothing out dents hammer Give Jet try might just get hooked first weekend out put over 30 flights SupplIers needed supplies Sears Auto Centerhigh-volume tire pump JC Whitney Model T ignition coil Paint storeMEK stan dard brands chain Jet EngineP&G Metal Products 301 North Yale Dr Garland TX 70542 months column written help Charlie Davis noted Jet modeler Speed flier has motivation behind hav ing fun flying Speed instead stand ing front milling machine lathe months column copyright 1986 Gene Hempel Gene Hempel 301 N Yale Dr Garland TX 75042 Quickie Rat/Williams Continued page 74 through center venturi goes saying rules prohibit troduction air engine through passage other venturi designate minimum length above below spraybar specified bore must maintained also supply 10% fuel event requirements allow us race comfortably 100-mph range provide us simple reliable system promotes success competitors no matter what level Clear Lake Line Winders plan sponsor Quickie Rat unofficial event Lake Charles Nats summer youre going Nats wed like have come race us Construction airplane pretty straightforward just arent whole lot parts deal wont take couple days build wing built epoxying Tite bonding piece -in medium-to-firm balsa onto 2-in plywood wing bottom bottom should continuous piece plywood dont butt two 12-in pieces gether center can substitute 1/16 plywood wing bottom like used build way Ive decided 2 works just well saves some weight Rout out center balsa down plywood through inset the-in plywood belicrank mount/main spar epoxy After has cured sand wing shape bringing trailing edge down plywood skin construction method gives fairly light rigid wing trailing edge firm enough grasped during pitting damage Rout out recess outboard tip bury about 1 oz lead wing tip like wing can covered layer 1 5-oz glass cloth adhered K&B clear Superpoxy fuselage isnt evenings work either engine mounts fuselage Youll need piece 18in maple upper engine mount shorter piece lower Fill between mounts -in balsa add -in ply wood sub-rudder/tail skid piece plywood inboard side engine take power sander Rout recess fuselage/engine mounts landing gear wire lay same time cut engine plate -in aluminum fit engine Bend landing gear wire upper end fits upper engine mount bend will keep rotating aluminum engine plate holds place Ive using tAz music wire forthe landing gear also works fine stab elevator cut -in basswood Ive shown sewn hinges anything will Add Vt-in plywood rudder like Mount wing stab fuselage using liberal amounts epoxy nylon tape check carefully proper alignment like wing go through fuselage rather mounted top upper engine mount its just safer sturdier Add -in plywood lead-out gnide youre just about done woodwork Give whole thing couple coats K&B Superpoxy clear set aside thats left build tank shut off favorite type tip skids like bolt bellcrank Ive re cently taken using silicone sealer attach tank body course standard add some hooks rubberband thing does give easy access repair leaks like since arent running pressure thats just critical planes really quite durable have eight years old use loaner 156 Model Aviation r ROUSH KITS TaylorCraft Full span 108 Area 1670 Clipped 84 Area 1300 Power 75 12 Cu Bales & Pl 2 lbs $11995 Super Sport 120 Span 73 Area 960 Power 75 12 cv $9995 Super Kwik Fli Span 70 Area 927 Power 75 12 Cu $8995 Two Ugly Stick span 70 Area 1290 Power 75 12 Cu $9995 Jr Sticks span 72 Area 1060 Power 75 12 Cu $7995 Direct Sales Only Prices Include Shipping Send $100 Catalog ROUSH MFG 1726 Dywood St SE Canton Ohio 44707 2104644610 RUBBER POWERED FLYING MODELS KITS S SSORIES KITSTISSUE -LUBE-PROPELLERS SHAFTS BEARINGS WHEELS LARGE CATALOG OF QUALITY SUPPLIES KITS AND PLANS FOR RUBBER POWERED MODELS ALSO CO-2 ENGINES BLIMPS ELECTRIC AND MORE FULL C4T4LOC $209 NEW NO 619 448-1818 j Peck-Pelymers - BOX 2498 -MA LA MESA CA 920414 I2 includes postage & 8 TOr
Edition: Model Aviation - 1986/08
Page Numbers: 70, 71, 156
Control Line Speed Gene Hempel THE FUN back high-tech Speed article few selected old pros beginner would like build fly Jet model thats simple build easy run begin lets get rid some myths about Jets 1 Jets dangerous Wrong Jets noisy scare people first really safer screaming piston engine few precautions Avoid coming contact high-tension lead ignition coil good treatment hangover useful starting heart following cardiac arrest cant think other useful reason doing end flight dont pick up model engine Unless extreme ly slow learner will once 4eep valuable sensitive body parts away force jet blast 2 Jets hard start require expensive sophisticated equipment critical adjust Wrong fuel mixtures suggest ed later column jet engine will con sistently start two three strokes good tire pump run smoothly throughout flight Jet engines very cantankerous gasoline fable came highly-modified competition engines pain backside start fancy compressed air system 3 Cant get parts engines readily available Initial cost little high exception reed valve everything else can last lifetime Mail stamped selfaddressed envelope P&G Metal Products information address later Model construction fuel tank made brass shim stock 007- 010 thickness Cut out block wood x 1 x 10 sand surfaces smooth Using wood block pattern mark brass what will B B n 0 0 0 18-IN 00 TUBING 18-IN WIRE SKID FUEL TANK 1 1 10-IN J 007 BRASS SHIM STOCK WING DR-IN BASSWOOD YI K [II BALSA FILLER 3132-IN DO TUBING BELLCRANK AND LINE GUIDE MOUNTED BELOW PHIRE PHART DYNAJET SPORT SPEED LENGTH 24 IN SPAN 20 IN DESIGNED BY CHARLIE DAVIS COPYRIGHT 1906 Os GENE HEMPE x 1 B-IN DJRAMINUM MOUNT FRONT AND BEAR K 2 N BASSISOOD TB TC lOIN PBWGDDSTAB MONB NT STRAP 020 SCAINLESS STECL MADE EROS I-aSK CLAMP II II\I BALSA F LXR EEk ATISA WIT, DACRON IS NYLON CORD 3 32-IN WIRE SKO Zj N PRESSURE FITTING 1 IN GD S TIBING WRAP W 1- COPPER W BE AND SI EIl 0255 Gene notes plane will never set anyAMA Jet Speed recordsbut its heck lot fun fly perfectJettrainerand introduction toCLSpeed flying Asharp eyewill note photo isa shadow atopthefuselage portions thewing stab layer insulationthe jet pipe gets red hot inside surface sharp instrument along corners block Now bend along marks 900 metal brake clamping between two pieces metal wood strips tank can done piece find easier make three pieces part consisting four sides overlapping tab separate pieces front rear tank Clamp bent metal around wood block solder along overlapping joint Cut one-inch square piece brass push wood block back fraction front end insert square brass just inside front end tank solder place Remove wood block best done inserting wood screw its opposite end pulling out pliers Drill A-in hole fuel pickup tube 3A2-in vent Solder place shown drawing fuel pickup 70 Model Aviation Modifying stock Dynajet head accept mounting strap last three fins turned down diameter 020 less fin just front Three things 1 1/s-in brass tube sol dered flowiector quick-disconnect starting pump 2 Sparkplug retaining nut turned down halt its original thick- Pressure fitting arrow silver-soldered ness eliminate hot spot com- jet pipe used pressurize fuel bustion chamber 3 11/z-in tube being tankBesureitsmountedabovethecenter used helpputsome camberintothe reed- line engine Author Hempel has lots valve petals ensure good seal information column Control Line Handle STAINLESS STEEL CABLE 175 LB TEST S Hi-Tech Design ComfortableCompact Engineered Long Life S WItI- RENGTH KMultiple Line Spacing ALLOY Sensitivity Control 4For Manufactured Sagan Industries Inc 3614 35th St LIC NY 11106 tube should extend five inches back fuel tank Cut another square brass back end will fit just inside Hold place strip masking tape tack-solder corners Remove tape finish solder ing Small tabs soldered outboard side secure tank fuselage crutch wood screws Wing construction 3A-in basswood Its very important make symmetrical lift ing airfoil Jet disaster extremely un stable familiar solid wing construction method Cut Out wing blank lay flat surface draw line along leading trailing edges half way through thickness Calculate 40% wing chord leading edge mark point wing tip root wing Example Wing chord x 040 XXX Join two points solid line both top bottom wing blank Using lines reference points air foil can carved wood rasp razor plane However prefer use one-inch belt sander rough finish complete sandpaper hand Note prefer leave bottom center section uncarved method makes easier attach wing fuselage requiring notch crutch rather having cut contour match es airfoil fuselage crutch A-in basswood Cut out front rear engine supports -in duraluminum thats hard aluminum soft stuff cut notches inboard side fuselage crutch tbey will flush surface mounting rings made large hose clamps 025-in stainless steel simple method laying out ring wrap masking tape around engine mount will fit Cut out A-in section tape remove engine place metal strip gives exact cir cumference Bend tabs metal beyond ends tape mounting strap just made very springy will hard close mounting engine solve problem put machine screw through holes tabs strap held circular shape heat torch over gas burner kitchen stove will tend retain its shape strength after cools stabilizer A-in plywood hinged using dacron nylon cord laced figureeight motion Mount choice control horn time Dont use plastic may melt soften engine heat find proper location wing mount engine temporarily attach tank tail find CO model prefer balance leading edge wing model should slightly nose-heavy point Cut notches top fuselage crutch wing tail wing tail glued crutch Titebond some other aliphatic white glue secured wood screws also works well mounting skid tank skids both wings inlaid wood held place epoxy Note very critical must installed model pussycat skid off dolly Without youre excitement flood Alka Seltzer factory control system external mounted under wing Inlay piece /-in alumi num extra strength although probably isnt necessary speeds stock engine will turn bellcrank control horn avail able local hobby shop Dont waste time fancy paint job because fuel mixture will take warts off frog Two coats clear polyurethane sufficient few items check jet engine make life less frustrating Check holes flowjector best results holes should size No 57 drill bit too small drill out too large solder up redrill next item spark plug plug held place large nut inside combus tion chamber creates hot spot will contribute burning petals reed valve adjacent spark plug Either face nut off lathe grind down thickness just enough hold plug about Az /-in thick flowjector comes threaded area used screw tire pump excite ment noise fury difficult discon nect screwed-on connection quickly An aiter nate method drill small /-in hole insert piece 1-in tubing solder place air supply can attached piece fuel tubing can pulled off quickly engine can mounted strap formed around combustion chamber just front spark plug Another method machine last three fins head 020 less fin front shown photos lathe isnt available head can mounted drill press A-20 bolt thin plywood washer protect face turned down carefully handheld file easy starting reeds must have good seal over ports requires petals slightly bent forwardbut must equal will seal accomplish cut off small section 1 A-in pipe about inch long Place flat surface lay reed centered over piece pipe finger press center reed forc ing down about -in piece pipe several times petals will bent forward equally engine will run well suction pressure system preferable accomplish drill A-in hole combustion chamber about same distance back head spark plug Insert small piece A6-in OD tubing reinforced wrapping copper wire portion outside combustion chamber silver solder place pressure fitting connected tank vent small-size silicone fuel tubing engine little harder start pressure five six pump strokes instead two three system gives much consistent fuel feed adds four five miles per hour Fuel mixture Over last year have found two mixtures easy-starting run consistently have good power first mixture 35% alcohol 35% methylethylketone MEK 15% nitromethane 15% propylene oxide pressure use 039-in metering jet suction 058-in metering jet second fuel mixture recently tried 80% alcohol 20% MEK using 038 metering jet pressure 058-060 suction very little difference performance second mixture considerably cheaper about $350 gailon recommend nitro propylene oxide mixtures used all-out Speed models stock engine Metering jets smaller-sized jets used pressure available P&G Metal ProdContinued page 156 August 1986 71 IDEAL FOR SPORT FLYING AND COMPETITION AT BETTER HOBBY SHOPS AMA WiNG NUMBERS AMA number single decal Ready apply AMA171120L1 Black letters Clear plastic peel & stIck CL Speed/Hem pel Continued page 71 ucts larger-sized jets will have machined Use brass 10-32 machine screw Cut desired length drill out almost entire length No 42 drill bit drill very last portion desired drill size Machine off enough threads fuel tub ing slide Starting procedure Utilizing fuel mixtures listed previously engine very easy start Attach air supply Model T coil ignition Raise nose model about 450 turn coil pump should start two four pumps Launching model simply letting go either straight ahead angled out slightly very important pilot back up keep lines tight first l/ lap Remember thrust push behind rather pull line tension must maintained until speed builds up centrifugal force keeps model mov ing straight fly model 65-ft 018 single-strand solid wire two pieces equipment will need normally modelers tool box piece lA-in steel pipe good hammer jet pipes bend hard land ing can straightened forcing pipe inside jet pipe smoothing out dents hammer Give Jet try might just get hooked first weekend out put over 30 flights SupplIers needed supplies Sears Auto Centerhigh-volume tire pump JC Whitney Model T ignition coil Paint storeMEK stan dard brands chain Jet EngineP&G Metal Products 301 North Yale Dr Garland TX 70542 months column written help Charlie Davis noted Jet modeler Speed flier has motivation behind hav ing fun flying Speed instead stand ing front milling machine lathe months column copyright 1986 Gene Hempel Gene Hempel 301 N Yale Dr Garland TX 75042 Quickie Rat/Williams Continued page 74 through center venturi goes saying rules prohibit troduction air engine through passage other venturi designate minimum length above below spraybar specified bore must maintained also supply 10% fuel event requirements allow us race comfortably 100-mph range provide us simple reliable system promotes success competitors no matter what level Clear Lake Line Winders plan sponsor Quickie Rat unofficial event Lake Charles Nats summer youre going Nats wed like have come race us Construction airplane pretty straightforward just arent whole lot parts deal wont take couple days build wing built epoxying Tite bonding piece -in medium-to-firm balsa onto 2-in plywood wing bottom bottom should continuous piece plywood dont butt two 12-in pieces gether center can substitute 1/16 plywood wing bottom like used build way Ive decided 2 works just well saves some weight Rout out center balsa down plywood through inset the-in plywood belicrank mount/main spar epoxy After has cured sand wing shape bringing trailing edge down plywood skin construction method gives fairly light rigid wing trailing edge firm enough grasped during pitting damage Rout out recess outboard tip bury about 1 oz lead wing tip like wing can covered layer 1 5-oz glass cloth adhered K&B clear Superpoxy fuselage isnt evenings work either engine mounts fuselage Youll need piece 18in maple upper engine mount shorter piece lower Fill between mounts -in balsa add -in ply wood sub-rudder/tail skid piece plywood inboard side engine take power sander Rout recess fuselage/engine mounts landing gear wire lay same time cut engine plate -in aluminum fit engine Bend landing gear wire upper end fits upper engine mount bend will keep rotating aluminum engine plate holds place Ive using tAz music wire forthe landing gear also works fine stab elevator cut -in basswood Ive shown sewn hinges anything will Add Vt-in plywood rudder like Mount wing stab fuselage using liberal amounts epoxy nylon tape check carefully proper alignment like wing go through fuselage rather mounted top upper engine mount its just safer sturdier Add -in plywood lead-out gnide youre just about done woodwork Give whole thing couple coats K&B Superpoxy clear set aside thats left build tank shut off favorite type tip skids like bolt bellcrank Ive re cently taken using silicone sealer attach tank body course standard add some hooks rubberband thing does give easy access repair leaks like since arent running pressure thats just critical planes really quite durable have eight years old use loaner 156 Model Aviation r ROUSH KITS TaylorCraft Full span 108 Area 1670 Clipped 84 Area 1300 Power 75 12 Cu Bales & Pl 2 lbs $11995 Super Sport 120 Span 73 Area 960 Power 75 12 cv $9995 Super Kwik Fli Span 70 Area 927 Power 75 12 Cu $8995 Two Ugly Stick span 70 Area 1290 Power 75 12 Cu $9995 Jr Sticks span 72 Area 1060 Power 75 12 Cu $7995 Direct Sales Only Prices Include Shipping Send $100 Catalog ROUSH MFG 1726 Dywood St SE Canton Ohio 44707 2104644610 RUBBER POWERED FLYING MODELS KITS S SSORIES KITSTISSUE -LUBE-PROPELLERS SHAFTS BEARINGS WHEELS LARGE CATALOG OF QUALITY SUPPLIES KITS AND PLANS FOR RUBBER POWERED MODELS ALSO CO-2 ENGINES BLIMPS ELECTRIC AND MORE FULL C4T4LOC $209 NEW NO 619 448-1818 j Peck-Pelymers - BOX 2498 -MA LA MESA CA 920414 I2 includes postage & 8 TOr
Edition: Model Aviation - 1986/08
Page Numbers: 70, 71, 156
Control Line Speed Gene Hempel THE FUN back high-tech Speed article few selected old pros beginner would like build fly Jet model thats simple build easy run begin lets get rid some myths about Jets 1 Jets dangerous Wrong Jets noisy scare people first really safer screaming piston engine few precautions Avoid coming contact high-tension lead ignition coil good treatment hangover useful starting heart following cardiac arrest cant think other useful reason doing end flight dont pick up model engine Unless extreme ly slow learner will once 4eep valuable sensitive body parts away force jet blast 2 Jets hard start require expensive sophisticated equipment critical adjust Wrong fuel mixtures suggest ed later column jet engine will con sistently start two three strokes good tire pump run smoothly throughout flight Jet engines very cantankerous gasoline fable came highly-modified competition engines pain backside start fancy compressed air system 3 Cant get parts engines readily available Initial cost little high exception reed valve everything else can last lifetime Mail stamped selfaddressed envelope P&G Metal Products information address later Model construction fuel tank made brass shim stock 007- 010 thickness Cut out block wood x 1 x 10 sand surfaces smooth Using wood block pattern mark brass what will B B n 0 0 0 18-IN 00 TUBING 18-IN WIRE SKID FUEL TANK 1 1 10-IN J 007 BRASS SHIM STOCK WING DR-IN BASSWOOD YI K [II BALSA FILLER 3132-IN DO TUBING BELLCRANK AND LINE GUIDE MOUNTED BELOW PHIRE PHART DYNAJET SPORT SPEED LENGTH 24 IN SPAN 20 IN DESIGNED BY CHARLIE DAVIS COPYRIGHT 1906 Os GENE HEMPE x 1 B-IN DJRAMINUM MOUNT FRONT AND BEAR K 2 N BASSISOOD TB TC lOIN PBWGDDSTAB MONB NT STRAP 020 SCAINLESS STECL MADE EROS I-aSK CLAMP II II\I BALSA F LXR EEk ATISA WIT, DACRON IS NYLON CORD 3 32-IN WIRE SKO Zj N PRESSURE FITTING 1 IN GD S TIBING WRAP W 1- COPPER W BE AND SI EIl 0255 Gene notes plane will never set anyAMA Jet Speed recordsbut its heck lot fun fly perfectJettrainerand introduction toCLSpeed flying Asharp eyewill note photo isa shadow atopthefuselage portions thewing stab layer insulationthe jet pipe gets red hot inside surface sharp instrument along corners block Now bend along marks 900 metal brake clamping between two pieces metal wood strips tank can done piece find easier make three pieces part consisting four sides overlapping tab separate pieces front rear tank Clamp bent metal around wood block solder along overlapping joint Cut one-inch square piece brass push wood block back fraction front end insert square brass just inside front end tank solder place Remove wood block best done inserting wood screw its opposite end pulling out pliers Drill A-in hole fuel pickup tube 3A2-in vent Solder place shown drawing fuel pickup 70 Model Aviation Modifying stock Dynajet head accept mounting strap last three fins turned down diameter 020 less fin just front Three things 1 1/s-in brass tube sol dered flowiector quick-disconnect starting pump 2 Sparkplug retaining nut turned down halt its original thick- Pressure fitting arrow silver-soldered ness eliminate hot spot com- jet pipe used pressurize fuel bustion chamber 3 11/z-in tube being tankBesureitsmountedabovethecenter used helpputsome camberintothe reed- line engine Author Hempel has lots valve petals ensure good seal information column Control Line Handle STAINLESS STEEL CABLE 175 LB TEST S Hi-Tech Design ComfortableCompact Engineered Long Life S WItI- RENGTH KMultiple Line Spacing ALLOY Sensitivity Control 4For Manufactured Sagan Industries Inc 3614 35th St LIC NY 11106 tube should extend five inches back fuel tank Cut another square brass back end will fit just inside Hold place strip masking tape tack-solder corners Remove tape finish solder ing Small tabs soldered outboard side secure tank fuselage crutch wood screws Wing construction 3A-in basswood Its very important make symmetrical lift ing airfoil Jet disaster extremely un stable familiar solid wing construction method Cut Out wing blank lay flat surface draw line along leading trailing edges half way through thickness Calculate 40% wing chord leading edge mark point wing tip root wing Example Wing chord x 040 XXX Join two points solid line both top bottom wing blank Using lines reference points air foil can carved wood rasp razor plane However prefer use one-inch belt sander rough finish complete sandpaper hand Note prefer leave bottom center section uncarved method makes easier attach wing fuselage requiring notch crutch rather having cut contour match es airfoil fuselage crutch A-in basswood Cut out front rear engine supports -in duraluminum thats hard aluminum soft stuff cut notches inboard side fuselage crutch tbey will flush surface mounting rings made large hose clamps 025-in stainless steel simple method laying out ring wrap masking tape around engine mount will fit Cut out A-in section tape remove engine place metal strip gives exact cir cumference Bend tabs metal beyond ends tape mounting strap just made very springy will hard close mounting engine solve problem put machine screw through holes tabs strap held circular shape heat torch over gas burner kitchen stove will tend retain its shape strength after cools stabilizer A-in plywood hinged using dacron nylon cord laced figureeight motion Mount choice control horn time Dont use plastic may melt soften engine heat find proper location wing mount engine temporarily attach tank tail find CO model prefer balance leading edge wing model should slightly nose-heavy point Cut notches top fuselage crutch wing tail wing tail glued crutch Titebond some other aliphatic white glue secured wood screws also works well mounting skid tank skids both wings inlaid wood held place epoxy Note very critical must installed model pussycat skid off dolly Without youre excitement flood Alka Seltzer factory control system external mounted under wing Inlay piece /-in alumi num extra strength although probably isnt necessary speeds stock engine will turn bellcrank control horn avail able local hobby shop Dont waste time fancy paint job because fuel mixture will take warts off frog Two coats clear polyurethane sufficient few items check jet engine make life less frustrating Check holes flowjector best results holes should size No 57 drill bit too small drill out too large solder up redrill next item spark plug plug held place large nut inside combus tion chamber creates hot spot will contribute burning petals reed valve adjacent spark plug Either face nut off lathe grind down thickness just enough hold plug about Az /-in thick flowjector comes threaded area used screw tire pump excite ment noise fury difficult discon nect screwed-on connection quickly An aiter nate method drill small /-in hole insert piece 1-in tubing solder place air supply can attached piece fuel tubing can pulled off quickly engine can mounted strap formed around combustion chamber just front spark plug Another method machine last three fins head 020 less fin front shown photos lathe isnt available head can mounted drill press A-20 bolt thin plywood washer protect face turned down carefully handheld file easy starting reeds must have good seal over ports requires petals slightly bent forwardbut must equal will seal accomplish cut off small section 1 A-in pipe about inch long Place flat surface lay reed centered over piece pipe finger press center reed forc ing down about -in piece pipe several times petals will bent forward equally engine will run well suction pressure system preferable accomplish drill A-in hole combustion chamber about same distance back head spark plug Insert small piece A6-in OD tubing reinforced wrapping copper wire portion outside combustion chamber silver solder place pressure fitting connected tank vent small-size silicone fuel tubing engine little harder start pressure five six pump strokes instead two three system gives much consistent fuel feed adds four five miles per hour Fuel mixture Over last year have found two mixtures easy-starting run consistently have good power first mixture 35% alcohol 35% methylethylketone MEK 15% nitromethane 15% propylene oxide pressure use 039-in metering jet suction 058-in metering jet second fuel mixture recently tried 80% alcohol 20% MEK using 038 metering jet pressure 058-060 suction very little difference performance second mixture considerably cheaper about $350 gailon recommend nitro propylene oxide mixtures used all-out Speed models stock engine Metering jets smaller-sized jets used pressure available P&G Metal ProdContinued page 156 August 1986 71 IDEAL FOR SPORT FLYING AND COMPETITION AT BETTER HOBBY SHOPS AMA WiNG NUMBERS AMA number single decal Ready apply AMA171120L1 Black letters Clear plastic peel & stIck CL Speed/Hem pel Continued page 71 ucts larger-sized jets will have machined Use brass 10-32 machine screw Cut desired length drill out almost entire length No 42 drill bit drill very last portion desired drill size Machine off enough threads fuel tub ing slide Starting procedure Utilizing fuel mixtures listed previously engine very easy start Attach air supply Model T coil ignition Raise nose model about 450 turn coil pump should start two four pumps Launching model simply letting go either straight ahead angled out slightly very important pilot back up keep lines tight first l/ lap Remember thrust push behind rather pull line tension must maintained until speed builds up centrifugal force keeps model mov ing straight fly model 65-ft 018 single-strand solid wire two pieces equipment will need normally modelers tool box piece lA-in steel pipe good hammer jet pipes bend hard land ing can straightened forcing pipe inside jet pipe smoothing out dents hammer Give Jet try might just get hooked first weekend out put over 30 flights SupplIers needed supplies Sears Auto Centerhigh-volume tire pump JC Whitney Model T ignition coil Paint storeMEK stan dard brands chain Jet EngineP&G Metal Products 301 North Yale Dr Garland TX 70542 months column written help Charlie Davis noted Jet modeler Speed flier has motivation behind hav ing fun flying Speed instead stand ing front milling machine lathe months column copyright 1986 Gene Hempel Gene Hempel 301 N Yale Dr Garland TX 75042 Quickie Rat/Williams Continued page 74 through center venturi goes saying rules prohibit troduction air engine through passage other venturi designate minimum length above below spraybar specified bore must maintained also supply 10% fuel event requirements allow us race comfortably 100-mph range provide us simple reliable system promotes success competitors no matter what level Clear Lake Line Winders plan sponsor Quickie Rat unofficial event Lake Charles Nats summer youre going Nats wed like have come race us Construction airplane pretty straightforward just arent whole lot parts deal wont take couple days build wing built epoxying Tite bonding piece -in medium-to-firm balsa onto 2-in plywood wing bottom bottom should continuous piece plywood dont butt two 12-in pieces gether center can substitute 1/16 plywood wing bottom like used build way Ive decided 2 works just well saves some weight Rout out center balsa down plywood through inset the-in plywood belicrank mount/main spar epoxy After has cured sand wing shape bringing trailing edge down plywood skin construction method gives fairly light rigid wing trailing edge firm enough grasped during pitting damage Rout out recess outboard tip bury about 1 oz lead wing tip like wing can covered layer 1 5-oz glass cloth adhered K&B clear Superpoxy fuselage isnt evenings work either engine mounts fuselage Youll need piece 18in maple upper engine mount shorter piece lower Fill between mounts -in balsa add -in ply wood sub-rudder/tail skid piece plywood inboard side engine take power sander Rout recess fuselage/engine mounts landing gear wire lay same time cut engine plate -in aluminum fit engine Bend landing gear wire upper end fits upper engine mount bend will keep rotating aluminum engine plate holds place Ive using tAz music wire forthe landing gear also works fine stab elevator cut -in basswood Ive shown sewn hinges anything will Add Vt-in plywood rudder like Mount wing stab fuselage using liberal amounts epoxy nylon tape check carefully proper alignment like wing go through fuselage rather mounted top upper engine mount its just safer sturdier Add -in plywood lead-out gnide youre just about done woodwork Give whole thing couple coats K&B Superpoxy clear set aside thats left build tank shut off favorite type tip skids like bolt bellcrank Ive re cently taken using silicone sealer attach tank body course standard add some hooks rubberband thing does give easy access repair leaks like since arent running pressure thats just critical planes really quite durable have eight years old use loaner 156 Model Aviation r ROUSH KITS TaylorCraft Full span 108 Area 1670 Clipped 84 Area 1300 Power 75 12 Cu Bales & Pl 2 lbs $11995 Super Sport 120 Span 73 Area 960 Power 75 12 cv $9995 Super Kwik Fli Span 70 Area 927 Power 75 12 Cu $8995 Two Ugly Stick span 70 Area 1290 Power 75 12 Cu $9995 Jr Sticks span 72 Area 1060 Power 75 12 Cu $7995 Direct Sales Only Prices Include Shipping Send $100 Catalog ROUSH MFG 1726 Dywood St SE Canton Ohio 44707 2104644610 RUBBER POWERED FLYING MODELS KITS S SSORIES KITSTISSUE -LUBE-PROPELLERS SHAFTS BEARINGS WHEELS LARGE CATALOG OF QUALITY SUPPLIES KITS AND PLANS FOR RUBBER POWERED MODELS ALSO CO-2 ENGINES BLIMPS ELECTRIC AND MORE FULL C4T4LOC $209 NEW NO 619 448-1818 j Peck-Pelymers - BOX 2498 -MA LA MESA CA 920414 I2 includes postage & 8 TOr