Control Line. Speed Gene Hempel & TomUpton AFTER Sam Stopwatchs fantastic 199mph flight last column decided clean up act have two guest authors Dub Jett will discuss taching techniques Patrick Hemple will describe 194mph B ship Dub Jett Back stone ages speed flying relaxing glow plugs replaced about often plugs car taching session quite event whole club full people gathered local hobby shop compare engines great social event because tach whole citya strobe worked dark always needing calibration Nevertheless much learned days plenty learn close contact com munication fellow speed fliers tremendous watch some greats tricks dark front old strobe its quite sight see prop stop dead still 20000 rpm guess good thing didnt know too much because us could have afforded knowledge have now fact brings mind subject storytaching too us have whole clubs speed fliers sit around dark run engines have means good interchange information between speed fliers tool obtaining own goals getting much out engines airplanes possible necessary however have tach suitable needs know use before can get much use First choose tach port0 -i 1 DRAWNBY ICK EL DESIGNED BY N HEMPEL & G HEMPEL K&B 29 NATIONAL SENIOR CLASS RECORD HOLDER 19264 MPH 225I L_____________ 1025575 able durable enough banged around tool box losing its calibration Second get can use need itday nightand can sure accurate rpm Third sure doesnt affect engine some direct drive tachs finally compare tach regularly someone elses recommend good mechanical di rect-drive type wide range wont have guess higher rpm Light tachs reed tachs strobe lights sound etc acceptable know read consistent accurate Dont expect precision Continued page 96 Former Stunt flier Brian Bitn& turned 14248 mph Peta luma CA contest Rossi 15powered FAI job hisfirst speed model ENGINETACH PROPNO PIPE RPMPIPE RPMSPEED 0495-3 COX GRAY2600094 PPROTO 28000 118 CUTT04327000MINI 109 156-7 REV-UP2300027000170 297IOTOP FL2000023000190 21 500MINI150PROTO MINI155 F-40 408-9N REV-UP2000021000 180 C 659-13 REV-UPMINI CUTT08-I320000200 04915 29.75% NITRO 40 65-70%NITRO August1978 33 Two asymmetric FAI jobs built Canadian FAI team member Sam Burke Patterned loosely after Emil Rumpels Kingfisher theyre pow ered modified Rossi 15scase pressure modified pipe namic chord MAC non-tapered wing simply wing chord leading edge trailing edge distance tapered wing MAC located inboard mean chord chord measured half distance wing tip fuselage centerline tapered wings meas ure MAC about 45% distance fuselage centerline wing tip pure delta measure MAC 33% fuselage-tip distance tail moment arm measured tween quarter-chord points wing tail quarter-chord point point 25% back leading edge MAC surface larger tail volume ratio effective will tail Some sam ple ratios Aircraft AF2S Guardian Al H Skyraider Short Seamew MO-l AM-l Mauler A-7 Corsair II F-4 Phantom II Note higher-powered propel ler aircraft have tail volume ratios exceed ing 45 An MO-i model Vt 41 can stalled doesnt have flaps Flaps force nose down require larger tail moment compensate balance point Mauler flaps would critical model larger tail volume ratio Any Carrier model normal about half span flaps should have good handling qualities has tail volume ratio over 45 balances 10-20% MAC Without flaps Vt 40 adequate Profile models because lower power larger wings can get V 30 bal ance point 25% MAC develop ing undesirable handling qualities high speeds threw A-7 F-4 demon strate jets have tails too small make good Carrier subjects prop power Without prop nose jets dont need large tail volume stability yet Carrier model ers dont have jets workable propulsion systems just yet Most jets have engines toward aft end usually have long noses balance aircraft put heavy engine nose balance comes problem happy exception norm jet carrier aircraft Supermarine tacker see drawing Developed mid 1940s resembles conventional prop fighters time period much later jets tail quite large nose relatively short wings straight has conventional tail-wheel landing gear may tempted note fuselage circular inlet tail mold fiberglass balsa shell fuselage itself could turned lathe am doing some work throttles right now hope able report next column subjects would particularly like see column drop line Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Speed/Hempel/Upton continued page 33 piece equipment cheap multitude reasons using tach saving wear tear airplanes taching instead test flying working out engine fuel problems engine research impressing friends etc best common use Vtis check out engine see worth flying after fly compare flight time ground rpm example 29s turn 22000 ground 41will go 180 mph excellent consistency 40Given experience using tach will find test flying can reduced 26 product review product review product review High Performance Wheels Retract gear pro vides major decrease drag stallations gaping wheel well holes nullify some gain ultra thin 2/2 wheels can folded against bottom wing skin avoiding need wells can retracted flush providing circular hole skin backed up ring sheet balsa plywood Used fixed gear stead conventional thick rubber-tired wheels provide noticeable decrease drag consequent improvement perform ance nose-gear retraction thin wheels need narrow slot well Thin wheels also attractive fliers Sport Pylon Quick ie 500 Formula Hard bronze hub fits 5/52 wire does create radio noise mold ed rubber tire cannot come off $895 per pair $1340 three Green Aero Products Main Mag Building 1915 Main St Niagara Falls NY 14305 product review product review product review never eliminated some basic rules concerning taching us seem forget time time Lets review 1 Use standard fuel dont vary 2 Use standard prop 3 Wear safety glasses ear protec tion 4 Remove battery 5 Warm engine up before obtaining reading 6 Take steady state reading brief spikes isnt steady have probably got problem 7 If pipe engine always use pipe standard non-varying length 8 Use flying carburetor obey rules may get results can correlated flights Some pitfalls avoid using prop fuel considerably differ ent flying trim b using stand ard propdesignate can easily duplicated keep hanging wall c using standard fuel formula d taching airplane least once sure bench test isnt different Finally get important part article What does need tach go fast As explained before variables no can tell sure just fast should go thing certainyou can go least fast indicated chart everything else right Getting right no doubt will subject column years come Patrick Henipel design can used either B C simply balancing match either full mini-pipe con struction basswood ch 5/16 hard wing 3/16 stab cowl made solid inside cut outleaving about /8 thick shell 3/16 cap glued top As semble finished partsincluding engine pan pipewith rubberbands move wing forward backward until can balance plane level fingers little ahead monoline unit mark everything glue together epoxy Finish hobbypoxy K&B happy flying received letters Sam Burke member Canadian FAI speed team Charles Lieber mem ber American FAI speed team Sam feels speed fliers need exotic equipment well rather just working bit what already have still thinks best performance crease comes practice rather trick modification Amen Sams models loosely patterned after Emil Rumpels Kingfisher utilizing case pres sure centrifugal switch modi fied pipe Charles Liebers feeling speed fliers participat ing FAI speed have yet answer question very well FAI speed par96 Model Aviation CUSTOM TUNED ENGINES COMPETITION ACCESSORIES Cox 0491051 Specialists brochure send 13C stamp Kuslom Kratlsmanship Brochure Box 2699 Laguna Hills CA 92653 714 B30-5162 COLOR POSTERS Twelve stunning 17 x22 pictures - of famous planes missiles action such B-i F-5E F-4 T-43 OV-1OA A-bA F-15 F-16 Titanil lithograph poster ideal framing hanging Only$955/set S,dChckOMouOd,To S PO BOX 458 FLUSHING NY 11352 ticipation seems quite poor around country thing fuel cost surely would cheaper engines should last longer Charles indicates engines performing very well bench after some extensive testing modifications hopes reach speeds high 150s wish both Charles Lieber Sam Burke best luck endeavors FAI speed Doc Jackson has thinkin thats generally dangerous about Ten Best Models Year idea similar what NFFS National Free Flight Society has So anyone has wants ideas send SASE Doc Jackson 523 Meadowbrook Circle St Davids PA 19087 information After writing good words have some would like spread around send us keep asking contest results spe cial feature articles Bob Flies Petal uma Calif came through results pictures all-speed contest February 19 weather almost perfect temperatures low 70s slight breeze Frank Hunt did usual excellent job directing con test several new records estab lished Brian Bitner Covina Calif former stunt flier turned 14248 mph FAI speed Rossi 15his very first speed model Bitners time later beaten Luke Roy Fairfield Calif new record 14432 mph Ed Bridant Bob Elies tried fly open profile proto comments Sure gonna tough beat Juniors Scott Bit ner turned 7706 Junior Profile Proto Doug Hinkley set Senior profile record 6947 mph John Newton turned Power Distribution System Model 677 completely solid-state Unit designed distrib ute power 12 VOC nicad wet-cell bat teries RC accessories addition pro viding power outlets 12-VDC starters PDS 677 provides reversible 12-VDC out put fuel pumps via miniature toggle switch Factory set 15 volts PDS 677 accommodates glow plug rating tween three volts means front panel adjustment Current glow plug automatically increased decreased dependent plug temperature An LED indicator monitors glow plug Complete mating jacks instructions made Plexi glass measures 3x6 Price $3995 & L Electronics PO Box 13434 Albuquerque NM 87112 product review product review product review ALL GRISH PROPELLERS ARE ENGINEERED TO TRUE HELICAL 5-4 7-4 8-4 9-4 9-8 11-4 12-4 5%-3 6-3 7-6 8-6 9-6 10-4 11-6 12-5 CREATE THRUST AND IE PROPELLED BY AIR AT DISCRETION OF 5y3 2 Blade Pusher5A-43045A-4 6-36-4354 6-43548-68541 7-85049-610-6$1 DE 8-8 654 3 Blade Tractor 9-75-3 6-36-4 504 -j 10-6854 3 Blade Pusher 11-8$1 tallic 12-6SiSOr1ade polyesterAluminum Cob boll color767-8 $1 F8-68-8 $125 9-6 10-6 10-4 $150 Pusher 10-6$150 16660 mph squeeze out Jim Rhodes 15937 speed Jon Defries turned 15778 mph B Fred Margarido fuel problems B turned 17251 mph D OPS 60 year chance fly some Texas weather Labor Day weekend Sep tember 2 3 Southwestern Model Plane Championship will held Hobby Park Dallas Speed events will A Profile Proto F40 B B Proto C D Jet Everything record ratio except profile proto information write Linda Wheeler 2400 Lovell Drive Mes quite TX 75150 phone 214-279-3115 next column will devoted cov erage speed events United States Controline Model Airplane Cham pionships Winston-Salem NC June 1718 Gene Hempel Tom Upton 301 N Yale Dr Garland TX 75042 CL Aerobatics/Paul continued page 34 long sanding blocks great shaping flaps elevators Need some weight nose tail plane Try Form-a-Balance high density powder mixed epoxy resin form balance weight model one-pound bottle costs $295 should available local hobby shop could also used wing weight Harry Higley keeps coming up some great little products latest Harrys Handy Hex Key long-reach hex screw wrench wrenches about 11 inches long quite handy reach ing hard get places two sizes 3/32 fits 4-40 5-40 screws 7/64 size fits 6-32 size price $499 per set two Harry also has Harrys Heavy Hub 2-ounce prop nut machined hex bar stock nickel plated Price $239 imag ine drilled tapped hole way through nut could mount inside spinner am going suggest Harry also make nut similar stunt can used directly inside spinner Harry also has Biso Balancer can perform two functions Firstly can used mark equal lengths prop blade Secondly can used balance prop An illustrated instruction sheet included Bisco balancer show use Good idea $145 Glue Screw Weight 1-ounce lead casting especially designed ballast use tip weight other balancing back serrated glue adhesion tapered shape acts wedge under glue can also screwed down using hole middle Price $ 89 set three hobby store doesnt have items write Harry 433 Arquilla August 1 978 97 GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES IN18$700 6 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOUR DEALER USE TO PROPEL AIR fiozrn PROPELLERS PITCH AND AIRFOIL FOR EFFICIENCY 2 Blade Tractor 5-3each AT YOUR DEALER THE PURCHASER G RUSH 0CHN INDIANA 46373 product review product review product review
Edition: Model Aviation - 1978/08
Page Numbers: 33, 96, 97
Control Line. Speed Gene Hempel & TomUpton AFTER Sam Stopwatchs fantastic 199mph flight last column decided clean up act have two guest authors Dub Jett will discuss taching techniques Patrick Hemple will describe 194mph B ship Dub Jett Back stone ages speed flying relaxing glow plugs replaced about often plugs car taching session quite event whole club full people gathered local hobby shop compare engines great social event because tach whole citya strobe worked dark always needing calibration Nevertheless much learned days plenty learn close contact com munication fellow speed fliers tremendous watch some greats tricks dark front old strobe its quite sight see prop stop dead still 20000 rpm guess good thing didnt know too much because us could have afforded knowledge have now fact brings mind subject storytaching too us have whole clubs speed fliers sit around dark run engines have means good interchange information between speed fliers tool obtaining own goals getting much out engines airplanes possible necessary however have tach suitable needs know use before can get much use First choose tach port0 -i 1 DRAWNBY ICK EL DESIGNED BY N HEMPEL & G HEMPEL K&B 29 NATIONAL SENIOR CLASS RECORD HOLDER 19264 MPH 225I L_____________ 1025575 able durable enough banged around tool box losing its calibration Second get can use need itday nightand can sure accurate rpm Third sure doesnt affect engine some direct drive tachs finally compare tach regularly someone elses recommend good mechanical di rect-drive type wide range wont have guess higher rpm Light tachs reed tachs strobe lights sound etc acceptable know read consistent accurate Dont expect precision Continued page 96 Former Stunt flier Brian Bitn& turned 14248 mph Peta luma CA contest Rossi 15powered FAI job hisfirst speed model ENGINETACH PROPNO PIPE RPMPIPE RPMSPEED 0495-3 COX GRAY2600094 PPROTO 28000 118 CUTT04327000MINI 109 156-7 REV-UP2300027000170 297IOTOP FL2000023000190 21 500MINI150PROTO MINI155 F-40 408-9N REV-UP2000021000 180 C 659-13 REV-UPMINI CUTT08-I320000200 04915 29.75% NITRO 40 65-70%NITRO August1978 33 Two asymmetric FAI jobs built Canadian FAI team member Sam Burke Patterned loosely after Emil Rumpels Kingfisher theyre pow ered modified Rossi 15scase pressure modified pipe namic chord MAC non-tapered wing simply wing chord leading edge trailing edge distance tapered wing MAC located inboard mean chord chord measured half distance wing tip fuselage centerline tapered wings meas ure MAC about 45% distance fuselage centerline wing tip pure delta measure MAC 33% fuselage-tip distance tail moment arm measured tween quarter-chord points wing tail quarter-chord point point 25% back leading edge MAC surface larger tail volume ratio effective will tail Some sam ple ratios Aircraft AF2S Guardian Al H Skyraider Short Seamew MO-l AM-l Mauler A-7 Corsair II F-4 Phantom II Note higher-powered propel ler aircraft have tail volume ratios exceed ing 45 An MO-i model Vt 41 can stalled doesnt have flaps Flaps force nose down require larger tail moment compensate balance point Mauler flaps would critical model larger tail volume ratio Any Carrier model normal about half span flaps should have good handling qualities has tail volume ratio over 45 balances 10-20% MAC Without flaps Vt 40 adequate Profile models because lower power larger wings can get V 30 bal ance point 25% MAC develop ing undesirable handling qualities high speeds threw A-7 F-4 demon strate jets have tails too small make good Carrier subjects prop power Without prop nose jets dont need large tail volume stability yet Carrier model ers dont have jets workable propulsion systems just yet Most jets have engines toward aft end usually have long noses balance aircraft put heavy engine nose balance comes problem happy exception norm jet carrier aircraft Supermarine tacker see drawing Developed mid 1940s resembles conventional prop fighters time period much later jets tail quite large nose relatively short wings straight has conventional tail-wheel landing gear may tempted note fuselage circular inlet tail mold fiberglass balsa shell fuselage itself could turned lathe am doing some work throttles right now hope able report next column subjects would particularly like see column drop line Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Speed/Hempel/Upton continued page 33 piece equipment cheap multitude reasons using tach saving wear tear airplanes taching instead test flying working out engine fuel problems engine research impressing friends etc best common use Vtis check out engine see worth flying after fly compare flight time ground rpm example 29s turn 22000 ground 41will go 180 mph excellent consistency 40Given experience using tach will find test flying can reduced 26 product review product review product review High Performance Wheels Retract gear pro vides major decrease drag stallations gaping wheel well holes nullify some gain ultra thin 2/2 wheels can folded against bottom wing skin avoiding need wells can retracted flush providing circular hole skin backed up ring sheet balsa plywood Used fixed gear stead conventional thick rubber-tired wheels provide noticeable decrease drag consequent improvement perform ance nose-gear retraction thin wheels need narrow slot well Thin wheels also attractive fliers Sport Pylon Quick ie 500 Formula Hard bronze hub fits 5/52 wire does create radio noise mold ed rubber tire cannot come off $895 per pair $1340 three Green Aero Products Main Mag Building 1915 Main St Niagara Falls NY 14305 product review product review product review never eliminated some basic rules concerning taching us seem forget time time Lets review 1 Use standard fuel dont vary 2 Use standard prop 3 Wear safety glasses ear protec tion 4 Remove battery 5 Warm engine up before obtaining reading 6 Take steady state reading brief spikes isnt steady have probably got problem 7 If pipe engine always use pipe standard non-varying length 8 Use flying carburetor obey rules may get results can correlated flights Some pitfalls avoid using prop fuel considerably differ ent flying trim b using stand ard propdesignate can easily duplicated keep hanging wall c using standard fuel formula d taching airplane least once sure bench test isnt different Finally get important part article What does need tach go fast As explained before variables no can tell sure just fast should go thing certainyou can go least fast indicated chart everything else right Getting right no doubt will subject column years come Patrick Henipel design can used either B C simply balancing match either full mini-pipe con struction basswood ch 5/16 hard wing 3/16 stab cowl made solid inside cut outleaving about /8 thick shell 3/16 cap glued top As semble finished partsincluding engine pan pipewith rubberbands move wing forward backward until can balance plane level fingers little ahead monoline unit mark everything glue together epoxy Finish hobbypoxy K&B happy flying received letters Sam Burke member Canadian FAI speed team Charles Lieber mem ber American FAI speed team Sam feels speed fliers need exotic equipment well rather just working bit what already have still thinks best performance crease comes practice rather trick modification Amen Sams models loosely patterned after Emil Rumpels Kingfisher utilizing case pres sure centrifugal switch modi fied pipe Charles Liebers feeling speed fliers participat ing FAI speed have yet answer question very well FAI speed par96 Model Aviation CUSTOM TUNED ENGINES COMPETITION ACCESSORIES Cox 0491051 Specialists brochure send 13C stamp Kuslom Kratlsmanship Brochure Box 2699 Laguna Hills CA 92653 714 B30-5162 COLOR POSTERS Twelve stunning 17 x22 pictures - of famous planes missiles action such B-i F-5E F-4 T-43 OV-1OA A-bA F-15 F-16 Titanil lithograph poster ideal framing hanging Only$955/set S,dChckOMouOd,To S PO BOX 458 FLUSHING NY 11352 ticipation seems quite poor around country thing fuel cost surely would cheaper engines should last longer Charles indicates engines performing very well bench after some extensive testing modifications hopes reach speeds high 150s wish both Charles Lieber Sam Burke best luck endeavors FAI speed Doc Jackson has thinkin thats generally dangerous about Ten Best Models Year idea similar what NFFS National Free Flight Society has So anyone has wants ideas send SASE Doc Jackson 523 Meadowbrook Circle St Davids PA 19087 information After writing good words have some would like spread around send us keep asking contest results spe cial feature articles Bob Flies Petal uma Calif came through results pictures all-speed contest February 19 weather almost perfect temperatures low 70s slight breeze Frank Hunt did usual excellent job directing con test several new records estab lished Brian Bitner Covina Calif former stunt flier turned 14248 mph FAI speed Rossi 15his very first speed model Bitners time later beaten Luke Roy Fairfield Calif new record 14432 mph Ed Bridant Bob Elies tried fly open profile proto comments Sure gonna tough beat Juniors Scott Bit ner turned 7706 Junior Profile Proto Doug Hinkley set Senior profile record 6947 mph John Newton turned Power Distribution System Model 677 completely solid-state Unit designed distrib ute power 12 VOC nicad wet-cell bat teries RC accessories addition pro viding power outlets 12-VDC starters PDS 677 provides reversible 12-VDC out put fuel pumps via miniature toggle switch Factory set 15 volts PDS 677 accommodates glow plug rating tween three volts means front panel adjustment Current glow plug automatically increased decreased dependent plug temperature An LED indicator monitors glow plug Complete mating jacks instructions made Plexi glass measures 3x6 Price $3995 & L Electronics PO Box 13434 Albuquerque NM 87112 product review product review product review ALL GRISH PROPELLERS ARE ENGINEERED TO TRUE HELICAL 5-4 7-4 8-4 9-4 9-8 11-4 12-4 5%-3 6-3 7-6 8-6 9-6 10-4 11-6 12-5 CREATE THRUST AND IE PROPELLED BY AIR AT DISCRETION OF 5y3 2 Blade Pusher5A-43045A-4 6-36-4354 6-43548-68541 7-85049-610-6$1 DE 8-8 654 3 Blade Tractor 9-75-3 6-36-4 504 -j 10-6854 3 Blade Pusher 11-8$1 tallic 12-6SiSOr1ade polyesterAluminum Cob boll color767-8 $1 F8-68-8 $125 9-6 10-6 10-4 $150 Pusher 10-6$150 16660 mph squeeze out Jim Rhodes 15937 speed Jon Defries turned 15778 mph B Fred Margarido fuel problems B turned 17251 mph D OPS 60 year chance fly some Texas weather Labor Day weekend Sep tember 2 3 Southwestern Model Plane Championship will held Hobby Park Dallas Speed events will A Profile Proto F40 B B Proto C D Jet Everything record ratio except profile proto information write Linda Wheeler 2400 Lovell Drive Mes quite TX 75150 phone 214-279-3115 next column will devoted cov erage speed events United States Controline Model Airplane Cham pionships Winston-Salem NC June 1718 Gene Hempel Tom Upton 301 N Yale Dr Garland TX 75042 CL Aerobatics/Paul continued page 34 long sanding blocks great shaping flaps elevators Need some weight nose tail plane Try Form-a-Balance high density powder mixed epoxy resin form balance weight model one-pound bottle costs $295 should available local hobby shop could also used wing weight Harry Higley keeps coming up some great little products latest Harrys Handy Hex Key long-reach hex screw wrench wrenches about 11 inches long quite handy reach ing hard get places two sizes 3/32 fits 4-40 5-40 screws 7/64 size fits 6-32 size price $499 per set two Harry also has Harrys Heavy Hub 2-ounce prop nut machined hex bar stock nickel plated Price $239 imag ine drilled tapped hole way through nut could mount inside spinner am going suggest Harry also make nut similar stunt can used directly inside spinner Harry also has Biso Balancer can perform two functions Firstly can used mark equal lengths prop blade Secondly can used balance prop An illustrated instruction sheet included Bisco balancer show use Good idea $145 Glue Screw Weight 1-ounce lead casting especially designed ballast use tip weight other balancing back serrated glue adhesion tapered shape acts wedge under glue can also screwed down using hole middle Price $ 89 set three hobby store doesnt have items write Harry 433 Arquilla August 1 978 97 GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES IN18$700 6 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOUR DEALER USE TO PROPEL AIR fiozrn PROPELLERS PITCH AND AIRFOIL FOR EFFICIENCY 2 Blade Tractor 5-3each AT YOUR DEALER THE PURCHASER G RUSH 0CHN INDIANA 46373 product review product review product review
Edition: Model Aviation - 1978/08
Page Numbers: 33, 96, 97
Control Line. Speed Gene Hempel & TomUpton AFTER Sam Stopwatchs fantastic 199mph flight last column decided clean up act have two guest authors Dub Jett will discuss taching techniques Patrick Hemple will describe 194mph B ship Dub Jett Back stone ages speed flying relaxing glow plugs replaced about often plugs car taching session quite event whole club full people gathered local hobby shop compare engines great social event because tach whole citya strobe worked dark always needing calibration Nevertheless much learned days plenty learn close contact com munication fellow speed fliers tremendous watch some greats tricks dark front old strobe its quite sight see prop stop dead still 20000 rpm guess good thing didnt know too much because us could have afforded knowledge have now fact brings mind subject storytaching too us have whole clubs speed fliers sit around dark run engines have means good interchange information between speed fliers tool obtaining own goals getting much out engines airplanes possible necessary however have tach suitable needs know use before can get much use First choose tach port0 -i 1 DRAWNBY ICK EL DESIGNED BY N HEMPEL & G HEMPEL K&B 29 NATIONAL SENIOR CLASS RECORD HOLDER 19264 MPH 225I L_____________ 1025575 able durable enough banged around tool box losing its calibration Second get can use need itday nightand can sure accurate rpm Third sure doesnt affect engine some direct drive tachs finally compare tach regularly someone elses recommend good mechanical di rect-drive type wide range wont have guess higher rpm Light tachs reed tachs strobe lights sound etc acceptable know read consistent accurate Dont expect precision Continued page 96 Former Stunt flier Brian Bitn& turned 14248 mph Peta luma CA contest Rossi 15powered FAI job hisfirst speed model ENGINETACH PROPNO PIPE RPMPIPE RPMSPEED 0495-3 COX GRAY2600094 PPROTO 28000 118 CUTT04327000MINI 109 156-7 REV-UP2300027000170 297IOTOP FL2000023000190 21 500MINI150PROTO MINI155 F-40 408-9N REV-UP2000021000 180 C 659-13 REV-UPMINI CUTT08-I320000200 04915 29.75% NITRO 40 65-70%NITRO August1978 33 Two asymmetric FAI jobs built Canadian FAI team member Sam Burke Patterned loosely after Emil Rumpels Kingfisher theyre pow ered modified Rossi 15scase pressure modified pipe namic chord MAC non-tapered wing simply wing chord leading edge trailing edge distance tapered wing MAC located inboard mean chord chord measured half distance wing tip fuselage centerline tapered wings meas ure MAC about 45% distance fuselage centerline wing tip pure delta measure MAC 33% fuselage-tip distance tail moment arm measured tween quarter-chord points wing tail quarter-chord point point 25% back leading edge MAC surface larger tail volume ratio effective will tail Some sam ple ratios Aircraft AF2S Guardian Al H Skyraider Short Seamew MO-l AM-l Mauler A-7 Corsair II F-4 Phantom II Note higher-powered propel ler aircraft have tail volume ratios exceed ing 45 An MO-i model Vt 41 can stalled doesnt have flaps Flaps force nose down require larger tail moment compensate balance point Mauler flaps would critical model larger tail volume ratio Any Carrier model normal about half span flaps should have good handling qualities has tail volume ratio over 45 balances 10-20% MAC Without flaps Vt 40 adequate Profile models because lower power larger wings can get V 30 bal ance point 25% MAC develop ing undesirable handling qualities high speeds threw A-7 F-4 demon strate jets have tails too small make good Carrier subjects prop power Without prop nose jets dont need large tail volume stability yet Carrier model ers dont have jets workable propulsion systems just yet Most jets have engines toward aft end usually have long noses balance aircraft put heavy engine nose balance comes problem happy exception norm jet carrier aircraft Supermarine tacker see drawing Developed mid 1940s resembles conventional prop fighters time period much later jets tail quite large nose relatively short wings straight has conventional tail-wheel landing gear may tempted note fuselage circular inlet tail mold fiberglass balsa shell fuselage itself could turned lathe am doing some work throttles right now hope able report next column subjects would particularly like see column drop line Richard L Perry 5016 Angelita Ave Dayton OH 45424 CL Speed/Hempel/Upton continued page 33 piece equipment cheap multitude reasons using tach saving wear tear airplanes taching instead test flying working out engine fuel problems engine research impressing friends etc best common use Vtis check out engine see worth flying after fly compare flight time ground rpm example 29s turn 22000 ground 41will go 180 mph excellent consistency 40Given experience using tach will find test flying can reduced 26 product review product review product review High Performance Wheels Retract gear pro vides major decrease drag stallations gaping wheel well holes nullify some gain ultra thin 2/2 wheels can folded against bottom wing skin avoiding need wells can retracted flush providing circular hole skin backed up ring sheet balsa plywood Used fixed gear stead conventional thick rubber-tired wheels provide noticeable decrease drag consequent improvement perform ance nose-gear retraction thin wheels need narrow slot well Thin wheels also attractive fliers Sport Pylon Quick ie 500 Formula Hard bronze hub fits 5/52 wire does create radio noise mold ed rubber tire cannot come off $895 per pair $1340 three Green Aero Products Main Mag Building 1915 Main St Niagara Falls NY 14305 product review product review product review never eliminated some basic rules concerning taching us seem forget time time Lets review 1 Use standard fuel dont vary 2 Use standard prop 3 Wear safety glasses ear protec tion 4 Remove battery 5 Warm engine up before obtaining reading 6 Take steady state reading brief spikes isnt steady have probably got problem 7 If pipe engine always use pipe standard non-varying length 8 Use flying carburetor obey rules may get results can correlated flights Some pitfalls avoid using prop fuel considerably differ ent flying trim b using stand ard propdesignate can easily duplicated keep hanging wall c using standard fuel formula d taching airplane least once sure bench test isnt different Finally get important part article What does need tach go fast As explained before variables no can tell sure just fast should go thing certainyou can go least fast indicated chart everything else right Getting right no doubt will subject column years come Patrick Henipel design can used either B C simply balancing match either full mini-pipe con struction basswood ch 5/16 hard wing 3/16 stab cowl made solid inside cut outleaving about /8 thick shell 3/16 cap glued top As semble finished partsincluding engine pan pipewith rubberbands move wing forward backward until can balance plane level fingers little ahead monoline unit mark everything glue together epoxy Finish hobbypoxy K&B happy flying received letters Sam Burke member Canadian FAI speed team Charles Lieber mem ber American FAI speed team Sam feels speed fliers need exotic equipment well rather just working bit what already have still thinks best performance crease comes practice rather trick modification Amen Sams models loosely patterned after Emil Rumpels Kingfisher utilizing case pres sure centrifugal switch modi fied pipe Charles Liebers feeling speed fliers participat ing FAI speed have yet answer question very well FAI speed par96 Model Aviation CUSTOM TUNED ENGINES COMPETITION ACCESSORIES Cox 0491051 Specialists brochure send 13C stamp Kuslom Kratlsmanship Brochure Box 2699 Laguna Hills CA 92653 714 B30-5162 COLOR POSTERS Twelve stunning 17 x22 pictures - of famous planes missiles action such B-i F-5E F-4 T-43 OV-1OA A-bA F-15 F-16 Titanil lithograph poster ideal framing hanging Only$955/set S,dChckOMouOd,To S PO BOX 458 FLUSHING NY 11352 ticipation seems quite poor around country thing fuel cost surely would cheaper engines should last longer Charles indicates engines performing very well bench after some extensive testing modifications hopes reach speeds high 150s wish both Charles Lieber Sam Burke best luck endeavors FAI speed Doc Jackson has thinkin thats generally dangerous about Ten Best Models Year idea similar what NFFS National Free Flight Society has So anyone has wants ideas send SASE Doc Jackson 523 Meadowbrook Circle St Davids PA 19087 information After writing good words have some would like spread around send us keep asking contest results spe cial feature articles Bob Flies Petal uma Calif came through results pictures all-speed contest February 19 weather almost perfect temperatures low 70s slight breeze Frank Hunt did usual excellent job directing con test several new records estab lished Brian Bitner Covina Calif former stunt flier turned 14248 mph FAI speed Rossi 15his very first speed model Bitners time later beaten Luke Roy Fairfield Calif new record 14432 mph Ed Bridant Bob Elies tried fly open profile proto comments Sure gonna tough beat Juniors Scott Bit ner turned 7706 Junior Profile Proto Doug Hinkley set Senior profile record 6947 mph John Newton turned Power Distribution System Model 677 completely solid-state Unit designed distrib ute power 12 VOC nicad wet-cell bat teries RC accessories addition pro viding power outlets 12-VDC starters PDS 677 provides reversible 12-VDC out put fuel pumps via miniature toggle switch Factory set 15 volts PDS 677 accommodates glow plug rating tween three volts means front panel adjustment Current glow plug automatically increased decreased dependent plug temperature An LED indicator monitors glow plug Complete mating jacks instructions made Plexi glass measures 3x6 Price $3995 & L Electronics PO Box 13434 Albuquerque NM 87112 product review product review product review ALL GRISH PROPELLERS ARE ENGINEERED TO TRUE HELICAL 5-4 7-4 8-4 9-4 9-8 11-4 12-4 5%-3 6-3 7-6 8-6 9-6 10-4 11-6 12-5 CREATE THRUST AND IE PROPELLED BY AIR AT DISCRETION OF 5y3 2 Blade Pusher5A-43045A-4 6-36-4354 6-43548-68541 7-85049-610-6$1 DE 8-8 654 3 Blade Tractor 9-75-3 6-36-4 504 -j 10-6854 3 Blade Pusher 11-8$1 tallic 12-6SiSOr1ade polyesterAluminum Cob boll color767-8 $1 F8-68-8 $125 9-6 10-6 10-4 $150 Pusher 10-6$150 16660 mph squeeze out Jim Rhodes 15937 speed Jon Defries turned 15778 mph B Fred Margarido fuel problems B turned 17251 mph D OPS 60 year chance fly some Texas weather Labor Day weekend Sep tember 2 3 Southwestern Model Plane Championship will held Hobby Park Dallas Speed events will A Profile Proto F40 B B Proto C D Jet Everything record ratio except profile proto information write Linda Wheeler 2400 Lovell Drive Mes quite TX 75150 phone 214-279-3115 next column will devoted cov erage speed events United States Controline Model Airplane Cham pionships Winston-Salem NC June 1718 Gene Hempel Tom Upton 301 N Yale Dr Garland TX 75042 CL Aerobatics/Paul continued page 34 long sanding blocks great shaping flaps elevators Need some weight nose tail plane Try Form-a-Balance high density powder mixed epoxy resin form balance weight model one-pound bottle costs $295 should available local hobby shop could also used wing weight Harry Higley keeps coming up some great little products latest Harrys Handy Hex Key long-reach hex screw wrench wrenches about 11 inches long quite handy reach ing hard get places two sizes 3/32 fits 4-40 5-40 screws 7/64 size fits 6-32 size price $499 per set two Harry also has Harrys Heavy Hub 2-ounce prop nut machined hex bar stock nickel plated Price $239 imag ine drilled tapped hole way through nut could mount inside spinner am going suggest Harry also make nut similar stunt can used directly inside spinner Harry also has Biso Balancer can perform two functions Firstly can used mark equal lengths prop blade Secondly can used balance prop An illustrated instruction sheet included Bisco balancer show use Good idea $145 Glue Screw Weight 1-ounce lead casting especially designed ballast use tip weight other balancing back serrated glue adhesion tapered shape acts wedge under glue can also screwed down using hole middle Price $ 89 set three hobby store doesnt have items write Harry 433 Arquilla August 1 978 97 GRISH AIRCRAFT TYPE PROPELLERS Made hardwood fully carved true helical pitch airfoil ready sanding ALL SIZES IN18$700 6 8 & 10 PITCH20800 RIGHT HAND221000 ROTATION241300 3/8 BORE AT YOUR DEALER USE TO PROPEL AIR fiozrn PROPELLERS PITCH AND AIRFOIL FOR EFFICIENCY 2 Blade Tractor 5-3each AT YOUR DEALER THE PURCHASER G RUSH 0CHN INDIANA 46373 product review product review product review