Radio Control O1dTimers Dee Mathews IS IT permissible finish Red Zephyr yellow black select Red Zephyr model month well known Most anyone has observed flight Herb Greenburgs classic recog nizes superb thermal hanger thanks its very long tail-moment highaspect-ratio wing has undeserv edly bad reputation glaring structural weakness Its construction light simple economical Sadly contact something solid tall grass nose inclined separate front wing leading edge have observed mishap least three times John Pond claims 100% probability little ingenuity will correct problem Although comparatively unorthodox use three-ply luan mahogany base nose end illustrated Ole Reliable MA 6-78 makes Zephyr strong house Carried rear cabin bulkhead rear fuselage frame formed 3/16 spruce plyopen-frame hybrid construction quite satisfactory added benefit additional weight front Zephyr tends tail-heavy anything forward CG about 30-35% chord dividend Other suggested changes illustrated three-view strongly recommend converting four-spar wing shear webs rather original 1/32 sheet HERB GREENBERS RED ZEPHYR KITTED BY SCIENTIFIC MODELS 1936 BROWN IR 1/2 THROTTLE STRUCTURAL MOOS DRAWN AS SUGGESTED SPAN72 CI-IOROICENTER 10 7/8 AREA 660S0 IN SAM POWER 23 IN3 MAX FUSE WIDTH 41/4 LENSTH 55 U U CLARK Y SECTION NO SCALE V3456 7891011 D-tube wing Also note rudder elevator changes drawing Although solid sheet moving surfaces would simple strong might aggravate CG problem resultant model excellent both sport competitive role Stop thing traditional method shut-off limited engine run events device discontinue flow fuel tank During ignition era switch triggered clockwork pneumatic timer interrupt electrical circuit advent glow diesel ignition began starve off powerplants Interrupting motor run shut-off valve simple reliable relatively accurate However several distinct problems associated leaning out stop frequent destruction glow plug Old hands free flight learned long ago high-nitro fuel combined hot weather will destroy plug nearly flight using squeeze-off timer Another less understood problem method stopping enginebecame critical newer Schnuerle powerContinued page 101 March1979 33 Sven Persson foremost Swedish engine collector Red Zephyr powered Micron 5 later converted RC Assist Webra 40 up front Long tapered wing panels unique Doc extolls virtues flood-off because does introduce plug engine wear factors leaning out glow fuel Positive arrangement shown Dr James Buice *Penalty cut shall loss position fliers finishing behind cut move up position *Two cuts disqualify flier heat o points Scoring shall same whether timing equipment used 7 Lone fliers will required complete ten laps unless CD exercises option order landing deem ten laps completed 8 In event mid-air contact starter will direct involved ships land immediately safety inspection 9 The contest director will disqualify aircraft deems unsafe flown unsafe manner 10 Contestants will allowed backup aircraft may used original entry becomes unserviceable urged backup same frequency original Aircraft Specifications 1 Engine shall 15 cu stock front rotor non Schnuerle plain bearing carburetor throttle furnished manufacturer 2 The following kitted aircraft eligible entry Sig Doubler II B Sig Super Sport C Sig Klipper D Sig Colt E Michigan Hobby Hangar Quickie F Midwest foam Cardinal 3 Original design modified kit eligible meet following mini mum specifications Design conventional tractor type fuselage wing horizontal vertical stabilizers vee tail B Wing shall constant chord constant thickness minimum dimensions 7/I thickness 300 sq area C Minimum fuselage dimensions measured within wing root shall 1 Width x 4 Height 4 Width X 1 Height Minimum height excludes canopy used 4 Minimum control shall three-chan nel Aileron elevator throttle rud der elevator throttle 5 Landing gear optional Thats month go fast turn left Dave Lane 4477 W 136th St Haw thorne CA 90250 RC Old Timer/Mathews continued page 33 plants engines can permanently damaged lean-run situation highly intolerant heat friction manufacturers instructions hint danger overheated-lean run re member lubricant fuel Now can flood off pres surized fuel systems allowed SAM events Dr James Buice medical doctor Fort Worth has developed clever solution uses IV tubing stopcock surplus hospital item check OR supply nurse connected pen bladder Tatone catalogue item stopcock opened servo allowing fuel previously pumped blad der squirt engine intake flood ing off Although stopcocks thrown away almost daily larger hospitals Dr Buice suggests spring clothespin could pulled open servo accomplish same purpose subject disposable sup plies OR let mention discard 50-cc disposable syringes after surgery perfect size inflating pen bladders pacifiers also have used 5- 10-cc disposable syringes glue guns years Since needle left Id suggest using new ones avoid possible contam ination big ones used inject rubber IV tubing cannot have cells just wash out Several builders have written concerning 2-in bolt used hold stab onto rear post Ole Reliable some pencil wrote 4 X 40 nylon though knew available 2-in length should plain oldfashioned steel bolt thing does hold tail through piece outer Nyrod Nothing exotic about subject hardware used published designs should also mention IM Products prebent H-2 wire undercarriage units specified several articles once again being im ported Japan MRC has stock line also contains prebent units several other sizes ranging wheel-to-wheel widths 300 mm 550 mm Since several readers have expressed appreciation simple rule six gave converting cc let share another quicky Try 25 way get inches meters straight 25 cm per 10 inches 25 cm inch etc decimal just moves left metric unit gets larger ie H-2 300 mm landing gear also 30cm 3 meter 3/lOths unit also 12 inches across 300 divided 25 Coming other way multiply 12 inches times 25 300mm Some exotic tools current catalogue Brookstone Co 127 Vose Farm Road Peterborough NH 03458 loaded tools unusual highly useful Three examples 1 A 2 48 aluminum ruler marked l/l6ths Absolutely great truing edges balsa sheet checking bows warps 2 An aluminum pantograph gadget jointed arms will enlarge reduce drawings Pantographs normally little plastic toy unit precision tool Using 26 variable settings can reduce enlarge plans pictures drawings etc 1/10th 10 times does trace out line original pantograph retraces simultaneously desired scale onto another surface 3 The last item Arkansas Stone sharpening cutting edges Used thin coat machine oil its surface soft Arkansas stone will put edge super sharp good quality boxed Arkansas Stone investment safety dull cutting edge dangerous dull edge much difficult control invariably cuts instead work Dont go through life dull tool first March 1979 101 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andrews Aircraft Model Co Inc US Ete 1& North St Topalield Mass 01983 887-8541 RC Pylon/Lane continued page 32 Support AMA Price $3995 moat kit per dollar- har em slogans taught us Dental School Dee B Mathews 506 S Walnut Greensburg KS 67054 Taming Autogiro/Kuhnle continued page 38 located slightly forward rotor force resulting nose-down pitching moment counterbalanced setting stabilizer pushed tail down same force arrangement used fixed wing planes except rotor force replaces combined lift-drag force wing good wing has relatively little drag lift-drag resultant almost vertical CG appears almost directly below wings center lift churning rotor blades create large amounts drag rotor force inclined relatively large angle respect vertical addition rotor usually located much higher above CG wing Because two factors though CG located slightly forward rotor force CG will located relatively large distance front rotors center giv ing erroneous impression center lift forward rotors cen ter proper location CG autogiro determined flight testing about three inches forward center rotor held loosely rotor hub fuselage hangs nose down angle about 20 degrees horizontal rotor disc tips back about 18 degrees thus confirming CG should lie slightly forward line drawn through center rotor perpen dicular plane blade tips rotate autogiros forward speed causes rotor disc tilt backward respect rotor shaft rotor disc also tilts sideways high retreating blade side due interaction between ward speed coning angle blades rotor force tilted side ways tending roll autogiro away retreating blade side rotor autogiro turns clockwise seen above side tilt rotor disc tries roll giro left can counteracted devon trim found satisfactory tilt top rotor shaft about three degrees retreating blade side right side Before building autogiro searched through large collection model maga zines found little useful information However did find book Aero dynamics Helicopter Gessow Myers Frederick Ungar Publishing Co NY very helpful understanding rotor blade motion [When writing advertisers mention read about Model Aviation CL ScalelGretz continued page 44 metering jet through spray orifices metered charge mixed air resulting combustible mix ture fuel air under pressure opens valve passes com bustion chamber fired spark plug receives its initial electric impulse external spark coil pressure resulting combustion closes valve sets up pressure wave tail pipe engine Once initial charge has inducted fired above opera tion automatic No further external forced air supply spark required pressure wave set up exhaust pipe firing initial charge cyclical nature first becomes negative pressure drawing another tered charge gasoline air through valve combustion chamber next becomes positive pressure closing valve firing new charge air hot gasses re maining previous combustion process repeated automatically rate 220-240 times per second long gasoline air supplied Well let Sam finish story unique brand CL Scale flying XF-92A weighs 6 lbs complete flies approximately 21 laps speed 85-90 mph built model 1974 using old set plans Air Trails magazine 1954 scale 1 inch foot has wingspan 31 inches 44 inches length Its built crutch using plywood formers bal sa planking Its finished Aero-Gloss white Air Force markings model lined internally layer asbestos paper two layers heavy-duty aluminum Reynolds Wrap foil using water-glass adhesive Around Dyna-Jet aluminum shroud 020 thick e between Dyna-Jet shroud approximately 1/2 between shroud insulation keep model catching fire Waterglass adhesive will burn As letter model has over 100 flights no problems need pit crew three people start jet holds model presses button spark coil operates air pump stay handle always airborne within two minutes ship lands open hatch pump air around Dyna-Jet cool down have building scale jets since 1954 1 flew XF-92A demo Aerolympics Scale WC 1974 Lakehurst New Jersey April 1978 1 flew model RC CL show Teterboro Airport Jay Gerber AMA HQ took film se quence jet hope will new all-scale film making needs information assistance 102 Model Aviation new CLASSIC kit prom FLYII LAKES Trainer 40 span 0925 power 4 channeLs nc $3495 complete catalog See dealer NOW No107 Fairchild 22 48 span 0915 power 3 channeLs nc $2995 FLYLINE MODELS INC 2020 DORR AVENUE B 2 FAIRFAX VIRGINIA 22031703 5732030 OUR AIM IS TO KEEP SPORT FLYING SPECIALIZING IN OT FF KITS AND ENGINES FOR THE COMPETITOR WE HAVE THE HOT EQUIPMENT s Enterprises PLANES1356 Ervin Road BOATSPO Box 227 CARSPangles Center TRAINSVan Wert OH 45896 4 Joe Guylas 4191 238-2625 WE BUY OR TRADE OLD ENGINES AND KITS
Edition: Model Aviation - 1979/03
Page Numbers: 33, 101, 102
Radio Control O1dTimers Dee Mathews IS IT permissible finish Red Zephyr yellow black select Red Zephyr model month well known Most anyone has observed flight Herb Greenburgs classic recog nizes superb thermal hanger thanks its very long tail-moment highaspect-ratio wing has undeserv edly bad reputation glaring structural weakness Its construction light simple economical Sadly contact something solid tall grass nose inclined separate front wing leading edge have observed mishap least three times John Pond claims 100% probability little ingenuity will correct problem Although comparatively unorthodox use three-ply luan mahogany base nose end illustrated Ole Reliable MA 6-78 makes Zephyr strong house Carried rear cabin bulkhead rear fuselage frame formed 3/16 spruce plyopen-frame hybrid construction quite satisfactory added benefit additional weight front Zephyr tends tail-heavy anything forward CG about 30-35% chord dividend Other suggested changes illustrated three-view strongly recommend converting four-spar wing shear webs rather original 1/32 sheet HERB GREENBERS RED ZEPHYR KITTED BY SCIENTIFIC MODELS 1936 BROWN IR 1/2 THROTTLE STRUCTURAL MOOS DRAWN AS SUGGESTED SPAN72 CI-IOROICENTER 10 7/8 AREA 660S0 IN SAM POWER 23 IN3 MAX FUSE WIDTH 41/4 LENSTH 55 U U CLARK Y SECTION NO SCALE V3456 7891011 D-tube wing Also note rudder elevator changes drawing Although solid sheet moving surfaces would simple strong might aggravate CG problem resultant model excellent both sport competitive role Stop thing traditional method shut-off limited engine run events device discontinue flow fuel tank During ignition era switch triggered clockwork pneumatic timer interrupt electrical circuit advent glow diesel ignition began starve off powerplants Interrupting motor run shut-off valve simple reliable relatively accurate However several distinct problems associated leaning out stop frequent destruction glow plug Old hands free flight learned long ago high-nitro fuel combined hot weather will destroy plug nearly flight using squeeze-off timer Another less understood problem method stopping enginebecame critical newer Schnuerle powerContinued page 101 March1979 33 Sven Persson foremost Swedish engine collector Red Zephyr powered Micron 5 later converted RC Assist Webra 40 up front Long tapered wing panels unique Doc extolls virtues flood-off because does introduce plug engine wear factors leaning out glow fuel Positive arrangement shown Dr James Buice *Penalty cut shall loss position fliers finishing behind cut move up position *Two cuts disqualify flier heat o points Scoring shall same whether timing equipment used 7 Lone fliers will required complete ten laps unless CD exercises option order landing deem ten laps completed 8 In event mid-air contact starter will direct involved ships land immediately safety inspection 9 The contest director will disqualify aircraft deems unsafe flown unsafe manner 10 Contestants will allowed backup aircraft may used original entry becomes unserviceable urged backup same frequency original Aircraft Specifications 1 Engine shall 15 cu stock front rotor non Schnuerle plain bearing carburetor throttle furnished manufacturer 2 The following kitted aircraft eligible entry Sig Doubler II B Sig Super Sport C Sig Klipper D Sig Colt E Michigan Hobby Hangar Quickie F Midwest foam Cardinal 3 Original design modified kit eligible meet following mini mum specifications Design conventional tractor type fuselage wing horizontal vertical stabilizers vee tail B Wing shall constant chord constant thickness minimum dimensions 7/I thickness 300 sq area C Minimum fuselage dimensions measured within wing root shall 1 Width x 4 Height 4 Width X 1 Height Minimum height excludes canopy used 4 Minimum control shall three-chan nel Aileron elevator throttle rud der elevator throttle 5 Landing gear optional Thats month go fast turn left Dave Lane 4477 W 136th St Haw thorne CA 90250 RC Old Timer/Mathews continued page 33 plants engines can permanently damaged lean-run situation highly intolerant heat friction manufacturers instructions hint danger overheated-lean run re member lubricant fuel Now can flood off pres surized fuel systems allowed SAM events Dr James Buice medical doctor Fort Worth has developed clever solution uses IV tubing stopcock surplus hospital item check OR supply nurse connected pen bladder Tatone catalogue item stopcock opened servo allowing fuel previously pumped blad der squirt engine intake flood ing off Although stopcocks thrown away almost daily larger hospitals Dr Buice suggests spring clothespin could pulled open servo accomplish same purpose subject disposable sup plies OR let mention discard 50-cc disposable syringes after surgery perfect size inflating pen bladders pacifiers also have used 5- 10-cc disposable syringes glue guns years Since needle left Id suggest using new ones avoid possible contam ination big ones used inject rubber IV tubing cannot have cells just wash out Several builders have written concerning 2-in bolt used hold stab onto rear post Ole Reliable some pencil wrote 4 X 40 nylon though knew available 2-in length should plain oldfashioned steel bolt thing does hold tail through piece outer Nyrod Nothing exotic about subject hardware used published designs should also mention IM Products prebent H-2 wire undercarriage units specified several articles once again being im ported Japan MRC has stock line also contains prebent units several other sizes ranging wheel-to-wheel widths 300 mm 550 mm Since several readers have expressed appreciation simple rule six gave converting cc let share another quicky Try 25 way get inches meters straight 25 cm per 10 inches 25 cm inch etc decimal just moves left metric unit gets larger ie H-2 300 mm landing gear also 30cm 3 meter 3/lOths unit also 12 inches across 300 divided 25 Coming other way multiply 12 inches times 25 300mm Some exotic tools current catalogue Brookstone Co 127 Vose Farm Road Peterborough NH 03458 loaded tools unusual highly useful Three examples 1 A 2 48 aluminum ruler marked l/l6ths Absolutely great truing edges balsa sheet checking bows warps 2 An aluminum pantograph gadget jointed arms will enlarge reduce drawings Pantographs normally little plastic toy unit precision tool Using 26 variable settings can reduce enlarge plans pictures drawings etc 1/10th 10 times does trace out line original pantograph retraces simultaneously desired scale onto another surface 3 The last item Arkansas Stone sharpening cutting edges Used thin coat machine oil its surface soft Arkansas stone will put edge super sharp good quality boxed Arkansas Stone investment safety dull cutting edge dangerous dull edge much difficult control invariably cuts instead work Dont go through life dull tool first March 1979 101 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andrews Aircraft Model Co Inc US Ete 1& North St Topalield Mass 01983 887-8541 RC Pylon/Lane continued page 32 Support AMA Price $3995 moat kit per dollar- har em slogans taught us Dental School Dee B Mathews 506 S Walnut Greensburg KS 67054 Taming Autogiro/Kuhnle continued page 38 located slightly forward rotor force resulting nose-down pitching moment counterbalanced setting stabilizer pushed tail down same force arrangement used fixed wing planes except rotor force replaces combined lift-drag force wing good wing has relatively little drag lift-drag resultant almost vertical CG appears almost directly below wings center lift churning rotor blades create large amounts drag rotor force inclined relatively large angle respect vertical addition rotor usually located much higher above CG wing Because two factors though CG located slightly forward rotor force CG will located relatively large distance front rotors center giv ing erroneous impression center lift forward rotors cen ter proper location CG autogiro determined flight testing about three inches forward center rotor held loosely rotor hub fuselage hangs nose down angle about 20 degrees horizontal rotor disc tips back about 18 degrees thus confirming CG should lie slightly forward line drawn through center rotor perpen dicular plane blade tips rotate autogiros forward speed causes rotor disc tilt backward respect rotor shaft rotor disc also tilts sideways high retreating blade side due interaction between ward speed coning angle blades rotor force tilted side ways tending roll autogiro away retreating blade side rotor autogiro turns clockwise seen above side tilt rotor disc tries roll giro left can counteracted devon trim found satisfactory tilt top rotor shaft about three degrees retreating blade side right side Before building autogiro searched through large collection model maga zines found little useful information However did find book Aero dynamics Helicopter Gessow Myers Frederick Ungar Publishing Co NY very helpful understanding rotor blade motion [When writing advertisers mention read about Model Aviation CL ScalelGretz continued page 44 metering jet through spray orifices metered charge mixed air resulting combustible mix ture fuel air under pressure opens valve passes com bustion chamber fired spark plug receives its initial electric impulse external spark coil pressure resulting combustion closes valve sets up pressure wave tail pipe engine Once initial charge has inducted fired above opera tion automatic No further external forced air supply spark required pressure wave set up exhaust pipe firing initial charge cyclical nature first becomes negative pressure drawing another tered charge gasoline air through valve combustion chamber next becomes positive pressure closing valve firing new charge air hot gasses re maining previous combustion process repeated automatically rate 220-240 times per second long gasoline air supplied Well let Sam finish story unique brand CL Scale flying XF-92A weighs 6 lbs complete flies approximately 21 laps speed 85-90 mph built model 1974 using old set plans Air Trails magazine 1954 scale 1 inch foot has wingspan 31 inches 44 inches length Its built crutch using plywood formers bal sa planking Its finished Aero-Gloss white Air Force markings model lined internally layer asbestos paper two layers heavy-duty aluminum Reynolds Wrap foil using water-glass adhesive Around Dyna-Jet aluminum shroud 020 thick e between Dyna-Jet shroud approximately 1/2 between shroud insulation keep model catching fire Waterglass adhesive will burn As letter model has over 100 flights no problems need pit crew three people start jet holds model presses button spark coil operates air pump stay handle always airborne within two minutes ship lands open hatch pump air around Dyna-Jet cool down have building scale jets since 1954 1 flew XF-92A demo Aerolympics Scale WC 1974 Lakehurst New Jersey April 1978 1 flew model RC CL show Teterboro Airport Jay Gerber AMA HQ took film se quence jet hope will new all-scale film making needs information assistance 102 Model Aviation new CLASSIC kit prom FLYII LAKES Trainer 40 span 0925 power 4 channeLs nc $3495 complete catalog See dealer NOW No107 Fairchild 22 48 span 0915 power 3 channeLs nc $2995 FLYLINE MODELS INC 2020 DORR AVENUE B 2 FAIRFAX VIRGINIA 22031703 5732030 OUR AIM IS TO KEEP SPORT FLYING SPECIALIZING IN OT FF KITS AND ENGINES FOR THE COMPETITOR WE HAVE THE HOT EQUIPMENT s Enterprises PLANES1356 Ervin Road BOATSPO Box 227 CARSPangles Center TRAINSVan Wert OH 45896 4 Joe Guylas 4191 238-2625 WE BUY OR TRADE OLD ENGINES AND KITS
Edition: Model Aviation - 1979/03
Page Numbers: 33, 101, 102
Radio Control O1dTimers Dee Mathews IS IT permissible finish Red Zephyr yellow black select Red Zephyr model month well known Most anyone has observed flight Herb Greenburgs classic recog nizes superb thermal hanger thanks its very long tail-moment highaspect-ratio wing has undeserv edly bad reputation glaring structural weakness Its construction light simple economical Sadly contact something solid tall grass nose inclined separate front wing leading edge have observed mishap least three times John Pond claims 100% probability little ingenuity will correct problem Although comparatively unorthodox use three-ply luan mahogany base nose end illustrated Ole Reliable MA 6-78 makes Zephyr strong house Carried rear cabin bulkhead rear fuselage frame formed 3/16 spruce plyopen-frame hybrid construction quite satisfactory added benefit additional weight front Zephyr tends tail-heavy anything forward CG about 30-35% chord dividend Other suggested changes illustrated three-view strongly recommend converting four-spar wing shear webs rather original 1/32 sheet HERB GREENBERS RED ZEPHYR KITTED BY SCIENTIFIC MODELS 1936 BROWN IR 1/2 THROTTLE STRUCTURAL MOOS DRAWN AS SUGGESTED SPAN72 CI-IOROICENTER 10 7/8 AREA 660S0 IN SAM POWER 23 IN3 MAX FUSE WIDTH 41/4 LENSTH 55 U U CLARK Y SECTION NO SCALE V3456 7891011 D-tube wing Also note rudder elevator changes drawing Although solid sheet moving surfaces would simple strong might aggravate CG problem resultant model excellent both sport competitive role Stop thing traditional method shut-off limited engine run events device discontinue flow fuel tank During ignition era switch triggered clockwork pneumatic timer interrupt electrical circuit advent glow diesel ignition began starve off powerplants Interrupting motor run shut-off valve simple reliable relatively accurate However several distinct problems associated leaning out stop frequent destruction glow plug Old hands free flight learned long ago high-nitro fuel combined hot weather will destroy plug nearly flight using squeeze-off timer Another less understood problem method stopping enginebecame critical newer Schnuerle powerContinued page 101 March1979 33 Sven Persson foremost Swedish engine collector Red Zephyr powered Micron 5 later converted RC Assist Webra 40 up front Long tapered wing panels unique Doc extolls virtues flood-off because does introduce plug engine wear factors leaning out glow fuel Positive arrangement shown Dr James Buice *Penalty cut shall loss position fliers finishing behind cut move up position *Two cuts disqualify flier heat o points Scoring shall same whether timing equipment used 7 Lone fliers will required complete ten laps unless CD exercises option order landing deem ten laps completed 8 In event mid-air contact starter will direct involved ships land immediately safety inspection 9 The contest director will disqualify aircraft deems unsafe flown unsafe manner 10 Contestants will allowed backup aircraft may used original entry becomes unserviceable urged backup same frequency original Aircraft Specifications 1 Engine shall 15 cu stock front rotor non Schnuerle plain bearing carburetor throttle furnished manufacturer 2 The following kitted aircraft eligible entry Sig Doubler II B Sig Super Sport C Sig Klipper D Sig Colt E Michigan Hobby Hangar Quickie F Midwest foam Cardinal 3 Original design modified kit eligible meet following mini mum specifications Design conventional tractor type fuselage wing horizontal vertical stabilizers vee tail B Wing shall constant chord constant thickness minimum dimensions 7/I thickness 300 sq area C Minimum fuselage dimensions measured within wing root shall 1 Width x 4 Height 4 Width X 1 Height Minimum height excludes canopy used 4 Minimum control shall three-chan nel Aileron elevator throttle rud der elevator throttle 5 Landing gear optional Thats month go fast turn left Dave Lane 4477 W 136th St Haw thorne CA 90250 RC Old Timer/Mathews continued page 33 plants engines can permanently damaged lean-run situation highly intolerant heat friction manufacturers instructions hint danger overheated-lean run re member lubricant fuel Now can flood off pres surized fuel systems allowed SAM events Dr James Buice medical doctor Fort Worth has developed clever solution uses IV tubing stopcock surplus hospital item check OR supply nurse connected pen bladder Tatone catalogue item stopcock opened servo allowing fuel previously pumped blad der squirt engine intake flood ing off Although stopcocks thrown away almost daily larger hospitals Dr Buice suggests spring clothespin could pulled open servo accomplish same purpose subject disposable sup plies OR let mention discard 50-cc disposable syringes after surgery perfect size inflating pen bladders pacifiers also have used 5- 10-cc disposable syringes glue guns years Since needle left Id suggest using new ones avoid possible contam ination big ones used inject rubber IV tubing cannot have cells just wash out Several builders have written concerning 2-in bolt used hold stab onto rear post Ole Reliable some pencil wrote 4 X 40 nylon though knew available 2-in length should plain oldfashioned steel bolt thing does hold tail through piece outer Nyrod Nothing exotic about subject hardware used published designs should also mention IM Products prebent H-2 wire undercarriage units specified several articles once again being im ported Japan MRC has stock line also contains prebent units several other sizes ranging wheel-to-wheel widths 300 mm 550 mm Since several readers have expressed appreciation simple rule six gave converting cc let share another quicky Try 25 way get inches meters straight 25 cm per 10 inches 25 cm inch etc decimal just moves left metric unit gets larger ie H-2 300 mm landing gear also 30cm 3 meter 3/lOths unit also 12 inches across 300 divided 25 Coming other way multiply 12 inches times 25 300mm Some exotic tools current catalogue Brookstone Co 127 Vose Farm Road Peterborough NH 03458 loaded tools unusual highly useful Three examples 1 A 2 48 aluminum ruler marked l/l6ths Absolutely great truing edges balsa sheet checking bows warps 2 An aluminum pantograph gadget jointed arms will enlarge reduce drawings Pantographs normally little plastic toy unit precision tool Using 26 variable settings can reduce enlarge plans pictures drawings etc 1/10th 10 times does trace out line original pantograph retraces simultaneously desired scale onto another surface 3 The last item Arkansas Stone sharpening cutting edges Used thin coat machine oil its surface soft Arkansas stone will put edge super sharp good quality boxed Arkansas Stone investment safety dull cutting edge dangerous dull edge much difficult control invariably cuts instead work Dont go through life dull tool first March 1979 101 Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-BAY dealers sold themSHALL WE SAY MORE Andrews Aircraft Model Co Inc US Ete 1& North St Topalield Mass 01983 887-8541 RC Pylon/Lane continued page 32 Support AMA Price $3995 moat kit per dollar- har em slogans taught us Dental School Dee B Mathews 506 S Walnut Greensburg KS 67054 Taming Autogiro/Kuhnle continued page 38 located slightly forward rotor force resulting nose-down pitching moment counterbalanced setting stabilizer pushed tail down same force arrangement used fixed wing planes except rotor force replaces combined lift-drag force wing good wing has relatively little drag lift-drag resultant almost vertical CG appears almost directly below wings center lift churning rotor blades create large amounts drag rotor force inclined relatively large angle respect vertical addition rotor usually located much higher above CG wing Because two factors though CG located slightly forward rotor force CG will located relatively large distance front rotors center giv ing erroneous impression center lift forward rotors cen ter proper location CG autogiro determined flight testing about three inches forward center rotor held loosely rotor hub fuselage hangs nose down angle about 20 degrees horizontal rotor disc tips back about 18 degrees thus confirming CG should lie slightly forward line drawn through center rotor perpen dicular plane blade tips rotate autogiros forward speed causes rotor disc tilt backward respect rotor shaft rotor disc also tilts sideways high retreating blade side due interaction between ward speed coning angle blades rotor force tilted side ways tending roll autogiro away retreating blade side rotor autogiro turns clockwise seen above side tilt rotor disc tries roll giro left can counteracted devon trim found satisfactory tilt top rotor shaft about three degrees retreating blade side right side Before building autogiro searched through large collection model maga zines found little useful information However did find book Aero dynamics Helicopter Gessow Myers Frederick Ungar Publishing Co NY very helpful understanding rotor blade motion [When writing advertisers mention read about Model Aviation CL ScalelGretz continued page 44 metering jet through spray orifices metered charge mixed air resulting combustible mix ture fuel air under pressure opens valve passes com bustion chamber fired spark plug receives its initial electric impulse external spark coil pressure resulting combustion closes valve sets up pressure wave tail pipe engine Once initial charge has inducted fired above opera tion automatic No further external forced air supply spark required pressure wave set up exhaust pipe firing initial charge cyclical nature first becomes negative pressure drawing another tered charge gasoline air through valve combustion chamber next becomes positive pressure closing valve firing new charge air hot gasses re maining previous combustion process repeated automatically rate 220-240 times per second long gasoline air supplied Well let Sam finish story unique brand CL Scale flying XF-92A weighs 6 lbs complete flies approximately 21 laps speed 85-90 mph built model 1974 using old set plans Air Trails magazine 1954 scale 1 inch foot has wingspan 31 inches 44 inches length Its built crutch using plywood formers bal sa planking Its finished Aero-Gloss white Air Force markings model lined internally layer asbestos paper two layers heavy-duty aluminum Reynolds Wrap foil using water-glass adhesive Around Dyna-Jet aluminum shroud 020 thick e between Dyna-Jet shroud approximately 1/2 between shroud insulation keep model catching fire Waterglass adhesive will burn As letter model has over 100 flights no problems need pit crew three people start jet holds model presses button spark coil operates air pump stay handle always airborne within two minutes ship lands open hatch pump air around Dyna-Jet cool down have building scale jets since 1954 1 flew XF-92A demo Aerolympics Scale WC 1974 Lakehurst New Jersey April 1978 1 flew model RC CL show Teterboro Airport Jay Gerber AMA HQ took film se quence jet hope will new all-scale film making needs information assistance 102 Model Aviation new CLASSIC kit prom FLYII LAKES Trainer 40 span 0925 power 4 channeLs nc $3495 complete catalog See dealer NOW No107 Fairchild 22 48 span 0915 power 3 channeLs nc $2995 FLYLINE MODELS INC 2020 DORR AVENUE B 2 FAIRFAX VIRGINIA 22031703 5732030 OUR AIM IS TO KEEP SPORT FLYING SPECIALIZING IN OT FF KITS AND ENGINES FOR THE COMPETITOR WE HAVE THE HOT EQUIPMENT s Enterprises PLANES1356 Ervin Road BOATSPO Box 227 CARSPangles Center TRAINSVan Wert OH 45896 4 Joe Guylas 4191 238-2625 WE BUY OR TRADE OLD ENGINES AND KITS