The thing modelers have com monother Thob itselfis flying session flying session happening No two fly-ins ever alike ingredients varied what see look through kids kaleidoscope Its fly-in see what others doing remarkable unique models watch others fly eye planes aloft meet make friends relaxand sometimes blow tops like Muppets Flyins banish worries renew spirits daily grind sunshine super fresh mown grass greener share products jillion lonely workshops perfect Spring evening gone few talented kibitzers distant site rolling Maryland countryside purpose make first flight thing called RC Spe cial Its 4/5 scale version rather pretty idealistic origi nal de signedandWalt Schroderbuiltand both us printed Mechanix Illustrated 1948 Let us note ol Walt fantastic builder draftsman end minutes silence Don Srull placed RC Scale 77 Nats made first flight Everybody flew us John Worth Don Hurst Bowers John Preston So far made complete flight out 13 logged Now strange thing RC guys cars loaded little rubber-powered scale models soon found out genuine fly-in dozen guysand couple hotshot kidsappeared soon evening air filled circling air craft descriptions Man pretty did fly Atone point Keith Rider Hughes Racer Folkerts cruised serenely overhead lolled grass little kid got bent-wing Corsair off startling long flight push-pull Dornier Mustang Gypsy Moth Howard Laird biplane Hellcat Douglas A-24 Albatros P-40 wentby dozens week later tried again again scale build ers out force dizzying stable subjects Now time too long ago low wings regarded impossibleand nine out ten fantastic ships could made fly So ask questions big difference weight Todays builder takes pride ability build light neatness precision does have fight high speeds Gs heavier powerful ships yes terday magnified small problems disaster less power required no uncontrollable power burst no torque bit touchup adjustment cant handle runs long smoothmore like door model virtually entire flight taken up prop run ship grass close turns run out hand-launch ship retracting gear flown gear up mode Anyone thinks rubber scale kids handful gimpy old gents behind times missing some thing already has built popular following thousands FO has visiting guys RCers Among found quite few re tired types reliving love affair ancient classic aircraft perception real air craft guys visit back forth spend evening low-key chitchat tales airplanes men gone flow endlessly fine points lam inating wing tip attaching strut painting adding too much weight Sometimes slides shown nothing find shop ten mar velous beauties hanging ceiling Ten nothingreally likely 20 30 50 Almost always models rub ber quite frequently theres schoolyard RC type scale ship 010 02 049 CO2 natural So wonder impossible modellike Royall Moores Gee Bee Silo flies 45 secondscan flown perfectly problems rubber powerwhen larger radio scale types still considered impossible subjects Only genius would tackle big RC version Doolittles Gee Bee Can such models become unbusted broncos apply controls maneuver weigh ton both Has RC modeler forgotten build light Most likely notion never occurs 99 out 100 us De signing model aircraft has become tradelike carpentry frame house frame airplane airplane house Gossamer Condor Rides Again double-titled Victorian novels Can Two Gossamer Condors Live Cheap er Maybe wed better begin begin ning Mr Henry Kremer English indus trialist long standing pounds-a bit offer 50000 less 100 grand space ers retired Auage buckswas gust 23 1977 ex-modeler Paul Mc Cready merry band ex-mod elers including Verne Oldershaw 1947 Nats winning Glory Bee pub lished AT guy did peddling has put up 100000 pounds about $190000 first persons fly person-powered air craft HPF human-powered aircraft across English Channel Several things immediately evident pedaled through preceding sentences should able pump airplane across Channel Mr Kremer has got ten fun bucks ahem pounds anyone since Wright Brothers finally expected prize will go unclaimed five years Writing June issue Soaring J H McMasters J D McLean both aerodynamicists Boeing present fas cinating evidence ability pedal Jellyfishus Aeronauticus over old Bleriot trail no means im Continued page 82 4 Model Aviation possible wacky sounds Con sider flight straight-line turn problems old Figure 8 coursewhich thwarted McCready bunchwill exist champion-caliber engine/pilot au thors say can being seriously distracted controlling machine develop about half horsepower minimum 10 minutes An average athlete can produce about 3 hp couple hours piloting HPA Indoor builders will fascinated discussion interplay drag-thrust lift-weight factors possible design trade-offs considered get bottom line dem onstrated machine best suited job Gossamer Condor two themrather like Twin Mustangwith huge common wing two men pedaling Didnt Germans put two Heinkel bombers together five engines serve multiple-glider tugs Two planes flying side side tips close together stated experi ence same sort power-required re duction typical HPA sees ground effect Several existing HPA already capable flying long distances ground effect So two pilots two en gines appealing prospect 2-place HPAs weigh 150 pounds have wing spans under 150 feet Twin Gossamer Condors would weigh togeth er 150 pounds empty would have span nearly 200 feet huge joined together wing re duced 140 feet empty weight 140 pounds theoretical design would seem viable solution according McMasters McLean McLean ex-holder Open Indoor Pennyplane record Illustrating Soaring article head-on sketch double Condor fuselage has outrigger struts mounted two propeliers typ ical twin fashion design ever built might show up 4-engine air craft Better make 4-prop. McCready incidentally expect ed arrive scene summer presumably proven one-man Gossamer Condor Perhaps attempt will have made time read takeoff high cliffs Dover would good begin ning As contributor Frank Scott sugges ted might put hungry sharks Channel Speaking historic RC models excellent plan Walt Goods Rud derbug appeared recent issue Model Builder Note did use term oldtimer vintage RCs fly like converted free flights terms power wing loading performance index roughly halfway between OTs modern cabin models sport low wings may few exceptions such Chet Lanzos pre-war parasol its wire-strutted center section poly hedral wings resembles FF OT really excellent RC airplanes past await discovery Old RC designs could next Klondikegold rush people begin fly compe tition will rear its ugly head Should spirit things preserved far 1/3 1/4 scale monsters Quarter Scale Association America has noncompetition policy under fliers get together just fly enjoy selves would manage competi tion Vintage RC designs Would 1950 appropriate point time qualify Vintage RC As far know no aileron ship flown datedo correct us Howard Bonners remarkable fullhouse Smog Hog cabin modelwhich ushered modern era post 1950 some promising aircraft exis ted long before 1950 Rockwood 3and 5-channel reed systems flew before war won Nationals after 1950 large Cub about 7-foot span rudder 2 elevator 2 engine control 1 Five channels did mean what means today channel gave direction servo say Up Down required two chan Peanutsize Profiles Three new offerings Miniprofile contest eventsHD 6 $225 Pietenpol Aircamper $197 Nesmith Cougar $1 79feature preprinted covering scale details like insignia wing ribs registration Color added marking pens no dope paint Vintage Aero 1 Glen Tenafly NJ 07670 product review product review product review 82 Model Aviation Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple con struction Balsa Plywood parts accurately die-cut precision vacuum formed Plastic hull cabin Hardware package including R/C hardware Full sized Plans plus Decals Sport model Coast Guard version STERLING MODELS G ST PHILA PA 19134 no dada aailabia d,ct odasacoavtad dditiOda chtga 0 SSoAIO Ittiaving 800 mn,non US ti 25 minhinunt votlida US V Catarog anti lit, 0 ipidoa cOntiOl ii, modvi kits v C scale Tatn kits boat modal hits aooassoivs vc SOC encloSOd V Saoats otModaiAiplanaBoilding lnotodingdestgvoonsttuotion ovaaing tinishing ttying tosting OOn,Oi syntents eto 250 noolosad U Saoas 09 Contvl tin Ca,e Fiyiog inolodrng peiigvi sotatag stunttoq Ca,a ulda tagolativnt Ca,iv flying bin, Oontvl Wa inatattatton instuctions 250 avolosad Nooveck Only U S mona0 odns ocu,anCyaooaytvd Name Addless ________________Cy.Statc ......Zp Openers continued page 4 product review product review product review nels time five channels max reed receiversmuch later would have eight channels two elevator two rudder two ailerons two engine trim added some times five control sticks required well after 1950 1940s Good Brothers rudder elevator using two receivers two escapementsthis added rudder-only Guff milestone air plane topped everything few years immediately preceeding war Walker Siegfried confused Sig elevator control before war would such aircraft compete against other today cannot thrown together some kind Tur key Shoot Historically rudder-and-ele vator jobs did compete against rudder although throughout great middle period RC subsequent 1953 until 1968rules written preserve rudder onlywhich competi tively phased out increasingly different interest Classes II III rudder rudder ele vator obvi ously Vintage rudder-only crates flown some rules should separate types number kinds control surfaces Since multiple channel systems existed before war post60s Classes II III setup might good way insure particular old RC jobs could compete against kind would seem appropriate yes teryears ships flown type say loosely equipment em ployed original ac tuator whatever perhaps should always have throttle make things interesting consider some designs crossed overlike rudder-only Beams flown elevator two chan nels No doubt diligent research old magazines will turn up such com binations Perhaps other making type distinctions rules should exact ly almost what old days adjusted post 1960 Classes 111 III arrangement same simple pattern Great fun special events clubs Although outline possible basis competition perhaps necessary evil FO does propose new event will flying machines future can best enjoy what would call thing Surely RC Old Timer already have rejuvenated free flights want handle weve called Vintage Radio Control Non-Modelers title unique book written Paul Kugler released fall Boynton Associates preparation 2 years tackles beginner problemwhich will always us entirely new way Envisioning need hobby shop means absolutely guarantee neophytewho may never have previous contact model construction flyinga system can step step construct successfully fly radio model book presents model called Per former explicit words per haps 500 how-to-do-it pictures guides customer success Thats mighty tall order vast array photos de pict things first pin glue joint covering plane Mono kote fly Like book plane design different has high aspect ratio allwood wingonly four main piecesthat spans 6 ft engine 049its reasoned public has greatest acquain tanceship size powerplant besides easiest cheapest use fuselage sheet balsa few pieces mind can conceive Tail surfaces sheet no land ing gearjust wire skid Two pieces wood form wing panel Jedelski fashion wide piece sheet glued September 1978 83 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NAT IONALS WINNERS HAVE USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 B4tter quality control better selection hard maple wood 3 The best finish completely fuelproof New Improved 1978 DIAPITCHPRICE 5%34as 63489 733/4119 83 3%456 129 8A77%139 a4565A 77%139 104567149 106W SW149 10SEW159 114677% 7%7%8159 11eEW1e9 ii67189 126179 125W179 1356239 1456279 1556349 164%6449 1756599 1856599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B POE SPEED NG ADVANCED DESIGN ND 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES RC pv LON RACING DIAPITCHPRICE 53%4129 756149 7SN SN149 6%6% 6% 7 7%7%159 977% 7%169 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 788%149 77%10%11169 689189 89N 9%N189 91213229 N NARROW wide formed leading edge such way cambered airfoil results Formed did say seems Midwest going manufacture kit book kit can recommended together dealer kit course contains shaped leading edge piece Midwest aware FOs sneak preview can say boys have religion Its daring imaginiative approach powered glider hotshots idea trainer must impressed revelations field testing involved very young kids Since two channels required rud der elevator flier involved four very natural stick move ments slow rate climb takes ever get ship real altitude no pressure new flier Control demands presented flier about pace molasses flow ing uphill January 11-year-old boy merely told what stick move ments launched model its first flight come down grass hadnt pushed hard enough launch second flight snagged wing tip grass cartwheeled damage third flight flew ship unaided 9minute flight Mountains words books kits magazines have shoved ginner yet problem big ever knows maybe guys have answer Letters Editor continued page 7 high performance propellers June 78 vol 4 #6 p 30 though pylon racers whatever are out province found deBolts article interesting provocative came away few misgivings think idea presented identical pitch can maintained substituting different types airfoils can very misleading can lead easily specious reasoning Determining pitch some arbitrary datum line seems largely matter choice merely lends itself fiat driving face standard pro peller section would think meaningful approach case would calculate pitch zero lift angle blade airfoil Since could much six seven degrees dif ference zero lift angles between sym metrical airfoil thick flat bottomed section would have big difference aerodynamic pitch also So does leave us would suggest setting propeller blade elements given lift coefficients design advance angles let pitch take care itself As point interest regarding use symmetrical airfoils propeller design recall NACA tests Navy pro peller speedy biconvex airfoil outer fifty percent developing standard airfoil inboard combination gave very high maximum efficiency climb acceleration poor Hal states widest part blade should near 6r station developed view planform seems put much closer hub would interested know came conclusion confuse issue mind NACA propeller compar ison test against standard propeller look ing much like Hals propeller giving highest maximum efficiency its max imum width around 38r nearly straight taper rounded tip gain 3% believe 3% gain propeller efficiency means 1% gain flight speed taken aback fact Hal turning nine inch diameter prop 27K common occurance tip speed well over 1000 per sec seems pushing full-scale metal pro peller ultra thin tip profile Its hard believe miniature pro peller its lower Reynolds Numbers wouldnt suffer severe loss efficiency have thought perhaps wrongly 900 sec about high could go thin carbon/epoxy props would like hear about com pressibility phenomena relates model props. ld pylon racers going three bladed props anticipate part #2 Hals article would like pass warning carving own props Dont depend alone template markings give anticipated blade angle looks good paper small errors creep can really screw things up Recently went through batches old props carved using markings shocked find times off original design intentions Simple angle templates made stiff paper file cards folders etc will make sure have right finally sure balance prop enough balance hori zontally t balanced vertical axis well As friend put tend four bladed prop balance phantom blades Bill Gieskieng Jr Denver CO About Interplane Struts know anyone has called attention plans Comedian July 1976 Henry Farrell #149 have process building Have run trouble plans Everything going along nicely until made interplane struts trouble developed Either cabane struts too short interplane struts too long 84 Model Aviation THE LEADER IN COMPETITION PROPELLERS SPECIAL PRO SERIES 2 FOR ROFREE FLIGHT CONTROL LINE
Edition: Model Aviation - 1978/09
Page Numbers: 4, 82, 83, 84
The thing modelers have com monother Thob itselfis flying session flying session happening No two fly-ins ever alike ingredients varied what see look through kids kaleidoscope Its fly-in see what others doing remarkable unique models watch others fly eye planes aloft meet make friends relaxand sometimes blow tops like Muppets Flyins banish worries renew spirits daily grind sunshine super fresh mown grass greener share products jillion lonely workshops perfect Spring evening gone few talented kibitzers distant site rolling Maryland countryside purpose make first flight thing called RC Spe cial Its 4/5 scale version rather pretty idealistic origi nal de signedandWalt Schroderbuiltand both us printed Mechanix Illustrated 1948 Let us note ol Walt fantastic builder draftsman end minutes silence Don Srull placed RC Scale 77 Nats made first flight Everybody flew us John Worth Don Hurst Bowers John Preston So far made complete flight out 13 logged Now strange thing RC guys cars loaded little rubber-powered scale models soon found out genuine fly-in dozen guysand couple hotshot kidsappeared soon evening air filled circling air craft descriptions Man pretty did fly Atone point Keith Rider Hughes Racer Folkerts cruised serenely overhead lolled grass little kid got bent-wing Corsair off startling long flight push-pull Dornier Mustang Gypsy Moth Howard Laird biplane Hellcat Douglas A-24 Albatros P-40 wentby dozens week later tried again again scale build ers out force dizzying stable subjects Now time too long ago low wings regarded impossibleand nine out ten fantastic ships could made fly So ask questions big difference weight Todays builder takes pride ability build light neatness precision does have fight high speeds Gs heavier powerful ships yes terday magnified small problems disaster less power required no uncontrollable power burst no torque bit touchup adjustment cant handle runs long smoothmore like door model virtually entire flight taken up prop run ship grass close turns run out hand-launch ship retracting gear flown gear up mode Anyone thinks rubber scale kids handful gimpy old gents behind times missing some thing already has built popular following thousands FO has visiting guys RCers Among found quite few re tired types reliving love affair ancient classic aircraft perception real air craft guys visit back forth spend evening low-key chitchat tales airplanes men gone flow endlessly fine points lam inating wing tip attaching strut painting adding too much weight Sometimes slides shown nothing find shop ten mar velous beauties hanging ceiling Ten nothingreally likely 20 30 50 Almost always models rub ber quite frequently theres schoolyard RC type scale ship 010 02 049 CO2 natural So wonder impossible modellike Royall Moores Gee Bee Silo flies 45 secondscan flown perfectly problems rubber powerwhen larger radio scale types still considered impossible subjects Only genius would tackle big RC version Doolittles Gee Bee Can such models become unbusted broncos apply controls maneuver weigh ton both Has RC modeler forgotten build light Most likely notion never occurs 99 out 100 us De signing model aircraft has become tradelike carpentry frame house frame airplane airplane house Gossamer Condor Rides Again double-titled Victorian novels Can Two Gossamer Condors Live Cheap er Maybe wed better begin begin ning Mr Henry Kremer English indus trialist long standing pounds-a bit offer 50000 less 100 grand space ers retired Auage buckswas gust 23 1977 ex-modeler Paul Mc Cready merry band ex-mod elers including Verne Oldershaw 1947 Nats winning Glory Bee pub lished AT guy did peddling has put up 100000 pounds about $190000 first persons fly person-powered air craft HPF human-powered aircraft across English Channel Several things immediately evident pedaled through preceding sentences should able pump airplane across Channel Mr Kremer has got ten fun bucks ahem pounds anyone since Wright Brothers finally expected prize will go unclaimed five years Writing June issue Soaring J H McMasters J D McLean both aerodynamicists Boeing present fas cinating evidence ability pedal Jellyfishus Aeronauticus over old Bleriot trail no means im Continued page 82 4 Model Aviation possible wacky sounds Con sider flight straight-line turn problems old Figure 8 coursewhich thwarted McCready bunchwill exist champion-caliber engine/pilot au thors say can being seriously distracted controlling machine develop about half horsepower minimum 10 minutes An average athlete can produce about 3 hp couple hours piloting HPA Indoor builders will fascinated discussion interplay drag-thrust lift-weight factors possible design trade-offs considered get bottom line dem onstrated machine best suited job Gossamer Condor two themrather like Twin Mustangwith huge common wing two men pedaling Didnt Germans put two Heinkel bombers together five engines serve multiple-glider tugs Two planes flying side side tips close together stated experi ence same sort power-required re duction typical HPA sees ground effect Several existing HPA already capable flying long distances ground effect So two pilots two en gines appealing prospect 2-place HPAs weigh 150 pounds have wing spans under 150 feet Twin Gossamer Condors would weigh togeth er 150 pounds empty would have span nearly 200 feet huge joined together wing re duced 140 feet empty weight 140 pounds theoretical design would seem viable solution according McMasters McLean McLean ex-holder Open Indoor Pennyplane record Illustrating Soaring article head-on sketch double Condor fuselage has outrigger struts mounted two propeliers typ ical twin fashion design ever built might show up 4-engine air craft Better make 4-prop. McCready incidentally expect ed arrive scene summer presumably proven one-man Gossamer Condor Perhaps attempt will have made time read takeoff high cliffs Dover would good begin ning As contributor Frank Scott sugges ted might put hungry sharks Channel Speaking historic RC models excellent plan Walt Goods Rud derbug appeared recent issue Model Builder Note did use term oldtimer vintage RCs fly like converted free flights terms power wing loading performance index roughly halfway between OTs modern cabin models sport low wings may few exceptions such Chet Lanzos pre-war parasol its wire-strutted center section poly hedral wings resembles FF OT really excellent RC airplanes past await discovery Old RC designs could next Klondikegold rush people begin fly compe tition will rear its ugly head Should spirit things preserved far 1/3 1/4 scale monsters Quarter Scale Association America has noncompetition policy under fliers get together just fly enjoy selves would manage competi tion Vintage RC designs Would 1950 appropriate point time qualify Vintage RC As far know no aileron ship flown datedo correct us Howard Bonners remarkable fullhouse Smog Hog cabin modelwhich ushered modern era post 1950 some promising aircraft exis ted long before 1950 Rockwood 3and 5-channel reed systems flew before war won Nationals after 1950 large Cub about 7-foot span rudder 2 elevator 2 engine control 1 Five channels did mean what means today channel gave direction servo say Up Down required two chan Peanutsize Profiles Three new offerings Miniprofile contest eventsHD 6 $225 Pietenpol Aircamper $197 Nesmith Cougar $1 79feature preprinted covering scale details like insignia wing ribs registration Color added marking pens no dope paint Vintage Aero 1 Glen Tenafly NJ 07670 product review product review product review 82 Model Aviation Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple con struction Balsa Plywood parts accurately die-cut precision vacuum formed Plastic hull cabin Hardware package including R/C hardware Full sized Plans plus Decals Sport model Coast Guard version STERLING MODELS G ST PHILA PA 19134 no dada aailabia d,ct odasacoavtad dditiOda chtga 0 SSoAIO Ittiaving 800 mn,non US ti 25 minhinunt votlida US V Catarog anti lit, 0 ipidoa cOntiOl ii, modvi kits v C scale Tatn kits boat modal hits aooassoivs vc SOC encloSOd V Saoats otModaiAiplanaBoilding lnotodingdestgvoonsttuotion ovaaing tinishing ttying tosting OOn,Oi syntents eto 250 noolosad U Saoas 09 Contvl tin Ca,e Fiyiog inolodrng peiigvi sotatag stunttoq Ca,a ulda tagolativnt Ca,iv flying bin, Oontvl Wa inatattatton instuctions 250 avolosad Nooveck Only U S mona0 odns ocu,anCyaooaytvd Name Addless ________________Cy.Statc ......Zp Openers continued page 4 product review product review product review nels time five channels max reed receiversmuch later would have eight channels two elevator two rudder two ailerons two engine trim added some times five control sticks required well after 1950 1940s Good Brothers rudder elevator using two receivers two escapementsthis added rudder-only Guff milestone air plane topped everything few years immediately preceeding war Walker Siegfried confused Sig elevator control before war would such aircraft compete against other today cannot thrown together some kind Tur key Shoot Historically rudder-and-ele vator jobs did compete against rudder although throughout great middle period RC subsequent 1953 until 1968rules written preserve rudder onlywhich competi tively phased out increasingly different interest Classes II III rudder rudder ele vator obvi ously Vintage rudder-only crates flown some rules should separate types number kinds control surfaces Since multiple channel systems existed before war post60s Classes II III setup might good way insure particular old RC jobs could compete against kind would seem appropriate yes teryears ships flown type say loosely equipment em ployed original ac tuator whatever perhaps should always have throttle make things interesting consider some designs crossed overlike rudder-only Beams flown elevator two chan nels No doubt diligent research old magazines will turn up such com binations Perhaps other making type distinctions rules should exact ly almost what old days adjusted post 1960 Classes 111 III arrangement same simple pattern Great fun special events clubs Although outline possible basis competition perhaps necessary evil FO does propose new event will flying machines future can best enjoy what would call thing Surely RC Old Timer already have rejuvenated free flights want handle weve called Vintage Radio Control Non-Modelers title unique book written Paul Kugler released fall Boynton Associates preparation 2 years tackles beginner problemwhich will always us entirely new way Envisioning need hobby shop means absolutely guarantee neophytewho may never have previous contact model construction flyinga system can step step construct successfully fly radio model book presents model called Per former explicit words per haps 500 how-to-do-it pictures guides customer success Thats mighty tall order vast array photos de pict things first pin glue joint covering plane Mono kote fly Like book plane design different has high aspect ratio allwood wingonly four main piecesthat spans 6 ft engine 049its reasoned public has greatest acquain tanceship size powerplant besides easiest cheapest use fuselage sheet balsa few pieces mind can conceive Tail surfaces sheet no land ing gearjust wire skid Two pieces wood form wing panel Jedelski fashion wide piece sheet glued September 1978 83 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NAT IONALS WINNERS HAVE USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 B4tter quality control better selection hard maple wood 3 The best finish completely fuelproof New Improved 1978 DIAPITCHPRICE 5%34as 63489 733/4119 83 3%456 129 8A77%139 a4565A 77%139 104567149 106W SW149 10SEW159 114677% 7%7%8159 11eEW1e9 ii67189 126179 125W179 1356239 1456279 1556349 164%6449 1756599 1856599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B POE SPEED NG ADVANCED DESIGN ND 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES RC pv LON RACING DIAPITCHPRICE 53%4129 756149 7SN SN149 6%6% 6% 7 7%7%159 977% 7%169 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 788%149 77%10%11169 689189 89N 9%N189 91213229 N NARROW wide formed leading edge such way cambered airfoil results Formed did say seems Midwest going manufacture kit book kit can recommended together dealer kit course contains shaped leading edge piece Midwest aware FOs sneak preview can say boys have religion Its daring imaginiative approach powered glider hotshots idea trainer must impressed revelations field testing involved very young kids Since two channels required rud der elevator flier involved four very natural stick move ments slow rate climb takes ever get ship real altitude no pressure new flier Control demands presented flier about pace molasses flow ing uphill January 11-year-old boy merely told what stick move ments launched model its first flight come down grass hadnt pushed hard enough launch second flight snagged wing tip grass cartwheeled damage third flight flew ship unaided 9minute flight Mountains words books kits magazines have shoved ginner yet problem big ever knows maybe guys have answer Letters Editor continued page 7 high performance propellers June 78 vol 4 #6 p 30 though pylon racers whatever are out province found deBolts article interesting provocative came away few misgivings think idea presented identical pitch can maintained substituting different types airfoils can very misleading can lead easily specious reasoning Determining pitch some arbitrary datum line seems largely matter choice merely lends itself fiat driving face standard pro peller section would think meaningful approach case would calculate pitch zero lift angle blade airfoil Since could much six seven degrees dif ference zero lift angles between sym metrical airfoil thick flat bottomed section would have big difference aerodynamic pitch also So does leave us would suggest setting propeller blade elements given lift coefficients design advance angles let pitch take care itself As point interest regarding use symmetrical airfoils propeller design recall NACA tests Navy pro peller speedy biconvex airfoil outer fifty percent developing standard airfoil inboard combination gave very high maximum efficiency climb acceleration poor Hal states widest part blade should near 6r station developed view planform seems put much closer hub would interested know came conclusion confuse issue mind NACA propeller compar ison test against standard propeller look ing much like Hals propeller giving highest maximum efficiency its max imum width around 38r nearly straight taper rounded tip gain 3% believe 3% gain propeller efficiency means 1% gain flight speed taken aback fact Hal turning nine inch diameter prop 27K common occurance tip speed well over 1000 per sec seems pushing full-scale metal pro peller ultra thin tip profile Its hard believe miniature pro peller its lower Reynolds Numbers wouldnt suffer severe loss efficiency have thought perhaps wrongly 900 sec about high could go thin carbon/epoxy props would like hear about com pressibility phenomena relates model props. ld pylon racers going three bladed props anticipate part #2 Hals article would like pass warning carving own props Dont depend alone template markings give anticipated blade angle looks good paper small errors creep can really screw things up Recently went through batches old props carved using markings shocked find times off original design intentions Simple angle templates made stiff paper file cards folders etc will make sure have right finally sure balance prop enough balance hori zontally t balanced vertical axis well As friend put tend four bladed prop balance phantom blades Bill Gieskieng Jr Denver CO About Interplane Struts know anyone has called attention plans Comedian July 1976 Henry Farrell #149 have process building Have run trouble plans Everything going along nicely until made interplane struts trouble developed Either cabane struts too short interplane struts too long 84 Model Aviation THE LEADER IN COMPETITION PROPELLERS SPECIAL PRO SERIES 2 FOR ROFREE FLIGHT CONTROL LINE
Edition: Model Aviation - 1978/09
Page Numbers: 4, 82, 83, 84
The thing modelers have com monother Thob itselfis flying session flying session happening No two fly-ins ever alike ingredients varied what see look through kids kaleidoscope Its fly-in see what others doing remarkable unique models watch others fly eye planes aloft meet make friends relaxand sometimes blow tops like Muppets Flyins banish worries renew spirits daily grind sunshine super fresh mown grass greener share products jillion lonely workshops perfect Spring evening gone few talented kibitzers distant site rolling Maryland countryside purpose make first flight thing called RC Spe cial Its 4/5 scale version rather pretty idealistic origi nal de signedandWalt Schroderbuiltand both us printed Mechanix Illustrated 1948 Let us note ol Walt fantastic builder draftsman end minutes silence Don Srull placed RC Scale 77 Nats made first flight Everybody flew us John Worth Don Hurst Bowers John Preston So far made complete flight out 13 logged Now strange thing RC guys cars loaded little rubber-powered scale models soon found out genuine fly-in dozen guysand couple hotshot kidsappeared soon evening air filled circling air craft descriptions Man pretty did fly Atone point Keith Rider Hughes Racer Folkerts cruised serenely overhead lolled grass little kid got bent-wing Corsair off startling long flight push-pull Dornier Mustang Gypsy Moth Howard Laird biplane Hellcat Douglas A-24 Albatros P-40 wentby dozens week later tried again again scale build ers out force dizzying stable subjects Now time too long ago low wings regarded impossibleand nine out ten fantastic ships could made fly So ask questions big difference weight Todays builder takes pride ability build light neatness precision does have fight high speeds Gs heavier powerful ships yes terday magnified small problems disaster less power required no uncontrollable power burst no torque bit touchup adjustment cant handle runs long smoothmore like door model virtually entire flight taken up prop run ship grass close turns run out hand-launch ship retracting gear flown gear up mode Anyone thinks rubber scale kids handful gimpy old gents behind times missing some thing already has built popular following thousands FO has visiting guys RCers Among found quite few re tired types reliving love affair ancient classic aircraft perception real air craft guys visit back forth spend evening low-key chitchat tales airplanes men gone flow endlessly fine points lam inating wing tip attaching strut painting adding too much weight Sometimes slides shown nothing find shop ten mar velous beauties hanging ceiling Ten nothingreally likely 20 30 50 Almost always models rub ber quite frequently theres schoolyard RC type scale ship 010 02 049 CO2 natural So wonder impossible modellike Royall Moores Gee Bee Silo flies 45 secondscan flown perfectly problems rubber powerwhen larger radio scale types still considered impossible subjects Only genius would tackle big RC version Doolittles Gee Bee Can such models become unbusted broncos apply controls maneuver weigh ton both Has RC modeler forgotten build light Most likely notion never occurs 99 out 100 us De signing model aircraft has become tradelike carpentry frame house frame airplane airplane house Gossamer Condor Rides Again double-titled Victorian novels Can Two Gossamer Condors Live Cheap er Maybe wed better begin begin ning Mr Henry Kremer English indus trialist long standing pounds-a bit offer 50000 less 100 grand space ers retired Auage buckswas gust 23 1977 ex-modeler Paul Mc Cready merry band ex-mod elers including Verne Oldershaw 1947 Nats winning Glory Bee pub lished AT guy did peddling has put up 100000 pounds about $190000 first persons fly person-powered air craft HPF human-powered aircraft across English Channel Several things immediately evident pedaled through preceding sentences should able pump airplane across Channel Mr Kremer has got ten fun bucks ahem pounds anyone since Wright Brothers finally expected prize will go unclaimed five years Writing June issue Soaring J H McMasters J D McLean both aerodynamicists Boeing present fas cinating evidence ability pedal Jellyfishus Aeronauticus over old Bleriot trail no means im Continued page 82 4 Model Aviation possible wacky sounds Con sider flight straight-line turn problems old Figure 8 coursewhich thwarted McCready bunchwill exist champion-caliber engine/pilot au thors say can being seriously distracted controlling machine develop about half horsepower minimum 10 minutes An average athlete can produce about 3 hp couple hours piloting HPA Indoor builders will fascinated discussion interplay drag-thrust lift-weight factors possible design trade-offs considered get bottom line dem onstrated machine best suited job Gossamer Condor two themrather like Twin Mustangwith huge common wing two men pedaling Didnt Germans put two Heinkel bombers together five engines serve multiple-glider tugs Two planes flying side side tips close together stated experi ence same sort power-required re duction typical HPA sees ground effect Several existing HPA already capable flying long distances ground effect So two pilots two en gines appealing prospect 2-place HPAs weigh 150 pounds have wing spans under 150 feet Twin Gossamer Condors would weigh togeth er 150 pounds empty would have span nearly 200 feet huge joined together wing re duced 140 feet empty weight 140 pounds theoretical design would seem viable solution according McMasters McLean McLean ex-holder Open Indoor Pennyplane record Illustrating Soaring article head-on sketch double Condor fuselage has outrigger struts mounted two propeliers typ ical twin fashion design ever built might show up 4-engine air craft Better make 4-prop. McCready incidentally expect ed arrive scene summer presumably proven one-man Gossamer Condor Perhaps attempt will have made time read takeoff high cliffs Dover would good begin ning As contributor Frank Scott sugges ted might put hungry sharks Channel Speaking historic RC models excellent plan Walt Goods Rud derbug appeared recent issue Model Builder Note did use term oldtimer vintage RCs fly like converted free flights terms power wing loading performance index roughly halfway between OTs modern cabin models sport low wings may few exceptions such Chet Lanzos pre-war parasol its wire-strutted center section poly hedral wings resembles FF OT really excellent RC airplanes past await discovery Old RC designs could next Klondikegold rush people begin fly compe tition will rear its ugly head Should spirit things preserved far 1/3 1/4 scale monsters Quarter Scale Association America has noncompetition policy under fliers get together just fly enjoy selves would manage competi tion Vintage RC designs Would 1950 appropriate point time qualify Vintage RC As far know no aileron ship flown datedo correct us Howard Bonners remarkable fullhouse Smog Hog cabin modelwhich ushered modern era post 1950 some promising aircraft exis ted long before 1950 Rockwood 3and 5-channel reed systems flew before war won Nationals after 1950 large Cub about 7-foot span rudder 2 elevator 2 engine control 1 Five channels did mean what means today channel gave direction servo say Up Down required two chan Peanutsize Profiles Three new offerings Miniprofile contest eventsHD 6 $225 Pietenpol Aircamper $197 Nesmith Cougar $1 79feature preprinted covering scale details like insignia wing ribs registration Color added marking pens no dope paint Vintage Aero 1 Glen Tenafly NJ 07670 product review product review product review 82 Model Aviation Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple con struction Balsa Plywood parts accurately die-cut precision vacuum formed Plastic hull cabin Hardware package including R/C hardware Full sized Plans plus Decals Sport model Coast Guard version STERLING MODELS G ST PHILA PA 19134 no dada aailabia d,ct odasacoavtad dditiOda chtga 0 SSoAIO Ittiaving 800 mn,non US ti 25 minhinunt votlida US V Catarog anti lit, 0 ipidoa cOntiOl ii, modvi kits v C scale Tatn kits boat modal hits aooassoivs vc SOC encloSOd V Saoats otModaiAiplanaBoilding lnotodingdestgvoonsttuotion ovaaing tinishing ttying tosting OOn,Oi syntents eto 250 noolosad U Saoas 09 Contvl tin Ca,e Fiyiog inolodrng peiigvi sotatag stunttoq Ca,a ulda tagolativnt Ca,iv flying bin, Oontvl Wa inatattatton instuctions 250 avolosad Nooveck Only U S mona0 odns ocu,anCyaooaytvd Name Addless ________________Cy.Statc ......Zp Openers continued page 4 product review product review product review nels time five channels max reed receiversmuch later would have eight channels two elevator two rudder two ailerons two engine trim added some times five control sticks required well after 1950 1940s Good Brothers rudder elevator using two receivers two escapementsthis added rudder-only Guff milestone air plane topped everything few years immediately preceeding war Walker Siegfried confused Sig elevator control before war would such aircraft compete against other today cannot thrown together some kind Tur key Shoot Historically rudder-and-ele vator jobs did compete against rudder although throughout great middle period RC subsequent 1953 until 1968rules written preserve rudder onlywhich competi tively phased out increasingly different interest Classes II III rudder rudder ele vator obvi ously Vintage rudder-only crates flown some rules should separate types number kinds control surfaces Since multiple channel systems existed before war post60s Classes II III setup might good way insure particular old RC jobs could compete against kind would seem appropriate yes teryears ships flown type say loosely equipment em ployed original ac tuator whatever perhaps should always have throttle make things interesting consider some designs crossed overlike rudder-only Beams flown elevator two chan nels No doubt diligent research old magazines will turn up such com binations Perhaps other making type distinctions rules should exact ly almost what old days adjusted post 1960 Classes 111 III arrangement same simple pattern Great fun special events clubs Although outline possible basis competition perhaps necessary evil FO does propose new event will flying machines future can best enjoy what would call thing Surely RC Old Timer already have rejuvenated free flights want handle weve called Vintage Radio Control Non-Modelers title unique book written Paul Kugler released fall Boynton Associates preparation 2 years tackles beginner problemwhich will always us entirely new way Envisioning need hobby shop means absolutely guarantee neophytewho may never have previous contact model construction flyinga system can step step construct successfully fly radio model book presents model called Per former explicit words per haps 500 how-to-do-it pictures guides customer success Thats mighty tall order vast array photos de pict things first pin glue joint covering plane Mono kote fly Like book plane design different has high aspect ratio allwood wingonly four main piecesthat spans 6 ft engine 049its reasoned public has greatest acquain tanceship size powerplant besides easiest cheapest use fuselage sheet balsa few pieces mind can conceive Tail surfaces sheet no land ing gearjust wire skid Two pieces wood form wing panel Jedelski fashion wide piece sheet glued September 1978 83 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NAT IONALS WINNERS HAVE USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 B4tter quality control better selection hard maple wood 3 The best finish completely fuelproof New Improved 1978 DIAPITCHPRICE 5%34as 63489 733/4119 83 3%456 129 8A77%139 a4565A 77%139 104567149 106W SW149 10SEW159 114677% 7%7%8159 11eEW1e9 ii67189 126179 125W179 1356239 1456279 1556349 164%6449 1756599 1856599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B POE SPEED NG ADVANCED DESIGN ND 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES RC pv LON RACING DIAPITCHPRICE 53%4129 756149 7SN SN149 6%6% 6% 7 7%7%159 977% 7%169 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 788%149 77%10%11169 689189 89N 9%N189 91213229 N NARROW wide formed leading edge such way cambered airfoil results Formed did say seems Midwest going manufacture kit book kit can recommended together dealer kit course contains shaped leading edge piece Midwest aware FOs sneak preview can say boys have religion Its daring imaginiative approach powered glider hotshots idea trainer must impressed revelations field testing involved very young kids Since two channels required rud der elevator flier involved four very natural stick move ments slow rate climb takes ever get ship real altitude no pressure new flier Control demands presented flier about pace molasses flow ing uphill January 11-year-old boy merely told what stick move ments launched model its first flight come down grass hadnt pushed hard enough launch second flight snagged wing tip grass cartwheeled damage third flight flew ship unaided 9minute flight Mountains words books kits magazines have shoved ginner yet problem big ever knows maybe guys have answer Letters Editor continued page 7 high performance propellers June 78 vol 4 #6 p 30 though pylon racers whatever are out province found deBolts article interesting provocative came away few misgivings think idea presented identical pitch can maintained substituting different types airfoils can very misleading can lead easily specious reasoning Determining pitch some arbitrary datum line seems largely matter choice merely lends itself fiat driving face standard pro peller section would think meaningful approach case would calculate pitch zero lift angle blade airfoil Since could much six seven degrees dif ference zero lift angles between sym metrical airfoil thick flat bottomed section would have big difference aerodynamic pitch also So does leave us would suggest setting propeller blade elements given lift coefficients design advance angles let pitch take care itself As point interest regarding use symmetrical airfoils propeller design recall NACA tests Navy pro peller speedy biconvex airfoil outer fifty percent developing standard airfoil inboard combination gave very high maximum efficiency climb acceleration poor Hal states widest part blade should near 6r station developed view planform seems put much closer hub would interested know came conclusion confuse issue mind NACA propeller compar ison test against standard propeller look ing much like Hals propeller giving highest maximum efficiency its max imum width around 38r nearly straight taper rounded tip gain 3% believe 3% gain propeller efficiency means 1% gain flight speed taken aback fact Hal turning nine inch diameter prop 27K common occurance tip speed well over 1000 per sec seems pushing full-scale metal pro peller ultra thin tip profile Its hard believe miniature pro peller its lower Reynolds Numbers wouldnt suffer severe loss efficiency have thought perhaps wrongly 900 sec about high could go thin carbon/epoxy props would like hear about com pressibility phenomena relates model props. ld pylon racers going three bladed props anticipate part #2 Hals article would like pass warning carving own props Dont depend alone template markings give anticipated blade angle looks good paper small errors creep can really screw things up Recently went through batches old props carved using markings shocked find times off original design intentions Simple angle templates made stiff paper file cards folders etc will make sure have right finally sure balance prop enough balance hori zontally t balanced vertical axis well As friend put tend four bladed prop balance phantom blades Bill Gieskieng Jr Denver CO About Interplane Struts know anyone has called attention plans Comedian July 1976 Henry Farrell #149 have process building Have run trouble plans Everything going along nicely until made interplane struts trouble developed Either cabane struts too short interplane struts too long 84 Model Aviation THE LEADER IN COMPETITION PROPELLERS SPECIAL PRO SERIES 2 FOR ROFREE FLIGHT CONTROL LINE
Edition: Model Aviation - 1978/09
Page Numbers: 4, 82, 83, 84
The thing modelers have com monother Thob itselfis flying session flying session happening No two fly-ins ever alike ingredients varied what see look through kids kaleidoscope Its fly-in see what others doing remarkable unique models watch others fly eye planes aloft meet make friends relaxand sometimes blow tops like Muppets Flyins banish worries renew spirits daily grind sunshine super fresh mown grass greener share products jillion lonely workshops perfect Spring evening gone few talented kibitzers distant site rolling Maryland countryside purpose make first flight thing called RC Spe cial Its 4/5 scale version rather pretty idealistic origi nal de signedandWalt Schroderbuiltand both us printed Mechanix Illustrated 1948 Let us note ol Walt fantastic builder draftsman end minutes silence Don Srull placed RC Scale 77 Nats made first flight Everybody flew us John Worth Don Hurst Bowers John Preston So far made complete flight out 13 logged Now strange thing RC guys cars loaded little rubber-powered scale models soon found out genuine fly-in dozen guysand couple hotshot kidsappeared soon evening air filled circling air craft descriptions Man pretty did fly Atone point Keith Rider Hughes Racer Folkerts cruised serenely overhead lolled grass little kid got bent-wing Corsair off startling long flight push-pull Dornier Mustang Gypsy Moth Howard Laird biplane Hellcat Douglas A-24 Albatros P-40 wentby dozens week later tried again again scale build ers out force dizzying stable subjects Now time too long ago low wings regarded impossibleand nine out ten fantastic ships could made fly So ask questions big difference weight Todays builder takes pride ability build light neatness precision does have fight high speeds Gs heavier powerful ships yes terday magnified small problems disaster less power required no uncontrollable power burst no torque bit touchup adjustment cant handle runs long smoothmore like door model virtually entire flight taken up prop run ship grass close turns run out hand-launch ship retracting gear flown gear up mode Anyone thinks rubber scale kids handful gimpy old gents behind times missing some thing already has built popular following thousands FO has visiting guys RCers Among found quite few re tired types reliving love affair ancient classic aircraft perception real air craft guys visit back forth spend evening low-key chitchat tales airplanes men gone flow endlessly fine points lam inating wing tip attaching strut painting adding too much weight Sometimes slides shown nothing find shop ten mar velous beauties hanging ceiling Ten nothingreally likely 20 30 50 Almost always models rub ber quite frequently theres schoolyard RC type scale ship 010 02 049 CO2 natural So wonder impossible modellike Royall Moores Gee Bee Silo flies 45 secondscan flown perfectly problems rubber powerwhen larger radio scale types still considered impossible subjects Only genius would tackle big RC version Doolittles Gee Bee Can such models become unbusted broncos apply controls maneuver weigh ton both Has RC modeler forgotten build light Most likely notion never occurs 99 out 100 us De signing model aircraft has become tradelike carpentry frame house frame airplane airplane house Gossamer Condor Rides Again double-titled Victorian novels Can Two Gossamer Condors Live Cheap er Maybe wed better begin begin ning Mr Henry Kremer English indus trialist long standing pounds-a bit offer 50000 less 100 grand space ers retired Auage buckswas gust 23 1977 ex-modeler Paul Mc Cready merry band ex-mod elers including Verne Oldershaw 1947 Nats winning Glory Bee pub lished AT guy did peddling has put up 100000 pounds about $190000 first persons fly person-powered air craft HPF human-powered aircraft across English Channel Several things immediately evident pedaled through preceding sentences should able pump airplane across Channel Mr Kremer has got ten fun bucks ahem pounds anyone since Wright Brothers finally expected prize will go unclaimed five years Writing June issue Soaring J H McMasters J D McLean both aerodynamicists Boeing present fas cinating evidence ability pedal Jellyfishus Aeronauticus over old Bleriot trail no means im Continued page 82 4 Model Aviation possible wacky sounds Con sider flight straight-line turn problems old Figure 8 coursewhich thwarted McCready bunchwill exist champion-caliber engine/pilot au thors say can being seriously distracted controlling machine develop about half horsepower minimum 10 minutes An average athlete can produce about 3 hp couple hours piloting HPA Indoor builders will fascinated discussion interplay drag-thrust lift-weight factors possible design trade-offs considered get bottom line dem onstrated machine best suited job Gossamer Condor two themrather like Twin Mustangwith huge common wing two men pedaling Didnt Germans put two Heinkel bombers together five engines serve multiple-glider tugs Two planes flying side side tips close together stated experi ence same sort power-required re duction typical HPA sees ground effect Several existing HPA already capable flying long distances ground effect So two pilots two en gines appealing prospect 2-place HPAs weigh 150 pounds have wing spans under 150 feet Twin Gossamer Condors would weigh togeth er 150 pounds empty would have span nearly 200 feet huge joined together wing re duced 140 feet empty weight 140 pounds theoretical design would seem viable solution according McMasters McLean McLean ex-holder Open Indoor Pennyplane record Illustrating Soaring article head-on sketch double Condor fuselage has outrigger struts mounted two propeliers typ ical twin fashion design ever built might show up 4-engine air craft Better make 4-prop. McCready incidentally expect ed arrive scene summer presumably proven one-man Gossamer Condor Perhaps attempt will have made time read takeoff high cliffs Dover would good begin ning As contributor Frank Scott sugges ted might put hungry sharks Channel Speaking historic RC models excellent plan Walt Goods Rud derbug appeared recent issue Model Builder Note did use term oldtimer vintage RCs fly like converted free flights terms power wing loading performance index roughly halfway between OTs modern cabin models sport low wings may few exceptions such Chet Lanzos pre-war parasol its wire-strutted center section poly hedral wings resembles FF OT really excellent RC airplanes past await discovery Old RC designs could next Klondikegold rush people begin fly compe tition will rear its ugly head Should spirit things preserved far 1/3 1/4 scale monsters Quarter Scale Association America has noncompetition policy under fliers get together just fly enjoy selves would manage competi tion Vintage RC designs Would 1950 appropriate point time qualify Vintage RC As far know no aileron ship flown datedo correct us Howard Bonners remarkable fullhouse Smog Hog cabin modelwhich ushered modern era post 1950 some promising aircraft exis ted long before 1950 Rockwood 3and 5-channel reed systems flew before war won Nationals after 1950 large Cub about 7-foot span rudder 2 elevator 2 engine control 1 Five channels did mean what means today channel gave direction servo say Up Down required two chan Peanutsize Profiles Three new offerings Miniprofile contest eventsHD 6 $225 Pietenpol Aircamper $197 Nesmith Cougar $1 79feature preprinted covering scale details like insignia wing ribs registration Color added marking pens no dope paint Vintage Aero 1 Glen Tenafly NJ 07670 product review product review product review 82 Model Aviation Designed 2 channel R/C tether control 15 35 engines Maintaining top quality simple con struction Balsa Plywood parts accurately die-cut precision vacuum formed Plastic hull cabin Hardware package including R/C hardware Full sized Plans plus Decals Sport model Coast Guard version STERLING MODELS G ST PHILA PA 19134 no dada aailabia d,ct odasacoavtad dditiOda chtga 0 SSoAIO Ittiaving 800 mn,non US ti 25 minhinunt votlida US V Catarog anti lit, 0 ipidoa cOntiOl ii, modvi kits v C scale Tatn kits boat modal hits aooassoivs vc SOC encloSOd V Saoats otModaiAiplanaBoilding lnotodingdestgvoonsttuotion ovaaing tinishing ttying tosting OOn,Oi syntents eto 250 noolosad U Saoas 09 Contvl tin Ca,e Fiyiog inolodrng peiigvi sotatag stunttoq Ca,a ulda tagolativnt Ca,iv flying bin, Oontvl Wa inatattatton instuctions 250 avolosad Nooveck Only U S mona0 odns ocu,anCyaooaytvd Name Addless ________________Cy.Statc ......Zp Openers continued page 4 product review product review product review nels time five channels max reed receiversmuch later would have eight channels two elevator two rudder two ailerons two engine trim added some times five control sticks required well after 1950 1940s Good Brothers rudder elevator using two receivers two escapementsthis added rudder-only Guff milestone air plane topped everything few years immediately preceeding war Walker Siegfried confused Sig elevator control before war would such aircraft compete against other today cannot thrown together some kind Tur key Shoot Historically rudder-and-ele vator jobs did compete against rudder although throughout great middle period RC subsequent 1953 until 1968rules written preserve rudder onlywhich competi tively phased out increasingly different interest Classes II III rudder rudder ele vator obvi ously Vintage rudder-only crates flown some rules should separate types number kinds control surfaces Since multiple channel systems existed before war post60s Classes II III setup might good way insure particular old RC jobs could compete against kind would seem appropriate yes teryears ships flown type say loosely equipment em ployed original ac tuator whatever perhaps should always have throttle make things interesting consider some designs crossed overlike rudder-only Beams flown elevator two chan nels No doubt diligent research old magazines will turn up such com binations Perhaps other making type distinctions rules should exact ly almost what old days adjusted post 1960 Classes 111 III arrangement same simple pattern Great fun special events clubs Although outline possible basis competition perhaps necessary evil FO does propose new event will flying machines future can best enjoy what would call thing Surely RC Old Timer already have rejuvenated free flights want handle weve called Vintage Radio Control Non-Modelers title unique book written Paul Kugler released fall Boynton Associates preparation 2 years tackles beginner problemwhich will always us entirely new way Envisioning need hobby shop means absolutely guarantee neophytewho may never have previous contact model construction flyinga system can step step construct successfully fly radio model book presents model called Per former explicit words per haps 500 how-to-do-it pictures guides customer success Thats mighty tall order vast array photos de pict things first pin glue joint covering plane Mono kote fly Like book plane design different has high aspect ratio allwood wingonly four main piecesthat spans 6 ft engine 049its reasoned public has greatest acquain tanceship size powerplant besides easiest cheapest use fuselage sheet balsa few pieces mind can conceive Tail surfaces sheet no land ing gearjust wire skid Two pieces wood form wing panel Jedelski fashion wide piece sheet glued September 1978 83 MORE FIRST PLACE WINNERS AT THE 1977 NATIONALS THAN THE OTHER MAJOR MANUFACTURERS COMBINED IN FACT OVER THE PAST 10 YEARS MORE NAT IONALS WINNERS HAVE USED REV-UP PROPS THAN ANY OTHER BRAND Rev-Up better 1 The efficient design con stant upgrading testing program 2 B4tter quality control better selection hard maple wood 3 The best finish completely fuelproof New Improved 1978 DIAPITCHPRICE 5%34as 63489 733/4119 83 3%456 129 8A77%139 a4565A 77%139 104567149 106W SW149 10SEW159 114677% 7%7%8159 11eEW1e9 ii67189 126179 125W179 1356239 1456279 1556349 164%6449 1756599 1856599 W WIDE BLADE EW EXTRA WIDE SERIES 400 B POE SPEED NG ADVANCED DESIGN ND 1 IN PYLON RACING LEADING SPEED RECORD HOLDER OF ALL TIMES RC pv LON RACING DIAPITCHPRICE 53%4129 756149 7SN SN149 6%6% 6% 7 7%7%159 977% 7%169 CONTROL LINE SPEED& RACING DIA PITCHPRICE 4%6%7129 4%55%129 6 788%149 77%10%11169 689189 89N 9%N189 91213229 N NARROW wide formed leading edge such way cambered airfoil results Formed did say seems Midwest going manufacture kit book kit can recommended together dealer kit course contains shaped leading edge piece Midwest aware FOs sneak preview can say boys have religion Its daring imaginiative approach powered glider hotshots idea trainer must impressed revelations field testing involved very young kids Since two channels required rud der elevator flier involved four very natural stick move ments slow rate climb takes ever get ship real altitude no pressure new flier Control demands presented flier about pace molasses flow ing uphill January 11-year-old boy merely told what stick move ments launched model its first flight come down grass hadnt pushed hard enough launch second flight snagged wing tip grass cartwheeled damage third flight flew ship unaided 9minute flight Mountains words books kits magazines have shoved ginner yet problem big ever knows maybe guys have answer Letters Editor continued page 7 high performance propellers June 78 vol 4 #6 p 30 though pylon racers whatever are out province found deBolts article interesting provocative came away few misgivings think idea presented identical pitch can maintained substituting different types airfoils can very misleading can lead easily specious reasoning Determining pitch some arbitrary datum line seems largely matter choice merely lends itself fiat driving face standard pro peller section would think meaningful approach case would calculate pitch zero lift angle blade airfoil Since could much six seven degrees dif ference zero lift angles between sym metrical airfoil thick flat bottomed section would have big difference aerodynamic pitch also So does leave us would suggest setting propeller blade elements given lift coefficients design advance angles let pitch take care itself As point interest regarding use symmetrical airfoils propeller design recall NACA tests Navy pro peller speedy biconvex airfoil outer fifty percent developing standard airfoil inboard combination gave very high maximum efficiency climb acceleration poor Hal states widest part blade should near 6r station developed view planform seems put much closer hub would interested know came conclusion confuse issue mind NACA propeller compar ison test against standard propeller look ing much like Hals propeller giving highest maximum efficiency its max imum width around 38r nearly straight taper rounded tip gain 3% believe 3% gain propeller efficiency means 1% gain flight speed taken aback fact Hal turning nine inch diameter prop 27K common occurance tip speed well over 1000 per sec seems pushing full-scale metal pro peller ultra thin tip profile Its hard believe miniature pro peller its lower Reynolds Numbers wouldnt suffer severe loss efficiency have thought perhaps wrongly 900 sec about high could go thin carbon/epoxy props would like hear about com pressibility phenomena relates model props. ld pylon racers going three bladed props anticipate part #2 Hals article would like pass warning carving own props Dont depend alone template markings give anticipated blade angle looks good paper small errors creep can really screw things up Recently went through batches old props carved using markings shocked find times off original design intentions Simple angle templates made stiff paper file cards folders etc will make sure have right finally sure balance prop enough balance hori zontally t balanced vertical axis well As friend put tend four bladed prop balance phantom blades Bill Gieskieng Jr Denver CO About Interplane Struts know anyone has called attention plans Comedian July 1976 Henry Farrell #149 have process building Have run trouble plans Everything going along nicely until made interplane struts trouble developed Either cabane struts too short interplane struts too long 84 Model Aviation THE LEADER IN COMPETITION PROPELLERS SPECIAL PRO SERIES 2 FOR ROFREE FLIGHT CONTROL LINE