Duralion El Bob Meuser 100 540 438 1675 30rt 0dn JZ55dz4P 00 V 8oA KL- ibd 22tL 473 Power i4 strands 475 long Fill 6eo rge Perryman s 1ZCAC SPeCkLED B11D Emile Gouverne France displays super-highAR solid wing Wakefield spans 111 appears have three polyhedral breaks counting center Photo Ron Moulton BEYOND BELIEFF Beyond Belief No matter spell it correct Dan Beliefls Indoor Category Hand Launch Glider record has topped margin 38% Stan Stoy did mite Stoy toy called Coot presented column De cember 1975 issue Indoor HLG flier gets total nine flights total duration best two counts Stoys 1088-second best score made during first four nine-flight record attempts four series bettered record handily wasnt fluke rather repeatable performance quarter century Category 35-ft max ceiling height record has inched up second time fel lows like Lee Hines Ron Wittman Dan Beliefis record 788 seconds has 52 Model Aviation S lVei9ht3 Winq fzis 5tab Prop /2ubber 112 OZ 96 28 93 329 4oo 729 George Perrymans Mulvihill Trophy winner Great Speckled Bird Theres no mistaking Perryman bird people stopped poking fun George generation agohe has such remark able record odd-looking rubber models Both Perryman photographs taken Bob Meuser o4o /4 / 5-1 / K2z -I * -y 5 / / /2 arc S Cover boitom tbken I0 1z 2 / f 2ubber a66 tO 090 23 IV dournthrus r Winq 4 wash /efi dihedral joint Stab left tifi Cezar Patks 4flat -Y 2 1/ M1/crclzZe 3 05 2fLat 205 64 7i7 /4 j05 c / 10 16 74 Wiu9 Prov A//else Total 03/az 88q 023 65 058 765 /td 3/ Caterorq I/if Oien /Vationa/ I2ecord fliS aDOUT ciose rerryman prop gets being conventionalmight useful selfdefense Look closely blade tips books since 1969 quantum jump performance achieved flights made gym Texas Christian University air-conditioning system running air ex tremely turbulent Normally turbulence spells death low-ceiling indoor flight Stoys model trimmed take ad vantage turbulence CG well forward about 25% root chord making extremely stable model would respond rapidly changing wind direction model tended zip through downdrafts slow down updrafts spending time ups downs several occasions actually gained altitude about three feet crackduring its longer flights lasted over minute air vents near ceiling equal number inlets outlets no net vertical air flow model flying vertical wind tunnel Continued page 93 December1977 53 020 tO 025 i2d22/7 49 35 Form 1-qa/jug 770 J2014CE pEt2rgpLAt2urn 34s July 37911 Smoking may great health tobacco smoke helps cure warps microfilmcovered surfaces Cezar Banks demonstrates record Novice Pennyplane has several design innovations warrant serious attention 5MUF- L- IT SERIES NEW PRODUCTS /A PISTON SETTING TOOL MUST FOR 4693 25EVERY _CLUB PA MUFFLER/8111 CAR MUFFLER K B 21 QT 15500 Mufflers 149for II E3I0 PIPECALUMET SERIES DIQIZOO SCALE INSTRUMENT KITS 2/45/26 IMERS 7/26 1/2FUEL CUT OFF 1150 ALL SIZES 279DETHERMALIZER 1150 THE WORLDS LARGEST LINE OF MUFFLERS AND ENGINE electric pump Ear Protectors must wear ear pro tectors Whether muff plug type Per manent hearing loss will result use Engine The intend run Props As recommended manufacturer Plugs A good idea have two brands same type recommended manu facturer Tools Enough tighten engine mount change prop plug plus correct tools dismantle engine Fuel As recommended manufacturer Battery To fire glow plug Lots clean rags wipe clean Notebook keep records engine per formance Optional Equipment Tachometer Mechanical optical Stopwatch time duration runs using small volume tank Electric Starter use bushing engines Examine flying equipment put together special test stand set up de scribed above next column will de scribe prepare new engine test running following column will take out run engine develop some really important skills Don Jehilk 438A Schweer Dr Star Route Hawthorne NV 89415 FF Duration/Meuser continued page 53 About Rules Rules never foolproof always loopholes simply because no rules-makers crystal ball good So what loophole found changes character event originally intended change rules Sometimes dozens examples few come mind original rules Indoor Paper Stick inadvertently per mitted use microfilm covered prop got fixed Drop gliderssmall micro film-covered gliders held over head dropped thermal rising section floor heated sun lightwere ruled out Indoor HL Glider events Vertical takeoff hydro models eliminated rules change such changes often best interests sport whole someone suffers National records made under old rules go down crack does development models fit loopholes old rules have made several ruleschange proposals currently being weighed FF Contest Board will cause some suffering passed CB members will have decide whether suffering few compensated benefit decisions Im sure will come easily So already have heard proposal re-rig rules such way dynamic soaring sort utilized Stan Stoys Indoor HL Glider record breaker will legal such change rules would wipe Stoys record books render impotent development skills utilize dynamic soaring advantage such changes would seem best interest sport Perhaps should mention pro posal re-rig rules prohibit dy namic soaring came Stan Stoy rules-change proposal once made cluded provision permanent national records established records dropped books result rules change publication list such permanent records few years sothat accomplishments would forgotten Contest Board rep resentatives threw out proposal hard bounced Well cant win em Outstanding Performances Outstanding record-breaking performances sure youll never see AMA National Records list Fifth Max-Men FAI Annual Bob White put up 14 consecutive maxes Wakefield event nosing out Bill Bogarts record two-day affair qualify national record flights must made same day Lee Hines did same Nordic glider event fourth anDecember 1977 93 nual Nineteen consecutive 5-minute maxes total score 98 mm 14 sec far astounding gas model perform ance since Max invented Bob Scully did big Supertigre 65powered Satellite 1188 Thunderbugs Annual doesnt qualify offi cial record because done night qualify flights must made tween sunrise sunset incidentally Satellites took top honors gas-power event Sometimes Hate Job especially hate have make hero out some upstart undermines founda tion fragile pillar glory beats own game keep telling myself winning isnt everything little feller inside headbone says Yes sure beats heck out losing So teary eye heavy heart hereby discharge duties imposed fate Editor tell Cezar J Banks copped Category III Novice Pennyplane record worst part did fair square golly wish cheated just little Actually record time didnt equal Bill Xenakis year-old Senior record fitting clob bered doubt however Banks time 1134 will beaten awhile least substantial margin Banks model isnt simply ordinary model well flown has some unique innovations Whether innovations significant improve ments anybodys guess surely didnt hurt anything innovation fairing behind leading-edge spar Certainly turbulence induced behind conventional spar can serve no useful purpose simple fair ing such Banks used must eliminate major part turbulence its sociated drag Fairing rear spar ever might mistake does purposely what happens indoor model trailing edge automatically called Blubaugh Gieskieng fenceor recently Gurney fenceand sorts good things attributed substitution stab-tip rudders conventional single rudder another novation least relation contempo rary indoor modeling Stab-tip rudders probably act tip plates increasing effective aspect ratio stabilizing influ ence stab significant knows Such arrangement might have practical advantages however under slung rudders have broken occasionally although breaks have easily fixed once didnt notice break price sloppy pre-flight inspection poor official flight like think though underslung rudder pro tects stab during landing Perhaps Banks arrangement sturdier overall Banks innovationsat least think innovation respect Novice Pennyplane modelingthat am dead certain step right direction extremely wide prop blades moderate pitch Now kiddies slump seats shut eyes am about theory half death result simple rather easily product review product review product review Mechanical Speed Reducer Serving same purpose electric power prop drivers gas engines device offers intriguing possibilities associated larger props driv en less motor rpm precisionmade reducer enables swinging larger prop thrust aerodynamic efficiency Scale-size props feasible High-quality tim ing belt precision timing pulleys insure long life almost silent operation Replace ment belts available separately $2995 Astro Flight Inc 1337 Beach Ave Venice CA 90291 product review product review product review defended theory maximum flight duration rubber weight should twice weight model rubber quite few conditions assumptions met however theory applicable structural weight independent rub ber weight assumption certain ly valid conventional Pennyplanes cause 31-gram minimum weight rule Another assumption prop efficiency independent rubber weight think theory practice might diverge because anything wrong theory cause conditions underlying vi olated increase rubber weight first lets say increase width rubber model climbs gusto deadsticks mile floor flight du ration suffers So increase length rubberthereby also increasing its weightuntil model lands just enough turns left keep slack out motor Although prop rpm has increased because greater rub ber cross section greater gross weight model turns wound motor have increased greater factor because increased motor length duration flight has increased havent already exceeded motor-weight-equals-twice-the-structuralweight rule conditions theory havent violated best knowledge nobody has ever approached theoretical optimum degree success best rubber weight about equals structural weight weight-rule-limited models After unsuccessful attempt up performance Novice Pennyplane using 30-in loop A-in rub ber weighing 30% structural weight mentioned results Clarence Mather replied something effect increasing rubber weight doesnt always increase flight performance rubber length tuned model neither lands too turns left nor dead-sticks countered excuse based fact such long 94 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-RAY dealers sold themSHALL WE SAY MORE Audreses Aicratt Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 C Support AMA Price $3995 kit per dollar bar em motor33 times hook spacingknots up easily Clarence made clear remark applied absence effect Well Clarence given squandering words reckless abandon did bit head-scratchin over Clar ences remark relation several rather unsuccessful attempts increase duration increasing rubber weight ol baldy about lay Novice Pennyplanes have prop-diam eter limitation 12-in order get such relatively small prop absorb lots power thereby requiring lots rubber tempting increase pitch Thats great up point easy get point blades arent up job stall power input has increased increase pitch power output prop has creased proportion fact might have decreased following pearls wisdom follow seem substantiated recent experiences High pitch OK long coupled large blade width pushing rubber-weight-syn drome beyond reason might lead success might better off short skinny motor above remarks apply high-ceiling flying might indeed probably apply low-ceiling fly ing prop efficiency during initial power burst probably important model going get up ceiling anyhow doesnt climb hot simply will required bang its head against ceiling shorter time What counts low-ceiling flying rafter-banging name game prop efficiency during cruise de scent game might well skinny high-pitch props optimum Meanwhile Banks formula2-in wide blades pitch 22 inseems pretty close optimum conditions Whew Incidentally dont let Banks fellow out sight has recently re turned modeling after absence quarter century spies tell has seen company Clarence Mather maybe some good stuff coming off him whats worse seems have few ideas own event bears watching Tenth Annual NFFS Sympo whompin 152 pages long 1977 edition signals tenth anniversary unique publica tion Included large section covering ten Models Year fine three-view drawing model Bruce Elwanda Hannah photos descrip tions models development Model types include indoor outdoor rubber gas power towline gliders bulk report devoted tech nical papers range ex tremely theoretical down-home practical Included papers towline glider design performance analysis rubber-power gas-power props tricky airfoils wing wing-tip shapes warpand flutter-resistant structures rubberpower gas model performance analy sis about finding thermals prices please fasten seat belts members both NFFS AMA residing USA non-residents $800 others $900 Mailing charges Fourth class US Canada Mexico 75airmail Canada Mexico $225 Europe $335 Far East $465 Special deals available bulk orders Order Jack Brown 20267 Northbrook Sq Cu pertino CA 92067 price may seem high actually less per page recent years Great Speckled Bird can say what like about aesthetics George Perrymans models highly unlikely timer would confuse Georges mod els someone elses Great Speck led Bird no exception GSB took first place unofficial Unlimited event 1976 Nats event consisted single flight no max just after dawn close can get test models performance aid thermals 1977 Nats Georges GSB helped him qualify Mulvihill Tro phyawarded highest time Un limited Rubber event regardless age contestantwhich George has tried desperately win years drawing shows Georges inDecember 1977 95 ventions one-and-one-half-blade prop George calls little feller mini-blade theory evens out hole lift distribution left main blade something like main blade incidentally built-up tissuecovered construction prop used win 1976 Unlimited Unlimited event now resides display rotunda Meuser Memorial Library Museum prop used win Mulvihill George least conventional cant say sure whether little hooks ends blades help much sure cant hurt Scale Nuts Only National Air Space Museum has published volume called Aircraft National Air Space Museum comprehensive catalog Museums extensive aero nautical collection includes historical information three-view drawings planes display Museum lists locations remaining aircraft 225 black-and-white photos 128-page soft-cover book 12 color photos covers price $275 postpaid Checks money orders should made payable Smith sonian Institution dont send cash Order National Air Space Museum Publications Smithsonian Institution Washington DC 20560 Bob Meuser 4200 Gregory Si. Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control79 Andrews Aircraft Model Co94 Coverite3 Cox Hobbies Inc31 Davis Diesel Development88 Du-Bro Products91 EK-Logictrol5 Flyline Models88 Fox Mfg Company5 Carl Goldberg Models Inside Front Cover Grish Brothers80 Hobbypoxy85 K&BMfg81 Midwest Products Company4 Morrison Repla-Tech90 Pactra Industries89 Peck-Polymers92 Proctor Ent Corp88 Progress Mfg Company54 R/C Buyers Guide95 Rocket City Specialties90 Sig Mfg Company1 SC Modeler86 Sterling Models Inc82 Sullivan Products83 Tatone Products Inc93 Westport International87 Williams Brothers90 World EnginesBack Cover 96 Model Aviation
Edition: Model Aviation - 1977/12
Page Numbers: 52, 53, 93, 94, 95, 96
Duralion El Bob Meuser 100 540 438 1675 30rt 0dn JZ55dz4P 00 V 8oA KL- ibd 22tL 473 Power i4 strands 475 long Fill 6eo rge Perryman s 1ZCAC SPeCkLED B11D Emile Gouverne France displays super-highAR solid wing Wakefield spans 111 appears have three polyhedral breaks counting center Photo Ron Moulton BEYOND BELIEFF Beyond Belief No matter spell it correct Dan Beliefls Indoor Category Hand Launch Glider record has topped margin 38% Stan Stoy did mite Stoy toy called Coot presented column De cember 1975 issue Indoor HLG flier gets total nine flights total duration best two counts Stoys 1088-second best score made during first four nine-flight record attempts four series bettered record handily wasnt fluke rather repeatable performance quarter century Category 35-ft max ceiling height record has inched up second time fel lows like Lee Hines Ron Wittman Dan Beliefis record 788 seconds has 52 Model Aviation S lVei9ht3 Winq fzis 5tab Prop /2ubber 112 OZ 96 28 93 329 4oo 729 George Perrymans Mulvihill Trophy winner Great Speckled Bird Theres no mistaking Perryman bird people stopped poking fun George generation agohe has such remark able record odd-looking rubber models Both Perryman photographs taken Bob Meuser o4o /4 / 5-1 / K2z -I * -y 5 / / /2 arc S Cover boitom tbken I0 1z 2 / f 2ubber a66 tO 090 23 IV dournthrus r Winq 4 wash /efi dihedral joint Stab left tifi Cezar Patks 4flat -Y 2 1/ M1/crclzZe 3 05 2fLat 205 64 7i7 /4 j05 c / 10 16 74 Wiu9 Prov A//else Total 03/az 88q 023 65 058 765 /td 3/ Caterorq I/if Oien /Vationa/ I2ecord fliS aDOUT ciose rerryman prop gets being conventionalmight useful selfdefense Look closely blade tips books since 1969 quantum jump performance achieved flights made gym Texas Christian University air-conditioning system running air ex tremely turbulent Normally turbulence spells death low-ceiling indoor flight Stoys model trimmed take ad vantage turbulence CG well forward about 25% root chord making extremely stable model would respond rapidly changing wind direction model tended zip through downdrafts slow down updrafts spending time ups downs several occasions actually gained altitude about three feet crackduring its longer flights lasted over minute air vents near ceiling equal number inlets outlets no net vertical air flow model flying vertical wind tunnel Continued page 93 December1977 53 020 tO 025 i2d22/7 49 35 Form 1-qa/jug 770 J2014CE pEt2rgpLAt2urn 34s July 37911 Smoking may great health tobacco smoke helps cure warps microfilmcovered surfaces Cezar Banks demonstrates record Novice Pennyplane has several design innovations warrant serious attention 5MUF- L- IT SERIES NEW PRODUCTS /A PISTON SETTING TOOL MUST FOR 4693 25EVERY _CLUB PA MUFFLER/8111 CAR MUFFLER K B 21 QT 15500 Mufflers 149for II E3I0 PIPECALUMET SERIES DIQIZOO SCALE INSTRUMENT KITS 2/45/26 IMERS 7/26 1/2FUEL CUT OFF 1150 ALL SIZES 279DETHERMALIZER 1150 THE WORLDS LARGEST LINE OF MUFFLERS AND ENGINE electric pump Ear Protectors must wear ear pro tectors Whether muff plug type Per manent hearing loss will result use Engine The intend run Props As recommended manufacturer Plugs A good idea have two brands same type recommended manu facturer Tools Enough tighten engine mount change prop plug plus correct tools dismantle engine Fuel As recommended manufacturer Battery To fire glow plug Lots clean rags wipe clean Notebook keep records engine per formance Optional Equipment Tachometer Mechanical optical Stopwatch time duration runs using small volume tank Electric Starter use bushing engines Examine flying equipment put together special test stand set up de scribed above next column will de scribe prepare new engine test running following column will take out run engine develop some really important skills Don Jehilk 438A Schweer Dr Star Route Hawthorne NV 89415 FF Duration/Meuser continued page 53 About Rules Rules never foolproof always loopholes simply because no rules-makers crystal ball good So what loophole found changes character event originally intended change rules Sometimes dozens examples few come mind original rules Indoor Paper Stick inadvertently per mitted use microfilm covered prop got fixed Drop gliderssmall micro film-covered gliders held over head dropped thermal rising section floor heated sun lightwere ruled out Indoor HL Glider events Vertical takeoff hydro models eliminated rules change such changes often best interests sport whole someone suffers National records made under old rules go down crack does development models fit loopholes old rules have made several ruleschange proposals currently being weighed FF Contest Board will cause some suffering passed CB members will have decide whether suffering few compensated benefit decisions Im sure will come easily So already have heard proposal re-rig rules such way dynamic soaring sort utilized Stan Stoys Indoor HL Glider record breaker will legal such change rules would wipe Stoys record books render impotent development skills utilize dynamic soaring advantage such changes would seem best interest sport Perhaps should mention pro posal re-rig rules prohibit dy namic soaring came Stan Stoy rules-change proposal once made cluded provision permanent national records established records dropped books result rules change publication list such permanent records few years sothat accomplishments would forgotten Contest Board rep resentatives threw out proposal hard bounced Well cant win em Outstanding Performances Outstanding record-breaking performances sure youll never see AMA National Records list Fifth Max-Men FAI Annual Bob White put up 14 consecutive maxes Wakefield event nosing out Bill Bogarts record two-day affair qualify national record flights must made same day Lee Hines did same Nordic glider event fourth anDecember 1977 93 nual Nineteen consecutive 5-minute maxes total score 98 mm 14 sec far astounding gas model perform ance since Max invented Bob Scully did big Supertigre 65powered Satellite 1188 Thunderbugs Annual doesnt qualify offi cial record because done night qualify flights must made tween sunrise sunset incidentally Satellites took top honors gas-power event Sometimes Hate Job especially hate have make hero out some upstart undermines founda tion fragile pillar glory beats own game keep telling myself winning isnt everything little feller inside headbone says Yes sure beats heck out losing So teary eye heavy heart hereby discharge duties imposed fate Editor tell Cezar J Banks copped Category III Novice Pennyplane record worst part did fair square golly wish cheated just little Actually record time didnt equal Bill Xenakis year-old Senior record fitting clob bered doubt however Banks time 1134 will beaten awhile least substantial margin Banks model isnt simply ordinary model well flown has some unique innovations Whether innovations significant improve ments anybodys guess surely didnt hurt anything innovation fairing behind leading-edge spar Certainly turbulence induced behind conventional spar can serve no useful purpose simple fair ing such Banks used must eliminate major part turbulence its sociated drag Fairing rear spar ever might mistake does purposely what happens indoor model trailing edge automatically called Blubaugh Gieskieng fenceor recently Gurney fenceand sorts good things attributed substitution stab-tip rudders conventional single rudder another novation least relation contempo rary indoor modeling Stab-tip rudders probably act tip plates increasing effective aspect ratio stabilizing influ ence stab significant knows Such arrangement might have practical advantages however under slung rudders have broken occasionally although breaks have easily fixed once didnt notice break price sloppy pre-flight inspection poor official flight like think though underslung rudder pro tects stab during landing Perhaps Banks arrangement sturdier overall Banks innovationsat least think innovation respect Novice Pennyplane modelingthat am dead certain step right direction extremely wide prop blades moderate pitch Now kiddies slump seats shut eyes am about theory half death result simple rather easily product review product review product review Mechanical Speed Reducer Serving same purpose electric power prop drivers gas engines device offers intriguing possibilities associated larger props driv en less motor rpm precisionmade reducer enables swinging larger prop thrust aerodynamic efficiency Scale-size props feasible High-quality tim ing belt precision timing pulleys insure long life almost silent operation Replace ment belts available separately $2995 Astro Flight Inc 1337 Beach Ave Venice CA 90291 product review product review product review defended theory maximum flight duration rubber weight should twice weight model rubber quite few conditions assumptions met however theory applicable structural weight independent rub ber weight assumption certain ly valid conventional Pennyplanes cause 31-gram minimum weight rule Another assumption prop efficiency independent rubber weight think theory practice might diverge because anything wrong theory cause conditions underlying vi olated increase rubber weight first lets say increase width rubber model climbs gusto deadsticks mile floor flight du ration suffers So increase length rubberthereby also increasing its weightuntil model lands just enough turns left keep slack out motor Although prop rpm has increased because greater rub ber cross section greater gross weight model turns wound motor have increased greater factor because increased motor length duration flight has increased havent already exceeded motor-weight-equals-twice-the-structuralweight rule conditions theory havent violated best knowledge nobody has ever approached theoretical optimum degree success best rubber weight about equals structural weight weight-rule-limited models After unsuccessful attempt up performance Novice Pennyplane using 30-in loop A-in rub ber weighing 30% structural weight mentioned results Clarence Mather replied something effect increasing rubber weight doesnt always increase flight performance rubber length tuned model neither lands too turns left nor dead-sticks countered excuse based fact such long 94 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-RAY dealers sold themSHALL WE SAY MORE Audreses Aicratt Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 C Support AMA Price $3995 kit per dollar bar em motor33 times hook spacingknots up easily Clarence made clear remark applied absence effect Well Clarence given squandering words reckless abandon did bit head-scratchin over Clar ences remark relation several rather unsuccessful attempts increase duration increasing rubber weight ol baldy about lay Novice Pennyplanes have prop-diam eter limitation 12-in order get such relatively small prop absorb lots power thereby requiring lots rubber tempting increase pitch Thats great up point easy get point blades arent up job stall power input has increased increase pitch power output prop has creased proportion fact might have decreased following pearls wisdom follow seem substantiated recent experiences High pitch OK long coupled large blade width pushing rubber-weight-syn drome beyond reason might lead success might better off short skinny motor above remarks apply high-ceiling flying might indeed probably apply low-ceiling fly ing prop efficiency during initial power burst probably important model going get up ceiling anyhow doesnt climb hot simply will required bang its head against ceiling shorter time What counts low-ceiling flying rafter-banging name game prop efficiency during cruise de scent game might well skinny high-pitch props optimum Meanwhile Banks formula2-in wide blades pitch 22 inseems pretty close optimum conditions Whew Incidentally dont let Banks fellow out sight has recently re turned modeling after absence quarter century spies tell has seen company Clarence Mather maybe some good stuff coming off him whats worse seems have few ideas own event bears watching Tenth Annual NFFS Sympo whompin 152 pages long 1977 edition signals tenth anniversary unique publica tion Included large section covering ten Models Year fine three-view drawing model Bruce Elwanda Hannah photos descrip tions models development Model types include indoor outdoor rubber gas power towline gliders bulk report devoted tech nical papers range ex tremely theoretical down-home practical Included papers towline glider design performance analysis rubber-power gas-power props tricky airfoils wing wing-tip shapes warpand flutter-resistant structures rubberpower gas model performance analy sis about finding thermals prices please fasten seat belts members both NFFS AMA residing USA non-residents $800 others $900 Mailing charges Fourth class US Canada Mexico 75airmail Canada Mexico $225 Europe $335 Far East $465 Special deals available bulk orders Order Jack Brown 20267 Northbrook Sq Cu pertino CA 92067 price may seem high actually less per page recent years Great Speckled Bird can say what like about aesthetics George Perrymans models highly unlikely timer would confuse Georges mod els someone elses Great Speck led Bird no exception GSB took first place unofficial Unlimited event 1976 Nats event consisted single flight no max just after dawn close can get test models performance aid thermals 1977 Nats Georges GSB helped him qualify Mulvihill Tro phyawarded highest time Un limited Rubber event regardless age contestantwhich George has tried desperately win years drawing shows Georges inDecember 1977 95 ventions one-and-one-half-blade prop George calls little feller mini-blade theory evens out hole lift distribution left main blade something like main blade incidentally built-up tissuecovered construction prop used win 1976 Unlimited Unlimited event now resides display rotunda Meuser Memorial Library Museum prop used win Mulvihill George least conventional cant say sure whether little hooks ends blades help much sure cant hurt Scale Nuts Only National Air Space Museum has published volume called Aircraft National Air Space Museum comprehensive catalog Museums extensive aero nautical collection includes historical information three-view drawings planes display Museum lists locations remaining aircraft 225 black-and-white photos 128-page soft-cover book 12 color photos covers price $275 postpaid Checks money orders should made payable Smith sonian Institution dont send cash Order National Air Space Museum Publications Smithsonian Institution Washington DC 20560 Bob Meuser 4200 Gregory Si. Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control79 Andrews Aircraft Model Co94 Coverite3 Cox Hobbies Inc31 Davis Diesel Development88 Du-Bro Products91 EK-Logictrol5 Flyline Models88 Fox Mfg Company5 Carl Goldberg Models Inside Front Cover Grish Brothers80 Hobbypoxy85 K&BMfg81 Midwest Products Company4 Morrison Repla-Tech90 Pactra Industries89 Peck-Polymers92 Proctor Ent Corp88 Progress Mfg Company54 R/C Buyers Guide95 Rocket City Specialties90 Sig Mfg Company1 SC Modeler86 Sterling Models Inc82 Sullivan Products83 Tatone Products Inc93 Westport International87 Williams Brothers90 World EnginesBack Cover 96 Model Aviation
Edition: Model Aviation - 1977/12
Page Numbers: 52, 53, 93, 94, 95, 96
Duralion El Bob Meuser 100 540 438 1675 30rt 0dn JZ55dz4P 00 V 8oA KL- ibd 22tL 473 Power i4 strands 475 long Fill 6eo rge Perryman s 1ZCAC SPeCkLED B11D Emile Gouverne France displays super-highAR solid wing Wakefield spans 111 appears have three polyhedral breaks counting center Photo Ron Moulton BEYOND BELIEFF Beyond Belief No matter spell it correct Dan Beliefls Indoor Category Hand Launch Glider record has topped margin 38% Stan Stoy did mite Stoy toy called Coot presented column De cember 1975 issue Indoor HLG flier gets total nine flights total duration best two counts Stoys 1088-second best score made during first four nine-flight record attempts four series bettered record handily wasnt fluke rather repeatable performance quarter century Category 35-ft max ceiling height record has inched up second time fel lows like Lee Hines Ron Wittman Dan Beliefis record 788 seconds has 52 Model Aviation S lVei9ht3 Winq fzis 5tab Prop /2ubber 112 OZ 96 28 93 329 4oo 729 George Perrymans Mulvihill Trophy winner Great Speckled Bird Theres no mistaking Perryman bird people stopped poking fun George generation agohe has such remark able record odd-looking rubber models Both Perryman photographs taken Bob Meuser o4o /4 / 5-1 / K2z -I * -y 5 / / /2 arc S Cover boitom tbken I0 1z 2 / f 2ubber a66 tO 090 23 IV dournthrus r Winq 4 wash /efi dihedral joint Stab left tifi Cezar Patks 4flat -Y 2 1/ M1/crclzZe 3 05 2fLat 205 64 7i7 /4 j05 c / 10 16 74 Wiu9 Prov A//else Total 03/az 88q 023 65 058 765 /td 3/ Caterorq I/if Oien /Vationa/ I2ecord fliS aDOUT ciose rerryman prop gets being conventionalmight useful selfdefense Look closely blade tips books since 1969 quantum jump performance achieved flights made gym Texas Christian University air-conditioning system running air ex tremely turbulent Normally turbulence spells death low-ceiling indoor flight Stoys model trimmed take ad vantage turbulence CG well forward about 25% root chord making extremely stable model would respond rapidly changing wind direction model tended zip through downdrafts slow down updrafts spending time ups downs several occasions actually gained altitude about three feet crackduring its longer flights lasted over minute air vents near ceiling equal number inlets outlets no net vertical air flow model flying vertical wind tunnel Continued page 93 December1977 53 020 tO 025 i2d22/7 49 35 Form 1-qa/jug 770 J2014CE pEt2rgpLAt2urn 34s July 37911 Smoking may great health tobacco smoke helps cure warps microfilmcovered surfaces Cezar Banks demonstrates record Novice Pennyplane has several design innovations warrant serious attention 5MUF- L- IT SERIES NEW PRODUCTS /A PISTON SETTING TOOL MUST FOR 4693 25EVERY _CLUB PA MUFFLER/8111 CAR MUFFLER K B 21 QT 15500 Mufflers 149for II E3I0 PIPECALUMET SERIES DIQIZOO SCALE INSTRUMENT KITS 2/45/26 IMERS 7/26 1/2FUEL CUT OFF 1150 ALL SIZES 279DETHERMALIZER 1150 THE WORLDS LARGEST LINE OF MUFFLERS AND ENGINE electric pump Ear Protectors must wear ear pro tectors Whether muff plug type Per manent hearing loss will result use Engine The intend run Props As recommended manufacturer Plugs A good idea have two brands same type recommended manu facturer Tools Enough tighten engine mount change prop plug plus correct tools dismantle engine Fuel As recommended manufacturer Battery To fire glow plug Lots clean rags wipe clean Notebook keep records engine per formance Optional Equipment Tachometer Mechanical optical Stopwatch time duration runs using small volume tank Electric Starter use bushing engines Examine flying equipment put together special test stand set up de scribed above next column will de scribe prepare new engine test running following column will take out run engine develop some really important skills Don Jehilk 438A Schweer Dr Star Route Hawthorne NV 89415 FF Duration/Meuser continued page 53 About Rules Rules never foolproof always loopholes simply because no rules-makers crystal ball good So what loophole found changes character event originally intended change rules Sometimes dozens examples few come mind original rules Indoor Paper Stick inadvertently per mitted use microfilm covered prop got fixed Drop gliderssmall micro film-covered gliders held over head dropped thermal rising section floor heated sun lightwere ruled out Indoor HL Glider events Vertical takeoff hydro models eliminated rules change such changes often best interests sport whole someone suffers National records made under old rules go down crack does development models fit loopholes old rules have made several ruleschange proposals currently being weighed FF Contest Board will cause some suffering passed CB members will have decide whether suffering few compensated benefit decisions Im sure will come easily So already have heard proposal re-rig rules such way dynamic soaring sort utilized Stan Stoys Indoor HL Glider record breaker will legal such change rules would wipe Stoys record books render impotent development skills utilize dynamic soaring advantage such changes would seem best interest sport Perhaps should mention pro posal re-rig rules prohibit dy namic soaring came Stan Stoy rules-change proposal once made cluded provision permanent national records established records dropped books result rules change publication list such permanent records few years sothat accomplishments would forgotten Contest Board rep resentatives threw out proposal hard bounced Well cant win em Outstanding Performances Outstanding record-breaking performances sure youll never see AMA National Records list Fifth Max-Men FAI Annual Bob White put up 14 consecutive maxes Wakefield event nosing out Bill Bogarts record two-day affair qualify national record flights must made same day Lee Hines did same Nordic glider event fourth anDecember 1977 93 nual Nineteen consecutive 5-minute maxes total score 98 mm 14 sec far astounding gas model perform ance since Max invented Bob Scully did big Supertigre 65powered Satellite 1188 Thunderbugs Annual doesnt qualify offi cial record because done night qualify flights must made tween sunrise sunset incidentally Satellites took top honors gas-power event Sometimes Hate Job especially hate have make hero out some upstart undermines founda tion fragile pillar glory beats own game keep telling myself winning isnt everything little feller inside headbone says Yes sure beats heck out losing So teary eye heavy heart hereby discharge duties imposed fate Editor tell Cezar J Banks copped Category III Novice Pennyplane record worst part did fair square golly wish cheated just little Actually record time didnt equal Bill Xenakis year-old Senior record fitting clob bered doubt however Banks time 1134 will beaten awhile least substantial margin Banks model isnt simply ordinary model well flown has some unique innovations Whether innovations significant improve ments anybodys guess surely didnt hurt anything innovation fairing behind leading-edge spar Certainly turbulence induced behind conventional spar can serve no useful purpose simple fair ing such Banks used must eliminate major part turbulence its sociated drag Fairing rear spar ever might mistake does purposely what happens indoor model trailing edge automatically called Blubaugh Gieskieng fenceor recently Gurney fenceand sorts good things attributed substitution stab-tip rudders conventional single rudder another novation least relation contempo rary indoor modeling Stab-tip rudders probably act tip plates increasing effective aspect ratio stabilizing influ ence stab significant knows Such arrangement might have practical advantages however under slung rudders have broken occasionally although breaks have easily fixed once didnt notice break price sloppy pre-flight inspection poor official flight like think though underslung rudder pro tects stab during landing Perhaps Banks arrangement sturdier overall Banks innovationsat least think innovation respect Novice Pennyplane modelingthat am dead certain step right direction extremely wide prop blades moderate pitch Now kiddies slump seats shut eyes am about theory half death result simple rather easily product review product review product review Mechanical Speed Reducer Serving same purpose electric power prop drivers gas engines device offers intriguing possibilities associated larger props driv en less motor rpm precisionmade reducer enables swinging larger prop thrust aerodynamic efficiency Scale-size props feasible High-quality tim ing belt precision timing pulleys insure long life almost silent operation Replace ment belts available separately $2995 Astro Flight Inc 1337 Beach Ave Venice CA 90291 product review product review product review defended theory maximum flight duration rubber weight should twice weight model rubber quite few conditions assumptions met however theory applicable structural weight independent rub ber weight assumption certain ly valid conventional Pennyplanes cause 31-gram minimum weight rule Another assumption prop efficiency independent rubber weight think theory practice might diverge because anything wrong theory cause conditions underlying vi olated increase rubber weight first lets say increase width rubber model climbs gusto deadsticks mile floor flight du ration suffers So increase length rubberthereby also increasing its weightuntil model lands just enough turns left keep slack out motor Although prop rpm has increased because greater rub ber cross section greater gross weight model turns wound motor have increased greater factor because increased motor length duration flight has increased havent already exceeded motor-weight-equals-twice-the-structuralweight rule conditions theory havent violated best knowledge nobody has ever approached theoretical optimum degree success best rubber weight about equals structural weight weight-rule-limited models After unsuccessful attempt up performance Novice Pennyplane using 30-in loop A-in rub ber weighing 30% structural weight mentioned results Clarence Mather replied something effect increasing rubber weight doesnt always increase flight performance rubber length tuned model neither lands too turns left nor dead-sticks countered excuse based fact such long 94 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-RAY dealers sold themSHALL WE SAY MORE Audreses Aicratt Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 C Support AMA Price $3995 kit per dollar bar em motor33 times hook spacingknots up easily Clarence made clear remark applied absence effect Well Clarence given squandering words reckless abandon did bit head-scratchin over Clar ences remark relation several rather unsuccessful attempts increase duration increasing rubber weight ol baldy about lay Novice Pennyplanes have prop-diam eter limitation 12-in order get such relatively small prop absorb lots power thereby requiring lots rubber tempting increase pitch Thats great up point easy get point blades arent up job stall power input has increased increase pitch power output prop has creased proportion fact might have decreased following pearls wisdom follow seem substantiated recent experiences High pitch OK long coupled large blade width pushing rubber-weight-syn drome beyond reason might lead success might better off short skinny motor above remarks apply high-ceiling flying might indeed probably apply low-ceiling fly ing prop efficiency during initial power burst probably important model going get up ceiling anyhow doesnt climb hot simply will required bang its head against ceiling shorter time What counts low-ceiling flying rafter-banging name game prop efficiency during cruise de scent game might well skinny high-pitch props optimum Meanwhile Banks formula2-in wide blades pitch 22 inseems pretty close optimum conditions Whew Incidentally dont let Banks fellow out sight has recently re turned modeling after absence quarter century spies tell has seen company Clarence Mather maybe some good stuff coming off him whats worse seems have few ideas own event bears watching Tenth Annual NFFS Sympo whompin 152 pages long 1977 edition signals tenth anniversary unique publica tion Included large section covering ten Models Year fine three-view drawing model Bruce Elwanda Hannah photos descrip tions models development Model types include indoor outdoor rubber gas power towline gliders bulk report devoted tech nical papers range ex tremely theoretical down-home practical Included papers towline glider design performance analysis rubber-power gas-power props tricky airfoils wing wing-tip shapes warpand flutter-resistant structures rubberpower gas model performance analy sis about finding thermals prices please fasten seat belts members both NFFS AMA residing USA non-residents $800 others $900 Mailing charges Fourth class US Canada Mexico 75airmail Canada Mexico $225 Europe $335 Far East $465 Special deals available bulk orders Order Jack Brown 20267 Northbrook Sq Cu pertino CA 92067 price may seem high actually less per page recent years Great Speckled Bird can say what like about aesthetics George Perrymans models highly unlikely timer would confuse Georges mod els someone elses Great Speck led Bird no exception GSB took first place unofficial Unlimited event 1976 Nats event consisted single flight no max just after dawn close can get test models performance aid thermals 1977 Nats Georges GSB helped him qualify Mulvihill Tro phyawarded highest time Un limited Rubber event regardless age contestantwhich George has tried desperately win years drawing shows Georges inDecember 1977 95 ventions one-and-one-half-blade prop George calls little feller mini-blade theory evens out hole lift distribution left main blade something like main blade incidentally built-up tissuecovered construction prop used win 1976 Unlimited Unlimited event now resides display rotunda Meuser Memorial Library Museum prop used win Mulvihill George least conventional cant say sure whether little hooks ends blades help much sure cant hurt Scale Nuts Only National Air Space Museum has published volume called Aircraft National Air Space Museum comprehensive catalog Museums extensive aero nautical collection includes historical information three-view drawings planes display Museum lists locations remaining aircraft 225 black-and-white photos 128-page soft-cover book 12 color photos covers price $275 postpaid Checks money orders should made payable Smith sonian Institution dont send cash Order National Air Space Museum Publications Smithsonian Institution Washington DC 20560 Bob Meuser 4200 Gregory Si. Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control79 Andrews Aircraft Model Co94 Coverite3 Cox Hobbies Inc31 Davis Diesel Development88 Du-Bro Products91 EK-Logictrol5 Flyline Models88 Fox Mfg Company5 Carl Goldberg Models Inside Front Cover Grish Brothers80 Hobbypoxy85 K&BMfg81 Midwest Products Company4 Morrison Repla-Tech90 Pactra Industries89 Peck-Polymers92 Proctor Ent Corp88 Progress Mfg Company54 R/C Buyers Guide95 Rocket City Specialties90 Sig Mfg Company1 SC Modeler86 Sterling Models Inc82 Sullivan Products83 Tatone Products Inc93 Westport International87 Williams Brothers90 World EnginesBack Cover 96 Model Aviation
Edition: Model Aviation - 1977/12
Page Numbers: 52, 53, 93, 94, 95, 96
Duralion El Bob Meuser 100 540 438 1675 30rt 0dn JZ55dz4P 00 V 8oA KL- ibd 22tL 473 Power i4 strands 475 long Fill 6eo rge Perryman s 1ZCAC SPeCkLED B11D Emile Gouverne France displays super-highAR solid wing Wakefield spans 111 appears have three polyhedral breaks counting center Photo Ron Moulton BEYOND BELIEFF Beyond Belief No matter spell it correct Dan Beliefls Indoor Category Hand Launch Glider record has topped margin 38% Stan Stoy did mite Stoy toy called Coot presented column De cember 1975 issue Indoor HLG flier gets total nine flights total duration best two counts Stoys 1088-second best score made during first four nine-flight record attempts four series bettered record handily wasnt fluke rather repeatable performance quarter century Category 35-ft max ceiling height record has inched up second time fel lows like Lee Hines Ron Wittman Dan Beliefis record 788 seconds has 52 Model Aviation S lVei9ht3 Winq fzis 5tab Prop /2ubber 112 OZ 96 28 93 329 4oo 729 George Perrymans Mulvihill Trophy winner Great Speckled Bird Theres no mistaking Perryman bird people stopped poking fun George generation agohe has such remark able record odd-looking rubber models Both Perryman photographs taken Bob Meuser o4o /4 / 5-1 / K2z -I * -y 5 / / /2 arc S Cover boitom tbken I0 1z 2 / f 2ubber a66 tO 090 23 IV dournthrus r Winq 4 wash /efi dihedral joint Stab left tifi Cezar Patks 4flat -Y 2 1/ M1/crclzZe 3 05 2fLat 205 64 7i7 /4 j05 c / 10 16 74 Wiu9 Prov A//else Total 03/az 88q 023 65 058 765 /td 3/ Caterorq I/if Oien /Vationa/ I2ecord fliS aDOUT ciose rerryman prop gets being conventionalmight useful selfdefense Look closely blade tips books since 1969 quantum jump performance achieved flights made gym Texas Christian University air-conditioning system running air ex tremely turbulent Normally turbulence spells death low-ceiling indoor flight Stoys model trimmed take ad vantage turbulence CG well forward about 25% root chord making extremely stable model would respond rapidly changing wind direction model tended zip through downdrafts slow down updrafts spending time ups downs several occasions actually gained altitude about three feet crackduring its longer flights lasted over minute air vents near ceiling equal number inlets outlets no net vertical air flow model flying vertical wind tunnel Continued page 93 December1977 53 020 tO 025 i2d22/7 49 35 Form 1-qa/jug 770 J2014CE pEt2rgpLAt2urn 34s July 37911 Smoking may great health tobacco smoke helps cure warps microfilmcovered surfaces Cezar Banks demonstrates record Novice Pennyplane has several design innovations warrant serious attention 5MUF- L- IT SERIES NEW PRODUCTS /A PISTON SETTING TOOL MUST FOR 4693 25EVERY _CLUB PA MUFFLER/8111 CAR MUFFLER K B 21 QT 15500 Mufflers 149for II E3I0 PIPECALUMET SERIES DIQIZOO SCALE INSTRUMENT KITS 2/45/26 IMERS 7/26 1/2FUEL CUT OFF 1150 ALL SIZES 279DETHERMALIZER 1150 THE WORLDS LARGEST LINE OF MUFFLERS AND ENGINE electric pump Ear Protectors must wear ear pro tectors Whether muff plug type Per manent hearing loss will result use Engine The intend run Props As recommended manufacturer Plugs A good idea have two brands same type recommended manu facturer Tools Enough tighten engine mount change prop plug plus correct tools dismantle engine Fuel As recommended manufacturer Battery To fire glow plug Lots clean rags wipe clean Notebook keep records engine per formance Optional Equipment Tachometer Mechanical optical Stopwatch time duration runs using small volume tank Electric Starter use bushing engines Examine flying equipment put together special test stand set up de scribed above next column will de scribe prepare new engine test running following column will take out run engine develop some really important skills Don Jehilk 438A Schweer Dr Star Route Hawthorne NV 89415 FF Duration/Meuser continued page 53 About Rules Rules never foolproof always loopholes simply because no rules-makers crystal ball good So what loophole found changes character event originally intended change rules Sometimes dozens examples few come mind original rules Indoor Paper Stick inadvertently per mitted use microfilm covered prop got fixed Drop gliderssmall micro film-covered gliders held over head dropped thermal rising section floor heated sun lightwere ruled out Indoor HL Glider events Vertical takeoff hydro models eliminated rules change such changes often best interests sport whole someone suffers National records made under old rules go down crack does development models fit loopholes old rules have made several ruleschange proposals currently being weighed FF Contest Board will cause some suffering passed CB members will have decide whether suffering few compensated benefit decisions Im sure will come easily So already have heard proposal re-rig rules such way dynamic soaring sort utilized Stan Stoys Indoor HL Glider record breaker will legal such change rules would wipe Stoys record books render impotent development skills utilize dynamic soaring advantage such changes would seem best interest sport Perhaps should mention pro posal re-rig rules prohibit dy namic soaring came Stan Stoy rules-change proposal once made cluded provision permanent national records established records dropped books result rules change publication list such permanent records few years sothat accomplishments would forgotten Contest Board rep resentatives threw out proposal hard bounced Well cant win em Outstanding Performances Outstanding record-breaking performances sure youll never see AMA National Records list Fifth Max-Men FAI Annual Bob White put up 14 consecutive maxes Wakefield event nosing out Bill Bogarts record two-day affair qualify national record flights must made same day Lee Hines did same Nordic glider event fourth anDecember 1977 93 nual Nineteen consecutive 5-minute maxes total score 98 mm 14 sec far astounding gas model perform ance since Max invented Bob Scully did big Supertigre 65powered Satellite 1188 Thunderbugs Annual doesnt qualify offi cial record because done night qualify flights must made tween sunrise sunset incidentally Satellites took top honors gas-power event Sometimes Hate Job especially hate have make hero out some upstart undermines founda tion fragile pillar glory beats own game keep telling myself winning isnt everything little feller inside headbone says Yes sure beats heck out losing So teary eye heavy heart hereby discharge duties imposed fate Editor tell Cezar J Banks copped Category III Novice Pennyplane record worst part did fair square golly wish cheated just little Actually record time didnt equal Bill Xenakis year-old Senior record fitting clob bered doubt however Banks time 1134 will beaten awhile least substantial margin Banks model isnt simply ordinary model well flown has some unique innovations Whether innovations significant improve ments anybodys guess surely didnt hurt anything innovation fairing behind leading-edge spar Certainly turbulence induced behind conventional spar can serve no useful purpose simple fair ing such Banks used must eliminate major part turbulence its sociated drag Fairing rear spar ever might mistake does purposely what happens indoor model trailing edge automatically called Blubaugh Gieskieng fenceor recently Gurney fenceand sorts good things attributed substitution stab-tip rudders conventional single rudder another novation least relation contempo rary indoor modeling Stab-tip rudders probably act tip plates increasing effective aspect ratio stabilizing influ ence stab significant knows Such arrangement might have practical advantages however under slung rudders have broken occasionally although breaks have easily fixed once didnt notice break price sloppy pre-flight inspection poor official flight like think though underslung rudder pro tects stab during landing Perhaps Banks arrangement sturdier overall Banks innovationsat least think innovation respect Novice Pennyplane modelingthat am dead certain step right direction extremely wide prop blades moderate pitch Now kiddies slump seats shut eyes am about theory half death result simple rather easily product review product review product review Mechanical Speed Reducer Serving same purpose electric power prop drivers gas engines device offers intriguing possibilities associated larger props driv en less motor rpm precisionmade reducer enables swinging larger prop thrust aerodynamic efficiency Scale-size props feasible High-quality tim ing belt precision timing pulleys insure long life almost silent operation Replace ment belts available separately $2995 Astro Flight Inc 1337 Beach Ave Venice CA 90291 product review product review product review defended theory maximum flight duration rubber weight should twice weight model rubber quite few conditions assumptions met however theory applicable structural weight independent rub ber weight assumption certain ly valid conventional Pennyplanes cause 31-gram minimum weight rule Another assumption prop efficiency independent rubber weight think theory practice might diverge because anything wrong theory cause conditions underlying vi olated increase rubber weight first lets say increase width rubber model climbs gusto deadsticks mile floor flight du ration suffers So increase length rubberthereby also increasing its weightuntil model lands just enough turns left keep slack out motor Although prop rpm has increased because greater rub ber cross section greater gross weight model turns wound motor have increased greater factor because increased motor length duration flight has increased havent already exceeded motor-weight-equals-twice-the-structuralweight rule conditions theory havent violated best knowledge nobody has ever approached theoretical optimum degree success best rubber weight about equals structural weight weight-rule-limited models After unsuccessful attempt up performance Novice Pennyplane using 30-in loop A-in rub ber weighing 30% structural weight mentioned results Clarence Mather replied something effect increasing rubber weight doesnt always increase flight performance rubber length tuned model neither lands too turns left nor dead-sticks countered excuse based fact such long 94 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-RAY dealers sold themSHALL WE SAY MORE Audreses Aicratt Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 C Support AMA Price $3995 kit per dollar bar em motor33 times hook spacingknots up easily Clarence made clear remark applied absence effect Well Clarence given squandering words reckless abandon did bit head-scratchin over Clar ences remark relation several rather unsuccessful attempts increase duration increasing rubber weight ol baldy about lay Novice Pennyplanes have prop-diam eter limitation 12-in order get such relatively small prop absorb lots power thereby requiring lots rubber tempting increase pitch Thats great up point easy get point blades arent up job stall power input has increased increase pitch power output prop has creased proportion fact might have decreased following pearls wisdom follow seem substantiated recent experiences High pitch OK long coupled large blade width pushing rubber-weight-syn drome beyond reason might lead success might better off short skinny motor above remarks apply high-ceiling flying might indeed probably apply low-ceiling fly ing prop efficiency during initial power burst probably important model going get up ceiling anyhow doesnt climb hot simply will required bang its head against ceiling shorter time What counts low-ceiling flying rafter-banging name game prop efficiency during cruise de scent game might well skinny high-pitch props optimum Meanwhile Banks formula2-in wide blades pitch 22 inseems pretty close optimum conditions Whew Incidentally dont let Banks fellow out sight has recently re turned modeling after absence quarter century spies tell has seen company Clarence Mather maybe some good stuff coming off him whats worse seems have few ideas own event bears watching Tenth Annual NFFS Sympo whompin 152 pages long 1977 edition signals tenth anniversary unique publica tion Included large section covering ten Models Year fine three-view drawing model Bruce Elwanda Hannah photos descrip tions models development Model types include indoor outdoor rubber gas power towline gliders bulk report devoted tech nical papers range ex tremely theoretical down-home practical Included papers towline glider design performance analysis rubber-power gas-power props tricky airfoils wing wing-tip shapes warpand flutter-resistant structures rubberpower gas model performance analy sis about finding thermals prices please fasten seat belts members both NFFS AMA residing USA non-residents $800 others $900 Mailing charges Fourth class US Canada Mexico 75airmail Canada Mexico $225 Europe $335 Far East $465 Special deals available bulk orders Order Jack Brown 20267 Northbrook Sq Cu pertino CA 92067 price may seem high actually less per page recent years Great Speckled Bird can say what like about aesthetics George Perrymans models highly unlikely timer would confuse Georges mod els someone elses Great Speck led Bird no exception GSB took first place unofficial Unlimited event 1976 Nats event consisted single flight no max just after dawn close can get test models performance aid thermals 1977 Nats Georges GSB helped him qualify Mulvihill Tro phyawarded highest time Un limited Rubber event regardless age contestantwhich George has tried desperately win years drawing shows Georges inDecember 1977 95 ventions one-and-one-half-blade prop George calls little feller mini-blade theory evens out hole lift distribution left main blade something like main blade incidentally built-up tissuecovered construction prop used win 1976 Unlimited Unlimited event now resides display rotunda Meuser Memorial Library Museum prop used win Mulvihill George least conventional cant say sure whether little hooks ends blades help much sure cant hurt Scale Nuts Only National Air Space Museum has published volume called Aircraft National Air Space Museum comprehensive catalog Museums extensive aero nautical collection includes historical information three-view drawings planes display Museum lists locations remaining aircraft 225 black-and-white photos 128-page soft-cover book 12 color photos covers price $275 postpaid Checks money orders should made payable Smith sonian Institution dont send cash Order National Air Space Museum Publications Smithsonian Institution Washington DC 20560 Bob Meuser 4200 Gregory Si. Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control79 Andrews Aircraft Model Co94 Coverite3 Cox Hobbies Inc31 Davis Diesel Development88 Du-Bro Products91 EK-Logictrol5 Flyline Models88 Fox Mfg Company5 Carl Goldberg Models Inside Front Cover Grish Brothers80 Hobbypoxy85 K&BMfg81 Midwest Products Company4 Morrison Repla-Tech90 Pactra Industries89 Peck-Polymers92 Proctor Ent Corp88 Progress Mfg Company54 R/C Buyers Guide95 Rocket City Specialties90 Sig Mfg Company1 SC Modeler86 Sterling Models Inc82 Sullivan Products83 Tatone Products Inc93 Westport International87 Williams Brothers90 World EnginesBack Cover 96 Model Aviation
Edition: Model Aviation - 1977/12
Page Numbers: 52, 53, 93, 94, 95, 96
Duralion El Bob Meuser 100 540 438 1675 30rt 0dn JZ55dz4P 00 V 8oA KL- ibd 22tL 473 Power i4 strands 475 long Fill 6eo rge Perryman s 1ZCAC SPeCkLED B11D Emile Gouverne France displays super-highAR solid wing Wakefield spans 111 appears have three polyhedral breaks counting center Photo Ron Moulton BEYOND BELIEFF Beyond Belief No matter spell it correct Dan Beliefls Indoor Category Hand Launch Glider record has topped margin 38% Stan Stoy did mite Stoy toy called Coot presented column De cember 1975 issue Indoor HLG flier gets total nine flights total duration best two counts Stoys 1088-second best score made during first four nine-flight record attempts four series bettered record handily wasnt fluke rather repeatable performance quarter century Category 35-ft max ceiling height record has inched up second time fel lows like Lee Hines Ron Wittman Dan Beliefis record 788 seconds has 52 Model Aviation S lVei9ht3 Winq fzis 5tab Prop /2ubber 112 OZ 96 28 93 329 4oo 729 George Perrymans Mulvihill Trophy winner Great Speckled Bird Theres no mistaking Perryman bird people stopped poking fun George generation agohe has such remark able record odd-looking rubber models Both Perryman photographs taken Bob Meuser o4o /4 / 5-1 / K2z -I * -y 5 / / /2 arc S Cover boitom tbken I0 1z 2 / f 2ubber a66 tO 090 23 IV dournthrus r Winq 4 wash /efi dihedral joint Stab left tifi Cezar Patks 4flat -Y 2 1/ M1/crclzZe 3 05 2fLat 205 64 7i7 /4 j05 c / 10 16 74 Wiu9 Prov A//else Total 03/az 88q 023 65 058 765 /td 3/ Caterorq I/if Oien /Vationa/ I2ecord fliS aDOUT ciose rerryman prop gets being conventionalmight useful selfdefense Look closely blade tips books since 1969 quantum jump performance achieved flights made gym Texas Christian University air-conditioning system running air ex tremely turbulent Normally turbulence spells death low-ceiling indoor flight Stoys model trimmed take ad vantage turbulence CG well forward about 25% root chord making extremely stable model would respond rapidly changing wind direction model tended zip through downdrafts slow down updrafts spending time ups downs several occasions actually gained altitude about three feet crackduring its longer flights lasted over minute air vents near ceiling equal number inlets outlets no net vertical air flow model flying vertical wind tunnel Continued page 93 December1977 53 020 tO 025 i2d22/7 49 35 Form 1-qa/jug 770 J2014CE pEt2rgpLAt2urn 34s July 37911 Smoking may great health tobacco smoke helps cure warps microfilmcovered surfaces Cezar Banks demonstrates record Novice Pennyplane has several design innovations warrant serious attention 5MUF- L- IT SERIES NEW PRODUCTS /A PISTON SETTING TOOL MUST FOR 4693 25EVERY _CLUB PA MUFFLER/8111 CAR MUFFLER K B 21 QT 15500 Mufflers 149for II E3I0 PIPECALUMET SERIES DIQIZOO SCALE INSTRUMENT KITS 2/45/26 IMERS 7/26 1/2FUEL CUT OFF 1150 ALL SIZES 279DETHERMALIZER 1150 THE WORLDS LARGEST LINE OF MUFFLERS AND ENGINE electric pump Ear Protectors must wear ear pro tectors Whether muff plug type Per manent hearing loss will result use Engine The intend run Props As recommended manufacturer Plugs A good idea have two brands same type recommended manu facturer Tools Enough tighten engine mount change prop plug plus correct tools dismantle engine Fuel As recommended manufacturer Battery To fire glow plug Lots clean rags wipe clean Notebook keep records engine per formance Optional Equipment Tachometer Mechanical optical Stopwatch time duration runs using small volume tank Electric Starter use bushing engines Examine flying equipment put together special test stand set up de scribed above next column will de scribe prepare new engine test running following column will take out run engine develop some really important skills Don Jehilk 438A Schweer Dr Star Route Hawthorne NV 89415 FF Duration/Meuser continued page 53 About Rules Rules never foolproof always loopholes simply because no rules-makers crystal ball good So what loophole found changes character event originally intended change rules Sometimes dozens examples few come mind original rules Indoor Paper Stick inadvertently per mitted use microfilm covered prop got fixed Drop gliderssmall micro film-covered gliders held over head dropped thermal rising section floor heated sun lightwere ruled out Indoor HL Glider events Vertical takeoff hydro models eliminated rules change such changes often best interests sport whole someone suffers National records made under old rules go down crack does development models fit loopholes old rules have made several ruleschange proposals currently being weighed FF Contest Board will cause some suffering passed CB members will have decide whether suffering few compensated benefit decisions Im sure will come easily So already have heard proposal re-rig rules such way dynamic soaring sort utilized Stan Stoys Indoor HL Glider record breaker will legal such change rules would wipe Stoys record books render impotent development skills utilize dynamic soaring advantage such changes would seem best interest sport Perhaps should mention pro posal re-rig rules prohibit dy namic soaring came Stan Stoy rules-change proposal once made cluded provision permanent national records established records dropped books result rules change publication list such permanent records few years sothat accomplishments would forgotten Contest Board rep resentatives threw out proposal hard bounced Well cant win em Outstanding Performances Outstanding record-breaking performances sure youll never see AMA National Records list Fifth Max-Men FAI Annual Bob White put up 14 consecutive maxes Wakefield event nosing out Bill Bogarts record two-day affair qualify national record flights must made same day Lee Hines did same Nordic glider event fourth anDecember 1977 93 nual Nineteen consecutive 5-minute maxes total score 98 mm 14 sec far astounding gas model perform ance since Max invented Bob Scully did big Supertigre 65powered Satellite 1188 Thunderbugs Annual doesnt qualify offi cial record because done night qualify flights must made tween sunrise sunset incidentally Satellites took top honors gas-power event Sometimes Hate Job especially hate have make hero out some upstart undermines founda tion fragile pillar glory beats own game keep telling myself winning isnt everything little feller inside headbone says Yes sure beats heck out losing So teary eye heavy heart hereby discharge duties imposed fate Editor tell Cezar J Banks copped Category III Novice Pennyplane record worst part did fair square golly wish cheated just little Actually record time didnt equal Bill Xenakis year-old Senior record fitting clob bered doubt however Banks time 1134 will beaten awhile least substantial margin Banks model isnt simply ordinary model well flown has some unique innovations Whether innovations significant improve ments anybodys guess surely didnt hurt anything innovation fairing behind leading-edge spar Certainly turbulence induced behind conventional spar can serve no useful purpose simple fair ing such Banks used must eliminate major part turbulence its sociated drag Fairing rear spar ever might mistake does purposely what happens indoor model trailing edge automatically called Blubaugh Gieskieng fenceor recently Gurney fenceand sorts good things attributed substitution stab-tip rudders conventional single rudder another novation least relation contempo rary indoor modeling Stab-tip rudders probably act tip plates increasing effective aspect ratio stabilizing influ ence stab significant knows Such arrangement might have practical advantages however under slung rudders have broken occasionally although breaks have easily fixed once didnt notice break price sloppy pre-flight inspection poor official flight like think though underslung rudder pro tects stab during landing Perhaps Banks arrangement sturdier overall Banks innovationsat least think innovation respect Novice Pennyplane modelingthat am dead certain step right direction extremely wide prop blades moderate pitch Now kiddies slump seats shut eyes am about theory half death result simple rather easily product review product review product review Mechanical Speed Reducer Serving same purpose electric power prop drivers gas engines device offers intriguing possibilities associated larger props driv en less motor rpm precisionmade reducer enables swinging larger prop thrust aerodynamic efficiency Scale-size props feasible High-quality tim ing belt precision timing pulleys insure long life almost silent operation Replace ment belts available separately $2995 Astro Flight Inc 1337 Beach Ave Venice CA 90291 product review product review product review defended theory maximum flight duration rubber weight should twice weight model rubber quite few conditions assumptions met however theory applicable structural weight independent rub ber weight assumption certain ly valid conventional Pennyplanes cause 31-gram minimum weight rule Another assumption prop efficiency independent rubber weight think theory practice might diverge because anything wrong theory cause conditions underlying vi olated increase rubber weight first lets say increase width rubber model climbs gusto deadsticks mile floor flight du ration suffers So increase length rubberthereby also increasing its weightuntil model lands just enough turns left keep slack out motor Although prop rpm has increased because greater rub ber cross section greater gross weight model turns wound motor have increased greater factor because increased motor length duration flight has increased havent already exceeded motor-weight-equals-twice-the-structuralweight rule conditions theory havent violated best knowledge nobody has ever approached theoretical optimum degree success best rubber weight about equals structural weight weight-rule-limited models After unsuccessful attempt up performance Novice Pennyplane using 30-in loop A-in rub ber weighing 30% structural weight mentioned results Clarence Mather replied something effect increasing rubber weight doesnt always increase flight performance rubber length tuned model neither lands too turns left nor dead-sticks countered excuse based fact such long 94 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-RAY dealers sold themSHALL WE SAY MORE Audreses Aicratt Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 C Support AMA Price $3995 kit per dollar bar em motor33 times hook spacingknots up easily Clarence made clear remark applied absence effect Well Clarence given squandering words reckless abandon did bit head-scratchin over Clar ences remark relation several rather unsuccessful attempts increase duration increasing rubber weight ol baldy about lay Novice Pennyplanes have prop-diam eter limitation 12-in order get such relatively small prop absorb lots power thereby requiring lots rubber tempting increase pitch Thats great up point easy get point blades arent up job stall power input has increased increase pitch power output prop has creased proportion fact might have decreased following pearls wisdom follow seem substantiated recent experiences High pitch OK long coupled large blade width pushing rubber-weight-syn drome beyond reason might lead success might better off short skinny motor above remarks apply high-ceiling flying might indeed probably apply low-ceiling fly ing prop efficiency during initial power burst probably important model going get up ceiling anyhow doesnt climb hot simply will required bang its head against ceiling shorter time What counts low-ceiling flying rafter-banging name game prop efficiency during cruise de scent game might well skinny high-pitch props optimum Meanwhile Banks formula2-in wide blades pitch 22 inseems pretty close optimum conditions Whew Incidentally dont let Banks fellow out sight has recently re turned modeling after absence quarter century spies tell has seen company Clarence Mather maybe some good stuff coming off him whats worse seems have few ideas own event bears watching Tenth Annual NFFS Sympo whompin 152 pages long 1977 edition signals tenth anniversary unique publica tion Included large section covering ten Models Year fine three-view drawing model Bruce Elwanda Hannah photos descrip tions models development Model types include indoor outdoor rubber gas power towline gliders bulk report devoted tech nical papers range ex tremely theoretical down-home practical Included papers towline glider design performance analysis rubber-power gas-power props tricky airfoils wing wing-tip shapes warpand flutter-resistant structures rubberpower gas model performance analy sis about finding thermals prices please fasten seat belts members both NFFS AMA residing USA non-residents $800 others $900 Mailing charges Fourth class US Canada Mexico 75airmail Canada Mexico $225 Europe $335 Far East $465 Special deals available bulk orders Order Jack Brown 20267 Northbrook Sq Cu pertino CA 92067 price may seem high actually less per page recent years Great Speckled Bird can say what like about aesthetics George Perrymans models highly unlikely timer would confuse Georges mod els someone elses Great Speck led Bird no exception GSB took first place unofficial Unlimited event 1976 Nats event consisted single flight no max just after dawn close can get test models performance aid thermals 1977 Nats Georges GSB helped him qualify Mulvihill Tro phyawarded highest time Un limited Rubber event regardless age contestantwhich George has tried desperately win years drawing shows Georges inDecember 1977 95 ventions one-and-one-half-blade prop George calls little feller mini-blade theory evens out hole lift distribution left main blade something like main blade incidentally built-up tissuecovered construction prop used win 1976 Unlimited Unlimited event now resides display rotunda Meuser Memorial Library Museum prop used win Mulvihill George least conventional cant say sure whether little hooks ends blades help much sure cant hurt Scale Nuts Only National Air Space Museum has published volume called Aircraft National Air Space Museum comprehensive catalog Museums extensive aero nautical collection includes historical information three-view drawings planes display Museum lists locations remaining aircraft 225 black-and-white photos 128-page soft-cover book 12 color photos covers price $275 postpaid Checks money orders should made payable Smith sonian Institution dont send cash Order National Air Space Museum Publications Smithsonian Institution Washington DC 20560 Bob Meuser 4200 Gregory Si. Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control79 Andrews Aircraft Model Co94 Coverite3 Cox Hobbies Inc31 Davis Diesel Development88 Du-Bro Products91 EK-Logictrol5 Flyline Models88 Fox Mfg Company5 Carl Goldberg Models Inside Front Cover Grish Brothers80 Hobbypoxy85 K&BMfg81 Midwest Products Company4 Morrison Repla-Tech90 Pactra Industries89 Peck-Polymers92 Proctor Ent Corp88 Progress Mfg Company54 R/C Buyers Guide95 Rocket City Specialties90 Sig Mfg Company1 SC Modeler86 Sterling Models Inc82 Sullivan Products83 Tatone Products Inc93 Westport International87 Williams Brothers90 World EnginesBack Cover 96 Model Aviation
Edition: Model Aviation - 1977/12
Page Numbers: 52, 53, 93, 94, 95, 96
Duralion El Bob Meuser 100 540 438 1675 30rt 0dn JZ55dz4P 00 V 8oA KL- ibd 22tL 473 Power i4 strands 475 long Fill 6eo rge Perryman s 1ZCAC SPeCkLED B11D Emile Gouverne France displays super-highAR solid wing Wakefield spans 111 appears have three polyhedral breaks counting center Photo Ron Moulton BEYOND BELIEFF Beyond Belief No matter spell it correct Dan Beliefls Indoor Category Hand Launch Glider record has topped margin 38% Stan Stoy did mite Stoy toy called Coot presented column De cember 1975 issue Indoor HLG flier gets total nine flights total duration best two counts Stoys 1088-second best score made during first four nine-flight record attempts four series bettered record handily wasnt fluke rather repeatable performance quarter century Category 35-ft max ceiling height record has inched up second time fel lows like Lee Hines Ron Wittman Dan Beliefis record 788 seconds has 52 Model Aviation S lVei9ht3 Winq fzis 5tab Prop /2ubber 112 OZ 96 28 93 329 4oo 729 George Perrymans Mulvihill Trophy winner Great Speckled Bird Theres no mistaking Perryman bird people stopped poking fun George generation agohe has such remark able record odd-looking rubber models Both Perryman photographs taken Bob Meuser o4o /4 / 5-1 / K2z -I * -y 5 / / /2 arc S Cover boitom tbken I0 1z 2 / f 2ubber a66 tO 090 23 IV dournthrus r Winq 4 wash /efi dihedral joint Stab left tifi Cezar Patks 4flat -Y 2 1/ M1/crclzZe 3 05 2fLat 205 64 7i7 /4 j05 c / 10 16 74 Wiu9 Prov A//else Total 03/az 88q 023 65 058 765 /td 3/ Caterorq I/if Oien /Vationa/ I2ecord fliS aDOUT ciose rerryman prop gets being conventionalmight useful selfdefense Look closely blade tips books since 1969 quantum jump performance achieved flights made gym Texas Christian University air-conditioning system running air ex tremely turbulent Normally turbulence spells death low-ceiling indoor flight Stoys model trimmed take ad vantage turbulence CG well forward about 25% root chord making extremely stable model would respond rapidly changing wind direction model tended zip through downdrafts slow down updrafts spending time ups downs several occasions actually gained altitude about three feet crackduring its longer flights lasted over minute air vents near ceiling equal number inlets outlets no net vertical air flow model flying vertical wind tunnel Continued page 93 December1977 53 020 tO 025 i2d22/7 49 35 Form 1-qa/jug 770 J2014CE pEt2rgpLAt2urn 34s July 37911 Smoking may great health tobacco smoke helps cure warps microfilmcovered surfaces Cezar Banks demonstrates record Novice Pennyplane has several design innovations warrant serious attention 5MUF- L- IT SERIES NEW PRODUCTS /A PISTON SETTING TOOL MUST FOR 4693 25EVERY _CLUB PA MUFFLER/8111 CAR MUFFLER K B 21 QT 15500 Mufflers 149for II E3I0 PIPECALUMET SERIES DIQIZOO SCALE INSTRUMENT KITS 2/45/26 IMERS 7/26 1/2FUEL CUT OFF 1150 ALL SIZES 279DETHERMALIZER 1150 THE WORLDS LARGEST LINE OF MUFFLERS AND ENGINE electric pump Ear Protectors must wear ear pro tectors Whether muff plug type Per manent hearing loss will result use Engine The intend run Props As recommended manufacturer Plugs A good idea have two brands same type recommended manu facturer Tools Enough tighten engine mount change prop plug plus correct tools dismantle engine Fuel As recommended manufacturer Battery To fire glow plug Lots clean rags wipe clean Notebook keep records engine per formance Optional Equipment Tachometer Mechanical optical Stopwatch time duration runs using small volume tank Electric Starter use bushing engines Examine flying equipment put together special test stand set up de scribed above next column will de scribe prepare new engine test running following column will take out run engine develop some really important skills Don Jehilk 438A Schweer Dr Star Route Hawthorne NV 89415 FF Duration/Meuser continued page 53 About Rules Rules never foolproof always loopholes simply because no rules-makers crystal ball good So what loophole found changes character event originally intended change rules Sometimes dozens examples few come mind original rules Indoor Paper Stick inadvertently per mitted use microfilm covered prop got fixed Drop gliderssmall micro film-covered gliders held over head dropped thermal rising section floor heated sun lightwere ruled out Indoor HL Glider events Vertical takeoff hydro models eliminated rules change such changes often best interests sport whole someone suffers National records made under old rules go down crack does development models fit loopholes old rules have made several ruleschange proposals currently being weighed FF Contest Board will cause some suffering passed CB members will have decide whether suffering few compensated benefit decisions Im sure will come easily So already have heard proposal re-rig rules such way dynamic soaring sort utilized Stan Stoys Indoor HL Glider record breaker will legal such change rules would wipe Stoys record books render impotent development skills utilize dynamic soaring advantage such changes would seem best interest sport Perhaps should mention pro posal re-rig rules prohibit dy namic soaring came Stan Stoy rules-change proposal once made cluded provision permanent national records established records dropped books result rules change publication list such permanent records few years sothat accomplishments would forgotten Contest Board rep resentatives threw out proposal hard bounced Well cant win em Outstanding Performances Outstanding record-breaking performances sure youll never see AMA National Records list Fifth Max-Men FAI Annual Bob White put up 14 consecutive maxes Wakefield event nosing out Bill Bogarts record two-day affair qualify national record flights must made same day Lee Hines did same Nordic glider event fourth anDecember 1977 93 nual Nineteen consecutive 5-minute maxes total score 98 mm 14 sec far astounding gas model perform ance since Max invented Bob Scully did big Supertigre 65powered Satellite 1188 Thunderbugs Annual doesnt qualify offi cial record because done night qualify flights must made tween sunrise sunset incidentally Satellites took top honors gas-power event Sometimes Hate Job especially hate have make hero out some upstart undermines founda tion fragile pillar glory beats own game keep telling myself winning isnt everything little feller inside headbone says Yes sure beats heck out losing So teary eye heavy heart hereby discharge duties imposed fate Editor tell Cezar J Banks copped Category III Novice Pennyplane record worst part did fair square golly wish cheated just little Actually record time didnt equal Bill Xenakis year-old Senior record fitting clob bered doubt however Banks time 1134 will beaten awhile least substantial margin Banks model isnt simply ordinary model well flown has some unique innovations Whether innovations significant improve ments anybodys guess surely didnt hurt anything innovation fairing behind leading-edge spar Certainly turbulence induced behind conventional spar can serve no useful purpose simple fair ing such Banks used must eliminate major part turbulence its sociated drag Fairing rear spar ever might mistake does purposely what happens indoor model trailing edge automatically called Blubaugh Gieskieng fenceor recently Gurney fenceand sorts good things attributed substitution stab-tip rudders conventional single rudder another novation least relation contempo rary indoor modeling Stab-tip rudders probably act tip plates increasing effective aspect ratio stabilizing influ ence stab significant knows Such arrangement might have practical advantages however under slung rudders have broken occasionally although breaks have easily fixed once didnt notice break price sloppy pre-flight inspection poor official flight like think though underslung rudder pro tects stab during landing Perhaps Banks arrangement sturdier overall Banks innovationsat least think innovation respect Novice Pennyplane modelingthat am dead certain step right direction extremely wide prop blades moderate pitch Now kiddies slump seats shut eyes am about theory half death result simple rather easily product review product review product review Mechanical Speed Reducer Serving same purpose electric power prop drivers gas engines device offers intriguing possibilities associated larger props driv en less motor rpm precisionmade reducer enables swinging larger prop thrust aerodynamic efficiency Scale-size props feasible High-quality tim ing belt precision timing pulleys insure long life almost silent operation Replace ment belts available separately $2995 Astro Flight Inc 1337 Beach Ave Venice CA 90291 product review product review product review defended theory maximum flight duration rubber weight should twice weight model rubber quite few conditions assumptions met however theory applicable structural weight independent rub ber weight assumption certain ly valid conventional Pennyplanes cause 31-gram minimum weight rule Another assumption prop efficiency independent rubber weight think theory practice might diverge because anything wrong theory cause conditions underlying vi olated increase rubber weight first lets say increase width rubber model climbs gusto deadsticks mile floor flight du ration suffers So increase length rubberthereby also increasing its weightuntil model lands just enough turns left keep slack out motor Although prop rpm has increased because greater rub ber cross section greater gross weight model turns wound motor have increased greater factor because increased motor length duration flight has increased havent already exceeded motor-weight-equals-twice-the-structuralweight rule conditions theory havent violated best knowledge nobody has ever approached theoretical optimum degree success best rubber weight about equals structural weight weight-rule-limited models After unsuccessful attempt up performance Novice Pennyplane using 30-in loop A-in rub ber weighing 30% structural weight mentioned results Clarence Mather replied something effect increasing rubber weight doesnt always increase flight performance rubber length tuned model neither lands too turns left nor dead-sticks countered excuse based fact such long 94 Model Aviation Kraftsmanship kit processed AAMCO GOLD BALSAThis Trainer will blow apart hits ground GREATEST R/C BASIC TRAINER Design & Kit ALL TIME Ask over 25000 satisfied builders H-RAY dealers sold themSHALL WE SAY MORE Audreses Aicratt Model Co Inc US Rte 1& North St Topsfield Mass 01983 887-8541 C Support AMA Price $3995 kit per dollar bar em motor33 times hook spacingknots up easily Clarence made clear remark applied absence effect Well Clarence given squandering words reckless abandon did bit head-scratchin over Clar ences remark relation several rather unsuccessful attempts increase duration increasing rubber weight ol baldy about lay Novice Pennyplanes have prop-diam eter limitation 12-in order get such relatively small prop absorb lots power thereby requiring lots rubber tempting increase pitch Thats great up point easy get point blades arent up job stall power input has increased increase pitch power output prop has creased proportion fact might have decreased following pearls wisdom follow seem substantiated recent experiences High pitch OK long coupled large blade width pushing rubber-weight-syn drome beyond reason might lead success might better off short skinny motor above remarks apply high-ceiling flying might indeed probably apply low-ceiling fly ing prop efficiency during initial power burst probably important model going get up ceiling anyhow doesnt climb hot simply will required bang its head against ceiling shorter time What counts low-ceiling flying rafter-banging name game prop efficiency during cruise de scent game might well skinny high-pitch props optimum Meanwhile Banks formula2-in wide blades pitch 22 inseems pretty close optimum conditions Whew Incidentally dont let Banks fellow out sight has recently re turned modeling after absence quarter century spies tell has seen company Clarence Mather maybe some good stuff coming off him whats worse seems have few ideas own event bears watching Tenth Annual NFFS Sympo whompin 152 pages long 1977 edition signals tenth anniversary unique publica tion Included large section covering ten Models Year fine three-view drawing model Bruce Elwanda Hannah photos descrip tions models development Model types include indoor outdoor rubber gas power towline gliders bulk report devoted tech nical papers range ex tremely theoretical down-home practical Included papers towline glider design performance analysis rubber-power gas-power props tricky airfoils wing wing-tip shapes warpand flutter-resistant structures rubberpower gas model performance analy sis about finding thermals prices please fasten seat belts members both NFFS AMA residing USA non-residents $800 others $900 Mailing charges Fourth class US Canada Mexico 75airmail Canada Mexico $225 Europe $335 Far East $465 Special deals available bulk orders Order Jack Brown 20267 Northbrook Sq Cu pertino CA 92067 price may seem high actually less per page recent years Great Speckled Bird can say what like about aesthetics George Perrymans models highly unlikely timer would confuse Georges mod els someone elses Great Speck led Bird no exception GSB took first place unofficial Unlimited event 1976 Nats event consisted single flight no max just after dawn close can get test models performance aid thermals 1977 Nats Georges GSB helped him qualify Mulvihill Tro phyawarded highest time Un limited Rubber event regardless age contestantwhich George has tried desperately win years drawing shows Georges inDecember 1977 95 ventions one-and-one-half-blade prop George calls little feller mini-blade theory evens out hole lift distribution left main blade something like main blade incidentally built-up tissuecovered construction prop used win 1976 Unlimited Unlimited event now resides display rotunda Meuser Memorial Library Museum prop used win Mulvihill George least conventional cant say sure whether little hooks ends blades help much sure cant hurt Scale Nuts Only National Air Space Museum has published volume called Aircraft National Air Space Museum comprehensive catalog Museums extensive aero nautical collection includes historical information three-view drawings planes display Museum lists locations remaining aircraft 225 black-and-white photos 128-page soft-cover book 12 color photos covers price $275 postpaid Checks money orders should made payable Smith sonian Institution dont send cash Order National Air Space Museum Publications Smithsonian Institution Washington DC 20560 Bob Meuser 4200 Gregory Si. Oak land CA 94619 ADVERTISERS INDEX Ace Radio Control79 Andrews Aircraft Model Co94 Coverite3 Cox Hobbies Inc31 Davis Diesel Development88 Du-Bro Products91 EK-Logictrol5 Flyline Models88 Fox Mfg Company5 Carl Goldberg Models Inside Front Cover Grish Brothers80 Hobbypoxy85 K&BMfg81 Midwest Products Company4 Morrison Repla-Tech90 Pactra Industries89 Peck-Polymers92 Proctor Ent Corp88 Progress Mfg Company54 R/C Buyers Guide95 Rocket City Specialties90 Sig Mfg Company1 SC Modeler86 Sterling Models Inc82 Sullivan Products83 Tatone Products Inc93 Westport International87 Williams Brothers90 World EnginesBack Cover 96 Model Aviation