Author launches 91-in Moth Minor plane looks should terrific performer flight time low 605 just WART program said would programs predictive powers substantiated model won NASA Scale Achievement Award 1983 Nats Author says wouldnt have begun construction numbers hadnt good ptm hg ruru LilirilpitEll warts COMPUTERS chose configuration What Just pick out makes blood sing take plunge Right No right Typical yes right such outbursts passion emerge turkeys defective genes psychotic souls turkeys end days hangar queens hobby room mobiles recognize turkey before build Certainly looks alone anyone smirking looks right will fly right would ask Have seen Don Srulls version Santos Dumont 14 bis Thats pusher canard biplane Don has successfully spanned application range Indoor Rubber Scale full RC anyone thinks oonfiguration looks right suggest quick return gamboling elves fairies gardenand leave striving us appearance what serve guide seek separate turkeys eagles Performance swer poetic descriptions perform ance heroic myths performance owe much chance 45-mm flights 52 Model Aviation listing WART program written M-Basic forthe Kaypro Ii Only slight moditications Basic language syntax should neces saryto makethe program run mostall personal computeraso itcan giveyou powertoseparatethe eaglestrom theturkeys advance everyday meat-and-potatoes perform ance Methods measuring performance fore construction have available years However process proved tedious reduce iron-willed tears arrival friendly com puters picture has change drastically Once right program stored innards computer can check out flight characteristics design few seconds Yes performance stability such esoteric topics big make tail can resolved before reach wax paper An example thing happens large Rubber Scale Im sucker clean lines felt fatal attraction P-39 Ignoring implications curious nickname Iron Dog feverishly built 1m-scale version turned out great turkeys time Despite Wakefield model load rubber 40gm has never cracked 35 sec its long misCerable life Check P-39 printout supplied WART programa Rubber Scale perRubber-powered models oldest types flying models ever built thanks some software written authors wife get assistance newest products market program can used predict flight characteristics save heartbreak spend ing hours constructing model cant made perform up expectations ELeon Bennett July1985 53 formance technique assembled local hacker wife left-most column gives W sum airframe weight rubber weight R final column T yields corresponding duration sec onds look R column interpolate bit between 38 43 estabish 40gm value can see equivalent duration time will roughly 34 sec prediction unfortunately quite accurate known never would have built foul thing takes about 45 sec competitive hereabouts can hope achieve 45 sec upping rubber 60 grams theres simply no place put stuff Yes turkey spotter WART program works well However eagles sensed equal ease Consider Moth Minor printout computer used design aid arriving right combination configuration rubber assure 1-mm flight despite all-up flying weight roughly 22 oz result ing model 91-in span probably worlds biggest Rubber Scale job dealing something far out ordinary experience cannot serve guide computers insistence 128gm rubber 16 strands -in FAI 4 ft long would yield time low 60-sec range would have lacked courage proceed model turned out well won NASA Na tional Assn Scale Aeromodelers Scale Achievement Award 1983 National Contest actual WART program given figure centered Jumbo Scale will handle kind rubber-powered flight after certain amount tinkering see Nitty-Gritty further Written M-Basic Kaypro II program development earlier version written satisfactorily run VIC-20 minor syntax modifica tions requiring elementary familiarity programming can adapted other personal computers print out useful element can just well printer on-screen output sufficient use program must supply following data 1 The wing area square inches 5 2 The airframe weight everything ex cept rubber grams 3 The glide ratio pure number form G Continued page 141 54 Model Aviation THE OR 05 Ai output programs analysis Moth Minor shows flight times excess 1 mm 128 grams rubber suggesting plane indeed eagles Output rom programs analysis OT authors P- turKey witn 40 grams OT rubber planes capacity has no chance reaching flight times competitive 45-sec range knowledge hand before starting construction can save yourself frustration can result building plane Just bcause looks right Authors iron Dog P-3m proved WART just adept finding turkeys confirmed good looks high hopes wont necessarily make good-flying model RC Helicopters/Jolly Continued page 51 line look forward seeing something new Toledo saw several Scale machines static competition no less four Airwolf/Heim 22s very nice Jet Ranger excellent Hind Mil 24d constructed Mike Robbins Toledo always great show year no exception wish would move later year cold weather something else months photos During recent visit OMP able view new prototype Gorham MF-1 target drone machine 10-ft-long range word awesome Intended training aid armed services drone features 22-hp engine weighs 75 pounds fuselage one-fifth scale Mu 24 Hind D typical type operated Soviets As can seen photos MF-l fliesand does very well Im sure wish John well projectand way dont look local hobby shop month also have some pictures personal Airwolf model fea tures own fiberglass fuselage Heim retracts GMP Competitor mechanics rotorhead prototype flybarless design GMP engine OS 60 FSR-H has proved excel lent power li-lb machine particular model has approximately 40 hours failures speaks well components used off-the-shelf items months three-view large Soviet military helicopter design Mil 24 goes back late Sixties United States already realizing potential armed military machine Indeed era Bell came up successful Cobra design Soviets took little longer get gunship service Hind D has proved capable dealing machines Mil 24 very large 56 ft length also very fast Hind cruises 175 mph range holds two world speed records its class Because Hind features articulated rotorhead nimble its US counterparts can however transport squad eight troops scene battle offer standoff protection well definite tankbusting capabilities no wonder NATO concerned rapid develop ment deployment formidable weapon no kit Hind D however have one-twelth scale fuselage available youre planning conquest western Europe BCNU Lariy Jolly 5501 W Como Santa Ana CA 92703 WART Program/Bennett Continued page 54 wing area taken straight plans consider portion wing either passing through fuselage blanketed fuselage high wing Count area sticking out breeze area given square feet multiply 144 convert square inches airframe weight includes absolutely everything carried aloft exception rubber convert ounces grams multiply 29 Usually given plans accompanying article can worked out see Nitty-Gritty glide ratio consists distance traveled horizontally foot verti cal drop Imagine test-gliding finished well-trimmed model height 6 ft launch perfect model travels say 18 ft horizontally fore hits ground G 18/6 3 G value reflects two separate qualities lift drag airfoils speeds trim settings us employ lift coefficient pretty close 10 However drag can vary over wide range depending cleanliness configuration also models size models Jumbo Scale size range list configurations cor responding G values given G Table have worked out either using drag coefficient ooncepts have set in-flight observations use table search among configu rations until find something cor responds cleanliness model pick out proper G factor Also see Nitty-Gritty additional G advice Rubber weight R need known point virtues WART program presents automatically wide range rubber motors everything light motor trimming purposes all-out heavyweight motor contest work program assumes possible range rubber weight values between limits 7% 33% have choice concerns increments ofRthat examined queried What step R should enter 5 R values used computation will 5gm apart find best way use feature home-in final answer choosing progressively finer increments design becomes seriously considered choose too fine increment early stages design tends produce avalanche data difficult handle table generated running pro gram supplies estimated duration motor possibility sense can simply choose printout motorduration combination like catch program assumes rubber being used effectively worrying Continued page 144 DGA DESIGNS /0 Full Body Pilot Kit eLightest Pilot available Lifeiike vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions Fuliy positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2 oz$ 795 lI4Scale4oz$ 995 1/3ScaieSoz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6 Scale 75 oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 sLightest bust pilot available sLifelike vinyl latex rubber parts sEasy assemble finish eBuild either barnstormer sportsman pilot skit contains pilot head helmet cap goggles jacket instructions See deaier order direct Add $100 shipping direct orders Send $100 current cataiog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-No COD 5 3 NION PNRFORMANCE 0*50 LAUNeNEE CLINERS ENOM CIGNYWEIGOT ALUMINUM NEVERACE CANS Two FULL SIZE PATTERNS TOOK CUOICELLOSTNATEE *ONITIONAL PATTEENN NION tACO ON Sb PACE PICE EBb SOUTOE*STENN P0 NONO tOOLErOB. oENB July1985 141 1j~MAGIC MAGNET BWLDERW ByEIdonJ Lind Co 2912 Walker Lee Los Alamitos CA 90720 about short noses balancing difficulties matching prop motor reasons must have some notion just much rubber practical configuration prop under study Some times plans will give rubber weight available might use R20% reasonable working figure Check Nitty-Gritty advice Drawbacks OK whats wrong Will future contests consist fliers hunched over consoles type entries Fear process has merit also has drawbacks greatest lack precision process works well turkey spotter Ditto eagle identification ever comes distinguishing good eagles better eagles hopeless tur keys more-hopeless turkeys system falters Introducing. #irebai1 RIC Idle-Bar Glow Plugs Also.Long Short$1 69 Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $129 SwansonAssociates PO Box 151 Wayne NJS,n 7948 07470 basic difficulty imprecise input concerns input operator bring computer also input stored within program example program assumes prop efficiency 50% evidence substantiate figure lower end tested Wakefield prop-efficiency numbers highly probable good Rubber Scale props 50% range However either prop-carving whiz dub might somewhat better considerably worse 50% As move away 50% predictive power program weakens input factors sort have built programranging type rubber mode flight short program works best adhere standard practices aspect mod eling As standard practices departed program becomes increasingly inaccurate second drawback computer makes no comment practical aspects design Weve already noted New completely automatic malr..., system wet galled cells No run-down batteries xplosive gasses generated undercharged inter storage problems No boiled-dry batteries tteotiox required-electronically overcharged maintains toll charge No e axxc pou a, JUST CONNECT ITTHEN FORGET IT 0005 on Mdspecify Bar 12 volt PO Box 221 $4995~araCanton SD 57013 Proacts 5A 987-5024 $250 S&H E information connection rubber weight other practical considerations ignoredeverything whether model will stay right-side-up field worthiness thermal sensitivity ROG capability tree slitherness work ing Nitty-Gritty following assumptions built program model powered rubber capable storing 2800 ft-lb energy per unit weight wound 75% max turns Hysteresis loss reduces energy returned 60% max poten tial Prop efficiency 50% mode flight slow cruise Available energy deduced rubber weight above efficiency factors expended work due drag Once energy consumed flight over other words flight mode described does consider climb glide effects upon duration sup port 1975 NFFS Sympo view rather modest climb rates subse quent glides typical Rubber Scale flight have little effect overall duration Given dead air would about well expending rubber energy steady cruising Wing area S top plan-view area wanted Given mild amount dihedral error involved ignoring dihedral effects small However considering wings exaggerated polyhedral will necessary reduce wing area horizontal projected area Airframe weight calculate work up total volume balsa cubic inches multiply two get weight grams average-density 8-lb balsa Add 20% weight glue Tissue weighs 1gm per 90 sq Music wire 1/16 weighs 5gm per lineal foot Glide ratio G Values given table based Reynolds numbers 100000 range scale corresponding large Jumbo Scale model assumed wing Clark Y section flying 20% less maximum lift coefficient Most listed drag values computed 144 Model Aviation An Ideal way build balsa construc ted model airplane wings fuselage stabilizers elevators rudders Build fast easy straight true Makes other methods obsolete CONTENTS 1 -16x48 STEEL PLATE 30- MAGNETS 60- MAGNETIC POLES 10-5 UPRIGHTS 10- 1 x 10/32 BOLTS 10-10/32 NUTS useful tool will last lifetime nothing wear out Magnetically holds balsa parts place glulng No damaged split weakened wood using pins WART Program/Bennett Continued page 141 nem Oxuier oroer xirecs AdO 5200 snipping avG handlingPO Box 05 Champaign IL 61020 classic expressions taken Schlichting Boundary Layer Theory McGraw Hill quick-and-dirty rule-of-thumb Jumbo Scale try following really clean go 5 average drag go 4 fairly draggy outsize fliselage cross section lots struts go 3 Rubber R maximum length rubber motor can effectively stored used bunching balance problems about three times distance prop hook center gravity CG Rubber weighs roughly 2gm per lineal foot -in FAI 16gm per foot -in Sig flying all-out perform ance event turns approaching max used ratherthan assumed 75% contained program can alter formula reflect increased energy level Duration directly proportional stored energy store 10% energy given weight rubber specffied program will extend duration 10% future go Will computer-assisted design wipe out turkeys leaving nothing eagles sky will computer prove monster destroying fun aspect mod eling reducing game bunch number crunching Its too early tell few programs have available today wont really change game time can expect programs everything prop design rib spacing As computer assumes every-growing role some whittler types may throw down razor blades leave Others will face reality study computing Yes difficult life-style deci tions will have made us concerning computer think married hacker Address questions and/or bitter zomplaints either Leon Bennett mod ler and/or Rachelle Bennett hacker 6 Rivercrest Rd Bronx NY 10471 replies please include SASE FF Duration/Murphy Continued page 57 length time As engine rpms increase dangers multiply some clubs have already taken strides endorse outlawing use wood props non-reinforced plastic props high-performance engines continuous-filament fiber glass/epoxy resin concepts appear put up best defense preventing associat ed mishaps Carbon fiber fiberglassreinforced plastic props obviously quite expensive since produced cottage industry present relatively inexpensive com pared price someones eye worse sooner commercially svailable reinforced concepts hit marSignal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $9795 check money order TTBT~ II u ox 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranty cted dealerships available ketplace safer flying field will new ultra-high-rpm ducted fan powerplants already beginning replace traditional Schneurle main stays thus causing greater safety concerns Appropriately-reinforced epoxy propellers definite requirement engines Maybe will need mal approval procedure prop manu facturers before long similar Underwriters Laboratories service electrical industry rate begin police problem ourselves could very possibly receive consider able amount unsolicited outside aid matter does old adage go An ounce prevention worth pound cure Anyway may wish discuss matter future meeting flying club O&R diary Tim Daniels February issue fine publication Engine Collec torsJournal lists complete index whole Ohlsson Rice lineup engine products very first Ohlsson Mini ature 56 1937 final 049 effort around 1956 complete over 80 pictures associated descriptions different engine versions concepts such famous sideport 23s 60s later front-rotary-valve ver sions post-ignition series glow plug engines Tim credits Ted Enticknap provid ing majority index material July1985145
Edition: Model Aviation - 1985/07
Page Numbers: 52, 53, 54, 141, 144, 145
Author launches 91-in Moth Minor plane looks should terrific performer flight time low 605 just WART program said would programs predictive powers substantiated model won NASA Scale Achievement Award 1983 Nats Author says wouldnt have begun construction numbers hadnt good ptm hg ruru LilirilpitEll warts COMPUTERS chose configuration What Just pick out makes blood sing take plunge Right No right Typical yes right such outbursts passion emerge turkeys defective genes psychotic souls turkeys end days hangar queens hobby room mobiles recognize turkey before build Certainly looks alone anyone smirking looks right will fly right would ask Have seen Don Srulls version Santos Dumont 14 bis Thats pusher canard biplane Don has successfully spanned application range Indoor Rubber Scale full RC anyone thinks oonfiguration looks right suggest quick return gamboling elves fairies gardenand leave striving us appearance what serve guide seek separate turkeys eagles Performance swer poetic descriptions perform ance heroic myths performance owe much chance 45-mm flights 52 Model Aviation listing WART program written M-Basic forthe Kaypro Ii Only slight moditications Basic language syntax should neces saryto makethe program run mostall personal computeraso itcan giveyou powertoseparatethe eaglestrom theturkeys advance everyday meat-and-potatoes perform ance Methods measuring performance fore construction have available years However process proved tedious reduce iron-willed tears arrival friendly com puters picture has change drastically Once right program stored innards computer can check out flight characteristics design few seconds Yes performance stability such esoteric topics big make tail can resolved before reach wax paper An example thing happens large Rubber Scale Im sucker clean lines felt fatal attraction P-39 Ignoring implications curious nickname Iron Dog feverishly built 1m-scale version turned out great turkeys time Despite Wakefield model load rubber 40gm has never cracked 35 sec its long misCerable life Check P-39 printout supplied WART programa Rubber Scale perRubber-powered models oldest types flying models ever built thanks some software written authors wife get assistance newest products market program can used predict flight characteristics save heartbreak spend ing hours constructing model cant made perform up expectations ELeon Bennett July1985 53 formance technique assembled local hacker wife left-most column gives W sum airframe weight rubber weight R final column T yields corresponding duration sec onds look R column interpolate bit between 38 43 estabish 40gm value can see equivalent duration time will roughly 34 sec prediction unfortunately quite accurate known never would have built foul thing takes about 45 sec competitive hereabouts can hope achieve 45 sec upping rubber 60 grams theres simply no place put stuff Yes turkey spotter WART program works well However eagles sensed equal ease Consider Moth Minor printout computer used design aid arriving right combination configuration rubber assure 1-mm flight despite all-up flying weight roughly 22 oz result ing model 91-in span probably worlds biggest Rubber Scale job dealing something far out ordinary experience cannot serve guide computers insistence 128gm rubber 16 strands -in FAI 4 ft long would yield time low 60-sec range would have lacked courage proceed model turned out well won NASA Na tional Assn Scale Aeromodelers Scale Achievement Award 1983 National Contest actual WART program given figure centered Jumbo Scale will handle kind rubber-powered flight after certain amount tinkering see Nitty-Gritty further Written M-Basic Kaypro II program development earlier version written satisfactorily run VIC-20 minor syntax modifica tions requiring elementary familiarity programming can adapted other personal computers print out useful element can just well printer on-screen output sufficient use program must supply following data 1 The wing area square inches 5 2 The airframe weight everything ex cept rubber grams 3 The glide ratio pure number form G Continued page 141 54 Model Aviation THE OR 05 Ai output programs analysis Moth Minor shows flight times excess 1 mm 128 grams rubber suggesting plane indeed eagles Output rom programs analysis OT authors P- turKey witn 40 grams OT rubber planes capacity has no chance reaching flight times competitive 45-sec range knowledge hand before starting construction can save yourself frustration can result building plane Just bcause looks right Authors iron Dog P-3m proved WART just adept finding turkeys confirmed good looks high hopes wont necessarily make good-flying model RC Helicopters/Jolly Continued page 51 line look forward seeing something new Toledo saw several Scale machines static competition no less four Airwolf/Heim 22s very nice Jet Ranger excellent Hind Mil 24d constructed Mike Robbins Toledo always great show year no exception wish would move later year cold weather something else months photos During recent visit OMP able view new prototype Gorham MF-1 target drone machine 10-ft-long range word awesome Intended training aid armed services drone features 22-hp engine weighs 75 pounds fuselage one-fifth scale Mu 24 Hind D typical type operated Soviets As can seen photos MF-l fliesand does very well Im sure wish John well projectand way dont look local hobby shop month also have some pictures personal Airwolf model fea tures own fiberglass fuselage Heim retracts GMP Competitor mechanics rotorhead prototype flybarless design GMP engine OS 60 FSR-H has proved excel lent power li-lb machine particular model has approximately 40 hours failures speaks well components used off-the-shelf items months three-view large Soviet military helicopter design Mil 24 goes back late Sixties United States already realizing potential armed military machine Indeed era Bell came up successful Cobra design Soviets took little longer get gunship service Hind D has proved capable dealing machines Mil 24 very large 56 ft length also very fast Hind cruises 175 mph range holds two world speed records its class Because Hind features articulated rotorhead nimble its US counterparts can however transport squad eight troops scene battle offer standoff protection well definite tankbusting capabilities no wonder NATO concerned rapid develop ment deployment formidable weapon no kit Hind D however have one-twelth scale fuselage available youre planning conquest western Europe BCNU Lariy Jolly 5501 W Como Santa Ana CA 92703 WART Program/Bennett Continued page 54 wing area taken straight plans consider portion wing either passing through fuselage blanketed fuselage high wing Count area sticking out breeze area given square feet multiply 144 convert square inches airframe weight includes absolutely everything carried aloft exception rubber convert ounces grams multiply 29 Usually given plans accompanying article can worked out see Nitty-Gritty glide ratio consists distance traveled horizontally foot verti cal drop Imagine test-gliding finished well-trimmed model height 6 ft launch perfect model travels say 18 ft horizontally fore hits ground G 18/6 3 G value reflects two separate qualities lift drag airfoils speeds trim settings us employ lift coefficient pretty close 10 However drag can vary over wide range depending cleanliness configuration also models size models Jumbo Scale size range list configurations cor responding G values given G Table have worked out either using drag coefficient ooncepts have set in-flight observations use table search among configu rations until find something cor responds cleanliness model pick out proper G factor Also see Nitty-Gritty additional G advice Rubber weight R need known point virtues WART program presents automatically wide range rubber motors everything light motor trimming purposes all-out heavyweight motor contest work program assumes possible range rubber weight values between limits 7% 33% have choice concerns increments ofRthat examined queried What step R should enter 5 R values used computation will 5gm apart find best way use feature home-in final answer choosing progressively finer increments design becomes seriously considered choose too fine increment early stages design tends produce avalanche data difficult handle table generated running pro gram supplies estimated duration motor possibility sense can simply choose printout motorduration combination like catch program assumes rubber being used effectively worrying Continued page 144 DGA DESIGNS /0 Full Body Pilot Kit eLightest Pilot available Lifeiike vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions Fuliy positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2 oz$ 795 lI4Scale4oz$ 995 1/3ScaieSoz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6 Scale 75 oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 sLightest bust pilot available sLifelike vinyl latex rubber parts sEasy assemble finish eBuild either barnstormer sportsman pilot skit contains pilot head helmet cap goggles jacket instructions See deaier order direct Add $100 shipping direct orders Send $100 current cataiog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-No COD 5 3 NION PNRFORMANCE 0*50 LAUNeNEE CLINERS ENOM CIGNYWEIGOT ALUMINUM NEVERACE CANS Two FULL SIZE PATTERNS TOOK CUOICELLOSTNATEE *ONITIONAL PATTEENN NION tACO ON Sb PACE PICE EBb SOUTOE*STENN P0 NONO tOOLErOB. oENB July1985 141 1j~MAGIC MAGNET BWLDERW ByEIdonJ Lind Co 2912 Walker Lee Los Alamitos CA 90720 about short noses balancing difficulties matching prop motor reasons must have some notion just much rubber practical configuration prop under study Some times plans will give rubber weight available might use R20% reasonable working figure Check Nitty-Gritty advice Drawbacks OK whats wrong Will future contests consist fliers hunched over consoles type entries Fear process has merit also has drawbacks greatest lack precision process works well turkey spotter Ditto eagle identification ever comes distinguishing good eagles better eagles hopeless tur keys more-hopeless turkeys system falters Introducing. #irebai1 RIC Idle-Bar Glow Plugs Also.Long Short$1 69 Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $129 SwansonAssociates PO Box 151 Wayne NJS,n 7948 07470 basic difficulty imprecise input concerns input operator bring computer also input stored within program example program assumes prop efficiency 50% evidence substantiate figure lower end tested Wakefield prop-efficiency numbers highly probable good Rubber Scale props 50% range However either prop-carving whiz dub might somewhat better considerably worse 50% As move away 50% predictive power program weakens input factors sort have built programranging type rubber mode flight short program works best adhere standard practices aspect mod eling As standard practices departed program becomes increasingly inaccurate second drawback computer makes no comment practical aspects design Weve already noted New completely automatic malr..., system wet galled cells No run-down batteries xplosive gasses generated undercharged inter storage problems No boiled-dry batteries tteotiox required-electronically overcharged maintains toll charge No e axxc pou a, JUST CONNECT ITTHEN FORGET IT 0005 on Mdspecify Bar 12 volt PO Box 221 $4995~araCanton SD 57013 Proacts 5A 987-5024 $250 S&H E information connection rubber weight other practical considerations ignoredeverything whether model will stay right-side-up field worthiness thermal sensitivity ROG capability tree slitherness work ing Nitty-Gritty following assumptions built program model powered rubber capable storing 2800 ft-lb energy per unit weight wound 75% max turns Hysteresis loss reduces energy returned 60% max poten tial Prop efficiency 50% mode flight slow cruise Available energy deduced rubber weight above efficiency factors expended work due drag Once energy consumed flight over other words flight mode described does consider climb glide effects upon duration sup port 1975 NFFS Sympo view rather modest climb rates subse quent glides typical Rubber Scale flight have little effect overall duration Given dead air would about well expending rubber energy steady cruising Wing area S top plan-view area wanted Given mild amount dihedral error involved ignoring dihedral effects small However considering wings exaggerated polyhedral will necessary reduce wing area horizontal projected area Airframe weight calculate work up total volume balsa cubic inches multiply two get weight grams average-density 8-lb balsa Add 20% weight glue Tissue weighs 1gm per 90 sq Music wire 1/16 weighs 5gm per lineal foot Glide ratio G Values given table based Reynolds numbers 100000 range scale corresponding large Jumbo Scale model assumed wing Clark Y section flying 20% less maximum lift coefficient Most listed drag values computed 144 Model Aviation An Ideal way build balsa construc ted model airplane wings fuselage stabilizers elevators rudders Build fast easy straight true Makes other methods obsolete CONTENTS 1 -16x48 STEEL PLATE 30- MAGNETS 60- MAGNETIC POLES 10-5 UPRIGHTS 10- 1 x 10/32 BOLTS 10-10/32 NUTS useful tool will last lifetime nothing wear out Magnetically holds balsa parts place glulng No damaged split weakened wood using pins WART Program/Bennett Continued page 141 nem Oxuier oroer xirecs AdO 5200 snipping avG handlingPO Box 05 Champaign IL 61020 classic expressions taken Schlichting Boundary Layer Theory McGraw Hill quick-and-dirty rule-of-thumb Jumbo Scale try following really clean go 5 average drag go 4 fairly draggy outsize fliselage cross section lots struts go 3 Rubber R maximum length rubber motor can effectively stored used bunching balance problems about three times distance prop hook center gravity CG Rubber weighs roughly 2gm per lineal foot -in FAI 16gm per foot -in Sig flying all-out perform ance event turns approaching max used ratherthan assumed 75% contained program can alter formula reflect increased energy level Duration directly proportional stored energy store 10% energy given weight rubber specffied program will extend duration 10% future go Will computer-assisted design wipe out turkeys leaving nothing eagles sky will computer prove monster destroying fun aspect mod eling reducing game bunch number crunching Its too early tell few programs have available today wont really change game time can expect programs everything prop design rib spacing As computer assumes every-growing role some whittler types may throw down razor blades leave Others will face reality study computing Yes difficult life-style deci tions will have made us concerning computer think married hacker Address questions and/or bitter zomplaints either Leon Bennett mod ler and/or Rachelle Bennett hacker 6 Rivercrest Rd Bronx NY 10471 replies please include SASE FF Duration/Murphy Continued page 57 length time As engine rpms increase dangers multiply some clubs have already taken strides endorse outlawing use wood props non-reinforced plastic props high-performance engines continuous-filament fiber glass/epoxy resin concepts appear put up best defense preventing associat ed mishaps Carbon fiber fiberglassreinforced plastic props obviously quite expensive since produced cottage industry present relatively inexpensive com pared price someones eye worse sooner commercially svailable reinforced concepts hit marSignal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $9795 check money order TTBT~ II u ox 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranty cted dealerships available ketplace safer flying field will new ultra-high-rpm ducted fan powerplants already beginning replace traditional Schneurle main stays thus causing greater safety concerns Appropriately-reinforced epoxy propellers definite requirement engines Maybe will need mal approval procedure prop manu facturers before long similar Underwriters Laboratories service electrical industry rate begin police problem ourselves could very possibly receive consider able amount unsolicited outside aid matter does old adage go An ounce prevention worth pound cure Anyway may wish discuss matter future meeting flying club O&R diary Tim Daniels February issue fine publication Engine Collec torsJournal lists complete index whole Ohlsson Rice lineup engine products very first Ohlsson Mini ature 56 1937 final 049 effort around 1956 complete over 80 pictures associated descriptions different engine versions concepts such famous sideport 23s 60s later front-rotary-valve ver sions post-ignition series glow plug engines Tim credits Ted Enticknap provid ing majority index material July1985145
Edition: Model Aviation - 1985/07
Page Numbers: 52, 53, 54, 141, 144, 145
Author launches 91-in Moth Minor plane looks should terrific performer flight time low 605 just WART program said would programs predictive powers substantiated model won NASA Scale Achievement Award 1983 Nats Author says wouldnt have begun construction numbers hadnt good ptm hg ruru LilirilpitEll warts COMPUTERS chose configuration What Just pick out makes blood sing take plunge Right No right Typical yes right such outbursts passion emerge turkeys defective genes psychotic souls turkeys end days hangar queens hobby room mobiles recognize turkey before build Certainly looks alone anyone smirking looks right will fly right would ask Have seen Don Srulls version Santos Dumont 14 bis Thats pusher canard biplane Don has successfully spanned application range Indoor Rubber Scale full RC anyone thinks oonfiguration looks right suggest quick return gamboling elves fairies gardenand leave striving us appearance what serve guide seek separate turkeys eagles Performance swer poetic descriptions perform ance heroic myths performance owe much chance 45-mm flights 52 Model Aviation listing WART program written M-Basic forthe Kaypro Ii Only slight moditications Basic language syntax should neces saryto makethe program run mostall personal computeraso itcan giveyou powertoseparatethe eaglestrom theturkeys advance everyday meat-and-potatoes perform ance Methods measuring performance fore construction have available years However process proved tedious reduce iron-willed tears arrival friendly com puters picture has change drastically Once right program stored innards computer can check out flight characteristics design few seconds Yes performance stability such esoteric topics big make tail can resolved before reach wax paper An example thing happens large Rubber Scale Im sucker clean lines felt fatal attraction P-39 Ignoring implications curious nickname Iron Dog feverishly built 1m-scale version turned out great turkeys time Despite Wakefield model load rubber 40gm has never cracked 35 sec its long misCerable life Check P-39 printout supplied WART programa Rubber Scale perRubber-powered models oldest types flying models ever built thanks some software written authors wife get assistance newest products market program can used predict flight characteristics save heartbreak spend ing hours constructing model cant made perform up expectations ELeon Bennett July1985 53 formance technique assembled local hacker wife left-most column gives W sum airframe weight rubber weight R final column T yields corresponding duration sec onds look R column interpolate bit between 38 43 estabish 40gm value can see equivalent duration time will roughly 34 sec prediction unfortunately quite accurate known never would have built foul thing takes about 45 sec competitive hereabouts can hope achieve 45 sec upping rubber 60 grams theres simply no place put stuff Yes turkey spotter WART program works well However eagles sensed equal ease Consider Moth Minor printout computer used design aid arriving right combination configuration rubber assure 1-mm flight despite all-up flying weight roughly 22 oz result ing model 91-in span probably worlds biggest Rubber Scale job dealing something far out ordinary experience cannot serve guide computers insistence 128gm rubber 16 strands -in FAI 4 ft long would yield time low 60-sec range would have lacked courage proceed model turned out well won NASA Na tional Assn Scale Aeromodelers Scale Achievement Award 1983 National Contest actual WART program given figure centered Jumbo Scale will handle kind rubber-powered flight after certain amount tinkering see Nitty-Gritty further Written M-Basic Kaypro II program development earlier version written satisfactorily run VIC-20 minor syntax modifica tions requiring elementary familiarity programming can adapted other personal computers print out useful element can just well printer on-screen output sufficient use program must supply following data 1 The wing area square inches 5 2 The airframe weight everything ex cept rubber grams 3 The glide ratio pure number form G Continued page 141 54 Model Aviation THE OR 05 Ai output programs analysis Moth Minor shows flight times excess 1 mm 128 grams rubber suggesting plane indeed eagles Output rom programs analysis OT authors P- turKey witn 40 grams OT rubber planes capacity has no chance reaching flight times competitive 45-sec range knowledge hand before starting construction can save yourself frustration can result building plane Just bcause looks right Authors iron Dog P-3m proved WART just adept finding turkeys confirmed good looks high hopes wont necessarily make good-flying model RC Helicopters/Jolly Continued page 51 line look forward seeing something new Toledo saw several Scale machines static competition no less four Airwolf/Heim 22s very nice Jet Ranger excellent Hind Mil 24d constructed Mike Robbins Toledo always great show year no exception wish would move later year cold weather something else months photos During recent visit OMP able view new prototype Gorham MF-1 target drone machine 10-ft-long range word awesome Intended training aid armed services drone features 22-hp engine weighs 75 pounds fuselage one-fifth scale Mu 24 Hind D typical type operated Soviets As can seen photos MF-l fliesand does very well Im sure wish John well projectand way dont look local hobby shop month also have some pictures personal Airwolf model fea tures own fiberglass fuselage Heim retracts GMP Competitor mechanics rotorhead prototype flybarless design GMP engine OS 60 FSR-H has proved excel lent power li-lb machine particular model has approximately 40 hours failures speaks well components used off-the-shelf items months three-view large Soviet military helicopter design Mil 24 goes back late Sixties United States already realizing potential armed military machine Indeed era Bell came up successful Cobra design Soviets took little longer get gunship service Hind D has proved capable dealing machines Mil 24 very large 56 ft length also very fast Hind cruises 175 mph range holds two world speed records its class Because Hind features articulated rotorhead nimble its US counterparts can however transport squad eight troops scene battle offer standoff protection well definite tankbusting capabilities no wonder NATO concerned rapid develop ment deployment formidable weapon no kit Hind D however have one-twelth scale fuselage available youre planning conquest western Europe BCNU Lariy Jolly 5501 W Como Santa Ana CA 92703 WART Program/Bennett Continued page 54 wing area taken straight plans consider portion wing either passing through fuselage blanketed fuselage high wing Count area sticking out breeze area given square feet multiply 144 convert square inches airframe weight includes absolutely everything carried aloft exception rubber convert ounces grams multiply 29 Usually given plans accompanying article can worked out see Nitty-Gritty glide ratio consists distance traveled horizontally foot verti cal drop Imagine test-gliding finished well-trimmed model height 6 ft launch perfect model travels say 18 ft horizontally fore hits ground G 18/6 3 G value reflects two separate qualities lift drag airfoils speeds trim settings us employ lift coefficient pretty close 10 However drag can vary over wide range depending cleanliness configuration also models size models Jumbo Scale size range list configurations cor responding G values given G Table have worked out either using drag coefficient ooncepts have set in-flight observations use table search among configu rations until find something cor responds cleanliness model pick out proper G factor Also see Nitty-Gritty additional G advice Rubber weight R need known point virtues WART program presents automatically wide range rubber motors everything light motor trimming purposes all-out heavyweight motor contest work program assumes possible range rubber weight values between limits 7% 33% have choice concerns increments ofRthat examined queried What step R should enter 5 R values used computation will 5gm apart find best way use feature home-in final answer choosing progressively finer increments design becomes seriously considered choose too fine increment early stages design tends produce avalanche data difficult handle table generated running pro gram supplies estimated duration motor possibility sense can simply choose printout motorduration combination like catch program assumes rubber being used effectively worrying Continued page 144 DGA DESIGNS /0 Full Body Pilot Kit eLightest Pilot available Lifeiike vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions Fuliy positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2 oz$ 795 lI4Scale4oz$ 995 1/3ScaieSoz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6 Scale 75 oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 sLightest bust pilot available sLifelike vinyl latex rubber parts sEasy assemble finish eBuild either barnstormer sportsman pilot skit contains pilot head helmet cap goggles jacket instructions See deaier order direct Add $100 shipping direct orders Send $100 current cataiog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-No COD 5 3 NION PNRFORMANCE 0*50 LAUNeNEE CLINERS ENOM CIGNYWEIGOT ALUMINUM NEVERACE CANS Two FULL SIZE PATTERNS TOOK CUOICELLOSTNATEE *ONITIONAL PATTEENN NION tACO ON Sb PACE PICE EBb SOUTOE*STENN P0 NONO tOOLErOB. oENB July1985 141 1j~MAGIC MAGNET BWLDERW ByEIdonJ Lind Co 2912 Walker Lee Los Alamitos CA 90720 about short noses balancing difficulties matching prop motor reasons must have some notion just much rubber practical configuration prop under study Some times plans will give rubber weight available might use R20% reasonable working figure Check Nitty-Gritty advice Drawbacks OK whats wrong Will future contests consist fliers hunched over consoles type entries Fear process has merit also has drawbacks greatest lack precision process works well turkey spotter Ditto eagle identification ever comes distinguishing good eagles better eagles hopeless tur keys more-hopeless turkeys system falters Introducing. #irebai1 RIC Idle-Bar Glow Plugs Also.Long Short$1 69 Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $129 SwansonAssociates PO Box 151 Wayne NJS,n 7948 07470 basic difficulty imprecise input concerns input operator bring computer also input stored within program example program assumes prop efficiency 50% evidence substantiate figure lower end tested Wakefield prop-efficiency numbers highly probable good Rubber Scale props 50% range However either prop-carving whiz dub might somewhat better considerably worse 50% As move away 50% predictive power program weakens input factors sort have built programranging type rubber mode flight short program works best adhere standard practices aspect mod eling As standard practices departed program becomes increasingly inaccurate second drawback computer makes no comment practical aspects design Weve already noted New completely automatic malr..., system wet galled cells No run-down batteries xplosive gasses generated undercharged inter storage problems No boiled-dry batteries tteotiox required-electronically overcharged maintains toll charge No e axxc pou a, JUST CONNECT ITTHEN FORGET IT 0005 on Mdspecify Bar 12 volt PO Box 221 $4995~araCanton SD 57013 Proacts 5A 987-5024 $250 S&H E information connection rubber weight other practical considerations ignoredeverything whether model will stay right-side-up field worthiness thermal sensitivity ROG capability tree slitherness work ing Nitty-Gritty following assumptions built program model powered rubber capable storing 2800 ft-lb energy per unit weight wound 75% max turns Hysteresis loss reduces energy returned 60% max poten tial Prop efficiency 50% mode flight slow cruise Available energy deduced rubber weight above efficiency factors expended work due drag Once energy consumed flight over other words flight mode described does consider climb glide effects upon duration sup port 1975 NFFS Sympo view rather modest climb rates subse quent glides typical Rubber Scale flight have little effect overall duration Given dead air would about well expending rubber energy steady cruising Wing area S top plan-view area wanted Given mild amount dihedral error involved ignoring dihedral effects small However considering wings exaggerated polyhedral will necessary reduce wing area horizontal projected area Airframe weight calculate work up total volume balsa cubic inches multiply two get weight grams average-density 8-lb balsa Add 20% weight glue Tissue weighs 1gm per 90 sq Music wire 1/16 weighs 5gm per lineal foot Glide ratio G Values given table based Reynolds numbers 100000 range scale corresponding large Jumbo Scale model assumed wing Clark Y section flying 20% less maximum lift coefficient Most listed drag values computed 144 Model Aviation An Ideal way build balsa construc ted model airplane wings fuselage stabilizers elevators rudders Build fast easy straight true Makes other methods obsolete CONTENTS 1 -16x48 STEEL PLATE 30- MAGNETS 60- MAGNETIC POLES 10-5 UPRIGHTS 10- 1 x 10/32 BOLTS 10-10/32 NUTS useful tool will last lifetime nothing wear out Magnetically holds balsa parts place glulng No damaged split weakened wood using pins WART Program/Bennett Continued page 141 nem Oxuier oroer xirecs AdO 5200 snipping avG handlingPO Box 05 Champaign IL 61020 classic expressions taken Schlichting Boundary Layer Theory McGraw Hill quick-and-dirty rule-of-thumb Jumbo Scale try following really clean go 5 average drag go 4 fairly draggy outsize fliselage cross section lots struts go 3 Rubber R maximum length rubber motor can effectively stored used bunching balance problems about three times distance prop hook center gravity CG Rubber weighs roughly 2gm per lineal foot -in FAI 16gm per foot -in Sig flying all-out perform ance event turns approaching max used ratherthan assumed 75% contained program can alter formula reflect increased energy level Duration directly proportional stored energy store 10% energy given weight rubber specffied program will extend duration 10% future go Will computer-assisted design wipe out turkeys leaving nothing eagles sky will computer prove monster destroying fun aspect mod eling reducing game bunch number crunching Its too early tell few programs have available today wont really change game time can expect programs everything prop design rib spacing As computer assumes every-growing role some whittler types may throw down razor blades leave Others will face reality study computing Yes difficult life-style deci tions will have made us concerning computer think married hacker Address questions and/or bitter zomplaints either Leon Bennett mod ler and/or Rachelle Bennett hacker 6 Rivercrest Rd Bronx NY 10471 replies please include SASE FF Duration/Murphy Continued page 57 length time As engine rpms increase dangers multiply some clubs have already taken strides endorse outlawing use wood props non-reinforced plastic props high-performance engines continuous-filament fiber glass/epoxy resin concepts appear put up best defense preventing associat ed mishaps Carbon fiber fiberglassreinforced plastic props obviously quite expensive since produced cottage industry present relatively inexpensive com pared price someones eye worse sooner commercially svailable reinforced concepts hit marSignal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $9795 check money order TTBT~ II u ox 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranty cted dealerships available ketplace safer flying field will new ultra-high-rpm ducted fan powerplants already beginning replace traditional Schneurle main stays thus causing greater safety concerns Appropriately-reinforced epoxy propellers definite requirement engines Maybe will need mal approval procedure prop manu facturers before long similar Underwriters Laboratories service electrical industry rate begin police problem ourselves could very possibly receive consider able amount unsolicited outside aid matter does old adage go An ounce prevention worth pound cure Anyway may wish discuss matter future meeting flying club O&R diary Tim Daniels February issue fine publication Engine Collec torsJournal lists complete index whole Ohlsson Rice lineup engine products very first Ohlsson Mini ature 56 1937 final 049 effort around 1956 complete over 80 pictures associated descriptions different engine versions concepts such famous sideport 23s 60s later front-rotary-valve ver sions post-ignition series glow plug engines Tim credits Ted Enticknap provid ing majority index material July1985145
Edition: Model Aviation - 1985/07
Page Numbers: 52, 53, 54, 141, 144, 145
Author launches 91-in Moth Minor plane looks should terrific performer flight time low 605 just WART program said would programs predictive powers substantiated model won NASA Scale Achievement Award 1983 Nats Author says wouldnt have begun construction numbers hadnt good ptm hg ruru LilirilpitEll warts COMPUTERS chose configuration What Just pick out makes blood sing take plunge Right No right Typical yes right such outbursts passion emerge turkeys defective genes psychotic souls turkeys end days hangar queens hobby room mobiles recognize turkey before build Certainly looks alone anyone smirking looks right will fly right would ask Have seen Don Srulls version Santos Dumont 14 bis Thats pusher canard biplane Don has successfully spanned application range Indoor Rubber Scale full RC anyone thinks oonfiguration looks right suggest quick return gamboling elves fairies gardenand leave striving us appearance what serve guide seek separate turkeys eagles Performance swer poetic descriptions perform ance heroic myths performance owe much chance 45-mm flights 52 Model Aviation listing WART program written M-Basic forthe Kaypro Ii Only slight moditications Basic language syntax should neces saryto makethe program run mostall personal computeraso itcan giveyou powertoseparatethe eaglestrom theturkeys advance everyday meat-and-potatoes perform ance Methods measuring performance fore construction have available years However process proved tedious reduce iron-willed tears arrival friendly com puters picture has change drastically Once right program stored innards computer can check out flight characteristics design few seconds Yes performance stability such esoteric topics big make tail can resolved before reach wax paper An example thing happens large Rubber Scale Im sucker clean lines felt fatal attraction P-39 Ignoring implications curious nickname Iron Dog feverishly built 1m-scale version turned out great turkeys time Despite Wakefield model load rubber 40gm has never cracked 35 sec its long misCerable life Check P-39 printout supplied WART programa Rubber Scale perRubber-powered models oldest types flying models ever built thanks some software written authors wife get assistance newest products market program can used predict flight characteristics save heartbreak spend ing hours constructing model cant made perform up expectations ELeon Bennett July1985 53 formance technique assembled local hacker wife left-most column gives W sum airframe weight rubber weight R final column T yields corresponding duration sec onds look R column interpolate bit between 38 43 estabish 40gm value can see equivalent duration time will roughly 34 sec prediction unfortunately quite accurate known never would have built foul thing takes about 45 sec competitive hereabouts can hope achieve 45 sec upping rubber 60 grams theres simply no place put stuff Yes turkey spotter WART program works well However eagles sensed equal ease Consider Moth Minor printout computer used design aid arriving right combination configuration rubber assure 1-mm flight despite all-up flying weight roughly 22 oz result ing model 91-in span probably worlds biggest Rubber Scale job dealing something far out ordinary experience cannot serve guide computers insistence 128gm rubber 16 strands -in FAI 4 ft long would yield time low 60-sec range would have lacked courage proceed model turned out well won NASA Na tional Assn Scale Aeromodelers Scale Achievement Award 1983 National Contest actual WART program given figure centered Jumbo Scale will handle kind rubber-powered flight after certain amount tinkering see Nitty-Gritty further Written M-Basic Kaypro II program development earlier version written satisfactorily run VIC-20 minor syntax modifica tions requiring elementary familiarity programming can adapted other personal computers print out useful element can just well printer on-screen output sufficient use program must supply following data 1 The wing area square inches 5 2 The airframe weight everything ex cept rubber grams 3 The glide ratio pure number form G Continued page 141 54 Model Aviation THE OR 05 Ai output programs analysis Moth Minor shows flight times excess 1 mm 128 grams rubber suggesting plane indeed eagles Output rom programs analysis OT authors P- turKey witn 40 grams OT rubber planes capacity has no chance reaching flight times competitive 45-sec range knowledge hand before starting construction can save yourself frustration can result building plane Just bcause looks right Authors iron Dog P-3m proved WART just adept finding turkeys confirmed good looks high hopes wont necessarily make good-flying model RC Helicopters/Jolly Continued page 51 line look forward seeing something new Toledo saw several Scale machines static competition no less four Airwolf/Heim 22s very nice Jet Ranger excellent Hind Mil 24d constructed Mike Robbins Toledo always great show year no exception wish would move later year cold weather something else months photos During recent visit OMP able view new prototype Gorham MF-1 target drone machine 10-ft-long range word awesome Intended training aid armed services drone features 22-hp engine weighs 75 pounds fuselage one-fifth scale Mu 24 Hind D typical type operated Soviets As can seen photos MF-l fliesand does very well Im sure wish John well projectand way dont look local hobby shop month also have some pictures personal Airwolf model fea tures own fiberglass fuselage Heim retracts GMP Competitor mechanics rotorhead prototype flybarless design GMP engine OS 60 FSR-H has proved excel lent power li-lb machine particular model has approximately 40 hours failures speaks well components used off-the-shelf items months three-view large Soviet military helicopter design Mil 24 goes back late Sixties United States already realizing potential armed military machine Indeed era Bell came up successful Cobra design Soviets took little longer get gunship service Hind D has proved capable dealing machines Mil 24 very large 56 ft length also very fast Hind cruises 175 mph range holds two world speed records its class Because Hind features articulated rotorhead nimble its US counterparts can however transport squad eight troops scene battle offer standoff protection well definite tankbusting capabilities no wonder NATO concerned rapid develop ment deployment formidable weapon no kit Hind D however have one-twelth scale fuselage available youre planning conquest western Europe BCNU Lariy Jolly 5501 W Como Santa Ana CA 92703 WART Program/Bennett Continued page 54 wing area taken straight plans consider portion wing either passing through fuselage blanketed fuselage high wing Count area sticking out breeze area given square feet multiply 144 convert square inches airframe weight includes absolutely everything carried aloft exception rubber convert ounces grams multiply 29 Usually given plans accompanying article can worked out see Nitty-Gritty glide ratio consists distance traveled horizontally foot verti cal drop Imagine test-gliding finished well-trimmed model height 6 ft launch perfect model travels say 18 ft horizontally fore hits ground G 18/6 3 G value reflects two separate qualities lift drag airfoils speeds trim settings us employ lift coefficient pretty close 10 However drag can vary over wide range depending cleanliness configuration also models size models Jumbo Scale size range list configurations cor responding G values given G Table have worked out either using drag coefficient ooncepts have set in-flight observations use table search among configu rations until find something cor responds cleanliness model pick out proper G factor Also see Nitty-Gritty additional G advice Rubber weight R need known point virtues WART program presents automatically wide range rubber motors everything light motor trimming purposes all-out heavyweight motor contest work program assumes possible range rubber weight values between limits 7% 33% have choice concerns increments ofRthat examined queried What step R should enter 5 R values used computation will 5gm apart find best way use feature home-in final answer choosing progressively finer increments design becomes seriously considered choose too fine increment early stages design tends produce avalanche data difficult handle table generated running pro gram supplies estimated duration motor possibility sense can simply choose printout motorduration combination like catch program assumes rubber being used effectively worrying Continued page 144 DGA DESIGNS /0 Full Body Pilot Kit eLightest Pilot available Lifeiike vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions Fuliy positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2 oz$ 795 lI4Scale4oz$ 995 1/3ScaieSoz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6 Scale 75 oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 sLightest bust pilot available sLifelike vinyl latex rubber parts sEasy assemble finish eBuild either barnstormer sportsman pilot skit contains pilot head helmet cap goggles jacket instructions See deaier order direct Add $100 shipping direct orders Send $100 current cataiog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-No COD 5 3 NION PNRFORMANCE 0*50 LAUNeNEE CLINERS ENOM CIGNYWEIGOT ALUMINUM NEVERACE CANS Two FULL SIZE PATTERNS TOOK CUOICELLOSTNATEE *ONITIONAL PATTEENN NION tACO ON Sb PACE PICE EBb SOUTOE*STENN P0 NONO tOOLErOB. oENB July1985 141 1j~MAGIC MAGNET BWLDERW ByEIdonJ Lind Co 2912 Walker Lee Los Alamitos CA 90720 about short noses balancing difficulties matching prop motor reasons must have some notion just much rubber practical configuration prop under study Some times plans will give rubber weight available might use R20% reasonable working figure Check Nitty-Gritty advice Drawbacks OK whats wrong Will future contests consist fliers hunched over consoles type entries Fear process has merit also has drawbacks greatest lack precision process works well turkey spotter Ditto eagle identification ever comes distinguishing good eagles better eagles hopeless tur keys more-hopeless turkeys system falters Introducing. #irebai1 RIC Idle-Bar Glow Plugs Also.Long Short$1 69 Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $129 SwansonAssociates PO Box 151 Wayne NJS,n 7948 07470 basic difficulty imprecise input concerns input operator bring computer also input stored within program example program assumes prop efficiency 50% evidence substantiate figure lower end tested Wakefield prop-efficiency numbers highly probable good Rubber Scale props 50% range However either prop-carving whiz dub might somewhat better considerably worse 50% As move away 50% predictive power program weakens input factors sort have built programranging type rubber mode flight short program works best adhere standard practices aspect mod eling As standard practices departed program becomes increasingly inaccurate second drawback computer makes no comment practical aspects design Weve already noted New completely automatic malr..., system wet galled cells No run-down batteries xplosive gasses generated undercharged inter storage problems No boiled-dry batteries tteotiox required-electronically overcharged maintains toll charge No e axxc pou a, JUST CONNECT ITTHEN FORGET IT 0005 on Mdspecify Bar 12 volt PO Box 221 $4995~araCanton SD 57013 Proacts 5A 987-5024 $250 S&H E information connection rubber weight other practical considerations ignoredeverything whether model will stay right-side-up field worthiness thermal sensitivity ROG capability tree slitherness work ing Nitty-Gritty following assumptions built program model powered rubber capable storing 2800 ft-lb energy per unit weight wound 75% max turns Hysteresis loss reduces energy returned 60% max poten tial Prop efficiency 50% mode flight slow cruise Available energy deduced rubber weight above efficiency factors expended work due drag Once energy consumed flight over other words flight mode described does consider climb glide effects upon duration sup port 1975 NFFS Sympo view rather modest climb rates subse quent glides typical Rubber Scale flight have little effect overall duration Given dead air would about well expending rubber energy steady cruising Wing area S top plan-view area wanted Given mild amount dihedral error involved ignoring dihedral effects small However considering wings exaggerated polyhedral will necessary reduce wing area horizontal projected area Airframe weight calculate work up total volume balsa cubic inches multiply two get weight grams average-density 8-lb balsa Add 20% weight glue Tissue weighs 1gm per 90 sq Music wire 1/16 weighs 5gm per lineal foot Glide ratio G Values given table based Reynolds numbers 100000 range scale corresponding large Jumbo Scale model assumed wing Clark Y section flying 20% less maximum lift coefficient Most listed drag values computed 144 Model Aviation An Ideal way build balsa construc ted model airplane wings fuselage stabilizers elevators rudders Build fast easy straight true Makes other methods obsolete CONTENTS 1 -16x48 STEEL PLATE 30- MAGNETS 60- MAGNETIC POLES 10-5 UPRIGHTS 10- 1 x 10/32 BOLTS 10-10/32 NUTS useful tool will last lifetime nothing wear out Magnetically holds balsa parts place glulng No damaged split weakened wood using pins WART Program/Bennett Continued page 141 nem Oxuier oroer xirecs AdO 5200 snipping avG handlingPO Box 05 Champaign IL 61020 classic expressions taken Schlichting Boundary Layer Theory McGraw Hill quick-and-dirty rule-of-thumb Jumbo Scale try following really clean go 5 average drag go 4 fairly draggy outsize fliselage cross section lots struts go 3 Rubber R maximum length rubber motor can effectively stored used bunching balance problems about three times distance prop hook center gravity CG Rubber weighs roughly 2gm per lineal foot -in FAI 16gm per foot -in Sig flying all-out perform ance event turns approaching max used ratherthan assumed 75% contained program can alter formula reflect increased energy level Duration directly proportional stored energy store 10% energy given weight rubber specffied program will extend duration 10% future go Will computer-assisted design wipe out turkeys leaving nothing eagles sky will computer prove monster destroying fun aspect mod eling reducing game bunch number crunching Its too early tell few programs have available today wont really change game time can expect programs everything prop design rib spacing As computer assumes every-growing role some whittler types may throw down razor blades leave Others will face reality study computing Yes difficult life-style deci tions will have made us concerning computer think married hacker Address questions and/or bitter zomplaints either Leon Bennett mod ler and/or Rachelle Bennett hacker 6 Rivercrest Rd Bronx NY 10471 replies please include SASE FF Duration/Murphy Continued page 57 length time As engine rpms increase dangers multiply some clubs have already taken strides endorse outlawing use wood props non-reinforced plastic props high-performance engines continuous-filament fiber glass/epoxy resin concepts appear put up best defense preventing associat ed mishaps Carbon fiber fiberglassreinforced plastic props obviously quite expensive since produced cottage industry present relatively inexpensive com pared price someones eye worse sooner commercially svailable reinforced concepts hit marSignal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $9795 check money order TTBT~ II u ox 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranty cted dealerships available ketplace safer flying field will new ultra-high-rpm ducted fan powerplants already beginning replace traditional Schneurle main stays thus causing greater safety concerns Appropriately-reinforced epoxy propellers definite requirement engines Maybe will need mal approval procedure prop manu facturers before long similar Underwriters Laboratories service electrical industry rate begin police problem ourselves could very possibly receive consider able amount unsolicited outside aid matter does old adage go An ounce prevention worth pound cure Anyway may wish discuss matter future meeting flying club O&R diary Tim Daniels February issue fine publication Engine Collec torsJournal lists complete index whole Ohlsson Rice lineup engine products very first Ohlsson Mini ature 56 1937 final 049 effort around 1956 complete over 80 pictures associated descriptions different engine versions concepts such famous sideport 23s 60s later front-rotary-valve ver sions post-ignition series glow plug engines Tim credits Ted Enticknap provid ing majority index material July1985145
Edition: Model Aviation - 1985/07
Page Numbers: 52, 53, 54, 141, 144, 145
Author launches 91-in Moth Minor plane looks should terrific performer flight time low 605 just WART program said would programs predictive powers substantiated model won NASA Scale Achievement Award 1983 Nats Author says wouldnt have begun construction numbers hadnt good ptm hg ruru LilirilpitEll warts COMPUTERS chose configuration What Just pick out makes blood sing take plunge Right No right Typical yes right such outbursts passion emerge turkeys defective genes psychotic souls turkeys end days hangar queens hobby room mobiles recognize turkey before build Certainly looks alone anyone smirking looks right will fly right would ask Have seen Don Srulls version Santos Dumont 14 bis Thats pusher canard biplane Don has successfully spanned application range Indoor Rubber Scale full RC anyone thinks oonfiguration looks right suggest quick return gamboling elves fairies gardenand leave striving us appearance what serve guide seek separate turkeys eagles Performance swer poetic descriptions perform ance heroic myths performance owe much chance 45-mm flights 52 Model Aviation listing WART program written M-Basic forthe Kaypro Ii Only slight moditications Basic language syntax should neces saryto makethe program run mostall personal computeraso itcan giveyou powertoseparatethe eaglestrom theturkeys advance everyday meat-and-potatoes perform ance Methods measuring performance fore construction have available years However process proved tedious reduce iron-willed tears arrival friendly com puters picture has change drastically Once right program stored innards computer can check out flight characteristics design few seconds Yes performance stability such esoteric topics big make tail can resolved before reach wax paper An example thing happens large Rubber Scale Im sucker clean lines felt fatal attraction P-39 Ignoring implications curious nickname Iron Dog feverishly built 1m-scale version turned out great turkeys time Despite Wakefield model load rubber 40gm has never cracked 35 sec its long misCerable life Check P-39 printout supplied WART programa Rubber Scale perRubber-powered models oldest types flying models ever built thanks some software written authors wife get assistance newest products market program can used predict flight characteristics save heartbreak spend ing hours constructing model cant made perform up expectations ELeon Bennett July1985 53 formance technique assembled local hacker wife left-most column gives W sum airframe weight rubber weight R final column T yields corresponding duration sec onds look R column interpolate bit between 38 43 estabish 40gm value can see equivalent duration time will roughly 34 sec prediction unfortunately quite accurate known never would have built foul thing takes about 45 sec competitive hereabouts can hope achieve 45 sec upping rubber 60 grams theres simply no place put stuff Yes turkey spotter WART program works well However eagles sensed equal ease Consider Moth Minor printout computer used design aid arriving right combination configuration rubber assure 1-mm flight despite all-up flying weight roughly 22 oz result ing model 91-in span probably worlds biggest Rubber Scale job dealing something far out ordinary experience cannot serve guide computers insistence 128gm rubber 16 strands -in FAI 4 ft long would yield time low 60-sec range would have lacked courage proceed model turned out well won NASA Na tional Assn Scale Aeromodelers Scale Achievement Award 1983 National Contest actual WART program given figure centered Jumbo Scale will handle kind rubber-powered flight after certain amount tinkering see Nitty-Gritty further Written M-Basic Kaypro II program development earlier version written satisfactorily run VIC-20 minor syntax modifica tions requiring elementary familiarity programming can adapted other personal computers print out useful element can just well printer on-screen output sufficient use program must supply following data 1 The wing area square inches 5 2 The airframe weight everything ex cept rubber grams 3 The glide ratio pure number form G Continued page 141 54 Model Aviation THE OR 05 Ai output programs analysis Moth Minor shows flight times excess 1 mm 128 grams rubber suggesting plane indeed eagles Output rom programs analysis OT authors P- turKey witn 40 grams OT rubber planes capacity has no chance reaching flight times competitive 45-sec range knowledge hand before starting construction can save yourself frustration can result building plane Just bcause looks right Authors iron Dog P-3m proved WART just adept finding turkeys confirmed good looks high hopes wont necessarily make good-flying model RC Helicopters/Jolly Continued page 51 line look forward seeing something new Toledo saw several Scale machines static competition no less four Airwolf/Heim 22s very nice Jet Ranger excellent Hind Mil 24d constructed Mike Robbins Toledo always great show year no exception wish would move later year cold weather something else months photos During recent visit OMP able view new prototype Gorham MF-1 target drone machine 10-ft-long range word awesome Intended training aid armed services drone features 22-hp engine weighs 75 pounds fuselage one-fifth scale Mu 24 Hind D typical type operated Soviets As can seen photos MF-l fliesand does very well Im sure wish John well projectand way dont look local hobby shop month also have some pictures personal Airwolf model fea tures own fiberglass fuselage Heim retracts GMP Competitor mechanics rotorhead prototype flybarless design GMP engine OS 60 FSR-H has proved excel lent power li-lb machine particular model has approximately 40 hours failures speaks well components used off-the-shelf items months three-view large Soviet military helicopter design Mil 24 goes back late Sixties United States already realizing potential armed military machine Indeed era Bell came up successful Cobra design Soviets took little longer get gunship service Hind D has proved capable dealing machines Mil 24 very large 56 ft length also very fast Hind cruises 175 mph range holds two world speed records its class Because Hind features articulated rotorhead nimble its US counterparts can however transport squad eight troops scene battle offer standoff protection well definite tankbusting capabilities no wonder NATO concerned rapid develop ment deployment formidable weapon no kit Hind D however have one-twelth scale fuselage available youre planning conquest western Europe BCNU Lariy Jolly 5501 W Como Santa Ana CA 92703 WART Program/Bennett Continued page 54 wing area taken straight plans consider portion wing either passing through fuselage blanketed fuselage high wing Count area sticking out breeze area given square feet multiply 144 convert square inches airframe weight includes absolutely everything carried aloft exception rubber convert ounces grams multiply 29 Usually given plans accompanying article can worked out see Nitty-Gritty glide ratio consists distance traveled horizontally foot verti cal drop Imagine test-gliding finished well-trimmed model height 6 ft launch perfect model travels say 18 ft horizontally fore hits ground G 18/6 3 G value reflects two separate qualities lift drag airfoils speeds trim settings us employ lift coefficient pretty close 10 However drag can vary over wide range depending cleanliness configuration also models size models Jumbo Scale size range list configurations cor responding G values given G Table have worked out either using drag coefficient ooncepts have set in-flight observations use table search among configu rations until find something cor responds cleanliness model pick out proper G factor Also see Nitty-Gritty additional G advice Rubber weight R need known point virtues WART program presents automatically wide range rubber motors everything light motor trimming purposes all-out heavyweight motor contest work program assumes possible range rubber weight values between limits 7% 33% have choice concerns increments ofRthat examined queried What step R should enter 5 R values used computation will 5gm apart find best way use feature home-in final answer choosing progressively finer increments design becomes seriously considered choose too fine increment early stages design tends produce avalanche data difficult handle table generated running pro gram supplies estimated duration motor possibility sense can simply choose printout motorduration combination like catch program assumes rubber being used effectively worrying Continued page 144 DGA DESIGNS /0 Full Body Pilot Kit eLightest Pilot available Lifeiike vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions Fuliy positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2 oz$ 795 lI4Scale4oz$ 995 1/3ScaieSoz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6 Scale 75 oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 sLightest bust pilot available sLifelike vinyl latex rubber parts sEasy assemble finish eBuild either barnstormer sportsman pilot skit contains pilot head helmet cap goggles jacket instructions See deaier order direct Add $100 shipping direct orders Send $100 current cataiog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-No COD 5 3 NION PNRFORMANCE 0*50 LAUNeNEE CLINERS ENOM CIGNYWEIGOT ALUMINUM NEVERACE CANS Two FULL SIZE PATTERNS TOOK CUOICELLOSTNATEE *ONITIONAL PATTEENN NION tACO ON Sb PACE PICE EBb SOUTOE*STENN P0 NONO tOOLErOB. oENB July1985 141 1j~MAGIC MAGNET BWLDERW ByEIdonJ Lind Co 2912 Walker Lee Los Alamitos CA 90720 about short noses balancing difficulties matching prop motor reasons must have some notion just much rubber practical configuration prop under study Some times plans will give rubber weight available might use R20% reasonable working figure Check Nitty-Gritty advice Drawbacks OK whats wrong Will future contests consist fliers hunched over consoles type entries Fear process has merit also has drawbacks greatest lack precision process works well turkey spotter Ditto eagle identification ever comes distinguishing good eagles better eagles hopeless tur keys more-hopeless turkeys system falters Introducing. #irebai1 RIC Idle-Bar Glow Plugs Also.Long Short$1 69 Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $129 SwansonAssociates PO Box 151 Wayne NJS,n 7948 07470 basic difficulty imprecise input concerns input operator bring computer also input stored within program example program assumes prop efficiency 50% evidence substantiate figure lower end tested Wakefield prop-efficiency numbers highly probable good Rubber Scale props 50% range However either prop-carving whiz dub might somewhat better considerably worse 50% As move away 50% predictive power program weakens input factors sort have built programranging type rubber mode flight short program works best adhere standard practices aspect mod eling As standard practices departed program becomes increasingly inaccurate second drawback computer makes no comment practical aspects design Weve already noted New completely automatic malr..., system wet galled cells No run-down batteries xplosive gasses generated undercharged inter storage problems No boiled-dry batteries tteotiox required-electronically overcharged maintains toll charge No e axxc pou a, JUST CONNECT ITTHEN FORGET IT 0005 on Mdspecify Bar 12 volt PO Box 221 $4995~araCanton SD 57013 Proacts 5A 987-5024 $250 S&H E information connection rubber weight other practical considerations ignoredeverything whether model will stay right-side-up field worthiness thermal sensitivity ROG capability tree slitherness work ing Nitty-Gritty following assumptions built program model powered rubber capable storing 2800 ft-lb energy per unit weight wound 75% max turns Hysteresis loss reduces energy returned 60% max poten tial Prop efficiency 50% mode flight slow cruise Available energy deduced rubber weight above efficiency factors expended work due drag Once energy consumed flight over other words flight mode described does consider climb glide effects upon duration sup port 1975 NFFS Sympo view rather modest climb rates subse quent glides typical Rubber Scale flight have little effect overall duration Given dead air would about well expending rubber energy steady cruising Wing area S top plan-view area wanted Given mild amount dihedral error involved ignoring dihedral effects small However considering wings exaggerated polyhedral will necessary reduce wing area horizontal projected area Airframe weight calculate work up total volume balsa cubic inches multiply two get weight grams average-density 8-lb balsa Add 20% weight glue Tissue weighs 1gm per 90 sq Music wire 1/16 weighs 5gm per lineal foot Glide ratio G Values given table based Reynolds numbers 100000 range scale corresponding large Jumbo Scale model assumed wing Clark Y section flying 20% less maximum lift coefficient Most listed drag values computed 144 Model Aviation An Ideal way build balsa construc ted model airplane wings fuselage stabilizers elevators rudders Build fast easy straight true Makes other methods obsolete CONTENTS 1 -16x48 STEEL PLATE 30- MAGNETS 60- MAGNETIC POLES 10-5 UPRIGHTS 10- 1 x 10/32 BOLTS 10-10/32 NUTS useful tool will last lifetime nothing wear out Magnetically holds balsa parts place glulng No damaged split weakened wood using pins WART Program/Bennett Continued page 141 nem Oxuier oroer xirecs AdO 5200 snipping avG handlingPO Box 05 Champaign IL 61020 classic expressions taken Schlichting Boundary Layer Theory McGraw Hill quick-and-dirty rule-of-thumb Jumbo Scale try following really clean go 5 average drag go 4 fairly draggy outsize fliselage cross section lots struts go 3 Rubber R maximum length rubber motor can effectively stored used bunching balance problems about three times distance prop hook center gravity CG Rubber weighs roughly 2gm per lineal foot -in FAI 16gm per foot -in Sig flying all-out perform ance event turns approaching max used ratherthan assumed 75% contained program can alter formula reflect increased energy level Duration directly proportional stored energy store 10% energy given weight rubber specffied program will extend duration 10% future go Will computer-assisted design wipe out turkeys leaving nothing eagles sky will computer prove monster destroying fun aspect mod eling reducing game bunch number crunching Its too early tell few programs have available today wont really change game time can expect programs everything prop design rib spacing As computer assumes every-growing role some whittler types may throw down razor blades leave Others will face reality study computing Yes difficult life-style deci tions will have made us concerning computer think married hacker Address questions and/or bitter zomplaints either Leon Bennett mod ler and/or Rachelle Bennett hacker 6 Rivercrest Rd Bronx NY 10471 replies please include SASE FF Duration/Murphy Continued page 57 length time As engine rpms increase dangers multiply some clubs have already taken strides endorse outlawing use wood props non-reinforced plastic props high-performance engines continuous-filament fiber glass/epoxy resin concepts appear put up best defense preventing associat ed mishaps Carbon fiber fiberglassreinforced plastic props obviously quite expensive since produced cottage industry present relatively inexpensive com pared price someones eye worse sooner commercially svailable reinforced concepts hit marSignal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $9795 check money order TTBT~ II u ox 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranty cted dealerships available ketplace safer flying field will new ultra-high-rpm ducted fan powerplants already beginning replace traditional Schneurle main stays thus causing greater safety concerns Appropriately-reinforced epoxy propellers definite requirement engines Maybe will need mal approval procedure prop manu facturers before long similar Underwriters Laboratories service electrical industry rate begin police problem ourselves could very possibly receive consider able amount unsolicited outside aid matter does old adage go An ounce prevention worth pound cure Anyway may wish discuss matter future meeting flying club O&R diary Tim Daniels February issue fine publication Engine Collec torsJournal lists complete index whole Ohlsson Rice lineup engine products very first Ohlsson Mini ature 56 1937 final 049 effort around 1956 complete over 80 pictures associated descriptions different engine versions concepts such famous sideport 23s 60s later front-rotary-valve ver sions post-ignition series glow plug engines Tim credits Ted Enticknap provid ing majority index material July1985145
Edition: Model Aviation - 1985/07
Page Numbers: 52, 53, 54, 141, 144, 145
Author launches 91-in Moth Minor plane looks should terrific performer flight time low 605 just WART program said would programs predictive powers substantiated model won NASA Scale Achievement Award 1983 Nats Author says wouldnt have begun construction numbers hadnt good ptm hg ruru LilirilpitEll warts COMPUTERS chose configuration What Just pick out makes blood sing take plunge Right No right Typical yes right such outbursts passion emerge turkeys defective genes psychotic souls turkeys end days hangar queens hobby room mobiles recognize turkey before build Certainly looks alone anyone smirking looks right will fly right would ask Have seen Don Srulls version Santos Dumont 14 bis Thats pusher canard biplane Don has successfully spanned application range Indoor Rubber Scale full RC anyone thinks oonfiguration looks right suggest quick return gamboling elves fairies gardenand leave striving us appearance what serve guide seek separate turkeys eagles Performance swer poetic descriptions perform ance heroic myths performance owe much chance 45-mm flights 52 Model Aviation listing WART program written M-Basic forthe Kaypro Ii Only slight moditications Basic language syntax should neces saryto makethe program run mostall personal computeraso itcan giveyou powertoseparatethe eaglestrom theturkeys advance everyday meat-and-potatoes perform ance Methods measuring performance fore construction have available years However process proved tedious reduce iron-willed tears arrival friendly com puters picture has change drastically Once right program stored innards computer can check out flight characteristics design few seconds Yes performance stability such esoteric topics big make tail can resolved before reach wax paper An example thing happens large Rubber Scale Im sucker clean lines felt fatal attraction P-39 Ignoring implications curious nickname Iron Dog feverishly built 1m-scale version turned out great turkeys time Despite Wakefield model load rubber 40gm has never cracked 35 sec its long misCerable life Check P-39 printout supplied WART programa Rubber Scale perRubber-powered models oldest types flying models ever built thanks some software written authors wife get assistance newest products market program can used predict flight characteristics save heartbreak spend ing hours constructing model cant made perform up expectations ELeon Bennett July1985 53 formance technique assembled local hacker wife left-most column gives W sum airframe weight rubber weight R final column T yields corresponding duration sec onds look R column interpolate bit between 38 43 estabish 40gm value can see equivalent duration time will roughly 34 sec prediction unfortunately quite accurate known never would have built foul thing takes about 45 sec competitive hereabouts can hope achieve 45 sec upping rubber 60 grams theres simply no place put stuff Yes turkey spotter WART program works well However eagles sensed equal ease Consider Moth Minor printout computer used design aid arriving right combination configuration rubber assure 1-mm flight despite all-up flying weight roughly 22 oz result ing model 91-in span probably worlds biggest Rubber Scale job dealing something far out ordinary experience cannot serve guide computers insistence 128gm rubber 16 strands -in FAI 4 ft long would yield time low 60-sec range would have lacked courage proceed model turned out well won NASA Na tional Assn Scale Aeromodelers Scale Achievement Award 1983 National Contest actual WART program given figure centered Jumbo Scale will handle kind rubber-powered flight after certain amount tinkering see Nitty-Gritty further Written M-Basic Kaypro II program development earlier version written satisfactorily run VIC-20 minor syntax modifica tions requiring elementary familiarity programming can adapted other personal computers print out useful element can just well printer on-screen output sufficient use program must supply following data 1 The wing area square inches 5 2 The airframe weight everything ex cept rubber grams 3 The glide ratio pure number form G Continued page 141 54 Model Aviation THE OR 05 Ai output programs analysis Moth Minor shows flight times excess 1 mm 128 grams rubber suggesting plane indeed eagles Output rom programs analysis OT authors P- turKey witn 40 grams OT rubber planes capacity has no chance reaching flight times competitive 45-sec range knowledge hand before starting construction can save yourself frustration can result building plane Just bcause looks right Authors iron Dog P-3m proved WART just adept finding turkeys confirmed good looks high hopes wont necessarily make good-flying model RC Helicopters/Jolly Continued page 51 line look forward seeing something new Toledo saw several Scale machines static competition no less four Airwolf/Heim 22s very nice Jet Ranger excellent Hind Mil 24d constructed Mike Robbins Toledo always great show year no exception wish would move later year cold weather something else months photos During recent visit OMP able view new prototype Gorham MF-1 target drone machine 10-ft-long range word awesome Intended training aid armed services drone features 22-hp engine weighs 75 pounds fuselage one-fifth scale Mu 24 Hind D typical type operated Soviets As can seen photos MF-l fliesand does very well Im sure wish John well projectand way dont look local hobby shop month also have some pictures personal Airwolf model fea tures own fiberglass fuselage Heim retracts GMP Competitor mechanics rotorhead prototype flybarless design GMP engine OS 60 FSR-H has proved excel lent power li-lb machine particular model has approximately 40 hours failures speaks well components used off-the-shelf items months three-view large Soviet military helicopter design Mil 24 goes back late Sixties United States already realizing potential armed military machine Indeed era Bell came up successful Cobra design Soviets took little longer get gunship service Hind D has proved capable dealing machines Mil 24 very large 56 ft length also very fast Hind cruises 175 mph range holds two world speed records its class Because Hind features articulated rotorhead nimble its US counterparts can however transport squad eight troops scene battle offer standoff protection well definite tankbusting capabilities no wonder NATO concerned rapid develop ment deployment formidable weapon no kit Hind D however have one-twelth scale fuselage available youre planning conquest western Europe BCNU Lariy Jolly 5501 W Como Santa Ana CA 92703 WART Program/Bennett Continued page 54 wing area taken straight plans consider portion wing either passing through fuselage blanketed fuselage high wing Count area sticking out breeze area given square feet multiply 144 convert square inches airframe weight includes absolutely everything carried aloft exception rubber convert ounces grams multiply 29 Usually given plans accompanying article can worked out see Nitty-Gritty glide ratio consists distance traveled horizontally foot verti cal drop Imagine test-gliding finished well-trimmed model height 6 ft launch perfect model travels say 18 ft horizontally fore hits ground G 18/6 3 G value reflects two separate qualities lift drag airfoils speeds trim settings us employ lift coefficient pretty close 10 However drag can vary over wide range depending cleanliness configuration also models size models Jumbo Scale size range list configurations cor responding G values given G Table have worked out either using drag coefficient ooncepts have set in-flight observations use table search among configu rations until find something cor responds cleanliness model pick out proper G factor Also see Nitty-Gritty additional G advice Rubber weight R need known point virtues WART program presents automatically wide range rubber motors everything light motor trimming purposes all-out heavyweight motor contest work program assumes possible range rubber weight values between limits 7% 33% have choice concerns increments ofRthat examined queried What step R should enter 5 R values used computation will 5gm apart find best way use feature home-in final answer choosing progressively finer increments design becomes seriously considered choose too fine increment early stages design tends produce avalanche data difficult handle table generated running pro gram supplies estimated duration motor possibility sense can simply choose printout motorduration combination like catch program assumes rubber being used effectively worrying Continued page 144 DGA DESIGNS /0 Full Body Pilot Kit eLightest Pilot available Lifeiike vinyl la tex rubber parts Easy assemble finish eBulid either barnstormer sportsman pilot Kit contains pilot head hands boots helmet cap goggles full templates easy instructions Fuliy positionable & moveable oSome simple sewing required WeightPrice 1/6 Scale2 oz$ 795 lI4Scale4oz$ 995 1/3ScaieSoz*$1695 Weightmay vary depending material used construction DGA DESIGNS Bust Pilot Kit Weight 1/6 Scale 75 oz 1/4 Scale 1Soz 1/3 Scale 225 oz Price 595 795 $1495 sLightest bust pilot available sLifelike vinyl latex rubber parts sEasy assemble finish eBuild either barnstormer sportsman pilot skit contains pilot head helmet cap goggles jacket instructions See deaier order direct Add $100 shipping direct orders Send $100 current cataiog Dealers inquiries invited NYS Residents add 7 percent sales tax Send Check MO Allow 3 weeks check clearSorry-No COD 5 3 NION PNRFORMANCE 0*50 LAUNeNEE CLINERS ENOM CIGNYWEIGOT ALUMINUM NEVERACE CANS Two FULL SIZE PATTERNS TOOK CUOICELLOSTNATEE *ONITIONAL PATTEENN NION tACO ON Sb PACE PICE EBb SOUTOE*STENN P0 NONO tOOLErOB. oENB July1985 141 1j~MAGIC MAGNET BWLDERW ByEIdonJ Lind Co 2912 Walker Lee Los Alamitos CA 90720 about short noses balancing difficulties matching prop motor reasons must have some notion just much rubber practical configuration prop under study Some times plans will give rubber weight available might use R20% reasonable working figure Check Nitty-Gritty advice Drawbacks OK whats wrong Will future contests consist fliers hunched over consoles type entries Fear process has merit also has drawbacks greatest lack precision process works well turkey spotter Ditto eagle identification ever comes distinguishing good eagles better eagles hopeless tur keys more-hopeless turkeys system falters Introducing. #irebai1 RIC Idle-Bar Glow Plugs Also.Long Short$1 69 Traditional line non-idle bar Glow Plugs Six Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $129 SwansonAssociates PO Box 151 Wayne NJS,n 7948 07470 basic difficulty imprecise input concerns input operator bring computer also input stored within program example program assumes prop efficiency 50% evidence substantiate figure lower end tested Wakefield prop-efficiency numbers highly probable good Rubber Scale props 50% range However either prop-carving whiz dub might somewhat better considerably worse 50% As move away 50% predictive power program weakens input factors sort have built programranging type rubber mode flight short program works best adhere standard practices aspect mod eling As standard practices departed program becomes increasingly inaccurate second drawback computer makes no comment practical aspects design Weve already noted New completely automatic malr..., system wet galled cells No run-down batteries xplosive gasses generated undercharged inter storage problems No boiled-dry batteries tteotiox required-electronically overcharged maintains toll charge No e axxc pou a, JUST CONNECT ITTHEN FORGET IT 0005 on Mdspecify Bar 12 volt PO Box 221 $4995~araCanton SD 57013 Proacts 5A 987-5024 $250 S&H E information connection rubber weight other practical considerations ignoredeverything whether model will stay right-side-up field worthiness thermal sensitivity ROG capability tree slitherness work ing Nitty-Gritty following assumptions built program model powered rubber capable storing 2800 ft-lb energy per unit weight wound 75% max turns Hysteresis loss reduces energy returned 60% max poten tial Prop efficiency 50% mode flight slow cruise Available energy deduced rubber weight above efficiency factors expended work due drag Once energy consumed flight over other words flight mode described does consider climb glide effects upon duration sup port 1975 NFFS Sympo view rather modest climb rates subse quent glides typical Rubber Scale flight have little effect overall duration Given dead air would about well expending rubber energy steady cruising Wing area S top plan-view area wanted Given mild amount dihedral error involved ignoring dihedral effects small However considering wings exaggerated polyhedral will necessary reduce wing area horizontal projected area Airframe weight calculate work up total volume balsa cubic inches multiply two get weight grams average-density 8-lb balsa Add 20% weight glue Tissue weighs 1gm per 90 sq Music wire 1/16 weighs 5gm per lineal foot Glide ratio G Values given table based Reynolds numbers 100000 range scale corresponding large Jumbo Scale model assumed wing Clark Y section flying 20% less maximum lift coefficient Most listed drag values computed 144 Model Aviation An Ideal way build balsa construc ted model airplane wings fuselage stabilizers elevators rudders Build fast easy straight true Makes other methods obsolete CONTENTS 1 -16x48 STEEL PLATE 30- MAGNETS 60- MAGNETIC POLES 10-5 UPRIGHTS 10- 1 x 10/32 BOLTS 10-10/32 NUTS useful tool will last lifetime nothing wear out Magnetically holds balsa parts place glulng No damaged split weakened wood using pins WART Program/Bennett Continued page 141 nem Oxuier oroer xirecs AdO 5200 snipping avG handlingPO Box 05 Champaign IL 61020 classic expressions taken Schlichting Boundary Layer Theory McGraw Hill quick-and-dirty rule-of-thumb Jumbo Scale try following really clean go 5 average drag go 4 fairly draggy outsize fliselage cross section lots struts go 3 Rubber R maximum length rubber motor can effectively stored used bunching balance problems about three times distance prop hook center gravity CG Rubber weighs roughly 2gm per lineal foot -in FAI 16gm per foot -in Sig flying all-out perform ance event turns approaching max used ratherthan assumed 75% contained program can alter formula reflect increased energy level Duration directly proportional stored energy store 10% energy given weight rubber specffied program will extend duration 10% future go Will computer-assisted design wipe out turkeys leaving nothing eagles sky will computer prove monster destroying fun aspect mod eling reducing game bunch number crunching Its too early tell few programs have available today wont really change game time can expect programs everything prop design rib spacing As computer assumes every-growing role some whittler types may throw down razor blades leave Others will face reality study computing Yes difficult life-style deci tions will have made us concerning computer think married hacker Address questions and/or bitter zomplaints either Leon Bennett mod ler and/or Rachelle Bennett hacker 6 Rivercrest Rd Bronx NY 10471 replies please include SASE FF Duration/Murphy Continued page 57 length time As engine rpms increase dangers multiply some clubs have already taken strides endorse outlawing use wood props non-reinforced plastic props high-performance engines continuous-filament fiber glass/epoxy resin concepts appear put up best defense preventing associat ed mishaps Carbon fiber fiberglassreinforced plastic props obviously quite expensive since produced cottage industry present relatively inexpensive com pared price someones eye worse sooner commercially svailable reinforced concepts hit marSignal Guard blocks random noise off-frequency signals can cause loss control air land RO models Signal Guard responds sig nals its own precisely tuned fre quency ignoring static noise craft itself Plus additional amplification allows control operators visual limit want spend time flying less time money repairing crashed model Signal Guard answer Call toll-free 1-800-468-8215 order Signal Guard TM major credit card send $9795 check money order TTBT~ II u ox 30179 Portland OR 97230 Oregon call collect 503-257-0912 90 day warranty cted dealerships available ketplace safer flying field will new ultra-high-rpm ducted fan powerplants already beginning replace traditional Schneurle main stays thus causing greater safety concerns Appropriately-reinforced epoxy propellers definite requirement engines Maybe will need mal approval procedure prop manu facturers before long similar Underwriters Laboratories service electrical industry rate begin police problem ourselves could very possibly receive consider able amount unsolicited outside aid matter does old adage go An ounce prevention worth pound cure Anyway may wish discuss matter future meeting flying club O&R diary Tim Daniels February issue fine publication Engine Collec torsJournal lists complete index whole Ohlsson Rice lineup engine products very first Ohlsson Mini ature 56 1937 final 049 effort around 1956 complete over 80 pictures associated descriptions different engine versions concepts such famous sideport 23s 60s later front-rotary-valve ver sions post-ignition series glow plug engines Tim credits Ted Enticknap provid ing majority index material July1985145