C SPORT AEROBATICS Ron Van Putte SHORT WHILE ago received depressing letter often too close truth want share because dont think writers situation uncommon However since writer might appreciate having name print wont identify him writes Just few thoughts Agony Defeat First false propaganda RC busi ness calls hobby people walks life true because average man family cant afford Second products manufacturers claim have easy starting reliable engines $55 engine easy start wasnt reliable would take halfhour three oz fuel just start it ran ran about two minutes sticks would run out fuel someone would have dead stick radio manufacturers also claim have reliable products good service also found opposite Last summer got erratic before month old sent gone two months before got back much good service Iowa summers short enough Third people so-called club instructors dont seem really interested helping newcomer unless join club right away did make jokes about cheap equipment called Sure would take up let play until ran out fuel would dead stick really didnt teach sort takeoff landing procedures also asked couple ofthem go out alone really work too busy bother dont think $500 invested trainer plane can called cheap equipment anybodys book think $500 ought buy maybe 30 minutes sticks two years trying notion takes thousands bucks years just get socalled inexpensive trainer planes up down piece definitely sport average man dont know about letter bothered very much have suffered hands manufacturers lousy products fellow RC fliers too selfish courteous stranger can understand manufacturer putting out bad product claims good because hes money However cant explain some RC fliers unwilling friendly helpful flying site visitors novice fliers need hand Ive gotten several letters readers responded favorably October 1980 column regarding desire see what big bdys improve flying Consequently Ill attempt get several Master class fliers like Dave Brown Steve Helms Don Lowe Mark Radeliff Dean Koger etc names RC household words contribute short pieces subject Hopefully will able begin feature next month run month two until run out Master fliers 28 Model Aviation Mark Niebaum 1 Syears old has flying RC foronlyoneyear competes Novice Pattern beautiful Phoenix 8it has piped Supertigre X-60 Rhom retracts Mark makes home Poca WV ts some good coaching dad John Embry AMA District VIII vicepresident during first Pattern competition Coonass Nationals Lafayette LA Dave Arline used good looking Dirty Birdy compete Southern New Hampshire RC Club 18O Championships Power piped HR 61 PDP Dave resides Leominster MA willing cooperate hope Santa good year brought some RC goodies Christmas present myself cut down some other activities can devote time building new airplanes Before flying season starts up next spring hope finish new Phoenix 8 Balsa USA Phaeton 40powered sport airplane called Tiger using fiberglass fuselage Ive around shop about 10 years Update Kraft RC motorcycle Now time pick up about 50% off retail cost big boom Eleck Rider never happened making false prophets out lot peopleincluding As result being unloaded substantially reduced prices bought first available back around Thanksgiving last year after hard years driving about 50 people varying degrees proficiency cycle fine shape replace pinion gear once because ran sand vibration made couple nuts come loose tightened aside needing new plastic fairing set mines good new still runs like scalded cat attracts spectators like local yokels automobile wreck consistent reponse perennial question does stay up smile say Just fine Ask someone owns give test drive youll excited about am Doug Dahlke calls himself Oshkosh Kidwrote another letter about propellers after read November column letter con tained some items people will find interesting edited version letter Since last letter subject props/engines going speed supposed continued check additional sources found some interesting stuff think thing prop makers measure pitch same way Oh thanks Doug really ft needed yet another can-of-wonns R VP Yup good buddy three different ways prop makers can measure pitch understanding flat face reference used because convenient zero lift line could used because would accurate full-scale aircraft Continued page 108 3Zdd-j 72 Wingspan QUADRA powered DRUINE TURBULENT Gross weight under 20 lbs No foam 1230 sq Simple construction fully detailed Proven design stable aerobatic Shock-absorbing landing gear takes abuse Full-size plans instructions photos best market530 p-p USA DOUG MAC BRIEN 24 Trulay St Granhy Mass a1033 Send SASE mare info lie ata again Rusorlas nanno r-ruuner won prestigious International Tournament Champions forthe 6th consecutivetime invItational meetwas flown October3oNovember 2 Las Vegas NV Circus Circus Hotel/Casino put up $75000 prize money Hanno flew same twin-Webra-powered original-design Dalotel used last year Hans Preetner R Hannos father joinathe champion photo Trophy replica $20000 first-prize check foreground lHWSIUN UALANCI m ALL Ult1COION Heres equipment need give props very best balance--balance directions Carefully crafted top grade materials BUBBLE BALANCER accomodates 3/161/49/32 prop holes Other sizes available special order Dealers invited $1495 Add $150 HOWARD B HUERL DEPT 005 postage hardliog ki Mino add 4% sales tan No CODs BetS 193 Route 4 Maskoto Mn 56001 CUSTOM TUNED ENGINESGET ORGANIZED WA TCB FOR COMPETITION CCESSORIES Here s set 4 study ties holds Os. Special GY 014 X 60 solid lines $295 ppd 4 years yoo taoorie 5 azrses MRGUSI Custom needle valves racing wheels 4 MAG FILES $495 Quick fills fuel shut-offs 8 others lBS pbs 51 50 postage wsd handieg detailed brochure send 25 cents to wwgms Kustom Kraftsmanshlp Box 2699 Laguna Hills P0 BOX 388-K CalIf 92653 Ph 714 830-5162DOVER NH 03620 amount detail first instructionThe Sigkit shows optional non-scale enlarge- summary Wendells plans well drawn manual Since majority persons purchas-ment ailerons rolland contain sufficient detail rank ing plans experienced really unnecessaryperformance never outstanding Wendellbeginner Both designs have suc go great detail However some clarifica-opted go four ailerons increase perform-cessfully flown have seen Wendell fly tion explanations may helpfulance servos drive lower wing unitsLiberty Sport smooth realistic the time written would havewith coupling struts upper wing aileronsair can certainly recommend Im agreed Im getting more questionsUnless Scale purist added flightawfully tempted Jungmeister people relative newcomers toagility far outweighs slightly non-scale appear-the time Both plans listed $2150 modeling same time newcomers willancenotes inflation may have changed usually build two kits before taking construction both planes follows usualWrite Wendell Hostetler 1041 Heatherwood step toplan building Wendells plans instruc-modeling practice some material substitu-Lane Orrville OH 44667 tions adequate anyone except absolutetions Basswood specified areas tyrois nice material work readily Bob Beckman 8248 Holly Grove Court two plans very similar waysavailable especially longer lengths SpruceManassas VA 22110 703 369-2432 comments will apply both Theycould substituted desired consist two sheets 42-in X 82-in lot balsa called out As have saidR C Aerobatics/Van Putte instruction manual manuals containbefore substitutes balsa canContinued page 29 some interesting useful information en-really cut down cost big birds gines servos flying etc addition construc-meant criticism plans sugges-chord line commonly usedand tion details particularly useful item istions want try some newdont know could 17% difference relatively complete bill materialsmethods Foam-core board available artistsin pitch flat-faced pitch say 8-in Anyone has built Sig Liberty Sportsupply stores makes beautiful wing ribs andcompared 8-in zero-lift-hue pitch Question will have feeling deja vu working withfuselage formers think could replace thewhat pitch reference does Top Flite use Zinger plans However addition expectedfull-length 3/16-in sheet balsa fuselage sidesMaster Airscrew Etc Does anyone know changes materials sizes twoThe cost difference would significant BalsaWorse yet according Bill Cassidy prop significant differences Wendell uses simpleblocks used filling shaping can often bemaker Colorado another problem effective method making tail surfacesreplaced rigid insulation foam Just keep inactual performance prop vs pitch removable can aid transportationmind foam cant take dope littlestamped hub pitch distri problem other change ailerons theHobbypoxy No 2 glue brushed onto exposedbution used manufacturer Tests have full-scale airplane has lower wing ailerons onlyfoam surface does trickshown greater efficiency attained tip FUN SCALE IS HERE Easier Fly Yet Very Maneuverable Over 20 step-by-step budding illustrations COBRA easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice 19-25 Engine 4695 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq unique 0 oz wing loadingCan Built Flown 7 Dayswrite free Catalog ellusinates dihedral hraces3Y4-4 lbsDue New Construction Techniques JEMCO wing heeling Upright Engine 1305 Foothill Dr Vista CA 92083 Deslgaed Iron-on coveringsWILL FLY AS SLOW AS PIPER CUB MODEL714 724-3242 108 Model Aviation MASTER AIRSCREW PRESENTS BALSA STRIPPER 495 AT YOUR DEALER PRECISION STRIP WOOD TO x INS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOL T PRICE WINDSOR PROPELLER CO PO BOX 112 WINDSOR CA 95492 propeller pitched up slightly 10 1 0 above established pitch center section should pitched down slightly station prop actually correct 75% station pitch measured other stations little above little below geometric pitch net effect slightly increase average pitch prop manufacturer must experiment pitch distribution stick props designs will know prop will perform Efficiency constantly changing rpm Model props turn such high rpm have efficiencies 40% 50% am still confused two components prop thrust think thrust generated both upper face prop approximately what percentage thrust con tributed eachand what speeds want thank time effort put column reply Dont know what want letter Ive got good idea would appreciate comments would care make comments column will short due lack space next month Ill talk about percentage thrust generated two sides prop Basically agree everything Bill Cassidy alleged have said alluded differences way prop manufacturers made products April 1980 column As far what want complex controversial letters can see what did Others like same other subjects welcome encour aged general interest Ill see get printed Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 FF Old-Timers/Haught Continued page 54 like use nearly full-strength adhering covering Acrylic lacquer thinner obtainable automotive supply house works well either nitrate butyrate dope Acrylic lacquer thinner comes three grades cleanup thinner works fine cheap does produce high gloss does soften previous coats great degree light-penetration thinner does soften some high gloss thinner has deep penetration Various brand names available have basic grades Butyrate dope may applied over nitrate dope vice versa Some builders begin finish nitrate complete epoxy paints either clear pigmented personally like keep finishes pure throughout easier patch repair basic dope finishes Initial coats dope should brushed ensure good bond Later coats may sprayed good ventilation available Brushing first coat fabric particularly silk can problem dope tends brushed through cloth runs down inside creating blisters fabric problem can virtually eliminated applying dope fo new foam brushes Just dip brush dope drag across fabric lays film dope surface will soak enough good bond creating blister effect Dont go over wet areasjust overlap slightly pass brush About five coats dope should provide serviceable finish depend ing course much dope thinned like bring up light gloss stop Less 77Dave Dlatt iviodels Inc Air cylinder 5/8 bore New design Y-LOCK provides positive lock UP asd DOWN Mt super-tough Only 1 3/8 high fits airfoilCAPRON Low profile asd overall compact size Retraction angle t5 9O --specify ordering Lz fl7 DEVELOP Massive legs--i /2 diameter alloy 1* spring shock-absorbing bottom end L included REFINE EXPAND Experience RLG System customers ourselves over past 2 years has resulted numerous mechanical revisions improvements have incorporated fanfare significant result has highly refined retract system large models io 30 lbs Besides being used own 1/5 scale kits recommended Bud Nosen P-Si P47 Vito Fomeo big Sea Fury several others versatility system has expanded several ways have choice 850 900 retraction angle choice leg-under-cylinder leg-away-from-cylin der offer free leaflet describing simple modification up-and-twist Corsair style operation another showing noseleg modification Different coils available unique oleo shock-legs handle various weights model instructions now include details tail wheel hookup Sure Piper Cubs nice youre thinking about large-scale model retract-gear ship Dave Platt RLG System has made designs possibleSystem Price $12900 Outfit Includes 2 main units shock-legs air tank switcher pressure indicator tubing etc booklet Optional extras -- pump speed reducers extra air tanks Dave Platt products available dtrectlt/ manufacturer ONLY Send check Money Order Visa MasterCard number C 0 D orders also accepted /97DlattVISA j6951 Northwest 15th Avenue oaveEvuodels Fort Lauderdale Florida 33309 call 305/587-4861 evenings AIRO Meets SAM RC Antique & Old Timer events School Yard trainer mu —VVviijDELIts size weight make secellent chotne ton mire parts formed shape II Contains complete hardware package including miniB 8~yv R D G IiI E adisotable puohrod connectors screws blind nets Balsa wheel kit 4 wheel halves plastrc bearings washers wheel retainers pro-fabrication material selection otthe Mike surpasses Tyro Playboy Senior sPEcIFIcATIONS mnt5vanaO5 OveAii Lengthn mint chora70 Mn Sen wgt75 inns Aea sq Snorne sun -os PLAYBOY SENIOR Still Available $49 95 plus 3 00 freight tr handling Price S2895 Hobby Dealer ordering direcn please add $250 freight handling & insurance California residents add 6% Salon Tax Manufactured Tyro Models Designed no Flyll 1930 EDGEWOOD DR. PO BOX 11511 PALO ALTO CA 94306 415 856-7781 uary 1981 109
Edition: Model Aviation - 1981/02
Page Numbers: 28, 29, 108, 109
C SPORT AEROBATICS Ron Van Putte SHORT WHILE ago received depressing letter often too close truth want share because dont think writers situation uncommon However since writer might appreciate having name print wont identify him writes Just few thoughts Agony Defeat First false propaganda RC busi ness calls hobby people walks life true because average man family cant afford Second products manufacturers claim have easy starting reliable engines $55 engine easy start wasnt reliable would take halfhour three oz fuel just start it ran ran about two minutes sticks would run out fuel someone would have dead stick radio manufacturers also claim have reliable products good service also found opposite Last summer got erratic before month old sent gone two months before got back much good service Iowa summers short enough Third people so-called club instructors dont seem really interested helping newcomer unless join club right away did make jokes about cheap equipment called Sure would take up let play until ran out fuel would dead stick really didnt teach sort takeoff landing procedures also asked couple ofthem go out alone really work too busy bother dont think $500 invested trainer plane can called cheap equipment anybodys book think $500 ought buy maybe 30 minutes sticks two years trying notion takes thousands bucks years just get socalled inexpensive trainer planes up down piece definitely sport average man dont know about letter bothered very much have suffered hands manufacturers lousy products fellow RC fliers too selfish courteous stranger can understand manufacturer putting out bad product claims good because hes money However cant explain some RC fliers unwilling friendly helpful flying site visitors novice fliers need hand Ive gotten several letters readers responded favorably October 1980 column regarding desire see what big bdys improve flying Consequently Ill attempt get several Master class fliers like Dave Brown Steve Helms Don Lowe Mark Radeliff Dean Koger etc names RC household words contribute short pieces subject Hopefully will able begin feature next month run month two until run out Master fliers 28 Model Aviation Mark Niebaum 1 Syears old has flying RC foronlyoneyear competes Novice Pattern beautiful Phoenix 8it has piped Supertigre X-60 Rhom retracts Mark makes home Poca WV ts some good coaching dad John Embry AMA District VIII vicepresident during first Pattern competition Coonass Nationals Lafayette LA Dave Arline used good looking Dirty Birdy compete Southern New Hampshire RC Club 18O Championships Power piped HR 61 PDP Dave resides Leominster MA willing cooperate hope Santa good year brought some RC goodies Christmas present myself cut down some other activities can devote time building new airplanes Before flying season starts up next spring hope finish new Phoenix 8 Balsa USA Phaeton 40powered sport airplane called Tiger using fiberglass fuselage Ive around shop about 10 years Update Kraft RC motorcycle Now time pick up about 50% off retail cost big boom Eleck Rider never happened making false prophets out lot peopleincluding As result being unloaded substantially reduced prices bought first available back around Thanksgiving last year after hard years driving about 50 people varying degrees proficiency cycle fine shape replace pinion gear once because ran sand vibration made couple nuts come loose tightened aside needing new plastic fairing set mines good new still runs like scalded cat attracts spectators like local yokels automobile wreck consistent reponse perennial question does stay up smile say Just fine Ask someone owns give test drive youll excited about am Doug Dahlke calls himself Oshkosh Kidwrote another letter about propellers after read November column letter con tained some items people will find interesting edited version letter Since last letter subject props/engines going speed supposed continued check additional sources found some interesting stuff think thing prop makers measure pitch same way Oh thanks Doug really ft needed yet another can-of-wonns R VP Yup good buddy three different ways prop makers can measure pitch understanding flat face reference used because convenient zero lift line could used because would accurate full-scale aircraft Continued page 108 3Zdd-j 72 Wingspan QUADRA powered DRUINE TURBULENT Gross weight under 20 lbs No foam 1230 sq Simple construction fully detailed Proven design stable aerobatic Shock-absorbing landing gear takes abuse Full-size plans instructions photos best market530 p-p USA DOUG MAC BRIEN 24 Trulay St Granhy Mass a1033 Send SASE mare info lie ata again Rusorlas nanno r-ruuner won prestigious International Tournament Champions forthe 6th consecutivetime invItational meetwas flown October3oNovember 2 Las Vegas NV Circus Circus Hotel/Casino put up $75000 prize money Hanno flew same twin-Webra-powered original-design Dalotel used last year Hans Preetner R Hannos father joinathe champion photo Trophy replica $20000 first-prize check foreground lHWSIUN UALANCI m ALL Ult1COION Heres equipment need give props very best balance--balance directions Carefully crafted top grade materials BUBBLE BALANCER accomodates 3/161/49/32 prop holes Other sizes available special order Dealers invited $1495 Add $150 HOWARD B HUERL DEPT 005 postage hardliog ki Mino add 4% sales tan No CODs BetS 193 Route 4 Maskoto Mn 56001 CUSTOM TUNED ENGINESGET ORGANIZED WA TCB FOR COMPETITION CCESSORIES Here s set 4 study ties holds Os. Special GY 014 X 60 solid lines $295 ppd 4 years yoo taoorie 5 azrses MRGUSI Custom needle valves racing wheels 4 MAG FILES $495 Quick fills fuel shut-offs 8 others lBS pbs 51 50 postage wsd handieg detailed brochure send 25 cents to wwgms Kustom Kraftsmanshlp Box 2699 Laguna Hills P0 BOX 388-K CalIf 92653 Ph 714 830-5162DOVER NH 03620 amount detail first instructionThe Sigkit shows optional non-scale enlarge- summary Wendells plans well drawn manual Since majority persons purchas-ment ailerons rolland contain sufficient detail rank ing plans experienced really unnecessaryperformance never outstanding Wendellbeginner Both designs have suc go great detail However some clarifica-opted go four ailerons increase perform-cessfully flown have seen Wendell fly tion explanations may helpfulance servos drive lower wing unitsLiberty Sport smooth realistic the time written would havewith coupling struts upper wing aileronsair can certainly recommend Im agreed Im getting more questionsUnless Scale purist added flightawfully tempted Jungmeister people relative newcomers toagility far outweighs slightly non-scale appear-the time Both plans listed $2150 modeling same time newcomers willancenotes inflation may have changed usually build two kits before taking construction both planes follows usualWrite Wendell Hostetler 1041 Heatherwood step toplan building Wendells plans instruc-modeling practice some material substitu-Lane Orrville OH 44667 tions adequate anyone except absolutetions Basswood specified areas tyrois nice material work readily Bob Beckman 8248 Holly Grove Court two plans very similar waysavailable especially longer lengths SpruceManassas VA 22110 703 369-2432 comments will apply both Theycould substituted desired consist two sheets 42-in X 82-in lot balsa called out As have saidR C Aerobatics/Van Putte instruction manual manuals containbefore substitutes balsa canContinued page 29 some interesting useful information en-really cut down cost big birds gines servos flying etc addition construc-meant criticism plans sugges-chord line commonly usedand tion details particularly useful item istions want try some newdont know could 17% difference relatively complete bill materialsmethods Foam-core board available artistsin pitch flat-faced pitch say 8-in Anyone has built Sig Liberty Sportsupply stores makes beautiful wing ribs andcompared 8-in zero-lift-hue pitch Question will have feeling deja vu working withfuselage formers think could replace thewhat pitch reference does Top Flite use Zinger plans However addition expectedfull-length 3/16-in sheet balsa fuselage sidesMaster Airscrew Etc Does anyone know changes materials sizes twoThe cost difference would significant BalsaWorse yet according Bill Cassidy prop significant differences Wendell uses simpleblocks used filling shaping can often bemaker Colorado another problem effective method making tail surfacesreplaced rigid insulation foam Just keep inactual performance prop vs pitch removable can aid transportationmind foam cant take dope littlestamped hub pitch distri problem other change ailerons theHobbypoxy No 2 glue brushed onto exposedbution used manufacturer Tests have full-scale airplane has lower wing ailerons onlyfoam surface does trickshown greater efficiency attained tip FUN SCALE IS HERE Easier Fly Yet Very Maneuverable Over 20 step-by-step budding illustrations COBRA easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice 19-25 Engine 4695 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq unique 0 oz wing loadingCan Built Flown 7 Dayswrite free Catalog ellusinates dihedral hraces3Y4-4 lbsDue New Construction Techniques JEMCO wing heeling Upright Engine 1305 Foothill Dr Vista CA 92083 Deslgaed Iron-on coveringsWILL FLY AS SLOW AS PIPER CUB MODEL714 724-3242 108 Model Aviation MASTER AIRSCREW PRESENTS BALSA STRIPPER 495 AT YOUR DEALER PRECISION STRIP WOOD TO x INS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOL T PRICE WINDSOR PROPELLER CO PO BOX 112 WINDSOR CA 95492 propeller pitched up slightly 10 1 0 above established pitch center section should pitched down slightly station prop actually correct 75% station pitch measured other stations little above little below geometric pitch net effect slightly increase average pitch prop manufacturer must experiment pitch distribution stick props designs will know prop will perform Efficiency constantly changing rpm Model props turn such high rpm have efficiencies 40% 50% am still confused two components prop thrust think thrust generated both upper face prop approximately what percentage thrust con tributed eachand what speeds want thank time effort put column reply Dont know what want letter Ive got good idea would appreciate comments would care make comments column will short due lack space next month Ill talk about percentage thrust generated two sides prop Basically agree everything Bill Cassidy alleged have said alluded differences way prop manufacturers made products April 1980 column As far what want complex controversial letters can see what did Others like same other subjects welcome encour aged general interest Ill see get printed Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 FF Old-Timers/Haught Continued page 54 like use nearly full-strength adhering covering Acrylic lacquer thinner obtainable automotive supply house works well either nitrate butyrate dope Acrylic lacquer thinner comes three grades cleanup thinner works fine cheap does produce high gloss does soften previous coats great degree light-penetration thinner does soften some high gloss thinner has deep penetration Various brand names available have basic grades Butyrate dope may applied over nitrate dope vice versa Some builders begin finish nitrate complete epoxy paints either clear pigmented personally like keep finishes pure throughout easier patch repair basic dope finishes Initial coats dope should brushed ensure good bond Later coats may sprayed good ventilation available Brushing first coat fabric particularly silk can problem dope tends brushed through cloth runs down inside creating blisters fabric problem can virtually eliminated applying dope fo new foam brushes Just dip brush dope drag across fabric lays film dope surface will soak enough good bond creating blister effect Dont go over wet areasjust overlap slightly pass brush About five coats dope should provide serviceable finish depend ing course much dope thinned like bring up light gloss stop Less 77Dave Dlatt iviodels Inc Air cylinder 5/8 bore New design Y-LOCK provides positive lock UP asd DOWN Mt super-tough Only 1 3/8 high fits airfoilCAPRON Low profile asd overall compact size Retraction angle t5 9O --specify ordering Lz fl7 DEVELOP Massive legs--i /2 diameter alloy 1* spring shock-absorbing bottom end L included REFINE EXPAND Experience RLG System customers ourselves over past 2 years has resulted numerous mechanical revisions improvements have incorporated fanfare significant result has highly refined retract system large models io 30 lbs Besides being used own 1/5 scale kits recommended Bud Nosen P-Si P47 Vito Fomeo big Sea Fury several others versatility system has expanded several ways have choice 850 900 retraction angle choice leg-under-cylinder leg-away-from-cylin der offer free leaflet describing simple modification up-and-twist Corsair style operation another showing noseleg modification Different coils available unique oleo shock-legs handle various weights model instructions now include details tail wheel hookup Sure Piper Cubs nice youre thinking about large-scale model retract-gear ship Dave Platt RLG System has made designs possibleSystem Price $12900 Outfit Includes 2 main units shock-legs air tank switcher pressure indicator tubing etc booklet Optional extras -- pump speed reducers extra air tanks Dave Platt products available dtrectlt/ manufacturer ONLY Send check Money Order Visa MasterCard number C 0 D orders also accepted /97DlattVISA j6951 Northwest 15th Avenue oaveEvuodels Fort Lauderdale Florida 33309 call 305/587-4861 evenings AIRO Meets SAM RC Antique & Old Timer events School Yard trainer mu —VVviijDELIts size weight make secellent chotne ton mire parts formed shape II Contains complete hardware package including miniB 8~yv R D G IiI E adisotable puohrod connectors screws blind nets Balsa wheel kit 4 wheel halves plastrc bearings washers wheel retainers pro-fabrication material selection otthe Mike surpasses Tyro Playboy Senior sPEcIFIcATIONS mnt5vanaO5 OveAii Lengthn mint chora70 Mn Sen wgt75 inns Aea sq Snorne sun -os PLAYBOY SENIOR Still Available $49 95 plus 3 00 freight tr handling Price S2895 Hobby Dealer ordering direcn please add $250 freight handling & insurance California residents add 6% Salon Tax Manufactured Tyro Models Designed no Flyll 1930 EDGEWOOD DR. PO BOX 11511 PALO ALTO CA 94306 415 856-7781 uary 1981 109
Edition: Model Aviation - 1981/02
Page Numbers: 28, 29, 108, 109
C SPORT AEROBATICS Ron Van Putte SHORT WHILE ago received depressing letter often too close truth want share because dont think writers situation uncommon However since writer might appreciate having name print wont identify him writes Just few thoughts Agony Defeat First false propaganda RC busi ness calls hobby people walks life true because average man family cant afford Second products manufacturers claim have easy starting reliable engines $55 engine easy start wasnt reliable would take halfhour three oz fuel just start it ran ran about two minutes sticks would run out fuel someone would have dead stick radio manufacturers also claim have reliable products good service also found opposite Last summer got erratic before month old sent gone two months before got back much good service Iowa summers short enough Third people so-called club instructors dont seem really interested helping newcomer unless join club right away did make jokes about cheap equipment called Sure would take up let play until ran out fuel would dead stick really didnt teach sort takeoff landing procedures also asked couple ofthem go out alone really work too busy bother dont think $500 invested trainer plane can called cheap equipment anybodys book think $500 ought buy maybe 30 minutes sticks two years trying notion takes thousands bucks years just get socalled inexpensive trainer planes up down piece definitely sport average man dont know about letter bothered very much have suffered hands manufacturers lousy products fellow RC fliers too selfish courteous stranger can understand manufacturer putting out bad product claims good because hes money However cant explain some RC fliers unwilling friendly helpful flying site visitors novice fliers need hand Ive gotten several letters readers responded favorably October 1980 column regarding desire see what big bdys improve flying Consequently Ill attempt get several Master class fliers like Dave Brown Steve Helms Don Lowe Mark Radeliff Dean Koger etc names RC household words contribute short pieces subject Hopefully will able begin feature next month run month two until run out Master fliers 28 Model Aviation Mark Niebaum 1 Syears old has flying RC foronlyoneyear competes Novice Pattern beautiful Phoenix 8it has piped Supertigre X-60 Rhom retracts Mark makes home Poca WV ts some good coaching dad John Embry AMA District VIII vicepresident during first Pattern competition Coonass Nationals Lafayette LA Dave Arline used good looking Dirty Birdy compete Southern New Hampshire RC Club 18O Championships Power piped HR 61 PDP Dave resides Leominster MA willing cooperate hope Santa good year brought some RC goodies Christmas present myself cut down some other activities can devote time building new airplanes Before flying season starts up next spring hope finish new Phoenix 8 Balsa USA Phaeton 40powered sport airplane called Tiger using fiberglass fuselage Ive around shop about 10 years Update Kraft RC motorcycle Now time pick up about 50% off retail cost big boom Eleck Rider never happened making false prophets out lot peopleincluding As result being unloaded substantially reduced prices bought first available back around Thanksgiving last year after hard years driving about 50 people varying degrees proficiency cycle fine shape replace pinion gear once because ran sand vibration made couple nuts come loose tightened aside needing new plastic fairing set mines good new still runs like scalded cat attracts spectators like local yokels automobile wreck consistent reponse perennial question does stay up smile say Just fine Ask someone owns give test drive youll excited about am Doug Dahlke calls himself Oshkosh Kidwrote another letter about propellers after read November column letter con tained some items people will find interesting edited version letter Since last letter subject props/engines going speed supposed continued check additional sources found some interesting stuff think thing prop makers measure pitch same way Oh thanks Doug really ft needed yet another can-of-wonns R VP Yup good buddy three different ways prop makers can measure pitch understanding flat face reference used because convenient zero lift line could used because would accurate full-scale aircraft Continued page 108 3Zdd-j 72 Wingspan QUADRA powered DRUINE TURBULENT Gross weight under 20 lbs No foam 1230 sq Simple construction fully detailed Proven design stable aerobatic Shock-absorbing landing gear takes abuse Full-size plans instructions photos best market530 p-p USA DOUG MAC BRIEN 24 Trulay St Granhy Mass a1033 Send SASE mare info lie ata again Rusorlas nanno r-ruuner won prestigious International Tournament Champions forthe 6th consecutivetime invItational meetwas flown October3oNovember 2 Las Vegas NV Circus Circus Hotel/Casino put up $75000 prize money Hanno flew same twin-Webra-powered original-design Dalotel used last year Hans Preetner R Hannos father joinathe champion photo Trophy replica $20000 first-prize check foreground lHWSIUN UALANCI m ALL Ult1COION Heres equipment need give props very best balance--balance directions Carefully crafted top grade materials BUBBLE BALANCER accomodates 3/161/49/32 prop holes Other sizes available special order Dealers invited $1495 Add $150 HOWARD B HUERL DEPT 005 postage hardliog ki Mino add 4% sales tan No CODs BetS 193 Route 4 Maskoto Mn 56001 CUSTOM TUNED ENGINESGET ORGANIZED WA TCB FOR COMPETITION CCESSORIES Here s set 4 study ties holds Os. Special GY 014 X 60 solid lines $295 ppd 4 years yoo taoorie 5 azrses MRGUSI Custom needle valves racing wheels 4 MAG FILES $495 Quick fills fuel shut-offs 8 others lBS pbs 51 50 postage wsd handieg detailed brochure send 25 cents to wwgms Kustom Kraftsmanshlp Box 2699 Laguna Hills P0 BOX 388-K CalIf 92653 Ph 714 830-5162DOVER NH 03620 amount detail first instructionThe Sigkit shows optional non-scale enlarge- summary Wendells plans well drawn manual Since majority persons purchas-ment ailerons rolland contain sufficient detail rank ing plans experienced really unnecessaryperformance never outstanding Wendellbeginner Both designs have suc go great detail However some clarifica-opted go four ailerons increase perform-cessfully flown have seen Wendell fly tion explanations may helpfulance servos drive lower wing unitsLiberty Sport smooth realistic the time written would havewith coupling struts upper wing aileronsair can certainly recommend Im agreed Im getting more questionsUnless Scale purist added flightawfully tempted Jungmeister people relative newcomers toagility far outweighs slightly non-scale appear-the time Both plans listed $2150 modeling same time newcomers willancenotes inflation may have changed usually build two kits before taking construction both planes follows usualWrite Wendell Hostetler 1041 Heatherwood step toplan building Wendells plans instruc-modeling practice some material substitu-Lane Orrville OH 44667 tions adequate anyone except absolutetions Basswood specified areas tyrois nice material work readily Bob Beckman 8248 Holly Grove Court two plans very similar waysavailable especially longer lengths SpruceManassas VA 22110 703 369-2432 comments will apply both Theycould substituted desired consist two sheets 42-in X 82-in lot balsa called out As have saidR C Aerobatics/Van Putte instruction manual manuals containbefore substitutes balsa canContinued page 29 some interesting useful information en-really cut down cost big birds gines servos flying etc addition construc-meant criticism plans sugges-chord line commonly usedand tion details particularly useful item istions want try some newdont know could 17% difference relatively complete bill materialsmethods Foam-core board available artistsin pitch flat-faced pitch say 8-in Anyone has built Sig Liberty Sportsupply stores makes beautiful wing ribs andcompared 8-in zero-lift-hue pitch Question will have feeling deja vu working withfuselage formers think could replace thewhat pitch reference does Top Flite use Zinger plans However addition expectedfull-length 3/16-in sheet balsa fuselage sidesMaster Airscrew Etc Does anyone know changes materials sizes twoThe cost difference would significant BalsaWorse yet according Bill Cassidy prop significant differences Wendell uses simpleblocks used filling shaping can often bemaker Colorado another problem effective method making tail surfacesreplaced rigid insulation foam Just keep inactual performance prop vs pitch removable can aid transportationmind foam cant take dope littlestamped hub pitch distri problem other change ailerons theHobbypoxy No 2 glue brushed onto exposedbution used manufacturer Tests have full-scale airplane has lower wing ailerons onlyfoam surface does trickshown greater efficiency attained tip FUN SCALE IS HERE Easier Fly Yet Very Maneuverable Over 20 step-by-step budding illustrations COBRA easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice 19-25 Engine 4695 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq unique 0 oz wing loadingCan Built Flown 7 Dayswrite free Catalog ellusinates dihedral hraces3Y4-4 lbsDue New Construction Techniques JEMCO wing heeling Upright Engine 1305 Foothill Dr Vista CA 92083 Deslgaed Iron-on coveringsWILL FLY AS SLOW AS PIPER CUB MODEL714 724-3242 108 Model Aviation MASTER AIRSCREW PRESENTS BALSA STRIPPER 495 AT YOUR DEALER PRECISION STRIP WOOD TO x INS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOL T PRICE WINDSOR PROPELLER CO PO BOX 112 WINDSOR CA 95492 propeller pitched up slightly 10 1 0 above established pitch center section should pitched down slightly station prop actually correct 75% station pitch measured other stations little above little below geometric pitch net effect slightly increase average pitch prop manufacturer must experiment pitch distribution stick props designs will know prop will perform Efficiency constantly changing rpm Model props turn such high rpm have efficiencies 40% 50% am still confused two components prop thrust think thrust generated both upper face prop approximately what percentage thrust con tributed eachand what speeds want thank time effort put column reply Dont know what want letter Ive got good idea would appreciate comments would care make comments column will short due lack space next month Ill talk about percentage thrust generated two sides prop Basically agree everything Bill Cassidy alleged have said alluded differences way prop manufacturers made products April 1980 column As far what want complex controversial letters can see what did Others like same other subjects welcome encour aged general interest Ill see get printed Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 FF Old-Timers/Haught Continued page 54 like use nearly full-strength adhering covering Acrylic lacquer thinner obtainable automotive supply house works well either nitrate butyrate dope Acrylic lacquer thinner comes three grades cleanup thinner works fine cheap does produce high gloss does soften previous coats great degree light-penetration thinner does soften some high gloss thinner has deep penetration Various brand names available have basic grades Butyrate dope may applied over nitrate dope vice versa Some builders begin finish nitrate complete epoxy paints either clear pigmented personally like keep finishes pure throughout easier patch repair basic dope finishes Initial coats dope should brushed ensure good bond Later coats may sprayed good ventilation available Brushing first coat fabric particularly silk can problem dope tends brushed through cloth runs down inside creating blisters fabric problem can virtually eliminated applying dope fo new foam brushes Just dip brush dope drag across fabric lays film dope surface will soak enough good bond creating blister effect Dont go over wet areasjust overlap slightly pass brush About five coats dope should provide serviceable finish depend ing course much dope thinned like bring up light gloss stop Less 77Dave Dlatt iviodels Inc Air cylinder 5/8 bore New design Y-LOCK provides positive lock UP asd DOWN Mt super-tough Only 1 3/8 high fits airfoilCAPRON Low profile asd overall compact size Retraction angle t5 9O --specify ordering Lz fl7 DEVELOP Massive legs--i /2 diameter alloy 1* spring shock-absorbing bottom end L included REFINE EXPAND Experience RLG System customers ourselves over past 2 years has resulted numerous mechanical revisions improvements have incorporated fanfare significant result has highly refined retract system large models io 30 lbs Besides being used own 1/5 scale kits recommended Bud Nosen P-Si P47 Vito Fomeo big Sea Fury several others versatility system has expanded several ways have choice 850 900 retraction angle choice leg-under-cylinder leg-away-from-cylin der offer free leaflet describing simple modification up-and-twist Corsair style operation another showing noseleg modification Different coils available unique oleo shock-legs handle various weights model instructions now include details tail wheel hookup Sure Piper Cubs nice youre thinking about large-scale model retract-gear ship Dave Platt RLG System has made designs possibleSystem Price $12900 Outfit Includes 2 main units shock-legs air tank switcher pressure indicator tubing etc booklet Optional extras -- pump speed reducers extra air tanks Dave Platt products available dtrectlt/ manufacturer ONLY Send check Money Order Visa MasterCard number C 0 D orders also accepted /97DlattVISA j6951 Northwest 15th Avenue oaveEvuodels Fort Lauderdale Florida 33309 call 305/587-4861 evenings AIRO Meets SAM RC Antique & Old Timer events School Yard trainer mu —VVviijDELIts size weight make secellent chotne ton mire parts formed shape II Contains complete hardware package including miniB 8~yv R D G IiI E adisotable puohrod connectors screws blind nets Balsa wheel kit 4 wheel halves plastrc bearings washers wheel retainers pro-fabrication material selection otthe Mike surpasses Tyro Playboy Senior sPEcIFIcATIONS mnt5vanaO5 OveAii Lengthn mint chora70 Mn Sen wgt75 inns Aea sq Snorne sun -os PLAYBOY SENIOR Still Available $49 95 plus 3 00 freight tr handling Price S2895 Hobby Dealer ordering direcn please add $250 freight handling & insurance California residents add 6% Salon Tax Manufactured Tyro Models Designed no Flyll 1930 EDGEWOOD DR. PO BOX 11511 PALO ALTO CA 94306 415 856-7781 uary 1981 109
Edition: Model Aviation - 1981/02
Page Numbers: 28, 29, 108, 109
C SPORT AEROBATICS Ron Van Putte SHORT WHILE ago received depressing letter often too close truth want share because dont think writers situation uncommon However since writer might appreciate having name print wont identify him writes Just few thoughts Agony Defeat First false propaganda RC busi ness calls hobby people walks life true because average man family cant afford Second products manufacturers claim have easy starting reliable engines $55 engine easy start wasnt reliable would take halfhour three oz fuel just start it ran ran about two minutes sticks would run out fuel someone would have dead stick radio manufacturers also claim have reliable products good service also found opposite Last summer got erratic before month old sent gone two months before got back much good service Iowa summers short enough Third people so-called club instructors dont seem really interested helping newcomer unless join club right away did make jokes about cheap equipment called Sure would take up let play until ran out fuel would dead stick really didnt teach sort takeoff landing procedures also asked couple ofthem go out alone really work too busy bother dont think $500 invested trainer plane can called cheap equipment anybodys book think $500 ought buy maybe 30 minutes sticks two years trying notion takes thousands bucks years just get socalled inexpensive trainer planes up down piece definitely sport average man dont know about letter bothered very much have suffered hands manufacturers lousy products fellow RC fliers too selfish courteous stranger can understand manufacturer putting out bad product claims good because hes money However cant explain some RC fliers unwilling friendly helpful flying site visitors novice fliers need hand Ive gotten several letters readers responded favorably October 1980 column regarding desire see what big bdys improve flying Consequently Ill attempt get several Master class fliers like Dave Brown Steve Helms Don Lowe Mark Radeliff Dean Koger etc names RC household words contribute short pieces subject Hopefully will able begin feature next month run month two until run out Master fliers 28 Model Aviation Mark Niebaum 1 Syears old has flying RC foronlyoneyear competes Novice Pattern beautiful Phoenix 8it has piped Supertigre X-60 Rhom retracts Mark makes home Poca WV ts some good coaching dad John Embry AMA District VIII vicepresident during first Pattern competition Coonass Nationals Lafayette LA Dave Arline used good looking Dirty Birdy compete Southern New Hampshire RC Club 18O Championships Power piped HR 61 PDP Dave resides Leominster MA willing cooperate hope Santa good year brought some RC goodies Christmas present myself cut down some other activities can devote time building new airplanes Before flying season starts up next spring hope finish new Phoenix 8 Balsa USA Phaeton 40powered sport airplane called Tiger using fiberglass fuselage Ive around shop about 10 years Update Kraft RC motorcycle Now time pick up about 50% off retail cost big boom Eleck Rider never happened making false prophets out lot peopleincluding As result being unloaded substantially reduced prices bought first available back around Thanksgiving last year after hard years driving about 50 people varying degrees proficiency cycle fine shape replace pinion gear once because ran sand vibration made couple nuts come loose tightened aside needing new plastic fairing set mines good new still runs like scalded cat attracts spectators like local yokels automobile wreck consistent reponse perennial question does stay up smile say Just fine Ask someone owns give test drive youll excited about am Doug Dahlke calls himself Oshkosh Kidwrote another letter about propellers after read November column letter con tained some items people will find interesting edited version letter Since last letter subject props/engines going speed supposed continued check additional sources found some interesting stuff think thing prop makers measure pitch same way Oh thanks Doug really ft needed yet another can-of-wonns R VP Yup good buddy three different ways prop makers can measure pitch understanding flat face reference used because convenient zero lift line could used because would accurate full-scale aircraft Continued page 108 3Zdd-j 72 Wingspan QUADRA powered DRUINE TURBULENT Gross weight under 20 lbs No foam 1230 sq Simple construction fully detailed Proven design stable aerobatic Shock-absorbing landing gear takes abuse Full-size plans instructions photos best market530 p-p USA DOUG MAC BRIEN 24 Trulay St Granhy Mass a1033 Send SASE mare info lie ata again Rusorlas nanno r-ruuner won prestigious International Tournament Champions forthe 6th consecutivetime invItational meetwas flown October3oNovember 2 Las Vegas NV Circus Circus Hotel/Casino put up $75000 prize money Hanno flew same twin-Webra-powered original-design Dalotel used last year Hans Preetner R Hannos father joinathe champion photo Trophy replica $20000 first-prize check foreground lHWSIUN UALANCI m ALL Ult1COION Heres equipment need give props very best balance--balance directions Carefully crafted top grade materials BUBBLE BALANCER accomodates 3/161/49/32 prop holes Other sizes available special order Dealers invited $1495 Add $150 HOWARD B HUERL DEPT 005 postage hardliog ki Mino add 4% sales tan No CODs BetS 193 Route 4 Maskoto Mn 56001 CUSTOM TUNED ENGINESGET ORGANIZED WA TCB FOR COMPETITION CCESSORIES Here s set 4 study ties holds Os. Special GY 014 X 60 solid lines $295 ppd 4 years yoo taoorie 5 azrses MRGUSI Custom needle valves racing wheels 4 MAG FILES $495 Quick fills fuel shut-offs 8 others lBS pbs 51 50 postage wsd handieg detailed brochure send 25 cents to wwgms Kustom Kraftsmanshlp Box 2699 Laguna Hills P0 BOX 388-K CalIf 92653 Ph 714 830-5162DOVER NH 03620 amount detail first instructionThe Sigkit shows optional non-scale enlarge- summary Wendells plans well drawn manual Since majority persons purchas-ment ailerons rolland contain sufficient detail rank ing plans experienced really unnecessaryperformance never outstanding Wendellbeginner Both designs have suc go great detail However some clarifica-opted go four ailerons increase perform-cessfully flown have seen Wendell fly tion explanations may helpfulance servos drive lower wing unitsLiberty Sport smooth realistic the time written would havewith coupling struts upper wing aileronsair can certainly recommend Im agreed Im getting more questionsUnless Scale purist added flightawfully tempted Jungmeister people relative newcomers toagility far outweighs slightly non-scale appear-the time Both plans listed $2150 modeling same time newcomers willancenotes inflation may have changed usually build two kits before taking construction both planes follows usualWrite Wendell Hostetler 1041 Heatherwood step toplan building Wendells plans instruc-modeling practice some material substitu-Lane Orrville OH 44667 tions adequate anyone except absolutetions Basswood specified areas tyrois nice material work readily Bob Beckman 8248 Holly Grove Court two plans very similar waysavailable especially longer lengths SpruceManassas VA 22110 703 369-2432 comments will apply both Theycould substituted desired consist two sheets 42-in X 82-in lot balsa called out As have saidR C Aerobatics/Van Putte instruction manual manuals containbefore substitutes balsa canContinued page 29 some interesting useful information en-really cut down cost big birds gines servos flying etc addition construc-meant criticism plans sugges-chord line commonly usedand tion details particularly useful item istions want try some newdont know could 17% difference relatively complete bill materialsmethods Foam-core board available artistsin pitch flat-faced pitch say 8-in Anyone has built Sig Liberty Sportsupply stores makes beautiful wing ribs andcompared 8-in zero-lift-hue pitch Question will have feeling deja vu working withfuselage formers think could replace thewhat pitch reference does Top Flite use Zinger plans However addition expectedfull-length 3/16-in sheet balsa fuselage sidesMaster Airscrew Etc Does anyone know changes materials sizes twoThe cost difference would significant BalsaWorse yet according Bill Cassidy prop significant differences Wendell uses simpleblocks used filling shaping can often bemaker Colorado another problem effective method making tail surfacesreplaced rigid insulation foam Just keep inactual performance prop vs pitch removable can aid transportationmind foam cant take dope littlestamped hub pitch distri problem other change ailerons theHobbypoxy No 2 glue brushed onto exposedbution used manufacturer Tests have full-scale airplane has lower wing ailerons onlyfoam surface does trickshown greater efficiency attained tip FUN SCALE IS HERE Easier Fly Yet Very Maneuverable Over 20 step-by-step budding illustrations COBRA easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice 19-25 Engine 4695 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq unique 0 oz wing loadingCan Built Flown 7 Dayswrite free Catalog ellusinates dihedral hraces3Y4-4 lbsDue New Construction Techniques JEMCO wing heeling Upright Engine 1305 Foothill Dr Vista CA 92083 Deslgaed Iron-on coveringsWILL FLY AS SLOW AS PIPER CUB MODEL714 724-3242 108 Model Aviation MASTER AIRSCREW PRESENTS BALSA STRIPPER 495 AT YOUR DEALER PRECISION STRIP WOOD TO x INS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOL T PRICE WINDSOR PROPELLER CO PO BOX 112 WINDSOR CA 95492 propeller pitched up slightly 10 1 0 above established pitch center section should pitched down slightly station prop actually correct 75% station pitch measured other stations little above little below geometric pitch net effect slightly increase average pitch prop manufacturer must experiment pitch distribution stick props designs will know prop will perform Efficiency constantly changing rpm Model props turn such high rpm have efficiencies 40% 50% am still confused two components prop thrust think thrust generated both upper face prop approximately what percentage thrust con tributed eachand what speeds want thank time effort put column reply Dont know what want letter Ive got good idea would appreciate comments would care make comments column will short due lack space next month Ill talk about percentage thrust generated two sides prop Basically agree everything Bill Cassidy alleged have said alluded differences way prop manufacturers made products April 1980 column As far what want complex controversial letters can see what did Others like same other subjects welcome encour aged general interest Ill see get printed Ron Van Putte 111 Sleepy Oaks Rd Fort Walton Beach FL 32548 FF Old-Timers/Haught Continued page 54 like use nearly full-strength adhering covering Acrylic lacquer thinner obtainable automotive supply house works well either nitrate butyrate dope Acrylic lacquer thinner comes three grades cleanup thinner works fine cheap does produce high gloss does soften previous coats great degree light-penetration thinner does soften some high gloss thinner has deep penetration Various brand names available have basic grades Butyrate dope may applied over nitrate dope vice versa Some builders begin finish nitrate complete epoxy paints either clear pigmented personally like keep finishes pure throughout easier patch repair basic dope finishes Initial coats dope should brushed ensure good bond Later coats may sprayed good ventilation available Brushing first coat fabric particularly silk can problem dope tends brushed through cloth runs down inside creating blisters fabric problem can virtually eliminated applying dope fo new foam brushes Just dip brush dope drag across fabric lays film dope surface will soak enough good bond creating blister effect Dont go over wet areasjust overlap slightly pass brush About five coats dope should provide serviceable finish depend ing course much dope thinned like bring up light gloss stop Less 77Dave Dlatt iviodels Inc Air cylinder 5/8 bore New design Y-LOCK provides positive lock UP asd DOWN Mt super-tough Only 1 3/8 high fits airfoilCAPRON Low profile asd overall compact size Retraction angle t5 9O --specify ordering Lz fl7 DEVELOP Massive legs--i /2 diameter alloy 1* spring shock-absorbing bottom end L included REFINE EXPAND Experience RLG System customers ourselves over past 2 years has resulted numerous mechanical revisions improvements have incorporated fanfare significant result has highly refined retract system large models io 30 lbs Besides being used own 1/5 scale kits recommended Bud Nosen P-Si P47 Vito Fomeo big Sea Fury several others versatility system has expanded several ways have choice 850 900 retraction angle choice leg-under-cylinder leg-away-from-cylin der offer free leaflet describing simple modification up-and-twist Corsair style operation another showing noseleg modification Different coils available unique oleo shock-legs handle various weights model instructions now include details tail wheel hookup Sure Piper Cubs nice youre thinking about large-scale model retract-gear ship Dave Platt RLG System has made designs possibleSystem Price $12900 Outfit Includes 2 main units shock-legs air tank switcher pressure indicator tubing etc booklet Optional extras -- pump speed reducers extra air tanks Dave Platt products available dtrectlt/ manufacturer ONLY Send check Money Order Visa MasterCard number C 0 D orders also accepted /97DlattVISA j6951 Northwest 15th Avenue oaveEvuodels Fort Lauderdale Florida 33309 call 305/587-4861 evenings AIRO Meets SAM RC Antique & Old Timer events School Yard trainer mu —VVviijDELIts size weight make secellent chotne ton mire parts formed shape II Contains complete hardware package including miniB 8~yv R D G IiI E adisotable puohrod connectors screws blind nets Balsa wheel kit 4 wheel halves plastrc bearings washers wheel retainers pro-fabrication material selection otthe Mike surpasses Tyro Playboy Senior sPEcIFIcATIONS mnt5vanaO5 OveAii Lengthn mint chora70 Mn Sen wgt75 inns Aea sq Snorne sun -os PLAYBOY SENIOR Still Available $49 95 plus 3 00 freight tr handling Price S2895 Hobby Dealer ordering direcn please add $250 freight handling & insurance California residents add 6% Salon Tax Manufactured Tyro Models Designed no Flyll 1930 EDGEWOOD DR. PO BOX 11511 PALO ALTO CA 94306 415 856-7781 uary 1981 109