How to Select an Old-Timer

You cant judge track records SAM FF events predict what designs will beat out competition AMAs RC Electric Event 618 U Bill Baker ELECTRIC POWERED RC flying fast growing popularity more contests fun-flys scheduled club regional calendars 1991 category offered first time AMA National Aeromodeling Championships See Frank Kormans fine report November 1991 Model Aviation Jerry Smartts Cleveland Viking won RC Electric AMA Event #618 1991 Nationals Viking weighed 37 oz Jerry Smartt photo popular event seems Class Sailplane event No 610 event restricts battery pack maximum seven Ni-Cd cells Class Sailplane flown 1991 Nationals 30-second motor run 8-minute maximum flight time points landing inside designated area 152 Model Aviation y smarti used dummy gas engine Brooklyn Dodger ballast help CG problem caused lots wood aft fuselage Frank Korman photo Probably second popularity club contests AMA Event No 618 Class Old-Timer Limited Motor Run event intended pre-1943 designs motor run increased 40 seconds Otherwise Class Old-Timer used same rules Class Sailplane 1991 Nationals purpose article twofold analyze what makes Old-Timer design competitive event 618 identify models desirable characteristics Please understand rules event differ used Society Antique Modelers SAM events General remarks selecting designs SAM events appear later article noncompetitive flier can happy flying design appeals him Maybe has got some roots design maybe just likes way looks want win contests though emotion alone wont winning goal have think logically Early free flight gas designs large low-powered very stable During 1930s 1940s climb got faster engine run shorter designs changed rapidly stay competitive win free flight needed model high ratio power weight low ratio weight wing area design configuration could handle large trim changes between power-on power-off early designs center-ofgravity CG about 30% MAC mean aerodynamic chord large rudders nonlifting stabilizers relatively large mber 1992 153 Left Frank Korman wins contest Strata Streak Jake Hamilton awards trophy Right Franks Strato Streak aka Electromoose up close Note elevator side tiny rudder Korman photos Jay Burkart won 2nd event 618 91 Nationals Astro cobalt FAI 05-powered Playboy Korman photo appearance f characteristics performance make man love airplane told truly what put emotion love lot things live around isnt woman isnt horse nor before nor after lovely great airplane men love faithful though leave others . Ernest Hemingway Left Jerry Smartt L Bill Jenkins Cleveland Vikings Right Tom williams uianoma City UK flew fli5 45-oz Lanzo Bomber third place Event 618 91 Nationals used seven 1200-mAh cells Korman photos angles positive incidence between wing stabilizer free flight folk call decalage Under high power models simply went nuts either spiral diving looping themselves death satisfy requirement faster climbs shorter engine runs free flight gas designers introduced large airfoilsectioned lifting stabilizers small fins large lifting stabilizers accomplished two things dictated CU moved aft typically 50% 75% chord reduced decalage arrangement made model vulnerable dreaded spiral drive spiral diving could usually kept within tolerable limits reducing rudder area point producing Dutch roll Before long competitive designsZippers Interceptors Strato Streaks various derivativeshad eclipsed sort-of-looks-like-a-realairplane predecessors Wouldnt Zipper Interceptor competitive AMA Event 618 Well could worse Remember though RC Electric event different requirements say modem-era SAM free flight events Designs unlikely win latter events could prove competitive superior RC events Hey could use some variety contests once threatened take two photographs Playboy Lanzo Bomber cover SAM Champs RC events enlarging reducing other suit class being flown hasten add Old-Timer presently have ready fly Playboy love love Bomber too models competitive betcha Still doesnt keep considering other designs next model Event 618 emphasizes duration short motor runeight minutes long time fly 40 seconds climb 1991 Nationals points also awarded landing designated area couldnt come back upwind land near area launch lost points Four performance factors affect models success eventclimb glide controllability penetration glide speed Lets examine turn Climb increase climb rate primarily increasing ratio power weight get lots power short time 7 place large loads geared motor drawing current seven-cell battery rate 40 amps brings nominal 05 motors usually flown about 120 watts 17 amps x 7 cells power up 280 watts power 40 amps x 7 cells 154 Model Aviation e Kirk Massey Ollie adapted design published 1951 Air Trails article Right Kirk launches Ollie annual New Orleans Electric meet Photo Ben B Mathews Jr Above Jack Phelps electrified Ed Lidgard HiHo pre-1943 rubber-power design Right MAs Harry Murphy looses gas-powered Zeek NosGas meet Bill Baker photos Below Mike Finnans Candid John Pond plans Light low-drag ship gets lots power Astro FAI cobalt 05 Right Kirk Massey sells full-size plans Ollie PO Box 496 Willis TX 77378 Ben B Mathews Jr photos Continued page 157 motion bomb falls nearly straight down planes disqualified flying lower 100 feet accuracy about same models about half bombs landed circle full-scale carrier landings also much like Some pilots tried too hard touched down rather heavily fewer bounces Jo Jo Sheble made excellent two-point landing Piper Cub Touching down circle just past line Jo Jo came full stop big cloud lime dust Cubs tail held up off ground propwash wagged elevators crowd continued Naturally everyone cheered John Armentrout came roaring Decathlon five feet smoke Ive never close smoke trail before Diesel trucks seem clean odorless comparison Student pilot Joan McCoy impressed instructor won first place bomb drop eventgood $250 aviation fuel donated Air Petroand tied second An excellent Mexican barbecuerice beans makings giant burritosbegan 1100 am Iced tea apple turnovers also served * Old TimerlBaker Continued page 154 Astro cobalt motors will stand load short runs dont think youd want run five minutes level Fliers 1991 Nationals achieved power increase using propellers diameters up 14 11-in prop youll seldom exceed 20 amps Low weight Okay takes care high power about low weight Two factors involvedairframe weight other stuff First other stuff radio receiver servos etc must light need on/off controller brake stop propeller might consider battery eliminator circuit BEC well Jomar High Sky both make on/off controller BEC Ive using Jomars recently like also like older High Sky device BEC Id expect new version work well too Though controller BEC about ounce lighter BEC ounce can make difference event comes airframe weight design itself critical wood selection Some designs simply call woodmore pieces parts weight can reduce weight limited extent using low-density wood strength considerations allow longerons spars leading edges need tough classic box fuselage exemplifies lightweight airframe design Its hard get lighter four-longeron box Add lots formers stringers add weight As Hank Struck put years ago Simplicate add lightness Take Goldberg Sailplanea mber 1992 157 spot landing Besides Joans firstplace prize trophies awarded third place both events Electric F ight Lighteneight 12 oemoney back Adjustable switching point Solderless terminal easy hookup ON OFF Controller $2995 Power save weight Veiy high efficiency 006V laos 20 Size 22xt2x63 Add $100 toe shipping Colifonio rwidorns add 72500 $217 Tee Send Check money order conies willyHigh Sky rnaoha esesecior3929 Kansas St #9 oth~oeeSan DiegoCA 92104 PVFC/SIOAl BUILT oniy name promise U F 1 Winning designs 1990 TOC 1st 2nd 3rd 5th ULTIMATE LASER 200 really caii fly better wfth better built airplane PRECISION BUILT INC WY 281 N BRANCH X 78070 $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/G REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE top champions purchase Precision Built models 2 lightest airtrames available ModeLs Available EXTRA 260 STEPHENS AKRO 512 438-3330 2-wheel gear 1 ycles 1 7995 includes amplifier CONTROL w Kraft Midwest Inc 115 E Main Norchville MI 48167 313/348-0085 fl Fax 313/348-4175 wonderful design tends get heavy scale down original size about 72-in span probably about 900 sq wing area Sailplane can handle lot power flew white-case McCoy 60 making highly competitive free flight scaled wing area down say 550-600 sq seems about right 40-secondmotor-mn event youd have hard time compensating extra pieces using low-density wood can want know buy wood Other designs too parts scale down light Hemy Struck-designed New Ruler Zipper Playboy Strato Streak Lanzo Bomber other hand scale down fine low parts count makes easy build light Thats Strato Streak dominated 02 Replica free flight Though Playboy has four main longerons four assistant longerons using softer wood keeps weight down Glide factors benefit aircrafts glide fairly complex major ones low wing loading low dragbut low weight greatest importance smaller model gets lower wing loading has to match original glide large cross section Old-Timer designs promotes tendency high drag Although some designs featured cleaner lower-drag fuselages landing gears wheels some airfoils high drag along high lift Some models one-wheel landing gear others single-wheel retractable gear What about airfoils Should airfoil flat-bottom undercambered thick thin critical factor probably mean camber line High-camber airfoils fly slowly may have very low sink rate power however drag increases rapidly slowing climb reducing ability penetratethat glide back upwind Obviously trade-off factors involved might choose Clark Y-type alrfoil flat-bottom raised entry example over deeply undercambered type used Playboy Goldberg Sailplane sacrificing bit sink rate sake better climb penetration Thats whats fun about designing airplanes selecting among older designsthe choices compromises crade-otfs make model bigger glide better give up some glide better climb rules should change shorten motor run foresee swing greater emphasis climb less emphasis glide Penetration low drag aerodynamically clean modern RC Sailplane makes craft seem almost frictionless moves through air increase penetration windy days speed task modern Continued page 160 158 Model Aviation KMI ULTRA AM RECEIVER y KMI RETRACTS Cs COMPETITION ENGINES CSG048NORMALABC29KRPMREG CSG049SPEEDABC55KRPMREG CSG061NORMALABC27KRPMREG CSG061SPEEDABC35KRPMREG CSG09NORMALABC27KRPMREG CSG09SPEEDABC35KRPMREG NEWCSGuNABC27KRPMREG CSGISPSPORTSBB18KRPMREG CSG15NORMALABC27KRPMREG CSG15SPEEDABC37KRPMREG CSG15SPEEDMC37KRPMREG NEWCSG1SABCCOMBATSPECIALREG CSDI 5Th MC TEAM RACEDIESELREG CRC TEAM RACE CARBURETOR FOR I5TR REG CSG21SPEED ABC29K RPMBEG CSG21NMARINE ABC28K RPMREG CSG6022 ABC 2 TO19K RPMREG CS1TUNED PIPE 049-061REG C59TUNED PIPE 09REG C52TUNED PIPE 15-2160REG CSHGLOWPLUGS FOR CS ENGINESREG CSRSPEEDPAN 040-06109REG CSWSPEEDPAN 1 5-21REG $142SALE $149SALE $142SALE $146SALE $137SALE $142SALE $140SALE $ 55SALE $129SALE $139SALE $140SALE $145SALE $169SALE 55 SALE S139SALE $149SALE $155SALE S 20SALE 31SALE 39SALE 390SALE 39SALE 54095 SALE ALL ENGINES ARE TEST RUN BEFORE THEY LEAVE THE FACTORY QUALITY OF WORKMANSHIP-GUARANTY 049 Normal First Place 049 Speed First Place 21 MARINE & 60 2X2 COME WITH CARE ALL OTHER ENGINES EXCEPT 15 TR COME WITH UC VENTURI & NEEDLE VALVE ASSEMBLY 1/2 & 15 ENGINES COMES WrTH BUTTONHEAD TYPE GLOW PLUG ALL ENGINES EXCEPT 1 5P-1 SIR &60 COME 04TH ALUMINUM SPINNER THE 21 N HAS GROOVE FOR BELT START NEW RACE 160 AFTER RUN OIL REG $399 INTFE SALE 5249 CSG CSG US Nationals CSG 60 First Place PARIS WORLD CHAMPIONSHIPS $12950 $13650 $12750 $12906 $11950 $12450 $12259 $4975 $11150 $12150 $13150 $12775 $15775 $5075 512150 Si 31 50 $14175 $2775 $2975 $3775 $ 375 $ 3575 $4150 CS PULSE JET ENGINES VALVELESS STAINLESS STEEL RUNS ON REGULAR GASOLINE 5/P 1 20 LBS THRUST $10075 0/P 1 LBS THRUST $21575 NEW AT AERO ENGINES LTD ITALIAJ4 PRECISION AT AFFORDABLE PRICES CIPOLLAtS P/C W/ MUFFLER $0450 120 41 ISV R/C 4 CYCLE $26450 SEND MAIL ORDERS TO YOUNGSTERS SPECIAL1viI-CJISUJH NEW RUSSIAN 049 UC GLOW 54975 2014 BUCKLEY AVE MUST BE UNDER 1 B YEARS OLDPOR THIS E WORTH Pt 33401 SPECIAL PLEASE!ftI I.4075056150 PROM 6PM TO 9PM ADULT PURCHASE PRICE$SB75 EXCLUSIVE Cs DISTRIBUTOR DEALER INDUIRIES INVITED CHARGE IT II SEND 5050 OR SOIFFING & hANDLING COO ADO 9300 Must have expiration date Master Charge bank numbe F OASANESOETSAOSO%SALESTAItCHEDORMONEYOROEN 160 Model Aviation 4CL CarrierlJohnson Continued page 84 Johnson scored personal high 2295 Joe JUSt using borrowed Sig Skyray powered McCoy 35 second score 1837 Joes first complete flight Ehe Nationals John Holliday came third also using borrowed plane 15 Carrier eight contestants Art Johnson able squeak out win over Glen Simpson score 1912 Glens 1911 Roy Ward third score 1686 would like encourage attend next years Nationals find Junior Senior contestants compete * Old TimerlBaker Continued page 158 sailplaner simply adds weight ballast doesnt work Old-Timer sailplanes because such designs have high drag Drag increases square increase speed Therefore add weight high-drag ship attempt improve its penetration penalized big increase drag small gain speed going hit fence get back far course added weight also hinders climb glide Youre probably wondering whether big lifting airfoil-section stabilizer doesnt help hold model up Naw Theres no free lunchno lift drag Glide improved CG 30% stabilizer lifting way lifting stabilizer benefits free flight model controlling pitch trim change between power-on power-off Controllability lesser concern selecting RC Electric Event 618 Any design should steer fine rudder elevator know nothing rules prevents use ailerons spoilers camber-changing flaps would likely get unpopular fast same time older designs large fins spell quick death high-powered free flight might have some edge RC event general think locating CG forward free flight position about 10% chord will improve controllability lifting-stabilizer design free flight position CG isnt shown plans use formula graph article Bogart Rhodes January 1959 Model Airplane News reprinted Frank Zaic Yearbook 1959-1961 So looks pretty good Strato Streak Interceptor Event 618 thin flat-bottom airfoils should IEI BILL WINTERS RIC SPECIAL Bills latest design offers rock steady stability solid realistic flight performance Special design concept originated 1947 publicity Mechanics Illustrated 1948 over years has evolved optimized flyer new specially designed semi-symmetrical airfoil contributes smoothness response behavior aspects its air worthiness Special fully aerobatic yet offers broad spectrum performance speeds Optional flaps 4-5 channel radio 45-50 twocycle 46-60 four cycle 40-60 electric 61 span 642 sq area 5-6 lbs flying weight Diamond airfoil stabilizer * FEATURES Tempered aluminum landing gear ABS molded cowl hardware package full size rolled plans photo illustrated step-by-step instructions windshield window material accurately machine die cut selected balsa spruce plywood flexible steel cable ailleron control IPAVEY675 TOWER LANE YSTEMS WEST CHESTER PA 19380 oRPoRATIoN 215-430-8645 outpenetrate Playboy Playboy isnt good floater fact low-wind day would hard beat contests flown under ideal conditions Other designs deserve serious considerationthe Miss America example designed Frank Zaic Scientific Models design has four longeron box fuselage Clark-Y airfoil nonlifting stabilizer Although cabin has windshield windshields slope manages preserve much profiles integrity negative see draggy landing gear goes trade-off compromise name game wonder Frank ever flew Miss America one-wheel gear real worldthat 1991 NationalsJerry Smartt won Event 618 Cleveland Viking Viking has four-longeron cabin-style fuselage nonlifting stab think lowest weight models listed Frank Kormans coverage event Most competitive models weighed about 45 oz Jerrys 37 oz Jerry used largest propeller listed fliers competing day won means very high current draw could have made absolutely vertical climb Jerry also used 650-mAb cells short motor run theres no need carry weight 900- 1200mAb cells important use larger diameter C-cell size high-current cells 5CR rather pencell-diameter 800mAh AR cells havent told what build Ive given facts base logical decision compromises trade-offs possible theres no reason should fly same design Designs unlikely win SAM free flight events should competitive AMA Class Old-Timer event SAM event Electrics way seems gaining support slowly AMA event think because rules limit performance too sharply Folding propellers prohibited lowperformance 800-mAh AR battery pack must usedthis despite use 90second motor run differences rule making procedures probably guarantee two events will evolve different directions way Playboy set up relaxed sport flyinginexpensive ferrite motor 800-mAh AR cells 31 MAS gearbox long slow motor runit does use 11 x 8 folding propeller can get back upwind Continued page 184 November 1992 161 1 IJill Electric Vacuum Bagging System Foam Core Wings $74 95* Complete Easy Use Add sppng & hondsg cdornio residents add sales tax Send $300 infomotion pockage Dealer Inquiries Invited VISA nnrl Mcxtnyirc1 Antrc1 Old-TimerlBaker Continued page 161 What SAM RC events glowpowered engines ignition engines suggestion improvement penetration would enhanced using design Clark Y airfoil nonlifting stabilizer Its possible however lifting stab helps control extreme pitch trim change accompanies high power levels offsetting its otherwise negative effect performance SAM free flight Stick what works well-known models use proven formula small fin large lifting stabilizer aft CG location large dihedral Use lot power Quaker Log Cabin Miss America probably wont able control power other hand models make fine RC ships word scaling down model really isnt hard pencil paper calculator Nowadays though us simply go photocopy shop say want reduced 73% find reduction enlargement factor Take square root wing area desire divide square root wing area shown plan resultant multiplication factor Multiply factor linear dimensions original plan create new larger smaller plan As look AMA rule book shows other RC Electric events flown too include Class Bin battery pack must have seven less 30 sand events pre-1960 free flight designs latter have unfortunately called oldie designs good names taken term nostalgia avoided fear might confused Nostalgia events National Free flight Society [NFFS] rose other name. What find interesting three ways compete Besides Limited Motor Run LMR events can enter Battery Allotment Texaco events Battery Allotment competitors required make three flights recharging Texaco have unlimited motor run single battery pack Both variations would require changes propeller battery pack gearinglots things offhand Id think youd want use same designs LMR events Wait minute Come think theres no need climb fast Hmmm scale kits engines accessories want & want em now got emFrank Tiano .boat car kits hardto-find pails & anything need want.its stockJoe Manzella SHIPPED WITHIN 24 HRS 1387 N Military laD West 688-0669 HOBBY SUPER OIUflb ABRLDS BIGGEST SCALE PLANS ASERVICE 70000 BI7sA0 PI7t8O8 08 SOSSA 07 SCALE NOBEL PLANS B88d I, 5. 511gb, UC,, [__ ___ 100 PATE CATALOG 50 aLE P1aa a, Pa oro S VIcE PLANS ENLARGING SUBO Madison AVS BsonsaAo SC 27050 SCALE OOCUMESTATION Z BISIASB5029

You cant judge track records SAM FF events predict what designs will beat out competition AMAs RC Electric Event 618 U Bill Baker ELECTRIC POWERED RC flying fast growing popularity more contests fun-flys scheduled club regional calendars 1991 category offered first time AMA National Aeromodeling Championships See Frank Kormans fine report November 1991 Model Aviation Jerry Smartts Cleveland Viking won RC Electric AMA Event #618 1991 Nationals Viking weighed 37 oz Jerry Smartt photo popular event seems Class Sailplane event No 610 event restricts battery pack maximum seven Ni-Cd cells Class Sailplane flown 1991 Nationals 30-second motor run 8-minute maximum flight time points landing inside designated area 152 Model Aviation y smarti used dummy gas engine Brooklyn Dodger ballast help CG problem caused lots wood aft fuselage Frank Korman photo Probably second popularity club contests AMA Event No 618 Class Old-Timer Limited Motor Run event intended pre-1943 designs motor run increased 40 seconds Otherwise Class Old-Timer used same rules Class Sailplane 1991 Nationals purpose article twofold analyze what makes Old-Timer design competitive event 618 identify models desirable characteristics Please understand rules event differ used Society Antique Modelers SAM events General remarks selecting designs SAM events appear later article noncompetitive flier can happy flying design appeals him Maybe has got some roots design maybe just likes way looks want win contests though emotion alone wont winning goal have think logically Early free flight gas designs large low-powered very stable During 1930s 1940s climb got faster engine run shorter designs changed rapidly stay competitive win free flight needed model high ratio power weight low ratio weight wing area design configuration could handle large trim changes between power-on power-off early designs center-ofgravity CG about 30% MAC mean aerodynamic chord large rudders nonlifting stabilizers relatively large mber 1992 153 Left Frank Korman wins contest Strata Streak Jake Hamilton awards trophy Right Franks Strato Streak aka Electromoose up close Note elevator side tiny rudder Korman photos Jay Burkart won 2nd event 618 91 Nationals Astro cobalt FAI 05-powered Playboy Korman photo appearance f characteristics performance make man love airplane told truly what put emotion love lot things live around isnt woman isnt horse nor before nor after lovely great airplane men love faithful though leave others . Ernest Hemingway Left Jerry Smartt L Bill Jenkins Cleveland Vikings Right Tom williams uianoma City UK flew fli5 45-oz Lanzo Bomber third place Event 618 91 Nationals used seven 1200-mAh cells Korman photos angles positive incidence between wing stabilizer free flight folk call decalage Under high power models simply went nuts either spiral diving looping themselves death satisfy requirement faster climbs shorter engine runs free flight gas designers introduced large airfoilsectioned lifting stabilizers small fins large lifting stabilizers accomplished two things dictated CU moved aft typically 50% 75% chord reduced decalage arrangement made model vulnerable dreaded spiral drive spiral diving could usually kept within tolerable limits reducing rudder area point producing Dutch roll Before long competitive designsZippers Interceptors Strato Streaks various derivativeshad eclipsed sort-of-looks-like-a-realairplane predecessors Wouldnt Zipper Interceptor competitive AMA Event 618 Well could worse Remember though RC Electric event different requirements say modem-era SAM free flight events Designs unlikely win latter events could prove competitive superior RC events Hey could use some variety contests once threatened take two photographs Playboy Lanzo Bomber cover SAM Champs RC events enlarging reducing other suit class being flown hasten add Old-Timer presently have ready fly Playboy love love Bomber too models competitive betcha Still doesnt keep considering other designs next model Event 618 emphasizes duration short motor runeight minutes long time fly 40 seconds climb 1991 Nationals points also awarded landing designated area couldnt come back upwind land near area launch lost points Four performance factors affect models success eventclimb glide controllability penetration glide speed Lets examine turn Climb increase climb rate primarily increasing ratio power weight get lots power short time 7 place large loads geared motor drawing current seven-cell battery rate 40 amps brings nominal 05 motors usually flown about 120 watts 17 amps x 7 cells power up 280 watts power 40 amps x 7 cells 154 Model Aviation e Kirk Massey Ollie adapted design published 1951 Air Trails article Right Kirk launches Ollie annual New Orleans Electric meet Photo Ben B Mathews Jr Above Jack Phelps electrified Ed Lidgard HiHo pre-1943 rubber-power design Right MAs Harry Murphy looses gas-powered Zeek NosGas meet Bill Baker photos Below Mike Finnans Candid John Pond plans Light low-drag ship gets lots power Astro FAI cobalt 05 Right Kirk Massey sells full-size plans Ollie PO Box 496 Willis TX 77378 Ben B Mathews Jr photos Continued page 157 motion bomb falls nearly straight down planes disqualified flying lower 100 feet accuracy about same models about half bombs landed circle full-scale carrier landings also much like Some pilots tried too hard touched down rather heavily fewer bounces Jo Jo Sheble made excellent two-point landing Piper Cub Touching down circle just past line Jo Jo came full stop big cloud lime dust Cubs tail held up off ground propwash wagged elevators crowd continued Naturally everyone cheered John Armentrout came roaring Decathlon five feet smoke Ive never close smoke trail before Diesel trucks seem clean odorless comparison Student pilot Joan McCoy impressed instructor won first place bomb drop eventgood $250 aviation fuel donated Air Petroand tied second An excellent Mexican barbecuerice beans makings giant burritosbegan 1100 am Iced tea apple turnovers also served * Old TimerlBaker Continued page 154 Astro cobalt motors will stand load short runs dont think youd want run five minutes level Fliers 1991 Nationals achieved power increase using propellers diameters up 14 11-in prop youll seldom exceed 20 amps Low weight Okay takes care high power about low weight Two factors involvedairframe weight other stuff First other stuff radio receiver servos etc must light need on/off controller brake stop propeller might consider battery eliminator circuit BEC well Jomar High Sky both make on/off controller BEC Ive using Jomars recently like also like older High Sky device BEC Id expect new version work well too Though controller BEC about ounce lighter BEC ounce can make difference event comes airframe weight design itself critical wood selection Some designs simply call woodmore pieces parts weight can reduce weight limited extent using low-density wood strength considerations allow longerons spars leading edges need tough classic box fuselage exemplifies lightweight airframe design Its hard get lighter four-longeron box Add lots formers stringers add weight As Hank Struck put years ago Simplicate add lightness Take Goldberg Sailplanea mber 1992 157 spot landing Besides Joans firstplace prize trophies awarded third place both events Electric F ight Lighteneight 12 oemoney back Adjustable switching point Solderless terminal easy hookup ON OFF Controller $2995 Power save weight Veiy high efficiency 006V laos 20 Size 22xt2x63 Add $100 toe shipping Colifonio rwidorns add 72500 $217 Tee Send Check money order conies willyHigh Sky rnaoha esesecior3929 Kansas St #9 oth~oeeSan DiegoCA 92104 PVFC/SIOAl BUILT oniy name promise U F 1 Winning designs 1990 TOC 1st 2nd 3rd 5th ULTIMATE LASER 200 really caii fly better wfth better built airplane PRECISION BUILT INC WY 281 N BRANCH X 78070 $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/G REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE top champions purchase Precision Built models 2 lightest airtrames available ModeLs Available EXTRA 260 STEPHENS AKRO 512 438-3330 2-wheel gear 1 ycles 1 7995 includes amplifier CONTROL w Kraft Midwest Inc 115 E Main Norchville MI 48167 313/348-0085 fl Fax 313/348-4175 wonderful design tends get heavy scale down original size about 72-in span probably about 900 sq wing area Sailplane can handle lot power flew white-case McCoy 60 making highly competitive free flight scaled wing area down say 550-600 sq seems about right 40-secondmotor-mn event youd have hard time compensating extra pieces using low-density wood can want know buy wood Other designs too parts scale down light Hemy Struck-designed New Ruler Zipper Playboy Strato Streak Lanzo Bomber other hand scale down fine low parts count makes easy build light Thats Strato Streak dominated 02 Replica free flight Though Playboy has four main longerons four assistant longerons using softer wood keeps weight down Glide factors benefit aircrafts glide fairly complex major ones low wing loading low dragbut low weight greatest importance smaller model gets lower wing loading has to match original glide large cross section Old-Timer designs promotes tendency high drag Although some designs featured cleaner lower-drag fuselages landing gears wheels some airfoils high drag along high lift Some models one-wheel landing gear others single-wheel retractable gear What about airfoils Should airfoil flat-bottom undercambered thick thin critical factor probably mean camber line High-camber airfoils fly slowly may have very low sink rate power however drag increases rapidly slowing climb reducing ability penetratethat glide back upwind Obviously trade-off factors involved might choose Clark Y-type alrfoil flat-bottom raised entry example over deeply undercambered type used Playboy Goldberg Sailplane sacrificing bit sink rate sake better climb penetration Thats whats fun about designing airplanes selecting among older designsthe choices compromises crade-otfs make model bigger glide better give up some glide better climb rules should change shorten motor run foresee swing greater emphasis climb less emphasis glide Penetration low drag aerodynamically clean modern RC Sailplane makes craft seem almost frictionless moves through air increase penetration windy days speed task modern Continued page 160 158 Model Aviation KMI ULTRA AM RECEIVER y KMI RETRACTS Cs COMPETITION ENGINES CSG048NORMALABC29KRPMREG CSG049SPEEDABC55KRPMREG CSG061NORMALABC27KRPMREG CSG061SPEEDABC35KRPMREG CSG09NORMALABC27KRPMREG CSG09SPEEDABC35KRPMREG NEWCSGuNABC27KRPMREG CSGISPSPORTSBB18KRPMREG CSG15NORMALABC27KRPMREG CSG15SPEEDABC37KRPMREG CSG15SPEEDMC37KRPMREG NEWCSG1SABCCOMBATSPECIALREG CSDI 5Th MC TEAM RACEDIESELREG CRC TEAM RACE CARBURETOR FOR I5TR REG CSG21SPEED ABC29K RPMBEG CSG21NMARINE ABC28K RPMREG CSG6022 ABC 2 TO19K RPMREG CS1TUNED PIPE 049-061REG C59TUNED PIPE 09REG C52TUNED PIPE 15-2160REG CSHGLOWPLUGS FOR CS ENGINESREG CSRSPEEDPAN 040-06109REG CSWSPEEDPAN 1 5-21REG $142SALE $149SALE $142SALE $146SALE $137SALE $142SALE $140SALE $ 55SALE $129SALE $139SALE $140SALE $145SALE $169SALE 55 SALE S139SALE $149SALE $155SALE S 20SALE 31SALE 39SALE 390SALE 39SALE 54095 SALE ALL ENGINES ARE TEST RUN BEFORE THEY LEAVE THE FACTORY QUALITY OF WORKMANSHIP-GUARANTY 049 Normal First Place 049 Speed First Place 21 MARINE & 60 2X2 COME WITH CARE ALL OTHER ENGINES EXCEPT 15 TR COME WITH UC VENTURI & NEEDLE VALVE ASSEMBLY 1/2 & 15 ENGINES COMES WrTH BUTTONHEAD TYPE GLOW PLUG ALL ENGINES EXCEPT 1 5P-1 SIR &60 COME 04TH ALUMINUM SPINNER THE 21 N HAS GROOVE FOR BELT START NEW RACE 160 AFTER RUN OIL REG $399 INTFE SALE 5249 CSG CSG US Nationals CSG 60 First Place PARIS WORLD CHAMPIONSHIPS $12950 $13650 $12750 $12906 $11950 $12450 $12259 $4975 $11150 $12150 $13150 $12775 $15775 $5075 512150 Si 31 50 $14175 $2775 $2975 $3775 $ 375 $ 3575 $4150 CS PULSE JET ENGINES VALVELESS STAINLESS STEEL RUNS ON REGULAR GASOLINE 5/P 1 20 LBS THRUST $10075 0/P 1 LBS THRUST $21575 NEW AT AERO ENGINES LTD ITALIAJ4 PRECISION AT AFFORDABLE PRICES CIPOLLAtS P/C W/ MUFFLER $0450 120 41 ISV R/C 4 CYCLE $26450 SEND MAIL ORDERS TO YOUNGSTERS SPECIAL1viI-CJISUJH NEW RUSSIAN 049 UC GLOW 54975 2014 BUCKLEY AVE MUST BE UNDER 1 B YEARS OLDPOR THIS E WORTH Pt 33401 SPECIAL PLEASE!ftI I.4075056150 PROM 6PM TO 9PM ADULT PURCHASE PRICE$SB75 EXCLUSIVE Cs DISTRIBUTOR DEALER INDUIRIES INVITED CHARGE IT II SEND 5050 OR SOIFFING & hANDLING COO ADO 9300 Must have expiration date Master Charge bank numbe F OASANESOETSAOSO%SALESTAItCHEDORMONEYOROEN 160 Model Aviation 4CL CarrierlJohnson Continued page 84 Johnson scored personal high 2295 Joe JUSt using borrowed Sig Skyray powered McCoy 35 second score 1837 Joes first complete flight Ehe Nationals John Holliday came third also using borrowed plane 15 Carrier eight contestants Art Johnson able squeak out win over Glen Simpson score 1912 Glens 1911 Roy Ward third score 1686 would like encourage attend next years Nationals find Junior Senior contestants compete * Old TimerlBaker Continued page 158 sailplaner simply adds weight ballast doesnt work Old-Timer sailplanes because such designs have high drag Drag increases square increase speed Therefore add weight high-drag ship attempt improve its penetration penalized big increase drag small gain speed going hit fence get back far course added weight also hinders climb glide Youre probably wondering whether big lifting airfoil-section stabilizer doesnt help hold model up Naw Theres no free lunchno lift drag Glide improved CG 30% stabilizer lifting way lifting stabilizer benefits free flight model controlling pitch trim change between power-on power-off Controllability lesser concern selecting RC Electric Event 618 Any design should steer fine rudder elevator know nothing rules prevents use ailerons spoilers camber-changing flaps would likely get unpopular fast same time older designs large fins spell quick death high-powered free flight might have some edge RC event general think locating CG forward free flight position about 10% chord will improve controllability lifting-stabilizer design free flight position CG isnt shown plans use formula graph article Bogart Rhodes January 1959 Model Airplane News reprinted Frank Zaic Yearbook 1959-1961 So looks pretty good Strato Streak Interceptor Event 618 thin flat-bottom airfoils should IEI BILL WINTERS RIC SPECIAL Bills latest design offers rock steady stability solid realistic flight performance Special design concept originated 1947 publicity Mechanics Illustrated 1948 over years has evolved optimized flyer new specially designed semi-symmetrical airfoil contributes smoothness response behavior aspects its air worthiness Special fully aerobatic yet offers broad spectrum performance speeds Optional flaps 4-5 channel radio 45-50 twocycle 46-60 four cycle 40-60 electric 61 span 642 sq area 5-6 lbs flying weight Diamond airfoil stabilizer * FEATURES Tempered aluminum landing gear ABS molded cowl hardware package full size rolled plans photo illustrated step-by-step instructions windshield window material accurately machine die cut selected balsa spruce plywood flexible steel cable ailleron control IPAVEY675 TOWER LANE YSTEMS WEST CHESTER PA 19380 oRPoRATIoN 215-430-8645 outpenetrate Playboy Playboy isnt good floater fact low-wind day would hard beat contests flown under ideal conditions Other designs deserve serious considerationthe Miss America example designed Frank Zaic Scientific Models design has four longeron box fuselage Clark-Y airfoil nonlifting stabilizer Although cabin has windshield windshields slope manages preserve much profiles integrity negative see draggy landing gear goes trade-off compromise name game wonder Frank ever flew Miss America one-wheel gear real worldthat 1991 NationalsJerry Smartt won Event 618 Cleveland Viking Viking has four-longeron cabin-style fuselage nonlifting stab think lowest weight models listed Frank Kormans coverage event Most competitive models weighed about 45 oz Jerrys 37 oz Jerry used largest propeller listed fliers competing day won means very high current draw could have made absolutely vertical climb Jerry also used 650-mAb cells short motor run theres no need carry weight 900- 1200mAb cells important use larger diameter C-cell size high-current cells 5CR rather pencell-diameter 800mAh AR cells havent told what build Ive given facts base logical decision compromises trade-offs possible theres no reason should fly same design Designs unlikely win SAM free flight events should competitive AMA Class Old-Timer event SAM event Electrics way seems gaining support slowly AMA event think because rules limit performance too sharply Folding propellers prohibited lowperformance 800-mAh AR battery pack must usedthis despite use 90second motor run differences rule making procedures probably guarantee two events will evolve different directions way Playboy set up relaxed sport flyinginexpensive ferrite motor 800-mAh AR cells 31 MAS gearbox long slow motor runit does use 11 x 8 folding propeller can get back upwind Continued page 184 November 1992 161 1 IJill Electric Vacuum Bagging System Foam Core Wings $74 95* Complete Easy Use Add sppng & hondsg cdornio residents add sales tax Send $300 infomotion pockage Dealer Inquiries Invited VISA nnrl Mcxtnyirc1 Antrc1 Old-TimerlBaker Continued page 161 What SAM RC events glowpowered engines ignition engines suggestion improvement penetration would enhanced using design Clark Y airfoil nonlifting stabilizer Its possible however lifting stab helps control extreme pitch trim change accompanies high power levels offsetting its otherwise negative effect performance SAM free flight Stick what works well-known models use proven formula small fin large lifting stabilizer aft CG location large dihedral Use lot power Quaker Log Cabin Miss America probably wont able control power other hand models make fine RC ships word scaling down model really isnt hard pencil paper calculator Nowadays though us simply go photocopy shop say want reduced 73% find reduction enlargement factor Take square root wing area desire divide square root wing area shown plan resultant multiplication factor Multiply factor linear dimensions original plan create new larger smaller plan As look AMA rule book shows other RC Electric events flown too include Class Bin battery pack must have seven less 30 sand events pre-1960 free flight designs latter have unfortunately called oldie designs good names taken term nostalgia avoided fear might confused Nostalgia events National Free flight Society [NFFS] rose other name. What find interesting three ways compete Besides Limited Motor Run LMR events can enter Battery Allotment Texaco events Battery Allotment competitors required make three flights recharging Texaco have unlimited motor run single battery pack Both variations would require changes propeller battery pack gearinglots things offhand Id think youd want use same designs LMR events Wait minute Come think theres no need climb fast Hmmm scale kits engines accessories want & want em now got emFrank Tiano .boat car kits hardto-find pails & anything need want.its stockJoe Manzella SHIPPED WITHIN 24 HRS 1387 N Military laD West 688-0669 HOBBY SUPER OIUflb ABRLDS BIGGEST SCALE PLANS ASERVICE 70000 BI7sA0 PI7t8O8 08 SOSSA 07 SCALE NOBEL PLANS B88d I, 5. 511gb, UC,, [__ ___ 100 PATE CATALOG 50 aLE P1aa a, Pa oro S VIcE PLANS ENLARGING SUBO Madison AVS BsonsaAo SC 27050 SCALE OOCUMESTATION Z BISIASB5029

You cant judge track records SAM FF events predict what designs will beat out competition AMAs RC Electric Event 618 U Bill Baker ELECTRIC POWERED RC flying fast growing popularity more contests fun-flys scheduled club regional calendars 1991 category offered first time AMA National Aeromodeling Championships See Frank Kormans fine report November 1991 Model Aviation Jerry Smartts Cleveland Viking won RC Electric AMA Event #618 1991 Nationals Viking weighed 37 oz Jerry Smartt photo popular event seems Class Sailplane event No 610 event restricts battery pack maximum seven Ni-Cd cells Class Sailplane flown 1991 Nationals 30-second motor run 8-minute maximum flight time points landing inside designated area 152 Model Aviation y smarti used dummy gas engine Brooklyn Dodger ballast help CG problem caused lots wood aft fuselage Frank Korman photo Probably second popularity club contests AMA Event No 618 Class Old-Timer Limited Motor Run event intended pre-1943 designs motor run increased 40 seconds Otherwise Class Old-Timer used same rules Class Sailplane 1991 Nationals purpose article twofold analyze what makes Old-Timer design competitive event 618 identify models desirable characteristics Please understand rules event differ used Society Antique Modelers SAM events General remarks selecting designs SAM events appear later article noncompetitive flier can happy flying design appeals him Maybe has got some roots design maybe just likes way looks want win contests though emotion alone wont winning goal have think logically Early free flight gas designs large low-powered very stable During 1930s 1940s climb got faster engine run shorter designs changed rapidly stay competitive win free flight needed model high ratio power weight low ratio weight wing area design configuration could handle large trim changes between power-on power-off early designs center-ofgravity CG about 30% MAC mean aerodynamic chord large rudders nonlifting stabilizers relatively large mber 1992 153 Left Frank Korman wins contest Strata Streak Jake Hamilton awards trophy Right Franks Strato Streak aka Electromoose up close Note elevator side tiny rudder Korman photos Jay Burkart won 2nd event 618 91 Nationals Astro cobalt FAI 05-powered Playboy Korman photo appearance f characteristics performance make man love airplane told truly what put emotion love lot things live around isnt woman isnt horse nor before nor after lovely great airplane men love faithful though leave others . Ernest Hemingway Left Jerry Smartt L Bill Jenkins Cleveland Vikings Right Tom williams uianoma City UK flew fli5 45-oz Lanzo Bomber third place Event 618 91 Nationals used seven 1200-mAh cells Korman photos angles positive incidence between wing stabilizer free flight folk call decalage Under high power models simply went nuts either spiral diving looping themselves death satisfy requirement faster climbs shorter engine runs free flight gas designers introduced large airfoilsectioned lifting stabilizers small fins large lifting stabilizers accomplished two things dictated CU moved aft typically 50% 75% chord reduced decalage arrangement made model vulnerable dreaded spiral drive spiral diving could usually kept within tolerable limits reducing rudder area point producing Dutch roll Before long competitive designsZippers Interceptors Strato Streaks various derivativeshad eclipsed sort-of-looks-like-a-realairplane predecessors Wouldnt Zipper Interceptor competitive AMA Event 618 Well could worse Remember though RC Electric event different requirements say modem-era SAM free flight events Designs unlikely win latter events could prove competitive superior RC events Hey could use some variety contests once threatened take two photographs Playboy Lanzo Bomber cover SAM Champs RC events enlarging reducing other suit class being flown hasten add Old-Timer presently have ready fly Playboy love love Bomber too models competitive betcha Still doesnt keep considering other designs next model Event 618 emphasizes duration short motor runeight minutes long time fly 40 seconds climb 1991 Nationals points also awarded landing designated area couldnt come back upwind land near area launch lost points Four performance factors affect models success eventclimb glide controllability penetration glide speed Lets examine turn Climb increase climb rate primarily increasing ratio power weight get lots power short time 7 place large loads geared motor drawing current seven-cell battery rate 40 amps brings nominal 05 motors usually flown about 120 watts 17 amps x 7 cells power up 280 watts power 40 amps x 7 cells 154 Model Aviation e Kirk Massey Ollie adapted design published 1951 Air Trails article Right Kirk launches Ollie annual New Orleans Electric meet Photo Ben B Mathews Jr Above Jack Phelps electrified Ed Lidgard HiHo pre-1943 rubber-power design Right MAs Harry Murphy looses gas-powered Zeek NosGas meet Bill Baker photos Below Mike Finnans Candid John Pond plans Light low-drag ship gets lots power Astro FAI cobalt 05 Right Kirk Massey sells full-size plans Ollie PO Box 496 Willis TX 77378 Ben B Mathews Jr photos Continued page 157 motion bomb falls nearly straight down planes disqualified flying lower 100 feet accuracy about same models about half bombs landed circle full-scale carrier landings also much like Some pilots tried too hard touched down rather heavily fewer bounces Jo Jo Sheble made excellent two-point landing Piper Cub Touching down circle just past line Jo Jo came full stop big cloud lime dust Cubs tail held up off ground propwash wagged elevators crowd continued Naturally everyone cheered John Armentrout came roaring Decathlon five feet smoke Ive never close smoke trail before Diesel trucks seem clean odorless comparison Student pilot Joan McCoy impressed instructor won first place bomb drop eventgood $250 aviation fuel donated Air Petroand tied second An excellent Mexican barbecuerice beans makings giant burritosbegan 1100 am Iced tea apple turnovers also served * Old TimerlBaker Continued page 154 Astro cobalt motors will stand load short runs dont think youd want run five minutes level Fliers 1991 Nationals achieved power increase using propellers diameters up 14 11-in prop youll seldom exceed 20 amps Low weight Okay takes care high power about low weight Two factors involvedairframe weight other stuff First other stuff radio receiver servos etc must light need on/off controller brake stop propeller might consider battery eliminator circuit BEC well Jomar High Sky both make on/off controller BEC Ive using Jomars recently like also like older High Sky device BEC Id expect new version work well too Though controller BEC about ounce lighter BEC ounce can make difference event comes airframe weight design itself critical wood selection Some designs simply call woodmore pieces parts weight can reduce weight limited extent using low-density wood strength considerations allow longerons spars leading edges need tough classic box fuselage exemplifies lightweight airframe design Its hard get lighter four-longeron box Add lots formers stringers add weight As Hank Struck put years ago Simplicate add lightness Take Goldberg Sailplanea mber 1992 157 spot landing Besides Joans firstplace prize trophies awarded third place both events Electric F ight Lighteneight 12 oemoney back Adjustable switching point Solderless terminal easy hookup ON OFF Controller $2995 Power save weight Veiy high efficiency 006V laos 20 Size 22xt2x63 Add $100 toe shipping Colifonio rwidorns add 72500 $217 Tee Send Check money order conies willyHigh Sky rnaoha esesecior3929 Kansas St #9 oth~oeeSan DiegoCA 92104 PVFC/SIOAl BUILT oniy name promise U F 1 Winning designs 1990 TOC 1st 2nd 3rd 5th ULTIMATE LASER 200 really caii fly better wfth better built airplane PRECISION BUILT INC WY 281 N BRANCH X 78070 $9995 8 Ch 50 53 72 75 Mhz Dont scrap favorite AM KRAFT Heathkit Hobbyshack Royal Tower Hobbies World Engines other TRANSMITTERS SERVOS Upgrade latest AM technology proven design minisize dual conversion ultra narrow band reliability R/G REPAIRS KMI largest complete independent RIC repair center USA repair brands Send SAF complete price repair product information RCD-KMI 6 Meter EXCLUSIVE top champions purchase Precision Built models 2 lightest airtrames available ModeLs Available EXTRA 260 STEPHENS AKRO 512 438-3330 2-wheel gear 1 ycles 1 7995 includes amplifier CONTROL w Kraft Midwest Inc 115 E Main Norchville MI 48167 313/348-0085 fl Fax 313/348-4175 wonderful design tends get heavy scale down original size about 72-in span probably about 900 sq wing area Sailplane can handle lot power flew white-case McCoy 60 making highly competitive free flight scaled wing area down say 550-600 sq seems about right 40-secondmotor-mn event youd have hard time compensating extra pieces using low-density wood can want know buy wood Other designs too parts scale down light Hemy Struck-designed New Ruler Zipper Playboy Strato Streak Lanzo Bomber other hand scale down fine low parts count makes easy build light Thats Strato Streak dominated 02 Replica free flight Though Playboy has four main longerons four assistant longerons using softer wood keeps weight down Glide factors benefit aircrafts glide fairly complex major ones low wing loading low dragbut low weight greatest importance smaller model gets lower wing loading has to match original glide large cross section Old-Timer designs promotes tendency high drag Although some designs featured cleaner lower-drag fuselages landing gears wheels some airfoils high drag along high lift Some models one-wheel landing gear others single-wheel retractable gear What about airfoils Should airfoil flat-bottom undercambered thick thin critical factor probably mean camber line High-camber airfoils fly slowly may have very low sink rate power however drag increases rapidly slowing climb reducing ability penetratethat glide back upwind Obviously trade-off factors involved might choose Clark Y-type alrfoil flat-bottom raised entry example over deeply undercambered type used Playboy Goldberg Sailplane sacrificing bit sink rate sake better climb penetration Thats whats fun about designing airplanes selecting among older designsthe choices compromises crade-otfs make model bigger glide better give up some glide better climb rules should change shorten motor run foresee swing greater emphasis climb less emphasis glide Penetration low drag aerodynamically clean modern RC Sailplane makes craft seem almost frictionless moves through air increase penetration windy days speed task modern Continued page 160 158 Model Aviation KMI ULTRA AM RECEIVER y KMI RETRACTS Cs COMPETITION ENGINES CSG048NORMALABC29KRPMREG CSG049SPEEDABC55KRPMREG CSG061NORMALABC27KRPMREG CSG061SPEEDABC35KRPMREG CSG09NORMALABC27KRPMREG CSG09SPEEDABC35KRPMREG NEWCSGuNABC27KRPMREG CSGISPSPORTSBB18KRPMREG CSG15NORMALABC27KRPMREG CSG15SPEEDABC37KRPMREG CSG15SPEEDMC37KRPMREG NEWCSG1SABCCOMBATSPECIALREG CSDI 5Th MC TEAM RACEDIESELREG CRC TEAM RACE CARBURETOR FOR I5TR REG CSG21SPEED ABC29K RPMBEG CSG21NMARINE ABC28K RPMREG CSG6022 ABC 2 TO19K RPMREG CS1TUNED PIPE 049-061REG C59TUNED PIPE 09REG C52TUNED PIPE 15-2160REG CSHGLOWPLUGS FOR CS ENGINESREG CSRSPEEDPAN 040-06109REG CSWSPEEDPAN 1 5-21REG $142SALE $149SALE $142SALE $146SALE $137SALE $142SALE $140SALE $ 55SALE $129SALE $139SALE $140SALE $145SALE $169SALE 55 SALE S139SALE $149SALE $155SALE S 20SALE 31SALE 39SALE 390SALE 39SALE 54095 SALE ALL ENGINES ARE TEST RUN BEFORE THEY LEAVE THE FACTORY QUALITY OF WORKMANSHIP-GUARANTY 049 Normal First Place 049 Speed First Place 21 MARINE & 60 2X2 COME WITH CARE ALL OTHER ENGINES EXCEPT 15 TR COME WITH UC VENTURI & NEEDLE VALVE ASSEMBLY 1/2 & 15 ENGINES COMES WrTH BUTTONHEAD TYPE GLOW PLUG ALL ENGINES EXCEPT 1 5P-1 SIR &60 COME 04TH ALUMINUM SPINNER THE 21 N HAS GROOVE FOR BELT START NEW RACE 160 AFTER RUN OIL REG $399 INTFE SALE 5249 CSG CSG US Nationals CSG 60 First Place PARIS WORLD CHAMPIONSHIPS $12950 $13650 $12750 $12906 $11950 $12450 $12259 $4975 $11150 $12150 $13150 $12775 $15775 $5075 512150 Si 31 50 $14175 $2775 $2975 $3775 $ 375 $ 3575 $4150 CS PULSE JET ENGINES VALVELESS STAINLESS STEEL RUNS ON REGULAR GASOLINE 5/P 1 20 LBS THRUST $10075 0/P 1 LBS THRUST $21575 NEW AT AERO ENGINES LTD ITALIAJ4 PRECISION AT AFFORDABLE PRICES CIPOLLAtS P/C W/ MUFFLER $0450 120 41 ISV R/C 4 CYCLE $26450 SEND MAIL ORDERS TO YOUNGSTERS SPECIAL1viI-CJISUJH NEW RUSSIAN 049 UC GLOW 54975 2014 BUCKLEY AVE MUST BE UNDER 1 B YEARS OLDPOR THIS E WORTH Pt 33401 SPECIAL PLEASE!ftI I.4075056150 PROM 6PM TO 9PM ADULT PURCHASE PRICE$SB75 EXCLUSIVE Cs DISTRIBUTOR DEALER INDUIRIES INVITED CHARGE IT II SEND 5050 OR SOIFFING & hANDLING COO ADO 9300 Must have expiration date Master Charge bank numbe F OASANESOETSAOSO%SALESTAItCHEDORMONEYOROEN 160 Model Aviation 4CL CarrierlJohnson Continued page 84 Johnson scored personal high 2295 Joe JUSt using borrowed Sig Skyray powered McCoy 35 second score 1837 Joes first complete flight Ehe Nationals John Holliday came third also using borrowed plane 15 Carrier eight contestants Art Johnson able squeak out win over Glen Simpson score 1912 Glens 1911 Roy Ward third score 1686 would like encourage attend next years Nationals find Junior Senior contestants compete * Old TimerlBaker Continued page 158 sailplaner simply adds weight ballast doesnt work Old-Timer sailplanes because such designs have high drag Drag increases square increase speed Therefore add weight high-drag ship attempt improve its penetration penalized big increase drag small gain speed going hit fence get back far course added weight also hinders climb glide Youre probably wondering whether big lifting airfoil-section stabilizer doesnt help hold model up Naw Theres no free lunchno lift drag Glide improved CG 30% stabilizer lifting way lifting stabilizer benefits free flight model controlling pitch trim change between power-on power-off Controllability lesser concern selecting RC Electric Event 618 Any design should steer fine rudder elevator know nothing rules prevents use ailerons spoilers camber-changing flaps would likely get unpopular fast same time older designs large fins spell quick death high-powered free flight might have some edge RC event general think locating CG forward free flight position about 10% chord will improve controllability lifting-stabilizer design free flight position CG isnt shown plans use formula graph article Bogart Rhodes January 1959 Model Airplane News reprinted Frank Zaic Yearbook 1959-1961 So looks pretty good Strato Streak Interceptor Event 618 thin flat-bottom airfoils should IEI BILL WINTERS RIC SPECIAL Bills latest design offers rock steady stability solid realistic flight performance Special design concept originated 1947 publicity Mechanics Illustrated 1948 over years has evolved optimized flyer new specially designed semi-symmetrical airfoil contributes smoothness response behavior aspects its air worthiness Special fully aerobatic yet offers broad spectrum performance speeds Optional flaps 4-5 channel radio 45-50 twocycle 46-60 four cycle 40-60 electric 61 span 642 sq area 5-6 lbs flying weight Diamond airfoil stabilizer * FEATURES Tempered aluminum landing gear ABS molded cowl hardware package full size rolled plans photo illustrated step-by-step instructions windshield window material accurately machine die cut selected balsa spruce plywood flexible steel cable ailleron control IPAVEY675 TOWER LANE YSTEMS WEST CHESTER PA 19380 oRPoRATIoN 215-430-8645 outpenetrate Playboy Playboy isnt good floater fact low-wind day would hard beat contests flown under ideal conditions Other designs deserve serious considerationthe Miss America example designed Frank Zaic Scientific Models design has four longeron box fuselage Clark-Y airfoil nonlifting stabilizer Although cabin has windshield windshields slope manages preserve much profiles integrity negative see draggy landing gear goes trade-off compromise name game wonder Frank ever flew Miss America one-wheel gear real worldthat 1991 NationalsJerry Smartt won Event 618 Cleveland Viking Viking has four-longeron cabin-style fuselage nonlifting stab think lowest weight models listed Frank Kormans coverage event Most competitive models weighed about 45 oz Jerrys 37 oz Jerry used largest propeller listed fliers competing day won means very high current draw could have made absolutely vertical climb Jerry also used 650-mAb cells short motor run theres no need carry weight 900- 1200mAb cells important use larger diameter C-cell size high-current cells 5CR rather pencell-diameter 800mAh AR cells havent told what build Ive given facts base logical decision compromises trade-offs possible theres no reason should fly same design Designs unlikely win SAM free flight events should competitive AMA Class Old-Timer event SAM event Electrics way seems gaining support slowly AMA event think because rules limit performance too sharply Folding propellers prohibited lowperformance 800-mAh AR battery pack must usedthis despite use 90second motor run differences rule making procedures probably guarantee two events will evolve different directions way Playboy set up relaxed sport flyinginexpensive ferrite motor 800-mAh AR cells 31 MAS gearbox long slow motor runit does use 11 x 8 folding propeller can get back upwind Continued page 184 November 1992 161 1 IJill Electric Vacuum Bagging System Foam Core Wings $74 95* Complete Easy Use Add sppng & hondsg cdornio residents add sales tax Send $300 infomotion pockage Dealer Inquiries Invited VISA nnrl Mcxtnyirc1 Antrc1 Old-TimerlBaker Continued page 161 What SAM RC events glowpowered engines ignition engines suggestion improvement penetration would enhanced using design Clark Y airfoil nonlifting stabilizer Its possible however lifting stab helps control extreme pitch trim change accompanies high power levels offsetting its otherwise negative effect performance SAM free flight Stick what works well-known models use proven formula small fin large lifting stabilizer aft CG location large dihedral Use lot power Quaker Log Cabin Miss America probably wont able control power other hand models make fine RC ships word scaling down model really isnt hard pencil paper calculator Nowadays though us simply go photocopy shop say want reduced 73% find reduction enlargement factor Take square root wing area desire divide square root wing area shown plan resultant multiplication factor Multiply factor linear dimensions original plan create new larger smaller plan As look AMA rule book shows other RC Electric events flown too include Class Bin battery pack must have seven less 30 sand events pre-1960 free flight designs latter have unfortunately called oldie designs good names taken term nostalgia avoided fear might confused Nostalgia events National Free flight Society [NFFS] rose other name. What find interesting three ways compete Besides Limited Motor Run LMR events can enter Battery Allotment Texaco events Battery Allotment competitors required make three flights recharging Texaco have unlimited motor run single battery pack Both variations would require changes propeller battery pack gearinglots things offhand Id think youd want use same designs LMR events Wait minute Come think theres no need climb fast Hmmm scale kits engines accessories want & want em now got emFrank Tiano .boat car kits hardto-find pails & anything need want.its stockJoe Manzella SHIPPED WITHIN 24 HRS 1387 N Military laD West 688-0669 HOBBY SUPER OIUflb ABRLDS BIGGEST SCALE PLANS ASERVICE 70000 BI7sA0 PI7t8O8 08 SOSSA 07 SCALE NOBEL PLANS B88d I, 5. 511gb, UC,, [__ ___ 100 PATE CATALOG 50 aLE P1aa a, Pa oro S VIcE PLANS ENLARGING SUBO Madison AVS BsonsaAo SC 27050 SCALE OOCUMESTATION Z BISIASB5029