MIDWEST RIC Models Give choose . thems Midwest model almost kind R/C flyer de sires P minweu PRODUCTS CD hi 400 South Indiana St Hobart IndIana 46342 Uil Letters Editor letters will carefully considered general interest used Send Model Aviation 815 15th St NW Washington DC 20005 Oldest-Youngest RCers Just note think read magazine looking oldest youngest flyers wifes grandfather 85 flew just two weeks ago has several years daughter has flown 2 channel gliders help year March has flown herself several times last few months four Scale EffectThorny Subject John D Prestons article Scale Model January 1978 issue Model Aviation contains error fer statement example P-39 P-s 1 modeled 2inch-to-the-foot scale would have fly 50 mph represent full-scale flight 300mph basis comments comes Bradford W Powers article About the Size same issue own experience dynamic similarity scale factors doing graduate work Quite simply Mr Preston has made common mistake assuming thing scales down same assumed 1/6 scale model would have fly 1/6 speed full scale aircraft represent full scale flight As Mr Powers points out actual model velocity should Full Scale Model _Velocity Velocity Scale Factor 300 mph 6 300 mph 2449 Model Velocity mph According Mr Preston speed average pattern model approx imately 100 mph contrary Mr Prestons assertion heavy P-39 flies much like pattern airplane would disadvantage flight real ism rule change takes place Mr Prestons subsequent implications big light weight slow equate realism also inconsistent facts am scale modeler read Mr Powers article interest scale effect has intrigued engineering standpoint ever since first exposed fact writing ar tide such Mr Powers little things never got done ever Im glad did since much qualified point letter ridicule Mr Preston raise red flag warning AMA going add 10 bonus points realism flight presentation let sure what realism also raise question other scale experts laboring under same misconceptions Mr Preston Mr Jim Talbot Powerss article should read Chico CA scale modeler scale model judge Scale Contest Board member Sheridan L Miszklevitz Benton Harbor MI recent article Bradford Powers About Size has generated other letters column much too long complex reproduced Scale Effect obviously subject handled kid gloves exchange letters dicates Accordingly encouraged John Preston reply through column since Powers quoted referred both Powers Miszklevitzs letters invited Mr Powers make comment Mr Prestons letter appears immediately low after Powers letter appears unforutunate choice words part has led Mr Miszklevitz confuse dynamic similar ity visual similarity para graph concern article begins sentence Such scale model should view look like proto type also fly similar manner said fly visually scale speed think point making would have clearer reader eye realistic speed measured number aircraft lengths covered unit time cannot change perception time actually observing model fly can cheat eye shooting movies models As Mr Powers article stated dynamic scale speed e model Citabria travelling 150 mph will 75 mph Mr Powers goes say take real looking movies model flight will necessary shoot twice frames per second projector speed Thus projected back movies model flight will give illusion travelling visual scale speed 38 mph /2 dynamic scale speed Y4 full scale aircraft speed 6 Model Aviation ATTACKER All-molded styrofoam airplane goes gether fast Rugged its great sport plane easy-to-fly advanced trainer Big 48 span powered 19- 36-size engines 4 chan nels Complete hardware package Designed Jim NewmanKit No 134 SUPER CHIPMUNK ARF injection-molded foam 10 19 en gines Wing span 46 Three channels En gine throttle elevator ailerons Four channels Engine throttle elevator ailerons rudder Kit No 126 STRIKEMASTER Wing span 55 inches Engine sizes 19 40 Foam wing cores balsa coveriiig material sup plied Balsa plywood fuselage die cut Balsa sheet fin stabilizer machine cut fittings hardware formed wire paris sup plied Designed Jim Newman Kit No 130 Unfortunately happen agree Mr Powers generally achieve visual scale speed real life However contestant large and/ light model can certainly put im pressively realistic flight performance compared say model requires speed pattern ship just remain airborne As proof point consider Brandenburg seaplane modeled Joe Tschirgi has very low wing loading earned highest flight score AMA Scale 1977 Nationals Perhaps judges should acknowledge Dy namic Scale Speed awarding points realism myself will con tinue reward contestant has made effort approach Visual Scale Speed John D Preston Falls Church VA think can say both right Preston article talking about visual scale speed looks like real thing observer actually unattainable would 1/6 speed prototype Preston says could attained Edi tor note Preston said Miszklevitz talking about dynamic speed what would actually get proper power article tried make point referring observers vs Mother Nature elaborate further.. build 1/6 model Citabria has 150 hp engine flies 150 mph would look right air could flown 1/6 150 25 mph Actually however would fly 150 times square root 1/6 iSOX 1/245 or6l mph Now. have 1/6 scale model high powered fighter maybe 1500 hp flew 300 mph model would look right speed 1/6 X 300 50 mph Preston says. ally model would fly 1225 mph Mis zlevitz says order get such high speed. ter modContinued page 86 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 off 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 ITEMFUEL LINEPRICEITEMFUEL UNEPRICE 86880Small Neoprene2Pkg.5086885Small Clear Plastic21/sPkg 6881Medium Neoprene2Pkg.6086886Medium Clear Plastic21/sPleg 6882Large Neoprene2Pkg.7086887Large Clear Plastic2Pkg 6883 Small tuft LineI Pkg. 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 Pkg .7086889 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 5 Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticts full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program 1977 EK-Prodcts nc 779 du23 May1978 7 OUT-PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open let CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb Op & Sr 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CL Class B Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st CL Formula 40 Open 1st CL Class B Proto Jr 1st PP Class B Open 1st PP Claus C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OF HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PROOF SPECIAL PRO SERIES 2 FOR AC-FREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 63489 73344119 83/.456129 945964 77%139 10487149 106W 8VV149 10BEW159 1148774 7% 7% 8159 116E5V169 11467169 126179 12SW179 1356219 1456249 1556309 184%6389 W WIDE BLADE 8W EXTRA WIDE SERIES 400 B FOR SPEED NG ADvANCED DESIGN NO1 IN PYLON RACING LEADING SPEED RECORD HOLDER OP ALL TIMES RC PYLON RACING DIA PITCH PRICE 5%3%4129 755%6149 7SN 5%P 6N149 8%6% 6% 7%7%189 96% 747%189 CONTROL LINE 5PEED& RACING DIA PITCHPRICE 4%6%129 4%55%129 6788%149 7714 10%11169 889189 89N 9AN189 8%774189 91213219 N NARROW excelled remember him best showman Thirty years ago one-man act would fly three Fire balls simultaneously maintaining spacing circle means twospeed points engine Since great Walker two hands motor control third model actuated clenching teeth model controlled lines ran top special helmet would start model hand play out lines U-Reely handleall 200 feet would reel hand take bow spectacular stunt pilot Balloon busts done hard way Hed fly over balloon cut back power hover ship motion less above balloon Slowly hed let model sink until pin its tail punctured balloon hed climb out resume circling Stories about him abounded wilder other favorites concerns RC lawnmower act genu ine lawnmower removed reel after following horses parade put through marching drill occasion Jim featured act Sportsmans Pier Chicago three orange Fireballs lined up performers ring Jim made grand entrance marching ring faithful mower following wake Jim hidden control belt buckle unknown him switch accidentally turned off mower swerved toward Fire balls spewed out cloud orange chips brought house down what tore up Jim cries En core Encore write just few paragraphs about Walker diminishes him can said exaggeration anywhere went wherever regardless cir cumstances always brought down house could stand another Jim Walker Letters Editor continued page 7 els ordinarily fly at'the power would 1500/5291 28 hp over two three times power 60 engine used models built hobbyists Bradford Powers San Diego CA Ghoulies Beasties Could help First would like plans R/C Yardbird flying lawnmower.. besides being member R/C club Quincy Flying Falcons am also member U-control club Quincy Glu-Devils spearhead always flying something different very much impressed Zonker being canard design wondering U-control.. have able ob tam info U/C canard designs think Zonker design size would alright knew put bellcrank Also would balance.. Tom Martin 718 Adams Quincy IL 62301 Yard Bird plans cost $1050 dered Ted Teislers Yard Bird 941 Sherwood Dr. La Grange Park IL 60525 Flying lawnmower plans also pub lished RCM Concerning CL version RC canard like Zonker March 77 MA suggest moving CG ward say 10% what shown Zonker plans reduce control sensitivity bellcrank should pivoted inch orso rear CG cause enough yaw maintain line tension plane could constructed CG control pivot location can changed found necessary guide lines should provided extending boom forward wing tip try all-sheet profile Half-A test bed Toms full address given hope someone experience flying CL can ards will help him out FF RecordsA Puzzle am confused about records established unlimited rubber Mulvihill will called now 1977 regulations stipulate Category maximum flight limit 5 minutes 3 official flights allowed ex cept fly-off flights Thus 15 minutes would seem perfect score ever open record 68 minutes 54 seconds Does mean fly-off flights product review product review product review Stinson SR-6 Reliant same scale companys attaCtive Howard DGA-15 wheels floats1/u equals 1 ftthe Stin son SR-6 also developed factory man uals strongly influenced structural design full-size aircraft stringer wing rib former precisely shaped contour exact scale position industry-wide accessories available scale G-Ss scale outline models information write G-S Products Corp Box 488 LaGrande OR 97850 product review product review product review 86 Model Aviation NEWS FLASHI Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8/u-6% new Pylon Rac ing propl -uW w FIRSI AROUND IH[ WORLD DOUGLAS WORLD CRUIS[R 1 72 SCALE PLASTIC MODEL KIT During 1 924 history-making Douglas World Cruisers made first around world flight Covering some 27553 miles epic voyage lasted 1 75 days Now can construct highly-detailed model famous aircraft KIT FEATURES WHEELS AND PONTOONS DECALS TO ALLOW FINISHING MODEL AS ANY ONE OF FIVE DIFFERENT AIRCRAFT TLE AGO ON NEW ORLEANS ON II $495 dealer direct adding 15% postage handling Send 5Q complete illustrated catalog DEPT AWdS 181 PAWNEE ST SAN MARCOS CA 92069 EROS counted record purposes situa tion would seem indicate record dependent upon modeler skills also upon quality competition resulting number fly-off rounds Could please explain situation William G Carson Quantico VA Fly-offs counted FF national records such Mulvikill quality competition isnt necessarily fac tor high figuressuch 68 mm 54 sec reason guy can keep going record purposes until misses max flighteven competi tion dropped out severaiflights back Wi nterhawklEvans continued page 19 right left side raise doub ler bottom edge fuse side allow fuse bottom fit between balsa sides below doubler Let dry Cut out trim sand 3/16 tail sur faces being sure cut lightening holes surfaces per plan Xacto makes punch can used drill ideal purpose Glue fuse parts together first pinning fuse bottom down flat surface glue pin sides corner squares formers rear top nose block Let dry Trim sand leading edges wing panels sheeting will fit neatly Cut wing sheeting size contact-cement sheeting cores using good waterbase contact cement Ep oxy wing panels together using 5-minute epoxy Set dihedral per plans may elect join wing halves using tubing wire should point generally make one-piece wing canopy made large Cirrus canopy turned end end Use Zap Zap filler secure canopy base After sanding fuselage other parts use favorite covering material install radio linkage trim original included small Pon tiac Firebird decal local Pontiac dealer parts epoxy paint DJ Multistripes product review product review product review Scale Drawings Catalogue Known large accurate beautifully drawn scale views Morrison Repla-Tech has added significant number exciting aircraft long list announces $100 total cost special catalogues covering ships aircraft RC Hirsch race-plane drawings later year brand-new RC flying model plans catalogue Morrison Repla-Tech 48500 McKenzie Highway Vida OR 97488 product review product review product review K LET US KNOW WHERE YOU ARE GOINGS move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 COMPLETE THIS FORM AND ATTACH MAILING LABEL FROM RECENT ISSUE Check appropriate boxenclose payment 0 NEW SuBSCRIPTION 0 cHANGE OF ADDRESS Non-AMA subscription rates $1200 12 months Canada United States possession elsewhere $1400 NIAM F RC Scale/Wischers continued page 21 load before stretched Always wind extra turns used forming hooks Some airplanes have springs con nected directly usual applica tions have springs hooked rud der arm joined fork steer ing arm short lengths cable chain latter being common have searched authentic appearing chain stamped link type size small enough models have pro duce own last resort tiny links made thin hard aluminum chain being reproduced has links punched flat metal formed double thickness during assembly next link Houses double-hung windows use type chain sash counterweightsknown sash chain chain used tail wheels similar heavier chain small irregularly shaped holes punched using tool ground filed proper shape Using lead block anvil die holes punched aluminum first external shape link cut around holes scissors tedious re sulting chain appears authentic remarkably strong Although may seem exces sively laborious process create small amount authenticity finished re sult worth effort addition 88 Model Aviation ADDRESS CITY/STATE ____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 FlyIng Near Airports Carefull Free Flight Radio Control Flying near airpofla situation might involve possibility models being vIcinity ot full-scale aircraft operationa muat avoidedor conducted eliminate dangerous situations Models should flown proximity fuli-scale aircraft operations unless flyer has someone else him sole purpose watching full-scale aircraft supervising flying prevent accident possibilities PROTECT YOUR RiGHT TO FLY Sale Flying No Accident
Edition: Model Aviation - 1978/05
Page Numbers: 6, 7, 86, 88
MIDWEST RIC Models Give choose . thems Midwest model almost kind R/C flyer de sires P minweu PRODUCTS CD hi 400 South Indiana St Hobart IndIana 46342 Uil Letters Editor letters will carefully considered general interest used Send Model Aviation 815 15th St NW Washington DC 20005 Oldest-Youngest RCers Just note think read magazine looking oldest youngest flyers wifes grandfather 85 flew just two weeks ago has several years daughter has flown 2 channel gliders help year March has flown herself several times last few months four Scale EffectThorny Subject John D Prestons article Scale Model January 1978 issue Model Aviation contains error fer statement example P-39 P-s 1 modeled 2inch-to-the-foot scale would have fly 50 mph represent full-scale flight 300mph basis comments comes Bradford W Powers article About the Size same issue own experience dynamic similarity scale factors doing graduate work Quite simply Mr Preston has made common mistake assuming thing scales down same assumed 1/6 scale model would have fly 1/6 speed full scale aircraft represent full scale flight As Mr Powers points out actual model velocity should Full Scale Model _Velocity Velocity Scale Factor 300 mph 6 300 mph 2449 Model Velocity mph According Mr Preston speed average pattern model approx imately 100 mph contrary Mr Prestons assertion heavy P-39 flies much like pattern airplane would disadvantage flight real ism rule change takes place Mr Prestons subsequent implications big light weight slow equate realism also inconsistent facts am scale modeler read Mr Powers article interest scale effect has intrigued engineering standpoint ever since first exposed fact writing ar tide such Mr Powers little things never got done ever Im glad did since much qualified point letter ridicule Mr Preston raise red flag warning AMA going add 10 bonus points realism flight presentation let sure what realism also raise question other scale experts laboring under same misconceptions Mr Preston Mr Jim Talbot Powerss article should read Chico CA scale modeler scale model judge Scale Contest Board member Sheridan L Miszklevitz Benton Harbor MI recent article Bradford Powers About Size has generated other letters column much too long complex reproduced Scale Effect obviously subject handled kid gloves exchange letters dicates Accordingly encouraged John Preston reply through column since Powers quoted referred both Powers Miszklevitzs letters invited Mr Powers make comment Mr Prestons letter appears immediately low after Powers letter appears unforutunate choice words part has led Mr Miszklevitz confuse dynamic similar ity visual similarity para graph concern article begins sentence Such scale model should view look like proto type also fly similar manner said fly visually scale speed think point making would have clearer reader eye realistic speed measured number aircraft lengths covered unit time cannot change perception time actually observing model fly can cheat eye shooting movies models As Mr Powers article stated dynamic scale speed e model Citabria travelling 150 mph will 75 mph Mr Powers goes say take real looking movies model flight will necessary shoot twice frames per second projector speed Thus projected back movies model flight will give illusion travelling visual scale speed 38 mph /2 dynamic scale speed Y4 full scale aircraft speed 6 Model Aviation ATTACKER All-molded styrofoam airplane goes gether fast Rugged its great sport plane easy-to-fly advanced trainer Big 48 span powered 19- 36-size engines 4 chan nels Complete hardware package Designed Jim NewmanKit No 134 SUPER CHIPMUNK ARF injection-molded foam 10 19 en gines Wing span 46 Three channels En gine throttle elevator ailerons Four channels Engine throttle elevator ailerons rudder Kit No 126 STRIKEMASTER Wing span 55 inches Engine sizes 19 40 Foam wing cores balsa coveriiig material sup plied Balsa plywood fuselage die cut Balsa sheet fin stabilizer machine cut fittings hardware formed wire paris sup plied Designed Jim Newman Kit No 130 Unfortunately happen agree Mr Powers generally achieve visual scale speed real life However contestant large and/ light model can certainly put im pressively realistic flight performance compared say model requires speed pattern ship just remain airborne As proof point consider Brandenburg seaplane modeled Joe Tschirgi has very low wing loading earned highest flight score AMA Scale 1977 Nationals Perhaps judges should acknowledge Dy namic Scale Speed awarding points realism myself will con tinue reward contestant has made effort approach Visual Scale Speed John D Preston Falls Church VA think can say both right Preston article talking about visual scale speed looks like real thing observer actually unattainable would 1/6 speed prototype Preston says could attained Edi tor note Preston said Miszklevitz talking about dynamic speed what would actually get proper power article tried make point referring observers vs Mother Nature elaborate further.. build 1/6 model Citabria has 150 hp engine flies 150 mph would look right air could flown 1/6 150 25 mph Actually however would fly 150 times square root 1/6 iSOX 1/245 or6l mph Now. have 1/6 scale model high powered fighter maybe 1500 hp flew 300 mph model would look right speed 1/6 X 300 50 mph Preston says. ally model would fly 1225 mph Mis zlevitz says order get such high speed. ter modContinued page 86 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 off 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 ITEMFUEL LINEPRICEITEMFUEL UNEPRICE 86880Small Neoprene2Pkg.5086885Small Clear Plastic21/sPkg 6881Medium Neoprene2Pkg.6086886Medium Clear Plastic21/sPleg 6882Large Neoprene2Pkg.7086887Large Clear Plastic2Pkg 6883 Small tuft LineI Pkg. 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 Pkg .7086889 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 5 Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticts full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program 1977 EK-Prodcts nc 779 du23 May1978 7 OUT-PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open let CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb Op & Sr 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CL Class B Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st CL Formula 40 Open 1st CL Class B Proto Jr 1st PP Class B Open 1st PP Claus C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OF HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PROOF SPECIAL PRO SERIES 2 FOR AC-FREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 63489 73344119 83/.456129 945964 77%139 10487149 106W 8VV149 10BEW159 1148774 7% 7% 8159 116E5V169 11467169 126179 12SW179 1356219 1456249 1556309 184%6389 W WIDE BLADE 8W EXTRA WIDE SERIES 400 B FOR SPEED NG ADvANCED DESIGN NO1 IN PYLON RACING LEADING SPEED RECORD HOLDER OP ALL TIMES RC PYLON RACING DIA PITCH PRICE 5%3%4129 755%6149 7SN 5%P 6N149 8%6% 6% 7%7%189 96% 747%189 CONTROL LINE 5PEED& RACING DIA PITCHPRICE 4%6%129 4%55%129 6788%149 7714 10%11169 889189 89N 9AN189 8%774189 91213219 N NARROW excelled remember him best showman Thirty years ago one-man act would fly three Fire balls simultaneously maintaining spacing circle means twospeed points engine Since great Walker two hands motor control third model actuated clenching teeth model controlled lines ran top special helmet would start model hand play out lines U-Reely handleall 200 feet would reel hand take bow spectacular stunt pilot Balloon busts done hard way Hed fly over balloon cut back power hover ship motion less above balloon Slowly hed let model sink until pin its tail punctured balloon hed climb out resume circling Stories about him abounded wilder other favorites concerns RC lawnmower act genu ine lawnmower removed reel after following horses parade put through marching drill occasion Jim featured act Sportsmans Pier Chicago three orange Fireballs lined up performers ring Jim made grand entrance marching ring faithful mower following wake Jim hidden control belt buckle unknown him switch accidentally turned off mower swerved toward Fire balls spewed out cloud orange chips brought house down what tore up Jim cries En core Encore write just few paragraphs about Walker diminishes him can said exaggeration anywhere went wherever regardless cir cumstances always brought down house could stand another Jim Walker Letters Editor continued page 7 els ordinarily fly at'the power would 1500/5291 28 hp over two three times power 60 engine used models built hobbyists Bradford Powers San Diego CA Ghoulies Beasties Could help First would like plans R/C Yardbird flying lawnmower.. besides being member R/C club Quincy Flying Falcons am also member U-control club Quincy Glu-Devils spearhead always flying something different very much impressed Zonker being canard design wondering U-control.. have able ob tam info U/C canard designs think Zonker design size would alright knew put bellcrank Also would balance.. Tom Martin 718 Adams Quincy IL 62301 Yard Bird plans cost $1050 dered Ted Teislers Yard Bird 941 Sherwood Dr. La Grange Park IL 60525 Flying lawnmower plans also pub lished RCM Concerning CL version RC canard like Zonker March 77 MA suggest moving CG ward say 10% what shown Zonker plans reduce control sensitivity bellcrank should pivoted inch orso rear CG cause enough yaw maintain line tension plane could constructed CG control pivot location can changed found necessary guide lines should provided extending boom forward wing tip try all-sheet profile Half-A test bed Toms full address given hope someone experience flying CL can ards will help him out FF RecordsA Puzzle am confused about records established unlimited rubber Mulvihill will called now 1977 regulations stipulate Category maximum flight limit 5 minutes 3 official flights allowed ex cept fly-off flights Thus 15 minutes would seem perfect score ever open record 68 minutes 54 seconds Does mean fly-off flights product review product review product review Stinson SR-6 Reliant same scale companys attaCtive Howard DGA-15 wheels floats1/u equals 1 ftthe Stin son SR-6 also developed factory man uals strongly influenced structural design full-size aircraft stringer wing rib former precisely shaped contour exact scale position industry-wide accessories available scale G-Ss scale outline models information write G-S Products Corp Box 488 LaGrande OR 97850 product review product review product review 86 Model Aviation NEWS FLASHI Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8/u-6% new Pylon Rac ing propl -uW w FIRSI AROUND IH[ WORLD DOUGLAS WORLD CRUIS[R 1 72 SCALE PLASTIC MODEL KIT During 1 924 history-making Douglas World Cruisers made first around world flight Covering some 27553 miles epic voyage lasted 1 75 days Now can construct highly-detailed model famous aircraft KIT FEATURES WHEELS AND PONTOONS DECALS TO ALLOW FINISHING MODEL AS ANY ONE OF FIVE DIFFERENT AIRCRAFT TLE AGO ON NEW ORLEANS ON II $495 dealer direct adding 15% postage handling Send 5Q complete illustrated catalog DEPT AWdS 181 PAWNEE ST SAN MARCOS CA 92069 EROS counted record purposes situa tion would seem indicate record dependent upon modeler skills also upon quality competition resulting number fly-off rounds Could please explain situation William G Carson Quantico VA Fly-offs counted FF national records such Mulvikill quality competition isnt necessarily fac tor high figuressuch 68 mm 54 sec reason guy can keep going record purposes until misses max flighteven competi tion dropped out severaiflights back Wi nterhawklEvans continued page 19 right left side raise doub ler bottom edge fuse side allow fuse bottom fit between balsa sides below doubler Let dry Cut out trim sand 3/16 tail sur faces being sure cut lightening holes surfaces per plan Xacto makes punch can used drill ideal purpose Glue fuse parts together first pinning fuse bottom down flat surface glue pin sides corner squares formers rear top nose block Let dry Trim sand leading edges wing panels sheeting will fit neatly Cut wing sheeting size contact-cement sheeting cores using good waterbase contact cement Ep oxy wing panels together using 5-minute epoxy Set dihedral per plans may elect join wing halves using tubing wire should point generally make one-piece wing canopy made large Cirrus canopy turned end end Use Zap Zap filler secure canopy base After sanding fuselage other parts use favorite covering material install radio linkage trim original included small Pon tiac Firebird decal local Pontiac dealer parts epoxy paint DJ Multistripes product review product review product review Scale Drawings Catalogue Known large accurate beautifully drawn scale views Morrison Repla-Tech has added significant number exciting aircraft long list announces $100 total cost special catalogues covering ships aircraft RC Hirsch race-plane drawings later year brand-new RC flying model plans catalogue Morrison Repla-Tech 48500 McKenzie Highway Vida OR 97488 product review product review product review K LET US KNOW WHERE YOU ARE GOINGS move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 COMPLETE THIS FORM AND ATTACH MAILING LABEL FROM RECENT ISSUE Check appropriate boxenclose payment 0 NEW SuBSCRIPTION 0 cHANGE OF ADDRESS Non-AMA subscription rates $1200 12 months Canada United States possession elsewhere $1400 NIAM F RC Scale/Wischers continued page 21 load before stretched Always wind extra turns used forming hooks Some airplanes have springs con nected directly usual applica tions have springs hooked rud der arm joined fork steer ing arm short lengths cable chain latter being common have searched authentic appearing chain stamped link type size small enough models have pro duce own last resort tiny links made thin hard aluminum chain being reproduced has links punched flat metal formed double thickness during assembly next link Houses double-hung windows use type chain sash counterweightsknown sash chain chain used tail wheels similar heavier chain small irregularly shaped holes punched using tool ground filed proper shape Using lead block anvil die holes punched aluminum first external shape link cut around holes scissors tedious re sulting chain appears authentic remarkably strong Although may seem exces sively laborious process create small amount authenticity finished re sult worth effort addition 88 Model Aviation ADDRESS CITY/STATE ____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 FlyIng Near Airports Carefull Free Flight Radio Control Flying near airpofla situation might involve possibility models being vIcinity ot full-scale aircraft operationa muat avoidedor conducted eliminate dangerous situations Models should flown proximity fuli-scale aircraft operations unless flyer has someone else him sole purpose watching full-scale aircraft supervising flying prevent accident possibilities PROTECT YOUR RiGHT TO FLY Sale Flying No Accident
Edition: Model Aviation - 1978/05
Page Numbers: 6, 7, 86, 88
MIDWEST RIC Models Give choose . thems Midwest model almost kind R/C flyer de sires P minweu PRODUCTS CD hi 400 South Indiana St Hobart IndIana 46342 Uil Letters Editor letters will carefully considered general interest used Send Model Aviation 815 15th St NW Washington DC 20005 Oldest-Youngest RCers Just note think read magazine looking oldest youngest flyers wifes grandfather 85 flew just two weeks ago has several years daughter has flown 2 channel gliders help year March has flown herself several times last few months four Scale EffectThorny Subject John D Prestons article Scale Model January 1978 issue Model Aviation contains error fer statement example P-39 P-s 1 modeled 2inch-to-the-foot scale would have fly 50 mph represent full-scale flight 300mph basis comments comes Bradford W Powers article About the Size same issue own experience dynamic similarity scale factors doing graduate work Quite simply Mr Preston has made common mistake assuming thing scales down same assumed 1/6 scale model would have fly 1/6 speed full scale aircraft represent full scale flight As Mr Powers points out actual model velocity should Full Scale Model _Velocity Velocity Scale Factor 300 mph 6 300 mph 2449 Model Velocity mph According Mr Preston speed average pattern model approx imately 100 mph contrary Mr Prestons assertion heavy P-39 flies much like pattern airplane would disadvantage flight real ism rule change takes place Mr Prestons subsequent implications big light weight slow equate realism also inconsistent facts am scale modeler read Mr Powers article interest scale effect has intrigued engineering standpoint ever since first exposed fact writing ar tide such Mr Powers little things never got done ever Im glad did since much qualified point letter ridicule Mr Preston raise red flag warning AMA going add 10 bonus points realism flight presentation let sure what realism also raise question other scale experts laboring under same misconceptions Mr Preston Mr Jim Talbot Powerss article should read Chico CA scale modeler scale model judge Scale Contest Board member Sheridan L Miszklevitz Benton Harbor MI recent article Bradford Powers About Size has generated other letters column much too long complex reproduced Scale Effect obviously subject handled kid gloves exchange letters dicates Accordingly encouraged John Preston reply through column since Powers quoted referred both Powers Miszklevitzs letters invited Mr Powers make comment Mr Prestons letter appears immediately low after Powers letter appears unforutunate choice words part has led Mr Miszklevitz confuse dynamic similar ity visual similarity para graph concern article begins sentence Such scale model should view look like proto type also fly similar manner said fly visually scale speed think point making would have clearer reader eye realistic speed measured number aircraft lengths covered unit time cannot change perception time actually observing model fly can cheat eye shooting movies models As Mr Powers article stated dynamic scale speed e model Citabria travelling 150 mph will 75 mph Mr Powers goes say take real looking movies model flight will necessary shoot twice frames per second projector speed Thus projected back movies model flight will give illusion travelling visual scale speed 38 mph /2 dynamic scale speed Y4 full scale aircraft speed 6 Model Aviation ATTACKER All-molded styrofoam airplane goes gether fast Rugged its great sport plane easy-to-fly advanced trainer Big 48 span powered 19- 36-size engines 4 chan nels Complete hardware package Designed Jim NewmanKit No 134 SUPER CHIPMUNK ARF injection-molded foam 10 19 en gines Wing span 46 Three channels En gine throttle elevator ailerons Four channels Engine throttle elevator ailerons rudder Kit No 126 STRIKEMASTER Wing span 55 inches Engine sizes 19 40 Foam wing cores balsa coveriiig material sup plied Balsa plywood fuselage die cut Balsa sheet fin stabilizer machine cut fittings hardware formed wire paris sup plied Designed Jim Newman Kit No 130 Unfortunately happen agree Mr Powers generally achieve visual scale speed real life However contestant large and/ light model can certainly put im pressively realistic flight performance compared say model requires speed pattern ship just remain airborne As proof point consider Brandenburg seaplane modeled Joe Tschirgi has very low wing loading earned highest flight score AMA Scale 1977 Nationals Perhaps judges should acknowledge Dy namic Scale Speed awarding points realism myself will con tinue reward contestant has made effort approach Visual Scale Speed John D Preston Falls Church VA think can say both right Preston article talking about visual scale speed looks like real thing observer actually unattainable would 1/6 speed prototype Preston says could attained Edi tor note Preston said Miszklevitz talking about dynamic speed what would actually get proper power article tried make point referring observers vs Mother Nature elaborate further.. build 1/6 model Citabria has 150 hp engine flies 150 mph would look right air could flown 1/6 150 25 mph Actually however would fly 150 times square root 1/6 iSOX 1/245 or6l mph Now. have 1/6 scale model high powered fighter maybe 1500 hp flew 300 mph model would look right speed 1/6 X 300 50 mph Preston says. ally model would fly 1225 mph Mis zlevitz says order get such high speed. ter modContinued page 86 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 off 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 ITEMFUEL LINEPRICEITEMFUEL UNEPRICE 86880Small Neoprene2Pkg.5086885Small Clear Plastic21/sPkg 6881Medium Neoprene2Pkg.6086886Medium Clear Plastic21/sPleg 6882Large Neoprene2Pkg.7086887Large Clear Plastic2Pkg 6883 Small tuft LineI Pkg. 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 Pkg .7086889 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 5 Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticts full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program 1977 EK-Prodcts nc 779 du23 May1978 7 OUT-PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open let CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb Op & Sr 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CL Class B Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st CL Formula 40 Open 1st CL Class B Proto Jr 1st PP Class B Open 1st PP Claus C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OF HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PROOF SPECIAL PRO SERIES 2 FOR AC-FREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 63489 73344119 83/.456129 945964 77%139 10487149 106W 8VV149 10BEW159 1148774 7% 7% 8159 116E5V169 11467169 126179 12SW179 1356219 1456249 1556309 184%6389 W WIDE BLADE 8W EXTRA WIDE SERIES 400 B FOR SPEED NG ADvANCED DESIGN NO1 IN PYLON RACING LEADING SPEED RECORD HOLDER OP ALL TIMES RC PYLON RACING DIA PITCH PRICE 5%3%4129 755%6149 7SN 5%P 6N149 8%6% 6% 7%7%189 96% 747%189 CONTROL LINE 5PEED& RACING DIA PITCHPRICE 4%6%129 4%55%129 6788%149 7714 10%11169 889189 89N 9AN189 8%774189 91213219 N NARROW excelled remember him best showman Thirty years ago one-man act would fly three Fire balls simultaneously maintaining spacing circle means twospeed points engine Since great Walker two hands motor control third model actuated clenching teeth model controlled lines ran top special helmet would start model hand play out lines U-Reely handleall 200 feet would reel hand take bow spectacular stunt pilot Balloon busts done hard way Hed fly over balloon cut back power hover ship motion less above balloon Slowly hed let model sink until pin its tail punctured balloon hed climb out resume circling Stories about him abounded wilder other favorites concerns RC lawnmower act genu ine lawnmower removed reel after following horses parade put through marching drill occasion Jim featured act Sportsmans Pier Chicago three orange Fireballs lined up performers ring Jim made grand entrance marching ring faithful mower following wake Jim hidden control belt buckle unknown him switch accidentally turned off mower swerved toward Fire balls spewed out cloud orange chips brought house down what tore up Jim cries En core Encore write just few paragraphs about Walker diminishes him can said exaggeration anywhere went wherever regardless cir cumstances always brought down house could stand another Jim Walker Letters Editor continued page 7 els ordinarily fly at'the power would 1500/5291 28 hp over two three times power 60 engine used models built hobbyists Bradford Powers San Diego CA Ghoulies Beasties Could help First would like plans R/C Yardbird flying lawnmower.. besides being member R/C club Quincy Flying Falcons am also member U-control club Quincy Glu-Devils spearhead always flying something different very much impressed Zonker being canard design wondering U-control.. have able ob tam info U/C canard designs think Zonker design size would alright knew put bellcrank Also would balance.. Tom Martin 718 Adams Quincy IL 62301 Yard Bird plans cost $1050 dered Ted Teislers Yard Bird 941 Sherwood Dr. La Grange Park IL 60525 Flying lawnmower plans also pub lished RCM Concerning CL version RC canard like Zonker March 77 MA suggest moving CG ward say 10% what shown Zonker plans reduce control sensitivity bellcrank should pivoted inch orso rear CG cause enough yaw maintain line tension plane could constructed CG control pivot location can changed found necessary guide lines should provided extending boom forward wing tip try all-sheet profile Half-A test bed Toms full address given hope someone experience flying CL can ards will help him out FF RecordsA Puzzle am confused about records established unlimited rubber Mulvihill will called now 1977 regulations stipulate Category maximum flight limit 5 minutes 3 official flights allowed ex cept fly-off flights Thus 15 minutes would seem perfect score ever open record 68 minutes 54 seconds Does mean fly-off flights product review product review product review Stinson SR-6 Reliant same scale companys attaCtive Howard DGA-15 wheels floats1/u equals 1 ftthe Stin son SR-6 also developed factory man uals strongly influenced structural design full-size aircraft stringer wing rib former precisely shaped contour exact scale position industry-wide accessories available scale G-Ss scale outline models information write G-S Products Corp Box 488 LaGrande OR 97850 product review product review product review 86 Model Aviation NEWS FLASHI Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8/u-6% new Pylon Rac ing propl -uW w FIRSI AROUND IH[ WORLD DOUGLAS WORLD CRUIS[R 1 72 SCALE PLASTIC MODEL KIT During 1 924 history-making Douglas World Cruisers made first around world flight Covering some 27553 miles epic voyage lasted 1 75 days Now can construct highly-detailed model famous aircraft KIT FEATURES WHEELS AND PONTOONS DECALS TO ALLOW FINISHING MODEL AS ANY ONE OF FIVE DIFFERENT AIRCRAFT TLE AGO ON NEW ORLEANS ON II $495 dealer direct adding 15% postage handling Send 5Q complete illustrated catalog DEPT AWdS 181 PAWNEE ST SAN MARCOS CA 92069 EROS counted record purposes situa tion would seem indicate record dependent upon modeler skills also upon quality competition resulting number fly-off rounds Could please explain situation William G Carson Quantico VA Fly-offs counted FF national records such Mulvikill quality competition isnt necessarily fac tor high figuressuch 68 mm 54 sec reason guy can keep going record purposes until misses max flighteven competi tion dropped out severaiflights back Wi nterhawklEvans continued page 19 right left side raise doub ler bottom edge fuse side allow fuse bottom fit between balsa sides below doubler Let dry Cut out trim sand 3/16 tail sur faces being sure cut lightening holes surfaces per plan Xacto makes punch can used drill ideal purpose Glue fuse parts together first pinning fuse bottom down flat surface glue pin sides corner squares formers rear top nose block Let dry Trim sand leading edges wing panels sheeting will fit neatly Cut wing sheeting size contact-cement sheeting cores using good waterbase contact cement Ep oxy wing panels together using 5-minute epoxy Set dihedral per plans may elect join wing halves using tubing wire should point generally make one-piece wing canopy made large Cirrus canopy turned end end Use Zap Zap filler secure canopy base After sanding fuselage other parts use favorite covering material install radio linkage trim original included small Pon tiac Firebird decal local Pontiac dealer parts epoxy paint DJ Multistripes product review product review product review Scale Drawings Catalogue Known large accurate beautifully drawn scale views Morrison Repla-Tech has added significant number exciting aircraft long list announces $100 total cost special catalogues covering ships aircraft RC Hirsch race-plane drawings later year brand-new RC flying model plans catalogue Morrison Repla-Tech 48500 McKenzie Highway Vida OR 97488 product review product review product review K LET US KNOW WHERE YOU ARE GOINGS move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 COMPLETE THIS FORM AND ATTACH MAILING LABEL FROM RECENT ISSUE Check appropriate boxenclose payment 0 NEW SuBSCRIPTION 0 cHANGE OF ADDRESS Non-AMA subscription rates $1200 12 months Canada United States possession elsewhere $1400 NIAM F RC Scale/Wischers continued page 21 load before stretched Always wind extra turns used forming hooks Some airplanes have springs con nected directly usual applica tions have springs hooked rud der arm joined fork steer ing arm short lengths cable chain latter being common have searched authentic appearing chain stamped link type size small enough models have pro duce own last resort tiny links made thin hard aluminum chain being reproduced has links punched flat metal formed double thickness during assembly next link Houses double-hung windows use type chain sash counterweightsknown sash chain chain used tail wheels similar heavier chain small irregularly shaped holes punched using tool ground filed proper shape Using lead block anvil die holes punched aluminum first external shape link cut around holes scissors tedious re sulting chain appears authentic remarkably strong Although may seem exces sively laborious process create small amount authenticity finished re sult worth effort addition 88 Model Aviation ADDRESS CITY/STATE ____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 FlyIng Near Airports Carefull Free Flight Radio Control Flying near airpofla situation might involve possibility models being vIcinity ot full-scale aircraft operationa muat avoidedor conducted eliminate dangerous situations Models should flown proximity fuli-scale aircraft operations unless flyer has someone else him sole purpose watching full-scale aircraft supervising flying prevent accident possibilities PROTECT YOUR RiGHT TO FLY Sale Flying No Accident
Edition: Model Aviation - 1978/05
Page Numbers: 6, 7, 86, 88
MIDWEST RIC Models Give choose . thems Midwest model almost kind R/C flyer de sires P minweu PRODUCTS CD hi 400 South Indiana St Hobart IndIana 46342 Uil Letters Editor letters will carefully considered general interest used Send Model Aviation 815 15th St NW Washington DC 20005 Oldest-Youngest RCers Just note think read magazine looking oldest youngest flyers wifes grandfather 85 flew just two weeks ago has several years daughter has flown 2 channel gliders help year March has flown herself several times last few months four Scale EffectThorny Subject John D Prestons article Scale Model January 1978 issue Model Aviation contains error fer statement example P-39 P-s 1 modeled 2inch-to-the-foot scale would have fly 50 mph represent full-scale flight 300mph basis comments comes Bradford W Powers article About the Size same issue own experience dynamic similarity scale factors doing graduate work Quite simply Mr Preston has made common mistake assuming thing scales down same assumed 1/6 scale model would have fly 1/6 speed full scale aircraft represent full scale flight As Mr Powers points out actual model velocity should Full Scale Model _Velocity Velocity Scale Factor 300 mph 6 300 mph 2449 Model Velocity mph According Mr Preston speed average pattern model approx imately 100 mph contrary Mr Prestons assertion heavy P-39 flies much like pattern airplane would disadvantage flight real ism rule change takes place Mr Prestons subsequent implications big light weight slow equate realism also inconsistent facts am scale modeler read Mr Powers article interest scale effect has intrigued engineering standpoint ever since first exposed fact writing ar tide such Mr Powers little things never got done ever Im glad did since much qualified point letter ridicule Mr Preston raise red flag warning AMA going add 10 bonus points realism flight presentation let sure what realism also raise question other scale experts laboring under same misconceptions Mr Preston Mr Jim Talbot Powerss article should read Chico CA scale modeler scale model judge Scale Contest Board member Sheridan L Miszklevitz Benton Harbor MI recent article Bradford Powers About Size has generated other letters column much too long complex reproduced Scale Effect obviously subject handled kid gloves exchange letters dicates Accordingly encouraged John Preston reply through column since Powers quoted referred both Powers Miszklevitzs letters invited Mr Powers make comment Mr Prestons letter appears immediately low after Powers letter appears unforutunate choice words part has led Mr Miszklevitz confuse dynamic similar ity visual similarity para graph concern article begins sentence Such scale model should view look like proto type also fly similar manner said fly visually scale speed think point making would have clearer reader eye realistic speed measured number aircraft lengths covered unit time cannot change perception time actually observing model fly can cheat eye shooting movies models As Mr Powers article stated dynamic scale speed e model Citabria travelling 150 mph will 75 mph Mr Powers goes say take real looking movies model flight will necessary shoot twice frames per second projector speed Thus projected back movies model flight will give illusion travelling visual scale speed 38 mph /2 dynamic scale speed Y4 full scale aircraft speed 6 Model Aviation ATTACKER All-molded styrofoam airplane goes gether fast Rugged its great sport plane easy-to-fly advanced trainer Big 48 span powered 19- 36-size engines 4 chan nels Complete hardware package Designed Jim NewmanKit No 134 SUPER CHIPMUNK ARF injection-molded foam 10 19 en gines Wing span 46 Three channels En gine throttle elevator ailerons Four channels Engine throttle elevator ailerons rudder Kit No 126 STRIKEMASTER Wing span 55 inches Engine sizes 19 40 Foam wing cores balsa coveriiig material sup plied Balsa plywood fuselage die cut Balsa sheet fin stabilizer machine cut fittings hardware formed wire paris sup plied Designed Jim Newman Kit No 130 Unfortunately happen agree Mr Powers generally achieve visual scale speed real life However contestant large and/ light model can certainly put im pressively realistic flight performance compared say model requires speed pattern ship just remain airborne As proof point consider Brandenburg seaplane modeled Joe Tschirgi has very low wing loading earned highest flight score AMA Scale 1977 Nationals Perhaps judges should acknowledge Dy namic Scale Speed awarding points realism myself will con tinue reward contestant has made effort approach Visual Scale Speed John D Preston Falls Church VA think can say both right Preston article talking about visual scale speed looks like real thing observer actually unattainable would 1/6 speed prototype Preston says could attained Edi tor note Preston said Miszklevitz talking about dynamic speed what would actually get proper power article tried make point referring observers vs Mother Nature elaborate further.. build 1/6 model Citabria has 150 hp engine flies 150 mph would look right air could flown 1/6 150 25 mph Actually however would fly 150 times square root 1/6 iSOX 1/245 or6l mph Now. have 1/6 scale model high powered fighter maybe 1500 hp flew 300 mph model would look right speed 1/6 X 300 50 mph Preston says. ally model would fly 1225 mph Mis zlevitz says order get such high speed. ter modContinued page 86 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 off 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 ITEMFUEL LINEPRICEITEMFUEL UNEPRICE 86880Small Neoprene2Pkg.5086885Small Clear Plastic21/sPkg 6881Medium Neoprene2Pkg.6086886Medium Clear Plastic21/sPleg 6882Large Neoprene2Pkg.7086887Large Clear Plastic2Pkg 6883 Small tuft LineI Pkg. 5586888 Small Surgical Tubing2 Pkg.50 86884 Medium Tuft Line1 Pkg .7086889 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 5 Receiver servos equipped 3 pin Deans gold plated plugs 6 Adjustable tension control sticts full line brochure write EK-PRODUCTS INC 3322 Stovall St Irving Texas 75061 USA Distributors dealers contact us new merchandising program 1977 EK-Prodcts nc 779 du23 May1978 7 OUT-PERFORMS ALL OTHERS AT THE 1976 NATIONALS 1st RC Masters Class 1st RC Advanced 1st RC Novice 1st RC Sport Scale 1st Formula Pylon 1st Quarter Midget Pylon 1st CL Stunt Open let CL Stunt Senior 1st CL Stunt Junior 1st CL Combat O & Sr 1st CL Slow Comb Op & Sr 1st CL Carrier II Op Jr Sr 1st CL Carrier Jr & Sr 1st CL Class 0 Speed Open 1st CL Class C Speed Jr & Sr 1st CL Class B Speed Op & Sr 1st CL Cl Speed Op Sr Jr 1st CL Formula 40 Open 1st CL Class B Proto Jr 1st PP Class B Open 1st PP Claus C Open HIGH PERFORMANCE * COMPETITION PROVEN * THIN RIGID BLADES OF HARD MAPLE WOOD * SUPERBLY FINISHED COMPLETELY FUEL PROOF SPECIAL PRO SERIES 2 FOR AC-FREE FLIGHT CONTROL LINE DIAPITCHPRICE 5%3489 63489 73344119 83/.456129 945964 77%139 10487149 106W 8VV149 10BEW159 1148774 7% 7% 8159 116E5V169 11467169 126179 12SW179 1356219 1456249 1556309 184%6389 W WIDE BLADE 8W EXTRA WIDE SERIES 400 B FOR SPEED NG ADvANCED DESIGN NO1 IN PYLON RACING LEADING SPEED RECORD HOLDER OP ALL TIMES RC PYLON RACING DIA PITCH PRICE 5%3%4129 755%6149 7SN 5%P 6N149 8%6% 6% 7%7%189 96% 747%189 CONTROL LINE 5PEED& RACING DIA PITCHPRICE 4%6%129 4%55%129 6788%149 7714 10%11169 889189 89N 9AN189 8%774189 91213219 N NARROW excelled remember him best showman Thirty years ago one-man act would fly three Fire balls simultaneously maintaining spacing circle means twospeed points engine Since great Walker two hands motor control third model actuated clenching teeth model controlled lines ran top special helmet would start model hand play out lines U-Reely handleall 200 feet would reel hand take bow spectacular stunt pilot Balloon busts done hard way Hed fly over balloon cut back power hover ship motion less above balloon Slowly hed let model sink until pin its tail punctured balloon hed climb out resume circling Stories about him abounded wilder other favorites concerns RC lawnmower act genu ine lawnmower removed reel after following horses parade put through marching drill occasion Jim featured act Sportsmans Pier Chicago three orange Fireballs lined up performers ring Jim made grand entrance marching ring faithful mower following wake Jim hidden control belt buckle unknown him switch accidentally turned off mower swerved toward Fire balls spewed out cloud orange chips brought house down what tore up Jim cries En core Encore write just few paragraphs about Walker diminishes him can said exaggeration anywhere went wherever regardless cir cumstances always brought down house could stand another Jim Walker Letters Editor continued page 7 els ordinarily fly at'the power would 1500/5291 28 hp over two three times power 60 engine used models built hobbyists Bradford Powers San Diego CA Ghoulies Beasties Could help First would like plans R/C Yardbird flying lawnmower.. besides being member R/C club Quincy Flying Falcons am also member U-control club Quincy Glu-Devils spearhead always flying something different very much impressed Zonker being canard design wondering U-control.. have able ob tam info U/C canard designs think Zonker design size would alright knew put bellcrank Also would balance.. Tom Martin 718 Adams Quincy IL 62301 Yard Bird plans cost $1050 dered Ted Teislers Yard Bird 941 Sherwood Dr. La Grange Park IL 60525 Flying lawnmower plans also pub lished RCM Concerning CL version RC canard like Zonker March 77 MA suggest moving CG ward say 10% what shown Zonker plans reduce control sensitivity bellcrank should pivoted inch orso rear CG cause enough yaw maintain line tension plane could constructed CG control pivot location can changed found necessary guide lines should provided extending boom forward wing tip try all-sheet profile Half-A test bed Toms full address given hope someone experience flying CL can ards will help him out FF RecordsA Puzzle am confused about records established unlimited rubber Mulvihill will called now 1977 regulations stipulate Category maximum flight limit 5 minutes 3 official flights allowed ex cept fly-off flights Thus 15 minutes would seem perfect score ever open record 68 minutes 54 seconds Does mean fly-off flights product review product review product review Stinson SR-6 Reliant same scale companys attaCtive Howard DGA-15 wheels floats1/u equals 1 ftthe Stin son SR-6 also developed factory man uals strongly influenced structural design full-size aircraft stringer wing rib former precisely shaped contour exact scale position industry-wide accessories available scale G-Ss scale outline models information write G-S Products Corp Box 488 LaGrande OR 97850 product review product review product review 86 Model Aviation NEWS FLASHI Bob Smith Chatsworth CA set new World Speed Record June 19 Pylon mula 11125 RevUp 8/u-6% new Pylon Rac ing propl -uW w FIRSI AROUND IH[ WORLD DOUGLAS WORLD CRUIS[R 1 72 SCALE PLASTIC MODEL KIT During 1 924 history-making Douglas World Cruisers made first around world flight Covering some 27553 miles epic voyage lasted 1 75 days Now can construct highly-detailed model famous aircraft KIT FEATURES WHEELS AND PONTOONS DECALS TO ALLOW FINISHING MODEL AS ANY ONE OF FIVE DIFFERENT AIRCRAFT TLE AGO ON NEW ORLEANS ON II $495 dealer direct adding 15% postage handling Send 5Q complete illustrated catalog DEPT AWdS 181 PAWNEE ST SAN MARCOS CA 92069 EROS counted record purposes situa tion would seem indicate record dependent upon modeler skills also upon quality competition resulting number fly-off rounds Could please explain situation William G Carson Quantico VA Fly-offs counted FF national records such Mulvikill quality competition isnt necessarily fac tor high figuressuch 68 mm 54 sec reason guy can keep going record purposes until misses max flighteven competi tion dropped out severaiflights back Wi nterhawklEvans continued page 19 right left side raise doub ler bottom edge fuse side allow fuse bottom fit between balsa sides below doubler Let dry Cut out trim sand 3/16 tail sur faces being sure cut lightening holes surfaces per plan Xacto makes punch can used drill ideal purpose Glue fuse parts together first pinning fuse bottom down flat surface glue pin sides corner squares formers rear top nose block Let dry Trim sand leading edges wing panels sheeting will fit neatly Cut wing sheeting size contact-cement sheeting cores using good waterbase contact cement Ep oxy wing panels together using 5-minute epoxy Set dihedral per plans may elect join wing halves using tubing wire should point generally make one-piece wing canopy made large Cirrus canopy turned end end Use Zap Zap filler secure canopy base After sanding fuselage other parts use favorite covering material install radio linkage trim original included small Pon tiac Firebird decal local Pontiac dealer parts epoxy paint DJ Multistripes product review product review product review Scale Drawings Catalogue Known large accurate beautifully drawn scale views Morrison Repla-Tech has added significant number exciting aircraft long list announces $100 total cost special catalogues covering ships aircraft RC Hirsch race-plane drawings later year brand-new RC flying model plans catalogue Morrison Repla-Tech 48500 McKenzie Highway Vida OR 97488 product review product review product review K LET US KNOW WHERE YOU ARE GOINGS move please let us know advancesix weeks re quired change address Attach current MA mailing label check appropriate box mail Subscription Dept Model Aviation 815 Fifteenth St. NW. Washington DC. 20005 COMPLETE THIS FORM AND ATTACH MAILING LABEL FROM RECENT ISSUE Check appropriate boxenclose payment 0 NEW SuBSCRIPTION 0 cHANGE OF ADDRESS Non-AMA subscription rates $1200 12 months Canada United States possession elsewhere $1400 NIAM F RC Scale/Wischers continued page 21 load before stretched Always wind extra turns used forming hooks Some airplanes have springs con nected directly usual applica tions have springs hooked rud der arm joined fork steer ing arm short lengths cable chain latter being common have searched authentic appearing chain stamped link type size small enough models have pro duce own last resort tiny links made thin hard aluminum chain being reproduced has links punched flat metal formed double thickness during assembly next link Houses double-hung windows use type chain sash counterweightsknown sash chain chain used tail wheels similar heavier chain small irregularly shaped holes punched using tool ground filed proper shape Using lead block anvil die holes punched aluminum first external shape link cut around holes scissors tedious re sulting chain appears authentic remarkably strong Although may seem exces sively laborious process create small amount authenticity finished re sult worth effort addition 88 Model Aviation ADDRESS CITY/STATE ____________________________________________ ZIP _______________ MODEL AVIATION 815 FIFTEENTH ST. NW. WASHINGTON DC 20005 FlyIng Near Airports Carefull Free Flight Radio Control Flying near airpofla situation might involve possibility models being vIcinity ot full-scale aircraft operationa muat avoidedor conducted eliminate dangerous situations Models should flown proximity fuli-scale aircraft operations unless flyer has someone else him sole purpose watching full-scale aircraft supervising flying prevent accident possibilities PROTECT YOUR RiGHT TO FLY Sale Flying No Accident