Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk
Edition: Model Aviation - 1994/07
Page Numbers: 25, 26, 27, 28, 29, 30, 31, 32
Americas record buster did again article will reveal someone might make 11-pound model stay aloft 40-50 hours FAJ rules about radio controlled aeromodel records com plex really two technical rules strongly impact design record models 1 The model fuel shall weigh five kilo grams 11 pounds 2 The engine displacement powered models shall exceed 10 cubic centimeters 061 cubic inches used non-technical rule could significantly affect chances success 3 Assistant pilots permitted love first two rules sensible limit ing rules generate tough challenges fun creative work Its fun brag about too Hey made elevenpound hunk stay airborne equivalent shot whis key per hour Whoopee Theres no need imbibe can get drunk joy such achievements feelings about assistant pilot rule however very different interesting challenges technical first two questions would always hear after talking model club Rotarians 1 How stay awake long 2 Uh.uh.do drink coffee Uh.how you.you know.uh.manage to. point would usually relieve questioners embarrassment jestful explanation steer right hand less important things left hand Perhaps good function pilot rule generated humor As staying awake youd youd working toward goal year crashed rebuilt three four models hundreds hours help friends now hope success ad renaline flow makes impossi ble feel sleepy Headaches Yes get head aches sleepy switch No some new secrets about achieved latest re cords Some infor mation might help Sunday fun-fliers Engine Model engine ancient OS FS-60 very first four-stroke engine intro duced model hobby about Ive recently learned rule has changed Assistant pilots now allowed fly up 49% time Hooray Maynard Hill L John Patton descendant other record setters Old Faithful IV Site Pegasus RC Club field Hagerstown Maryland 1978 displacement 995cc just under 10cc allowed FAI rules engine has modified addition flywheel magneto Maloney 100 engine provide spark ignition supplied carburetor removed replaced OS 10 two-stroke engine Hundreds hours went testing carburetors engine modifications fuel mixture arrive fuel consumption figures ranged 12 ounces per hour mini mum throttle about 24 ounces per hour wide-open throttle WOT first record set July 4 1963 flight nearly doubled 7600 foot altitude record held Pietro Velitchkovsky Soviet Union Over next three decades set RC records cate gories piston-powered dura tion speed distance logged two soaring along way latest record nineteenth technical problems got tougher tougher new attempt Some suc cesses took year development testing crashing rebuilding process grooves brain got happily filled fascinating technical insight sorts stuff such magnetos bearings spark ignition noise lubrication long servo leads fuels flutter weather fore casting propeller efficiency vibration airfoils visibility stability BTUs microprocessors no-thank-you diesels etc like being asked about such stuff Ive got opinions explanations about everything technical Ask Ill expound 26 Model Aviation members gather landing spat record flight 24 hours four minutes 15 seconds June 4 1992 flight Scott Hill launches Old Faithful October 11992 Scotts jogging heave produces 25-mph launch What fuel Much information about fuels lubricants wear ignition systems car buretors fuel tanks etc appears articles about earlier duration records references end article Almost everything about engine fuel system same 1981 model new key factor two records Tien Seng Chius recommendation tried Coleman Camp Stove Fuel place automobile aviation gasoline said bums clean stove maybe would engine too Coleman fuel bums lot cleaner has little energy content has little lower density less critical needle setting Some flying spark-ignited engines gasoline might like try using regular percentage two-stroke oil Coleman stuff will run little longer make little power costs much doubt its worth sport flying lubricant record fuel again polyisobutylenea chemical used synthetic rubber lubricating hot alu minum tubing drawn through dies Amoco calls Indopol L-50 As explained reference 3 Don Lindley steered stuff because does crack car bon tar inside old 05 FS-60 after hundreds hours running Coleman PIB fuel looks almost run ning steam No carbon plug no tarnish sleeve piston Regretfully polyisobutylene solu ble alcohol cant make glow fuel mixes fine gasoline Coleman fuel exhaust forms nasty coating fuselage tail film resembles uncured epoxy resin both its stickiness its reluctance washed away Water detergents wont touch nor will alcohol have wash off gasoline short dont think anyone going make millions selling stuff fuel fuel mixture 114 fluid ounces Coleman Stove Fuel added 14 fluid ounces polyisobutylene make gallon 128 fluid ounces Please remember 05 FS-60 goes 3900 rpm WOT have no idea whether PIB could 36 I--J JIO & 10 r II 6 F7\ F FM Category F3A20 URATiON MODEL Record Flight Duration 24 Hr 4 Mm 15 Sec June 3 92 Dimensions inches L Designed Maynard L Hill lubricate 8000-rpm two-stroke monster propellers used record flights 16 x 10 wooden props purchased hobby shops recarved narrow bladed thin-airfoil types Both dimensions decreased about 30% think long span high aspect ratio good things propeller blades However have same conviction wing three-view drawing Figure 1 shows wing has 85-foot span 15foot chord has fat aspect ratio 562 structure typical free-flight few ribs lots skinny spars airfoil similar Clark Y profile flat bottom curved upward slightly section forward 30% point its thickness 15% chord French-curve airfoil draw new record model because can never find put draw ings earlier ones certainly have variations profile shape havent seen noticeable differences performances dont think airfoil shape very impor tant typical model airplane wing load ings anything will flyEpplers included wing ribs spaced five inches apart ribs have curves between over 90% wing area MonoKote covering formed twelve flat surfaces between spar bumps spars x a spar 30% chord has uniaxial graphite fiber epoxied top bottom completed wing MonoKote covering weighed 17 ounces result crash during several unsuccessful record attempts fuselage bridge-truss box made x -inch balsa longerons 3/is square struts diagonals fuselage empennage also covered MonoKote fuel tank 5 /2-inch diam eter x 7/i-inch-long cylinder made wrap ping /64 birch plywood around two balsa end discs balsa disc baffle middle July1994 27 Old Faithful IV uses french-curve air foil similar Clark Y All-up dry weight six pounds 10 ounces tank painted internally epoxy coated externally two ounces per square yard fiberglass check valve line engine crankcase pressurizes fuel tank forcing fuel forward floatchamber regulator just behind firewall all-up weight dry model fresh off drawing boardwas six pounds 10 ounces engine propeller alone weigh two pounds four ounces control system discussed below weighs 15 ounces airframe therefore weighed three pounds six ounces prior May 20 crash might expect would flimsy machine would bust pieces bumps lumps husky thermals survived tests included inside loops almost 3g steep dives speeds up about 75 mph As turned out strength needed during both record flights Control Telemetry systems integrated glob stuff serve receiver control system air data generator available commercially too complex inade quately documented describe build basic description may help enthusiasts develop simplified versions should wish try records other technical efforts Both hand-held control transmitter airborne receiver sections use Motorola MC68HC 11 microprocessors heart system control trans mitter operates ham band frequency 44200MHz transmitter generates special PCM code provide six channels proportional control discreet toggle-switched func tions turn wingtip lights engage solid-state Watson yaw-rate gyro pro vide wing leveling also toggle-switch command connects rudder servo output direction-finding DF receiver aboard model device steers model towards beacon ham band walkie-talkie 449MHz placed ground upwind control station DF working properly model circles over head necessary pilot keep eyes model time Sometimes however system cannot cope thermal turbulence other times winds too strong So best pilot has stand ready worst has eyeball steer model overhead Stand ready included rest ing chaise lounge sleeping bag didnt actually sleep airborne control unit consists FM receiver 44200MHz pair circuit boards two inches wide four inches long board contains MC68HC1 1 microprocessor altitude sen sor Honeywell PC 136 auxiliary EPROM 27C256 second board con sists special power supply micro processor generates pulse-width data servos accepts up six analog inputs onboard sensors can modu late servo positions Duration model three input ports usedone yawrate gyro altimeter direction finder sensors fitted analog signal-conditioning circuit provide 15V-35V signal needed input ports yaw-rate gyro highly filtered operates fixed gain such yaw rates 200 per second drive rudder full-left -right servo positions respec tively wing-leveling principle simple Any time conventional model yaws banks So drive yaw rate zero using gyro sensor model will automatical ly level its wings whenever neutralize control stick principle could useful trainer aircraft pilots seeking fly high far away Unfortunately helicopter-type rate gyros dont have enough gain smart electronics person could find ways beef em up Typically heli-gyros provide full servo slew yaw rates 1200 per second guess full-slew 2O30O per second would needed typical high-wing trainer gyro can installed activate rudder ailerons both usually works best ailerons rudder will model have no ailerons altimeter circuit uses Honeywell PC 136 absolute pressure sensor its raw input device somewhat temperaturedependent naturally has differing out puts due day-to-day variations baro metric pressure due altitude launch point Accordingly software routine has written within PCM code whereby press button transmitter can make altimeter read zero launch point Subsequently sensor reports altitude respect takeoff altitude also wrote software bring gyro output zero ton pushed Thus have worry about startup errors offsets often inherent lower-cost gyros power-supply board source 5V needed microprocessor EPROM gyro direction finder input power board supplied lithium battery Type PWR93D-V Electrohem Industries D-size cell 13 Ah capacity Open-circuit voltage 39 200 mA average rate used duration model delivers 36 28 Model Aviation Good friend mentor visited Maynard April 1992 24hour record flight still dream Scott Hill peers bottom ancient OS-FS 60 Modifications text Four servos Futaba Si 33 also battery move bit slowly due low 36 voltage thats okay because slow model entire air borne system servos receiver microproces sors transmitter blinking lights direction finder gyro could run about 60 hours four-ounce batter Incredible yes bad news theyre very expensivein iieighbor hood $70 eachand rechargeable Another problem output volt age sensitive ambient temperature 320F voltage 3V 200 mA load Preflight bench tests proven airborne electronics servos would work batteries reading 3V submerged ice water still scary encountered freezing tem peratures real world flight middle night telemetry system uses postagestamp-sized 20mw transmitter mounted vertical fin transmitter frequency two-meter ham bend 1465MHz FM modulated PCM data stream airborne microprocessor data stream received ground fed laptop computer Tandy 11 OOFD Radio Shack PCM data stream decoded via software written select display some important functions computer LCD data can stored floppy disc postflight analysis Table 1 list what displayed during record flights downlink ground equipment pow ered 2V gel cell will operate about five hours record flights con nected charger 1 lOV generator ground data system contained metal suitcase weighs about 15 pounds Flight Performance June 3-4 1992 launch weight both records about 1/ ounce less 11 pounds 5 kg allowed FAJ launch took place June 3 1206 pm temperature about 760F sunny sparse cumulus clouds model hand-launched climbed WOT about 400 feet minute gradually throttled back about 29% throttle produced about 3260 rpm model stayed 400 feet few minutes started ascent about 200 feet minute throttled back 16% lowest safe setting about 3080 rpm kept ascendingreaching 1200 feet about 10 minutes flight trimmed down ele vator until -18 showing comput er corresponds about 20 down trim model kept rising 1300 feet dur ing next minute could see about 100 dive attitude could also tell diving reading rpm rose normal level flight 3080 3480 thermal pushing propeller flew different parts sky looking some down within eyeball range sat 1300 feet dive another 10-15 minutes quite abruptlywithin about three minuteswe back down 300 feet neutral elevator 3200 rpm looking up found throttle gradually opened about 80% model struggled about 400 feet felt though model being squashed down onto floor 300 feet reckoned big bubble down above us bubble could go way ground ie turn horizontal wind Sure enough throttled back 28% again 3200 rpm model stayed 300 feet next 10 minutes white cruised part sky another looking up felt though magic car pet 300 feet altitude didnt like being low after got used didnt worry about model going lower rest afiernoon saw repeat performances behavior about half hour up down bubbles huge Id estimate least 3000 feet diameter took us 3300 feet -20 elevator full down trim finally NEED RIC ACCEssORIES FLY TO HITEC RCD FOR ALL YOUR ACCESSORY NEEDS 6 Y harness 7351# JIz 6 Buffered Y harness 7354# Li 12 Aileron Extension 7345# 24 Aileron Extension 7346# 6 Buffered Servo Conn 7356# zu m 9 Male Servo Conn 7342# 9 Female shown 7343# Switch Harness w/Battery & Clip 7215# uI Please specify connector type orderi ng Part #followed Airt J Fut S HitecIRCD & JR ALSO AVAILABLE 50 ft Bulk Servo Wire 3001 Rubber Ducky Antenna 1125 Flight Preserver wNelcro 8480 [iF hitoc RC 10729 Wheatlands Ave #C Santee CA 92071-2883 619 258-4940 July 1994 29 Table 1 take hold stick dive get back desired altitude 800-900 feet During descent saw -40 eleva tor prop windmilled up 3800 rpm glowplug engine probably would have blown out successfully tested aspect spark throttle prior attempts Still scary strong thermals Nighttime delight comparison about 8 pm throttle set 16% elevator neutral trim set tings produced airspeed about 22 mph zero sink speed dead air cold front moving area starting dusk observing wind shift 8 Flow Direction Only along gradual increase velocity Starting about 9 pm model ceased making racetrack loops downwind instead remained nearly still overhead though tied like kite beacon some nominal sideways mean dering owing cyclic inputs DF model stayed directly overhead about am June 4 wind built about 20 mph kite string stretched about 800 yards model hovering about 400 yards down wind control station distance beacon steady wind conditions sort self-regulated amplitude meandering ampli premium quality wood & foam kit containing hand cut balsa innd ply parts f cowl aluminum landing gear canopy foam wing cores rolled plans Extremely aerobatic yetof slow Span 55 Weight 175 1bs Area 1360 Length 63 Power G3&TI42 m similar Gasoline Check Valve Great Smoke Systems Made fuel proof Nylon Check Valve excellent use Gas Kerosene Smoke Oil Diesel Glow Fuel Gasoline Check Valve may used application requires way valve Gasoline Check Valve may used smoke systems fuel systems require maintenance tank pressure Gasoline Check Valve Product No FOR 150 Size 1/16 inch lD Price $495 FOURMOST PRODUCTS Look other great products Fourmost neareat hobby dealer direct ordera include $100 Shipping 404024th Avenue Foreat Grove OR g7116 tude diminishes model moves farther downwind because gain relationships DF control system 1 am change throttle 28% about 10 down trim elevator increased penetration speed model again hovered almost directly over control station until about 3 am During long steady-state hover about six hours model did stay constant altitude averaged about 800 feet cycled up high 1600 feet low 400 feet about 10 times during 10 hours suspicion something like standing waves being generated within so-called nocturnal boundary layer Wind ground about two mph whereas 20 mph aloft Thats boundary layer sure clearly velocity gradient nice smooth parabolic curve describes boundary lay ers textbooks About 3 am model started race track loop pattern typical wind aloft less about 15 mph beacon now moved southeast leav ing us little doubt cold front expected rain still way special receiver Hagerstown FAA weather kept remind ing us likely rain before noon IFR conditions expected effect Hagerstown before midafter noon Sunrise 543 peaceful period coffee session Egg McMuffins about 7 am sun clearly visible through thin haze layer until about 9 am magic hour 1025 am cheered ourselves past old record 22 hours 19 minutes held Gian Aghem Maria Molino Italy sky overcast ceiling about 6000 feet continued flight goal whole day 1206 pm June 4 pushed down-elevator control stick descended 800 feet speed well above minimum sink rate 1209 shut down engine made greasy deadstick landing spot about eight meters launch point Great shouts joy ensued rain started about hour later tank nearly half-full after 24hour flight engine excellent condition decided give another test October 1 1992 As precaution against cold weather added four ounces battery decreased fuel corre sponding amount model launched 533 pm Thursday October 1 expectation would fly about 40 hoursuntil day break Saturday morning opti mistic members crew hoping two whole days temperature dropped freezing dur ing first night little no wind ground aloft saw cvi30 Model Aviation SPECIAL Giant Sport its Best Intro Price $19995 List S2919 310 S&H NYS add 7% tax Reids Quality Model Products 16 Main Street Phelps New York 14532 Catalog $100 3155483779 American Made dence winds about 15 mphlong long racetrack paths distances difficult keep track blinking Christmas-tree lights As June periodic rise sink cycles up about 1300 feet down 400 feet Sunrise 705 am Friday Thermal activity started about 10 am afternoon hard time finding up easy time finding down updrafts seemed small diameter 300-400 feet fairly high velocity 200-300 feet minute full fine-scale turbulence down areas large diameters relatively smooth low velocity Horizontal wind stayed below about 15 mph throughout flight edges smaller thermals day tended bank steer model away cores DF system could cope severity some resultant turns frequent assistance pilot needed keep drifting away downwind sinking uncom fortable altitude sunset 659 Friday October 2 beautiful reasons its col ors Thermal activity stopped just before sunset again model settled long fairly reproducible racetrack pattern 1 am Saturday suspected close being out fuel because model felt light nearly full down trim elevator minimum throttle sitting 1200 foot average speed model well above normal knew wasting fuel experiences six unsuccessful attempts prior June 3 established hard rule Dont go below 16% throttle engine might stop Contest Director John Patton told timers could go cars nearby warm tent expected wed have about five-minute glide engine stopped guys going lose spite cold timers crew members stayed alert chairs under stars Wrapped frost-coated blankets hoods plastic sheets periph ery 40-watt lamp above computer guys like scene Dances Wolves wonderful display loyalty devotion brought tears eyes 230 am elevator full down trim throttle minimum now model sitting still higher 1700 feet virtually buzzing about sky told John Patton baby nearly empty think know Sure enough engine stopped abrupt ly 308 am aircraft about half mile away far end its down wind loops Pat hovering over computer screeched its panic beep beep beep Pat shouted Engine dead Engine dead son Scott duty watch track blinkers snapped searchlight immediately Two beams quickly added reflective tape wing tail came view eagle eyes half-frozen timers jumped out icy cocoons preparation touch down DF steered model back upwind arrived overhead about 500 feet altitude spare model spiraled down greasy landing 20 meters launch point Flashlights whipped onto chronographs reported new record 33 hours 39 min utes 15 seconds wasnt great riot joy chilled exhaustion 315 am crew felt some disappointment because failed reach 40-hour goal after couple hours sleep warm tent hearty breakfast warm restaurant became rational proudly proclaimed flight 332A hours indeed achievement failure postflight examination revealed fuel tank empty freak enforcement yet another Murphys Laws blocked critical air-bleed carburetor sometime during flight Consequently average fuel consumption about 17 ounces hour instead 13 ounces hour achieved during Juie 3-4 flight can never go wrong finishing model Hobbypoxy enamel paint Superior hiding power performance make Hobbypoxy sure winner time Nobody can beat winning formula Super-strong two-part epoxy enamel Can brushed sprayed Durable flexible Wont chip crack peel Stands up racing fuels water wear Adheres iron-films woven fabric iron-on coverings Matches films mixing 16 standard colors high gloss flat finishes Mixing formula chart military colors Hobbypoxy Custom Metallizer adds superb metallic lusters just coat second coat will put miles ahead competition Hobbypoxy paint model finish couldnt easier July 1994 31 free color chip card military mixing charts copy POXY POINTERS helpful guide using Hobbypoxy products call 1-201-625-3100 W r Absolutely Positively Bullet Prof 605DB 15TH x 078W x 161i 77 in/0z 16 Sec Also available 605MGmetal gear New Supreme Series llXt require Y harness utilize 8th channel heel 501 Customers wIll Order Supreme mesluer will recelee e FREE BulletPreul hell himec 05 U FUTABA 0 U FUTABA F U HITEC/JR U AIRTRONSCS 32 Model Aviation lo del SioS Inches WI Stall dOSES Type ServeS K x 01 s L 00 Torque 458 Speed 4 Summary Prognosis After cumulative run time 200 hours during preparation record flights engine still clean hardly worse wear control system companion telemetry has proven high ly reliable informative models aerodynamic performance could produce flight 50 hours FAI limited takeoff weight 11 pounds However have no intention milking model further will wallflower until someone passes 332/s hours now time build similar slightly larger ver sion see can make long-standing dream flying across Atlantic Ocean come true have high-tech dream scheme involv ing global position system receiver could steer model make beeline crossing about 40 hoursfrom whence cometh aforementioned goal like low-tech scheme better plan wonderful friends have helped set records over years going guests aboard large ocean going yacht St Johns Newfoundland load model up gas will lift launch over bow port set beacon fantail steam out harbor sit fantail yakking about model airplanes occasionally looking up see computerized albatross still up After eighty hours yachts top speed 22 knots land model Cork Ireland aint New York Paris across Atlantic Acknowledgements records would never have set help teammates Paul Howey Tien Seng Chiu son Scott Hill John Patton served Contest Director both flightsa task demanded incredible stamina patience Fellow DCRC Pegasus RC club members crewed officiated sweated froze Jack Anglin Charlie Calvert Don Clark Harry Gratten George Massie John Messano Bill Savage Wayne Simpson Joe Weaver freezing us know grateful am people Thanks guys great sorrow express belated thanks Don Lindley died May 26 1993 result automobile accident Don man enormous wit wisdom true friend gave much good advice over years about fuels lubricants References 1 Hill ML Beat Russians Bust Model Airplane News Vol LXXII No 7-8 July-August 1965 2 Hill ML Eleven Half Hours Exciting Boredom Flying Models #390 September 1969 3 Hill ML Twenty Hours Non-Stop Model Aviation Vol8 No7 July 1982 c RCD Does Once Again new 8 Channel FM supreme EXa SMALLER AglbNtT 7-eli RICe yet have 705MG liTAL ak tighter adjacent channel 20Hx 11Wx23L rejectionr higher 30SF rejectious & sensitivity Introductory 160 in/oz 27 sec Price $7995 RCD0 SPORT PACK ~YTYPPROPACK WAAAAACLECTRO unformanon dealer IANT F nearest call 619 258-4940 10729 Wheatlands Ave Suite C Santee CA 92071 05414 008at 517542 oz019 Sec 10414 08 018 175 t3ae 020 Sec 3E 283120 05 ul3 093 240 O205ec 320 11 021360 133 ae022 Sec 114 u 08 u 16170 43oe020 Sec K Ca3110 05 ut1 062 315z plot irfriI nfl iinlir nrinfrr requires VGA graphics BLEND different airfoils Trom wing root tip BROWSE through dozens airfoils ON SCREEN* Import VIEW airfoils other plot programs Enjoy point-and-click file selection loading Plot left-hand right-hand airfoils both $5995 Graphically modify airfoil shapes ON SCREENI* CA residents add sates tax Overseas orders US$65 Enter own data quickly easily or.Send Check Select hundreds airfoils available disk