BOB WHITE Does Again Bob won Wakefield event held first day two-day California Eagles Annual Taft March Bobs winning yet another Wakefield contest ho hum scarcely news big-news event happened following day Mulvihill event started 715 Bob got three 5-mm maxes over early decided take crack 10year-old record set George Batiuck 68 mm 54 secor 11 progressively increasing max flights last being 11 -mm flight plus 12th flight 2 mm 54 sec Weather hazy partly cloudy very little drift Bob wasnt quite prepared having brought five motors well worn ones tying broken strands became hassle Well Bob just went flight after flight maxed tenth 12-minute flight passing old record followed flight 10 mm 24 sec new record 88 mm 24 sec tell White lad comer Record Autogiro off-beat competition classes seem have affinity other somehow Ive hank ering get back autogiro record held late thirties exceptions Autogiro records have set models would have flown better rotor left home rules allow fixed wing having area almost equal rotor area trend has simply add rotor conventional model design * 22% m /24 p79 -Wi4 I rotor interfere normal flight model little possible Ive seen least rotor couldnt decide way turn convinced no necessity that true miniature autogiro could fly perfectly well blades single-rotor giro must allowed flap freely up down aircraft remain upright long Juan de la Cierva inventor giro 40 Model Aviation 4 L S N p 7j6 AMA Ccffl Opcn ecord QU1XOt6 QUAt2 bQY4K aukoglro bj trade-2 sg5ds threoa twiiea aEoed bi fiob Mti*rshi onJda farm 11 Weiqhks Air/rome Rubber Total Prop /5 /9p 4s Motor 24 bs 9 10 went thataway part Bobs discussion enjoyed bit about walking fast through house rotor tests hand glides living room goes See text coo vv I1ILu win run wi uvn uu iii daily light forthe one-flight Unlimited Mulvihill event US Free Flight Champs weighs 80 grams motor 80 grams rubber Toni White photo discovered hard way Successful flap ping-blade single-rotor giros have built seem require careful tuningmy experience hasnt happy Twin-rotor giros model man-carrying have built before twin-rotor model know reported Zaic Yearbook course used flapping blades reported tricky figured flapping blades twin would efficient rigid rotors would easier starters efficiency could come later model built sort middle-size convenience making changes Too small too large would have hassle built very light using outdoorstyle construction surfacesthe rotors included tissue-covered both sides doped fuselage indoor-style simply because appropriate unused balsa tube kicking around shop small wing half area allowed rules used support rotors simply because conventional wing construction rather efficient sort structure few fast walks through house assembled model convinced rotors doing what supposed rather well Glide tests living room got CG position incidence angles about right Yep giros glide surprisingly flat Limited flight testing indicates model docile forgiving model Ive ever built Stalls conventional sense dont happen model comes dead stop either under power glide simply drops its nose bit keeps going Lateral stability absoluteim mediate recovery no overshoot oscil lations Best flight far 122 about half what would expect equivalent conventional model under similar conditions Autogiros arent noted efficiency 122 flight time isnt great isnt too bad starters French Half-A Free Flight French style apparently like Free Flight American style course strong Big Three FAL events Coupe -a ROlnrl Cut 205-4 V 00 5stS 0101 GOtiES fl2AtbC14tS f-A tizench stjte IF Dmeosors n nflnnvers1 l 01muo4O1130101&/45I-00c noted 01111Pottero or-oW Oroit 5pars Z2 iorowood S0 Spars 3ku-dooood tubeS 2 02000Cr-S dHiver originated well curiously enough pop French magazines feature Peanut Scale ular competition event Gas has other rubber-power scale models Continued page 112 July1979 41 George Matherats 1/2 gas model unusual respects winingest 1/2 France Among Its numerous design twists thread turbulator Photo Jean Frugoli Jim Clem fuels prototype Country Boy 1/2 Underslung fin later moved aft stab accordance current fashions Kruse plc Joe Bilgri one-time Indoor champ came out retirement new models try outforthe 1980 World Champs team Joe also building Wakefield Bob Meuser photograph Quiet Power -Tatone Makes Easy new super quiet K&B 40 R/C muffler requires no exhaust plugs fittings adaptors Muffler machined fit exhaust stack cover exposed holes Just bolt on.thats Will reduce noise 10 12 decibels little no loss rpms Noise cancelled interposing sound waves eRadi cal free flow expansion chamber angled blow exhaust away fuselage attach provision pressure fitting Also available ENVA 29 35 40 45 OS MAX 30 35 40 SUPER TIGRE G21 35 46 Add $100 extra above engines specify type pie four different weights placed long board would push down different amount different place total forces downward could considered single force pushing down whatever point along board would necessary give ex actly same effect four differ ent weights resultant point called Center Gravity Therefore change weight location board will shift bal ance point original CU loca tion model nose-heavy balance point further forward rela tion designed Center Gravity Note 2 Baughmans Aviation Diction ary defines Decalage difference angles incidence wings bi plane multiplane measured acute angle between chords plane parallel plane symmetry Rightly wrongly modelers cluding author have expanded term include monoplanes refer ring difference angles inci dence wing stabilizer FF Indoor/Tenny continued page 39 311 Poinciana Dr Birmingham AL 35209 newsletter fairly new very regular usually very informative Bills labor love benefits Alabama FFFlyers group club usual sense Wood Cutting May 79 column carried comments balsa cutting some hints achieving accuracy strength seldom appreciated just what wonders achieved some better craftsmen build Indoor models Stan Chilton Wichita KS craftsmen recent Easy B models have turning times high 16 minutes Cat II sites ceiling heights between 35 100 Photo 2 shows some amazing balsa work Easy Bsand explains model well under 04-oz weight picture shows underside wing visibly tiny rib cross-sections Note main rib uses second balsa piece across bottom help hold curva ture diagonal rib pattern used stiffen wing ribs less 02 maximum dimension appear formidible cutting task Its Easyalmost Actually takes produce such part very sharp knife steady practiced hand very carefully selected wood Wood selection itself topic worthy several columns major ingredient separating top builders competition part must just strong enough carry its share load no excess balloon weight Much time spent choosing just right piece wood part needed actually build part Maxim Indoor models arent hard build just different paragraph above illustrates very well No other type model has applications different techniques Indoor models yet few basic techniques beyond skill model builders two other problems rear ugly headsa precon ceived notion what capable doingI could neverdothat becomes classic self-fulfilling prophesy lack information about some tasks accomplished experienced builder Hopefully what column about sharing various techniques aren t obvious thus encouraging interested persons try hand part model building inexpensive still challenging enough almost anyone Attention Details has noted occasionally small details make break Indoor modelers efforts Nowhere true model trim contest flying tiny shift location models CG center-of gravity wing incidence will rob seconds minutes models performance Changes humidity atmospheric pressure air temperature play part No except computer can remember details enough clarity duplicate previous successful flights make good guess about set up model fly contest inadequate time available make exhaustive test flights Dennis Jaecks really top Pennyplane fliers yet business prevents him doing much testing would comfortable keep track remember Dennis has won Pennyplane once Nats often has held records event Fig 2 shows portion several forms Dennis uses keep track important model details credits such record-keeping much success Note particular builds models interchangable parts soModelParts isaveryimportantdetail permits substitution another part minimize field repair time simply because certain combinations parts work better others Conditions heading often expanded some fliers include relative humidity atmospheric pressure Bud Tenny PO Box 545 Richardson TX 75080 FF Duration/Meuser continued page 41 slow catch labeled new classification recent magazine Frances current big name Georges Matherat curiously enough best known internationally Coupe dHiver modeler curiously enough didnt become big-time flier copying American-style machines rather went own way strange route took sure interesting fuselage model built up around fiberglass boom bones forward section consist vertical crutch mounting engine tank two timers boom imbeded aft end crutch pylon forward-fin whatever choose call makes no concessions mere esthetics Ordinary solid American-style pylons weigh have right often first thing go mild crash regarding its size doubt Americanstyle FF Gas model has suffered too much lateral area up front stab aspect-ratio mere 26 about mere can get doubt winner higher AR gives greater change stab lift given change angle-of-attack So small highAR stab can effective large lowAR model sports timer-actuated autorudder new twist trick mech anism starts DT timer Graupner engine auto-rudder timer actuates making 100% foolproof avoiding possibility launch auto-rudder glide position model built like traditional chiotte de brique employs copious quantities hardwood take pine spruce Plywood used sub-rudder core pylon All-up weight over 8 oz wing area 243 square inches measured flat Cox 112 Model Aviation 1295 Hydraulic unit converts air driven retracts hydraulic operation Adjustable give realistic re tract speeds s gear sag out landing collapse required fortwo wheel ships two three wheel types Complete instructions included $8 POSTPAID IN us Qualified Dealer Inquiries Invited OR TIlE 72DRALOCK Li SLpsTIcK MOUNTING CLIP AN0 TW0 PLOW CONTROLS ox 7399 rk Oslaware 197ff Tee Dee 051 French rules sensibly include OSis turns 25000 RPM 5inch Kavan prop heaven knows what pitch French fly 7-sec engine runs 2-mi maxes would seem would have find rather large downer order max Georges has recently added thread turbulator about -inch behind leading edge has added MRA Cup list wins model thank Georges fine original three-view drawing presented additional information Jean Frugoli Gill iaume Warner le Compte de Pisafia Rebuttle Im glad see someone paying attention tallied up cost getting Wakefield competition some $648 January issue think thats high should see bill FAI Power dont forget throw motorcycle Writing Turbulator Bob Klipp points out around four bucks youve got makings two outdoor hand-launch gliders whole spect rum competition free flight classes HL Glider undoubtedly has offer terms reward-per-buck aero modeling sport going received following note French-speaking scale modeler translate word word ensure absolute accuracy subject Pirelli $30 per book may supply dozed Peanuts account 300 years yery dear no Well ordinarily wouldnt take seriously anything said someone talks goofy point can buy enough materials build dozen Peanut-Scale models year 300 years price pound Pirelli bit exaggerated has lot truth competition events can pursued competitively very small cash outlay Peanut Scale Pennyplane Easy B P-30 Embryo Endurance throw cost winder two-year supply rubber doesnt add up whole lot Step over Towline glider events almost push HL Glider second place A/l event no means limited kiddies circle-tow zoom launches havent caught really dont have lay out $15 trick towhooks few A/i kits market todays high costs difficult see could spend $10 sticks set plans An FAI Model Supply winch plus towline will run bit over $10 Use fuse dethermalizer save close $15 Join big kids go A/2 route youll need trick towhook clockwork timer Hutchinsons Dragmaster kits will set back whoppin 30 bucks cant possibly build crash lose about A/2 Nordic year isnt unusual see five-year-old model top place AMA Gas popular really rich-mans sport Half dozen engines $60 throw $30 per airplane set timers $100 worth kits starters batteries electric starter el. Cox Tee Dee 049 plus kit plus timer bit fuel things need will get business about $60 too much adult perhaps represents lot lawn mowing youngster indeed able find such work hope AMA Gas mentioned all-foam construction April issue certainly inexpensive yet doesnt seem like thing beginning free fightertime will tell proposal low-cost beginners event designated FF-80-27 authored Dave Benepe might have helped matters got clobbered FF Contest Board Initial Vote negative vote mere one-third members condemns proposal no further consideration whatsoever no possibility modification via Cross Proposal Interim Vote procedure no possibility reaching Final Ballot could still killed one-third majority negative vote next round will make 1982 before could possibly get rulebook provisional supplemental event Benepes proposed event aimed encourage beginners age try AMA Gas free flight event would limited stock reed-valve engines Expensive clockwork timersselling now half agaln price reed-valve engineare pro hibited fuel limiting engine timing required destroys incentive anyone developing really inexpensive clockwork timer thats another story person entering event would permitted enter another Power event specific contest Kits specifically geared such event simply available nor magazine plans course plenty other kits market refined expensive model would have event idea far dead Dave isnt off corner somewhere sulking has contact some Contest Board members find out clob bered proposal getting suggestions changes might corporated future proposal considerable interest event several clubs will running unofficial event Free flight isnt dead long shot number participants stable still free flight know warrants mention Endangered Species list discour aging thing average age free fighters increasing rate almost year per year cant lead much Little new blood being pumped system free fightera Contest Board member thattold would no great concern him free flight did die 10 15 years suspect hold point view didnt wed see action aimed turning tide mere wringing hands agony wont hack encouraging see guys like Dave Benepe trying something about Too bad arent him Book Review World Free Flight Review Vol 1975-1977 edited Bill Hartill World Free Flight Press 7513 Sausalito Ave Canoga Park CA 91307 $30 plus postage doubt titanic 100-percent-free-flight publication effort ever undertaken statistics alone mind-boggling 416 pages 8 X 11 52 color photos 622 black-and-whites 109 full-page drawings emphasis outdoor World July1979 113 HURl LOCKS dealer order direct Development Inc SAVE $150 ON YOUR NEXT RADIO Buy Digital Commander Flite Pack Kit Save Money out Compromising Quality Performance Three Servo Options Two Receiver Options Kit Prices Start $7496 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct Orders 816 584-7121 AU /3 Urn] BOX 511E HIGGINSVILLE MO 64037 Custom-Dilt-RIC Built Order Plans Kit stock choose Piper Tn-Pacer Quarter-Scale 89 wIng span 42 Sq Ft detail ed plans $1699 PP Send $100 * Curtiss Hawk stomped envelope detailed listPm6~uE 60 wingspan 46 Sq Ft Built-Up RC Models 50% Sale super detailed scale plans Hobby Capitol Dist$1295 46 N Oak St ura Ca 93001 e 805 643-7616 ] Champs models flown sort competition considerable material Indoor World Champs Coupe dHiver smattering Old-Timer modeling Free Flight US style exemplified US Free Flight Champs sections about developments techniques associated model class written some knowledgable fliers business blow-by-blow accounts of major international World Champ competitions period covered complete listings results full-page plans occupy about half book accompanied story about history development model modelers own words About 90% plans have appeared publi cations available US FAT fliers Scatter Free Flight News NFFS Dig est Indoor News Views forth nice having under cover Most color photos truly excellent could have perfectly happy postcard shots lArc de Triumph le Tour Eiffel some family-album type snapshots Never theless whole photos document spirit international free flight compe titionits triumphs tragedies glories defeats pure fun itin addition its technology book red-blooded American FAT-oriented free flighter would proud own AnnouncemenL Fresno Annual September 29-30 weekend will see fortieth consecutive annual contest put Fresno Gas Model Airplane Club Events will include three FAT events l/2A B C D Gas Coupe P-30 Mulvihill A- 1 Glider Hand Launch Glider perhaps few others Stockton clubs Old-tinier Meet will held simul taneously same site Last years annual drew 155 contestants $2200 worth prizes including en graved silver-plate bowls sweep stakes winners years meet promises bigger better respect site sheep-grazing land 1 X 1 miles criss-crossed paved roads quartermile intervals Motorcycles OK Con tact man Russ James 4840 E Leisure Fresno CA 93727 Call 209 2552422 anytime Also something new Fresno club will series Tndoor meets first will June 23 Check Russ details Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about Model Aviation Combat Trends/Rush continued page 53 Gary James Steve Sacco have modi fied NACA formula change such things LE radius TE angle best airfoil use depends also wing surface bumpiness Surface imperfec tions near LE really degrade Neme sis IT airfoils performance foamies get away bumpy surfaces using really blunt LEs Tm using Gary James-modified NACA airfoil fat LE foamy works great New airfoil design techniques have developed last few years may make airfoil design scientific spoil fun techniques consist determin ing what pressure distribution want calculating shape gives FX Wortmann University Stuttgart has designed some new fangled airfoils full-scale sailplane tail surfaces operate same Reynolds numbers design conditions Combat models wind tunnel data show im provement over old NACA airfoils Combat fliers have shown little interest trying new sectionsprobably because look different have pretty sharp LEs concave near TE Want first kid block try StuttgarterProfilkatalog D Althaus published Institute fur Aero-u Gasdynamik University Stuttgart Germany 1972 Configuration Airplanes bigger now several reasons Combat planes must turn tight fast loops minimum loop diameter airplane can turn proportional its wing area loadingif other factors dont change Area loading ratio weight wing area speed airplane can maintain consecutive maneuvers depends its duced drag given loop size speed induced drag proportional square span loading Span loading ratio weight wingspan Foamies need lots wing area span make up foams weight dis advantage Because engine fuel line weight constant get lower area loading span loading going bigger longer wing AMA-class foamies typically have 42 48 spans 360 400 sq areas compared 39 spans 320 360 sq areas conven tional planes Conventional-construction airplanes have practical wing span limits Balsa comes 36 lengths span means buying more-expensive 48 wood Itis also harder keep warps out longer wings Sherwood Buckstaff Texan col leagues kept 36 span increased chord l0an inch standard planes timeand gained area loading advantage over us paid area increased drag 114 Model Aviation
Edition: Model Aviation - 1979/07
Page Numbers: 40, 41, 112, 113, 114
BOB WHITE Does Again Bob won Wakefield event held first day two-day California Eagles Annual Taft March Bobs winning yet another Wakefield contest ho hum scarcely news big-news event happened following day Mulvihill event started 715 Bob got three 5-mm maxes over early decided take crack 10year-old record set George Batiuck 68 mm 54 secor 11 progressively increasing max flights last being 11 -mm flight plus 12th flight 2 mm 54 sec Weather hazy partly cloudy very little drift Bob wasnt quite prepared having brought five motors well worn ones tying broken strands became hassle Well Bob just went flight after flight maxed tenth 12-minute flight passing old record followed flight 10 mm 24 sec new record 88 mm 24 sec tell White lad comer Record Autogiro off-beat competition classes seem have affinity other somehow Ive hank ering get back autogiro record held late thirties exceptions Autogiro records have set models would have flown better rotor left home rules allow fixed wing having area almost equal rotor area trend has simply add rotor conventional model design * 22% m /24 p79 -Wi4 I rotor interfere normal flight model little possible Ive seen least rotor couldnt decide way turn convinced no necessity that true miniature autogiro could fly perfectly well blades single-rotor giro must allowed flap freely up down aircraft remain upright long Juan de la Cierva inventor giro 40 Model Aviation 4 L S N p 7j6 AMA Ccffl Opcn ecord QU1XOt6 QUAt2 bQY4K aukoglro bj trade-2 sg5ds threoa twiiea aEoed bi fiob Mti*rshi onJda farm 11 Weiqhks Air/rome Rubber Total Prop /5 /9p 4s Motor 24 bs 9 10 went thataway part Bobs discussion enjoyed bit about walking fast through house rotor tests hand glides living room goes See text coo vv I1ILu win run wi uvn uu iii daily light forthe one-flight Unlimited Mulvihill event US Free Flight Champs weighs 80 grams motor 80 grams rubber Toni White photo discovered hard way Successful flap ping-blade single-rotor giros have built seem require careful tuningmy experience hasnt happy Twin-rotor giros model man-carrying have built before twin-rotor model know reported Zaic Yearbook course used flapping blades reported tricky figured flapping blades twin would efficient rigid rotors would easier starters efficiency could come later model built sort middle-size convenience making changes Too small too large would have hassle built very light using outdoorstyle construction surfacesthe rotors included tissue-covered both sides doped fuselage indoor-style simply because appropriate unused balsa tube kicking around shop small wing half area allowed rules used support rotors simply because conventional wing construction rather efficient sort structure few fast walks through house assembled model convinced rotors doing what supposed rather well Glide tests living room got CG position incidence angles about right Yep giros glide surprisingly flat Limited flight testing indicates model docile forgiving model Ive ever built Stalls conventional sense dont happen model comes dead stop either under power glide simply drops its nose bit keeps going Lateral stability absoluteim mediate recovery no overshoot oscil lations Best flight far 122 about half what would expect equivalent conventional model under similar conditions Autogiros arent noted efficiency 122 flight time isnt great isnt too bad starters French Half-A Free Flight French style apparently like Free Flight American style course strong Big Three FAL events Coupe -a ROlnrl Cut 205-4 V 00 5stS 0101 GOtiES fl2AtbC14tS f-A tizench stjte IF Dmeosors n nflnnvers1 l 01muo4O1130101&/45I-00c noted 01111Pottero or-oW Oroit 5pars Z2 iorowood S0 Spars 3ku-dooood tubeS 2 02000Cr-S dHiver originated well curiously enough pop French magazines feature Peanut Scale ular competition event Gas has other rubber-power scale models Continued page 112 July1979 41 George Matherats 1/2 gas model unusual respects winingest 1/2 France Among Its numerous design twists thread turbulator Photo Jean Frugoli Jim Clem fuels prototype Country Boy 1/2 Underslung fin later moved aft stab accordance current fashions Kruse plc Joe Bilgri one-time Indoor champ came out retirement new models try outforthe 1980 World Champs team Joe also building Wakefield Bob Meuser photograph Quiet Power -Tatone Makes Easy new super quiet K&B 40 R/C muffler requires no exhaust plugs fittings adaptors Muffler machined fit exhaust stack cover exposed holes Just bolt on.thats Will reduce noise 10 12 decibels little no loss rpms Noise cancelled interposing sound waves eRadi cal free flow expansion chamber angled blow exhaust away fuselage attach provision pressure fitting Also available ENVA 29 35 40 45 OS MAX 30 35 40 SUPER TIGRE G21 35 46 Add $100 extra above engines specify type pie four different weights placed long board would push down different amount different place total forces downward could considered single force pushing down whatever point along board would necessary give ex actly same effect four differ ent weights resultant point called Center Gravity Therefore change weight location board will shift bal ance point original CU loca tion model nose-heavy balance point further forward rela tion designed Center Gravity Note 2 Baughmans Aviation Diction ary defines Decalage difference angles incidence wings bi plane multiplane measured acute angle between chords plane parallel plane symmetry Rightly wrongly modelers cluding author have expanded term include monoplanes refer ring difference angles inci dence wing stabilizer FF Indoor/Tenny continued page 39 311 Poinciana Dr Birmingham AL 35209 newsletter fairly new very regular usually very informative Bills labor love benefits Alabama FFFlyers group club usual sense Wood Cutting May 79 column carried comments balsa cutting some hints achieving accuracy strength seldom appreciated just what wonders achieved some better craftsmen build Indoor models Stan Chilton Wichita KS craftsmen recent Easy B models have turning times high 16 minutes Cat II sites ceiling heights between 35 100 Photo 2 shows some amazing balsa work Easy Bsand explains model well under 04-oz weight picture shows underside wing visibly tiny rib cross-sections Note main rib uses second balsa piece across bottom help hold curva ture diagonal rib pattern used stiffen wing ribs less 02 maximum dimension appear formidible cutting task Its Easyalmost Actually takes produce such part very sharp knife steady practiced hand very carefully selected wood Wood selection itself topic worthy several columns major ingredient separating top builders competition part must just strong enough carry its share load no excess balloon weight Much time spent choosing just right piece wood part needed actually build part Maxim Indoor models arent hard build just different paragraph above illustrates very well No other type model has applications different techniques Indoor models yet few basic techniques beyond skill model builders two other problems rear ugly headsa precon ceived notion what capable doingI could neverdothat becomes classic self-fulfilling prophesy lack information about some tasks accomplished experienced builder Hopefully what column about sharing various techniques aren t obvious thus encouraging interested persons try hand part model building inexpensive still challenging enough almost anyone Attention Details has noted occasionally small details make break Indoor modelers efforts Nowhere true model trim contest flying tiny shift location models CG center-of gravity wing incidence will rob seconds minutes models performance Changes humidity atmospheric pressure air temperature play part No except computer can remember details enough clarity duplicate previous successful flights make good guess about set up model fly contest inadequate time available make exhaustive test flights Dennis Jaecks really top Pennyplane fliers yet business prevents him doing much testing would comfortable keep track remember Dennis has won Pennyplane once Nats often has held records event Fig 2 shows portion several forms Dennis uses keep track important model details credits such record-keeping much success Note particular builds models interchangable parts soModelParts isaveryimportantdetail permits substitution another part minimize field repair time simply because certain combinations parts work better others Conditions heading often expanded some fliers include relative humidity atmospheric pressure Bud Tenny PO Box 545 Richardson TX 75080 FF Duration/Meuser continued page 41 slow catch labeled new classification recent magazine Frances current big name Georges Matherat curiously enough best known internationally Coupe dHiver modeler curiously enough didnt become big-time flier copying American-style machines rather went own way strange route took sure interesting fuselage model built up around fiberglass boom bones forward section consist vertical crutch mounting engine tank two timers boom imbeded aft end crutch pylon forward-fin whatever choose call makes no concessions mere esthetics Ordinary solid American-style pylons weigh have right often first thing go mild crash regarding its size doubt Americanstyle FF Gas model has suffered too much lateral area up front stab aspect-ratio mere 26 about mere can get doubt winner higher AR gives greater change stab lift given change angle-of-attack So small highAR stab can effective large lowAR model sports timer-actuated autorudder new twist trick mech anism starts DT timer Graupner engine auto-rudder timer actuates making 100% foolproof avoiding possibility launch auto-rudder glide position model built like traditional chiotte de brique employs copious quantities hardwood take pine spruce Plywood used sub-rudder core pylon All-up weight over 8 oz wing area 243 square inches measured flat Cox 112 Model Aviation 1295 Hydraulic unit converts air driven retracts hydraulic operation Adjustable give realistic re tract speeds s gear sag out landing collapse required fortwo wheel ships two three wheel types Complete instructions included $8 POSTPAID IN us Qualified Dealer Inquiries Invited OR TIlE 72DRALOCK Li SLpsTIcK MOUNTING CLIP AN0 TW0 PLOW CONTROLS ox 7399 rk Oslaware 197ff Tee Dee 051 French rules sensibly include OSis turns 25000 RPM 5inch Kavan prop heaven knows what pitch French fly 7-sec engine runs 2-mi maxes would seem would have find rather large downer order max Georges has recently added thread turbulator about -inch behind leading edge has added MRA Cup list wins model thank Georges fine original three-view drawing presented additional information Jean Frugoli Gill iaume Warner le Compte de Pisafia Rebuttle Im glad see someone paying attention tallied up cost getting Wakefield competition some $648 January issue think thats high should see bill FAI Power dont forget throw motorcycle Writing Turbulator Bob Klipp points out around four bucks youve got makings two outdoor hand-launch gliders whole spect rum competition free flight classes HL Glider undoubtedly has offer terms reward-per-buck aero modeling sport going received following note French-speaking scale modeler translate word word ensure absolute accuracy subject Pirelli $30 per book may supply dozed Peanuts account 300 years yery dear no Well ordinarily wouldnt take seriously anything said someone talks goofy point can buy enough materials build dozen Peanut-Scale models year 300 years price pound Pirelli bit exaggerated has lot truth competition events can pursued competitively very small cash outlay Peanut Scale Pennyplane Easy B P-30 Embryo Endurance throw cost winder two-year supply rubber doesnt add up whole lot Step over Towline glider events almost push HL Glider second place A/l event no means limited kiddies circle-tow zoom launches havent caught really dont have lay out $15 trick towhooks few A/i kits market todays high costs difficult see could spend $10 sticks set plans An FAI Model Supply winch plus towline will run bit over $10 Use fuse dethermalizer save close $15 Join big kids go A/2 route youll need trick towhook clockwork timer Hutchinsons Dragmaster kits will set back whoppin 30 bucks cant possibly build crash lose about A/2 Nordic year isnt unusual see five-year-old model top place AMA Gas popular really rich-mans sport Half dozen engines $60 throw $30 per airplane set timers $100 worth kits starters batteries electric starter el. Cox Tee Dee 049 plus kit plus timer bit fuel things need will get business about $60 too much adult perhaps represents lot lawn mowing youngster indeed able find such work hope AMA Gas mentioned all-foam construction April issue certainly inexpensive yet doesnt seem like thing beginning free fightertime will tell proposal low-cost beginners event designated FF-80-27 authored Dave Benepe might have helped matters got clobbered FF Contest Board Initial Vote negative vote mere one-third members condemns proposal no further consideration whatsoever no possibility modification via Cross Proposal Interim Vote procedure no possibility reaching Final Ballot could still killed one-third majority negative vote next round will make 1982 before could possibly get rulebook provisional supplemental event Benepes proposed event aimed encourage beginners age try AMA Gas free flight event would limited stock reed-valve engines Expensive clockwork timersselling now half agaln price reed-valve engineare pro hibited fuel limiting engine timing required destroys incentive anyone developing really inexpensive clockwork timer thats another story person entering event would permitted enter another Power event specific contest Kits specifically geared such event simply available nor magazine plans course plenty other kits market refined expensive model would have event idea far dead Dave isnt off corner somewhere sulking has contact some Contest Board members find out clob bered proposal getting suggestions changes might corporated future proposal considerable interest event several clubs will running unofficial event Free flight isnt dead long shot number participants stable still free flight know warrants mention Endangered Species list discour aging thing average age free fighters increasing rate almost year per year cant lead much Little new blood being pumped system free fightera Contest Board member thattold would no great concern him free flight did die 10 15 years suspect hold point view didnt wed see action aimed turning tide mere wringing hands agony wont hack encouraging see guys like Dave Benepe trying something about Too bad arent him Book Review World Free Flight Review Vol 1975-1977 edited Bill Hartill World Free Flight Press 7513 Sausalito Ave Canoga Park CA 91307 $30 plus postage doubt titanic 100-percent-free-flight publication effort ever undertaken statistics alone mind-boggling 416 pages 8 X 11 52 color photos 622 black-and-whites 109 full-page drawings emphasis outdoor World July1979 113 HURl LOCKS dealer order direct Development Inc SAVE $150 ON YOUR NEXT RADIO Buy Digital Commander Flite Pack Kit Save Money out Compromising Quality Performance Three Servo Options Two Receiver Options Kit Prices Start $7496 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct Orders 816 584-7121 AU /3 Urn] BOX 511E HIGGINSVILLE MO 64037 Custom-Dilt-RIC Built Order Plans Kit stock choose Piper Tn-Pacer Quarter-Scale 89 wIng span 42 Sq Ft detail ed plans $1699 PP Send $100 * Curtiss Hawk stomped envelope detailed listPm6~uE 60 wingspan 46 Sq Ft Built-Up RC Models 50% Sale super detailed scale plans Hobby Capitol Dist$1295 46 N Oak St ura Ca 93001 e 805 643-7616 ] Champs models flown sort competition considerable material Indoor World Champs Coupe dHiver smattering Old-Timer modeling Free Flight US style exemplified US Free Flight Champs sections about developments techniques associated model class written some knowledgable fliers business blow-by-blow accounts of major international World Champ competitions period covered complete listings results full-page plans occupy about half book accompanied story about history development model modelers own words About 90% plans have appeared publi cations available US FAT fliers Scatter Free Flight News NFFS Dig est Indoor News Views forth nice having under cover Most color photos truly excellent could have perfectly happy postcard shots lArc de Triumph le Tour Eiffel some family-album type snapshots Never theless whole photos document spirit international free flight compe titionits triumphs tragedies glories defeats pure fun itin addition its technology book red-blooded American FAT-oriented free flighter would proud own AnnouncemenL Fresno Annual September 29-30 weekend will see fortieth consecutive annual contest put Fresno Gas Model Airplane Club Events will include three FAT events l/2A B C D Gas Coupe P-30 Mulvihill A- 1 Glider Hand Launch Glider perhaps few others Stockton clubs Old-tinier Meet will held simul taneously same site Last years annual drew 155 contestants $2200 worth prizes including en graved silver-plate bowls sweep stakes winners years meet promises bigger better respect site sheep-grazing land 1 X 1 miles criss-crossed paved roads quartermile intervals Motorcycles OK Con tact man Russ James 4840 E Leisure Fresno CA 93727 Call 209 2552422 anytime Also something new Fresno club will series Tndoor meets first will June 23 Check Russ details Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about Model Aviation Combat Trends/Rush continued page 53 Gary James Steve Sacco have modi fied NACA formula change such things LE radius TE angle best airfoil use depends also wing surface bumpiness Surface imperfec tions near LE really degrade Neme sis IT airfoils performance foamies get away bumpy surfaces using really blunt LEs Tm using Gary James-modified NACA airfoil fat LE foamy works great New airfoil design techniques have developed last few years may make airfoil design scientific spoil fun techniques consist determin ing what pressure distribution want calculating shape gives FX Wortmann University Stuttgart has designed some new fangled airfoils full-scale sailplane tail surfaces operate same Reynolds numbers design conditions Combat models wind tunnel data show im provement over old NACA airfoils Combat fliers have shown little interest trying new sectionsprobably because look different have pretty sharp LEs concave near TE Want first kid block try StuttgarterProfilkatalog D Althaus published Institute fur Aero-u Gasdynamik University Stuttgart Germany 1972 Configuration Airplanes bigger now several reasons Combat planes must turn tight fast loops minimum loop diameter airplane can turn proportional its wing area loadingif other factors dont change Area loading ratio weight wing area speed airplane can maintain consecutive maneuvers depends its duced drag given loop size speed induced drag proportional square span loading Span loading ratio weight wingspan Foamies need lots wing area span make up foams weight dis advantage Because engine fuel line weight constant get lower area loading span loading going bigger longer wing AMA-class foamies typically have 42 48 spans 360 400 sq areas compared 39 spans 320 360 sq areas conven tional planes Conventional-construction airplanes have practical wing span limits Balsa comes 36 lengths span means buying more-expensive 48 wood Itis also harder keep warps out longer wings Sherwood Buckstaff Texan col leagues kept 36 span increased chord l0an inch standard planes timeand gained area loading advantage over us paid area increased drag 114 Model Aviation
Edition: Model Aviation - 1979/07
Page Numbers: 40, 41, 112, 113, 114
BOB WHITE Does Again Bob won Wakefield event held first day two-day California Eagles Annual Taft March Bobs winning yet another Wakefield contest ho hum scarcely news big-news event happened following day Mulvihill event started 715 Bob got three 5-mm maxes over early decided take crack 10year-old record set George Batiuck 68 mm 54 secor 11 progressively increasing max flights last being 11 -mm flight plus 12th flight 2 mm 54 sec Weather hazy partly cloudy very little drift Bob wasnt quite prepared having brought five motors well worn ones tying broken strands became hassle Well Bob just went flight after flight maxed tenth 12-minute flight passing old record followed flight 10 mm 24 sec new record 88 mm 24 sec tell White lad comer Record Autogiro off-beat competition classes seem have affinity other somehow Ive hank ering get back autogiro record held late thirties exceptions Autogiro records have set models would have flown better rotor left home rules allow fixed wing having area almost equal rotor area trend has simply add rotor conventional model design * 22% m /24 p79 -Wi4 I rotor interfere normal flight model little possible Ive seen least rotor couldnt decide way turn convinced no necessity that true miniature autogiro could fly perfectly well blades single-rotor giro must allowed flap freely up down aircraft remain upright long Juan de la Cierva inventor giro 40 Model Aviation 4 L S N p 7j6 AMA Ccffl Opcn ecord QU1XOt6 QUAt2 bQY4K aukoglro bj trade-2 sg5ds threoa twiiea aEoed bi fiob Mti*rshi onJda farm 11 Weiqhks Air/rome Rubber Total Prop /5 /9p 4s Motor 24 bs 9 10 went thataway part Bobs discussion enjoyed bit about walking fast through house rotor tests hand glides living room goes See text coo vv I1ILu win run wi uvn uu iii daily light forthe one-flight Unlimited Mulvihill event US Free Flight Champs weighs 80 grams motor 80 grams rubber Toni White photo discovered hard way Successful flap ping-blade single-rotor giros have built seem require careful tuningmy experience hasnt happy Twin-rotor giros model man-carrying have built before twin-rotor model know reported Zaic Yearbook course used flapping blades reported tricky figured flapping blades twin would efficient rigid rotors would easier starters efficiency could come later model built sort middle-size convenience making changes Too small too large would have hassle built very light using outdoorstyle construction surfacesthe rotors included tissue-covered both sides doped fuselage indoor-style simply because appropriate unused balsa tube kicking around shop small wing half area allowed rules used support rotors simply because conventional wing construction rather efficient sort structure few fast walks through house assembled model convinced rotors doing what supposed rather well Glide tests living room got CG position incidence angles about right Yep giros glide surprisingly flat Limited flight testing indicates model docile forgiving model Ive ever built Stalls conventional sense dont happen model comes dead stop either under power glide simply drops its nose bit keeps going Lateral stability absoluteim mediate recovery no overshoot oscil lations Best flight far 122 about half what would expect equivalent conventional model under similar conditions Autogiros arent noted efficiency 122 flight time isnt great isnt too bad starters French Half-A Free Flight French style apparently like Free Flight American style course strong Big Three FAL events Coupe -a ROlnrl Cut 205-4 V 00 5stS 0101 GOtiES fl2AtbC14tS f-A tizench stjte IF Dmeosors n nflnnvers1 l 01muo4O1130101&/45I-00c noted 01111Pottero or-oW Oroit 5pars Z2 iorowood S0 Spars 3ku-dooood tubeS 2 02000Cr-S dHiver originated well curiously enough pop French magazines feature Peanut Scale ular competition event Gas has other rubber-power scale models Continued page 112 July1979 41 George Matherats 1/2 gas model unusual respects winingest 1/2 France Among Its numerous design twists thread turbulator Photo Jean Frugoli Jim Clem fuels prototype Country Boy 1/2 Underslung fin later moved aft stab accordance current fashions Kruse plc Joe Bilgri one-time Indoor champ came out retirement new models try outforthe 1980 World Champs team Joe also building Wakefield Bob Meuser photograph Quiet Power -Tatone Makes Easy new super quiet K&B 40 R/C muffler requires no exhaust plugs fittings adaptors Muffler machined fit exhaust stack cover exposed holes Just bolt on.thats Will reduce noise 10 12 decibels little no loss rpms Noise cancelled interposing sound waves eRadi cal free flow expansion chamber angled blow exhaust away fuselage attach provision pressure fitting Also available ENVA 29 35 40 45 OS MAX 30 35 40 SUPER TIGRE G21 35 46 Add $100 extra above engines specify type pie four different weights placed long board would push down different amount different place total forces downward could considered single force pushing down whatever point along board would necessary give ex actly same effect four differ ent weights resultant point called Center Gravity Therefore change weight location board will shift bal ance point original CU loca tion model nose-heavy balance point further forward rela tion designed Center Gravity Note 2 Baughmans Aviation Diction ary defines Decalage difference angles incidence wings bi plane multiplane measured acute angle between chords plane parallel plane symmetry Rightly wrongly modelers cluding author have expanded term include monoplanes refer ring difference angles inci dence wing stabilizer FF Indoor/Tenny continued page 39 311 Poinciana Dr Birmingham AL 35209 newsletter fairly new very regular usually very informative Bills labor love benefits Alabama FFFlyers group club usual sense Wood Cutting May 79 column carried comments balsa cutting some hints achieving accuracy strength seldom appreciated just what wonders achieved some better craftsmen build Indoor models Stan Chilton Wichita KS craftsmen recent Easy B models have turning times high 16 minutes Cat II sites ceiling heights between 35 100 Photo 2 shows some amazing balsa work Easy Bsand explains model well under 04-oz weight picture shows underside wing visibly tiny rib cross-sections Note main rib uses second balsa piece across bottom help hold curva ture diagonal rib pattern used stiffen wing ribs less 02 maximum dimension appear formidible cutting task Its Easyalmost Actually takes produce such part very sharp knife steady practiced hand very carefully selected wood Wood selection itself topic worthy several columns major ingredient separating top builders competition part must just strong enough carry its share load no excess balloon weight Much time spent choosing just right piece wood part needed actually build part Maxim Indoor models arent hard build just different paragraph above illustrates very well No other type model has applications different techniques Indoor models yet few basic techniques beyond skill model builders two other problems rear ugly headsa precon ceived notion what capable doingI could neverdothat becomes classic self-fulfilling prophesy lack information about some tasks accomplished experienced builder Hopefully what column about sharing various techniques aren t obvious thus encouraging interested persons try hand part model building inexpensive still challenging enough almost anyone Attention Details has noted occasionally small details make break Indoor modelers efforts Nowhere true model trim contest flying tiny shift location models CG center-of gravity wing incidence will rob seconds minutes models performance Changes humidity atmospheric pressure air temperature play part No except computer can remember details enough clarity duplicate previous successful flights make good guess about set up model fly contest inadequate time available make exhaustive test flights Dennis Jaecks really top Pennyplane fliers yet business prevents him doing much testing would comfortable keep track remember Dennis has won Pennyplane once Nats often has held records event Fig 2 shows portion several forms Dennis uses keep track important model details credits such record-keeping much success Note particular builds models interchangable parts soModelParts isaveryimportantdetail permits substitution another part minimize field repair time simply because certain combinations parts work better others Conditions heading often expanded some fliers include relative humidity atmospheric pressure Bud Tenny PO Box 545 Richardson TX 75080 FF Duration/Meuser continued page 41 slow catch labeled new classification recent magazine Frances current big name Georges Matherat curiously enough best known internationally Coupe dHiver modeler curiously enough didnt become big-time flier copying American-style machines rather went own way strange route took sure interesting fuselage model built up around fiberglass boom bones forward section consist vertical crutch mounting engine tank two timers boom imbeded aft end crutch pylon forward-fin whatever choose call makes no concessions mere esthetics Ordinary solid American-style pylons weigh have right often first thing go mild crash regarding its size doubt Americanstyle FF Gas model has suffered too much lateral area up front stab aspect-ratio mere 26 about mere can get doubt winner higher AR gives greater change stab lift given change angle-of-attack So small highAR stab can effective large lowAR model sports timer-actuated autorudder new twist trick mech anism starts DT timer Graupner engine auto-rudder timer actuates making 100% foolproof avoiding possibility launch auto-rudder glide position model built like traditional chiotte de brique employs copious quantities hardwood take pine spruce Plywood used sub-rudder core pylon All-up weight over 8 oz wing area 243 square inches measured flat Cox 112 Model Aviation 1295 Hydraulic unit converts air driven retracts hydraulic operation Adjustable give realistic re tract speeds s gear sag out landing collapse required fortwo wheel ships two three wheel types Complete instructions included $8 POSTPAID IN us Qualified Dealer Inquiries Invited OR TIlE 72DRALOCK Li SLpsTIcK MOUNTING CLIP AN0 TW0 PLOW CONTROLS ox 7399 rk Oslaware 197ff Tee Dee 051 French rules sensibly include OSis turns 25000 RPM 5inch Kavan prop heaven knows what pitch French fly 7-sec engine runs 2-mi maxes would seem would have find rather large downer order max Georges has recently added thread turbulator about -inch behind leading edge has added MRA Cup list wins model thank Georges fine original three-view drawing presented additional information Jean Frugoli Gill iaume Warner le Compte de Pisafia Rebuttle Im glad see someone paying attention tallied up cost getting Wakefield competition some $648 January issue think thats high should see bill FAI Power dont forget throw motorcycle Writing Turbulator Bob Klipp points out around four bucks youve got makings two outdoor hand-launch gliders whole spect rum competition free flight classes HL Glider undoubtedly has offer terms reward-per-buck aero modeling sport going received following note French-speaking scale modeler translate word word ensure absolute accuracy subject Pirelli $30 per book may supply dozed Peanuts account 300 years yery dear no Well ordinarily wouldnt take seriously anything said someone talks goofy point can buy enough materials build dozen Peanut-Scale models year 300 years price pound Pirelli bit exaggerated has lot truth competition events can pursued competitively very small cash outlay Peanut Scale Pennyplane Easy B P-30 Embryo Endurance throw cost winder two-year supply rubber doesnt add up whole lot Step over Towline glider events almost push HL Glider second place A/l event no means limited kiddies circle-tow zoom launches havent caught really dont have lay out $15 trick towhooks few A/i kits market todays high costs difficult see could spend $10 sticks set plans An FAI Model Supply winch plus towline will run bit over $10 Use fuse dethermalizer save close $15 Join big kids go A/2 route youll need trick towhook clockwork timer Hutchinsons Dragmaster kits will set back whoppin 30 bucks cant possibly build crash lose about A/2 Nordic year isnt unusual see five-year-old model top place AMA Gas popular really rich-mans sport Half dozen engines $60 throw $30 per airplane set timers $100 worth kits starters batteries electric starter el. Cox Tee Dee 049 plus kit plus timer bit fuel things need will get business about $60 too much adult perhaps represents lot lawn mowing youngster indeed able find such work hope AMA Gas mentioned all-foam construction April issue certainly inexpensive yet doesnt seem like thing beginning free fightertime will tell proposal low-cost beginners event designated FF-80-27 authored Dave Benepe might have helped matters got clobbered FF Contest Board Initial Vote negative vote mere one-third members condemns proposal no further consideration whatsoever no possibility modification via Cross Proposal Interim Vote procedure no possibility reaching Final Ballot could still killed one-third majority negative vote next round will make 1982 before could possibly get rulebook provisional supplemental event Benepes proposed event aimed encourage beginners age try AMA Gas free flight event would limited stock reed-valve engines Expensive clockwork timersselling now half agaln price reed-valve engineare pro hibited fuel limiting engine timing required destroys incentive anyone developing really inexpensive clockwork timer thats another story person entering event would permitted enter another Power event specific contest Kits specifically geared such event simply available nor magazine plans course plenty other kits market refined expensive model would have event idea far dead Dave isnt off corner somewhere sulking has contact some Contest Board members find out clob bered proposal getting suggestions changes might corporated future proposal considerable interest event several clubs will running unofficial event Free flight isnt dead long shot number participants stable still free flight know warrants mention Endangered Species list discour aging thing average age free fighters increasing rate almost year per year cant lead much Little new blood being pumped system free fightera Contest Board member thattold would no great concern him free flight did die 10 15 years suspect hold point view didnt wed see action aimed turning tide mere wringing hands agony wont hack encouraging see guys like Dave Benepe trying something about Too bad arent him Book Review World Free Flight Review Vol 1975-1977 edited Bill Hartill World Free Flight Press 7513 Sausalito Ave Canoga Park CA 91307 $30 plus postage doubt titanic 100-percent-free-flight publication effort ever undertaken statistics alone mind-boggling 416 pages 8 X 11 52 color photos 622 black-and-whites 109 full-page drawings emphasis outdoor World July1979 113 HURl LOCKS dealer order direct Development Inc SAVE $150 ON YOUR NEXT RADIO Buy Digital Commander Flite Pack Kit Save Money out Compromising Quality Performance Three Servo Options Two Receiver Options Kit Prices Start $7496 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct Orders 816 584-7121 AU /3 Urn] BOX 511E HIGGINSVILLE MO 64037 Custom-Dilt-RIC Built Order Plans Kit stock choose Piper Tn-Pacer Quarter-Scale 89 wIng span 42 Sq Ft detail ed plans $1699 PP Send $100 * Curtiss Hawk stomped envelope detailed listPm6~uE 60 wingspan 46 Sq Ft Built-Up RC Models 50% Sale super detailed scale plans Hobby Capitol Dist$1295 46 N Oak St ura Ca 93001 e 805 643-7616 ] Champs models flown sort competition considerable material Indoor World Champs Coupe dHiver smattering Old-Timer modeling Free Flight US style exemplified US Free Flight Champs sections about developments techniques associated model class written some knowledgable fliers business blow-by-blow accounts of major international World Champ competitions period covered complete listings results full-page plans occupy about half book accompanied story about history development model modelers own words About 90% plans have appeared publi cations available US FAT fliers Scatter Free Flight News NFFS Dig est Indoor News Views forth nice having under cover Most color photos truly excellent could have perfectly happy postcard shots lArc de Triumph le Tour Eiffel some family-album type snapshots Never theless whole photos document spirit international free flight compe titionits triumphs tragedies glories defeats pure fun itin addition its technology book red-blooded American FAT-oriented free flighter would proud own AnnouncemenL Fresno Annual September 29-30 weekend will see fortieth consecutive annual contest put Fresno Gas Model Airplane Club Events will include three FAT events l/2A B C D Gas Coupe P-30 Mulvihill A- 1 Glider Hand Launch Glider perhaps few others Stockton clubs Old-tinier Meet will held simul taneously same site Last years annual drew 155 contestants $2200 worth prizes including en graved silver-plate bowls sweep stakes winners years meet promises bigger better respect site sheep-grazing land 1 X 1 miles criss-crossed paved roads quartermile intervals Motorcycles OK Con tact man Russ James 4840 E Leisure Fresno CA 93727 Call 209 2552422 anytime Also something new Fresno club will series Tndoor meets first will June 23 Check Russ details Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about Model Aviation Combat Trends/Rush continued page 53 Gary James Steve Sacco have modi fied NACA formula change such things LE radius TE angle best airfoil use depends also wing surface bumpiness Surface imperfec tions near LE really degrade Neme sis IT airfoils performance foamies get away bumpy surfaces using really blunt LEs Tm using Gary James-modified NACA airfoil fat LE foamy works great New airfoil design techniques have developed last few years may make airfoil design scientific spoil fun techniques consist determin ing what pressure distribution want calculating shape gives FX Wortmann University Stuttgart has designed some new fangled airfoils full-scale sailplane tail surfaces operate same Reynolds numbers design conditions Combat models wind tunnel data show im provement over old NACA airfoils Combat fliers have shown little interest trying new sectionsprobably because look different have pretty sharp LEs concave near TE Want first kid block try StuttgarterProfilkatalog D Althaus published Institute fur Aero-u Gasdynamik University Stuttgart Germany 1972 Configuration Airplanes bigger now several reasons Combat planes must turn tight fast loops minimum loop diameter airplane can turn proportional its wing area loadingif other factors dont change Area loading ratio weight wing area speed airplane can maintain consecutive maneuvers depends its duced drag given loop size speed induced drag proportional square span loading Span loading ratio weight wingspan Foamies need lots wing area span make up foams weight dis advantage Because engine fuel line weight constant get lower area loading span loading going bigger longer wing AMA-class foamies typically have 42 48 spans 360 400 sq areas compared 39 spans 320 360 sq areas conven tional planes Conventional-construction airplanes have practical wing span limits Balsa comes 36 lengths span means buying more-expensive 48 wood Itis also harder keep warps out longer wings Sherwood Buckstaff Texan col leagues kept 36 span increased chord l0an inch standard planes timeand gained area loading advantage over us paid area increased drag 114 Model Aviation
Edition: Model Aviation - 1979/07
Page Numbers: 40, 41, 112, 113, 114
BOB WHITE Does Again Bob won Wakefield event held first day two-day California Eagles Annual Taft March Bobs winning yet another Wakefield contest ho hum scarcely news big-news event happened following day Mulvihill event started 715 Bob got three 5-mm maxes over early decided take crack 10year-old record set George Batiuck 68 mm 54 secor 11 progressively increasing max flights last being 11 -mm flight plus 12th flight 2 mm 54 sec Weather hazy partly cloudy very little drift Bob wasnt quite prepared having brought five motors well worn ones tying broken strands became hassle Well Bob just went flight after flight maxed tenth 12-minute flight passing old record followed flight 10 mm 24 sec new record 88 mm 24 sec tell White lad comer Record Autogiro off-beat competition classes seem have affinity other somehow Ive hank ering get back autogiro record held late thirties exceptions Autogiro records have set models would have flown better rotor left home rules allow fixed wing having area almost equal rotor area trend has simply add rotor conventional model design * 22% m /24 p79 -Wi4 I rotor interfere normal flight model little possible Ive seen least rotor couldnt decide way turn convinced no necessity that true miniature autogiro could fly perfectly well blades single-rotor giro must allowed flap freely up down aircraft remain upright long Juan de la Cierva inventor giro 40 Model Aviation 4 L S N p 7j6 AMA Ccffl Opcn ecord QU1XOt6 QUAt2 bQY4K aukoglro bj trade-2 sg5ds threoa twiiea aEoed bi fiob Mti*rshi onJda farm 11 Weiqhks Air/rome Rubber Total Prop /5 /9p 4s Motor 24 bs 9 10 went thataway part Bobs discussion enjoyed bit about walking fast through house rotor tests hand glides living room goes See text coo vv I1ILu win run wi uvn uu iii daily light forthe one-flight Unlimited Mulvihill event US Free Flight Champs weighs 80 grams motor 80 grams rubber Toni White photo discovered hard way Successful flap ping-blade single-rotor giros have built seem require careful tuningmy experience hasnt happy Twin-rotor giros model man-carrying have built before twin-rotor model know reported Zaic Yearbook course used flapping blades reported tricky figured flapping blades twin would efficient rigid rotors would easier starters efficiency could come later model built sort middle-size convenience making changes Too small too large would have hassle built very light using outdoorstyle construction surfacesthe rotors included tissue-covered both sides doped fuselage indoor-style simply because appropriate unused balsa tube kicking around shop small wing half area allowed rules used support rotors simply because conventional wing construction rather efficient sort structure few fast walks through house assembled model convinced rotors doing what supposed rather well Glide tests living room got CG position incidence angles about right Yep giros glide surprisingly flat Limited flight testing indicates model docile forgiving model Ive ever built Stalls conventional sense dont happen model comes dead stop either under power glide simply drops its nose bit keeps going Lateral stability absoluteim mediate recovery no overshoot oscil lations Best flight far 122 about half what would expect equivalent conventional model under similar conditions Autogiros arent noted efficiency 122 flight time isnt great isnt too bad starters French Half-A Free Flight French style apparently like Free Flight American style course strong Big Three FAL events Coupe -a ROlnrl Cut 205-4 V 00 5stS 0101 GOtiES fl2AtbC14tS f-A tizench stjte IF Dmeosors n nflnnvers1 l 01muo4O1130101&/45I-00c noted 01111Pottero or-oW Oroit 5pars Z2 iorowood S0 Spars 3ku-dooood tubeS 2 02000Cr-S dHiver originated well curiously enough pop French magazines feature Peanut Scale ular competition event Gas has other rubber-power scale models Continued page 112 July1979 41 George Matherats 1/2 gas model unusual respects winingest 1/2 France Among Its numerous design twists thread turbulator Photo Jean Frugoli Jim Clem fuels prototype Country Boy 1/2 Underslung fin later moved aft stab accordance current fashions Kruse plc Joe Bilgri one-time Indoor champ came out retirement new models try outforthe 1980 World Champs team Joe also building Wakefield Bob Meuser photograph Quiet Power -Tatone Makes Easy new super quiet K&B 40 R/C muffler requires no exhaust plugs fittings adaptors Muffler machined fit exhaust stack cover exposed holes Just bolt on.thats Will reduce noise 10 12 decibels little no loss rpms Noise cancelled interposing sound waves eRadi cal free flow expansion chamber angled blow exhaust away fuselage attach provision pressure fitting Also available ENVA 29 35 40 45 OS MAX 30 35 40 SUPER TIGRE G21 35 46 Add $100 extra above engines specify type pie four different weights placed long board would push down different amount different place total forces downward could considered single force pushing down whatever point along board would necessary give ex actly same effect four differ ent weights resultant point called Center Gravity Therefore change weight location board will shift bal ance point original CU loca tion model nose-heavy balance point further forward rela tion designed Center Gravity Note 2 Baughmans Aviation Diction ary defines Decalage difference angles incidence wings bi plane multiplane measured acute angle between chords plane parallel plane symmetry Rightly wrongly modelers cluding author have expanded term include monoplanes refer ring difference angles inci dence wing stabilizer FF Indoor/Tenny continued page 39 311 Poinciana Dr Birmingham AL 35209 newsletter fairly new very regular usually very informative Bills labor love benefits Alabama FFFlyers group club usual sense Wood Cutting May 79 column carried comments balsa cutting some hints achieving accuracy strength seldom appreciated just what wonders achieved some better craftsmen build Indoor models Stan Chilton Wichita KS craftsmen recent Easy B models have turning times high 16 minutes Cat II sites ceiling heights between 35 100 Photo 2 shows some amazing balsa work Easy Bsand explains model well under 04-oz weight picture shows underside wing visibly tiny rib cross-sections Note main rib uses second balsa piece across bottom help hold curva ture diagonal rib pattern used stiffen wing ribs less 02 maximum dimension appear formidible cutting task Its Easyalmost Actually takes produce such part very sharp knife steady practiced hand very carefully selected wood Wood selection itself topic worthy several columns major ingredient separating top builders competition part must just strong enough carry its share load no excess balloon weight Much time spent choosing just right piece wood part needed actually build part Maxim Indoor models arent hard build just different paragraph above illustrates very well No other type model has applications different techniques Indoor models yet few basic techniques beyond skill model builders two other problems rear ugly headsa precon ceived notion what capable doingI could neverdothat becomes classic self-fulfilling prophesy lack information about some tasks accomplished experienced builder Hopefully what column about sharing various techniques aren t obvious thus encouraging interested persons try hand part model building inexpensive still challenging enough almost anyone Attention Details has noted occasionally small details make break Indoor modelers efforts Nowhere true model trim contest flying tiny shift location models CG center-of gravity wing incidence will rob seconds minutes models performance Changes humidity atmospheric pressure air temperature play part No except computer can remember details enough clarity duplicate previous successful flights make good guess about set up model fly contest inadequate time available make exhaustive test flights Dennis Jaecks really top Pennyplane fliers yet business prevents him doing much testing would comfortable keep track remember Dennis has won Pennyplane once Nats often has held records event Fig 2 shows portion several forms Dennis uses keep track important model details credits such record-keeping much success Note particular builds models interchangable parts soModelParts isaveryimportantdetail permits substitution another part minimize field repair time simply because certain combinations parts work better others Conditions heading often expanded some fliers include relative humidity atmospheric pressure Bud Tenny PO Box 545 Richardson TX 75080 FF Duration/Meuser continued page 41 slow catch labeled new classification recent magazine Frances current big name Georges Matherat curiously enough best known internationally Coupe dHiver modeler curiously enough didnt become big-time flier copying American-style machines rather went own way strange route took sure interesting fuselage model built up around fiberglass boom bones forward section consist vertical crutch mounting engine tank two timers boom imbeded aft end crutch pylon forward-fin whatever choose call makes no concessions mere esthetics Ordinary solid American-style pylons weigh have right often first thing go mild crash regarding its size doubt Americanstyle FF Gas model has suffered too much lateral area up front stab aspect-ratio mere 26 about mere can get doubt winner higher AR gives greater change stab lift given change angle-of-attack So small highAR stab can effective large lowAR model sports timer-actuated autorudder new twist trick mech anism starts DT timer Graupner engine auto-rudder timer actuates making 100% foolproof avoiding possibility launch auto-rudder glide position model built like traditional chiotte de brique employs copious quantities hardwood take pine spruce Plywood used sub-rudder core pylon All-up weight over 8 oz wing area 243 square inches measured flat Cox 112 Model Aviation 1295 Hydraulic unit converts air driven retracts hydraulic operation Adjustable give realistic re tract speeds s gear sag out landing collapse required fortwo wheel ships two three wheel types Complete instructions included $8 POSTPAID IN us Qualified Dealer Inquiries Invited OR TIlE 72DRALOCK Li SLpsTIcK MOUNTING CLIP AN0 TW0 PLOW CONTROLS ox 7399 rk Oslaware 197ff Tee Dee 051 French rules sensibly include OSis turns 25000 RPM 5inch Kavan prop heaven knows what pitch French fly 7-sec engine runs 2-mi maxes would seem would have find rather large downer order max Georges has recently added thread turbulator about -inch behind leading edge has added MRA Cup list wins model thank Georges fine original three-view drawing presented additional information Jean Frugoli Gill iaume Warner le Compte de Pisafia Rebuttle Im glad see someone paying attention tallied up cost getting Wakefield competition some $648 January issue think thats high should see bill FAI Power dont forget throw motorcycle Writing Turbulator Bob Klipp points out around four bucks youve got makings two outdoor hand-launch gliders whole spect rum competition free flight classes HL Glider undoubtedly has offer terms reward-per-buck aero modeling sport going received following note French-speaking scale modeler translate word word ensure absolute accuracy subject Pirelli $30 per book may supply dozed Peanuts account 300 years yery dear no Well ordinarily wouldnt take seriously anything said someone talks goofy point can buy enough materials build dozen Peanut-Scale models year 300 years price pound Pirelli bit exaggerated has lot truth competition events can pursued competitively very small cash outlay Peanut Scale Pennyplane Easy B P-30 Embryo Endurance throw cost winder two-year supply rubber doesnt add up whole lot Step over Towline glider events almost push HL Glider second place A/l event no means limited kiddies circle-tow zoom launches havent caught really dont have lay out $15 trick towhooks few A/i kits market todays high costs difficult see could spend $10 sticks set plans An FAI Model Supply winch plus towline will run bit over $10 Use fuse dethermalizer save close $15 Join big kids go A/2 route youll need trick towhook clockwork timer Hutchinsons Dragmaster kits will set back whoppin 30 bucks cant possibly build crash lose about A/2 Nordic year isnt unusual see five-year-old model top place AMA Gas popular really rich-mans sport Half dozen engines $60 throw $30 per airplane set timers $100 worth kits starters batteries electric starter el. Cox Tee Dee 049 plus kit plus timer bit fuel things need will get business about $60 too much adult perhaps represents lot lawn mowing youngster indeed able find such work hope AMA Gas mentioned all-foam construction April issue certainly inexpensive yet doesnt seem like thing beginning free fightertime will tell proposal low-cost beginners event designated FF-80-27 authored Dave Benepe might have helped matters got clobbered FF Contest Board Initial Vote negative vote mere one-third members condemns proposal no further consideration whatsoever no possibility modification via Cross Proposal Interim Vote procedure no possibility reaching Final Ballot could still killed one-third majority negative vote next round will make 1982 before could possibly get rulebook provisional supplemental event Benepes proposed event aimed encourage beginners age try AMA Gas free flight event would limited stock reed-valve engines Expensive clockwork timersselling now half agaln price reed-valve engineare pro hibited fuel limiting engine timing required destroys incentive anyone developing really inexpensive clockwork timer thats another story person entering event would permitted enter another Power event specific contest Kits specifically geared such event simply available nor magazine plans course plenty other kits market refined expensive model would have event idea far dead Dave isnt off corner somewhere sulking has contact some Contest Board members find out clob bered proposal getting suggestions changes might corporated future proposal considerable interest event several clubs will running unofficial event Free flight isnt dead long shot number participants stable still free flight know warrants mention Endangered Species list discour aging thing average age free fighters increasing rate almost year per year cant lead much Little new blood being pumped system free fightera Contest Board member thattold would no great concern him free flight did die 10 15 years suspect hold point view didnt wed see action aimed turning tide mere wringing hands agony wont hack encouraging see guys like Dave Benepe trying something about Too bad arent him Book Review World Free Flight Review Vol 1975-1977 edited Bill Hartill World Free Flight Press 7513 Sausalito Ave Canoga Park CA 91307 $30 plus postage doubt titanic 100-percent-free-flight publication effort ever undertaken statistics alone mind-boggling 416 pages 8 X 11 52 color photos 622 black-and-whites 109 full-page drawings emphasis outdoor World July1979 113 HURl LOCKS dealer order direct Development Inc SAVE $150 ON YOUR NEXT RADIO Buy Digital Commander Flite Pack Kit Save Money out Compromising Quality Performance Three Servo Options Two Receiver Options Kit Prices Start $7496 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct Orders 816 584-7121 AU /3 Urn] BOX 511E HIGGINSVILLE MO 64037 Custom-Dilt-RIC Built Order Plans Kit stock choose Piper Tn-Pacer Quarter-Scale 89 wIng span 42 Sq Ft detail ed plans $1699 PP Send $100 * Curtiss Hawk stomped envelope detailed listPm6~uE 60 wingspan 46 Sq Ft Built-Up RC Models 50% Sale super detailed scale plans Hobby Capitol Dist$1295 46 N Oak St ura Ca 93001 e 805 643-7616 ] Champs models flown sort competition considerable material Indoor World Champs Coupe dHiver smattering Old-Timer modeling Free Flight US style exemplified US Free Flight Champs sections about developments techniques associated model class written some knowledgable fliers business blow-by-blow accounts of major international World Champ competitions period covered complete listings results full-page plans occupy about half book accompanied story about history development model modelers own words About 90% plans have appeared publi cations available US FAT fliers Scatter Free Flight News NFFS Dig est Indoor News Views forth nice having under cover Most color photos truly excellent could have perfectly happy postcard shots lArc de Triumph le Tour Eiffel some family-album type snapshots Never theless whole photos document spirit international free flight compe titionits triumphs tragedies glories defeats pure fun itin addition its technology book red-blooded American FAT-oriented free flighter would proud own AnnouncemenL Fresno Annual September 29-30 weekend will see fortieth consecutive annual contest put Fresno Gas Model Airplane Club Events will include three FAT events l/2A B C D Gas Coupe P-30 Mulvihill A- 1 Glider Hand Launch Glider perhaps few others Stockton clubs Old-tinier Meet will held simul taneously same site Last years annual drew 155 contestants $2200 worth prizes including en graved silver-plate bowls sweep stakes winners years meet promises bigger better respect site sheep-grazing land 1 X 1 miles criss-crossed paved roads quartermile intervals Motorcycles OK Con tact man Russ James 4840 E Leisure Fresno CA 93727 Call 209 2552422 anytime Also something new Fresno club will series Tndoor meets first will June 23 Check Russ details Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about Model Aviation Combat Trends/Rush continued page 53 Gary James Steve Sacco have modi fied NACA formula change such things LE radius TE angle best airfoil use depends also wing surface bumpiness Surface imperfec tions near LE really degrade Neme sis IT airfoils performance foamies get away bumpy surfaces using really blunt LEs Tm using Gary James-modified NACA airfoil fat LE foamy works great New airfoil design techniques have developed last few years may make airfoil design scientific spoil fun techniques consist determin ing what pressure distribution want calculating shape gives FX Wortmann University Stuttgart has designed some new fangled airfoils full-scale sailplane tail surfaces operate same Reynolds numbers design conditions Combat models wind tunnel data show im provement over old NACA airfoils Combat fliers have shown little interest trying new sectionsprobably because look different have pretty sharp LEs concave near TE Want first kid block try StuttgarterProfilkatalog D Althaus published Institute fur Aero-u Gasdynamik University Stuttgart Germany 1972 Configuration Airplanes bigger now several reasons Combat planes must turn tight fast loops minimum loop diameter airplane can turn proportional its wing area loadingif other factors dont change Area loading ratio weight wing area speed airplane can maintain consecutive maneuvers depends its duced drag given loop size speed induced drag proportional square span loading Span loading ratio weight wingspan Foamies need lots wing area span make up foams weight dis advantage Because engine fuel line weight constant get lower area loading span loading going bigger longer wing AMA-class foamies typically have 42 48 spans 360 400 sq areas compared 39 spans 320 360 sq areas conven tional planes Conventional-construction airplanes have practical wing span limits Balsa comes 36 lengths span means buying more-expensive 48 wood Itis also harder keep warps out longer wings Sherwood Buckstaff Texan col leagues kept 36 span increased chord l0an inch standard planes timeand gained area loading advantage over us paid area increased drag 114 Model Aviation
Edition: Model Aviation - 1979/07
Page Numbers: 40, 41, 112, 113, 114
BOB WHITE Does Again Bob won Wakefield event held first day two-day California Eagles Annual Taft March Bobs winning yet another Wakefield contest ho hum scarcely news big-news event happened following day Mulvihill event started 715 Bob got three 5-mm maxes over early decided take crack 10year-old record set George Batiuck 68 mm 54 secor 11 progressively increasing max flights last being 11 -mm flight plus 12th flight 2 mm 54 sec Weather hazy partly cloudy very little drift Bob wasnt quite prepared having brought five motors well worn ones tying broken strands became hassle Well Bob just went flight after flight maxed tenth 12-minute flight passing old record followed flight 10 mm 24 sec new record 88 mm 24 sec tell White lad comer Record Autogiro off-beat competition classes seem have affinity other somehow Ive hank ering get back autogiro record held late thirties exceptions Autogiro records have set models would have flown better rotor left home rules allow fixed wing having area almost equal rotor area trend has simply add rotor conventional model design * 22% m /24 p79 -Wi4 I rotor interfere normal flight model little possible Ive seen least rotor couldnt decide way turn convinced no necessity that true miniature autogiro could fly perfectly well blades single-rotor giro must allowed flap freely up down aircraft remain upright long Juan de la Cierva inventor giro 40 Model Aviation 4 L S N p 7j6 AMA Ccffl Opcn ecord QU1XOt6 QUAt2 bQY4K aukoglro bj trade-2 sg5ds threoa twiiea aEoed bi fiob Mti*rshi onJda farm 11 Weiqhks Air/rome Rubber Total Prop /5 /9p 4s Motor 24 bs 9 10 went thataway part Bobs discussion enjoyed bit about walking fast through house rotor tests hand glides living room goes See text coo vv I1ILu win run wi uvn uu iii daily light forthe one-flight Unlimited Mulvihill event US Free Flight Champs weighs 80 grams motor 80 grams rubber Toni White photo discovered hard way Successful flap ping-blade single-rotor giros have built seem require careful tuningmy experience hasnt happy Twin-rotor giros model man-carrying have built before twin-rotor model know reported Zaic Yearbook course used flapping blades reported tricky figured flapping blades twin would efficient rigid rotors would easier starters efficiency could come later model built sort middle-size convenience making changes Too small too large would have hassle built very light using outdoorstyle construction surfacesthe rotors included tissue-covered both sides doped fuselage indoor-style simply because appropriate unused balsa tube kicking around shop small wing half area allowed rules used support rotors simply because conventional wing construction rather efficient sort structure few fast walks through house assembled model convinced rotors doing what supposed rather well Glide tests living room got CG position incidence angles about right Yep giros glide surprisingly flat Limited flight testing indicates model docile forgiving model Ive ever built Stalls conventional sense dont happen model comes dead stop either under power glide simply drops its nose bit keeps going Lateral stability absoluteim mediate recovery no overshoot oscil lations Best flight far 122 about half what would expect equivalent conventional model under similar conditions Autogiros arent noted efficiency 122 flight time isnt great isnt too bad starters French Half-A Free Flight French style apparently like Free Flight American style course strong Big Three FAL events Coupe -a ROlnrl Cut 205-4 V 00 5stS 0101 GOtiES fl2AtbC14tS f-A tizench stjte IF Dmeosors n nflnnvers1 l 01muo4O1130101&/45I-00c noted 01111Pottero or-oW Oroit 5pars Z2 iorowood S0 Spars 3ku-dooood tubeS 2 02000Cr-S dHiver originated well curiously enough pop French magazines feature Peanut Scale ular competition event Gas has other rubber-power scale models Continued page 112 July1979 41 George Matherats 1/2 gas model unusual respects winingest 1/2 France Among Its numerous design twists thread turbulator Photo Jean Frugoli Jim Clem fuels prototype Country Boy 1/2 Underslung fin later moved aft stab accordance current fashions Kruse plc Joe Bilgri one-time Indoor champ came out retirement new models try outforthe 1980 World Champs team Joe also building Wakefield Bob Meuser photograph Quiet Power -Tatone Makes Easy new super quiet K&B 40 R/C muffler requires no exhaust plugs fittings adaptors Muffler machined fit exhaust stack cover exposed holes Just bolt on.thats Will reduce noise 10 12 decibels little no loss rpms Noise cancelled interposing sound waves eRadi cal free flow expansion chamber angled blow exhaust away fuselage attach provision pressure fitting Also available ENVA 29 35 40 45 OS MAX 30 35 40 SUPER TIGRE G21 35 46 Add $100 extra above engines specify type pie four different weights placed long board would push down different amount different place total forces downward could considered single force pushing down whatever point along board would necessary give ex actly same effect four differ ent weights resultant point called Center Gravity Therefore change weight location board will shift bal ance point original CU loca tion model nose-heavy balance point further forward rela tion designed Center Gravity Note 2 Baughmans Aviation Diction ary defines Decalage difference angles incidence wings bi plane multiplane measured acute angle between chords plane parallel plane symmetry Rightly wrongly modelers cluding author have expanded term include monoplanes refer ring difference angles inci dence wing stabilizer FF Indoor/Tenny continued page 39 311 Poinciana Dr Birmingham AL 35209 newsletter fairly new very regular usually very informative Bills labor love benefits Alabama FFFlyers group club usual sense Wood Cutting May 79 column carried comments balsa cutting some hints achieving accuracy strength seldom appreciated just what wonders achieved some better craftsmen build Indoor models Stan Chilton Wichita KS craftsmen recent Easy B models have turning times high 16 minutes Cat II sites ceiling heights between 35 100 Photo 2 shows some amazing balsa work Easy Bsand explains model well under 04-oz weight picture shows underside wing visibly tiny rib cross-sections Note main rib uses second balsa piece across bottom help hold curva ture diagonal rib pattern used stiffen wing ribs less 02 maximum dimension appear formidible cutting task Its Easyalmost Actually takes produce such part very sharp knife steady practiced hand very carefully selected wood Wood selection itself topic worthy several columns major ingredient separating top builders competition part must just strong enough carry its share load no excess balloon weight Much time spent choosing just right piece wood part needed actually build part Maxim Indoor models arent hard build just different paragraph above illustrates very well No other type model has applications different techniques Indoor models yet few basic techniques beyond skill model builders two other problems rear ugly headsa precon ceived notion what capable doingI could neverdothat becomes classic self-fulfilling prophesy lack information about some tasks accomplished experienced builder Hopefully what column about sharing various techniques aren t obvious thus encouraging interested persons try hand part model building inexpensive still challenging enough almost anyone Attention Details has noted occasionally small details make break Indoor modelers efforts Nowhere true model trim contest flying tiny shift location models CG center-of gravity wing incidence will rob seconds minutes models performance Changes humidity atmospheric pressure air temperature play part No except computer can remember details enough clarity duplicate previous successful flights make good guess about set up model fly contest inadequate time available make exhaustive test flights Dennis Jaecks really top Pennyplane fliers yet business prevents him doing much testing would comfortable keep track remember Dennis has won Pennyplane once Nats often has held records event Fig 2 shows portion several forms Dennis uses keep track important model details credits such record-keeping much success Note particular builds models interchangable parts soModelParts isaveryimportantdetail permits substitution another part minimize field repair time simply because certain combinations parts work better others Conditions heading often expanded some fliers include relative humidity atmospheric pressure Bud Tenny PO Box 545 Richardson TX 75080 FF Duration/Meuser continued page 41 slow catch labeled new classification recent magazine Frances current big name Georges Matherat curiously enough best known internationally Coupe dHiver modeler curiously enough didnt become big-time flier copying American-style machines rather went own way strange route took sure interesting fuselage model built up around fiberglass boom bones forward section consist vertical crutch mounting engine tank two timers boom imbeded aft end crutch pylon forward-fin whatever choose call makes no concessions mere esthetics Ordinary solid American-style pylons weigh have right often first thing go mild crash regarding its size doubt Americanstyle FF Gas model has suffered too much lateral area up front stab aspect-ratio mere 26 about mere can get doubt winner higher AR gives greater change stab lift given change angle-of-attack So small highAR stab can effective large lowAR model sports timer-actuated autorudder new twist trick mech anism starts DT timer Graupner engine auto-rudder timer actuates making 100% foolproof avoiding possibility launch auto-rudder glide position model built like traditional chiotte de brique employs copious quantities hardwood take pine spruce Plywood used sub-rudder core pylon All-up weight over 8 oz wing area 243 square inches measured flat Cox 112 Model Aviation 1295 Hydraulic unit converts air driven retracts hydraulic operation Adjustable give realistic re tract speeds s gear sag out landing collapse required fortwo wheel ships two three wheel types Complete instructions included $8 POSTPAID IN us Qualified Dealer Inquiries Invited OR TIlE 72DRALOCK Li SLpsTIcK MOUNTING CLIP AN0 TW0 PLOW CONTROLS ox 7399 rk Oslaware 197ff Tee Dee 051 French rules sensibly include OSis turns 25000 RPM 5inch Kavan prop heaven knows what pitch French fly 7-sec engine runs 2-mi maxes would seem would have find rather large downer order max Georges has recently added thread turbulator about -inch behind leading edge has added MRA Cup list wins model thank Georges fine original three-view drawing presented additional information Jean Frugoli Gill iaume Warner le Compte de Pisafia Rebuttle Im glad see someone paying attention tallied up cost getting Wakefield competition some $648 January issue think thats high should see bill FAI Power dont forget throw motorcycle Writing Turbulator Bob Klipp points out around four bucks youve got makings two outdoor hand-launch gliders whole spect rum competition free flight classes HL Glider undoubtedly has offer terms reward-per-buck aero modeling sport going received following note French-speaking scale modeler translate word word ensure absolute accuracy subject Pirelli $30 per book may supply dozed Peanuts account 300 years yery dear no Well ordinarily wouldnt take seriously anything said someone talks goofy point can buy enough materials build dozen Peanut-Scale models year 300 years price pound Pirelli bit exaggerated has lot truth competition events can pursued competitively very small cash outlay Peanut Scale Pennyplane Easy B P-30 Embryo Endurance throw cost winder two-year supply rubber doesnt add up whole lot Step over Towline glider events almost push HL Glider second place A/l event no means limited kiddies circle-tow zoom launches havent caught really dont have lay out $15 trick towhooks few A/i kits market todays high costs difficult see could spend $10 sticks set plans An FAI Model Supply winch plus towline will run bit over $10 Use fuse dethermalizer save close $15 Join big kids go A/2 route youll need trick towhook clockwork timer Hutchinsons Dragmaster kits will set back whoppin 30 bucks cant possibly build crash lose about A/2 Nordic year isnt unusual see five-year-old model top place AMA Gas popular really rich-mans sport Half dozen engines $60 throw $30 per airplane set timers $100 worth kits starters batteries electric starter el. Cox Tee Dee 049 plus kit plus timer bit fuel things need will get business about $60 too much adult perhaps represents lot lawn mowing youngster indeed able find such work hope AMA Gas mentioned all-foam construction April issue certainly inexpensive yet doesnt seem like thing beginning free fightertime will tell proposal low-cost beginners event designated FF-80-27 authored Dave Benepe might have helped matters got clobbered FF Contest Board Initial Vote negative vote mere one-third members condemns proposal no further consideration whatsoever no possibility modification via Cross Proposal Interim Vote procedure no possibility reaching Final Ballot could still killed one-third majority negative vote next round will make 1982 before could possibly get rulebook provisional supplemental event Benepes proposed event aimed encourage beginners age try AMA Gas free flight event would limited stock reed-valve engines Expensive clockwork timersselling now half agaln price reed-valve engineare pro hibited fuel limiting engine timing required destroys incentive anyone developing really inexpensive clockwork timer thats another story person entering event would permitted enter another Power event specific contest Kits specifically geared such event simply available nor magazine plans course plenty other kits market refined expensive model would have event idea far dead Dave isnt off corner somewhere sulking has contact some Contest Board members find out clob bered proposal getting suggestions changes might corporated future proposal considerable interest event several clubs will running unofficial event Free flight isnt dead long shot number participants stable still free flight know warrants mention Endangered Species list discour aging thing average age free fighters increasing rate almost year per year cant lead much Little new blood being pumped system free fightera Contest Board member thattold would no great concern him free flight did die 10 15 years suspect hold point view didnt wed see action aimed turning tide mere wringing hands agony wont hack encouraging see guys like Dave Benepe trying something about Too bad arent him Book Review World Free Flight Review Vol 1975-1977 edited Bill Hartill World Free Flight Press 7513 Sausalito Ave Canoga Park CA 91307 $30 plus postage doubt titanic 100-percent-free-flight publication effort ever undertaken statistics alone mind-boggling 416 pages 8 X 11 52 color photos 622 black-and-whites 109 full-page drawings emphasis outdoor World July1979 113 HURl LOCKS dealer order direct Development Inc SAVE $150 ON YOUR NEXT RADIO Buy Digital Commander Flite Pack Kit Save Money out Compromising Quality Performance Three Servo Options Two Receiver Options Kit Prices Start $7496 details send $1 latest catalog Add $50 1st Class return $1 hand ling direct Orders 816 584-7121 AU /3 Urn] BOX 511E HIGGINSVILLE MO 64037 Custom-Dilt-RIC Built Order Plans Kit stock choose Piper Tn-Pacer Quarter-Scale 89 wIng span 42 Sq Ft detail ed plans $1699 PP Send $100 * Curtiss Hawk stomped envelope detailed listPm6~uE 60 wingspan 46 Sq Ft Built-Up RC Models 50% Sale super detailed scale plans Hobby Capitol Dist$1295 46 N Oak St ura Ca 93001 e 805 643-7616 ] Champs models flown sort competition considerable material Indoor World Champs Coupe dHiver smattering Old-Timer modeling Free Flight US style exemplified US Free Flight Champs sections about developments techniques associated model class written some knowledgable fliers business blow-by-blow accounts of major international World Champ competitions period covered complete listings results full-page plans occupy about half book accompanied story about history development model modelers own words About 90% plans have appeared publi cations available US FAT fliers Scatter Free Flight News NFFS Dig est Indoor News Views forth nice having under cover Most color photos truly excellent could have perfectly happy postcard shots lArc de Triumph le Tour Eiffel some family-album type snapshots Never theless whole photos document spirit international free flight compe titionits triumphs tragedies glories defeats pure fun itin addition its technology book red-blooded American FAT-oriented free flighter would proud own AnnouncemenL Fresno Annual September 29-30 weekend will see fortieth consecutive annual contest put Fresno Gas Model Airplane Club Events will include three FAT events l/2A B C D Gas Coupe P-30 Mulvihill A- 1 Glider Hand Launch Glider perhaps few others Stockton clubs Old-tinier Meet will held simul taneously same site Last years annual drew 155 contestants $2200 worth prizes including en graved silver-plate bowls sweep stakes winners years meet promises bigger better respect site sheep-grazing land 1 X 1 miles criss-crossed paved roads quartermile intervals Motorcycles OK Con tact man Russ James 4840 E Leisure Fresno CA 93727 Call 209 2552422 anytime Also something new Fresno club will series Tndoor meets first will June 23 Check Russ details Bob Meuser 4200 Gregory St Oak land CA 94619 writing advertisers mention read about Model Aviation Combat Trends/Rush continued page 53 Gary James Steve Sacco have modi fied NACA formula change such things LE radius TE angle best airfoil use depends also wing surface bumpiness Surface imperfec tions near LE really degrade Neme sis IT airfoils performance foamies get away bumpy surfaces using really blunt LEs Tm using Gary James-modified NACA airfoil fat LE foamy works great New airfoil design techniques have developed last few years may make airfoil design scientific spoil fun techniques consist determin ing what pressure distribution want calculating shape gives FX Wortmann University Stuttgart has designed some new fangled airfoils full-scale sailplane tail surfaces operate same Reynolds numbers design conditions Combat models wind tunnel data show im provement over old NACA airfoils Combat fliers have shown little interest trying new sectionsprobably because look different have pretty sharp LEs concave near TE Want first kid block try StuttgarterProfilkatalog D Althaus published Institute fur Aero-u Gasdynamik University Stuttgart Germany 1972 Configuration Airplanes bigger now several reasons Combat planes must turn tight fast loops minimum loop diameter airplane can turn proportional its wing area loadingif other factors dont change Area loading ratio weight wing area speed airplane can maintain consecutive maneuvers depends its duced drag given loop size speed induced drag proportional square span loading Span loading ratio weight wingspan Foamies need lots wing area span make up foams weight dis advantage Because engine fuel line weight constant get lower area loading span loading going bigger longer wing AMA-class foamies typically have 42 48 spans 360 400 sq areas compared 39 spans 320 360 sq areas conven tional planes Conventional-construction airplanes have practical wing span limits Balsa comes 36 lengths span means buying more-expensive 48 wood Itis also harder keep warps out longer wings Sherwood Buckstaff Texan col leagues kept 36 span increased chord l0an inch standard planes timeand gained area loading advantage over us paid area increased drag 114 Model Aviation