MIDWEST CL Models Great beginning controlline flier fun sport new series Goodyear Rac ersisstyledafterfull-size Formula aircraft also eligible AMA Scale Racer Class competi tion Kits complete including decals supply en gine paint \\ inwmu PRODUCTS CO M 400 Soutti Indiana St Hobart Indiana 46342 Letters Editor letters will carefully considered general interest used Send ModelAviation 815 15th St NW Washington DC 20005 Matching Pitch Operating Conditions very simple get rough idea propeller pitch required match particular velocity/rpm situation Take velocity airplane inches divide revolutions prop per second result will give required pitch inches diameter prop set driving face prop zero degrees angle attack Add couple degrees angle attack along blade elements will very close ideal pitch operating condition would examine Kit Bays Aug 1978 Letters conclusions regarding pitch/ velocity/rpm will find method described above giving identical values pitch However wrong assume once propeller begins operate its blade elements negative angle tack means acting air brake governing factor actual zero lift anglenot con fused term zero angle attack What kind rpm/prop combination would need use wanted soupup Austrian speed glider hit 300 mph 300 mph 5280 sec 333 416 500 583 666 Looking results above seems bind Because limitation diameter keep tip speed 950 per sec ond pitch/diameter ratio very high too high maximum efficiency occur ring value around 11 Decreasing required pitch increasing rpm doesnt help since shrinking diameter keeps ratio same looks like will take lot brute horsepower driving very inefficient prop propeller design requirements will look weird Because extreme blade angles blade area should concentrated towards tip pitch should non-helical same reason pitch increasing towards tip having its highest value near radius 70% posi tion high tip speed calls very very thin airfoils outer half blade should around 5%/6% thick tip would some arguments going three- four-bladed propeller Whatever number blades props would have fabricated using epoxy/ graphite/carbon promise never again get hooked RC subject point Im tempted write letters t things know nothing about Im disappearing forever favorite FAI Power model Bill Gieskieng Jr Denver CO Free Flight Famine fourth consecutive month Model viat ion has failed present con struction articles free flight models would writing letter MA independent publication magazine represented Official Publication Academy Model Aeronautics numerous model airplanes magazines cater terests radio-control modelers would hope Academys publication would try represent its members As things exist now four 4 monthly sec tions dedicated Control Line six 6 features about Radio Control including Oldtimers deals much radio control matters free flight two 2 sections free flight Maximum Diam 109 872 726 622 545 P/D Ratio 145 145 145 145 145 find difficult believe excellent free flight competition mod elers around cannot obtain worthy subjects publication feel its time AMA stopped con sidering free flights second rate mem bers started giving us much consideration other aspects hobby Joel Chesler Malverne Park NY Model Aviation often carpet alleged undercoverage event Radio people say dont give com parable material quantity other mag azinesbut some cases Control-Line people sometimes say exactly what Joel just said Free Flight MA has four free flight columnists two Warner Sport/Scale Meuser Duration Haught Oldtimers Tenny Indoor As old free fighter editor conscious weak coverage Powered Free Flightthough Meuser constantly presenting inside poop 36 Model Aviation Plumb CrazyKit No 254 Miss San BernardinoKit No 255 20K 1585 pitch 25K 30K 35K 40K Lii QuickieKit No 257 views good design can lay hands want publish power FF cannot present FA jobs lack interest plans bomb long period MA FF has perceived everyone stagnant witnes sing trend gadgetryala FAIand have assignments out top notch AMA job Class C worlds greatest FA jobs little point running string look-alike uninspir ing Half Half Class con ver sions Weve number does go Free fighters talk among themselves rarely submit design will undertake magazine task editor interested dogs non-powered segment FF different matterweve able publish va riety excellent airplanes Excellence key Does anyone have design truly worth publishing Incidentally far west digs bigger free flights wearies publishing diet Half OK free fightersits ship instructor used say Wheel Landings Re Lee Taylors article Art Thinking Big Julys magazinegen erally excellent article must take exception technique making wheel landings proper technique full-scale aircraft make normal flare except allow wheels touch before stall soon touch push stick forward before push stick forward airplane still flight nose will go down airspeed will build up youve got potential crash think technique applies equally well case either 1/4 scale full-scale aircraft just test flew new Lazy Ace used wheel landing have described worked per fectlyno scary stall rest Lee Taylors instructions OKas speed drops off come back stick avoid nosing over Lets see e models Keep Fox Fuel Line Models Life Blood Passes Through Simple Piece Fuel Line Surely Want Best As engine manufacturers acutely aware large portion called engine problems reality fuel line problems Symptoms fuel line trouble going lean air leaks speed fluctuations inability get rich enough high speed restricted flow Fox Fuel Lines best materials available physical proper ties selected model use Fox Fuel Lines worlds finest Tuft Line Silicone far strongest market semitransparent shows bubbles line heat resis tant Like silicone tubing tends slip oft fittings unless care taken Neoprene Actually complex compound much elastic clings fittings main disadvan tage transparent Surgical Tubing Pure Rubber Very flexible Use sharp bends necessary Semi-transparent Shows bubbles line Holds fittings well Main disadvantage tends deteriorate rapidly silicone neoprene Plastic good anybodys dont think much plastic fuel line Advantage low price transparency Disadvantage- tends collapse bends hardens age heat Tends leak air fittings after ITEM FUEL LINEPRICEITEM FUEL LINEPIUCE 86880 Small Neoprene2 Pog.5086885 Small Clear Plastic2 Pkg.25 86881 Medium Neoprene2 Plg.6086886 Medium Clear Plastic2/ Pbg.30 86882 Large Neoprene2 Pkg.7086887 Large Clear Plastic2 Pkg.40 86883 Small Tuft Line1 Pkg . 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 PRg70g68g9 Med Surgical Tubing2 Pkg.50 86851 Large Tuft Line1 Pkg10086890 Large Surgical Tubing2 Pkg.60 FOX MANUFACTURING Fox Model Airplane Products 5305 Towson Smith Arkansas 72901 e 501-646-1656 Answer 1o-Channel Dilemma NIMBUS 2-channel radio system offers American engineering import prices Features include. 1 Solid State superheterodyne 2 All Silicon transistor receiver circuit highly Selective front end 3 RF amplifier maximum signal noise ratio unexcelled selectivity 4 2 ultra small EK SM servos greater 4 pounds output thrust S Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticks full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program p 1977 EK-Proaucts Inc 779 EK-Products . . ober1978 7 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NATIONALS USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 Better quality control better selection hard maple wood 3 The best finish completelyfuelproof New Improved 1918 SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 634e9 733/.4iia 533% 45e 129 8%77%139 94565% 77%139 104567149 10SW 8W149 10SEW159 114677% 7A7%5159 11SEWiee 11%67169 125179 12SW179 1356239 145 6279 1556349 ie4%e449 17se599 15se599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES up good work Doug Mac Brien Granby MA About Quickie Regarding Quickie controversy opening letter Letters Editor August Model viation points up diverse interests model aviation Whereas Quickie article Don Ber liner did appeal Mr Walter Wirths turned completely would think Model Aviation magazine doing its civic duty modelers presenting indepth articles 3-views exciting new designs no plans kits available As know built Quickie V4 scale Berliner article supplemented information kit Quickie Enter prises information kit included CG location real aircraft did rely entirely because scaling fac tors built several gliders rubber ver sions Quickie establish better CG information also important decalage some refinement CG decalage 1/4 scale model now flies fine will submit construction article consideration Workable CGs 50% between root quarter-chords gliders 40% aft foreplane quarter-chord peanut V4 scale RC versions numbers will get air As important though decalage angles between wing foreplane chords must healthy 5 degrees John Hunton Annandale VA Regulations Big Models noticed Openers editorial July issue Model Aviation certainly relieved finally see word two warning big RC models am very much concerned about models can safely operated thought pylon racing 16 lb airplanes frankly appalling believe AMA should immediately initiate detailed investigation deter monsters can safely flown under same conditions procedures have used successfully smaller models very least must have absolute weight power restric tions will limit kinetic energy de veloped flight So far large designs appear floaters Everyone knows however Quadra engine can produce 5 hp mild rework dose nitro its matter time until 20-lb mod els capable very high speeds energy release impact such missiles could readily calculated effect direct hit another flier bystander difficult evaluate obvious however risk serious injury worse such collision sufficient warrant very careful consideration AMA Please review question publish additional information comment subject becomes available Glenn F Gresens Baton Rouge LA matter under study feeling seems would better govern ourselves big models create situation could lead FAA determining should impose re strictions Further information will printed MA becomes available Reply Gieskieng should realized great deal information given propeller articles has gleaned just plain engineering data theory applied propellers general As stated original article has very little research done propellers models scientific manner objec tive articles show modelers what areas research could done hope improving breed per sonally have doing some research feel have scratched surface fact recent work dicates may very well true diameter Formula propeller can increased 8 full 10 have new prop competitive race something good has obviously found next objective would take advantage findings develop full potential appears realistic point say much can gained through propeller research points Bill has brought out valid can make worthy addi tions what has already presented point prop pitch relative zero lift angle various airfoils problems encountered delving something well established pro pellers able describe relate design manner familiar average modeler people confused what say understand work wasted can bit difficult consider ramifications pitch propellers number reasons has always measured back side blade stated inches Inasmuch airfoils used have very flat bottom has good reference point thrust pro peller created lift airfoil windmill effect leverage rear side blade Bill suggests should measure pitch zero lift angle airfoil rather what back blade customary would help applying theory comparisons made between various Continued page 86 8 Model Aviation THE LEADER IN COM PETITION PROPELLERS WINNERS HAVE RC PYLON RACING DIAPITCHPRICE 53%4 129 756 149 7SN SN 1A9 5%6% 6% 7 7%7%159 977% 7%159 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 755%149 7 7%10%11169 5 59159 S aN 9%%159 9 1213229 N NARROW knocked angry hound reached out through burlap bag sunk teeth Walts ankle ther ship returned after 12 years day its last flight hunter found itwhile searched weeksand sold guy town 35 miles away modeler guy found out fly itwhich did years Good Broth ers receiver bought old back issue magazine found picture airplane thing led another two maga zines removed offered back yesterdays dream ship settled historic receiver now Beam come back haunt us built 1958 lost once 1960 landed Grummans parking lota seagull thought watchman Beam given Norm Ro senstock flying buddies know sometimes does unexpected So flew little Beam 1966 untilbut cant set epitaph date now preserve memories good old days Lost Airplane Ground Check Interfer ence did change Found sign name non-existent ad dress ancient phone number got wrapped up explaining Beam disbelieving spectator forgot turn switch custom perseveres some quarters very day Enter cabin cruiser Good Samaritan skipper phone call puzzled Informa tion letter shown postman old neighbor presently made its way Virginia So airplane found What airplane thought Norm shorten hairy dog story include new picture Norm Beam Its full wicked warps says mention front because Beam doesnt know Still flies great euphoric days Lost Airplane Ground Check Interference still live What favorite airplane thousands subjects choose modelers seized least once overwhelming urge transform some particular aircraft dreamship project does assess par ticular design above others Beautiful lines uniqueness torical background Spitfire un touched its grace symmetry line R J Mitchell its designer already put incomparable touch Supermarme Schneider Trophy racers died before saw airplane Spitfire save country Mus tang symphony inspired engineer ing probably best its kind jaunty SE-5 typifies spirit WW later-day biplane Like ever-popular Curtiss Hawk its glor iously tapered staggered wings pugnacious Laird Super Solution racer Connie its impressively cowled engines circular cross section Lock heed-Lightning planformed wing Tn-Star among Jumbos perhaps screen flashed long series slides living color depicted civil military types big fly-in Thomas Morse Concorde homebuilts pair Republic Thuds commentary ran suddenly P-38 head silver against blue sky Silence room broke sustained ap plause Gentlemen give Lightning Letters Editor continued page 8 types airfoils However what else has considered thrust comes airfoil also windmill effect So actual pitch would angle back side would true lift angle airfoil instead would compromise two So would appear what have con sider descriptive number use differentiate between var ious propellers call pitch would better called model number practice used comparative purposes work remain comparable norm too must follow procedure though may theoretically correct interesting learn NACA done some work stream lined airfoils propellersapparently using same reasoning suggested prop articles good know seen improvement through use some sort symmetrical type airfoil Bills info Yes true some racing props reach 27K air also true explained article may very good practice due reaching speed range compressi bility probably number areas can explored find improvements along line such multi-bladed props Unfortunately competition purposes sort thing usually worked out restricted 2-bladed props practical reason work would have done other areas Sug gestions would use high-speed airfoils and/or sweepback portion blade subjected Mach speeds As prop production portion article indicated use templates prop blocks will put ballpark pitch blade widths Obviously final finishing should done some sort pitch gauge have pitch gauge instrument obviously use ful otherwise suggestion making template angles station will work well also also interesting know NACA done some work loca tion maximum blade width found some improvement using 38% product review product review product review 86 Model Aviation ultimate finishVW kote ciear S/p liquid goes over favorite paint & produces high gloss finish remarkably fuel resistant coat No mixing No short pot life Also fantastic Coverite COVERITE 2779 PHILMONT AVE HUNTINGOON VALLEY PA Norm Rosenstock Beam product review product review product review Glaskote Clear liquid goes over painted surface high-gloss fuel-resistant finish Flows like butter leaving no brush marks Mixing required no two parts no short pot life High percentage solids allows coat Dries quickly yet levels well Half-pint cans Coverite 2779 Philmont Ave Huntingdon Valley PA 19006 previous data indicated 60 66% ideal NACA data would indicate some work blade width location might bear some fruit Something else try hope readers will see letter has added worth what previously offered way pooled knowledge can make investigation easier interesting part believe recent prop work has discovered basis what could super prop Formula racing least results drastic change have very surprising enlightening Should dear editor see fit per haps will able pass findings along near future Harold deBolt Buffalo NY Mr deBolts letter responds earlier letter Bill Gieskienghe has seen Bills letter months column dear editor waffling won ders f world ready Harolds lat est findings unloading figures unbelievablediference between onground in-flight rpm ed also terrjfied sharpie Pylon guys sailplane designers wodld feel better some positive Pylon guys would try some deBolts earlier article revelations about itshould carry RC Technique/Myers continued page 16 item really wise treat care lessl Having stated problem its time suggest some solutions 1 Park shade 2 Cover windows keep out sunlight problem Greenhouse Effect Sunlight passes through glass heat interior car heated interior tries radiate its excess heat back out window cant because radiant energy frequency associated 60 -3 d U 1-50 -J 0 0 0 40 0 FE low temperature interior car much lower frequency sunlight glass black lower frequencies So heat stays car collects raising temperature convenient way dispose open windows let hot air carry away 3 If cant above perhaps can take batteries build ing Keeping cool objective 4 Failing should least test batteries before first flight 102030 DISCHARGE TIME IN MINUTES AVG 500 ma LOAD 40 50 Fig 6 Shows results testing several battery packs under various environmental conditions Name Address ______________Cly.........Slalo......Zp after flight Several manufacturers now offering built-in battery testers part transmitter Fig 4 shows Kraft Signature transmitter being used test batteries Quickee 500 Fig 5 shows Bridi expanded-scale voltmeter performing same service Similar ESM available Royal Electronics Craft Air EKLogictrol others devices place load battery simulates load operating system can use operating system load use LED low-voltage detectors such Power-Cyt Flite Lite Corleys CVI discussed column length January April issues 1976 What ever use test dont guess test let load hang batteries least 30 seconds may find voltage drops quite rapidly danger zone Batteries recuperate little get chance rest flash reading may very well wrong Since correct information best defense might want run few bat tery discharge tests Now dont believe discharging battery way down time recommended some battery discharge/time tester manu facturers does use up some life battery think test purpose establishing baseline condition good idea test what have may find some thing like Fig 6 Surprise battery October1978 87 Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple conSTERLING MODELS 0 ST PHILA PA 19134 Co dealet anarlablo dIrect Orders accepted tO oddrtoAal atruction Balsa Plywood parts accurately cOarge trandling shIpping 500 orinormon 0 US Sr 25 diecut precision vacuum formed Plastic hull andootsrde US - - Catalog entIre roe Ct arrplane corrrtot roe model kIts 0 C ocare cabin Hardware package including A/C hardware Full and Trainer kIts Seat model kIts accessorres etc 500 errcinosed sized Plans plus Decals Sport model coast- Secrets Model AIrplane Surldrog IncludIng desIgn OOnstroctlOn cooerlng trotstring trying adlustinog coorroin systems etc 250 Guard versionO Secret ot Contol Line Catrine Flying Inclodtng ytotlrgttt soloIng stunting Cartter rote ants regolatrons Carrine ttereg trrnts cootot line tostallatino rostroctrOns 250 enclosed Noottecks Only U S money Orders currency accepted O-NEWCELL700F NEW CELL 7O0FAFTER 2 DAYS IN CAR USED CELL 1300F AFTER 2 DAYS IN CAR
Edition: Model Aviation - 1978/10
Page Numbers: 6, 7, 8, 86, 87
MIDWEST CL Models Great beginning controlline flier fun sport new series Goodyear Rac ersisstyledafterfull-size Formula aircraft also eligible AMA Scale Racer Class competi tion Kits complete including decals supply en gine paint \\ inwmu PRODUCTS CO M 400 Soutti Indiana St Hobart Indiana 46342 Letters Editor letters will carefully considered general interest used Send ModelAviation 815 15th St NW Washington DC 20005 Matching Pitch Operating Conditions very simple get rough idea propeller pitch required match particular velocity/rpm situation Take velocity airplane inches divide revolutions prop per second result will give required pitch inches diameter prop set driving face prop zero degrees angle attack Add couple degrees angle attack along blade elements will very close ideal pitch operating condition would examine Kit Bays Aug 1978 Letters conclusions regarding pitch/ velocity/rpm will find method described above giving identical values pitch However wrong assume once propeller begins operate its blade elements negative angle tack means acting air brake governing factor actual zero lift anglenot con fused term zero angle attack What kind rpm/prop combination would need use wanted soupup Austrian speed glider hit 300 mph 300 mph 5280 sec 333 416 500 583 666 Looking results above seems bind Because limitation diameter keep tip speed 950 per sec ond pitch/diameter ratio very high too high maximum efficiency occur ring value around 11 Decreasing required pitch increasing rpm doesnt help since shrinking diameter keeps ratio same looks like will take lot brute horsepower driving very inefficient prop propeller design requirements will look weird Because extreme blade angles blade area should concentrated towards tip pitch should non-helical same reason pitch increasing towards tip having its highest value near radius 70% posi tion high tip speed calls very very thin airfoils outer half blade should around 5%/6% thick tip would some arguments going three- four-bladed propeller Whatever number blades props would have fabricated using epoxy/ graphite/carbon promise never again get hooked RC subject point Im tempted write letters t things know nothing about Im disappearing forever favorite FAI Power model Bill Gieskieng Jr Denver CO Free Flight Famine fourth consecutive month Model viat ion has failed present con struction articles free flight models would writing letter MA independent publication magazine represented Official Publication Academy Model Aeronautics numerous model airplanes magazines cater terests radio-control modelers would hope Academys publication would try represent its members As things exist now four 4 monthly sec tions dedicated Control Line six 6 features about Radio Control including Oldtimers deals much radio control matters free flight two 2 sections free flight Maximum Diam 109 872 726 622 545 P/D Ratio 145 145 145 145 145 find difficult believe excellent free flight competition mod elers around cannot obtain worthy subjects publication feel its time AMA stopped con sidering free flights second rate mem bers started giving us much consideration other aspects hobby Joel Chesler Malverne Park NY Model Aviation often carpet alleged undercoverage event Radio people say dont give com parable material quantity other mag azinesbut some cases Control-Line people sometimes say exactly what Joel just said Free Flight MA has four free flight columnists two Warner Sport/Scale Meuser Duration Haught Oldtimers Tenny Indoor As old free fighter editor conscious weak coverage Powered Free Flightthough Meuser constantly presenting inside poop 36 Model Aviation Plumb CrazyKit No 254 Miss San BernardinoKit No 255 20K 1585 pitch 25K 30K 35K 40K Lii QuickieKit No 257 views good design can lay hands want publish power FF cannot present FA jobs lack interest plans bomb long period MA FF has perceived everyone stagnant witnes sing trend gadgetryala FAIand have assignments out top notch AMA job Class C worlds greatest FA jobs little point running string look-alike uninspir ing Half Half Class con ver sions Weve number does go Free fighters talk among themselves rarely submit design will undertake magazine task editor interested dogs non-powered segment FF different matterweve able publish va riety excellent airplanes Excellence key Does anyone have design truly worth publishing Incidentally far west digs bigger free flights wearies publishing diet Half OK free fightersits ship instructor used say Wheel Landings Re Lee Taylors article Art Thinking Big Julys magazinegen erally excellent article must take exception technique making wheel landings proper technique full-scale aircraft make normal flare except allow wheels touch before stall soon touch push stick forward before push stick forward airplane still flight nose will go down airspeed will build up youve got potential crash think technique applies equally well case either 1/4 scale full-scale aircraft just test flew new Lazy Ace used wheel landing have described worked per fectlyno scary stall rest Lee Taylors instructions OKas speed drops off come back stick avoid nosing over Lets see e models Keep Fox Fuel Line Models Life Blood Passes Through Simple Piece Fuel Line Surely Want Best As engine manufacturers acutely aware large portion called engine problems reality fuel line problems Symptoms fuel line trouble going lean air leaks speed fluctuations inability get rich enough high speed restricted flow Fox Fuel Lines best materials available physical proper ties selected model use Fox Fuel Lines worlds finest Tuft Line Silicone far strongest market semitransparent shows bubbles line heat resis tant Like silicone tubing tends slip oft fittings unless care taken Neoprene Actually complex compound much elastic clings fittings main disadvan tage transparent Surgical Tubing Pure Rubber Very flexible Use sharp bends necessary Semi-transparent Shows bubbles line Holds fittings well Main disadvantage tends deteriorate rapidly silicone neoprene Plastic good anybodys dont think much plastic fuel line Advantage low price transparency Disadvantage- tends collapse bends hardens age heat Tends leak air fittings after ITEM FUEL LINEPRICEITEM FUEL LINEPIUCE 86880 Small Neoprene2 Pog.5086885 Small Clear Plastic2 Pkg.25 86881 Medium Neoprene2 Plg.6086886 Medium Clear Plastic2/ Pbg.30 86882 Large Neoprene2 Pkg.7086887 Large Clear Plastic2 Pkg.40 86883 Small Tuft Line1 Pkg . 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 PRg70g68g9 Med Surgical Tubing2 Pkg.50 86851 Large Tuft Line1 Pkg10086890 Large Surgical Tubing2 Pkg.60 FOX MANUFACTURING Fox Model Airplane Products 5305 Towson Smith Arkansas 72901 e 501-646-1656 Answer 1o-Channel Dilemma NIMBUS 2-channel radio system offers American engineering import prices Features include. 1 Solid State superheterodyne 2 All Silicon transistor receiver circuit highly Selective front end 3 RF amplifier maximum signal noise ratio unexcelled selectivity 4 2 ultra small EK SM servos greater 4 pounds output thrust S Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticks full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program p 1977 EK-Proaucts Inc 779 EK-Products . . ober1978 7 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NATIONALS USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 Better quality control better selection hard maple wood 3 The best finish completelyfuelproof New Improved 1918 SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 634e9 733/.4iia 533% 45e 129 8%77%139 94565% 77%139 104567149 10SW 8W149 10SEW159 114677% 7A7%5159 11SEWiee 11%67169 125179 12SW179 1356239 145 6279 1556349 ie4%e449 17se599 15se599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES up good work Doug Mac Brien Granby MA About Quickie Regarding Quickie controversy opening letter Letters Editor August Model viation points up diverse interests model aviation Whereas Quickie article Don Ber liner did appeal Mr Walter Wirths turned completely would think Model Aviation magazine doing its civic duty modelers presenting indepth articles 3-views exciting new designs no plans kits available As know built Quickie V4 scale Berliner article supplemented information kit Quickie Enter prises information kit included CG location real aircraft did rely entirely because scaling fac tors built several gliders rubber ver sions Quickie establish better CG information also important decalage some refinement CG decalage 1/4 scale model now flies fine will submit construction article consideration Workable CGs 50% between root quarter-chords gliders 40% aft foreplane quarter-chord peanut V4 scale RC versions numbers will get air As important though decalage angles between wing foreplane chords must healthy 5 degrees John Hunton Annandale VA Regulations Big Models noticed Openers editorial July issue Model Aviation certainly relieved finally see word two warning big RC models am very much concerned about models can safely operated thought pylon racing 16 lb airplanes frankly appalling believe AMA should immediately initiate detailed investigation deter monsters can safely flown under same conditions procedures have used successfully smaller models very least must have absolute weight power restric tions will limit kinetic energy de veloped flight So far large designs appear floaters Everyone knows however Quadra engine can produce 5 hp mild rework dose nitro its matter time until 20-lb mod els capable very high speeds energy release impact such missiles could readily calculated effect direct hit another flier bystander difficult evaluate obvious however risk serious injury worse such collision sufficient warrant very careful consideration AMA Please review question publish additional information comment subject becomes available Glenn F Gresens Baton Rouge LA matter under study feeling seems would better govern ourselves big models create situation could lead FAA determining should impose re strictions Further information will printed MA becomes available Reply Gieskieng should realized great deal information given propeller articles has gleaned just plain engineering data theory applied propellers general As stated original article has very little research done propellers models scientific manner objec tive articles show modelers what areas research could done hope improving breed per sonally have doing some research feel have scratched surface fact recent work dicates may very well true diameter Formula propeller can increased 8 full 10 have new prop competitive race something good has obviously found next objective would take advantage findings develop full potential appears realistic point say much can gained through propeller research points Bill has brought out valid can make worthy addi tions what has already presented point prop pitch relative zero lift angle various airfoils problems encountered delving something well established pro pellers able describe relate design manner familiar average modeler people confused what say understand work wasted can bit difficult consider ramifications pitch propellers number reasons has always measured back side blade stated inches Inasmuch airfoils used have very flat bottom has good reference point thrust pro peller created lift airfoil windmill effect leverage rear side blade Bill suggests should measure pitch zero lift angle airfoil rather what back blade customary would help applying theory comparisons made between various Continued page 86 8 Model Aviation THE LEADER IN COM PETITION PROPELLERS WINNERS HAVE RC PYLON RACING DIAPITCHPRICE 53%4 129 756 149 7SN SN 1A9 5%6% 6% 7 7%7%159 977% 7%159 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 755%149 7 7%10%11169 5 59159 S aN 9%%159 9 1213229 N NARROW knocked angry hound reached out through burlap bag sunk teeth Walts ankle ther ship returned after 12 years day its last flight hunter found itwhile searched weeksand sold guy town 35 miles away modeler guy found out fly itwhich did years Good Broth ers receiver bought old back issue magazine found picture airplane thing led another two maga zines removed offered back yesterdays dream ship settled historic receiver now Beam come back haunt us built 1958 lost once 1960 landed Grummans parking lota seagull thought watchman Beam given Norm Ro senstock flying buddies know sometimes does unexpected So flew little Beam 1966 untilbut cant set epitaph date now preserve memories good old days Lost Airplane Ground Check Interfer ence did change Found sign name non-existent ad dress ancient phone number got wrapped up explaining Beam disbelieving spectator forgot turn switch custom perseveres some quarters very day Enter cabin cruiser Good Samaritan skipper phone call puzzled Informa tion letter shown postman old neighbor presently made its way Virginia So airplane found What airplane thought Norm shorten hairy dog story include new picture Norm Beam Its full wicked warps says mention front because Beam doesnt know Still flies great euphoric days Lost Airplane Ground Check Interference still live What favorite airplane thousands subjects choose modelers seized least once overwhelming urge transform some particular aircraft dreamship project does assess par ticular design above others Beautiful lines uniqueness torical background Spitfire un touched its grace symmetry line R J Mitchell its designer already put incomparable touch Supermarme Schneider Trophy racers died before saw airplane Spitfire save country Mus tang symphony inspired engineer ing probably best its kind jaunty SE-5 typifies spirit WW later-day biplane Like ever-popular Curtiss Hawk its glor iously tapered staggered wings pugnacious Laird Super Solution racer Connie its impressively cowled engines circular cross section Lock heed-Lightning planformed wing Tn-Star among Jumbos perhaps screen flashed long series slides living color depicted civil military types big fly-in Thomas Morse Concorde homebuilts pair Republic Thuds commentary ran suddenly P-38 head silver against blue sky Silence room broke sustained ap plause Gentlemen give Lightning Letters Editor continued page 8 types airfoils However what else has considered thrust comes airfoil also windmill effect So actual pitch would angle back side would true lift angle airfoil instead would compromise two So would appear what have con sider descriptive number use differentiate between var ious propellers call pitch would better called model number practice used comparative purposes work remain comparable norm too must follow procedure though may theoretically correct interesting learn NACA done some work stream lined airfoils propellersapparently using same reasoning suggested prop articles good know seen improvement through use some sort symmetrical type airfoil Bills info Yes true some racing props reach 27K air also true explained article may very good practice due reaching speed range compressi bility probably number areas can explored find improvements along line such multi-bladed props Unfortunately competition purposes sort thing usually worked out restricted 2-bladed props practical reason work would have done other areas Sug gestions would use high-speed airfoils and/or sweepback portion blade subjected Mach speeds As prop production portion article indicated use templates prop blocks will put ballpark pitch blade widths Obviously final finishing should done some sort pitch gauge have pitch gauge instrument obviously use ful otherwise suggestion making template angles station will work well also also interesting know NACA done some work loca tion maximum blade width found some improvement using 38% product review product review product review 86 Model Aviation ultimate finishVW kote ciear S/p liquid goes over favorite paint & produces high gloss finish remarkably fuel resistant coat No mixing No short pot life Also fantastic Coverite COVERITE 2779 PHILMONT AVE HUNTINGOON VALLEY PA Norm Rosenstock Beam product review product review product review Glaskote Clear liquid goes over painted surface high-gloss fuel-resistant finish Flows like butter leaving no brush marks Mixing required no two parts no short pot life High percentage solids allows coat Dries quickly yet levels well Half-pint cans Coverite 2779 Philmont Ave Huntingdon Valley PA 19006 previous data indicated 60 66% ideal NACA data would indicate some work blade width location might bear some fruit Something else try hope readers will see letter has added worth what previously offered way pooled knowledge can make investigation easier interesting part believe recent prop work has discovered basis what could super prop Formula racing least results drastic change have very surprising enlightening Should dear editor see fit per haps will able pass findings along near future Harold deBolt Buffalo NY Mr deBolts letter responds earlier letter Bill Gieskienghe has seen Bills letter months column dear editor waffling won ders f world ready Harolds lat est findings unloading figures unbelievablediference between onground in-flight rpm ed also terrjfied sharpie Pylon guys sailplane designers wodld feel better some positive Pylon guys would try some deBolts earlier article revelations about itshould carry RC Technique/Myers continued page 16 item really wise treat care lessl Having stated problem its time suggest some solutions 1 Park shade 2 Cover windows keep out sunlight problem Greenhouse Effect Sunlight passes through glass heat interior car heated interior tries radiate its excess heat back out window cant because radiant energy frequency associated 60 -3 d U 1-50 -J 0 0 0 40 0 FE low temperature interior car much lower frequency sunlight glass black lower frequencies So heat stays car collects raising temperature convenient way dispose open windows let hot air carry away 3 If cant above perhaps can take batteries build ing Keeping cool objective 4 Failing should least test batteries before first flight 102030 DISCHARGE TIME IN MINUTES AVG 500 ma LOAD 40 50 Fig 6 Shows results testing several battery packs under various environmental conditions Name Address ______________Cly.........Slalo......Zp after flight Several manufacturers now offering built-in battery testers part transmitter Fig 4 shows Kraft Signature transmitter being used test batteries Quickee 500 Fig 5 shows Bridi expanded-scale voltmeter performing same service Similar ESM available Royal Electronics Craft Air EKLogictrol others devices place load battery simulates load operating system can use operating system load use LED low-voltage detectors such Power-Cyt Flite Lite Corleys CVI discussed column length January April issues 1976 What ever use test dont guess test let load hang batteries least 30 seconds may find voltage drops quite rapidly danger zone Batteries recuperate little get chance rest flash reading may very well wrong Since correct information best defense might want run few bat tery discharge tests Now dont believe discharging battery way down time recommended some battery discharge/time tester manu facturers does use up some life battery think test purpose establishing baseline condition good idea test what have may find some thing like Fig 6 Surprise battery October1978 87 Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple conSTERLING MODELS 0 ST PHILA PA 19134 Co dealet anarlablo dIrect Orders accepted tO oddrtoAal atruction Balsa Plywood parts accurately cOarge trandling shIpping 500 orinormon 0 US Sr 25 diecut precision vacuum formed Plastic hull andootsrde US - - Catalog entIre roe Ct arrplane corrrtot roe model kIts 0 C ocare cabin Hardware package including A/C hardware Full and Trainer kIts Seat model kIts accessorres etc 500 errcinosed sized Plans plus Decals Sport model coast- Secrets Model AIrplane Surldrog IncludIng desIgn OOnstroctlOn cooerlng trotstring trying adlustinog coorroin systems etc 250 Guard versionO Secret ot Contol Line Catrine Flying Inclodtng ytotlrgttt soloIng stunting Cartter rote ants regolatrons Carrine ttereg trrnts cootot line tostallatino rostroctrOns 250 enclosed Noottecks Only U S money Orders currency accepted O-NEWCELL700F NEW CELL 7O0FAFTER 2 DAYS IN CAR USED CELL 1300F AFTER 2 DAYS IN CAR
Edition: Model Aviation - 1978/10
Page Numbers: 6, 7, 8, 86, 87
MIDWEST CL Models Great beginning controlline flier fun sport new series Goodyear Rac ersisstyledafterfull-size Formula aircraft also eligible AMA Scale Racer Class competi tion Kits complete including decals supply en gine paint \\ inwmu PRODUCTS CO M 400 Soutti Indiana St Hobart Indiana 46342 Letters Editor letters will carefully considered general interest used Send ModelAviation 815 15th St NW Washington DC 20005 Matching Pitch Operating Conditions very simple get rough idea propeller pitch required match particular velocity/rpm situation Take velocity airplane inches divide revolutions prop per second result will give required pitch inches diameter prop set driving face prop zero degrees angle attack Add couple degrees angle attack along blade elements will very close ideal pitch operating condition would examine Kit Bays Aug 1978 Letters conclusions regarding pitch/ velocity/rpm will find method described above giving identical values pitch However wrong assume once propeller begins operate its blade elements negative angle tack means acting air brake governing factor actual zero lift anglenot con fused term zero angle attack What kind rpm/prop combination would need use wanted soupup Austrian speed glider hit 300 mph 300 mph 5280 sec 333 416 500 583 666 Looking results above seems bind Because limitation diameter keep tip speed 950 per sec ond pitch/diameter ratio very high too high maximum efficiency occur ring value around 11 Decreasing required pitch increasing rpm doesnt help since shrinking diameter keeps ratio same looks like will take lot brute horsepower driving very inefficient prop propeller design requirements will look weird Because extreme blade angles blade area should concentrated towards tip pitch should non-helical same reason pitch increasing towards tip having its highest value near radius 70% posi tion high tip speed calls very very thin airfoils outer half blade should around 5%/6% thick tip would some arguments going three- four-bladed propeller Whatever number blades props would have fabricated using epoxy/ graphite/carbon promise never again get hooked RC subject point Im tempted write letters t things know nothing about Im disappearing forever favorite FAI Power model Bill Gieskieng Jr Denver CO Free Flight Famine fourth consecutive month Model viat ion has failed present con struction articles free flight models would writing letter MA independent publication magazine represented Official Publication Academy Model Aeronautics numerous model airplanes magazines cater terests radio-control modelers would hope Academys publication would try represent its members As things exist now four 4 monthly sec tions dedicated Control Line six 6 features about Radio Control including Oldtimers deals much radio control matters free flight two 2 sections free flight Maximum Diam 109 872 726 622 545 P/D Ratio 145 145 145 145 145 find difficult believe excellent free flight competition mod elers around cannot obtain worthy subjects publication feel its time AMA stopped con sidering free flights second rate mem bers started giving us much consideration other aspects hobby Joel Chesler Malverne Park NY Model Aviation often carpet alleged undercoverage event Radio people say dont give com parable material quantity other mag azinesbut some cases Control-Line people sometimes say exactly what Joel just said Free Flight MA has four free flight columnists two Warner Sport/Scale Meuser Duration Haught Oldtimers Tenny Indoor As old free fighter editor conscious weak coverage Powered Free Flightthough Meuser constantly presenting inside poop 36 Model Aviation Plumb CrazyKit No 254 Miss San BernardinoKit No 255 20K 1585 pitch 25K 30K 35K 40K Lii QuickieKit No 257 views good design can lay hands want publish power FF cannot present FA jobs lack interest plans bomb long period MA FF has perceived everyone stagnant witnes sing trend gadgetryala FAIand have assignments out top notch AMA job Class C worlds greatest FA jobs little point running string look-alike uninspir ing Half Half Class con ver sions Weve number does go Free fighters talk among themselves rarely submit design will undertake magazine task editor interested dogs non-powered segment FF different matterweve able publish va riety excellent airplanes Excellence key Does anyone have design truly worth publishing Incidentally far west digs bigger free flights wearies publishing diet Half OK free fightersits ship instructor used say Wheel Landings Re Lee Taylors article Art Thinking Big Julys magazinegen erally excellent article must take exception technique making wheel landings proper technique full-scale aircraft make normal flare except allow wheels touch before stall soon touch push stick forward before push stick forward airplane still flight nose will go down airspeed will build up youve got potential crash think technique applies equally well case either 1/4 scale full-scale aircraft just test flew new Lazy Ace used wheel landing have described worked per fectlyno scary stall rest Lee Taylors instructions OKas speed drops off come back stick avoid nosing over Lets see e models Keep Fox Fuel Line Models Life Blood Passes Through Simple Piece Fuel Line Surely Want Best As engine manufacturers acutely aware large portion called engine problems reality fuel line problems Symptoms fuel line trouble going lean air leaks speed fluctuations inability get rich enough high speed restricted flow Fox Fuel Lines best materials available physical proper ties selected model use Fox Fuel Lines worlds finest Tuft Line Silicone far strongest market semitransparent shows bubbles line heat resis tant Like silicone tubing tends slip oft fittings unless care taken Neoprene Actually complex compound much elastic clings fittings main disadvan tage transparent Surgical Tubing Pure Rubber Very flexible Use sharp bends necessary Semi-transparent Shows bubbles line Holds fittings well Main disadvantage tends deteriorate rapidly silicone neoprene Plastic good anybodys dont think much plastic fuel line Advantage low price transparency Disadvantage- tends collapse bends hardens age heat Tends leak air fittings after ITEM FUEL LINEPRICEITEM FUEL LINEPIUCE 86880 Small Neoprene2 Pog.5086885 Small Clear Plastic2 Pkg.25 86881 Medium Neoprene2 Plg.6086886 Medium Clear Plastic2/ Pbg.30 86882 Large Neoprene2 Pkg.7086887 Large Clear Plastic2 Pkg.40 86883 Small Tuft Line1 Pkg . 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 PRg70g68g9 Med Surgical Tubing2 Pkg.50 86851 Large Tuft Line1 Pkg10086890 Large Surgical Tubing2 Pkg.60 FOX MANUFACTURING Fox Model Airplane Products 5305 Towson Smith Arkansas 72901 e 501-646-1656 Answer 1o-Channel Dilemma NIMBUS 2-channel radio system offers American engineering import prices Features include. 1 Solid State superheterodyne 2 All Silicon transistor receiver circuit highly Selective front end 3 RF amplifier maximum signal noise ratio unexcelled selectivity 4 2 ultra small EK SM servos greater 4 pounds output thrust S Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticks full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program p 1977 EK-Proaucts Inc 779 EK-Products . . ober1978 7 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NATIONALS USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 Better quality control better selection hard maple wood 3 The best finish completelyfuelproof New Improved 1918 SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 634e9 733/.4iia 533% 45e 129 8%77%139 94565% 77%139 104567149 10SW 8W149 10SEW159 114677% 7A7%5159 11SEWiee 11%67169 125179 12SW179 1356239 145 6279 1556349 ie4%e449 17se599 15se599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES up good work Doug Mac Brien Granby MA About Quickie Regarding Quickie controversy opening letter Letters Editor August Model viation points up diverse interests model aviation Whereas Quickie article Don Ber liner did appeal Mr Walter Wirths turned completely would think Model Aviation magazine doing its civic duty modelers presenting indepth articles 3-views exciting new designs no plans kits available As know built Quickie V4 scale Berliner article supplemented information kit Quickie Enter prises information kit included CG location real aircraft did rely entirely because scaling fac tors built several gliders rubber ver sions Quickie establish better CG information also important decalage some refinement CG decalage 1/4 scale model now flies fine will submit construction article consideration Workable CGs 50% between root quarter-chords gliders 40% aft foreplane quarter-chord peanut V4 scale RC versions numbers will get air As important though decalage angles between wing foreplane chords must healthy 5 degrees John Hunton Annandale VA Regulations Big Models noticed Openers editorial July issue Model Aviation certainly relieved finally see word two warning big RC models am very much concerned about models can safely operated thought pylon racing 16 lb airplanes frankly appalling believe AMA should immediately initiate detailed investigation deter monsters can safely flown under same conditions procedures have used successfully smaller models very least must have absolute weight power restric tions will limit kinetic energy de veloped flight So far large designs appear floaters Everyone knows however Quadra engine can produce 5 hp mild rework dose nitro its matter time until 20-lb mod els capable very high speeds energy release impact such missiles could readily calculated effect direct hit another flier bystander difficult evaluate obvious however risk serious injury worse such collision sufficient warrant very careful consideration AMA Please review question publish additional information comment subject becomes available Glenn F Gresens Baton Rouge LA matter under study feeling seems would better govern ourselves big models create situation could lead FAA determining should impose re strictions Further information will printed MA becomes available Reply Gieskieng should realized great deal information given propeller articles has gleaned just plain engineering data theory applied propellers general As stated original article has very little research done propellers models scientific manner objec tive articles show modelers what areas research could done hope improving breed per sonally have doing some research feel have scratched surface fact recent work dicates may very well true diameter Formula propeller can increased 8 full 10 have new prop competitive race something good has obviously found next objective would take advantage findings develop full potential appears realistic point say much can gained through propeller research points Bill has brought out valid can make worthy addi tions what has already presented point prop pitch relative zero lift angle various airfoils problems encountered delving something well established pro pellers able describe relate design manner familiar average modeler people confused what say understand work wasted can bit difficult consider ramifications pitch propellers number reasons has always measured back side blade stated inches Inasmuch airfoils used have very flat bottom has good reference point thrust pro peller created lift airfoil windmill effect leverage rear side blade Bill suggests should measure pitch zero lift angle airfoil rather what back blade customary would help applying theory comparisons made between various Continued page 86 8 Model Aviation THE LEADER IN COM PETITION PROPELLERS WINNERS HAVE RC PYLON RACING DIAPITCHPRICE 53%4 129 756 149 7SN SN 1A9 5%6% 6% 7 7%7%159 977% 7%159 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 755%149 7 7%10%11169 5 59159 S aN 9%%159 9 1213229 N NARROW knocked angry hound reached out through burlap bag sunk teeth Walts ankle ther ship returned after 12 years day its last flight hunter found itwhile searched weeksand sold guy town 35 miles away modeler guy found out fly itwhich did years Good Broth ers receiver bought old back issue magazine found picture airplane thing led another two maga zines removed offered back yesterdays dream ship settled historic receiver now Beam come back haunt us built 1958 lost once 1960 landed Grummans parking lota seagull thought watchman Beam given Norm Ro senstock flying buddies know sometimes does unexpected So flew little Beam 1966 untilbut cant set epitaph date now preserve memories good old days Lost Airplane Ground Check Interfer ence did change Found sign name non-existent ad dress ancient phone number got wrapped up explaining Beam disbelieving spectator forgot turn switch custom perseveres some quarters very day Enter cabin cruiser Good Samaritan skipper phone call puzzled Informa tion letter shown postman old neighbor presently made its way Virginia So airplane found What airplane thought Norm shorten hairy dog story include new picture Norm Beam Its full wicked warps says mention front because Beam doesnt know Still flies great euphoric days Lost Airplane Ground Check Interference still live What favorite airplane thousands subjects choose modelers seized least once overwhelming urge transform some particular aircraft dreamship project does assess par ticular design above others Beautiful lines uniqueness torical background Spitfire un touched its grace symmetry line R J Mitchell its designer already put incomparable touch Supermarme Schneider Trophy racers died before saw airplane Spitfire save country Mus tang symphony inspired engineer ing probably best its kind jaunty SE-5 typifies spirit WW later-day biplane Like ever-popular Curtiss Hawk its glor iously tapered staggered wings pugnacious Laird Super Solution racer Connie its impressively cowled engines circular cross section Lock heed-Lightning planformed wing Tn-Star among Jumbos perhaps screen flashed long series slides living color depicted civil military types big fly-in Thomas Morse Concorde homebuilts pair Republic Thuds commentary ran suddenly P-38 head silver against blue sky Silence room broke sustained ap plause Gentlemen give Lightning Letters Editor continued page 8 types airfoils However what else has considered thrust comes airfoil also windmill effect So actual pitch would angle back side would true lift angle airfoil instead would compromise two So would appear what have con sider descriptive number use differentiate between var ious propellers call pitch would better called model number practice used comparative purposes work remain comparable norm too must follow procedure though may theoretically correct interesting learn NACA done some work stream lined airfoils propellersapparently using same reasoning suggested prop articles good know seen improvement through use some sort symmetrical type airfoil Bills info Yes true some racing props reach 27K air also true explained article may very good practice due reaching speed range compressi bility probably number areas can explored find improvements along line such multi-bladed props Unfortunately competition purposes sort thing usually worked out restricted 2-bladed props practical reason work would have done other areas Sug gestions would use high-speed airfoils and/or sweepback portion blade subjected Mach speeds As prop production portion article indicated use templates prop blocks will put ballpark pitch blade widths Obviously final finishing should done some sort pitch gauge have pitch gauge instrument obviously use ful otherwise suggestion making template angles station will work well also also interesting know NACA done some work loca tion maximum blade width found some improvement using 38% product review product review product review 86 Model Aviation ultimate finishVW kote ciear S/p liquid goes over favorite paint & produces high gloss finish remarkably fuel resistant coat No mixing No short pot life Also fantastic Coverite COVERITE 2779 PHILMONT AVE HUNTINGOON VALLEY PA Norm Rosenstock Beam product review product review product review Glaskote Clear liquid goes over painted surface high-gloss fuel-resistant finish Flows like butter leaving no brush marks Mixing required no two parts no short pot life High percentage solids allows coat Dries quickly yet levels well Half-pint cans Coverite 2779 Philmont Ave Huntingdon Valley PA 19006 previous data indicated 60 66% ideal NACA data would indicate some work blade width location might bear some fruit Something else try hope readers will see letter has added worth what previously offered way pooled knowledge can make investigation easier interesting part believe recent prop work has discovered basis what could super prop Formula racing least results drastic change have very surprising enlightening Should dear editor see fit per haps will able pass findings along near future Harold deBolt Buffalo NY Mr deBolts letter responds earlier letter Bill Gieskienghe has seen Bills letter months column dear editor waffling won ders f world ready Harolds lat est findings unloading figures unbelievablediference between onground in-flight rpm ed also terrjfied sharpie Pylon guys sailplane designers wodld feel better some positive Pylon guys would try some deBolts earlier article revelations about itshould carry RC Technique/Myers continued page 16 item really wise treat care lessl Having stated problem its time suggest some solutions 1 Park shade 2 Cover windows keep out sunlight problem Greenhouse Effect Sunlight passes through glass heat interior car heated interior tries radiate its excess heat back out window cant because radiant energy frequency associated 60 -3 d U 1-50 -J 0 0 0 40 0 FE low temperature interior car much lower frequency sunlight glass black lower frequencies So heat stays car collects raising temperature convenient way dispose open windows let hot air carry away 3 If cant above perhaps can take batteries build ing Keeping cool objective 4 Failing should least test batteries before first flight 102030 DISCHARGE TIME IN MINUTES AVG 500 ma LOAD 40 50 Fig 6 Shows results testing several battery packs under various environmental conditions Name Address ______________Cly.........Slalo......Zp after flight Several manufacturers now offering built-in battery testers part transmitter Fig 4 shows Kraft Signature transmitter being used test batteries Quickee 500 Fig 5 shows Bridi expanded-scale voltmeter performing same service Similar ESM available Royal Electronics Craft Air EKLogictrol others devices place load battery simulates load operating system can use operating system load use LED low-voltage detectors such Power-Cyt Flite Lite Corleys CVI discussed column length January April issues 1976 What ever use test dont guess test let load hang batteries least 30 seconds may find voltage drops quite rapidly danger zone Batteries recuperate little get chance rest flash reading may very well wrong Since correct information best defense might want run few bat tery discharge tests Now dont believe discharging battery way down time recommended some battery discharge/time tester manu facturers does use up some life battery think test purpose establishing baseline condition good idea test what have may find some thing like Fig 6 Surprise battery October1978 87 Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple conSTERLING MODELS 0 ST PHILA PA 19134 Co dealet anarlablo dIrect Orders accepted tO oddrtoAal atruction Balsa Plywood parts accurately cOarge trandling shIpping 500 orinormon 0 US Sr 25 diecut precision vacuum formed Plastic hull andootsrde US - - Catalog entIre roe Ct arrplane corrrtot roe model kIts 0 C ocare cabin Hardware package including A/C hardware Full and Trainer kIts Seat model kIts accessorres etc 500 errcinosed sized Plans plus Decals Sport model coast- Secrets Model AIrplane Surldrog IncludIng desIgn OOnstroctlOn cooerlng trotstring trying adlustinog coorroin systems etc 250 Guard versionO Secret ot Contol Line Catrine Flying Inclodtng ytotlrgttt soloIng stunting Cartter rote ants regolatrons Carrine ttereg trrnts cootot line tostallatino rostroctrOns 250 enclosed Noottecks Only U S money Orders currency accepted O-NEWCELL700F NEW CELL 7O0FAFTER 2 DAYS IN CAR USED CELL 1300F AFTER 2 DAYS IN CAR
Edition: Model Aviation - 1978/10
Page Numbers: 6, 7, 8, 86, 87
MIDWEST CL Models Great beginning controlline flier fun sport new series Goodyear Rac ersisstyledafterfull-size Formula aircraft also eligible AMA Scale Racer Class competi tion Kits complete including decals supply en gine paint \\ inwmu PRODUCTS CO M 400 Soutti Indiana St Hobart Indiana 46342 Letters Editor letters will carefully considered general interest used Send ModelAviation 815 15th St NW Washington DC 20005 Matching Pitch Operating Conditions very simple get rough idea propeller pitch required match particular velocity/rpm situation Take velocity airplane inches divide revolutions prop per second result will give required pitch inches diameter prop set driving face prop zero degrees angle attack Add couple degrees angle attack along blade elements will very close ideal pitch operating condition would examine Kit Bays Aug 1978 Letters conclusions regarding pitch/ velocity/rpm will find method described above giving identical values pitch However wrong assume once propeller begins operate its blade elements negative angle tack means acting air brake governing factor actual zero lift anglenot con fused term zero angle attack What kind rpm/prop combination would need use wanted soupup Austrian speed glider hit 300 mph 300 mph 5280 sec 333 416 500 583 666 Looking results above seems bind Because limitation diameter keep tip speed 950 per sec ond pitch/diameter ratio very high too high maximum efficiency occur ring value around 11 Decreasing required pitch increasing rpm doesnt help since shrinking diameter keeps ratio same looks like will take lot brute horsepower driving very inefficient prop propeller design requirements will look weird Because extreme blade angles blade area should concentrated towards tip pitch should non-helical same reason pitch increasing towards tip having its highest value near radius 70% posi tion high tip speed calls very very thin airfoils outer half blade should around 5%/6% thick tip would some arguments going three- four-bladed propeller Whatever number blades props would have fabricated using epoxy/ graphite/carbon promise never again get hooked RC subject point Im tempted write letters t things know nothing about Im disappearing forever favorite FAI Power model Bill Gieskieng Jr Denver CO Free Flight Famine fourth consecutive month Model viat ion has failed present con struction articles free flight models would writing letter MA independent publication magazine represented Official Publication Academy Model Aeronautics numerous model airplanes magazines cater terests radio-control modelers would hope Academys publication would try represent its members As things exist now four 4 monthly sec tions dedicated Control Line six 6 features about Radio Control including Oldtimers deals much radio control matters free flight two 2 sections free flight Maximum Diam 109 872 726 622 545 P/D Ratio 145 145 145 145 145 find difficult believe excellent free flight competition mod elers around cannot obtain worthy subjects publication feel its time AMA stopped con sidering free flights second rate mem bers started giving us much consideration other aspects hobby Joel Chesler Malverne Park NY Model Aviation often carpet alleged undercoverage event Radio people say dont give com parable material quantity other mag azinesbut some cases Control-Line people sometimes say exactly what Joel just said Free Flight MA has four free flight columnists two Warner Sport/Scale Meuser Duration Haught Oldtimers Tenny Indoor As old free fighter editor conscious weak coverage Powered Free Flightthough Meuser constantly presenting inside poop 36 Model Aviation Plumb CrazyKit No 254 Miss San BernardinoKit No 255 20K 1585 pitch 25K 30K 35K 40K Lii QuickieKit No 257 views good design can lay hands want publish power FF cannot present FA jobs lack interest plans bomb long period MA FF has perceived everyone stagnant witnes sing trend gadgetryala FAIand have assignments out top notch AMA job Class C worlds greatest FA jobs little point running string look-alike uninspir ing Half Half Class con ver sions Weve number does go Free fighters talk among themselves rarely submit design will undertake magazine task editor interested dogs non-powered segment FF different matterweve able publish va riety excellent airplanes Excellence key Does anyone have design truly worth publishing Incidentally far west digs bigger free flights wearies publishing diet Half OK free fightersits ship instructor used say Wheel Landings Re Lee Taylors article Art Thinking Big Julys magazinegen erally excellent article must take exception technique making wheel landings proper technique full-scale aircraft make normal flare except allow wheels touch before stall soon touch push stick forward before push stick forward airplane still flight nose will go down airspeed will build up youve got potential crash think technique applies equally well case either 1/4 scale full-scale aircraft just test flew new Lazy Ace used wheel landing have described worked per fectlyno scary stall rest Lee Taylors instructions OKas speed drops off come back stick avoid nosing over Lets see e models Keep Fox Fuel Line Models Life Blood Passes Through Simple Piece Fuel Line Surely Want Best As engine manufacturers acutely aware large portion called engine problems reality fuel line problems Symptoms fuel line trouble going lean air leaks speed fluctuations inability get rich enough high speed restricted flow Fox Fuel Lines best materials available physical proper ties selected model use Fox Fuel Lines worlds finest Tuft Line Silicone far strongest market semitransparent shows bubbles line heat resis tant Like silicone tubing tends slip oft fittings unless care taken Neoprene Actually complex compound much elastic clings fittings main disadvan tage transparent Surgical Tubing Pure Rubber Very flexible Use sharp bends necessary Semi-transparent Shows bubbles line Holds fittings well Main disadvantage tends deteriorate rapidly silicone neoprene Plastic good anybodys dont think much plastic fuel line Advantage low price transparency Disadvantage- tends collapse bends hardens age heat Tends leak air fittings after ITEM FUEL LINEPRICEITEM FUEL LINEPIUCE 86880 Small Neoprene2 Pog.5086885 Small Clear Plastic2 Pkg.25 86881 Medium Neoprene2 Plg.6086886 Medium Clear Plastic2/ Pbg.30 86882 Large Neoprene2 Pkg.7086887 Large Clear Plastic2 Pkg.40 86883 Small Tuft Line1 Pkg . 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 PRg70g68g9 Med Surgical Tubing2 Pkg.50 86851 Large Tuft Line1 Pkg10086890 Large Surgical Tubing2 Pkg.60 FOX MANUFACTURING Fox Model Airplane Products 5305 Towson Smith Arkansas 72901 e 501-646-1656 Answer 1o-Channel Dilemma NIMBUS 2-channel radio system offers American engineering import prices Features include. 1 Solid State superheterodyne 2 All Silicon transistor receiver circuit highly Selective front end 3 RF amplifier maximum signal noise ratio unexcelled selectivity 4 2 ultra small EK SM servos greater 4 pounds output thrust S Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticks full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program p 1977 EK-Proaucts Inc 779 EK-Products . . ober1978 7 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NATIONALS USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 Better quality control better selection hard maple wood 3 The best finish completelyfuelproof New Improved 1918 SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 634e9 733/.4iia 533% 45e 129 8%77%139 94565% 77%139 104567149 10SW 8W149 10SEW159 114677% 7A7%5159 11SEWiee 11%67169 125179 12SW179 1356239 145 6279 1556349 ie4%e449 17se599 15se599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES up good work Doug Mac Brien Granby MA About Quickie Regarding Quickie controversy opening letter Letters Editor August Model viation points up diverse interests model aviation Whereas Quickie article Don Ber liner did appeal Mr Walter Wirths turned completely would think Model Aviation magazine doing its civic duty modelers presenting indepth articles 3-views exciting new designs no plans kits available As know built Quickie V4 scale Berliner article supplemented information kit Quickie Enter prises information kit included CG location real aircraft did rely entirely because scaling fac tors built several gliders rubber ver sions Quickie establish better CG information also important decalage some refinement CG decalage 1/4 scale model now flies fine will submit construction article consideration Workable CGs 50% between root quarter-chords gliders 40% aft foreplane quarter-chord peanut V4 scale RC versions numbers will get air As important though decalage angles between wing foreplane chords must healthy 5 degrees John Hunton Annandale VA Regulations Big Models noticed Openers editorial July issue Model Aviation certainly relieved finally see word two warning big RC models am very much concerned about models can safely operated thought pylon racing 16 lb airplanes frankly appalling believe AMA should immediately initiate detailed investigation deter monsters can safely flown under same conditions procedures have used successfully smaller models very least must have absolute weight power restric tions will limit kinetic energy de veloped flight So far large designs appear floaters Everyone knows however Quadra engine can produce 5 hp mild rework dose nitro its matter time until 20-lb mod els capable very high speeds energy release impact such missiles could readily calculated effect direct hit another flier bystander difficult evaluate obvious however risk serious injury worse such collision sufficient warrant very careful consideration AMA Please review question publish additional information comment subject becomes available Glenn F Gresens Baton Rouge LA matter under study feeling seems would better govern ourselves big models create situation could lead FAA determining should impose re strictions Further information will printed MA becomes available Reply Gieskieng should realized great deal information given propeller articles has gleaned just plain engineering data theory applied propellers general As stated original article has very little research done propellers models scientific manner objec tive articles show modelers what areas research could done hope improving breed per sonally have doing some research feel have scratched surface fact recent work dicates may very well true diameter Formula propeller can increased 8 full 10 have new prop competitive race something good has obviously found next objective would take advantage findings develop full potential appears realistic point say much can gained through propeller research points Bill has brought out valid can make worthy addi tions what has already presented point prop pitch relative zero lift angle various airfoils problems encountered delving something well established pro pellers able describe relate design manner familiar average modeler people confused what say understand work wasted can bit difficult consider ramifications pitch propellers number reasons has always measured back side blade stated inches Inasmuch airfoils used have very flat bottom has good reference point thrust pro peller created lift airfoil windmill effect leverage rear side blade Bill suggests should measure pitch zero lift angle airfoil rather what back blade customary would help applying theory comparisons made between various Continued page 86 8 Model Aviation THE LEADER IN COM PETITION PROPELLERS WINNERS HAVE RC PYLON RACING DIAPITCHPRICE 53%4 129 756 149 7SN SN 1A9 5%6% 6% 7 7%7%159 977% 7%159 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 755%149 7 7%10%11169 5 59159 S aN 9%%159 9 1213229 N NARROW knocked angry hound reached out through burlap bag sunk teeth Walts ankle ther ship returned after 12 years day its last flight hunter found itwhile searched weeksand sold guy town 35 miles away modeler guy found out fly itwhich did years Good Broth ers receiver bought old back issue magazine found picture airplane thing led another two maga zines removed offered back yesterdays dream ship settled historic receiver now Beam come back haunt us built 1958 lost once 1960 landed Grummans parking lota seagull thought watchman Beam given Norm Ro senstock flying buddies know sometimes does unexpected So flew little Beam 1966 untilbut cant set epitaph date now preserve memories good old days Lost Airplane Ground Check Interfer ence did change Found sign name non-existent ad dress ancient phone number got wrapped up explaining Beam disbelieving spectator forgot turn switch custom perseveres some quarters very day Enter cabin cruiser Good Samaritan skipper phone call puzzled Informa tion letter shown postman old neighbor presently made its way Virginia So airplane found What airplane thought Norm shorten hairy dog story include new picture Norm Beam Its full wicked warps says mention front because Beam doesnt know Still flies great euphoric days Lost Airplane Ground Check Interference still live What favorite airplane thousands subjects choose modelers seized least once overwhelming urge transform some particular aircraft dreamship project does assess par ticular design above others Beautiful lines uniqueness torical background Spitfire un touched its grace symmetry line R J Mitchell its designer already put incomparable touch Supermarme Schneider Trophy racers died before saw airplane Spitfire save country Mus tang symphony inspired engineer ing probably best its kind jaunty SE-5 typifies spirit WW later-day biplane Like ever-popular Curtiss Hawk its glor iously tapered staggered wings pugnacious Laird Super Solution racer Connie its impressively cowled engines circular cross section Lock heed-Lightning planformed wing Tn-Star among Jumbos perhaps screen flashed long series slides living color depicted civil military types big fly-in Thomas Morse Concorde homebuilts pair Republic Thuds commentary ran suddenly P-38 head silver against blue sky Silence room broke sustained ap plause Gentlemen give Lightning Letters Editor continued page 8 types airfoils However what else has considered thrust comes airfoil also windmill effect So actual pitch would angle back side would true lift angle airfoil instead would compromise two So would appear what have con sider descriptive number use differentiate between var ious propellers call pitch would better called model number practice used comparative purposes work remain comparable norm too must follow procedure though may theoretically correct interesting learn NACA done some work stream lined airfoils propellersapparently using same reasoning suggested prop articles good know seen improvement through use some sort symmetrical type airfoil Bills info Yes true some racing props reach 27K air also true explained article may very good practice due reaching speed range compressi bility probably number areas can explored find improvements along line such multi-bladed props Unfortunately competition purposes sort thing usually worked out restricted 2-bladed props practical reason work would have done other areas Sug gestions would use high-speed airfoils and/or sweepback portion blade subjected Mach speeds As prop production portion article indicated use templates prop blocks will put ballpark pitch blade widths Obviously final finishing should done some sort pitch gauge have pitch gauge instrument obviously use ful otherwise suggestion making template angles station will work well also also interesting know NACA done some work loca tion maximum blade width found some improvement using 38% product review product review product review 86 Model Aviation ultimate finishVW kote ciear S/p liquid goes over favorite paint & produces high gloss finish remarkably fuel resistant coat No mixing No short pot life Also fantastic Coverite COVERITE 2779 PHILMONT AVE HUNTINGOON VALLEY PA Norm Rosenstock Beam product review product review product review Glaskote Clear liquid goes over painted surface high-gloss fuel-resistant finish Flows like butter leaving no brush marks Mixing required no two parts no short pot life High percentage solids allows coat Dries quickly yet levels well Half-pint cans Coverite 2779 Philmont Ave Huntingdon Valley PA 19006 previous data indicated 60 66% ideal NACA data would indicate some work blade width location might bear some fruit Something else try hope readers will see letter has added worth what previously offered way pooled knowledge can make investigation easier interesting part believe recent prop work has discovered basis what could super prop Formula racing least results drastic change have very surprising enlightening Should dear editor see fit per haps will able pass findings along near future Harold deBolt Buffalo NY Mr deBolts letter responds earlier letter Bill Gieskienghe has seen Bills letter months column dear editor waffling won ders f world ready Harolds lat est findings unloading figures unbelievablediference between onground in-flight rpm ed also terrjfied sharpie Pylon guys sailplane designers wodld feel better some positive Pylon guys would try some deBolts earlier article revelations about itshould carry RC Technique/Myers continued page 16 item really wise treat care lessl Having stated problem its time suggest some solutions 1 Park shade 2 Cover windows keep out sunlight problem Greenhouse Effect Sunlight passes through glass heat interior car heated interior tries radiate its excess heat back out window cant because radiant energy frequency associated 60 -3 d U 1-50 -J 0 0 0 40 0 FE low temperature interior car much lower frequency sunlight glass black lower frequencies So heat stays car collects raising temperature convenient way dispose open windows let hot air carry away 3 If cant above perhaps can take batteries build ing Keeping cool objective 4 Failing should least test batteries before first flight 102030 DISCHARGE TIME IN MINUTES AVG 500 ma LOAD 40 50 Fig 6 Shows results testing several battery packs under various environmental conditions Name Address ______________Cly.........Slalo......Zp after flight Several manufacturers now offering built-in battery testers part transmitter Fig 4 shows Kraft Signature transmitter being used test batteries Quickee 500 Fig 5 shows Bridi expanded-scale voltmeter performing same service Similar ESM available Royal Electronics Craft Air EKLogictrol others devices place load battery simulates load operating system can use operating system load use LED low-voltage detectors such Power-Cyt Flite Lite Corleys CVI discussed column length January April issues 1976 What ever use test dont guess test let load hang batteries least 30 seconds may find voltage drops quite rapidly danger zone Batteries recuperate little get chance rest flash reading may very well wrong Since correct information best defense might want run few bat tery discharge tests Now dont believe discharging battery way down time recommended some battery discharge/time tester manu facturers does use up some life battery think test purpose establishing baseline condition good idea test what have may find some thing like Fig 6 Surprise battery October1978 87 Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple conSTERLING MODELS 0 ST PHILA PA 19134 Co dealet anarlablo dIrect Orders accepted tO oddrtoAal atruction Balsa Plywood parts accurately cOarge trandling shIpping 500 orinormon 0 US Sr 25 diecut precision vacuum formed Plastic hull andootsrde US - - Catalog entIre roe Ct arrplane corrrtot roe model kIts 0 C ocare cabin Hardware package including A/C hardware Full and Trainer kIts Seat model kIts accessorres etc 500 errcinosed sized Plans plus Decals Sport model coast- Secrets Model AIrplane Surldrog IncludIng desIgn OOnstroctlOn cooerlng trotstring trying adlustinog coorroin systems etc 250 Guard versionO Secret ot Contol Line Catrine Flying Inclodtng ytotlrgttt soloIng stunting Cartter rote ants regolatrons Carrine ttereg trrnts cootot line tostallatino rostroctrOns 250 enclosed Noottecks Only U S money Orders currency accepted O-NEWCELL700F NEW CELL 7O0FAFTER 2 DAYS IN CAR USED CELL 1300F AFTER 2 DAYS IN CAR
Edition: Model Aviation - 1978/10
Page Numbers: 6, 7, 8, 86, 87
MIDWEST CL Models Great beginning controlline flier fun sport new series Goodyear Rac ersisstyledafterfull-size Formula aircraft also eligible AMA Scale Racer Class competi tion Kits complete including decals supply en gine paint \\ inwmu PRODUCTS CO M 400 Soutti Indiana St Hobart Indiana 46342 Letters Editor letters will carefully considered general interest used Send ModelAviation 815 15th St NW Washington DC 20005 Matching Pitch Operating Conditions very simple get rough idea propeller pitch required match particular velocity/rpm situation Take velocity airplane inches divide revolutions prop per second result will give required pitch inches diameter prop set driving face prop zero degrees angle attack Add couple degrees angle attack along blade elements will very close ideal pitch operating condition would examine Kit Bays Aug 1978 Letters conclusions regarding pitch/ velocity/rpm will find method described above giving identical values pitch However wrong assume once propeller begins operate its blade elements negative angle tack means acting air brake governing factor actual zero lift anglenot con fused term zero angle attack What kind rpm/prop combination would need use wanted soupup Austrian speed glider hit 300 mph 300 mph 5280 sec 333 416 500 583 666 Looking results above seems bind Because limitation diameter keep tip speed 950 per sec ond pitch/diameter ratio very high too high maximum efficiency occur ring value around 11 Decreasing required pitch increasing rpm doesnt help since shrinking diameter keeps ratio same looks like will take lot brute horsepower driving very inefficient prop propeller design requirements will look weird Because extreme blade angles blade area should concentrated towards tip pitch should non-helical same reason pitch increasing towards tip having its highest value near radius 70% posi tion high tip speed calls very very thin airfoils outer half blade should around 5%/6% thick tip would some arguments going three- four-bladed propeller Whatever number blades props would have fabricated using epoxy/ graphite/carbon promise never again get hooked RC subject point Im tempted write letters t things know nothing about Im disappearing forever favorite FAI Power model Bill Gieskieng Jr Denver CO Free Flight Famine fourth consecutive month Model viat ion has failed present con struction articles free flight models would writing letter MA independent publication magazine represented Official Publication Academy Model Aeronautics numerous model airplanes magazines cater terests radio-control modelers would hope Academys publication would try represent its members As things exist now four 4 monthly sec tions dedicated Control Line six 6 features about Radio Control including Oldtimers deals much radio control matters free flight two 2 sections free flight Maximum Diam 109 872 726 622 545 P/D Ratio 145 145 145 145 145 find difficult believe excellent free flight competition mod elers around cannot obtain worthy subjects publication feel its time AMA stopped con sidering free flights second rate mem bers started giving us much consideration other aspects hobby Joel Chesler Malverne Park NY Model Aviation often carpet alleged undercoverage event Radio people say dont give com parable material quantity other mag azinesbut some cases Control-Line people sometimes say exactly what Joel just said Free Flight MA has four free flight columnists two Warner Sport/Scale Meuser Duration Haught Oldtimers Tenny Indoor As old free fighter editor conscious weak coverage Powered Free Flightthough Meuser constantly presenting inside poop 36 Model Aviation Plumb CrazyKit No 254 Miss San BernardinoKit No 255 20K 1585 pitch 25K 30K 35K 40K Lii QuickieKit No 257 views good design can lay hands want publish power FF cannot present FA jobs lack interest plans bomb long period MA FF has perceived everyone stagnant witnes sing trend gadgetryala FAIand have assignments out top notch AMA job Class C worlds greatest FA jobs little point running string look-alike uninspir ing Half Half Class con ver sions Weve number does go Free fighters talk among themselves rarely submit design will undertake magazine task editor interested dogs non-powered segment FF different matterweve able publish va riety excellent airplanes Excellence key Does anyone have design truly worth publishing Incidentally far west digs bigger free flights wearies publishing diet Half OK free fightersits ship instructor used say Wheel Landings Re Lee Taylors article Art Thinking Big Julys magazinegen erally excellent article must take exception technique making wheel landings proper technique full-scale aircraft make normal flare except allow wheels touch before stall soon touch push stick forward before push stick forward airplane still flight nose will go down airspeed will build up youve got potential crash think technique applies equally well case either 1/4 scale full-scale aircraft just test flew new Lazy Ace used wheel landing have described worked per fectlyno scary stall rest Lee Taylors instructions OKas speed drops off come back stick avoid nosing over Lets see e models Keep Fox Fuel Line Models Life Blood Passes Through Simple Piece Fuel Line Surely Want Best As engine manufacturers acutely aware large portion called engine problems reality fuel line problems Symptoms fuel line trouble going lean air leaks speed fluctuations inability get rich enough high speed restricted flow Fox Fuel Lines best materials available physical proper ties selected model use Fox Fuel Lines worlds finest Tuft Line Silicone far strongest market semitransparent shows bubbles line heat resis tant Like silicone tubing tends slip oft fittings unless care taken Neoprene Actually complex compound much elastic clings fittings main disadvan tage transparent Surgical Tubing Pure Rubber Very flexible Use sharp bends necessary Semi-transparent Shows bubbles line Holds fittings well Main disadvantage tends deteriorate rapidly silicone neoprene Plastic good anybodys dont think much plastic fuel line Advantage low price transparency Disadvantage- tends collapse bends hardens age heat Tends leak air fittings after ITEM FUEL LINEPRICEITEM FUEL LINEPIUCE 86880 Small Neoprene2 Pog.5086885 Small Clear Plastic2 Pkg.25 86881 Medium Neoprene2 Plg.6086886 Medium Clear Plastic2/ Pbg.30 86882 Large Neoprene2 Pkg.7086887 Large Clear Plastic2 Pkg.40 86883 Small Tuft Line1 Pkg . 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 PRg70g68g9 Med Surgical Tubing2 Pkg.50 86851 Large Tuft Line1 Pkg10086890 Large Surgical Tubing2 Pkg.60 FOX MANUFACTURING Fox Model Airplane Products 5305 Towson Smith Arkansas 72901 e 501-646-1656 Answer 1o-Channel Dilemma NIMBUS 2-channel radio system offers American engineering import prices Features include. 1 Solid State superheterodyne 2 All Silicon transistor receiver circuit highly Selective front end 3 RF amplifier maximum signal noise ratio unexcelled selectivity 4 2 ultra small EK SM servos greater 4 pounds output thrust S Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticks full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program p 1977 EK-Proaucts Inc 779 EK-Products . . ober1978 7 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NATIONALS USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 Better quality control better selection hard maple wood 3 The best finish completelyfuelproof New Improved 1918 SPECIAL PRO SERIES 2 FOR RCFREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 634e9 733/.4iia 533% 45e 129 8%77%139 94565% 77%139 104567149 10SW 8W149 10SEW159 114677% 7A7%5159 11SEWiee 11%67169 125179 12SW179 1356239 145 6279 1556349 ie4%e449 17se599 15se599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B FOR SPEED & RACING ADVANCED DESIGN NO 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES up good work Doug Mac Brien Granby MA About Quickie Regarding Quickie controversy opening letter Letters Editor August Model viation points up diverse interests model aviation Whereas Quickie article Don Ber liner did appeal Mr Walter Wirths turned completely would think Model Aviation magazine doing its civic duty modelers presenting indepth articles 3-views exciting new designs no plans kits available As know built Quickie V4 scale Berliner article supplemented information kit Quickie Enter prises information kit included CG location real aircraft did rely entirely because scaling fac tors built several gliders rubber ver sions Quickie establish better CG information also important decalage some refinement CG decalage 1/4 scale model now flies fine will submit construction article consideration Workable CGs 50% between root quarter-chords gliders 40% aft foreplane quarter-chord peanut V4 scale RC versions numbers will get air As important though decalage angles between wing foreplane chords must healthy 5 degrees John Hunton Annandale VA Regulations Big Models noticed Openers editorial July issue Model Aviation certainly relieved finally see word two warning big RC models am very much concerned about models can safely operated thought pylon racing 16 lb airplanes frankly appalling believe AMA should immediately initiate detailed investigation deter monsters can safely flown under same conditions procedures have used successfully smaller models very least must have absolute weight power restric tions will limit kinetic energy de veloped flight So far large designs appear floaters Everyone knows however Quadra engine can produce 5 hp mild rework dose nitro its matter time until 20-lb mod els capable very high speeds energy release impact such missiles could readily calculated effect direct hit another flier bystander difficult evaluate obvious however risk serious injury worse such collision sufficient warrant very careful consideration AMA Please review question publish additional information comment subject becomes available Glenn F Gresens Baton Rouge LA matter under study feeling seems would better govern ourselves big models create situation could lead FAA determining should impose re strictions Further information will printed MA becomes available Reply Gieskieng should realized great deal information given propeller articles has gleaned just plain engineering data theory applied propellers general As stated original article has very little research done propellers models scientific manner objec tive articles show modelers what areas research could done hope improving breed per sonally have doing some research feel have scratched surface fact recent work dicates may very well true diameter Formula propeller can increased 8 full 10 have new prop competitive race something good has obviously found next objective would take advantage findings develop full potential appears realistic point say much can gained through propeller research points Bill has brought out valid can make worthy addi tions what has already presented point prop pitch relative zero lift angle various airfoils problems encountered delving something well established pro pellers able describe relate design manner familiar average modeler people confused what say understand work wasted can bit difficult consider ramifications pitch propellers number reasons has always measured back side blade stated inches Inasmuch airfoils used have very flat bottom has good reference point thrust pro peller created lift airfoil windmill effect leverage rear side blade Bill suggests should measure pitch zero lift angle airfoil rather what back blade customary would help applying theory comparisons made between various Continued page 86 8 Model Aviation THE LEADER IN COM PETITION PROPELLERS WINNERS HAVE RC PYLON RACING DIAPITCHPRICE 53%4 129 756 149 7SN SN 1A9 5%6% 6% 7 7%7%159 977% 7%159 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 755%149 7 7%10%11169 5 59159 S aN 9%%159 9 1213229 N NARROW knocked angry hound reached out through burlap bag sunk teeth Walts ankle ther ship returned after 12 years day its last flight hunter found itwhile searched weeksand sold guy town 35 miles away modeler guy found out fly itwhich did years Good Broth ers receiver bought old back issue magazine found picture airplane thing led another two maga zines removed offered back yesterdays dream ship settled historic receiver now Beam come back haunt us built 1958 lost once 1960 landed Grummans parking lota seagull thought watchman Beam given Norm Ro senstock flying buddies know sometimes does unexpected So flew little Beam 1966 untilbut cant set epitaph date now preserve memories good old days Lost Airplane Ground Check Interfer ence did change Found sign name non-existent ad dress ancient phone number got wrapped up explaining Beam disbelieving spectator forgot turn switch custom perseveres some quarters very day Enter cabin cruiser Good Samaritan skipper phone call puzzled Informa tion letter shown postman old neighbor presently made its way Virginia So airplane found What airplane thought Norm shorten hairy dog story include new picture Norm Beam Its full wicked warps says mention front because Beam doesnt know Still flies great euphoric days Lost Airplane Ground Check Interference still live What favorite airplane thousands subjects choose modelers seized least once overwhelming urge transform some particular aircraft dreamship project does assess par ticular design above others Beautiful lines uniqueness torical background Spitfire un touched its grace symmetry line R J Mitchell its designer already put incomparable touch Supermarme Schneider Trophy racers died before saw airplane Spitfire save country Mus tang symphony inspired engineer ing probably best its kind jaunty SE-5 typifies spirit WW later-day biplane Like ever-popular Curtiss Hawk its glor iously tapered staggered wings pugnacious Laird Super Solution racer Connie its impressively cowled engines circular cross section Lock heed-Lightning planformed wing Tn-Star among Jumbos perhaps screen flashed long series slides living color depicted civil military types big fly-in Thomas Morse Concorde homebuilts pair Republic Thuds commentary ran suddenly P-38 head silver against blue sky Silence room broke sustained ap plause Gentlemen give Lightning Letters Editor continued page 8 types airfoils However what else has considered thrust comes airfoil also windmill effect So actual pitch would angle back side would true lift angle airfoil instead would compromise two So would appear what have con sider descriptive number use differentiate between var ious propellers call pitch would better called model number practice used comparative purposes work remain comparable norm too must follow procedure though may theoretically correct interesting learn NACA done some work stream lined airfoils propellersapparently using same reasoning suggested prop articles good know seen improvement through use some sort symmetrical type airfoil Bills info Yes true some racing props reach 27K air also true explained article may very good practice due reaching speed range compressi bility probably number areas can explored find improvements along line such multi-bladed props Unfortunately competition purposes sort thing usually worked out restricted 2-bladed props practical reason work would have done other areas Sug gestions would use high-speed airfoils and/or sweepback portion blade subjected Mach speeds As prop production portion article indicated use templates prop blocks will put ballpark pitch blade widths Obviously final finishing should done some sort pitch gauge have pitch gauge instrument obviously use ful otherwise suggestion making template angles station will work well also also interesting know NACA done some work loca tion maximum blade width found some improvement using 38% product review product review product review 86 Model Aviation ultimate finishVW kote ciear S/p liquid goes over favorite paint & produces high gloss finish remarkably fuel resistant coat No mixing No short pot life Also fantastic Coverite COVERITE 2779 PHILMONT AVE HUNTINGOON VALLEY PA Norm Rosenstock Beam product review product review product review Glaskote Clear liquid goes over painted surface high-gloss fuel-resistant finish Flows like butter leaving no brush marks Mixing required no two parts no short pot life High percentage solids allows coat Dries quickly yet levels well Half-pint cans Coverite 2779 Philmont Ave Huntingdon Valley PA 19006 previous data indicated 60 66% ideal NACA data would indicate some work blade width location might bear some fruit Something else try hope readers will see letter has added worth what previously offered way pooled knowledge can make investigation easier interesting part believe recent prop work has discovered basis what could super prop Formula racing least results drastic change have very surprising enlightening Should dear editor see fit per haps will able pass findings along near future Harold deBolt Buffalo NY Mr deBolts letter responds earlier letter Bill Gieskienghe has seen Bills letter months column dear editor waffling won ders f world ready Harolds lat est findings unloading figures unbelievablediference between onground in-flight rpm ed also terrjfied sharpie Pylon guys sailplane designers wodld feel better some positive Pylon guys would try some deBolts earlier article revelations about itshould carry RC Technique/Myers continued page 16 item really wise treat care lessl Having stated problem its time suggest some solutions 1 Park shade 2 Cover windows keep out sunlight problem Greenhouse Effect Sunlight passes through glass heat interior car heated interior tries radiate its excess heat back out window cant because radiant energy frequency associated 60 -3 d U 1-50 -J 0 0 0 40 0 FE low temperature interior car much lower frequency sunlight glass black lower frequencies So heat stays car collects raising temperature convenient way dispose open windows let hot air carry away 3 If cant above perhaps can take batteries build ing Keeping cool objective 4 Failing should least test batteries before first flight 102030 DISCHARGE TIME IN MINUTES AVG 500 ma LOAD 40 50 Fig 6 Shows results testing several battery packs under various environmental conditions Name Address ______________Cly.........Slalo......Zp after flight Several manufacturers now offering built-in battery testers part transmitter Fig 4 shows Kraft Signature transmitter being used test batteries Quickee 500 Fig 5 shows Bridi expanded-scale voltmeter performing same service Similar ESM available Royal Electronics Craft Air EKLogictrol others devices place load battery simulates load operating system can use operating system load use LED low-voltage detectors such Power-Cyt Flite Lite Corleys CVI discussed column length January April issues 1976 What ever use test dont guess test let load hang batteries least 30 seconds may find voltage drops quite rapidly danger zone Batteries recuperate little get chance rest flash reading may very well wrong Since correct information best defense might want run few bat tery discharge tests Now dont believe discharging battery way down time recommended some battery discharge/time tester manu facturers does use up some life battery think test purpose establishing baseline condition good idea test what have may find some thing like Fig 6 Surprise battery October1978 87 Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple conSTERLING MODELS 0 ST PHILA PA 19134 Co dealet anarlablo dIrect Orders accepted tO oddrtoAal atruction Balsa Plywood parts accurately cOarge trandling shIpping 500 orinormon 0 US Sr 25 diecut precision vacuum formed Plastic hull andootsrde US - - Catalog entIre roe Ct arrplane corrrtot roe model kIts 0 C ocare cabin Hardware package including A/C hardware Full and Trainer kIts Seat model kIts accessorres etc 500 errcinosed sized Plans plus Decals Sport model coast- Secrets Model AIrplane Surldrog IncludIng desIgn OOnstroctlOn cooerlng trotstring trying adlustinog coorroin systems etc 250 Guard versionO Secret ot Contol Line Catrine Flying Inclodtng ytotlrgttt soloIng stunting Cartter rote ants regolatrons Carrine ttereg trrnts cootot line tostallatino rostroctrOns 250 enclosed Noottecks Only U S money Orders currency accepted O-NEWCELL700F NEW CELL 7O0FAFTER 2 DAYS IN CAR USED CELL 1300F AFTER 2 DAYS IN CAR