C OLD TIMERS Dee B Mathews IN very early days engine-powered free flight such pioneers Frank Ehling Maxwell Bassett Joe Koval actually entered com peted rubber endurance events gasengine-powered models rules course quickly changed place Brown Loutrel- later became GHQ powered models own special category earliest rules involved little unlimited motor run flights timed until model out sight 005 Ehling reported flight last sighted Douglas mail plane over Lake Erie 4 hours 35 minutes after launched inevitable lost model problem quickly led pioneers recognize need some limitation engine runs earliest limited-run rules used fuel allotment based model weight Texas Oil Co Texaco donated trophy GMAA AMAs predecessors used perpetual award winner National Championships limited-engine-run event unique trophy fell disuse newer rules came vogue dis carded due lack storage space advent SAM movement renewed interest flying Texaco free-flight event initially reproduction Texaco Trophy made RC Texaco now flown uses e fuel pound model weight l/4 oz maximum Some local contest rules further re duce allotment /s ounce winning times still often excess hour Eligible designs under SAM rules published kitted prior 1939 Lanzo Record Breaker Dallaire Ehling Contest Winner Shereshaw Cumulus usually dominating event Several active Texaco participants have enlarged already huge designs 12 14 foot spans using chain saw engines power obvious inconvenience transporting storing such large models coupled large capital expenditure required has motivated SAM 49Los Angeles andother West Coastchapters experiment Texaco first contest concept Taft CA Dec 5 1979 part 49ers Annual great deal interest generated Don Bekins winning 36 eleven ounce Thermal Thumber flying 12 minutes Among models being prepared SAM 30s March Texaco event Jack Altons Reduced Playboy Ted Kafers Ehling John Ponds Triangle Charley Critchs Dallaire As presently structured Texaco rather low pressure minimal rule fly-for-the-fun-of-it event current limit models must use Cox reed-valve engines Fuel quantity limited much fuel contestant can squeeze standard integral tank No limits have placed size weight area design eligible As could anticipated several further limi tations being considered West Coast chapters Among 8 ounce per square foot minimum weight Texaco-eligible designs Further experience will undoubtedly reveal other minor modifications needed fact remains however concept has proven workable challenging importantly enjoyable early work SAM 49 group would indicate need lightly built 36 t6 46 model powered either Black Widow QRC engine Weight build-up model size rapid critical ounce weight increase can represent 8% 10% gain However opportunity does exist utilize ones existing flight packs rather micro systems structural weight watched carefully Conversely 2 3 ounces saved dead weight does provide micro user latitude building mention improved ease installing small equipment rather crowded confines models own rather limited experiences hA Old Timers would indicate several potential problem areas precautions 2000 ft altitude area can render relatively large models very slow climb much sea level Im sure normal wind velocity area such consider 10 knots calm models tend drift Out sight very quickly presenting some need bright colors reflective mylar good vision Certainly challenging insurmountable problems Since current rules prohibit use Davis Diesel conversions Cox engines diesel could well add true fuel efficiency factor new event Surprisingly kit know suitable use Texaco RN models new Simplex Paul Plecan design Hobby Horn has kit Continued page 98 22 Model Aviation Ernie Payne builtthls plane tookine picture too Craft isa Lanzo Record Breaker built Hobby Horn plans Wing spans 50 power 04g Bob Sliff readies Simplex forflight isa RN Models kit spans 40 weighs 18 oz Ross holds 50 span Varsity Plane weighs 16 oz flew 10 mm first-ever /zA Texaco event SAM 49 Meet held Decem ber 121979 Taft CA Ernie Payne photo Doc Mathews Kioud King approaches Flight shot Bruce Mathews SR -71 reconnaissance 1 ale 240 45 engines 554 F9F5 PantherDynajetor Fan 355 P560 Sabre43 PS Crusader38 U2 Spyplane'103 PR6L Sabre UC Dynajet 37 P4J Phantom RC 1ropeller Driven P38 LightningRC 240-45 eng52 P-39 AiracobraRC 245-6051 P40 WarhaukRC 2 45-60 375 P828 Twin MustangRC 225-40 52 177 Cessna CardinalRC 60 engine725 F Make Glow Diesell From1hAtoY4ScalePower Usable Power Greater Economy I See AMA Bonus Benefit Coupons huge introductory discount dont forget stamped envelope J Davis Diesel Development Inc RC ScaIe/Wischers Continued page 61 Navajo will reCeive 20% added its flight score Ralph Jackson member winning 1974 US team entry Aerolympics World Championship Lakehurst NJ plane Ottawa will Windecker Eagle flew second place Sport Scale Lincoln Nats Harold Parenti prolific scale modelers competition always among top fin ishers everyone thought Bearcat would hard beat has elected build entirely new Mitsubishi Zero Its conventional retract landing gear will add 10% flight score Precision Scale FAI F4C team consists George Rose Bob Underwood Bbb Wischer George will use Curtiss Hawk P 6E has flown since 1977 Riverside Nats narrowly missed making 1978 team has polished flying technique Hawk get plane biplane tail wheel will give George additional 10% added flight score Georges extensive documentation Hawk result personal contact plane Daytons Air Force Museum Bob Underwood has built superior replace ment Sorrell Hiperbipe destroyed air show following Nats Lincoln hard see improvement could made hopes better flight perfortnance possibly diesel engine biplane conventional gear tailwheel Hiperbipe eligible 10% flight score bonus Bob Wisehers Piel Beryl becomes baCkup plane used event problems new Douglas A-20G attack bomber twin engine Douglas will feature retractable working oleo gear bomb drop Retracts two engines will add bonus 20% flight score would appear trend greater complexity has begun five six entries will take advantage additional bonuses offered Rib Stitching Examine wings tail surfaces fabric covered plane Note fabric held ribs cord stitching 1077$3250 4951450 471450 531450 5251450 3751250 5151450 381250 441250 31751250 3651250 551250 GET ORGANIZED Hen s set nI 4 shady lies hnIds 4 neWs ni vein taneijO 8 t t magazines 4 MAG FILES $495 Send 5495 pIns $100 in pealage tiaziethig DOM #WUSTRES PO BOX 388-K DOVER NH OSUC extends through wing bottom top surfaces Removing inspectionover enable viewing wing interior shows solid mass vertical cords plane would unsafe top surface lift transmitted structure through very thin strong cords Peeling fabric no longer problem some WW planes reputations coming apart Cord fed through wing during stitching long needle immediately adjacent rib crosses over rib upper surface back through wing lower surface knotted proceeds next loop along bottom Beneath cord stretched along rib surface narrow reinforcing tape approximately rib width Stitching complete wing covered pinked tape has serrated edges zig-zag pattern Fiberglass rib tapes have smooth edge pinking used planes covered Razorback fiber glass covering system Pinked tape models can made doping top bottom surfaces Jap tissue stretched over open frame dry tissue sheet cut scale width strips using serrated tearoff edge Reynolds aluminum foil box tearing pattern simulate pinked edge box edge needs backed up hardwood keep straight during cutting Stitching seen finished wing slightly raised elongated bump straddles rib right angles Degree visibility depends depth finish applied produce simulated stitching tape surface emboss tapes back surface dull screw driver pressing blade tape supported soft pine block impression remains Tape cemented wing centered over rib embossments protruding upward making tapes must kept mind number stitches doubled area wing subjected propeller slip stream Stitching used airfoil surfaces fuselage stringers embossing process can automated Using circular saw blade has no set its teeth roll blade down length tape moderate pressure avoid cutting through stitch impressions will result absolutely equal increments almost too perfect wooden slotted guide hold tape rolling blade helpful metal cutting blade proper tooth spacing model 1/6th size Visibility pinking serrations stitching varies depending upon depth finish applied have seen planes Grumman Gulfhawk comes mind have built-up filled finish almost obliterates detail serrations Stitching remains quite easily seen however Keep mind too wings bottom surface cord stretching between stitches visible line running parallel rib edge Bolt Dolly Wischer Ri 1 S-22lLapham Peak Rd Delafleld WI 53018 RC Old Timers/Mathews Continued page 22 plus plans 40 Lanzo illustrated photo Several designs originally intended Atom motor listed John Ponds catalog might prove satisfactory currently published Old Timer can locate 60% Westerner Model Builder 4-76 plan #4761 Surely others cant locate summary would appear Texaco will prove event strong appeal automobiles excess spendable incomes both shrinking face Arabs greed would predict rapid spread interest concept throughout modeling community long glorious life modernizedancient event Lets plan enjoy Tooting Hobby Horn Bob Slims Hobby Horn 112 Main Street Seal Beach CA 90740 veritable Cornucopia kits plans accessories Old Timer devotee com plete stock Schmidt P&W short kits R/N Micro Midway formerly Cal Aero full kits well Yates Orwick Y&O props available Accessories run Trexler wheels plans Bowden Mouse Send dollar illustrated catalog its mind boggling MAM Karl Spielmaker Bob Pattison Joe Kresnak organizing Michigan Antique Modelers Club plan hold several contests Hastings Three Rivers area summer invite interest Old Timers antiques rubber OT contact will publish bi-monthly newsletter swap sheet Interested parties should contact Karl Spielmaker 4690 Burlingame 5 W Wyoming MI 49509 SAM Society Antique Modelers 1980 dues now due have renewed would like join advised dues will increase 51000 after June 11980 plan live another 7 years Life Membership $7500 could represent bargain well hedge against inflation 1981 rules proposals distributed vote Jan-Feb issue SAM Speaks long interesting list changes additions presented free flight section will affect RC OT Proposal #8 allow diesel engines manufactured before 1950 compete original spark ignition engines would inappropriate comment free flight proposals cannot resist noting problem will arise #8 accepted engine committee will have rule whether Indian Mills 075 13 engines Indy R/C importing eligible Either way converted-to-diesel units Bob Davis will still allowed pity really 98 Model Aviation NEW Ducted Fan RC Scale Plans wispanlength price Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDI VAR 1608 LANDES Ct MODESTO CA 95350 USA Shielding spark ignition Steve Auman Jena LA Process Engineer Beldon Corp maker automotive ignition wire suggests Beldon IRS ignition cable amethodof control ling radio frequency RF interference running spark ignition engine RC says wire has 10000 ohms resistance per foot shield suppress ignition noises auto radios should produce similar effect resistor high tension wire editor Bill Winter mentioned earlier Ive tried Im playing new transistorized ignition system TIS will report two months hence However anyone has experience type c able would please share experience us Im subject RE interference problems Fred Collins reminded developed shielded ignition system box featured Model Builders March 1974 issue rejected time beyond limited electronic knowledge however Fred advises needed components available Radio Shack stores minimal skills needed fabricate reader interested Freds system cannot obtain copy magazine article send large SASE copy schematic Fred says avoid metal pushrods throttle mount -watt resistor top ignition coil avoid breakage An article Charles Kenney February 1975 issue ModelAirplane News described similar shield ed ignition system utilizing rechargeable nicad battery Need mounting bracket Eli7 Yes such exotic accessories Morton M/5 Distri butor rotors fuel tank reproductions old time engines available Fred Collins 29 Stewart Avenue Pittsburgh PA 15227 Send SASE Fred list details Goodyear blimps beware Bill Effinger Berkeley Models interesting flights 1936 original Buccaneer Lakehurst NAS flew dirigible Los Angeles moored time fortunately ripped 30 feet its fabric next flight Buccaneer went cranberry bog went looking got lost tracked Out another Navy blimp About week later blimp located model Well least couldnt have too upset Bill recently retired Atlanta back modeling mood bunch interesting projects underway Could red white kit boxes coming back Dee B Mathews 506 S Walnut Greensburg KS 67054 * roam cure ana aaaa ukmna w * Machine cut selected balsa ply * * Attractive molded canopy * * 5132 dia preformed gear * * Complete hardware package * * Rolled full size p lan Isometrics * / Illustrated stepbystep Instructions * F-. An aircraft style grace beautiful V tailed machine designed Sunday sport flyer Du Bra Mixer controls tail surfaces performance outstanding Like sister-ship Executive structure mostly balsa 114 siding absorbs rigors active practice Youll like way parts fit Its good kit value real performer beautiful bird fly DEALER INQUIRIES INVITED kept stock Heliboy helicopters enough distance between rotor tail boom prevent tail boom strike Inverted flying can cause blades come close striking distance under some circum stances instance change positive pitch full negative pitch high blade rpm holding rear awash plate command could cause strike since blade will over bite Similarly strike might occur blade speed down hard rear awash plate command given since may suffici ent centrifugal force keep blades flexing boom Throttle collective throttle will have equipped either throttle hold throttle governor throttle hold set-up means 5th servo micro switch opens circuit throttle servo thereby locking servo throttle position desired approx Y open though collective changes can made assume micro switch actuated cam collective servo output arm DRC governor offers advantage nearconstant blade speeds collective pitch passes through zero degrees pitch An electronic governor developed few years ago Al Erwin also requires fifth servo Tach-Tron may still available chose throttle hold set-up fly inverted Heliboy youll need approximately 16 degrees total collective pitch travel half stick transmitter should have zero degrees pitch Movement stick forward should give approximately 8 degrees positive pitch movement stick full back should give approximately 8 degrees negative must modify pitch change wire rebending limited plastic follower Helicopters other Heliboy may need similar modifications general inverted flying requires increasing total collective pitch required plus addition fifth servo Tail rotor mixer tail rotor mixer modification may beneficial sinceideally tail rotor mix should give compensation whether main rotor pitch changing positive pitch nega tive pitch dont use tail rotor compensator ships because dont fly spring-centered stick like pilots anyway Theres really no center trim position flying helicopter aware instant collective pitch passes through negative back through positive pitch tail rotor must attended order compensate torque changes Remember now torque both positive negative settings since engine deliver ing power blades Transmitter reversing switches have used transmitter reversing switches inverted flying Continued page 23 explained example broom being suspended its handle attempting support broom upright its handle balanc ing broom hand Unlike suspended broom strong inputs required displace broom its vertical position supported broom requires strong inputs return broom vertical position further vertical power required return helicopter tendency fuselage return its natural position suspended beneath rotor just pendulum broom will return its vertical position am still doing lot testing because have answered questions about inverted flight can done few tips follow Helicopter markings problems inverted flight retraining yourself observe helicopter different manner usual vtsual clues no longer apply usually watch skids rotor disc flying inverted rotor disc seems disappear skid usually sight Youll have acquire new approach looking machine especially inverted turns steep banking left hand turn appears steep right hand turn Nose up maneuvers such stall turns will also upset judgement since again visual clues misleading photographs show mark rngs use reinforce other visual references machine inverted Fuel tank engine adjustment fuel tank must modified inverted flight otherwise youll pouring fuel over flying field Im using dual-vented tank center pick up Youll need install vent top other bottom Both vents must fitted stiff length fuel tubing bottom vents top tank vice versa fuel pick-up done normal manner sure install filter complete tank modification fill halfway invert tank should no binding pick-up tube Remember cant land adjust needle youre inverted Another important point needle valve adjustment ship inverted entire tank higher needle valve causing engine run very rich inverted Care must used adjusting needle valve want engine slightly leaner used running does mean lean means nor rich Perhaps Robart Automix pumper would valuable DRC Coning angle main rotor coning angle June 1980 99 RC Helicopters/Chesney
Edition: Model Aviation - 1980/06
Page Numbers: 22, 98, 99
C OLD TIMERS Dee B Mathews IN very early days engine-powered free flight such pioneers Frank Ehling Maxwell Bassett Joe Koval actually entered com peted rubber endurance events gasengine-powered models rules course quickly changed place Brown Loutrel- later became GHQ powered models own special category earliest rules involved little unlimited motor run flights timed until model out sight 005 Ehling reported flight last sighted Douglas mail plane over Lake Erie 4 hours 35 minutes after launched inevitable lost model problem quickly led pioneers recognize need some limitation engine runs earliest limited-run rules used fuel allotment based model weight Texas Oil Co Texaco donated trophy GMAA AMAs predecessors used perpetual award winner National Championships limited-engine-run event unique trophy fell disuse newer rules came vogue dis carded due lack storage space advent SAM movement renewed interest flying Texaco free-flight event initially reproduction Texaco Trophy made RC Texaco now flown uses e fuel pound model weight l/4 oz maximum Some local contest rules further re duce allotment /s ounce winning times still often excess hour Eligible designs under SAM rules published kitted prior 1939 Lanzo Record Breaker Dallaire Ehling Contest Winner Shereshaw Cumulus usually dominating event Several active Texaco participants have enlarged already huge designs 12 14 foot spans using chain saw engines power obvious inconvenience transporting storing such large models coupled large capital expenditure required has motivated SAM 49Los Angeles andother West Coastchapters experiment Texaco first contest concept Taft CA Dec 5 1979 part 49ers Annual great deal interest generated Don Bekins winning 36 eleven ounce Thermal Thumber flying 12 minutes Among models being prepared SAM 30s March Texaco event Jack Altons Reduced Playboy Ted Kafers Ehling John Ponds Triangle Charley Critchs Dallaire As presently structured Texaco rather low pressure minimal rule fly-for-the-fun-of-it event current limit models must use Cox reed-valve engines Fuel quantity limited much fuel contestant can squeeze standard integral tank No limits have placed size weight area design eligible As could anticipated several further limi tations being considered West Coast chapters Among 8 ounce per square foot minimum weight Texaco-eligible designs Further experience will undoubtedly reveal other minor modifications needed fact remains however concept has proven workable challenging importantly enjoyable early work SAM 49 group would indicate need lightly built 36 t6 46 model powered either Black Widow QRC engine Weight build-up model size rapid critical ounce weight increase can represent 8% 10% gain However opportunity does exist utilize ones existing flight packs rather micro systems structural weight watched carefully Conversely 2 3 ounces saved dead weight does provide micro user latitude building mention improved ease installing small equipment rather crowded confines models own rather limited experiences hA Old Timers would indicate several potential problem areas precautions 2000 ft altitude area can render relatively large models very slow climb much sea level Im sure normal wind velocity area such consider 10 knots calm models tend drift Out sight very quickly presenting some need bright colors reflective mylar good vision Certainly challenging insurmountable problems Since current rules prohibit use Davis Diesel conversions Cox engines diesel could well add true fuel efficiency factor new event Surprisingly kit know suitable use Texaco RN models new Simplex Paul Plecan design Hobby Horn has kit Continued page 98 22 Model Aviation Ernie Payne builtthls plane tookine picture too Craft isa Lanzo Record Breaker built Hobby Horn plans Wing spans 50 power 04g Bob Sliff readies Simplex forflight isa RN Models kit spans 40 weighs 18 oz Ross holds 50 span Varsity Plane weighs 16 oz flew 10 mm first-ever /zA Texaco event SAM 49 Meet held Decem ber 121979 Taft CA Ernie Payne photo Doc Mathews Kioud King approaches Flight shot Bruce Mathews SR -71 reconnaissance 1 ale 240 45 engines 554 F9F5 PantherDynajetor Fan 355 P560 Sabre43 PS Crusader38 U2 Spyplane'103 PR6L Sabre UC Dynajet 37 P4J Phantom RC 1ropeller Driven P38 LightningRC 240-45 eng52 P-39 AiracobraRC 245-6051 P40 WarhaukRC 2 45-60 375 P828 Twin MustangRC 225-40 52 177 Cessna CardinalRC 60 engine725 F Make Glow Diesell From1hAtoY4ScalePower Usable Power Greater Economy I See AMA Bonus Benefit Coupons huge introductory discount dont forget stamped envelope J Davis Diesel Development Inc RC ScaIe/Wischers Continued page 61 Navajo will reCeive 20% added its flight score Ralph Jackson member winning 1974 US team entry Aerolympics World Championship Lakehurst NJ plane Ottawa will Windecker Eagle flew second place Sport Scale Lincoln Nats Harold Parenti prolific scale modelers competition always among top fin ishers everyone thought Bearcat would hard beat has elected build entirely new Mitsubishi Zero Its conventional retract landing gear will add 10% flight score Precision Scale FAI F4C team consists George Rose Bob Underwood Bbb Wischer George will use Curtiss Hawk P 6E has flown since 1977 Riverside Nats narrowly missed making 1978 team has polished flying technique Hawk get plane biplane tail wheel will give George additional 10% added flight score Georges extensive documentation Hawk result personal contact plane Daytons Air Force Museum Bob Underwood has built superior replace ment Sorrell Hiperbipe destroyed air show following Nats Lincoln hard see improvement could made hopes better flight perfortnance possibly diesel engine biplane conventional gear tailwheel Hiperbipe eligible 10% flight score bonus Bob Wisehers Piel Beryl becomes baCkup plane used event problems new Douglas A-20G attack bomber twin engine Douglas will feature retractable working oleo gear bomb drop Retracts two engines will add bonus 20% flight score would appear trend greater complexity has begun five six entries will take advantage additional bonuses offered Rib Stitching Examine wings tail surfaces fabric covered plane Note fabric held ribs cord stitching 1077$3250 4951450 471450 531450 5251450 3751250 5151450 381250 441250 31751250 3651250 551250 GET ORGANIZED Hen s set nI 4 shady lies hnIds 4 neWs ni vein taneijO 8 t t magazines 4 MAG FILES $495 Send 5495 pIns $100 in pealage tiaziethig DOM #WUSTRES PO BOX 388-K DOVER NH OSUC extends through wing bottom top surfaces Removing inspectionover enable viewing wing interior shows solid mass vertical cords plane would unsafe top surface lift transmitted structure through very thin strong cords Peeling fabric no longer problem some WW planes reputations coming apart Cord fed through wing during stitching long needle immediately adjacent rib crosses over rib upper surface back through wing lower surface knotted proceeds next loop along bottom Beneath cord stretched along rib surface narrow reinforcing tape approximately rib width Stitching complete wing covered pinked tape has serrated edges zig-zag pattern Fiberglass rib tapes have smooth edge pinking used planes covered Razorback fiber glass covering system Pinked tape models can made doping top bottom surfaces Jap tissue stretched over open frame dry tissue sheet cut scale width strips using serrated tearoff edge Reynolds aluminum foil box tearing pattern simulate pinked edge box edge needs backed up hardwood keep straight during cutting Stitching seen finished wing slightly raised elongated bump straddles rib right angles Degree visibility depends depth finish applied produce simulated stitching tape surface emboss tapes back surface dull screw driver pressing blade tape supported soft pine block impression remains Tape cemented wing centered over rib embossments protruding upward making tapes must kept mind number stitches doubled area wing subjected propeller slip stream Stitching used airfoil surfaces fuselage stringers embossing process can automated Using circular saw blade has no set its teeth roll blade down length tape moderate pressure avoid cutting through stitch impressions will result absolutely equal increments almost too perfect wooden slotted guide hold tape rolling blade helpful metal cutting blade proper tooth spacing model 1/6th size Visibility pinking serrations stitching varies depending upon depth finish applied have seen planes Grumman Gulfhawk comes mind have built-up filled finish almost obliterates detail serrations Stitching remains quite easily seen however Keep mind too wings bottom surface cord stretching between stitches visible line running parallel rib edge Bolt Dolly Wischer Ri 1 S-22lLapham Peak Rd Delafleld WI 53018 RC Old Timers/Mathews Continued page 22 plus plans 40 Lanzo illustrated photo Several designs originally intended Atom motor listed John Ponds catalog might prove satisfactory currently published Old Timer can locate 60% Westerner Model Builder 4-76 plan #4761 Surely others cant locate summary would appear Texaco will prove event strong appeal automobiles excess spendable incomes both shrinking face Arabs greed would predict rapid spread interest concept throughout modeling community long glorious life modernizedancient event Lets plan enjoy Tooting Hobby Horn Bob Slims Hobby Horn 112 Main Street Seal Beach CA 90740 veritable Cornucopia kits plans accessories Old Timer devotee com plete stock Schmidt P&W short kits R/N Micro Midway formerly Cal Aero full kits well Yates Orwick Y&O props available Accessories run Trexler wheels plans Bowden Mouse Send dollar illustrated catalog its mind boggling MAM Karl Spielmaker Bob Pattison Joe Kresnak organizing Michigan Antique Modelers Club plan hold several contests Hastings Three Rivers area summer invite interest Old Timers antiques rubber OT contact will publish bi-monthly newsletter swap sheet Interested parties should contact Karl Spielmaker 4690 Burlingame 5 W Wyoming MI 49509 SAM Society Antique Modelers 1980 dues now due have renewed would like join advised dues will increase 51000 after June 11980 plan live another 7 years Life Membership $7500 could represent bargain well hedge against inflation 1981 rules proposals distributed vote Jan-Feb issue SAM Speaks long interesting list changes additions presented free flight section will affect RC OT Proposal #8 allow diesel engines manufactured before 1950 compete original spark ignition engines would inappropriate comment free flight proposals cannot resist noting problem will arise #8 accepted engine committee will have rule whether Indian Mills 075 13 engines Indy R/C importing eligible Either way converted-to-diesel units Bob Davis will still allowed pity really 98 Model Aviation NEW Ducted Fan RC Scale Plans wispanlength price Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDI VAR 1608 LANDES Ct MODESTO CA 95350 USA Shielding spark ignition Steve Auman Jena LA Process Engineer Beldon Corp maker automotive ignition wire suggests Beldon IRS ignition cable amethodof control ling radio frequency RF interference running spark ignition engine RC says wire has 10000 ohms resistance per foot shield suppress ignition noises auto radios should produce similar effect resistor high tension wire editor Bill Winter mentioned earlier Ive tried Im playing new transistorized ignition system TIS will report two months hence However anyone has experience type c able would please share experience us Im subject RE interference problems Fred Collins reminded developed shielded ignition system box featured Model Builders March 1974 issue rejected time beyond limited electronic knowledge however Fred advises needed components available Radio Shack stores minimal skills needed fabricate reader interested Freds system cannot obtain copy magazine article send large SASE copy schematic Fred says avoid metal pushrods throttle mount -watt resistor top ignition coil avoid breakage An article Charles Kenney February 1975 issue ModelAirplane News described similar shield ed ignition system utilizing rechargeable nicad battery Need mounting bracket Eli7 Yes such exotic accessories Morton M/5 Distri butor rotors fuel tank reproductions old time engines available Fred Collins 29 Stewart Avenue Pittsburgh PA 15227 Send SASE Fred list details Goodyear blimps beware Bill Effinger Berkeley Models interesting flights 1936 original Buccaneer Lakehurst NAS flew dirigible Los Angeles moored time fortunately ripped 30 feet its fabric next flight Buccaneer went cranberry bog went looking got lost tracked Out another Navy blimp About week later blimp located model Well least couldnt have too upset Bill recently retired Atlanta back modeling mood bunch interesting projects underway Could red white kit boxes coming back Dee B Mathews 506 S Walnut Greensburg KS 67054 * roam cure ana aaaa ukmna w * Machine cut selected balsa ply * * Attractive molded canopy * * 5132 dia preformed gear * * Complete hardware package * * Rolled full size p lan Isometrics * / Illustrated stepbystep Instructions * F-. An aircraft style grace beautiful V tailed machine designed Sunday sport flyer Du Bra Mixer controls tail surfaces performance outstanding Like sister-ship Executive structure mostly balsa 114 siding absorbs rigors active practice Youll like way parts fit Its good kit value real performer beautiful bird fly DEALER INQUIRIES INVITED kept stock Heliboy helicopters enough distance between rotor tail boom prevent tail boom strike Inverted flying can cause blades come close striking distance under some circum stances instance change positive pitch full negative pitch high blade rpm holding rear awash plate command could cause strike since blade will over bite Similarly strike might occur blade speed down hard rear awash plate command given since may suffici ent centrifugal force keep blades flexing boom Throttle collective throttle will have equipped either throttle hold throttle governor throttle hold set-up means 5th servo micro switch opens circuit throttle servo thereby locking servo throttle position desired approx Y open though collective changes can made assume micro switch actuated cam collective servo output arm DRC governor offers advantage nearconstant blade speeds collective pitch passes through zero degrees pitch An electronic governor developed few years ago Al Erwin also requires fifth servo Tach-Tron may still available chose throttle hold set-up fly inverted Heliboy youll need approximately 16 degrees total collective pitch travel half stick transmitter should have zero degrees pitch Movement stick forward should give approximately 8 degrees positive pitch movement stick full back should give approximately 8 degrees negative must modify pitch change wire rebending limited plastic follower Helicopters other Heliboy may need similar modifications general inverted flying requires increasing total collective pitch required plus addition fifth servo Tail rotor mixer tail rotor mixer modification may beneficial sinceideally tail rotor mix should give compensation whether main rotor pitch changing positive pitch nega tive pitch dont use tail rotor compensator ships because dont fly spring-centered stick like pilots anyway Theres really no center trim position flying helicopter aware instant collective pitch passes through negative back through positive pitch tail rotor must attended order compensate torque changes Remember now torque both positive negative settings since engine deliver ing power blades Transmitter reversing switches have used transmitter reversing switches inverted flying Continued page 23 explained example broom being suspended its handle attempting support broom upright its handle balanc ing broom hand Unlike suspended broom strong inputs required displace broom its vertical position supported broom requires strong inputs return broom vertical position further vertical power required return helicopter tendency fuselage return its natural position suspended beneath rotor just pendulum broom will return its vertical position am still doing lot testing because have answered questions about inverted flight can done few tips follow Helicopter markings problems inverted flight retraining yourself observe helicopter different manner usual vtsual clues no longer apply usually watch skids rotor disc flying inverted rotor disc seems disappear skid usually sight Youll have acquire new approach looking machine especially inverted turns steep banking left hand turn appears steep right hand turn Nose up maneuvers such stall turns will also upset judgement since again visual clues misleading photographs show mark rngs use reinforce other visual references machine inverted Fuel tank engine adjustment fuel tank must modified inverted flight otherwise youll pouring fuel over flying field Im using dual-vented tank center pick up Youll need install vent top other bottom Both vents must fitted stiff length fuel tubing bottom vents top tank vice versa fuel pick-up done normal manner sure install filter complete tank modification fill halfway invert tank should no binding pick-up tube Remember cant land adjust needle youre inverted Another important point needle valve adjustment ship inverted entire tank higher needle valve causing engine run very rich inverted Care must used adjusting needle valve want engine slightly leaner used running does mean lean means nor rich Perhaps Robart Automix pumper would valuable DRC Coning angle main rotor coning angle June 1980 99 RC Helicopters/Chesney
Edition: Model Aviation - 1980/06
Page Numbers: 22, 98, 99
C OLD TIMERS Dee B Mathews IN very early days engine-powered free flight such pioneers Frank Ehling Maxwell Bassett Joe Koval actually entered com peted rubber endurance events gasengine-powered models rules course quickly changed place Brown Loutrel- later became GHQ powered models own special category earliest rules involved little unlimited motor run flights timed until model out sight 005 Ehling reported flight last sighted Douglas mail plane over Lake Erie 4 hours 35 minutes after launched inevitable lost model problem quickly led pioneers recognize need some limitation engine runs earliest limited-run rules used fuel allotment based model weight Texas Oil Co Texaco donated trophy GMAA AMAs predecessors used perpetual award winner National Championships limited-engine-run event unique trophy fell disuse newer rules came vogue dis carded due lack storage space advent SAM movement renewed interest flying Texaco free-flight event initially reproduction Texaco Trophy made RC Texaco now flown uses e fuel pound model weight l/4 oz maximum Some local contest rules further re duce allotment /s ounce winning times still often excess hour Eligible designs under SAM rules published kitted prior 1939 Lanzo Record Breaker Dallaire Ehling Contest Winner Shereshaw Cumulus usually dominating event Several active Texaco participants have enlarged already huge designs 12 14 foot spans using chain saw engines power obvious inconvenience transporting storing such large models coupled large capital expenditure required has motivated SAM 49Los Angeles andother West Coastchapters experiment Texaco first contest concept Taft CA Dec 5 1979 part 49ers Annual great deal interest generated Don Bekins winning 36 eleven ounce Thermal Thumber flying 12 minutes Among models being prepared SAM 30s March Texaco event Jack Altons Reduced Playboy Ted Kafers Ehling John Ponds Triangle Charley Critchs Dallaire As presently structured Texaco rather low pressure minimal rule fly-for-the-fun-of-it event current limit models must use Cox reed-valve engines Fuel quantity limited much fuel contestant can squeeze standard integral tank No limits have placed size weight area design eligible As could anticipated several further limi tations being considered West Coast chapters Among 8 ounce per square foot minimum weight Texaco-eligible designs Further experience will undoubtedly reveal other minor modifications needed fact remains however concept has proven workable challenging importantly enjoyable early work SAM 49 group would indicate need lightly built 36 t6 46 model powered either Black Widow QRC engine Weight build-up model size rapid critical ounce weight increase can represent 8% 10% gain However opportunity does exist utilize ones existing flight packs rather micro systems structural weight watched carefully Conversely 2 3 ounces saved dead weight does provide micro user latitude building mention improved ease installing small equipment rather crowded confines models own rather limited experiences hA Old Timers would indicate several potential problem areas precautions 2000 ft altitude area can render relatively large models very slow climb much sea level Im sure normal wind velocity area such consider 10 knots calm models tend drift Out sight very quickly presenting some need bright colors reflective mylar good vision Certainly challenging insurmountable problems Since current rules prohibit use Davis Diesel conversions Cox engines diesel could well add true fuel efficiency factor new event Surprisingly kit know suitable use Texaco RN models new Simplex Paul Plecan design Hobby Horn has kit Continued page 98 22 Model Aviation Ernie Payne builtthls plane tookine picture too Craft isa Lanzo Record Breaker built Hobby Horn plans Wing spans 50 power 04g Bob Sliff readies Simplex forflight isa RN Models kit spans 40 weighs 18 oz Ross holds 50 span Varsity Plane weighs 16 oz flew 10 mm first-ever /zA Texaco event SAM 49 Meet held Decem ber 121979 Taft CA Ernie Payne photo Doc Mathews Kioud King approaches Flight shot Bruce Mathews SR -71 reconnaissance 1 ale 240 45 engines 554 F9F5 PantherDynajetor Fan 355 P560 Sabre43 PS Crusader38 U2 Spyplane'103 PR6L Sabre UC Dynajet 37 P4J Phantom RC 1ropeller Driven P38 LightningRC 240-45 eng52 P-39 AiracobraRC 245-6051 P40 WarhaukRC 2 45-60 375 P828 Twin MustangRC 225-40 52 177 Cessna CardinalRC 60 engine725 F Make Glow Diesell From1hAtoY4ScalePower Usable Power Greater Economy I See AMA Bonus Benefit Coupons huge introductory discount dont forget stamped envelope J Davis Diesel Development Inc RC ScaIe/Wischers Continued page 61 Navajo will reCeive 20% added its flight score Ralph Jackson member winning 1974 US team entry Aerolympics World Championship Lakehurst NJ plane Ottawa will Windecker Eagle flew second place Sport Scale Lincoln Nats Harold Parenti prolific scale modelers competition always among top fin ishers everyone thought Bearcat would hard beat has elected build entirely new Mitsubishi Zero Its conventional retract landing gear will add 10% flight score Precision Scale FAI F4C team consists George Rose Bob Underwood Bbb Wischer George will use Curtiss Hawk P 6E has flown since 1977 Riverside Nats narrowly missed making 1978 team has polished flying technique Hawk get plane biplane tail wheel will give George additional 10% added flight score Georges extensive documentation Hawk result personal contact plane Daytons Air Force Museum Bob Underwood has built superior replace ment Sorrell Hiperbipe destroyed air show following Nats Lincoln hard see improvement could made hopes better flight perfortnance possibly diesel engine biplane conventional gear tailwheel Hiperbipe eligible 10% flight score bonus Bob Wisehers Piel Beryl becomes baCkup plane used event problems new Douglas A-20G attack bomber twin engine Douglas will feature retractable working oleo gear bomb drop Retracts two engines will add bonus 20% flight score would appear trend greater complexity has begun five six entries will take advantage additional bonuses offered Rib Stitching Examine wings tail surfaces fabric covered plane Note fabric held ribs cord stitching 1077$3250 4951450 471450 531450 5251450 3751250 5151450 381250 441250 31751250 3651250 551250 GET ORGANIZED Hen s set nI 4 shady lies hnIds 4 neWs ni vein taneijO 8 t t magazines 4 MAG FILES $495 Send 5495 pIns $100 in pealage tiaziethig DOM #WUSTRES PO BOX 388-K DOVER NH OSUC extends through wing bottom top surfaces Removing inspectionover enable viewing wing interior shows solid mass vertical cords plane would unsafe top surface lift transmitted structure through very thin strong cords Peeling fabric no longer problem some WW planes reputations coming apart Cord fed through wing during stitching long needle immediately adjacent rib crosses over rib upper surface back through wing lower surface knotted proceeds next loop along bottom Beneath cord stretched along rib surface narrow reinforcing tape approximately rib width Stitching complete wing covered pinked tape has serrated edges zig-zag pattern Fiberglass rib tapes have smooth edge pinking used planes covered Razorback fiber glass covering system Pinked tape models can made doping top bottom surfaces Jap tissue stretched over open frame dry tissue sheet cut scale width strips using serrated tearoff edge Reynolds aluminum foil box tearing pattern simulate pinked edge box edge needs backed up hardwood keep straight during cutting Stitching seen finished wing slightly raised elongated bump straddles rib right angles Degree visibility depends depth finish applied produce simulated stitching tape surface emboss tapes back surface dull screw driver pressing blade tape supported soft pine block impression remains Tape cemented wing centered over rib embossments protruding upward making tapes must kept mind number stitches doubled area wing subjected propeller slip stream Stitching used airfoil surfaces fuselage stringers embossing process can automated Using circular saw blade has no set its teeth roll blade down length tape moderate pressure avoid cutting through stitch impressions will result absolutely equal increments almost too perfect wooden slotted guide hold tape rolling blade helpful metal cutting blade proper tooth spacing model 1/6th size Visibility pinking serrations stitching varies depending upon depth finish applied have seen planes Grumman Gulfhawk comes mind have built-up filled finish almost obliterates detail serrations Stitching remains quite easily seen however Keep mind too wings bottom surface cord stretching between stitches visible line running parallel rib edge Bolt Dolly Wischer Ri 1 S-22lLapham Peak Rd Delafleld WI 53018 RC Old Timers/Mathews Continued page 22 plus plans 40 Lanzo illustrated photo Several designs originally intended Atom motor listed John Ponds catalog might prove satisfactory currently published Old Timer can locate 60% Westerner Model Builder 4-76 plan #4761 Surely others cant locate summary would appear Texaco will prove event strong appeal automobiles excess spendable incomes both shrinking face Arabs greed would predict rapid spread interest concept throughout modeling community long glorious life modernizedancient event Lets plan enjoy Tooting Hobby Horn Bob Slims Hobby Horn 112 Main Street Seal Beach CA 90740 veritable Cornucopia kits plans accessories Old Timer devotee com plete stock Schmidt P&W short kits R/N Micro Midway formerly Cal Aero full kits well Yates Orwick Y&O props available Accessories run Trexler wheels plans Bowden Mouse Send dollar illustrated catalog its mind boggling MAM Karl Spielmaker Bob Pattison Joe Kresnak organizing Michigan Antique Modelers Club plan hold several contests Hastings Three Rivers area summer invite interest Old Timers antiques rubber OT contact will publish bi-monthly newsletter swap sheet Interested parties should contact Karl Spielmaker 4690 Burlingame 5 W Wyoming MI 49509 SAM Society Antique Modelers 1980 dues now due have renewed would like join advised dues will increase 51000 after June 11980 plan live another 7 years Life Membership $7500 could represent bargain well hedge against inflation 1981 rules proposals distributed vote Jan-Feb issue SAM Speaks long interesting list changes additions presented free flight section will affect RC OT Proposal #8 allow diesel engines manufactured before 1950 compete original spark ignition engines would inappropriate comment free flight proposals cannot resist noting problem will arise #8 accepted engine committee will have rule whether Indian Mills 075 13 engines Indy R/C importing eligible Either way converted-to-diesel units Bob Davis will still allowed pity really 98 Model Aviation NEW Ducted Fan RC Scale Plans wispanlength price Plans Full Size Working Plans Prices subject $150 first-class postage pay check allow 10 days Send check money order RALPH SALDI VAR 1608 LANDES Ct MODESTO CA 95350 USA Shielding spark ignition Steve Auman Jena LA Process Engineer Beldon Corp maker automotive ignition wire suggests Beldon IRS ignition cable amethodof control ling radio frequency RF interference running spark ignition engine RC says wire has 10000 ohms resistance per foot shield suppress ignition noises auto radios should produce similar effect resistor high tension wire editor Bill Winter mentioned earlier Ive tried Im playing new transistorized ignition system TIS will report two months hence However anyone has experience type c able would please share experience us Im subject RE interference problems Fred Collins reminded developed shielded ignition system box featured Model Builders March 1974 issue rejected time beyond limited electronic knowledge however Fred advises needed components available Radio Shack stores minimal skills needed fabricate reader interested Freds system cannot obtain copy magazine article send large SASE copy schematic Fred says avoid metal pushrods throttle mount -watt resistor top ignition coil avoid breakage An article Charles Kenney February 1975 issue ModelAirplane News described similar shield ed ignition system utilizing rechargeable nicad battery Need mounting bracket Eli7 Yes such exotic accessories Morton M/5 Distri butor rotors fuel tank reproductions old time engines available Fred Collins 29 Stewart Avenue Pittsburgh PA 15227 Send SASE Fred list details Goodyear blimps beware Bill Effinger Berkeley Models interesting flights 1936 original Buccaneer Lakehurst NAS flew dirigible Los Angeles moored time fortunately ripped 30 feet its fabric next flight Buccaneer went cranberry bog went looking got lost tracked Out another Navy blimp About week later blimp located model Well least couldnt have too upset Bill recently retired Atlanta back modeling mood bunch interesting projects underway Could red white kit boxes coming back Dee B Mathews 506 S Walnut Greensburg KS 67054 * roam cure ana aaaa ukmna w * Machine cut selected balsa ply * * Attractive molded canopy * * 5132 dia preformed gear * * Complete hardware package * * Rolled full size p lan Isometrics * / Illustrated stepbystep Instructions * F-. An aircraft style grace beautiful V tailed machine designed Sunday sport flyer Du Bra Mixer controls tail surfaces performance outstanding Like sister-ship Executive structure mostly balsa 114 siding absorbs rigors active practice Youll like way parts fit Its good kit value real performer beautiful bird fly DEALER INQUIRIES INVITED kept stock Heliboy helicopters enough distance between rotor tail boom prevent tail boom strike Inverted flying can cause blades come close striking distance under some circum stances instance change positive pitch full negative pitch high blade rpm holding rear awash plate command could cause strike since blade will over bite Similarly strike might occur blade speed down hard rear awash plate command given since may suffici ent centrifugal force keep blades flexing boom Throttle collective throttle will have equipped either throttle hold throttle governor throttle hold set-up means 5th servo micro switch opens circuit throttle servo thereby locking servo throttle position desired approx Y open though collective changes can made assume micro switch actuated cam collective servo output arm DRC governor offers advantage nearconstant blade speeds collective pitch passes through zero degrees pitch An electronic governor developed few years ago Al Erwin also requires fifth servo Tach-Tron may still available chose throttle hold set-up fly inverted Heliboy youll need approximately 16 degrees total collective pitch travel half stick transmitter should have zero degrees pitch Movement stick forward should give approximately 8 degrees positive pitch movement stick full back should give approximately 8 degrees negative must modify pitch change wire rebending limited plastic follower Helicopters other Heliboy may need similar modifications general inverted flying requires increasing total collective pitch required plus addition fifth servo Tail rotor mixer tail rotor mixer modification may beneficial sinceideally tail rotor mix should give compensation whether main rotor pitch changing positive pitch nega tive pitch dont use tail rotor compensator ships because dont fly spring-centered stick like pilots anyway Theres really no center trim position flying helicopter aware instant collective pitch passes through negative back through positive pitch tail rotor must attended order compensate torque changes Remember now torque both positive negative settings since engine deliver ing power blades Transmitter reversing switches have used transmitter reversing switches inverted flying Continued page 23 explained example broom being suspended its handle attempting support broom upright its handle balanc ing broom hand Unlike suspended broom strong inputs required displace broom its vertical position supported broom requires strong inputs return broom vertical position further vertical power required return helicopter tendency fuselage return its natural position suspended beneath rotor just pendulum broom will return its vertical position am still doing lot testing because have answered questions about inverted flight can done few tips follow Helicopter markings problems inverted flight retraining yourself observe helicopter different manner usual vtsual clues no longer apply usually watch skids rotor disc flying inverted rotor disc seems disappear skid usually sight Youll have acquire new approach looking machine especially inverted turns steep banking left hand turn appears steep right hand turn Nose up maneuvers such stall turns will also upset judgement since again visual clues misleading photographs show mark rngs use reinforce other visual references machine inverted Fuel tank engine adjustment fuel tank must modified inverted flight otherwise youll pouring fuel over flying field Im using dual-vented tank center pick up Youll need install vent top other bottom Both vents must fitted stiff length fuel tubing bottom vents top tank vice versa fuel pick-up done normal manner sure install filter complete tank modification fill halfway invert tank should no binding pick-up tube Remember cant land adjust needle youre inverted Another important point needle valve adjustment ship inverted entire tank higher needle valve causing engine run very rich inverted Care must used adjusting needle valve want engine slightly leaner used running does mean lean means nor rich Perhaps Robart Automix pumper would valuable DRC Coning angle main rotor coning angle June 1980 99 RC Helicopters/Chesney