t7 1 Racing John Ballard FUEL PROBLEMS 10%-nitro fuel rule has been-running problems product inconsistency have flying now approximately 10 months Midwest area utilizing 10% fuel rule Racing events has slowed events down approximately second seven laps Rat Scale Racing utilizing contest-supplied fuel has caused numerous problems During particular recent contest found out later after analyzing manufacturers economy blend used nitroethane instead nitromethane addition found approximately 6% water fuel oil undetermined origin Serious competitors spend consider able amount time massaging engines maximum output obvi ously propeller-testing restart speed measured 10%-nitromethane fuel blend some cases sum mer fuel supplied contest management found cause severe starting problems plug detonation vote competitors present resulted boxing personal 10% test fuels two one-gallon offi cial jugs using mixture contest Unfortunately cases con test management will purchase hobby shops stock 10% fuel four gallons supplied Racing event two three gallons may different brands occurs con siderable amount scurrying around find brand seems start run satisfactorily climatic conditions prevalent day fairness fuel should least same brand some cases competitors have mixed up own 10% blend taken contest use racing entrants Another serious problem reusing partially-emptied jugs fuel another contest held some future date premiere Midwest flying sites may three separate Racing contests per year unused fuel will retained brought out competitors use once again Obvious ly open gallon jugs fuel ex tremely humid atmospheric conditions large amounts water absorbed mention dust grass other foreign material inadvertently blows jug sits peripheral area Racing circle per sonally take remaining fuel used contest put test batch use break-in fuel sport flying some later date recent poll Midwest competitors objection concept purchasing responsibly-formulated fuel fee additional dollar two per competitor over above cost entry fee sure satisfactory brand fuel Continued page 159 70 Model Aviation Jerry Meyer displays latest pitting equipment prepares fire up Nelson 15-powered Scale Racer starting battery firmly attached archery armprotector strapped armit beats Ace bandage technique look engines venturi reveals needle valve has moved up near lip take Homemade venturi retained RC Pylon engines carb-mounting clamp Larry Wiz Driak Sr uses Ace bandage strap starting battery arm conventional leather qlove starting hand K&B 40 Fast Rat has special non-slip prop hub used fliers overcome tendency standard hub loosen engine over heating during flight Dave Katzmeyer p its K&B-powered Fast Ralph Biddle uses bullhorn Rac-Rat refuels flips prop assistant pit ing circles 84 Nats Don JehIlk Rman has hot-gloveone lead plane s Racing Director Bullhorn needed formetal pan other blind-nut wing officials heard over engine noiseTE glow plug lead attached projects rest Scale model ing world Send ideas photos Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Racing/Ballard Continued page 70 sealed containers supplied Racing events Propeller reevaluation subsequent changes mandatory 10% fuel rule great deal hand-molded meticulously-prepared propellers became obsolete especially evident both Scale Racing Rat Racing think safe say Scale Racing peo pie running between 60% 70% nitro drop 10% heavily-pitched propellers range 7 x 5 7 x 5A pitch found totally unsatisfactory loss range 3000 rpms going 70% nitro 10% nitro using 5 5% pitch must remember majority fiberglass carbon fiber propellers originally virtually completed prod ucts required pitch extreme thinness propeller blade allowing very little area left repitch blade found Scale Racers needed completely new propeller design much lower pitch fiberglass car bon fiber copy Taipan 7 x 5 found have enough blade area allow changing pitch approximately 7 x 4-to-4A pitch considerable amount time saved utilizing testing both FAL Combat competitors well RC Quarter Midget racers Both groups have spent con siderable amount time testing propel lers achieve maximum rpm RC Quarter Midget has fuel restrictions some time few competitors have purchased some very lowpitched Free Flight props 7 x 3 A-to-4 pitch range careful workup engine testing resulted some dramatically improved rpm airspeeds reduction airspeed rpm 40 Rat engine quite dramatic Scale Racing certainly re quired complete propeller evaluation past 55% 65% nitro used 7% 8-inch-pitch propellers allow engine unload air found immediately 10% nitro engine would unload satisfactorily airspeed down considerably Fortunately fiberglass Rat Race pro pellers available racers have enough blade area allow de-pitching 6% 7% pitch immediately found OS 40 Pylon engine capable pulling 7%-pitch propeller whereas K&B 40 ST 40 required slightly less pitchabout / % blade diameter approximately eight inches found U •uummuEEEEEEEU-E--U-U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U K U U U U U. .EEEEE SIG CHAMPION FUEL FREE SHIPPING ON ORDERS OVER $1000 % NITRO 0% PAl 5% 10% 15% 25% 35% 10% 15% PINT $295 $350 $395 $415 $475 $550 $395 $415 QUARTGALLON $425$ 995 $495 $1195 $525 $1395 $595 $1595 $695 $1995 $795 $2395 NEW SIG 4-STROKE FUE $525$1350 $595$1550 L FREIGHT COLLECT 55 GAL DRUM $17500 $24500 $31000 $37400 $50000 $64000 $29500 $35900 U I U U U I THE CHOICE OF CHAMPION FLYERS Dont misled price alone model fuels same Some cut-rate mail order fuel Out selling 10% fuel really contains about 8% nitro skimp costly nitro form g fuel weight basis rather traditional percent-of-volume method Also some ma 0 der fuels blended little 15% total oil Thats OKif geta perfect needle setting everytime otherwise lean run can easily ruin engine Cuts quality like make easy blend com petitively priced fuel really getting quality want over 20 years SIG has blending fuel finest quality ingredients available alcoho 5 995% pure very best grade available nitro use 100% pure get honest port based % volume maximum lubrication get perfect 50150 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel m can made price Dont take word try some judge yourself U See dealer first available order direct Call K 800-247-5008 toll free orders Catalog 47 $3 00 SIG MANUFACTURING CO Montezuma IA 50i7l Prices subject te change wrthOet netice EEEuEEuEEuEUEEEEE satisfactory addition smallblade-area propellers seemed develop highest airspeed Field safety Since speed both Slow Rat Rat racers 120-140 tense field safety paramount Midwest area racing competitors have purchased own battery-operated bullhorn use starting judge addition competitors have found ingenious ways protect arms heavy starting batteries also fingers well-filed fiberglass carbon fiber propellers Lately have seen some rather ingenious holders batteries made archery arm supports U U U I I I I I I I U U also finger protectors made archery finger protectors Several competitors have using wellpadded glove thumb third fourth fingers cut off allowing free move ment hand first second fingers left glove allows easier movement should plug change prop relocation wrench necessary Obviously clearly-visible circle mark ings mandatory allow pilot reference point pit man area can safely catch model dur ing pit stops refuel take off being endangered other aircraft land ing taking off material circle/ October 1985 159 /N 201 SE 12th Street Pompano Beach FL 33080 306-7857978 ENGINEERING THE LANDING GEAR PEOPLE lint @1 kil Imodlog gears dont Ill foor kiggle properly o & ii Engihoonog can solve prublenis * Coals hoill needs & specs yuarsoleod hI * Strong & dorohle wilhsland lho loighuel aiding * 0 & 0 Engineeriog gear will work & koep tour kiggie Ily log * In stock roplacoeoel gear br 051 popolar models Byron Pith Christen Eagle CAP 21 Balsa USA J-3 CUB Air Tech Pawns aed Eagle gsa Big Slick Ckawp Citakna R & B models Snapper Stiogor Snapper Ton Once have tried best wont settle anything Kin-Craft quality products N I1IIII4AETWG 4 411flabby fydarb Look complete line Isv ho hbv shop send catalogue marking have found quite satisfac tory strips /4-inch drywall material drywall plasterboard called area usually sandwiched between two pieces paper Y-inch plasterboard makes excellent tool marking circle pavement usually cut off about five-foot section six inches wide use mark off circle using like piece chalk go back put additional lines markings quite durable during day first rain following con test will remove majority asphalt concrete area important school shopping center parking lots utilized contest sites As always comments welcomed John C Ballard 10102 Kimblewick Dr Louisville KY 40223 CL Speed/Hempel Continued page 71 should wish change perhaps suggestion would welcome As myself would suggest change think elimination pipe monoline would direc tion making attractive old-timers still around may still have interest rekindled came out thought Proto Speed much commend about Proto Speed class Dbut difference addition wing area rule cross section rule generous size perhaps add 3A 6-in landing gear decent-size wheels save ex pensive propellers make easier oldsters actually fly models imagine reflexes re quired 200 mph model make essen tially young mans game other words attract ing young perhaps might worth try attract some old stersjust get people out try out neednt have go whole hog create new class rather perhaps sponsor could found donate some suitable prizes given next Nationals fastest plane conformed informal rules other words prize itself would provide rules planes could timed just other class D model Na tionals Well enough thoughts certainly enjoy col umn Model Aviation Maybe Ill have happier outloook after 85 Nats over Well see Look next Speed column sometime after annual Nats issue MA Gene Hempel 301 N Yale Dr Garland TX 75042 given special assistance prevent unscheduled maneuvers Several mem bers Byron staff continually available coordinate safe flight condi tions overall theme event have fun share exhibition ducted-fan flight Engine run-ups preflight procedures began immediately after pilots meeting 900 am could sense eagerness pilots came afar fly fan-jet models Steve Ort East Peoria IL first become airborne Byron F- 16 model powered Rossi 81 Byrojet fan unit good flight marred minor landing gear problems Steve soon joined others sky full fan-jets unique whining sound pace continued throughout day wide variety ducted-fan models taking skies public address system provided valuable information mod els aloft served hold spectator terest As added incentive reg istered pilot completed first flight received award Byrojet fan unit Saturdays weather fair windy some strong gusts up 25 mph wind direction posed problem since directly perpendicular fixed UPERSALE ngspan 60I72 Flight Weight 5-6 lbs * Removable tail section WEEDHOPPER 60 reg price 114 40 reg price 89 SALE 59 * Easy build * Easy fly * Strong yet light * Stable yet agile * Real aircraft hardware end fabric * Fabric pre-aewn fuel proof * Hardwood pre-drilled y assembly * 3 channels 4 optlonall * Super complete kit lies engine radio tanki right down wheel collars UNSURPASSED DURABILITY R & D ENGINEERING 1245 N Evereff Ridgecrest CA 93555 377-4782 160 Model Aviation Jet Rally/Arro Continued page 81 Blue Orange ow e Camouflage Free shipping US COD add $200 CA residents add 6%
Edition: Model Aviation - 1985/10
Page Numbers: 70, 159, 160
t7 1 Racing John Ballard FUEL PROBLEMS 10%-nitro fuel rule has been-running problems product inconsistency have flying now approximately 10 months Midwest area utilizing 10% fuel rule Racing events has slowed events down approximately second seven laps Rat Scale Racing utilizing contest-supplied fuel has caused numerous problems During particular recent contest found out later after analyzing manufacturers economy blend used nitroethane instead nitromethane addition found approximately 6% water fuel oil undetermined origin Serious competitors spend consider able amount time massaging engines maximum output obvi ously propeller-testing restart speed measured 10%-nitromethane fuel blend some cases sum mer fuel supplied contest management found cause severe starting problems plug detonation vote competitors present resulted boxing personal 10% test fuels two one-gallon offi cial jugs using mixture contest Unfortunately cases con test management will purchase hobby shops stock 10% fuel four gallons supplied Racing event two three gallons may different brands occurs con siderable amount scurrying around find brand seems start run satisfactorily climatic conditions prevalent day fairness fuel should least same brand some cases competitors have mixed up own 10% blend taken contest use racing entrants Another serious problem reusing partially-emptied jugs fuel another contest held some future date premiere Midwest flying sites may three separate Racing contests per year unused fuel will retained brought out competitors use once again Obvious ly open gallon jugs fuel ex tremely humid atmospheric conditions large amounts water absorbed mention dust grass other foreign material inadvertently blows jug sits peripheral area Racing circle per sonally take remaining fuel used contest put test batch use break-in fuel sport flying some later date recent poll Midwest competitors objection concept purchasing responsibly-formulated fuel fee additional dollar two per competitor over above cost entry fee sure satisfactory brand fuel Continued page 159 70 Model Aviation Jerry Meyer displays latest pitting equipment prepares fire up Nelson 15-powered Scale Racer starting battery firmly attached archery armprotector strapped armit beats Ace bandage technique look engines venturi reveals needle valve has moved up near lip take Homemade venturi retained RC Pylon engines carb-mounting clamp Larry Wiz Driak Sr uses Ace bandage strap starting battery arm conventional leather qlove starting hand K&B 40 Fast Rat has special non-slip prop hub used fliers overcome tendency standard hub loosen engine over heating during flight Dave Katzmeyer p its K&B-powered Fast Ralph Biddle uses bullhorn Rac-Rat refuels flips prop assistant pit ing circles 84 Nats Don JehIlk Rman has hot-gloveone lead plane s Racing Director Bullhorn needed formetal pan other blind-nut wing officials heard over engine noiseTE glow plug lead attached projects rest Scale model ing world Send ideas photos Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Racing/Ballard Continued page 70 sealed containers supplied Racing events Propeller reevaluation subsequent changes mandatory 10% fuel rule great deal hand-molded meticulously-prepared propellers became obsolete especially evident both Scale Racing Rat Racing think safe say Scale Racing peo pie running between 60% 70% nitro drop 10% heavily-pitched propellers range 7 x 5 7 x 5A pitch found totally unsatisfactory loss range 3000 rpms going 70% nitro 10% nitro using 5 5% pitch must remember majority fiberglass carbon fiber propellers originally virtually completed prod ucts required pitch extreme thinness propeller blade allowing very little area left repitch blade found Scale Racers needed completely new propeller design much lower pitch fiberglass car bon fiber copy Taipan 7 x 5 found have enough blade area allow changing pitch approximately 7 x 4-to-4A pitch considerable amount time saved utilizing testing both FAL Combat competitors well RC Quarter Midget racers Both groups have spent con siderable amount time testing propel lers achieve maximum rpm RC Quarter Midget has fuel restrictions some time few competitors have purchased some very lowpitched Free Flight props 7 x 3 A-to-4 pitch range careful workup engine testing resulted some dramatically improved rpm airspeeds reduction airspeed rpm 40 Rat engine quite dramatic Scale Racing certainly re quired complete propeller evaluation past 55% 65% nitro used 7% 8-inch-pitch propellers allow engine unload air found immediately 10% nitro engine would unload satisfactorily airspeed down considerably Fortunately fiberglass Rat Race pro pellers available racers have enough blade area allow de-pitching 6% 7% pitch immediately found OS 40 Pylon engine capable pulling 7%-pitch propeller whereas K&B 40 ST 40 required slightly less pitchabout / % blade diameter approximately eight inches found U •uummuEEEEEEEU-E--U-U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U K U U U U U. .EEEEE SIG CHAMPION FUEL FREE SHIPPING ON ORDERS OVER $1000 % NITRO 0% PAl 5% 10% 15% 25% 35% 10% 15% PINT $295 $350 $395 $415 $475 $550 $395 $415 QUARTGALLON $425$ 995 $495 $1195 $525 $1395 $595 $1595 $695 $1995 $795 $2395 NEW SIG 4-STROKE FUE $525$1350 $595$1550 L FREIGHT COLLECT 55 GAL DRUM $17500 $24500 $31000 $37400 $50000 $64000 $29500 $35900 U I U U U I THE CHOICE OF CHAMPION FLYERS Dont misled price alone model fuels same Some cut-rate mail order fuel Out selling 10% fuel really contains about 8% nitro skimp costly nitro form g fuel weight basis rather traditional percent-of-volume method Also some ma 0 der fuels blended little 15% total oil Thats OKif geta perfect needle setting everytime otherwise lean run can easily ruin engine Cuts quality like make easy blend com petitively priced fuel really getting quality want over 20 years SIG has blending fuel finest quality ingredients available alcoho 5 995% pure very best grade available nitro use 100% pure get honest port based % volume maximum lubrication get perfect 50150 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel m can made price Dont take word try some judge yourself U See dealer first available order direct Call K 800-247-5008 toll free orders Catalog 47 $3 00 SIG MANUFACTURING CO Montezuma IA 50i7l Prices subject te change wrthOet netice EEEuEEuEEuEUEEEEE satisfactory addition smallblade-area propellers seemed develop highest airspeed Field safety Since speed both Slow Rat Rat racers 120-140 tense field safety paramount Midwest area racing competitors have purchased own battery-operated bullhorn use starting judge addition competitors have found ingenious ways protect arms heavy starting batteries also fingers well-filed fiberglass carbon fiber propellers Lately have seen some rather ingenious holders batteries made archery arm supports U U U I I I I I I I U U also finger protectors made archery finger protectors Several competitors have using wellpadded glove thumb third fourth fingers cut off allowing free move ment hand first second fingers left glove allows easier movement should plug change prop relocation wrench necessary Obviously clearly-visible circle mark ings mandatory allow pilot reference point pit man area can safely catch model dur ing pit stops refuel take off being endangered other aircraft land ing taking off material circle/ October 1985 159 /N 201 SE 12th Street Pompano Beach FL 33080 306-7857978 ENGINEERING THE LANDING GEAR PEOPLE lint @1 kil Imodlog gears dont Ill foor kiggle properly o & ii Engihoonog can solve prublenis * Coals hoill needs & specs yuarsoleod hI * Strong & dorohle wilhsland lho loighuel aiding * 0 & 0 Engineeriog gear will work & koep tour kiggie Ily log * In stock roplacoeoel gear br 051 popolar models Byron Pith Christen Eagle CAP 21 Balsa USA J-3 CUB Air Tech Pawns aed Eagle gsa Big Slick Ckawp Citakna R & B models Snapper Stiogor Snapper Ton Once have tried best wont settle anything Kin-Craft quality products N I1IIII4AETWG 4 411flabby fydarb Look complete line Isv ho hbv shop send catalogue marking have found quite satisfac tory strips /4-inch drywall material drywall plasterboard called area usually sandwiched between two pieces paper Y-inch plasterboard makes excellent tool marking circle pavement usually cut off about five-foot section six inches wide use mark off circle using like piece chalk go back put additional lines markings quite durable during day first rain following con test will remove majority asphalt concrete area important school shopping center parking lots utilized contest sites As always comments welcomed John C Ballard 10102 Kimblewick Dr Louisville KY 40223 CL Speed/Hempel Continued page 71 should wish change perhaps suggestion would welcome As myself would suggest change think elimination pipe monoline would direc tion making attractive old-timers still around may still have interest rekindled came out thought Proto Speed much commend about Proto Speed class Dbut difference addition wing area rule cross section rule generous size perhaps add 3A 6-in landing gear decent-size wheels save ex pensive propellers make easier oldsters actually fly models imagine reflexes re quired 200 mph model make essen tially young mans game other words attract ing young perhaps might worth try attract some old stersjust get people out try out neednt have go whole hog create new class rather perhaps sponsor could found donate some suitable prizes given next Nationals fastest plane conformed informal rules other words prize itself would provide rules planes could timed just other class D model Na tionals Well enough thoughts certainly enjoy col umn Model Aviation Maybe Ill have happier outloook after 85 Nats over Well see Look next Speed column sometime after annual Nats issue MA Gene Hempel 301 N Yale Dr Garland TX 75042 given special assistance prevent unscheduled maneuvers Several mem bers Byron staff continually available coordinate safe flight condi tions overall theme event have fun share exhibition ducted-fan flight Engine run-ups preflight procedures began immediately after pilots meeting 900 am could sense eagerness pilots came afar fly fan-jet models Steve Ort East Peoria IL first become airborne Byron F- 16 model powered Rossi 81 Byrojet fan unit good flight marred minor landing gear problems Steve soon joined others sky full fan-jets unique whining sound pace continued throughout day wide variety ducted-fan models taking skies public address system provided valuable information mod els aloft served hold spectator terest As added incentive reg istered pilot completed first flight received award Byrojet fan unit Saturdays weather fair windy some strong gusts up 25 mph wind direction posed problem since directly perpendicular fixed UPERSALE ngspan 60I72 Flight Weight 5-6 lbs * Removable tail section WEEDHOPPER 60 reg price 114 40 reg price 89 SALE 59 * Easy build * Easy fly * Strong yet light * Stable yet agile * Real aircraft hardware end fabric * Fabric pre-aewn fuel proof * Hardwood pre-drilled y assembly * 3 channels 4 optlonall * Super complete kit lies engine radio tanki right down wheel collars UNSURPASSED DURABILITY R & D ENGINEERING 1245 N Evereff Ridgecrest CA 93555 377-4782 160 Model Aviation Jet Rally/Arro Continued page 81 Blue Orange ow e Camouflage Free shipping US COD add $200 CA residents add 6%
Edition: Model Aviation - 1985/10
Page Numbers: 70, 159, 160
t7 1 Racing John Ballard FUEL PROBLEMS 10%-nitro fuel rule has been-running problems product inconsistency have flying now approximately 10 months Midwest area utilizing 10% fuel rule Racing events has slowed events down approximately second seven laps Rat Scale Racing utilizing contest-supplied fuel has caused numerous problems During particular recent contest found out later after analyzing manufacturers economy blend used nitroethane instead nitromethane addition found approximately 6% water fuel oil undetermined origin Serious competitors spend consider able amount time massaging engines maximum output obvi ously propeller-testing restart speed measured 10%-nitromethane fuel blend some cases sum mer fuel supplied contest management found cause severe starting problems plug detonation vote competitors present resulted boxing personal 10% test fuels two one-gallon offi cial jugs using mixture contest Unfortunately cases con test management will purchase hobby shops stock 10% fuel four gallons supplied Racing event two three gallons may different brands occurs con siderable amount scurrying around find brand seems start run satisfactorily climatic conditions prevalent day fairness fuel should least same brand some cases competitors have mixed up own 10% blend taken contest use racing entrants Another serious problem reusing partially-emptied jugs fuel another contest held some future date premiere Midwest flying sites may three separate Racing contests per year unused fuel will retained brought out competitors use once again Obvious ly open gallon jugs fuel ex tremely humid atmospheric conditions large amounts water absorbed mention dust grass other foreign material inadvertently blows jug sits peripheral area Racing circle per sonally take remaining fuel used contest put test batch use break-in fuel sport flying some later date recent poll Midwest competitors objection concept purchasing responsibly-formulated fuel fee additional dollar two per competitor over above cost entry fee sure satisfactory brand fuel Continued page 159 70 Model Aviation Jerry Meyer displays latest pitting equipment prepares fire up Nelson 15-powered Scale Racer starting battery firmly attached archery armprotector strapped armit beats Ace bandage technique look engines venturi reveals needle valve has moved up near lip take Homemade venturi retained RC Pylon engines carb-mounting clamp Larry Wiz Driak Sr uses Ace bandage strap starting battery arm conventional leather qlove starting hand K&B 40 Fast Rat has special non-slip prop hub used fliers overcome tendency standard hub loosen engine over heating during flight Dave Katzmeyer p its K&B-powered Fast Ralph Biddle uses bullhorn Rac-Rat refuels flips prop assistant pit ing circles 84 Nats Don JehIlk Rman has hot-gloveone lead plane s Racing Director Bullhorn needed formetal pan other blind-nut wing officials heard over engine noiseTE glow plug lead attached projects rest Scale model ing world Send ideas photos Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Racing/Ballard Continued page 70 sealed containers supplied Racing events Propeller reevaluation subsequent changes mandatory 10% fuel rule great deal hand-molded meticulously-prepared propellers became obsolete especially evident both Scale Racing Rat Racing think safe say Scale Racing peo pie running between 60% 70% nitro drop 10% heavily-pitched propellers range 7 x 5 7 x 5A pitch found totally unsatisfactory loss range 3000 rpms going 70% nitro 10% nitro using 5 5% pitch must remember majority fiberglass carbon fiber propellers originally virtually completed prod ucts required pitch extreme thinness propeller blade allowing very little area left repitch blade found Scale Racers needed completely new propeller design much lower pitch fiberglass car bon fiber copy Taipan 7 x 5 found have enough blade area allow changing pitch approximately 7 x 4-to-4A pitch considerable amount time saved utilizing testing both FAL Combat competitors well RC Quarter Midget racers Both groups have spent con siderable amount time testing propel lers achieve maximum rpm RC Quarter Midget has fuel restrictions some time few competitors have purchased some very lowpitched Free Flight props 7 x 3 A-to-4 pitch range careful workup engine testing resulted some dramatically improved rpm airspeeds reduction airspeed rpm 40 Rat engine quite dramatic Scale Racing certainly re quired complete propeller evaluation past 55% 65% nitro used 7% 8-inch-pitch propellers allow engine unload air found immediately 10% nitro engine would unload satisfactorily airspeed down considerably Fortunately fiberglass Rat Race pro pellers available racers have enough blade area allow de-pitching 6% 7% pitch immediately found OS 40 Pylon engine capable pulling 7%-pitch propeller whereas K&B 40 ST 40 required slightly less pitchabout / % blade diameter approximately eight inches found U •uummuEEEEEEEU-E--U-U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U U K U U U U U. .EEEEE SIG CHAMPION FUEL FREE SHIPPING ON ORDERS OVER $1000 % NITRO 0% PAl 5% 10% 15% 25% 35% 10% 15% PINT $295 $350 $395 $415 $475 $550 $395 $415 QUARTGALLON $425$ 995 $495 $1195 $525 $1395 $595 $1595 $695 $1995 $795 $2395 NEW SIG 4-STROKE FUE $525$1350 $595$1550 L FREIGHT COLLECT 55 GAL DRUM $17500 $24500 $31000 $37400 $50000 $64000 $29500 $35900 U I U U U I THE CHOICE OF CHAMPION FLYERS Dont misled price alone model fuels same Some cut-rate mail order fuel Out selling 10% fuel really contains about 8% nitro skimp costly nitro form g fuel weight basis rather traditional percent-of-volume method Also some ma 0 der fuels blended little 15% total oil Thats OKif geta perfect needle setting everytime otherwise lean run can easily ruin engine Cuts quality like make easy blend com petitively priced fuel really getting quality want over 20 years SIG has blending fuel finest quality ingredients available alcoho 5 995% pure very best grade available nitro use 100% pure get honest port based % volume maximum lubrication get perfect 50150 blend Bakers AA Castor Oil Klotz Techniplate Racing Oil protect expensive engines finest quality fuel m can made price Dont take word try some judge yourself U See dealer first available order direct Call K 800-247-5008 toll free orders Catalog 47 $3 00 SIG MANUFACTURING CO Montezuma IA 50i7l Prices subject te change wrthOet netice EEEuEEuEEuEUEEEEE satisfactory addition smallblade-area propellers seemed develop highest airspeed Field safety Since speed both Slow Rat Rat racers 120-140 tense field safety paramount Midwest area racing competitors have purchased own battery-operated bullhorn use starting judge addition competitors have found ingenious ways protect arms heavy starting batteries also fingers well-filed fiberglass carbon fiber propellers Lately have seen some rather ingenious holders batteries made archery arm supports U U U I I I I I I I U U also finger protectors made archery finger protectors Several competitors have using wellpadded glove thumb third fourth fingers cut off allowing free move ment hand first second fingers left glove allows easier movement should plug change prop relocation wrench necessary Obviously clearly-visible circle mark ings mandatory allow pilot reference point pit man area can safely catch model dur ing pit stops refuel take off being endangered other aircraft land ing taking off material circle/ October 1985 159 /N 201 SE 12th Street Pompano Beach FL 33080 306-7857978 ENGINEERING THE LANDING GEAR PEOPLE lint @1 kil Imodlog gears dont Ill foor kiggle properly o & ii Engihoonog can solve prublenis * Coals hoill needs & specs yuarsoleod hI * Strong & dorohle wilhsland lho loighuel aiding * 0 & 0 Engineeriog gear will work & koep tour kiggie Ily log * In stock roplacoeoel gear br 051 popolar models Byron Pith Christen Eagle CAP 21 Balsa USA J-3 CUB Air Tech Pawns aed Eagle gsa Big Slick Ckawp Citakna R & B models Snapper Stiogor Snapper Ton Once have tried best wont settle anything Kin-Craft quality products N I1IIII4AETWG 4 411flabby fydarb Look complete line Isv ho hbv shop send catalogue marking have found quite satisfac tory strips /4-inch drywall material drywall plasterboard called area usually sandwiched between two pieces paper Y-inch plasterboard makes excellent tool marking circle pavement usually cut off about five-foot section six inches wide use mark off circle using like piece chalk go back put additional lines markings quite durable during day first rain following con test will remove majority asphalt concrete area important school shopping center parking lots utilized contest sites As always comments welcomed John C Ballard 10102 Kimblewick Dr Louisville KY 40223 CL Speed/Hempel Continued page 71 should wish change perhaps suggestion would welcome As myself would suggest change think elimination pipe monoline would direc tion making attractive old-timers still around may still have interest rekindled came out thought Proto Speed much commend about Proto Speed class Dbut difference addition wing area rule cross section rule generous size perhaps add 3A 6-in landing gear decent-size wheels save ex pensive propellers make easier oldsters actually fly models imagine reflexes re quired 200 mph model make essen tially young mans game other words attract ing young perhaps might worth try attract some old stersjust get people out try out neednt have go whole hog create new class rather perhaps sponsor could found donate some suitable prizes given next Nationals fastest plane conformed informal rules other words prize itself would provide rules planes could timed just other class D model Na tionals Well enough thoughts certainly enjoy col umn Model Aviation Maybe Ill have happier outloook after 85 Nats over Well see Look next Speed column sometime after annual Nats issue MA Gene Hempel 301 N Yale Dr Garland TX 75042 given special assistance prevent unscheduled maneuvers Several mem bers Byron staff continually available coordinate safe flight condi tions overall theme event have fun share exhibition ducted-fan flight Engine run-ups preflight procedures began immediately after pilots meeting 900 am could sense eagerness pilots came afar fly fan-jet models Steve Ort East Peoria IL first become airborne Byron F- 16 model powered Rossi 81 Byrojet fan unit good flight marred minor landing gear problems Steve soon joined others sky full fan-jets unique whining sound pace continued throughout day wide variety ducted-fan models taking skies public address system provided valuable information mod els aloft served hold spectator terest As added incentive reg istered pilot completed first flight received award Byrojet fan unit Saturdays weather fair windy some strong gusts up 25 mph wind direction posed problem since directly perpendicular fixed UPERSALE ngspan 60I72 Flight Weight 5-6 lbs * Removable tail section WEEDHOPPER 60 reg price 114 40 reg price 89 SALE 59 * Easy build * Easy fly * Strong yet light * Stable yet agile * Real aircraft hardware end fabric * Fabric pre-aewn fuel proof * Hardwood pre-drilled y assembly * 3 channels 4 optlonall * Super complete kit lies engine radio tanki right down wheel collars UNSURPASSED DURABILITY R & D ENGINEERING 1245 N Evereff Ridgecrest CA 93555 377-4782 160 Model Aviation Jet Rally/Arro Continued page 81 Blue Orange ow e Camouflage Free shipping US COD add $200 CA residents add 6%