Free Flight DURA TION Bob Meuser IN THE LEAD ITEM Januaiy 1984 column titled Strange configuration presented joined-wing concept al though didnt call invented Dr Julian Wolkovitch Shortly after publication issue before copy arrived received phone call Dr Wolkovitch later copy letter addressed Editor taking task aspects presentation Dr Wolkovitchs letter fol lows December 4 1983 Gentlemen Has life ever changed magazine article Bob Meusers account patented joined-wing configuration Model Aviation January 1984 spelled name incorrectly moved residence California Ohio inducted Air Force Worse yet almost technical statement article misleading wrong Because NASA US Navy several Universities aircraft manufac turers conducting extensive research joined wing promises aero dynamically structurally superior conventional wings must correct serious errors Mr Meusers article wind tunnel tests agricultural airplane design done NASA Air Force showed excellent aero dynamic characteristics NASA test re port Ref 1 predicts no problems full scale design Burt Rutan hasnt built full-scale because couldnt agree patent royalties because technical objections Bob Meusers drawing inaccurate airplane has unswept outer wings thick fin containing pilot shown photos published Aviation Week Ref 2 Joined wings have shown lighter stiffer conventional wing tail systems Ref 3 provided spars located near upper leading edge lower trailing edge As explained US Patent #4365773 gives depth resist loads acting perpendicular structural truss formed wings N 19 i ICondnsgt paper / / / / / -7 3 r M K~2 Typical hjir5c 1Jicjromt wing 3 34 Microjim 11 63 31s9ruct AWN Ir~85------Several joined-wing models have flown proper airfoil design washout front wing washin rear wing show good stability control tached photo illustrates quarter-scale model ultralight Longhorn will fly full-scale form 1984 Bob Meuser would like visit Palos Ver des CA Dayton OH would glad demonstrate him joined-wing model has exceptional flying qualities cludiong aileron-only turns flat glide safe stall/spin characteristics No joinedwing model kits plans yet available readers experiment simple sheet balsa models following principles explained references cited should able design own joined-wing air planes Sincerely s Dr Julian Wolkovitch References Ref 1 White E R Low-Speed Wind Tun nel Test Joined-Wing Agricultural Aircraft Model NASA Langley Research Center Report published 1984 Ref 2 Joined Wing Aircraft Planned Agricultural Applications' Aviation Week February 15 1982 p 144-145 76 Model Aviation Patrick Deshaye holds three four Indoor Ornithopter records Open category wild-looking model Bill Northrop maintains anything two wings better guess Bibitte proves hes right Deshaye Olympia WA also forming thopter enthusiast group Look information column Photo Joe Dvorak l3lt3lttEr Pcatrick PsIuze Mationat Records Indoor Optn Ornitkopter Cat II ef 3 Samuels M F Structural Weight Comparison Joined Wing Con ventional Wing AIAA Journal Air craft June 1982 sincerely apologize course spell ng Dr Wolkovitchs name wrong ticking him wrong town ir Force wish hed pecific said almost echnical statement article mis eading wrong Id like know ne got right have presume readers olumn interested Free Flight hile readers have other nterests may may include full ize aircraft speak Free Flight resented item sketch order ive Free Flighters general idea con ept little background ey might adapt concept own urposes three-view intended ive rough idea concept rather accurate representation particular airraft statement concept pplied proposed agricultural aircraft ooking somewhat like sketch essen ially accurate Note outer wing pan ls Dr Wolkovitchs RC model swept ack about like sketch shows although hose Rutan aircraft slightly wept back degree sweep evi lently essential concept cer ainly didnt intend say dont see hat did say imply anything effect hat full-size aircraft employing con ept wouldnt darned fine machine As regards stability control roblems entirely different full ze controlled aircraft naIl Free Flight models part e reason competition models dont ok anything like real aircraft Any Free lighter experimenting concept ould quick adopt whatever rudder Prtp irdia 34 pitch 2 / p area dihedral decalage CG position required make Free Flight model fly right stated bending rigidity wings didnt say bending thats what meant great trusslike appearance model front view might lead infer didnt mean wasn t probably lot better con ventional wing However placing spars Dr Wolkovitch recommends wouldnt much models thin Free Flight-type airfoil sections thing did realize until built simple cardboard model tremendous torsional rigidity joined-wing system provided roots wings chored something itself quite stiff perhaps good reason thick fin Free Flight model Getting sufficient tor sional rigidity real problem FF classes Nordic A-2 AMA Gas events old-rule Easy B low-ceiling Indoor Hand-Launched Glider name few short coupling approaching flying wing might give problems Free Flight applications Conceivably say low-ceiling IHLG could make coup ling shorter add con ventional tail boom tail must agree Hewitt Phillips 100% statement idea worth some experimentation will replace l6ng-tail-boom conventional configura tion competition Free Flight appli cations Still worth some experimenta tion should emphasized New ornitbopter record fine guy Patrick Continued page 167 vP 9 ----- 5 THIN MAN fob IZandolpk Record 3337 93 4 Zad TThk ioselyl cabin Indoor Cabin record-setter isa mIcrofIlm-covered disk see dangilng down under wing cabane aide vIew imented motor tube rubber motor completely enclosed motor tube next will lighter March 1984 77 Dr Julian Wolkovitch Inventor joined-wing concept Bob sketched January 1984 column Wolkovitch holds quarter-scale RC model ultralight design called Longhorn due fly lull scale during 1984 patent numbers concept 4365773 3942747 Bob has further comments potential modeling uses FF column 705% RADIO EQUIPMENT EXCHANGE Box 561 Park Forest Illinois 60466 List used radio equip ment sale No fee listing Escrow available Send SASE details 21 Old Time K HL Gliders 11 Contest Rubber Send 50C for4 Satellite Kits 82/83 catalog3 Nastalgia Power Pacifiers & LOTS OI GOCI StUFF FAIModel Supply II P0 Box 3957 ance CA 90510 GET ORGANIZED s set 01 4 sturdy FrIes 5os over 4 years ot yorcr Favorite Scit magazines 4 MAG FILES $495 Send Sd 95 pbs $1 00 postage ttandltng DGI4 INDUSTRIES P0 80X388-t DOVER NH 03820 COMPLETELY FINISHED R/C AIRCRAFT Completely Finished R/C Aircraft s & Types Radio Engine Only CG Sky Tiger--63 trainer $22500 Sig Clip Wing J-3 Cub-54 Span $25000 SEND FOR COMPLETE LIST HOBBY CAPITOL R/C 46 N Oak St. Ventura California 93001 node requires pilot active model once possible use half-dozen A1 models whole season now need assistance computer calculate what well need upcoming year Thereve few unfortunate de velopments over decadebut awful lot good things make up Charlie JahflSonr 3716 graham St San fliego CA 92109 Gotha 1 45/Crowe Continued rjace 74 intil have model trim Ising winder go broke prototype flies left circles about 10-ft dia transition power lide smooth havent flown indoors let outside gets flights about 35 O seconds painted model Flo luil railroad paint weighed 15 rams motor built another tne would leave plain white tissue olor reduce weight ummary Someone said got two /ings its gotta good am rgue statement Keep model ght will have good flier j Duration/Meuser ontinued page 77 pin using felt marker So what does appreciation steals AMA National Record right under very nose Fine guy Anyhow writing holds Cat egory II IV national records flight times 235 353 345 Walt Erbach holds remaining Cat III record astonishing 423 Walts model conventionalby ornithopter standardsbut very light rather long Patricks model 28 grams weighs almost four times much Walts rather unusual design being sort biplane history multi-wing ornithopter models goes back least early 1870s Frenchman Jobert built arti ficial dragonfly employed two wings tandem forward wing rocked counter clockwise rear wing rocked clock wise two wings driven single rubber motor through crankshaftand-connecting-rod arrangement cranks being phased about 1800 apart 1939 Dr Erich von HoIst Germany built similar rocking-wing models test theories insect flight mid-Fifties John White England built model wing ar rangement used Deshaye achieved flight 115 sec June 1978 issue Mode/Aviation showed photo threeview biplane ornithopter Danyl Stevens set Junior outdoor Category II records mechanism some what different Deshayes no fixed-wing area Deshaye de veloped design collaboration Reg Parham England collaboration de veloped through correspondence arose out International Ornithopter Postal Contest arranged David Erbach Unlike earlier multi-wing thopters phasing wing flapping nat 1800 two cranks lie plane common shaft Rather cranks phased 1200 apart wings gallop rather trot Deshayc says works better Deshayes model rugged heavy despite its performance quite remark able could cut weight half appears feasible would seem flights four- five-minute range would cinch Two new modeling organizations formed first called Ornithopter Modelers Society has formed Patrick Deshaye further interest exchange information relating rubberpowered ornithopter models no membership fee will one- two-page newsletter published perhaps six-month intervals Since Deshaye foot ing bill out own pocket seri ous ornithopter enthusiastsnot newsletter collectorsshould join Write Deshaye 6401 Wildflower SE Olympia WA 98501 second organization called Fun Flyers being put together Joe Wag ner intention promote noncompetitive model building flying kinds sport-type aircraft particularly can flown school athletic CLE1LAND GIANTS -~T1LGIANT SCALE BUFFS Worlds Largest Gas Plans Assortment INTERNATIONALLY FAMOUS C-D QUALITY MASTER MODELS PLANS 72 taoornbe Sedan $23 07 Pt 939 73 N Miteir Roeth 94 7'6t Hosnord Pete Base $35 65 MMataadt 528942 70 Bayte GeeBee $32r 78 Sopreith Pap 4i nrarlne S6B $24 DR Mosquito 8b$3s nrarine S6B 532 10858 MosqaBarrrb$48 Harnk PdE 936 6t Cortiss Rabirr 055$td rek PdE Pt $24 98 St, PTt7Kapdet$48 eed Vega $24 99 NBtk Widoca P6t$65 Patel LN94 $28 7t DacgSC3 Oran$20 tIes GE t F $39 95 Snag $03 Tran$40 coope Sport $36 96 Baa-Ic Teaaco t3$32 prBctldog $39i tOBCat020t/4 L&S$56 cca C3 Spt $35 79 A, SptPars A2$3a ouglas 0-38 Gb $24 60 Dooglas M2 Mail$24 32 Doustos 5-38 01 $491 68 Bristol Boltdog Ptr535 94 Page Curt Racer $45 59 BraccrrBaceMstA$54 7t Martin EtO $Orrrb $29 07 Grcrrr Bearot P99 $54 78 Torrrers WW Rev $35P 73 Tracel Air 6000 $24 64 Cot Gaslrk Pt tC2 $39 07 Mart M8-t Bare $44 94Cu Gahk Ft tC2 $04 91 Liadbergs NO2t 539 66 Det4an Carrret Boo $24 61 AEG DIV Lr Ban $24 62 Ha MrMulligan $33 tOO Paitch PTt9 Tr $59 94 Hoca Mr Mulligan $45 00 Waco TapnrWirrg $391 65 Bac ng F-26A Ptr $36 75 W6sId Lysender $32 84 Baerrrg P26A FIr $48 tOO Westld Lysander $49 69 Waca Cd Cabin $36 57 Ford Trirntr 4-AT$28 64 Beeclr C17B Stag $38 70 Ford Triart dAT$45 j96 Beecb Ct7B Stag $49 t 14 Pard PriorI dAT 559 55 Lock Electra $24 94 BerIJayce OFJ2 $56 82 Lack t t Electra $32 93 Loening C-2Arepb $69 63 Stinsan T/W 59781658 GroreJ2P Duck$39 81 Stinson 0/9597$3478 GrcreJ2P Duck$56 123 Stinson TW 587$3259 Gotba 010 Bore$22 Fr 928 $20 117 Garbo GtV Bare $39 Pr P28 832 dO Doog 0-AdA abs $32 Fr P2-B$45100 Sibo S38 Arepb$49 inunPif74 TL Peso0 Spec$4360 Eon 150 Sport$36 65 SkyrocketOF5F1$2090 Ba. 105 Sport$49 56 CotWnrhk P40$2490 StinALore Wirrg$56 adSighing P39$3980 Martin 74 T4M 1839 56 RepSen8ee An92475 HPge 0400 Bareb$55 o8Areph$30100 9pg0 0400 Ban$49 J3Cob 65 MChina Clipper udsor Bnrb$3897 MChino Clipper$60 FOFHellcat$2971 Loccson C2 Airlin$24 Bl7GFnrt$296690133 8U Jingre8391 8170 Fart54960 EronWinkle Bird$45 Wbrlreid$2454 Cort Sacilt SF934$20 ocion Lirdberg LSirius nraVOnI$3955 CnckrOind Ftr8orr$32 NO K SAVAILABLEIPrices sobject tochange tber Scales Sians Ftare6 Span Conrylete Pattern Frare 25c Add 10 roollordetslorsbipprng&ins etc OSACon &Meo EIereherradd IS l20sifbyairl Protorral catalog $1 50 Price list sectron alone 55c *l1v Foreign odd $1 001* OCLEYELAND MODEL&SUPPLY Co tB387B 0trrt AsClenelend Ole 44102 March 1984 167 THERE IS DIFFERENCE UT.$450UT.$560 UT.$760 GAL 5GAL 5 GAL 0 $RSM 91880$URUM 00 DRUM $50000 Drums available directly trom tactory Duke Fox flying model airplanes 30s alcohol fuel mixed himoelt early 405 discovered miracle ot nitromethane total world production less quart day has worn Out motors life tests fuel producers ever owned Result knows little about what takes make motor run well last long time Use Fox fuel . costs little motor will last great deal longer Hal LiOB 15011 6d61656 Fox MFG Co $305 TOWSON AVEFOOT SMITH ARK 72901 teshaye turned out Some 18 months o wrote asking information Out ornithopters sent him plans lappergasted along everything knew out thopters wrote head NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean Wont hami Painis Coverings Dries Clear fast Elminates Work cleaning model Strong Professional Quality formula Great Model Craff Bts Planes Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering information Also ask about other Super-K products Model Industry Are Manufacturers & Major Brands Distributors Model Engines Kits Radios & Accessories Sjqer-K orand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 fields parks other limited areas Major features proposed program include publication how-to-do-it book starting square publication quarterly magazine production low-cost brown-wrapper kits models presented book magazine providing liability insurance members organizing local regional Fun Fly-Ins similar contests no competition developing pro motional instructional program intro duce modeling youth groups schools foment nationwide campaign demonstrate aircraft modeling greatest spare-time activity ever de velopedan art science hobby sport young old rich poor male female information write Fun Fliers PO Box 95 Volant PA 16156 sport tlying opposed com petition flying aspect reminds Will Nakashima cartoon caption went something like fly just fun have fun win Yet another space-age material Getting bag potato chips nowadays enough chore have encountered some mailing envelopes going around Impossible tear material looks sort like doped silkspan its far stronger Alas too heavy Free Flight application could think up ever Ed Lidgard thought bit further splits stuff down whatever thickness needs According Ed name material something like TyvexI cant read writing too welland synthetic-fiber paper made American Excelsior commercial application knows mailing envelopes As produced 006 008-in thick peels stuff apart takes thicker half peels apart finally worries dull knife down thickness 001 002 weight about equal tissue light years ahead tissue strength application inside covering rubber-power fuselage tubes get some stuff hands youll probably figure out dozen applications right off Ed sticks balsa applying Titebond both surfaces crosslinking guess means curing MonoKote iron smooth surface out given coat thin dope make lube-proof Record-breaking Indoor Cabin model Bob Randolph tallied up eighth Indoor Cabin record last July Santa Ana flight 33 mm 37 sec story about last two Cabin records made removable pods landing gear attached Test flights made delicate pod replaced flat plate having same weight drag pod learned drag flat plate slighter greater streamlined form having same cross section Indoor-model speeds flat disc can built much lighter Thus Thin Man born came out total weight 00325 oz intended doing comparative tests using double-cone pod model disc flew very well setting record its third flight fortunate enough win FAI Team Selection Finals have con centrate preparations World Champs Additional Cabin-model develop ment will have wait Im sure use boron filament could get weight down have read rule book rather closely figure out Thin Man qual ifies Cabin model does rubber motor enclosed balsa tube disc attached disc covered both sides microfilm tiny balsa spool separating two surfaces rules require Cabin model have built-up enclosed fuselage little hard see balsa tube qualifies built-up structure However lot Cabin models have built way apparently OK Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued page 78 sets rollers would cut about eight fixed sizes 1/4 flat Pirelli several disadvantagesit could sharpened no possibility making strips slightly smaller larger built-in size would handle /44n wide rubber Finally could get exactly size did want cutter sets also got two three other sizes didnt want same pass Vilim Kmoch Yugoslavia made Rote Shear-type cutter adjustable cuts came very thin wash ers two diameters assembled cutters assembled roller beginning example eight 006-in -thick large-diameter washers fol lowed alternating layers eight small large-diameter wshers made other roller exact mirror image two rollers would overlap form rotao shear After assembly came agonizing trial and-error period adjusted enc pressure washers amount o overlap until satisfactory cut made Although could make several very pre cise sizes washers came three thicknesse allowing choice strip width 002 subtle variations cutting pass adjustment phase consumed several fee precious rubber Other advantages wen Vilims shear could sharpened once adjusted waste less mos strippers type current high-tech strippers cut rubbe off side size rubber strip thl same way meat slicers grocer 168 Model Aviation nun. P-40 CARD KIT FULL COLOR EXACT REPRODUCTION Jacks50 REMEMBER HOW ONWELL THEY FLEW Special offer inciodee cocpoo receining e eno eel hell price Send Fiite Modeis P0 Boo 62MMAR Roseojilo MI 48066 A.UNiCUE NOSTALGIC GIFT SILICONE gso 00 10 foOt COilsTUBING lD.062 09 125uS POST S/coil235 265 325 LARRY DODGE AERO INC 110210 MANNINGSTILLWATER MN 55082
Edition: Model Aviation - 1984/03
Page Numbers: 76, 77, 167, 168
Free Flight DURA TION Bob Meuser IN THE LEAD ITEM Januaiy 1984 column titled Strange configuration presented joined-wing concept al though didnt call invented Dr Julian Wolkovitch Shortly after publication issue before copy arrived received phone call Dr Wolkovitch later copy letter addressed Editor taking task aspects presentation Dr Wolkovitchs letter fol lows December 4 1983 Gentlemen Has life ever changed magazine article Bob Meusers account patented joined-wing configuration Model Aviation January 1984 spelled name incorrectly moved residence California Ohio inducted Air Force Worse yet almost technical statement article misleading wrong Because NASA US Navy several Universities aircraft manufac turers conducting extensive research joined wing promises aero dynamically structurally superior conventional wings must correct serious errors Mr Meusers article wind tunnel tests agricultural airplane design done NASA Air Force showed excellent aero dynamic characteristics NASA test re port Ref 1 predicts no problems full scale design Burt Rutan hasnt built full-scale because couldnt agree patent royalties because technical objections Bob Meusers drawing inaccurate airplane has unswept outer wings thick fin containing pilot shown photos published Aviation Week Ref 2 Joined wings have shown lighter stiffer conventional wing tail systems Ref 3 provided spars located near upper leading edge lower trailing edge As explained US Patent #4365773 gives depth resist loads acting perpendicular structural truss formed wings N 19 i ICondnsgt paper / / / / / -7 3 r M K~2 Typical hjir5c 1Jicjromt wing 3 34 Microjim 11 63 31s9ruct AWN Ir~85------Several joined-wing models have flown proper airfoil design washout front wing washin rear wing show good stability control tached photo illustrates quarter-scale model ultralight Longhorn will fly full-scale form 1984 Bob Meuser would like visit Palos Ver des CA Dayton OH would glad demonstrate him joined-wing model has exceptional flying qualities cludiong aileron-only turns flat glide safe stall/spin characteristics No joinedwing model kits plans yet available readers experiment simple sheet balsa models following principles explained references cited should able design own joined-wing air planes Sincerely s Dr Julian Wolkovitch References Ref 1 White E R Low-Speed Wind Tun nel Test Joined-Wing Agricultural Aircraft Model NASA Langley Research Center Report published 1984 Ref 2 Joined Wing Aircraft Planned Agricultural Applications' Aviation Week February 15 1982 p 144-145 76 Model Aviation Patrick Deshaye holds three four Indoor Ornithopter records Open category wild-looking model Bill Northrop maintains anything two wings better guess Bibitte proves hes right Deshaye Olympia WA also forming thopter enthusiast group Look information column Photo Joe Dvorak l3lt3lttEr Pcatrick PsIuze Mationat Records Indoor Optn Ornitkopter Cat II ef 3 Samuels M F Structural Weight Comparison Joined Wing Con ventional Wing AIAA Journal Air craft June 1982 sincerely apologize course spell ng Dr Wolkovitchs name wrong ticking him wrong town ir Force wish hed pecific said almost echnical statement article mis eading wrong Id like know ne got right have presume readers olumn interested Free Flight hile readers have other nterests may may include full ize aircraft speak Free Flight resented item sketch order ive Free Flighters general idea con ept little background ey might adapt concept own urposes three-view intended ive rough idea concept rather accurate representation particular airraft statement concept pplied proposed agricultural aircraft ooking somewhat like sketch essen ially accurate Note outer wing pan ls Dr Wolkovitchs RC model swept ack about like sketch shows although hose Rutan aircraft slightly wept back degree sweep evi lently essential concept cer ainly didnt intend say dont see hat did say imply anything effect hat full-size aircraft employing con ept wouldnt darned fine machine As regards stability control roblems entirely different full ze controlled aircraft naIl Free Flight models part e reason competition models dont ok anything like real aircraft Any Free lighter experimenting concept ould quick adopt whatever rudder Prtp irdia 34 pitch 2 / p area dihedral decalage CG position required make Free Flight model fly right stated bending rigidity wings didnt say bending thats what meant great trusslike appearance model front view might lead infer didnt mean wasn t probably lot better con ventional wing However placing spars Dr Wolkovitch recommends wouldnt much models thin Free Flight-type airfoil sections thing did realize until built simple cardboard model tremendous torsional rigidity joined-wing system provided roots wings chored something itself quite stiff perhaps good reason thick fin Free Flight model Getting sufficient tor sional rigidity real problem FF classes Nordic A-2 AMA Gas events old-rule Easy B low-ceiling Indoor Hand-Launched Glider name few short coupling approaching flying wing might give problems Free Flight applications Conceivably say low-ceiling IHLG could make coup ling shorter add con ventional tail boom tail must agree Hewitt Phillips 100% statement idea worth some experimentation will replace l6ng-tail-boom conventional configura tion competition Free Flight appli cations Still worth some experimenta tion should emphasized New ornitbopter record fine guy Patrick Continued page 167 vP 9 ----- 5 THIN MAN fob IZandolpk Record 3337 93 4 Zad TThk ioselyl cabin Indoor Cabin record-setter isa mIcrofIlm-covered disk see dangilng down under wing cabane aide vIew imented motor tube rubber motor completely enclosed motor tube next will lighter March 1984 77 Dr Julian Wolkovitch Inventor joined-wing concept Bob sketched January 1984 column Wolkovitch holds quarter-scale RC model ultralight design called Longhorn due fly lull scale during 1984 patent numbers concept 4365773 3942747 Bob has further comments potential modeling uses FF column 705% RADIO EQUIPMENT EXCHANGE Box 561 Park Forest Illinois 60466 List used radio equip ment sale No fee listing Escrow available Send SASE details 21 Old Time K HL Gliders 11 Contest Rubber Send 50C for4 Satellite Kits 82/83 catalog3 Nastalgia Power Pacifiers & LOTS OI GOCI StUFF FAIModel Supply II P0 Box 3957 ance CA 90510 GET ORGANIZED s set 01 4 sturdy FrIes 5os over 4 years ot yorcr Favorite Scit magazines 4 MAG FILES $495 Send Sd 95 pbs $1 00 postage ttandltng DGI4 INDUSTRIES P0 80X388-t DOVER NH 03820 COMPLETELY FINISHED R/C AIRCRAFT Completely Finished R/C Aircraft s & Types Radio Engine Only CG Sky Tiger--63 trainer $22500 Sig Clip Wing J-3 Cub-54 Span $25000 SEND FOR COMPLETE LIST HOBBY CAPITOL R/C 46 N Oak St. Ventura California 93001 node requires pilot active model once possible use half-dozen A1 models whole season now need assistance computer calculate what well need upcoming year Thereve few unfortunate de velopments over decadebut awful lot good things make up Charlie JahflSonr 3716 graham St San fliego CA 92109 Gotha 1 45/Crowe Continued rjace 74 intil have model trim Ising winder go broke prototype flies left circles about 10-ft dia transition power lide smooth havent flown indoors let outside gets flights about 35 O seconds painted model Flo luil railroad paint weighed 15 rams motor built another tne would leave plain white tissue olor reduce weight ummary Someone said got two /ings its gotta good am rgue statement Keep model ght will have good flier j Duration/Meuser ontinued page 77 pin using felt marker So what does appreciation steals AMA National Record right under very nose Fine guy Anyhow writing holds Cat egory II IV national records flight times 235 353 345 Walt Erbach holds remaining Cat III record astonishing 423 Walts model conventionalby ornithopter standardsbut very light rather long Patricks model 28 grams weighs almost four times much Walts rather unusual design being sort biplane history multi-wing ornithopter models goes back least early 1870s Frenchman Jobert built arti ficial dragonfly employed two wings tandem forward wing rocked counter clockwise rear wing rocked clock wise two wings driven single rubber motor through crankshaftand-connecting-rod arrangement cranks being phased about 1800 apart 1939 Dr Erich von HoIst Germany built similar rocking-wing models test theories insect flight mid-Fifties John White England built model wing ar rangement used Deshaye achieved flight 115 sec June 1978 issue Mode/Aviation showed photo threeview biplane ornithopter Danyl Stevens set Junior outdoor Category II records mechanism some what different Deshayes no fixed-wing area Deshaye de veloped design collaboration Reg Parham England collaboration de veloped through correspondence arose out International Ornithopter Postal Contest arranged David Erbach Unlike earlier multi-wing thopters phasing wing flapping nat 1800 two cranks lie plane common shaft Rather cranks phased 1200 apart wings gallop rather trot Deshayc says works better Deshayes model rugged heavy despite its performance quite remark able could cut weight half appears feasible would seem flights four- five-minute range would cinch Two new modeling organizations formed first called Ornithopter Modelers Society has formed Patrick Deshaye further interest exchange information relating rubberpowered ornithopter models no membership fee will one- two-page newsletter published perhaps six-month intervals Since Deshaye foot ing bill out own pocket seri ous ornithopter enthusiastsnot newsletter collectorsshould join Write Deshaye 6401 Wildflower SE Olympia WA 98501 second organization called Fun Flyers being put together Joe Wag ner intention promote noncompetitive model building flying kinds sport-type aircraft particularly can flown school athletic CLE1LAND GIANTS -~T1LGIANT SCALE BUFFS Worlds Largest Gas Plans Assortment INTERNATIONALLY FAMOUS C-D QUALITY MASTER MODELS PLANS 72 taoornbe Sedan $23 07 Pt 939 73 N Miteir Roeth 94 7'6t Hosnord Pete Base $35 65 MMataadt 528942 70 Bayte GeeBee $32r 78 Sopreith Pap 4i nrarlne S6B $24 DR Mosquito 8b$3s nrarine S6B 532 10858 MosqaBarrrb$48 Harnk PdE 936 6t Cortiss Rabirr 055$td rek PdE Pt $24 98 St, PTt7Kapdet$48 eed Vega $24 99 NBtk Widoca P6t$65 Patel LN94 $28 7t DacgSC3 Oran$20 tIes GE t F $39 95 Snag $03 Tran$40 coope Sport $36 96 Baa-Ic Teaaco t3$32 prBctldog $39i tOBCat020t/4 L&S$56 cca C3 Spt $35 79 A, SptPars A2$3a ouglas 0-38 Gb $24 60 Dooglas M2 Mail$24 32 Doustos 5-38 01 $491 68 Bristol Boltdog Ptr535 94 Page Curt Racer $45 59 BraccrrBaceMstA$54 7t Martin EtO $Orrrb $29 07 Grcrrr Bearot P99 $54 78 Torrrers WW Rev $35P 73 Tracel Air 6000 $24 64 Cot Gaslrk Pt tC2 $39 07 Mart M8-t Bare $44 94Cu Gahk Ft tC2 $04 91 Liadbergs NO2t 539 66 Det4an Carrret Boo $24 61 AEG DIV Lr Ban $24 62 Ha MrMulligan $33 tOO Paitch PTt9 Tr $59 94 Hoca Mr Mulligan $45 00 Waco TapnrWirrg $391 65 Bac ng F-26A Ptr $36 75 W6sId Lysender $32 84 Baerrrg P26A FIr $48 tOO Westld Lysander $49 69 Waca Cd Cabin $36 57 Ford Trirntr 4-AT$28 64 Beeclr C17B Stag $38 70 Ford Triart dAT$45 j96 Beecb Ct7B Stag $49 t 14 Pard PriorI dAT 559 55 Lock Electra $24 94 BerIJayce OFJ2 $56 82 Lack t t Electra $32 93 Loening C-2Arepb $69 63 Stinsan T/W 59781658 GroreJ2P Duck$39 81 Stinson 0/9597$3478 GrcreJ2P Duck$56 123 Stinson TW 587$3259 Gotba 010 Bore$22 Fr 928 $20 117 Garbo GtV Bare $39 Pr P28 832 dO Doog 0-AdA abs $32 Fr P2-B$45100 Sibo S38 Arepb$49 inunPif74 TL Peso0 Spec$4360 Eon 150 Sport$36 65 SkyrocketOF5F1$2090 Ba. 105 Sport$49 56 CotWnrhk P40$2490 StinALore Wirrg$56 adSighing P39$3980 Martin 74 T4M 1839 56 RepSen8ee An92475 HPge 0400 Bareb$55 o8Areph$30100 9pg0 0400 Ban$49 J3Cob 65 MChina Clipper udsor Bnrb$3897 MChino Clipper$60 FOFHellcat$2971 Loccson C2 Airlin$24 Bl7GFnrt$296690133 8U Jingre8391 8170 Fart54960 EronWinkle Bird$45 Wbrlreid$2454 Cort Sacilt SF934$20 ocion Lirdberg LSirius nraVOnI$3955 CnckrOind Ftr8orr$32 NO K SAVAILABLEIPrices sobject tochange tber Scales Sians Ftare6 Span Conrylete Pattern Frare 25c Add 10 roollordetslorsbipprng&ins etc OSACon &Meo EIereherradd IS l20sifbyairl Protorral catalog $1 50 Price list sectron alone 55c *l1v Foreign odd $1 001* OCLEYELAND MODEL&SUPPLY Co tB387B 0trrt AsClenelend Ole 44102 March 1984 167 THERE IS DIFFERENCE UT.$450UT.$560 UT.$760 GAL 5GAL 5 GAL 0 $RSM 91880$URUM 00 DRUM $50000 Drums available directly trom tactory Duke Fox flying model airplanes 30s alcohol fuel mixed himoelt early 405 discovered miracle ot nitromethane total world production less quart day has worn Out motors life tests fuel producers ever owned Result knows little about what takes make motor run well last long time Use Fox fuel . costs little motor will last great deal longer Hal LiOB 15011 6d61656 Fox MFG Co $305 TOWSON AVEFOOT SMITH ARK 72901 teshaye turned out Some 18 months o wrote asking information Out ornithopters sent him plans lappergasted along everything knew out thopters wrote head NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean Wont hami Painis Coverings Dries Clear fast Elminates Work cleaning model Strong Professional Quality formula Great Model Craff Bts Planes Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering information Also ask about other Super-K products Model Industry Are Manufacturers & Major Brands Distributors Model Engines Kits Radios & Accessories Sjqer-K orand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 fields parks other limited areas Major features proposed program include publication how-to-do-it book starting square publication quarterly magazine production low-cost brown-wrapper kits models presented book magazine providing liability insurance members organizing local regional Fun Fly-Ins similar contests no competition developing pro motional instructional program intro duce modeling youth groups schools foment nationwide campaign demonstrate aircraft modeling greatest spare-time activity ever de velopedan art science hobby sport young old rich poor male female information write Fun Fliers PO Box 95 Volant PA 16156 sport tlying opposed com petition flying aspect reminds Will Nakashima cartoon caption went something like fly just fun have fun win Yet another space-age material Getting bag potato chips nowadays enough chore have encountered some mailing envelopes going around Impossible tear material looks sort like doped silkspan its far stronger Alas too heavy Free Flight application could think up ever Ed Lidgard thought bit further splits stuff down whatever thickness needs According Ed name material something like TyvexI cant read writing too welland synthetic-fiber paper made American Excelsior commercial application knows mailing envelopes As produced 006 008-in thick peels stuff apart takes thicker half peels apart finally worries dull knife down thickness 001 002 weight about equal tissue light years ahead tissue strength application inside covering rubber-power fuselage tubes get some stuff hands youll probably figure out dozen applications right off Ed sticks balsa applying Titebond both surfaces crosslinking guess means curing MonoKote iron smooth surface out given coat thin dope make lube-proof Record-breaking Indoor Cabin model Bob Randolph tallied up eighth Indoor Cabin record last July Santa Ana flight 33 mm 37 sec story about last two Cabin records made removable pods landing gear attached Test flights made delicate pod replaced flat plate having same weight drag pod learned drag flat plate slighter greater streamlined form having same cross section Indoor-model speeds flat disc can built much lighter Thus Thin Man born came out total weight 00325 oz intended doing comparative tests using double-cone pod model disc flew very well setting record its third flight fortunate enough win FAI Team Selection Finals have con centrate preparations World Champs Additional Cabin-model develop ment will have wait Im sure use boron filament could get weight down have read rule book rather closely figure out Thin Man qual ifies Cabin model does rubber motor enclosed balsa tube disc attached disc covered both sides microfilm tiny balsa spool separating two surfaces rules require Cabin model have built-up enclosed fuselage little hard see balsa tube qualifies built-up structure However lot Cabin models have built way apparently OK Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued page 78 sets rollers would cut about eight fixed sizes 1/4 flat Pirelli several disadvantagesit could sharpened no possibility making strips slightly smaller larger built-in size would handle /44n wide rubber Finally could get exactly size did want cutter sets also got two three other sizes didnt want same pass Vilim Kmoch Yugoslavia made Rote Shear-type cutter adjustable cuts came very thin wash ers two diameters assembled cutters assembled roller beginning example eight 006-in -thick large-diameter washers fol lowed alternating layers eight small large-diameter wshers made other roller exact mirror image two rollers would overlap form rotao shear After assembly came agonizing trial and-error period adjusted enc pressure washers amount o overlap until satisfactory cut made Although could make several very pre cise sizes washers came three thicknesse allowing choice strip width 002 subtle variations cutting pass adjustment phase consumed several fee precious rubber Other advantages wen Vilims shear could sharpened once adjusted waste less mos strippers type current high-tech strippers cut rubbe off side size rubber strip thl same way meat slicers grocer 168 Model Aviation nun. P-40 CARD KIT FULL COLOR EXACT REPRODUCTION Jacks50 REMEMBER HOW ONWELL THEY FLEW Special offer inciodee cocpoo receining e eno eel hell price Send Fiite Modeis P0 Boo 62MMAR Roseojilo MI 48066 A.UNiCUE NOSTALGIC GIFT SILICONE gso 00 10 foOt COilsTUBING lD.062 09 125uS POST S/coil235 265 325 LARRY DODGE AERO INC 110210 MANNINGSTILLWATER MN 55082
Edition: Model Aviation - 1984/03
Page Numbers: 76, 77, 167, 168
Free Flight DURA TION Bob Meuser IN THE LEAD ITEM Januaiy 1984 column titled Strange configuration presented joined-wing concept al though didnt call invented Dr Julian Wolkovitch Shortly after publication issue before copy arrived received phone call Dr Wolkovitch later copy letter addressed Editor taking task aspects presentation Dr Wolkovitchs letter fol lows December 4 1983 Gentlemen Has life ever changed magazine article Bob Meusers account patented joined-wing configuration Model Aviation January 1984 spelled name incorrectly moved residence California Ohio inducted Air Force Worse yet almost technical statement article misleading wrong Because NASA US Navy several Universities aircraft manufac turers conducting extensive research joined wing promises aero dynamically structurally superior conventional wings must correct serious errors Mr Meusers article wind tunnel tests agricultural airplane design done NASA Air Force showed excellent aero dynamic characteristics NASA test re port Ref 1 predicts no problems full scale design Burt Rutan hasnt built full-scale because couldnt agree patent royalties because technical objections Bob Meusers drawing inaccurate airplane has unswept outer wings thick fin containing pilot shown photos published Aviation Week Ref 2 Joined wings have shown lighter stiffer conventional wing tail systems Ref 3 provided spars located near upper leading edge lower trailing edge As explained US Patent #4365773 gives depth resist loads acting perpendicular structural truss formed wings N 19 i ICondnsgt paper / / / / / -7 3 r M K~2 Typical hjir5c 1Jicjromt wing 3 34 Microjim 11 63 31s9ruct AWN Ir~85------Several joined-wing models have flown proper airfoil design washout front wing washin rear wing show good stability control tached photo illustrates quarter-scale model ultralight Longhorn will fly full-scale form 1984 Bob Meuser would like visit Palos Ver des CA Dayton OH would glad demonstrate him joined-wing model has exceptional flying qualities cludiong aileron-only turns flat glide safe stall/spin characteristics No joinedwing model kits plans yet available readers experiment simple sheet balsa models following principles explained references cited should able design own joined-wing air planes Sincerely s Dr Julian Wolkovitch References Ref 1 White E R Low-Speed Wind Tun nel Test Joined-Wing Agricultural Aircraft Model NASA Langley Research Center Report published 1984 Ref 2 Joined Wing Aircraft Planned Agricultural Applications' Aviation Week February 15 1982 p 144-145 76 Model Aviation Patrick Deshaye holds three four Indoor Ornithopter records Open category wild-looking model Bill Northrop maintains anything two wings better guess Bibitte proves hes right Deshaye Olympia WA also forming thopter enthusiast group Look information column Photo Joe Dvorak l3lt3lttEr Pcatrick PsIuze Mationat Records Indoor Optn Ornitkopter Cat II ef 3 Samuels M F Structural Weight Comparison Joined Wing Con ventional Wing AIAA Journal Air craft June 1982 sincerely apologize course spell ng Dr Wolkovitchs name wrong ticking him wrong town ir Force wish hed pecific said almost echnical statement article mis eading wrong Id like know ne got right have presume readers olumn interested Free Flight hile readers have other nterests may may include full ize aircraft speak Free Flight resented item sketch order ive Free Flighters general idea con ept little background ey might adapt concept own urposes three-view intended ive rough idea concept rather accurate representation particular airraft statement concept pplied proposed agricultural aircraft ooking somewhat like sketch essen ially accurate Note outer wing pan ls Dr Wolkovitchs RC model swept ack about like sketch shows although hose Rutan aircraft slightly wept back degree sweep evi lently essential concept cer ainly didnt intend say dont see hat did say imply anything effect hat full-size aircraft employing con ept wouldnt darned fine machine As regards stability control roblems entirely different full ze controlled aircraft naIl Free Flight models part e reason competition models dont ok anything like real aircraft Any Free lighter experimenting concept ould quick adopt whatever rudder Prtp irdia 34 pitch 2 / p area dihedral decalage CG position required make Free Flight model fly right stated bending rigidity wings didnt say bending thats what meant great trusslike appearance model front view might lead infer didnt mean wasn t probably lot better con ventional wing However placing spars Dr Wolkovitch recommends wouldnt much models thin Free Flight-type airfoil sections thing did realize until built simple cardboard model tremendous torsional rigidity joined-wing system provided roots wings chored something itself quite stiff perhaps good reason thick fin Free Flight model Getting sufficient tor sional rigidity real problem FF classes Nordic A-2 AMA Gas events old-rule Easy B low-ceiling Indoor Hand-Launched Glider name few short coupling approaching flying wing might give problems Free Flight applications Conceivably say low-ceiling IHLG could make coup ling shorter add con ventional tail boom tail must agree Hewitt Phillips 100% statement idea worth some experimentation will replace l6ng-tail-boom conventional configura tion competition Free Flight appli cations Still worth some experimenta tion should emphasized New ornitbopter record fine guy Patrick Continued page 167 vP 9 ----- 5 THIN MAN fob IZandolpk Record 3337 93 4 Zad TThk ioselyl cabin Indoor Cabin record-setter isa mIcrofIlm-covered disk see dangilng down under wing cabane aide vIew imented motor tube rubber motor completely enclosed motor tube next will lighter March 1984 77 Dr Julian Wolkovitch Inventor joined-wing concept Bob sketched January 1984 column Wolkovitch holds quarter-scale RC model ultralight design called Longhorn due fly lull scale during 1984 patent numbers concept 4365773 3942747 Bob has further comments potential modeling uses FF column 705% RADIO EQUIPMENT EXCHANGE Box 561 Park Forest Illinois 60466 List used radio equip ment sale No fee listing Escrow available Send SASE details 21 Old Time K HL Gliders 11 Contest Rubber Send 50C for4 Satellite Kits 82/83 catalog3 Nastalgia Power Pacifiers & LOTS OI GOCI StUFF FAIModel Supply II P0 Box 3957 ance CA 90510 GET ORGANIZED s set 01 4 sturdy FrIes 5os over 4 years ot yorcr Favorite Scit magazines 4 MAG FILES $495 Send Sd 95 pbs $1 00 postage ttandltng DGI4 INDUSTRIES P0 80X388-t DOVER NH 03820 COMPLETELY FINISHED R/C AIRCRAFT Completely Finished R/C Aircraft s & Types Radio Engine Only CG Sky Tiger--63 trainer $22500 Sig Clip Wing J-3 Cub-54 Span $25000 SEND FOR COMPLETE LIST HOBBY CAPITOL R/C 46 N Oak St. Ventura California 93001 node requires pilot active model once possible use half-dozen A1 models whole season now need assistance computer calculate what well need upcoming year Thereve few unfortunate de velopments over decadebut awful lot good things make up Charlie JahflSonr 3716 graham St San fliego CA 92109 Gotha 1 45/Crowe Continued rjace 74 intil have model trim Ising winder go broke prototype flies left circles about 10-ft dia transition power lide smooth havent flown indoors let outside gets flights about 35 O seconds painted model Flo luil railroad paint weighed 15 rams motor built another tne would leave plain white tissue olor reduce weight ummary Someone said got two /ings its gotta good am rgue statement Keep model ght will have good flier j Duration/Meuser ontinued page 77 pin using felt marker So what does appreciation steals AMA National Record right under very nose Fine guy Anyhow writing holds Cat egory II IV national records flight times 235 353 345 Walt Erbach holds remaining Cat III record astonishing 423 Walts model conventionalby ornithopter standardsbut very light rather long Patricks model 28 grams weighs almost four times much Walts rather unusual design being sort biplane history multi-wing ornithopter models goes back least early 1870s Frenchman Jobert built arti ficial dragonfly employed two wings tandem forward wing rocked counter clockwise rear wing rocked clock wise two wings driven single rubber motor through crankshaftand-connecting-rod arrangement cranks being phased about 1800 apart 1939 Dr Erich von HoIst Germany built similar rocking-wing models test theories insect flight mid-Fifties John White England built model wing ar rangement used Deshaye achieved flight 115 sec June 1978 issue Mode/Aviation showed photo threeview biplane ornithopter Danyl Stevens set Junior outdoor Category II records mechanism some what different Deshayes no fixed-wing area Deshaye de veloped design collaboration Reg Parham England collaboration de veloped through correspondence arose out International Ornithopter Postal Contest arranged David Erbach Unlike earlier multi-wing thopters phasing wing flapping nat 1800 two cranks lie plane common shaft Rather cranks phased 1200 apart wings gallop rather trot Deshayc says works better Deshayes model rugged heavy despite its performance quite remark able could cut weight half appears feasible would seem flights four- five-minute range would cinch Two new modeling organizations formed first called Ornithopter Modelers Society has formed Patrick Deshaye further interest exchange information relating rubberpowered ornithopter models no membership fee will one- two-page newsletter published perhaps six-month intervals Since Deshaye foot ing bill out own pocket seri ous ornithopter enthusiastsnot newsletter collectorsshould join Write Deshaye 6401 Wildflower SE Olympia WA 98501 second organization called Fun Flyers being put together Joe Wag ner intention promote noncompetitive model building flying kinds sport-type aircraft particularly can flown school athletic CLE1LAND GIANTS -~T1LGIANT SCALE BUFFS Worlds Largest Gas Plans Assortment INTERNATIONALLY FAMOUS C-D QUALITY MASTER MODELS PLANS 72 taoornbe Sedan $23 07 Pt 939 73 N Miteir Roeth 94 7'6t Hosnord Pete Base $35 65 MMataadt 528942 70 Bayte GeeBee $32r 78 Sopreith Pap 4i nrarlne S6B $24 DR Mosquito 8b$3s nrarine S6B 532 10858 MosqaBarrrb$48 Harnk PdE 936 6t Cortiss Rabirr 055$td rek PdE Pt $24 98 St, PTt7Kapdet$48 eed Vega $24 99 NBtk Widoca P6t$65 Patel LN94 $28 7t DacgSC3 Oran$20 tIes GE t F $39 95 Snag $03 Tran$40 coope Sport $36 96 Baa-Ic Teaaco t3$32 prBctldog $39i tOBCat020t/4 L&S$56 cca C3 Spt $35 79 A, SptPars A2$3a ouglas 0-38 Gb $24 60 Dooglas M2 Mail$24 32 Doustos 5-38 01 $491 68 Bristol Boltdog Ptr535 94 Page Curt Racer $45 59 BraccrrBaceMstA$54 7t Martin EtO $Orrrb $29 07 Grcrrr Bearot P99 $54 78 Torrrers WW Rev $35P 73 Tracel Air 6000 $24 64 Cot Gaslrk Pt tC2 $39 07 Mart M8-t Bare $44 94Cu Gahk Ft tC2 $04 91 Liadbergs NO2t 539 66 Det4an Carrret Boo $24 61 AEG DIV Lr Ban $24 62 Ha MrMulligan $33 tOO Paitch PTt9 Tr $59 94 Hoca Mr Mulligan $45 00 Waco TapnrWirrg $391 65 Bac ng F-26A Ptr $36 75 W6sId Lysender $32 84 Baerrrg P26A FIr $48 tOO Westld Lysander $49 69 Waca Cd Cabin $36 57 Ford Trirntr 4-AT$28 64 Beeclr C17B Stag $38 70 Ford Triart dAT$45 j96 Beecb Ct7B Stag $49 t 14 Pard PriorI dAT 559 55 Lock Electra $24 94 BerIJayce OFJ2 $56 82 Lack t t Electra $32 93 Loening C-2Arepb $69 63 Stinsan T/W 59781658 GroreJ2P Duck$39 81 Stinson 0/9597$3478 GrcreJ2P Duck$56 123 Stinson TW 587$3259 Gotba 010 Bore$22 Fr 928 $20 117 Garbo GtV Bare $39 Pr P28 832 dO Doog 0-AdA abs $32 Fr P2-B$45100 Sibo S38 Arepb$49 inunPif74 TL Peso0 Spec$4360 Eon 150 Sport$36 65 SkyrocketOF5F1$2090 Ba. 105 Sport$49 56 CotWnrhk P40$2490 StinALore Wirrg$56 adSighing P39$3980 Martin 74 T4M 1839 56 RepSen8ee An92475 HPge 0400 Bareb$55 o8Areph$30100 9pg0 0400 Ban$49 J3Cob 65 MChina Clipper udsor Bnrb$3897 MChino Clipper$60 FOFHellcat$2971 Loccson C2 Airlin$24 Bl7GFnrt$296690133 8U Jingre8391 8170 Fart54960 EronWinkle Bird$45 Wbrlreid$2454 Cort Sacilt SF934$20 ocion Lirdberg LSirius nraVOnI$3955 CnckrOind Ftr8orr$32 NO K SAVAILABLEIPrices sobject tochange tber Scales Sians Ftare6 Span Conrylete Pattern Frare 25c Add 10 roollordetslorsbipprng&ins etc OSACon &Meo EIereherradd IS l20sifbyairl Protorral catalog $1 50 Price list sectron alone 55c *l1v Foreign odd $1 001* OCLEYELAND MODEL&SUPPLY Co tB387B 0trrt AsClenelend Ole 44102 March 1984 167 THERE IS DIFFERENCE UT.$450UT.$560 UT.$760 GAL 5GAL 5 GAL 0 $RSM 91880$URUM 00 DRUM $50000 Drums available directly trom tactory Duke Fox flying model airplanes 30s alcohol fuel mixed himoelt early 405 discovered miracle ot nitromethane total world production less quart day has worn Out motors life tests fuel producers ever owned Result knows little about what takes make motor run well last long time Use Fox fuel . costs little motor will last great deal longer Hal LiOB 15011 6d61656 Fox MFG Co $305 TOWSON AVEFOOT SMITH ARK 72901 teshaye turned out Some 18 months o wrote asking information Out ornithopters sent him plans lappergasted along everything knew out thopters wrote head NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean Wont hami Painis Coverings Dries Clear fast Elminates Work cleaning model Strong Professional Quality formula Great Model Craff Bts Planes Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering information Also ask about other Super-K products Model Industry Are Manufacturers & Major Brands Distributors Model Engines Kits Radios & Accessories Sjqer-K orand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 fields parks other limited areas Major features proposed program include publication how-to-do-it book starting square publication quarterly magazine production low-cost brown-wrapper kits models presented book magazine providing liability insurance members organizing local regional Fun Fly-Ins similar contests no competition developing pro motional instructional program intro duce modeling youth groups schools foment nationwide campaign demonstrate aircraft modeling greatest spare-time activity ever de velopedan art science hobby sport young old rich poor male female information write Fun Fliers PO Box 95 Volant PA 16156 sport tlying opposed com petition flying aspect reminds Will Nakashima cartoon caption went something like fly just fun have fun win Yet another space-age material Getting bag potato chips nowadays enough chore have encountered some mailing envelopes going around Impossible tear material looks sort like doped silkspan its far stronger Alas too heavy Free Flight application could think up ever Ed Lidgard thought bit further splits stuff down whatever thickness needs According Ed name material something like TyvexI cant read writing too welland synthetic-fiber paper made American Excelsior commercial application knows mailing envelopes As produced 006 008-in thick peels stuff apart takes thicker half peels apart finally worries dull knife down thickness 001 002 weight about equal tissue light years ahead tissue strength application inside covering rubber-power fuselage tubes get some stuff hands youll probably figure out dozen applications right off Ed sticks balsa applying Titebond both surfaces crosslinking guess means curing MonoKote iron smooth surface out given coat thin dope make lube-proof Record-breaking Indoor Cabin model Bob Randolph tallied up eighth Indoor Cabin record last July Santa Ana flight 33 mm 37 sec story about last two Cabin records made removable pods landing gear attached Test flights made delicate pod replaced flat plate having same weight drag pod learned drag flat plate slighter greater streamlined form having same cross section Indoor-model speeds flat disc can built much lighter Thus Thin Man born came out total weight 00325 oz intended doing comparative tests using double-cone pod model disc flew very well setting record its third flight fortunate enough win FAI Team Selection Finals have con centrate preparations World Champs Additional Cabin-model develop ment will have wait Im sure use boron filament could get weight down have read rule book rather closely figure out Thin Man qual ifies Cabin model does rubber motor enclosed balsa tube disc attached disc covered both sides microfilm tiny balsa spool separating two surfaces rules require Cabin model have built-up enclosed fuselage little hard see balsa tube qualifies built-up structure However lot Cabin models have built way apparently OK Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued page 78 sets rollers would cut about eight fixed sizes 1/4 flat Pirelli several disadvantagesit could sharpened no possibility making strips slightly smaller larger built-in size would handle /44n wide rubber Finally could get exactly size did want cutter sets also got two three other sizes didnt want same pass Vilim Kmoch Yugoslavia made Rote Shear-type cutter adjustable cuts came very thin wash ers two diameters assembled cutters assembled roller beginning example eight 006-in -thick large-diameter washers fol lowed alternating layers eight small large-diameter wshers made other roller exact mirror image two rollers would overlap form rotao shear After assembly came agonizing trial and-error period adjusted enc pressure washers amount o overlap until satisfactory cut made Although could make several very pre cise sizes washers came three thicknesse allowing choice strip width 002 subtle variations cutting pass adjustment phase consumed several fee precious rubber Other advantages wen Vilims shear could sharpened once adjusted waste less mos strippers type current high-tech strippers cut rubbe off side size rubber strip thl same way meat slicers grocer 168 Model Aviation nun. P-40 CARD KIT FULL COLOR EXACT REPRODUCTION Jacks50 REMEMBER HOW ONWELL THEY FLEW Special offer inciodee cocpoo receining e eno eel hell price Send Fiite Modeis P0 Boo 62MMAR Roseojilo MI 48066 A.UNiCUE NOSTALGIC GIFT SILICONE gso 00 10 foOt COilsTUBING lD.062 09 125uS POST S/coil235 265 325 LARRY DODGE AERO INC 110210 MANNINGSTILLWATER MN 55082
Edition: Model Aviation - 1984/03
Page Numbers: 76, 77, 167, 168
Free Flight DURA TION Bob Meuser IN THE LEAD ITEM Januaiy 1984 column titled Strange configuration presented joined-wing concept al though didnt call invented Dr Julian Wolkovitch Shortly after publication issue before copy arrived received phone call Dr Wolkovitch later copy letter addressed Editor taking task aspects presentation Dr Wolkovitchs letter fol lows December 4 1983 Gentlemen Has life ever changed magazine article Bob Meusers account patented joined-wing configuration Model Aviation January 1984 spelled name incorrectly moved residence California Ohio inducted Air Force Worse yet almost technical statement article misleading wrong Because NASA US Navy several Universities aircraft manufac turers conducting extensive research joined wing promises aero dynamically structurally superior conventional wings must correct serious errors Mr Meusers article wind tunnel tests agricultural airplane design done NASA Air Force showed excellent aero dynamic characteristics NASA test re port Ref 1 predicts no problems full scale design Burt Rutan hasnt built full-scale because couldnt agree patent royalties because technical objections Bob Meusers drawing inaccurate airplane has unswept outer wings thick fin containing pilot shown photos published Aviation Week Ref 2 Joined wings have shown lighter stiffer conventional wing tail systems Ref 3 provided spars located near upper leading edge lower trailing edge As explained US Patent #4365773 gives depth resist loads acting perpendicular structural truss formed wings N 19 i ICondnsgt paper / / / / / -7 3 r M K~2 Typical hjir5c 1Jicjromt wing 3 34 Microjim 11 63 31s9ruct AWN Ir~85------Several joined-wing models have flown proper airfoil design washout front wing washin rear wing show good stability control tached photo illustrates quarter-scale model ultralight Longhorn will fly full-scale form 1984 Bob Meuser would like visit Palos Ver des CA Dayton OH would glad demonstrate him joined-wing model has exceptional flying qualities cludiong aileron-only turns flat glide safe stall/spin characteristics No joinedwing model kits plans yet available readers experiment simple sheet balsa models following principles explained references cited should able design own joined-wing air planes Sincerely s Dr Julian Wolkovitch References Ref 1 White E R Low-Speed Wind Tun nel Test Joined-Wing Agricultural Aircraft Model NASA Langley Research Center Report published 1984 Ref 2 Joined Wing Aircraft Planned Agricultural Applications' Aviation Week February 15 1982 p 144-145 76 Model Aviation Patrick Deshaye holds three four Indoor Ornithopter records Open category wild-looking model Bill Northrop maintains anything two wings better guess Bibitte proves hes right Deshaye Olympia WA also forming thopter enthusiast group Look information column Photo Joe Dvorak l3lt3lttEr Pcatrick PsIuze Mationat Records Indoor Optn Ornitkopter Cat II ef 3 Samuels M F Structural Weight Comparison Joined Wing Con ventional Wing AIAA Journal Air craft June 1982 sincerely apologize course spell ng Dr Wolkovitchs name wrong ticking him wrong town ir Force wish hed pecific said almost echnical statement article mis eading wrong Id like know ne got right have presume readers olumn interested Free Flight hile readers have other nterests may may include full ize aircraft speak Free Flight resented item sketch order ive Free Flighters general idea con ept little background ey might adapt concept own urposes three-view intended ive rough idea concept rather accurate representation particular airraft statement concept pplied proposed agricultural aircraft ooking somewhat like sketch essen ially accurate Note outer wing pan ls Dr Wolkovitchs RC model swept ack about like sketch shows although hose Rutan aircraft slightly wept back degree sweep evi lently essential concept cer ainly didnt intend say dont see hat did say imply anything effect hat full-size aircraft employing con ept wouldnt darned fine machine As regards stability control roblems entirely different full ze controlled aircraft naIl Free Flight models part e reason competition models dont ok anything like real aircraft Any Free lighter experimenting concept ould quick adopt whatever rudder Prtp irdia 34 pitch 2 / p area dihedral decalage CG position required make Free Flight model fly right stated bending rigidity wings didnt say bending thats what meant great trusslike appearance model front view might lead infer didnt mean wasn t probably lot better con ventional wing However placing spars Dr Wolkovitch recommends wouldnt much models thin Free Flight-type airfoil sections thing did realize until built simple cardboard model tremendous torsional rigidity joined-wing system provided roots wings chored something itself quite stiff perhaps good reason thick fin Free Flight model Getting sufficient tor sional rigidity real problem FF classes Nordic A-2 AMA Gas events old-rule Easy B low-ceiling Indoor Hand-Launched Glider name few short coupling approaching flying wing might give problems Free Flight applications Conceivably say low-ceiling IHLG could make coup ling shorter add con ventional tail boom tail must agree Hewitt Phillips 100% statement idea worth some experimentation will replace l6ng-tail-boom conventional configura tion competition Free Flight appli cations Still worth some experimenta tion should emphasized New ornitbopter record fine guy Patrick Continued page 167 vP 9 ----- 5 THIN MAN fob IZandolpk Record 3337 93 4 Zad TThk ioselyl cabin Indoor Cabin record-setter isa mIcrofIlm-covered disk see dangilng down under wing cabane aide vIew imented motor tube rubber motor completely enclosed motor tube next will lighter March 1984 77 Dr Julian Wolkovitch Inventor joined-wing concept Bob sketched January 1984 column Wolkovitch holds quarter-scale RC model ultralight design called Longhorn due fly lull scale during 1984 patent numbers concept 4365773 3942747 Bob has further comments potential modeling uses FF column 705% RADIO EQUIPMENT EXCHANGE Box 561 Park Forest Illinois 60466 List used radio equip ment sale No fee listing Escrow available Send SASE details 21 Old Time K HL Gliders 11 Contest Rubber Send 50C for4 Satellite Kits 82/83 catalog3 Nastalgia Power Pacifiers & LOTS OI GOCI StUFF FAIModel Supply II P0 Box 3957 ance CA 90510 GET ORGANIZED s set 01 4 sturdy FrIes 5os over 4 years ot yorcr Favorite Scit magazines 4 MAG FILES $495 Send Sd 95 pbs $1 00 postage ttandltng DGI4 INDUSTRIES P0 80X388-t DOVER NH 03820 COMPLETELY FINISHED R/C AIRCRAFT Completely Finished R/C Aircraft s & Types Radio Engine Only CG Sky Tiger--63 trainer $22500 Sig Clip Wing J-3 Cub-54 Span $25000 SEND FOR COMPLETE LIST HOBBY CAPITOL R/C 46 N Oak St. Ventura California 93001 node requires pilot active model once possible use half-dozen A1 models whole season now need assistance computer calculate what well need upcoming year Thereve few unfortunate de velopments over decadebut awful lot good things make up Charlie JahflSonr 3716 graham St San fliego CA 92109 Gotha 1 45/Crowe Continued rjace 74 intil have model trim Ising winder go broke prototype flies left circles about 10-ft dia transition power lide smooth havent flown indoors let outside gets flights about 35 O seconds painted model Flo luil railroad paint weighed 15 rams motor built another tne would leave plain white tissue olor reduce weight ummary Someone said got two /ings its gotta good am rgue statement Keep model ght will have good flier j Duration/Meuser ontinued page 77 pin using felt marker So what does appreciation steals AMA National Record right under very nose Fine guy Anyhow writing holds Cat egory II IV national records flight times 235 353 345 Walt Erbach holds remaining Cat III record astonishing 423 Walts model conventionalby ornithopter standardsbut very light rather long Patricks model 28 grams weighs almost four times much Walts rather unusual design being sort biplane history multi-wing ornithopter models goes back least early 1870s Frenchman Jobert built arti ficial dragonfly employed two wings tandem forward wing rocked counter clockwise rear wing rocked clock wise two wings driven single rubber motor through crankshaftand-connecting-rod arrangement cranks being phased about 1800 apart 1939 Dr Erich von HoIst Germany built similar rocking-wing models test theories insect flight mid-Fifties John White England built model wing ar rangement used Deshaye achieved flight 115 sec June 1978 issue Mode/Aviation showed photo threeview biplane ornithopter Danyl Stevens set Junior outdoor Category II records mechanism some what different Deshayes no fixed-wing area Deshaye de veloped design collaboration Reg Parham England collaboration de veloped through correspondence arose out International Ornithopter Postal Contest arranged David Erbach Unlike earlier multi-wing thopters phasing wing flapping nat 1800 two cranks lie plane common shaft Rather cranks phased 1200 apart wings gallop rather trot Deshayc says works better Deshayes model rugged heavy despite its performance quite remark able could cut weight half appears feasible would seem flights four- five-minute range would cinch Two new modeling organizations formed first called Ornithopter Modelers Society has formed Patrick Deshaye further interest exchange information relating rubberpowered ornithopter models no membership fee will one- two-page newsletter published perhaps six-month intervals Since Deshaye foot ing bill out own pocket seri ous ornithopter enthusiastsnot newsletter collectorsshould join Write Deshaye 6401 Wildflower SE Olympia WA 98501 second organization called Fun Flyers being put together Joe Wag ner intention promote noncompetitive model building flying kinds sport-type aircraft particularly can flown school athletic CLE1LAND GIANTS -~T1LGIANT SCALE BUFFS Worlds Largest Gas Plans Assortment INTERNATIONALLY FAMOUS C-D QUALITY MASTER MODELS PLANS 72 taoornbe Sedan $23 07 Pt 939 73 N Miteir Roeth 94 7'6t Hosnord Pete Base $35 65 MMataadt 528942 70 Bayte GeeBee $32r 78 Sopreith Pap 4i nrarlne S6B $24 DR Mosquito 8b$3s nrarine S6B 532 10858 MosqaBarrrb$48 Harnk PdE 936 6t Cortiss Rabirr 055$td rek PdE Pt $24 98 St, PTt7Kapdet$48 eed Vega $24 99 NBtk Widoca P6t$65 Patel LN94 $28 7t DacgSC3 Oran$20 tIes GE t F $39 95 Snag $03 Tran$40 coope Sport $36 96 Baa-Ic Teaaco t3$32 prBctldog $39i tOBCat020t/4 L&S$56 cca C3 Spt $35 79 A, SptPars A2$3a ouglas 0-38 Gb $24 60 Dooglas M2 Mail$24 32 Doustos 5-38 01 $491 68 Bristol Boltdog Ptr535 94 Page Curt Racer $45 59 BraccrrBaceMstA$54 7t Martin EtO $Orrrb $29 07 Grcrrr Bearot P99 $54 78 Torrrers WW Rev $35P 73 Tracel Air 6000 $24 64 Cot Gaslrk Pt tC2 $39 07 Mart M8-t Bare $44 94Cu Gahk Ft tC2 $04 91 Liadbergs NO2t 539 66 Det4an Carrret Boo $24 61 AEG DIV Lr Ban $24 62 Ha MrMulligan $33 tOO Paitch PTt9 Tr $59 94 Hoca Mr Mulligan $45 00 Waco TapnrWirrg $391 65 Bac ng F-26A Ptr $36 75 W6sId Lysender $32 84 Baerrrg P26A FIr $48 tOO Westld Lysander $49 69 Waca Cd Cabin $36 57 Ford Trirntr 4-AT$28 64 Beeclr C17B Stag $38 70 Ford Triart dAT$45 j96 Beecb Ct7B Stag $49 t 14 Pard PriorI dAT 559 55 Lock Electra $24 94 BerIJayce OFJ2 $56 82 Lack t t Electra $32 93 Loening C-2Arepb $69 63 Stinsan T/W 59781658 GroreJ2P Duck$39 81 Stinson 0/9597$3478 GrcreJ2P Duck$56 123 Stinson TW 587$3259 Gotba 010 Bore$22 Fr 928 $20 117 Garbo GtV Bare $39 Pr P28 832 dO Doog 0-AdA abs $32 Fr P2-B$45100 Sibo S38 Arepb$49 inunPif74 TL Peso0 Spec$4360 Eon 150 Sport$36 65 SkyrocketOF5F1$2090 Ba. 105 Sport$49 56 CotWnrhk P40$2490 StinALore Wirrg$56 adSighing P39$3980 Martin 74 T4M 1839 56 RepSen8ee An92475 HPge 0400 Bareb$55 o8Areph$30100 9pg0 0400 Ban$49 J3Cob 65 MChina Clipper udsor Bnrb$3897 MChino Clipper$60 FOFHellcat$2971 Loccson C2 Airlin$24 Bl7GFnrt$296690133 8U Jingre8391 8170 Fart54960 EronWinkle Bird$45 Wbrlreid$2454 Cort Sacilt SF934$20 ocion Lirdberg LSirius nraVOnI$3955 CnckrOind Ftr8orr$32 NO K SAVAILABLEIPrices sobject tochange tber Scales Sians Ftare6 Span Conrylete Pattern Frare 25c Add 10 roollordetslorsbipprng&ins etc OSACon &Meo EIereherradd IS l20sifbyairl Protorral catalog $1 50 Price list sectron alone 55c *l1v Foreign odd $1 001* OCLEYELAND MODEL&SUPPLY Co tB387B 0trrt AsClenelend Ole 44102 March 1984 167 THERE IS DIFFERENCE UT.$450UT.$560 UT.$760 GAL 5GAL 5 GAL 0 $RSM 91880$URUM 00 DRUM $50000 Drums available directly trom tactory Duke Fox flying model airplanes 30s alcohol fuel mixed himoelt early 405 discovered miracle ot nitromethane total world production less quart day has worn Out motors life tests fuel producers ever owned Result knows little about what takes make motor run well last long time Use Fox fuel . costs little motor will last great deal longer Hal LiOB 15011 6d61656 Fox MFG Co $305 TOWSON AVEFOOT SMITH ARK 72901 teshaye turned out Some 18 months o wrote asking information Out ornithopters sent him plans lappergasted along everything knew out thopters wrote head NOW THERES QUICK AND EASY WAY OF CLEANING YOUR MODEL CRAFTS Super-K Model Cleaner Removes fuel Residue dirt contact CUTS CLEANING TIME IN HALF Just spray model solvent wipe soft cloth paper towel SIMPLE AS THAT Leaves craft showcase clean Wont hami Painis Coverings Dries Clear fast Elminates Work cleaning model Strong Professional Quality formula Great Model Craff Bts Planes Helicopters Cleans Gently Protects delicate model DEALERS WANTED DOMESTIC & OVERSEAS WE EXPORT Hurry Have product shelves time Christmas guaranteed top seller Sugg retail $550 per gallon Contact us price structures ordering information Also ask about other Super-K products Model Industry Are Manufacturers & Major Brands Distributors Model Engines Kits Radios & Accessories Sjqer-K orand Kings Radio Control Hobbies International 3960 West 16th Ave Hialeah Florida 33012 Phone 305 557-2024 fields parks other limited areas Major features proposed program include publication how-to-do-it book starting square publication quarterly magazine production low-cost brown-wrapper kits models presented book magazine providing liability insurance members organizing local regional Fun Fly-Ins similar contests no competition developing pro motional instructional program intro duce modeling youth groups schools foment nationwide campaign demonstrate aircraft modeling greatest spare-time activity ever de velopedan art science hobby sport young old rich poor male female information write Fun Fliers PO Box 95 Volant PA 16156 sport tlying opposed com petition flying aspect reminds Will Nakashima cartoon caption went something like fly just fun have fun win Yet another space-age material Getting bag potato chips nowadays enough chore have encountered some mailing envelopes going around Impossible tear material looks sort like doped silkspan its far stronger Alas too heavy Free Flight application could think up ever Ed Lidgard thought bit further splits stuff down whatever thickness needs According Ed name material something like TyvexI cant read writing too welland synthetic-fiber paper made American Excelsior commercial application knows mailing envelopes As produced 006 008-in thick peels stuff apart takes thicker half peels apart finally worries dull knife down thickness 001 002 weight about equal tissue light years ahead tissue strength application inside covering rubber-power fuselage tubes get some stuff hands youll probably figure out dozen applications right off Ed sticks balsa applying Titebond both surfaces crosslinking guess means curing MonoKote iron smooth surface out given coat thin dope make lube-proof Record-breaking Indoor Cabin model Bob Randolph tallied up eighth Indoor Cabin record last July Santa Ana flight 33 mm 37 sec story about last two Cabin records made removable pods landing gear attached Test flights made delicate pod replaced flat plate having same weight drag pod learned drag flat plate slighter greater streamlined form having same cross section Indoor-model speeds flat disc can built much lighter Thus Thin Man born came out total weight 00325 oz intended doing comparative tests using double-cone pod model disc flew very well setting record its third flight fortunate enough win FAI Team Selection Finals have con centrate preparations World Champs Additional Cabin-model develop ment will have wait Im sure use boron filament could get weight down have read rule book rather closely figure out Thin Man qual ifies Cabin model does rubber motor enclosed balsa tube disc attached disc covered both sides microfilm tiny balsa spool separating two surfaces rules require Cabin model have built-up enclosed fuselage little hard see balsa tube qualifies built-up structure However lot Cabin models have built way apparently OK Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued page 78 sets rollers would cut about eight fixed sizes 1/4 flat Pirelli several disadvantagesit could sharpened no possibility making strips slightly smaller larger built-in size would handle /44n wide rubber Finally could get exactly size did want cutter sets also got two three other sizes didnt want same pass Vilim Kmoch Yugoslavia made Rote Shear-type cutter adjustable cuts came very thin wash ers two diameters assembled cutters assembled roller beginning example eight 006-in -thick large-diameter washers fol lowed alternating layers eight small large-diameter wshers made other roller exact mirror image two rollers would overlap form rotao shear After assembly came agonizing trial and-error period adjusted enc pressure washers amount o overlap until satisfactory cut made Although could make several very pre cise sizes washers came three thicknesse allowing choice strip width 002 subtle variations cutting pass adjustment phase consumed several fee precious rubber Other advantages wen Vilims shear could sharpened once adjusted waste less mos strippers type current high-tech strippers cut rubbe off side size rubber strip thl same way meat slicers grocer 168 Model Aviation nun. P-40 CARD KIT FULL COLOR EXACT REPRODUCTION Jacks50 REMEMBER HOW ONWELL THEY FLEW Special offer inciodee cocpoo receining e eno eel hell price Send Fiite Modeis P0 Boo 62MMAR Roseojilo MI 48066 A.UNiCUE NOSTALGIC GIFT SILICONE gso 00 10 foOt COilsTUBING lD.062 09 125uS POST S/coil235 265 325 LARRY DODGE AERO INC 110210 MANNINGSTILLWATER MN 55082