Free Flight: Duration

NEW rubber winder Morrill Sidewinder II available last FF Duration guest col umn January 90 1 showed drawing Morrill Simpistooge winding stooge big winder hanging side very ca pable rubber winder now available new ver sion set up take high-torque winding stresses out other winders Sidewinder II looks same gears improved engineered scratch big-model rub ber winder suitable Wakefield Mulvihill really lot winder money spec sheet send SASE John Morrill Simplex 143 Richmond St El Se gundo CA 90245 simply mood order right now John prefers use dealers list Sidewinder II catalogs FAT Model Supply Ed Dolby OT Model Supply Ken Sykora Hobby Horn Bob Sliff Champion Models George Schroed ter Campbells Custom Kits Lee Campbell will glad ship Sidewinder II can put torque huge wad gumband new elastic fantastic bird Campbells Busy Bee mentioned Campbells Custom Kits Box 5996 Lake Worth FL 334610181 winder source also sup plier some best custom kits around Lee Campbell dyed-in-the-wool FFer knows just what put complete craftsman FF kit line runs high-performance ships like Dragmaster FIA Maverick /2A Souper 30 P-30 also has kit suitable beginner Free Flight Gas Bill Booth-designed Busy Bee Pee Wee 30 ship all-balsa great flier Cox Pee Wee 020 sleek lines FAT Power mod el ideal vehicle introduce neo phyte thrills FF Power Duration can assembled evening Hot Stuff Order friend5l398 Free Flight forever Perhaps 35 years ever long time keep photos Free Flight model column late last year Gil Endriga Palm Bay FL appealed FFers photos unusual tandem-wing Rubber model 80% stab flew out sight con test Philippines 35 years ago tube fuselage long motor dethermalizerbut enough bring down Manila ther mal Having sacrificed ship thermal god Hung Endriga hoping see once again photo since knew photographed meet Lo behold ex-wife Poah saw ap peal FF Duration sent him pair faded photos along Christmas greetings photos far too faint reproduce look closely can make out de tails design ahead its time Now over three decades later Endriga may use photo reference create nostalgia reproduc tion moral story Models never lost thermals just go Free Flight heaven Lil Cloud Sniffer Nostalgia Rubber plan creation Ed Lidgard dates Febru ary 1947 reproduced half-size plan can take copy shop get en larged twice-size Xerographic enlarging copier j..zizuzrzIz1z1zIz Il I LiTHRUST CHART / Electric IIIa Rubber, IFritz Mueller 1 /- /I i. j ITelco C0 MotarI iii~t 10 time seconds . 20 30 40 50 60 Relative power release three Free Flight power sources compiled researcher Fritz Mueller Before jumping Electrics CO2 would well consider relative weights 01 three systems Electric heaviest rubber lightest about cost 76 Model Aviation Free Flight Duration Dave Linstrum KAAU Project/Jeddah PO Box 8120 leddab 21482 Saudi Arabia International Free Flight pals Taft CA October 1989 Visiting Wakefield World Cham pion Bob White L-R Russian Andres Lepp Jean Bob White Ken Happersett Rus sians Alex Andrujkov Eugene Verbitski Glasnost thermals Photo Peter Alinut suns upand Linstrum launches Mulvihill Rubber ship into. dawns early light Events winner expert Bob White flying lightweight version Twin-Fin V 25 20 15 6 U C 1 4-i Author Dave Linstrum Taft CA fa mous model-flying site will soon occu pied federal prison Model Dawns Early Light Mulvihill lightweight bird Bob Meusers Dawn Mulvihill event de sign features rolled-tube fuselage geodet ic sliced wing tail ribs Mylar skin Its same model shown being launched previous page some unfathom able reason did win event Ed inspired create high flier fantasizing about thermals brushing dope nitrate side sheet / balsa brushed stroked sheet lazily really thinking dry curl formed Un dercambered airfoil little sanding cut ting shape great wing simple box body cutout sides A6-sq crosspieces/uprights developed Carl Goldberg Tissue-covered body model came out about ounce weight Ed used /2 oz T-56 remember rubber power plan self-explanatory hope will try flying ultra-high-tech FAI bird frustrating Mulvihill just seems like too much effort wind Enjoy sniffing clouds Silent-power comparisons Free Flighters like Ed Lidgard have traditionally preferred rubber power source new technology has brought great interest CO2 electric power Thumb Print newsletter Thermal Thumb ers Atlanta GA researcher Fritz Mueller charts relative energy release power sources present graph commentary Fritz might rubber could clearly see Ken Grubbs cranked few turns Mulvi hill let go ct used wind DC armatures living doesnt make expert Electroflight first 24-in model powered VL HY70 motor heavy fast Inertia problems arose batteries way back counterbalance motor up front Graup ner has another solution batteries motor gether near CG long shaft goes prop up nose Rubber CO2 Electric power sources has its own merits drawbacks Its anybodys guess three produces fun grief Some believe CO2 champ rubber twisters believe electric systems can beat mind made up toofor CO2 course argue simple test device can put together out sticks shafts clock gears springs counterweights fter week tinkering calibrating measuring came up three graph lines settle argument evoke new thoughts rubber cranked 600 turns footlong loop 6 FAI turning 7-in plastic prop CO2 used standard 28cc-tanked Telco throttled down slow 60-second run Elec tric source small MRC drive powered two 50-mAh Ni-Cd cells VL HY70 performs well total energy stored released propor tional surface gridded area under curve Count squares power get 70 C 0 iS \ \ \ V2 Z0 \ WE 0W uz UZ 4 z 0 0 z I- 0 i-s-. 4 0 5. 0 S p I0Z / II squares Rubber 91 squares CO2 236 Electric Multiply 5 get total thrust yield impulse grams per second 24 x 3/6-in FAt Rubber Standard Telco CO2 MRC HY7O Electric 350 grams/sec 455 grams/sec 1180 grams/sec Rubber looks bad comparison popular Simple rubber motor has lowest relative weight specified loop rubber shaft hook bearing weighs Continued page /87 / 'K4 J 1/ ~ (I II LL C4J1 uo 00 U 4 WAm lit II CE kJ4 uJ E Ia zi U May 1990 77 Ditectftom PATTERN TEE 320-ET uie Cteek Ct San Jo Ca 95125 Te14Ci298-Q3II Ft4Q829i-53S 1950s also Dmeco Sportwing moat Americans Building large Stuntwagon appealed time around dered set plans Fran Ptaszkiewicz began construction powered updated Stuntwagon Su perTigre 46 incorporated wing tip weight compartment adjustable lead-out guide trimming As OTS rules prohibit drop-off landing gear t added sheet aluminum gear Wagon presumably deBolt used later versions Modern glues hardware made better job could have managed back also used muffler pretty much unknown former days airplane finished off butyrate dope Im enjoying refly ing good old days working Stuntwagon thinking about vintage days Control Line Stunt par ticularly deBolt aircraft carried corres pondence Hal now living Florida re lated some history Dmeco Control Line projects Fran Ptaszkiewicz added information few nice letters Putting article together interesting fun help Mike Keville PAMPA newsletter editor OTS enthusiast able round up photos deBolt CL aircraft modelers across country After Hal Dmeco him shifted Control Line Radio Control activity came equally renowned top designer competitor arena Though better remem bered today achievements RC Hal will never lose standing influen tial designers competitors halcyon days Control Line modeling classic CL designs will flying long time come FlyWorm/de Vries Continued page 75 along inner tube walls ejected opening rear end outer spiral propulsion fins keep airstream whirling around outer tube surface sist propelling craft superpropul sion combination spiraling air cur rents both outside tubular wing angle tube placed line flight sustain craft atr COST elimination parts smaller size combination propul sion lift power principles unit structurally adapting itself mass pro duction should bring sales price aircraft within reach great majority people question mod ern factory equipment quantity produc tion price should compare cheapest automobile today Wouldnt have wonderful actually worked author wishes thank Jack Bol Denver CO sharing discovery FlyWorm certainly invention worth uncovering FF Duration/Linstrum Continued page 77 three grams perhaps fuselage must gram sturdier sustain torque whole drive system mere four grams Compare Telco full tank 15 grams MRC Electric 30 grams obvious model lifting heavy power source will climb less thus have less duration heavier motor less efficient ob taining time aloft will get weight effi ciency system dividing total thrust im pulse weight drive unit comes surprise rubber small models still king twice efficiency electricand mercymy favored CO2 drive limps behind last place beauty rubber motors lies fact torque weight duration can modified will suit individual application feel model should climb faster add few strands dont want increase weight shorten loops Infinite possiblilites exist within wide limits Efficiency 87% Electric efficiency 40% goes up Sanyo cells lighter regular Ni Cds Models limited size make mo tor CO2 efficiency 30% Telco compar atively smallthe thrust developed hardly enough keep 25-gram model level flight thrust up notch model will climb dead air flights including glide about minute picture changes rapidly larger CO2 motors brown MJ-70 displaces 70cc will keep 52-gram model aloft three minutes dead air Brown t40 twin two tanks beats rubber performance largest mo tor will run 6-in prop specified AMA rules Czech Modela Cox 020 CO2 Da vis conversion require much larger props can used AMA competition have slightly edited Fritzs remarks HANGAR-7 RIG & C/L MODELS Proffesional Neans Quality Results Cazaorsp1et IKvit PreCut AAA Raisa & Ply PrePonred Landing Gear Spruce & Maple Wood PuliSize Roiled Plans tsstructmons Wheels Controls Etc Inciuded 13 Plin~s Pls-a Kvit shove except 5CUI parts handy temptate sheet provided C PThnas Os-sly Fulisize rolled pians tesplate sheet instructions shipped rirot class sail Free Catalog $59 C $11 Rid CORSAIR 25 Distinctive Gull Wing Pavoritet SemiScale Wing Spant 4k Wing Arear 410 sq Sn Lengtht 341/2 LoadnE 5 Sq Pt Weigh 31/211 Onginet 25 o Sad 4Chasoe S A 7 C $7 tR/C HORNET 574 Spoda Wing Spant 27 WanSq25 Lnadingt il Sz/Sqna ueefl gee $ 13 $9 N/C r Wing Spon iI Wins areat 375 Sq In. Length 351/2 Weightt $39 13 $25 C $9 C/LI DROPIADER 4G nugnip Proflie Fuselage i guiltI Spant 55i/i Areat 540 Sq In. Enginet 40 $24 13 $15 C $7 39 13 S25 C 9 aprenaive Sight Profile Fuselage & RuiltIp Sheeted Wing Wing Spant 52 Areat 435 Sq Sn Enginet 35 Stunt ai~Y C/LI5 Lov Prof ile Fuselage & Soiid Raisa 05055 osog 293/5 Area 305 Sq Engine iS Cu C/LI tilfIE 5255 iS $ 2 2 Sport Piper/Tramoeoi guiltUp Sheeted Wings & Fuseloge Wiog Spant $ reat 200 Sq $7 Dealer Inquiries Invited ORDER YOURS TODAY Please add $4 shipping & handling Send check ar tooney order VISA & MC accepted Ojur street address kits pisese credit cards W STANGEL ENTERPRISES PO BOX 336 Pit t4i4 5484172 WAUKESHA WISCONSiN S31g70338 MEMBER EAA AMA May1990 187 Ideal 4-ycle F3A & AMA fl1ng Basic Ki Pre-tab -Beetle TMSuperStar 6 Basic -built Kit 1S2951 NEW Narukes Silent st 2 4-cycle Performance Specialties owned operated World Pylon Racing Champion Dave Shadel customize maintain majority high performance engines used todays racing enthusiasts addition work racing engines also repair customize OS Supertigre engines well providing warranty service repairs Bob Violett Models KBV 72 82 complete line Webra engines custom engines used some top aerobatic radng pilots world interested World Class performance please contact us weekday between 10 am 5 pm West Coast time Well look forward hearing Please send $100 descriptive brochure Visa & Msstercard accepted Aircraft Racing Headquarters PERFORMANCE SPECIALliES Custom ABC Piston / Cylinder Assemblies True Chrome Plating Higher Performance Longer Wear hrjbiwaueSpecEaII*a QUAJJW RADIO OON1L eIEU Available K&B 65 75 OS 40 VFNRP 05 61 FSR 05 61 VF 05 Long Stroke 61 Rossi 40 65 81 Supertigre X-40 YS 60 FS/FR YS Long Stroke Others Coming Soon Performance Specialties PO Box 4003 Carlsbad CA 92008 619 729-1658 can see favors CO2 know would have quite argument fellow Georgian Ed Lid gard Maybe wilt meet flying field George Perryman referee FF Scale/Warner Continued page 79 little lines seen end balsa sheets no growth rings would sheet say pine rapid growth rate balsa would give maybe ring 3-in-wide sheet lucky should know both virtue common sense having read Bob Meusers June 1976 Model Aviation ar ticle balsa Somehow t read su perb treatise feel deserves reprint nor used common sense little lines end sheet medul lars rays radiate center tree outward sheet cut rays parallel its top bottom surfaces C- cracker grain sheet rays connecting sur faces A- bendable grain anything tween would B-grain rays angle across end sheet next time someone confuses growth rings medullary rays show em have least read some books library set em right score Nylon screws years ago Royall Moore Mill River MA made up sold adjusting screw mechanism tt consisted length alu minum screw threaded block glued rear fuselage freely rotating foot glued trailing edge horizontal stabilizer made fine trim adjustments really easy late great Joe Bailey used same thing using small-diameter nylon screw youd like get some handy-dandy nylon screws other applications send dol lar SASE 45C postage Plenny Bates 2505 White Eagle Tr SE Cedar Rapids IA 52403 25 screws 2-56 fluster head deal As doing service guys might restrain yourselves clean him out $50 bill US Free Flight Champs move year 1990 will see world-famous annual Memo rial Day bash Taft move new location known Lost Hills bit further north cen tral valley California Sal Taibi says its better old site can half-hour flight still land field flat unencumbered trees bushes kitty litter factories can see model lands mile away Theres no nice soft green grassbut has dynamite thermals Balsa density Ever wonder what density wood about use next proj ect Most everyone know just hefts sheet pronounces its about six-to-eight pound balsa whatever designation re fers one-foot cube balsa size too may people use Paul Mcllrath has run across formula may help make things easier area Simply stated divide sheets 3 x 36 weight ounces its thickness inches just happens give its density pounds per cubic foot example sheet A-in thickness weighs 2 oz answer would 8-lb balsa FOR 3x36sHEETS ONLY WEIGHT IN OZ DENSITY IN THICKNESSLBS / CU FT IN INCHES4Neat quick works standard dimension stated ounces grams Keeping plans flat make straight air plane building over flat plan must Some guys go such lengths lay plate glass over plan build glass Cot Joe Dudzik Norman OK uses 3Ms Super 77 spray stick plans flat building board uses again stick waxed paper flat top plan didnt mention gets plan up again maybe isnt problem Joe says spray great making sanding blocks too Relations animal kingdom Dick ard Lake Havasu AZ reports Bruce Hol brook flying Peanut Prest Baby Pursuit powered four rubber motors driving prop through crank system attacked destroyed falcon Bruce flies kibbutz wheatfield Israel thats also wild animal pre serve 2-ft -span bird cut short Bruces minute-plus Peanut flight impact sounded like pistol shot Says Bruce Prests Styrofoam pilots eyes remain wide shock Mine too have seen bat chase Peanut flown under street light pigeon wipe out microfilm 188 Model Aviation Continued page 190 FaJcWUhItC.u5 1/4 Scale Kits $12995 Epoxy/Glass/Foam Construction Drawings Data Formuia 120 Pylon Sport Standoff ScalaKit Price ping Credit Cards WelcomedOhio Residents Add