John Preston Safety12 Comes Flint Nortbansmon Sc NW Washington DC 20015 column provided address Items concern regaidng safety aspects model aviation actMdes Content coIunn however opinion author does necessuily represent official position Academy Model Aeronantics Odorless Cya glue Mounting plates Zenoah G-38 engines flutter Hazardous activities Full-scale threat ODORLESS CyA GLUE Allergic reactions fumes emitted cyanoacrylate CyA glue cures have subject num ber previous Safety columns Modelers have developed sensitivity fumes have adopted various solutions problem have ranged use respirator uncomfortable increasing ventilation workshop very practical winter discon tinuing use products unacceptable Well seems Bob Bill Hunter Satel lite City Inc may have hit ultimate solu tion have previously suf fered discomforting allergic reactions Last week returned two-week Christmas vacation England found package delivered UPS contained sam ples two new products known User Friendly Odorless UFO instant glue thin pen etrating glue bottle red label other thick glue used gap filling packaged bottle green label Some may have already seen advertise ments two new glues able subject products al lergy test myself since Ive experienced res piratory problems previously marketed CyA glues However intend pass sam ples friend has experienced such prob lems past willing have him act guinea pig According information sheet accom panied glue samples UFO glues can used directly white foam dissolving Whether have previously suffered reaction CyA glue fumes seems instant glue will work direcfly foam real plus worth giving try under stand UFO glues currently being shipped dealers local hobby empori um doesnt yet stock might request owner put order Comments readers try products welcome Safety alert Periodically receive letters describe problems modeling products authors have experienced Having neither own testing lab nor budget tests con ducted contractor such letters present dilemma Should rely authenticity reports letters andwithout further verificationpass readers should purge reports brand names leave dark whether may have potentially hazardous product pos session copy letter sent Larry Maynard importer received magazine last month forwarded attention Larry added note letter stated safety information should made available users Zenoah G-38 engines letter de scribed potential problem associated mounting plate engine popular among Big Bird modelers Since Larry like professional engineer Im going accept description problem ouflined letter further investigation pass benefit other modelers may own engine Over Larry am very happy owner three Zenoah G 38 engines have mounted 1 Robinhood 99 2 Sig Morrissey Bravo 3 lowwing aircraft derived Bridis Big Bee three aircraft engine Robinhood has far time probably amounts about three four hours engines mounted 1A-in birch plywood box reinforced corners 34-in blocks through-bolted firewall Now other shoe stamped sheet metal mounting plate engine Robinhood has developed cracks must replaced safety reasons received warning owner hobby store Gardena CA caused make careful investiga tion mounting plates have discussed other G-38 owners have experi enced similar problems whenever steel mount ing plate used am professional engineer involved safety design requirements payloads flown Space Shuttle failure modes have experienced hydrogen embrit tlement plated steel parts under cyclic ie vibrational loads often result cracking similar seen mounting plates appropriate solution problem bake plated parts 3250 F no less 23 hours drive Out hydrogen remaining plat ing process purposes intend replace mounting plates %-in-thick 6061 alumi num plates see works out suggest readers may have model powered Zenoah G-38 installed stamped sheet metal mounting plate should take close look plate see sign cracks developing Thank Larry safety alert Continued page 16 14 Model Aviation DONT SEE A4I $1&IJ 0F YOUR GLfl2ER SINCE THE LOW PASS 8 ThAT JET FieI4TLA Flutter Although college education fi nanced aircraft manufacturer am chanical rather aeronautical engineer So aeronautical engineers write take issue something Safety column pertained discipline Im going argue Ill begin letter Charles Richard Lancaster CA Charles disagreed state ment appeared January 1989 column statement actually something dreamed up rather found letter received another mechanical engineer responding previous request formation predict whether particular design will prone flutter Anyway heres Charles opinion just could let comment made January 1989 issue Model Aviation stand out advising error concerning ex planation wing flutter first paragraph page 23 refer enced publication stated rule thumb used designers full-scale aircraft have center-of-gravity wing entire airplane between leading edge wing 25% chord Wrong wrong wrong wrong minimize onset torsional flutter subsequent modes including bending oscillations center-of-twist elastic axis centerof-gravity wing chord should kept ahead quarter-chord section lifting surface short flutter resistant lifting surface should tend twist about axis lies ahead airfoil section quarter-chord subjected bending Also maintain proper location elastic axis important preserve conti Continued page 18 16 Model Aviation Wingspan 45-in 20 40 engnes 3-channel control Introducing Son Mr Rugged Inc Orchard Grove Drive V-----Royal Oak MI 48067 second generation durable model airplane market has arrived new high-lift wing rugged construction before simplified assembly make DuraPlane lithe easiest forgiving way world become model airplane pilot Since original DuraPlane came market two years ago weve listening what customers have say suggestions own research weve refined original design invite try unique model trainer available new DuraPlane Ilwatch skies BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited VFI ND GIANTS FOR GIANT SCALE BUFFS N F 00 7OBa e 12 T60 H era 4 3CHa$8 94CH 74 Doolitrlne 08 11 $48 72 Car02U1 /4 L&5 $46 95 Maroaacpo Sport $36i 108 Car 0201/4 LOS $56 80 Hell Spr Scildag 543 60 Dooglee /4-2 Mail $24 107 Aeronro C3 SF 535- 60 Oceral Balidag Frr 30 62 Hoerard Rena ho $65 59 BrernEece MeLA 854 78 Tamer WW Rac S35107 Orooc Beard F8F $54 63 Car Oaelrh Fl iC $4269 Lindhege NX-21 1 $28 84 Car Caelrlc FlIC $5491 tirrdberge NO-SI 1 $39 66 DeHan Caere Rec $2496 WrNW-lNao Raa $48 —s62 HoecMrMaIIigan $3574 C Helidor SB2C4 855 94 HoocMrMolligan $45 108 PairclrPT19 yr $59 eeirrg F-26A Pr $36 60 Waco Taper-wing $36 84 Baeirg F-26A Pt $48PT Waco Taper-Wing $48i 69 Waco C-6 Cabin $36 75 WeelId Lycarder $32 78 Slog $38 106 Weetld Lyearder 549 6089" 2Fard Triratr 4AT $36 55 Loch 11 Electra $30 76 Fard Trier 4 AT $48 0 83 Loch Electra $40 114 Ford Trier 4 AT $63 62 Stineoc 11W 5B7 $18 96 BeIlonce Aircrai $48 tinean T/W 0B7 826 93 L 122 Otinean T/W 087 $38- 580 59 Brietol F, p2-B $30 780 118 Brintol Pt F2-B 845- 124 74 Tarcer Fence $45 62 56 Car WarInc F-40 $34 83 60 Vagr Cereal F46 $35 77W 80 Va8 Caeair P46 $69 63 C Seahoerk P7C1 $45 Loch Liglrtng P38 $38 94 C Seahoeric F7C1 057 " 56 BnpSeeBee Aer $24 108 Sihar 038 AerpI $49 epSaaBae Aer $39 60 Boeing 100 Spar $36 70 Fipor J3 Cab $29 90 Boeing 100 Sport $49106 Piper J-3 Cob $3P72NarrIrropGeerera $48 i.--j 98 Lack Hadnon Berh $38 96 Northrop Goerero $75 63 Gram F6F Hellcat $28 90 StinA looc 31M $06 77 Banino B17G Farc$35 60 StintA Lana 3fM $42 103 Ban 8170 Fart $55 1205 nsA Leer 3 MOB 68 Weed Whirlermnd $32 78 Cancel Cat FBY5A 042 68 N Aeror Naniac $39 104 Cao Co PET SA $56 Booacea VTail $39 65/4 Cl no CI eper $65 77 [aecanlce Sedan $35 97 /4 Ch no Cl oper $70 NA 820 Bomber $49 62 Cat cc NC 4 6$ toMarooder 826 549 94 Ca NC 4 W c Ste oceracees Beanean elan aloe c*re H Sold rhro Onolere Price cab ect change nec 1400 SOc OF- 6124 Pane Aleroyc led Add 10% order cImiFF ng & ne etc USA Con & Mao Blceerhera ice 10% 125% air* Fietarial catalog $200 lincladec PrIce Lictl Frice icc aceiae aloe $100 aIr foreIgn add $100 LEVELANDMODEL&SUPPLY Co 183878 BETtOfT API CLEVELAND OHIO 44182 oeceeereceaara bee 515 PM0 ST ICr LSSTI{2161 9613600 acOccacececc After glance youve probably already guessed CGX 500 built deliver kind season-after-season reliability can make last power panel youll ever have buy So ask yourself does really make sense settle anything less CARL GOLDBERG could own CCX 500 few dollars MODELS INC have correctly grasped what Charles has said letter solution minimizing inflight failure sheet balsa stabilizer what started discussion flutter may equip stiff hardwood leading edge should move elastic axis point front quarter-chord point Right second letter came Joel Chesler senior flutter analyst Northrop Cor poration prime interest hobby competition Free Flight Joel also took exception statement January 1989 column stated Flutter aviation world torsional vibration wing Joels definition Flutter in-flight instability usually caused coupling two forms vibration may may torsional other typically bending control surface rota tion velocity dependent will occur until critical velocity reached Additionally control surface flutter can caused same mechanisms just described depending relative stiffness associ ated pushrodand inertial characteristics control surface thank both Charles Joel taking Continued page 20 nuity torsional resistant structure through Carry time Largest Only Stock 1 out its span closed tube sufficiently strong 2 All-Balsa Kraft Parts World aft resist hending located ahead quarterchord lifting surface section would ensureARFs ZMP alive working flutter resistance may noted such tube KRAFT can made enclosing upper lower sur face structural sheeting between front spar leading edge form D-shaped closed MIDWEST cell torque box throughout span ILLbLIA Authonzed Warranty ServiceFREQUENCY CONVERSION $1000 Discount Regular Repair Moat Makes Modela Converted Tuning Donewith Spectrum Analyzer ____K- LINE Also Service ME rn/C FutabmtyShad Only Full Time Servicenter Ihe Midwesi ll7East Main St Northvil le Michigan 48167 er 1-313-348-0085 SUkHOI Su-26M th span 68 area 810 sq Ins meter 4strohe 120 cquiv Preass*sled fuselage sheeted plug-in wings sheeted stabtin & ruddef e die epoxy cowl texan canopy & illustrated aaehly menual 18 Model Aviation MONARCH AW Sport Pattern span 66 area 7SOsqins meter 4 stroke 80 G0cujn PreaaamrAled fuselage veneered wing ehaped bales parts texan canopy epoxy cowl Illustratd assly Eanusl c ZIMPRO MARKETING ' posoassssoasnuosneam P40 sIsss-arn Kits P& W Model Service 1935 Miss America 84$71961936 Buccaneer 84$5996 1937 Dallaire 108$75161938 Clipper Mk 172$4156 1938 KIoud King 63$42361939 Powerhouse 84$5356 1939 Record Breaker 96$69561938 Trenton Terror 72$4076 1939 Korda Wake 44$19161939 Mercaty 72$5936 1939 Zipper 54$53561940 Ranger 46$3196 1940 Sailplane 78$94761940 50 Long 50$3036 1941 Brigidier 56$40761941 Super Quaker 78$7276 1941 Playboy Jr 54$31161941 Playboy Sr 80$5116 1941 BroOklyn Dodger 56$4236 Midway Model Co Full Kits 1936 Flying Quaker 84$64761938 Powerhouse 50$2996 1937 Long Cabin 79$47161939 AT Spertoer 50$2956 1937 Quaker Flash 67$45561940 Buzzard Bombshell 1937 Air Chief 61$3596 2spankd$8696 I94ONowRuler74$7116 0spankd$3596 above kits qualify Sass events PP & R/C feature rho highest quality machine cut & sanded parts sheet & strip wood wire & window material Most plans original PP rho models easily convertible 3ch R/C Sailpianes Electric Power Gas Kits MIDWAY MODEL COELECTRIC MODEL DESIGN Gnome HLG 60$2400Sky Knight 44 05 Dl$2400 Gtmme2M Older79$3796EledraGFde II 73 05D$3100 Pant Eddie 050$2400Lightning 36 05 0$2400 Uha Mk IV 080$3796Thennic Traveller 05 Dot 0$3100 Electric Playboy0501$2600 Hobby Hum Sensoar Glider 78 05 electric$1800 Astro Challenger 05 Geared$3250 Astro Vihing 05 Geared$3250 Antro POrtedield 15 25 Geared$5996 Autro Spptt 37 05 Direct$2996 Daveys Robin 05 Geared$3371 Daveys Lu Crate 108 Geared$3596 FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL SNIPPING & HANDLING76 Page CATALOGUE UptO $800 add $200$200 pp/lot Class free $801 $2000 add $250when requested order $2001 84500 add $325 $4501 $7000 add $375HOBBY HORN DEer $7008 add $450 CA Addressees add 6% tue Seed MorOn SI [A] MOVISAIMC#&EapsrCheck OBoc 2212 adore up to38 days tsr chedsWeulminater Ca 92684 clearance 893-8311 COD Esact charges phis $108I-Irs Mon-Fri 9AM 5PM huddling Cash Ordy Hazardous activities Readers frequently draw attention send Copies photographs de picting hazardous activities have appeared either newspapers modeling press Two such letters arrived last month first clipping Texas newspa per dont know sent mod eler shall remain anonymous added caption What wrong picture photo depicted RC Pattern-type model flight moment cut ribbon dedicate completion opening new concrete run way Texas club installed flying field Im assuming wrong act de picted photo ends ribbon being held two club members standing opposite sides new runway have no doubt model being piloted experienced modeler radio interference equip ment failure can occur best us Ive attended fun-flys past featured Limbo event ends limbo rib bon held club members Im convinced good practice want stage Limbo event perform ribbon-cutting model its better support ends ribbon poles keep people behind flight line second letter District IV AVP Char lie Spear drew attention photo ap peared Model Aviation showed win ning float parade featured model aircraft caption under picture stated An other Piper quarter-scale taxiing behind float Since taxiing model pic ture have no way knowing whether its pilot Continued page 22 Span85in Length66 Wing areal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdI $21500 plus shipping *1100 Evaryfiring ht swatch kft pbm piscut od puss moompaoemodel z DILIXI Kit $28500 plus slipping $1106 Evarytbing tuE kit bert wlq spain lastaled wIqa stab turtle dash batch & sbtrsed 1116 balsa MAKES htflUitIO GIJICKI AH wood Gloam construction ~gaas cowl pants 2pi plugin wings airtollod tail surfaces No lull hence wtres reqeired FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 HE Ave. Spirit Lake IA S13MI 20 Model Aviation time write define flutter gatlell TR260 leer Fund Aer&eIic Deaip 1/4 Stand-oIl Scala Kit sjut $10300 plus slipping $1100 Cast pasta campy bnq pm pleas turn uris hr vile tat sartacan tattle duck 5 baleb IKON NWST IKON NWST has largest selection giant scale kits ava abe today offer best value modeling dollar Design Building Integrity Scale Fidelity Scale Flight Characteristics stands d IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS Del-IAVILLAND BEAVER 96$17500TAYLORCRAFT90$15595 107 17600 PORTERFIELD COLLEGIATE 84 14595 64 18750 FAIRCHILD24RANGERI 90 21000 46 6295 PORTERFIELD FLY-ABOUT 80 13750 96 18750 WACO MODEL 10 734 19000 WACO TAPER WING 727 18000 fine kits include ormed landing gear cut parts rol horns cranks ws ls lete plans surfaces fully drawn s pants ity hand selected balsa ow acetate ct spruce ruction manual photos TO ORDER Callordropusaline ipwithin3days ling&Shippingis$75OPerKit IKON NWST ox 306 Dept MA Falls ID 83854 773-9001 MA 1009 loose tether safeguard event some reason engine should suddenly go full throttle want feature taxiing models parade strongly urge tethered some manner pilots Full-scale threat As mentioned earlier column spent Christmas visiting relatives England part visit town Malton about 25 miles east city York close North Yorkshire Moors moorland area populated mostly sheep vast undulating area devoid veg etation except heather also designated low-flying area Royal Air Force training activ ities say low mean LOW told supposed stay under 500 ft grew up area moors perfect place first attempts Free Flight Power Rubber models However Id reluctant fly now because Tomados A- lOs dominate skies give virtually no warning ground-hugging approach Which brings experience described recent letter Doug Inkley modeler now resides Arlington VA Doug fol lowing relate football season University Wyoming Saturday late October pro vided bit Indian summer weather com pelled mc novice RC Glider pilot try lit tle Soaring Laramie small town headed favorite Soaring area plateau just north town grasslands Laramie basin great place inexperienced Glider pilot such myself could land just about anywhere site grassy treeless Continued page 133 Box 1063 Lorain Ohio 44055 Phnn 21 6 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. $750 Light Indoor kits $795 OUTDOOR PEANUT Super Scale. NEW Micro X Hornet P30 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber CO Power Kits 8850 SPORT MODELS An Embryo Model 18 Span designed winl beginners ... $850 HARD-TO-FIND ITEMS Early Bird liesue Antique Aircraft *616 True OldeJapanese Tissue lOin 3 cobra*616 Jepansee Tissue 12 inS colors*916 Mkrolite Silver *316 Microfilm Glue Solvent Condenser Paper 3 sheets*460 Plan Ser1ce over 17 Scale Sport Scala ft Peanut Scale Rubber Strip 020 thru 066each *116 3132 thru 5/32each *260 WinderSi 6 MarkllB1 . *1216 Complete une Brown CO Motors Bales Wood Outdoor ft Indoor Sheets ft Stripe Add 10% Poetage mum Postage *160 COMPIETE CATALOG *110 22 Model Aviation 90 OTHER FINE KITS WE OFFER FAIRCHILD 24CORBEN SUPER ACE WARNER SCALE 80 1/5 SCALE 90 13995 $18475 Bill Eftlnger lie lee geet oboeS ecole RIC ho, GOld. Age bolt eoel obbet poweed ceo nodl etoond 1931 end Owe very beet ecele Ilyot ite ii. bOo deelgoed 1/6 ecelo 9/C verelot thot 00010 boildeto ehoold conoidet neol stoleot Light enoogh tot 020 2-cycle enoog enoogh lot 99 4-cycle 81 wingspan 904 sq wing area 51 overall length Fuselage plywood/balsa Wing built-up 1 piece cantilever Tail Surfaces built-up balsa Landing Gear shock-resistant wire PlanN Pattern #RC6S-1$1495 6 -68 length wing span 13- 23 engines 2268 sq wing area 3 4 channel RIC Plan N Pattern Set #RCQS-1 4$2495 Piper Cub J-31 119 wingspan 2800 sq wing area 90 th 19 lbs 4 channel 20- 30 2-cycle engine Plan N Pattern #RC3S-2$2996 bill rein9, ie bonding otowbot ol AMA AMA-AFFs 1401101 ewot Pricen Oto Coerplete Ploy soh-Ansnwbly end Detilod POtI Liete Add $299 Melilna Tebe Setd lot stoohorer eheod cowd Now bochoto 10wing new Plen set lot tUS Einirlo Power denig, bollotin ,ow itteloded broohore Seed *1 ndebl yoo tiot warn WE Technical Services PO Box 76684A Atlanta GA 30323 FROM IPAVEY YSTEMS ir really slick trainers little hassles building taken out box before open birds simple build pretty look small parts well sides tail feathers pre cut ready quick assembly Youll air flying own faster ever expected -4 BT-20 three channel trainer 15-25 engines Has fully sheeted flat bottom wing can built optional ailerons 50 span 400 sq area AT-50 four channel advanced trainer 19-30 engines scale look flies rock stable like pattern bird has wide speed range Has 50 span semi-symme trical airfoil 400 sq area Both kits feature rolled plans step-by- h step instructions hardware wheel pantsEIVEY675 TOWER LANE formed gear accurately die andYSTEMSWEST CHESTER PA 19380 machine cut selected woods EoRPORATIoN 215-430-8645 Safety/Preston Continued page 22 some seven miles removed local air port Out normal flightpaths What didnt know about football turned out important day Unknown UW playing Air Force Academy Fal cons brought football team cheerlead ers prairie falcon AND jet fighters low-level pass over stadium several fight ers scheduled halftime self would have problem loca tion slightly above stadium altitude just half-mile north directly flightpath aircraft about wow thousands spectators low-level pass would have fine sky fighters came low-level approach stadium Fortunately lower damn close Glider fighters simultaneously field vision jets looked big pass sudden low fast loud completely unnerved lost control Glider Fortunately companions brought senses landed safely However didnt go back up again thought another pass might made fighters wasnt Having just buzzed extremely lowflying aircraft RAF can identify Dougs momentary disorientation ended letter stating Always always alert care ful attentive cant too careful should always prepared unex pected echo message Have another safe month April 1989 133 GETTING AIRBORNE VOLUME ALL ABOUT BUILDING FLYING COVERING ENGINES AND MORE GETlNG AIRBORNE VOLUME ONE has over 400 large detailed photographs includes topics like selecting radio radio control works learning fly instructor learning Instructor learn basic maneuvers like landing Other chapters explain about ARFs field equipment operating engines assembling airplane easy learning control Installations much cat Number BOKOO9$1295 GETTING AIRBORNE VOLUME TWO includes topics like building strength appearance alignment New plastic film covering techniques developed experts beginner explain get nicad batteries rebuild servo engine airframe Additional installations topics shown much cat Number BOKOl 0$1295 HARRY 8 HIGLEY & SONS INC P o sox 532 GLENwOOD ILL 60425 GETTING AIRBORNE
Edition: Model Aviation - 1989/04
Page Numbers: 14, 16, 18, 20, 22, 133
John Preston Safety12 Comes Flint Nortbansmon Sc NW Washington DC 20015 column provided address Items concern regaidng safety aspects model aviation actMdes Content coIunn however opinion author does necessuily represent official position Academy Model Aeronantics Odorless Cya glue Mounting plates Zenoah G-38 engines flutter Hazardous activities Full-scale threat ODORLESS CyA GLUE Allergic reactions fumes emitted cyanoacrylate CyA glue cures have subject num ber previous Safety columns Modelers have developed sensitivity fumes have adopted various solutions problem have ranged use respirator uncomfortable increasing ventilation workshop very practical winter discon tinuing use products unacceptable Well seems Bob Bill Hunter Satel lite City Inc may have hit ultimate solu tion have previously suf fered discomforting allergic reactions Last week returned two-week Christmas vacation England found package delivered UPS contained sam ples two new products known User Friendly Odorless UFO instant glue thin pen etrating glue bottle red label other thick glue used gap filling packaged bottle green label Some may have already seen advertise ments two new glues able subject products al lergy test myself since Ive experienced res piratory problems previously marketed CyA glues However intend pass sam ples friend has experienced such prob lems past willing have him act guinea pig According information sheet accom panied glue samples UFO glues can used directly white foam dissolving Whether have previously suffered reaction CyA glue fumes seems instant glue will work direcfly foam real plus worth giving try under stand UFO glues currently being shipped dealers local hobby empori um doesnt yet stock might request owner put order Comments readers try products welcome Safety alert Periodically receive letters describe problems modeling products authors have experienced Having neither own testing lab nor budget tests con ducted contractor such letters present dilemma Should rely authenticity reports letters andwithout further verificationpass readers should purge reports brand names leave dark whether may have potentially hazardous product pos session copy letter sent Larry Maynard importer received magazine last month forwarded attention Larry added note letter stated safety information should made available users Zenoah G-38 engines letter de scribed potential problem associated mounting plate engine popular among Big Bird modelers Since Larry like professional engineer Im going accept description problem ouflined letter further investigation pass benefit other modelers may own engine Over Larry am very happy owner three Zenoah G 38 engines have mounted 1 Robinhood 99 2 Sig Morrissey Bravo 3 lowwing aircraft derived Bridis Big Bee three aircraft engine Robinhood has far time probably amounts about three four hours engines mounted 1A-in birch plywood box reinforced corners 34-in blocks through-bolted firewall Now other shoe stamped sheet metal mounting plate engine Robinhood has developed cracks must replaced safety reasons received warning owner hobby store Gardena CA caused make careful investiga tion mounting plates have discussed other G-38 owners have experi enced similar problems whenever steel mount ing plate used am professional engineer involved safety design requirements payloads flown Space Shuttle failure modes have experienced hydrogen embrit tlement plated steel parts under cyclic ie vibrational loads often result cracking similar seen mounting plates appropriate solution problem bake plated parts 3250 F no less 23 hours drive Out hydrogen remaining plat ing process purposes intend replace mounting plates %-in-thick 6061 alumi num plates see works out suggest readers may have model powered Zenoah G-38 installed stamped sheet metal mounting plate should take close look plate see sign cracks developing Thank Larry safety alert Continued page 16 14 Model Aviation DONT SEE A4I $1&IJ 0F YOUR GLfl2ER SINCE THE LOW PASS 8 ThAT JET FieI4TLA Flutter Although college education fi nanced aircraft manufacturer am chanical rather aeronautical engineer So aeronautical engineers write take issue something Safety column pertained discipline Im going argue Ill begin letter Charles Richard Lancaster CA Charles disagreed state ment appeared January 1989 column statement actually something dreamed up rather found letter received another mechanical engineer responding previous request formation predict whether particular design will prone flutter Anyway heres Charles opinion just could let comment made January 1989 issue Model Aviation stand out advising error concerning ex planation wing flutter first paragraph page 23 refer enced publication stated rule thumb used designers full-scale aircraft have center-of-gravity wing entire airplane between leading edge wing 25% chord Wrong wrong wrong wrong minimize onset torsional flutter subsequent modes including bending oscillations center-of-twist elastic axis centerof-gravity wing chord should kept ahead quarter-chord section lifting surface short flutter resistant lifting surface should tend twist about axis lies ahead airfoil section quarter-chord subjected bending Also maintain proper location elastic axis important preserve conti Continued page 18 16 Model Aviation Wingspan 45-in 20 40 engnes 3-channel control Introducing Son Mr Rugged Inc Orchard Grove Drive V-----Royal Oak MI 48067 second generation durable model airplane market has arrived new high-lift wing rugged construction before simplified assembly make DuraPlane lithe easiest forgiving way world become model airplane pilot Since original DuraPlane came market two years ago weve listening what customers have say suggestions own research weve refined original design invite try unique model trainer available new DuraPlane Ilwatch skies BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited VFI ND GIANTS FOR GIANT SCALE BUFFS N F 00 7OBa e 12 T60 H era 4 3CHa$8 94CH 74 Doolitrlne 08 11 $48 72 Car02U1 /4 L&5 $46 95 Maroaacpo Sport $36i 108 Car 0201/4 LOS $56 80 Hell Spr Scildag 543 60 Dooglee /4-2 Mail $24 107 Aeronro C3 SF 535- 60 Oceral Balidag Frr 30 62 Hoerard Rena ho $65 59 BrernEece MeLA 854 78 Tamer WW Rac S35107 Orooc Beard F8F $54 63 Car Oaelrh Fl iC $4269 Lindhege NX-21 1 $28 84 Car Caelrlc FlIC $5491 tirrdberge NO-SI 1 $39 66 DeHan Caere Rec $2496 WrNW-lNao Raa $48 —s62 HoecMrMaIIigan $3574 C Helidor SB2C4 855 94 HoocMrMolligan $45 108 PairclrPT19 yr $59 eeirrg F-26A Pr $36 60 Waco Taper-wing $36 84 Baeirg F-26A Pt $48PT Waco Taper-Wing $48i 69 Waco C-6 Cabin $36 75 WeelId Lycarder $32 78 Slog $38 106 Weetld Lyearder 549 6089" 2Fard Triratr 4AT $36 55 Loch 11 Electra $30 76 Fard Trier 4 AT $48 0 83 Loch Electra $40 114 Ford Trier 4 AT $63 62 Stineoc 11W 5B7 $18 96 BeIlonce Aircrai $48 tinean T/W 0B7 826 93 L 122 Otinean T/W 087 $38- 580 59 Brietol F, p2-B $30 780 118 Brintol Pt F2-B 845- 124 74 Tarcer Fence $45 62 56 Car WarInc F-40 $34 83 60 Vagr Cereal F46 $35 77W 80 Va8 Caeair P46 $69 63 C Seahoerk P7C1 $45 Loch Liglrtng P38 $38 94 C Seahoeric F7C1 057 " 56 BnpSeeBee Aer $24 108 Sihar 038 AerpI $49 epSaaBae Aer $39 60 Boeing 100 Spar $36 70 Fipor J3 Cab $29 90 Boeing 100 Sport $49106 Piper J-3 Cob $3P72NarrIrropGeerera $48 i.--j 98 Lack Hadnon Berh $38 96 Northrop Goerero $75 63 Gram F6F Hellcat $28 90 StinA looc 31M $06 77 Banino B17G Farc$35 60 StintA Lana 3fM $42 103 Ban 8170 Fart $55 1205 nsA Leer 3 MOB 68 Weed Whirlermnd $32 78 Cancel Cat FBY5A 042 68 N Aeror Naniac $39 104 Cao Co PET SA $56 Booacea VTail $39 65/4 Cl no CI eper $65 77 [aecanlce Sedan $35 97 /4 Ch no Cl oper $70 NA 820 Bomber $49 62 Cat cc NC 4 6$ toMarooder 826 549 94 Ca NC 4 W c Ste oceracees Beanean elan aloe c*re H Sold rhro Onolere Price cab ect change nec 1400 SOc OF- 6124 Pane Aleroyc led Add 10% order cImiFF ng & ne etc USA Con & Mao Blceerhera ice 10% 125% air* Fietarial catalog $200 lincladec PrIce Lictl Frice icc aceiae aloe $100 aIr foreIgn add $100 LEVELANDMODEL&SUPPLY Co 183878 BETtOfT API CLEVELAND OHIO 44182 oeceeereceaara bee 515 PM0 ST ICr LSSTI{2161 9613600 acOccacececc After glance youve probably already guessed CGX 500 built deliver kind season-after-season reliability can make last power panel youll ever have buy So ask yourself does really make sense settle anything less CARL GOLDBERG could own CCX 500 few dollars MODELS INC have correctly grasped what Charles has said letter solution minimizing inflight failure sheet balsa stabilizer what started discussion flutter may equip stiff hardwood leading edge should move elastic axis point front quarter-chord point Right second letter came Joel Chesler senior flutter analyst Northrop Cor poration prime interest hobby competition Free Flight Joel also took exception statement January 1989 column stated Flutter aviation world torsional vibration wing Joels definition Flutter in-flight instability usually caused coupling two forms vibration may may torsional other typically bending control surface rota tion velocity dependent will occur until critical velocity reached Additionally control surface flutter can caused same mechanisms just described depending relative stiffness associ ated pushrodand inertial characteristics control surface thank both Charles Joel taking Continued page 20 nuity torsional resistant structure through Carry time Largest Only Stock 1 out its span closed tube sufficiently strong 2 All-Balsa Kraft Parts World aft resist hending located ahead quarterchord lifting surface section would ensureARFs ZMP alive working flutter resistance may noted such tube KRAFT can made enclosing upper lower sur face structural sheeting between front spar leading edge form D-shaped closed MIDWEST cell torque box throughout span ILLbLIA Authonzed Warranty ServiceFREQUENCY CONVERSION $1000 Discount Regular Repair Moat Makes Modela Converted Tuning Donewith Spectrum Analyzer ____K- LINE Also Service ME rn/C FutabmtyShad Only Full Time Servicenter Ihe Midwesi ll7East Main St Northvil le Michigan 48167 er 1-313-348-0085 SUkHOI Su-26M th span 68 area 810 sq Ins meter 4strohe 120 cquiv Preass*sled fuselage sheeted plug-in wings sheeted stabtin & ruddef e die epoxy cowl texan canopy & illustrated aaehly menual 18 Model Aviation MONARCH AW Sport Pattern span 66 area 7SOsqins meter 4 stroke 80 G0cujn PreaaamrAled fuselage veneered wing ehaped bales parts texan canopy epoxy cowl Illustratd assly Eanusl c ZIMPRO MARKETING ' posoassssoasnuosneam P40 sIsss-arn Kits P& W Model Service 1935 Miss America 84$71961936 Buccaneer 84$5996 1937 Dallaire 108$75161938 Clipper Mk 172$4156 1938 KIoud King 63$42361939 Powerhouse 84$5356 1939 Record Breaker 96$69561938 Trenton Terror 72$4076 1939 Korda Wake 44$19161939 Mercaty 72$5936 1939 Zipper 54$53561940 Ranger 46$3196 1940 Sailplane 78$94761940 50 Long 50$3036 1941 Brigidier 56$40761941 Super Quaker 78$7276 1941 Playboy Jr 54$31161941 Playboy Sr 80$5116 1941 BroOklyn Dodger 56$4236 Midway Model Co Full Kits 1936 Flying Quaker 84$64761938 Powerhouse 50$2996 1937 Long Cabin 79$47161939 AT Spertoer 50$2956 1937 Quaker Flash 67$45561940 Buzzard Bombshell 1937 Air Chief 61$3596 2spankd$8696 I94ONowRuler74$7116 0spankd$3596 above kits qualify Sass events PP & R/C feature rho highest quality machine cut & sanded parts sheet & strip wood wire & window material Most plans original PP rho models easily convertible 3ch R/C Sailpianes Electric Power Gas Kits MIDWAY MODEL COELECTRIC MODEL DESIGN Gnome HLG 60$2400Sky Knight 44 05 Dl$2400 Gtmme2M Older79$3796EledraGFde II 73 05D$3100 Pant Eddie 050$2400Lightning 36 05 0$2400 Uha Mk IV 080$3796Thennic Traveller 05 Dot 0$3100 Electric Playboy0501$2600 Hobby Hum Sensoar Glider 78 05 electric$1800 Astro Challenger 05 Geared$3250 Astro Vihing 05 Geared$3250 Antro POrtedield 15 25 Geared$5996 Autro Spptt 37 05 Direct$2996 Daveys Robin 05 Geared$3371 Daveys Lu Crate 108 Geared$3596 FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL SNIPPING & HANDLING76 Page CATALOGUE UptO $800 add $200$200 pp/lot Class free $801 $2000 add $250when requested order $2001 84500 add $325 $4501 $7000 add $375HOBBY HORN DEer $7008 add $450 CA Addressees add 6% tue Seed MorOn SI [A] MOVISAIMC#&EapsrCheck OBoc 2212 adore up to38 days tsr chedsWeulminater Ca 92684 clearance 893-8311 COD Esact charges phis $108I-Irs Mon-Fri 9AM 5PM huddling Cash Ordy Hazardous activities Readers frequently draw attention send Copies photographs de picting hazardous activities have appeared either newspapers modeling press Two such letters arrived last month first clipping Texas newspa per dont know sent mod eler shall remain anonymous added caption What wrong picture photo depicted RC Pattern-type model flight moment cut ribbon dedicate completion opening new concrete run way Texas club installed flying field Im assuming wrong act de picted photo ends ribbon being held two club members standing opposite sides new runway have no doubt model being piloted experienced modeler radio interference equip ment failure can occur best us Ive attended fun-flys past featured Limbo event ends limbo rib bon held club members Im convinced good practice want stage Limbo event perform ribbon-cutting model its better support ends ribbon poles keep people behind flight line second letter District IV AVP Char lie Spear drew attention photo ap peared Model Aviation showed win ning float parade featured model aircraft caption under picture stated An other Piper quarter-scale taxiing behind float Since taxiing model pic ture have no way knowing whether its pilot Continued page 22 Span85in Length66 Wing areal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdI $21500 plus shipping *1100 Evaryfiring ht swatch kft pbm piscut od puss moompaoemodel z DILIXI Kit $28500 plus slipping $1106 Evarytbing tuE kit bert wlq spain lastaled wIqa stab turtle dash batch & sbtrsed 1116 balsa MAKES htflUitIO GIJICKI AH wood Gloam construction ~gaas cowl pants 2pi plugin wings airtollod tail surfaces No lull hence wtres reqeired FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 HE Ave. Spirit Lake IA S13MI 20 Model Aviation time write define flutter gatlell TR260 leer Fund Aer&eIic Deaip 1/4 Stand-oIl Scala Kit sjut $10300 plus slipping $1100 Cast pasta campy bnq pm pleas turn uris hr vile tat sartacan tattle duck 5 baleb IKON NWST IKON NWST has largest selection giant scale kits ava abe today offer best value modeling dollar Design Building Integrity Scale Fidelity Scale Flight Characteristics stands d IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS Del-IAVILLAND BEAVER 96$17500TAYLORCRAFT90$15595 107 17600 PORTERFIELD COLLEGIATE 84 14595 64 18750 FAIRCHILD24RANGERI 90 21000 46 6295 PORTERFIELD FLY-ABOUT 80 13750 96 18750 WACO MODEL 10 734 19000 WACO TAPER WING 727 18000 fine kits include ormed landing gear cut parts rol horns cranks ws ls lete plans surfaces fully drawn s pants ity hand selected balsa ow acetate ct spruce ruction manual photos TO ORDER Callordropusaline ipwithin3days ling&Shippingis$75OPerKit IKON NWST ox 306 Dept MA Falls ID 83854 773-9001 MA 1009 loose tether safeguard event some reason engine should suddenly go full throttle want feature taxiing models parade strongly urge tethered some manner pilots Full-scale threat As mentioned earlier column spent Christmas visiting relatives England part visit town Malton about 25 miles east city York close North Yorkshire Moors moorland area populated mostly sheep vast undulating area devoid veg etation except heather also designated low-flying area Royal Air Force training activ ities say low mean LOW told supposed stay under 500 ft grew up area moors perfect place first attempts Free Flight Power Rubber models However Id reluctant fly now because Tomados A- lOs dominate skies give virtually no warning ground-hugging approach Which brings experience described recent letter Doug Inkley modeler now resides Arlington VA Doug fol lowing relate football season University Wyoming Saturday late October pro vided bit Indian summer weather com pelled mc novice RC Glider pilot try lit tle Soaring Laramie small town headed favorite Soaring area plateau just north town grasslands Laramie basin great place inexperienced Glider pilot such myself could land just about anywhere site grassy treeless Continued page 133 Box 1063 Lorain Ohio 44055 Phnn 21 6 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. $750 Light Indoor kits $795 OUTDOOR PEANUT Super Scale. NEW Micro X Hornet P30 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber CO Power Kits 8850 SPORT MODELS An Embryo Model 18 Span designed winl beginners ... $850 HARD-TO-FIND ITEMS Early Bird liesue Antique Aircraft *616 True OldeJapanese Tissue lOin 3 cobra*616 Jepansee Tissue 12 inS colors*916 Mkrolite Silver *316 Microfilm Glue Solvent Condenser Paper 3 sheets*460 Plan Ser1ce over 17 Scale Sport Scala ft Peanut Scale Rubber Strip 020 thru 066each *116 3132 thru 5/32each *260 WinderSi 6 MarkllB1 . *1216 Complete une Brown CO Motors Bales Wood Outdoor ft Indoor Sheets ft Stripe Add 10% Poetage mum Postage *160 COMPIETE CATALOG *110 22 Model Aviation 90 OTHER FINE KITS WE OFFER FAIRCHILD 24CORBEN SUPER ACE WARNER SCALE 80 1/5 SCALE 90 13995 $18475 Bill Eftlnger lie lee geet oboeS ecole RIC ho, GOld. Age bolt eoel obbet poweed ceo nodl etoond 1931 end Owe very beet ecele Ilyot ite ii. bOo deelgoed 1/6 ecelo 9/C verelot thot 00010 boildeto ehoold conoidet neol stoleot Light enoogh tot 020 2-cycle enoog enoogh lot 99 4-cycle 81 wingspan 904 sq wing area 51 overall length Fuselage plywood/balsa Wing built-up 1 piece cantilever Tail Surfaces built-up balsa Landing Gear shock-resistant wire PlanN Pattern #RC6S-1$1495 6 -68 length wing span 13- 23 engines 2268 sq wing area 3 4 channel RIC Plan N Pattern Set #RCQS-1 4$2495 Piper Cub J-31 119 wingspan 2800 sq wing area 90 th 19 lbs 4 channel 20- 30 2-cycle engine Plan N Pattern #RC3S-2$2996 bill rein9, ie bonding otowbot ol AMA AMA-AFFs 1401101 ewot Pricen Oto Coerplete Ploy soh-Ansnwbly end Detilod POtI Liete Add $299 Melilna Tebe Setd lot stoohorer eheod cowd Now bochoto 10wing new Plen set lot tUS Einirlo Power denig, bollotin ,ow itteloded broohore Seed *1 ndebl yoo tiot warn WE Technical Services PO Box 76684A Atlanta GA 30323 FROM IPAVEY YSTEMS ir really slick trainers little hassles building taken out box before open birds simple build pretty look small parts well sides tail feathers pre cut ready quick assembly Youll air flying own faster ever expected -4 BT-20 three channel trainer 15-25 engines Has fully sheeted flat bottom wing can built optional ailerons 50 span 400 sq area AT-50 four channel advanced trainer 19-30 engines scale look flies rock stable like pattern bird has wide speed range Has 50 span semi-symme trical airfoil 400 sq area Both kits feature rolled plans step-by- h step instructions hardware wheel pantsEIVEY675 TOWER LANE formed gear accurately die andYSTEMSWEST CHESTER PA 19380 machine cut selected woods EoRPORATIoN 215-430-8645 Safety/Preston Continued page 22 some seven miles removed local air port Out normal flightpaths What didnt know about football turned out important day Unknown UW playing Air Force Academy Fal cons brought football team cheerlead ers prairie falcon AND jet fighters low-level pass over stadium several fight ers scheduled halftime self would have problem loca tion slightly above stadium altitude just half-mile north directly flightpath aircraft about wow thousands spectators low-level pass would have fine sky fighters came low-level approach stadium Fortunately lower damn close Glider fighters simultaneously field vision jets looked big pass sudden low fast loud completely unnerved lost control Glider Fortunately companions brought senses landed safely However didnt go back up again thought another pass might made fighters wasnt Having just buzzed extremely lowflying aircraft RAF can identify Dougs momentary disorientation ended letter stating Always always alert care ful attentive cant too careful should always prepared unex pected echo message Have another safe month April 1989 133 GETTING AIRBORNE VOLUME ALL ABOUT BUILDING FLYING COVERING ENGINES AND MORE GETlNG AIRBORNE VOLUME ONE has over 400 large detailed photographs includes topics like selecting radio radio control works learning fly instructor learning Instructor learn basic maneuvers like landing Other chapters explain about ARFs field equipment operating engines assembling airplane easy learning control Installations much cat Number BOKOO9$1295 GETTING AIRBORNE VOLUME TWO includes topics like building strength appearance alignment New plastic film covering techniques developed experts beginner explain get nicad batteries rebuild servo engine airframe Additional installations topics shown much cat Number BOKOl 0$1295 HARRY 8 HIGLEY & SONS INC P o sox 532 GLENwOOD ILL 60425 GETTING AIRBORNE
Edition: Model Aviation - 1989/04
Page Numbers: 14, 16, 18, 20, 22, 133
John Preston Safety12 Comes Flint Nortbansmon Sc NW Washington DC 20015 column provided address Items concern regaidng safety aspects model aviation actMdes Content coIunn however opinion author does necessuily represent official position Academy Model Aeronantics Odorless Cya glue Mounting plates Zenoah G-38 engines flutter Hazardous activities Full-scale threat ODORLESS CyA GLUE Allergic reactions fumes emitted cyanoacrylate CyA glue cures have subject num ber previous Safety columns Modelers have developed sensitivity fumes have adopted various solutions problem have ranged use respirator uncomfortable increasing ventilation workshop very practical winter discon tinuing use products unacceptable Well seems Bob Bill Hunter Satel lite City Inc may have hit ultimate solu tion have previously suf fered discomforting allergic reactions Last week returned two-week Christmas vacation England found package delivered UPS contained sam ples two new products known User Friendly Odorless UFO instant glue thin pen etrating glue bottle red label other thick glue used gap filling packaged bottle green label Some may have already seen advertise ments two new glues able subject products al lergy test myself since Ive experienced res piratory problems previously marketed CyA glues However intend pass sam ples friend has experienced such prob lems past willing have him act guinea pig According information sheet accom panied glue samples UFO glues can used directly white foam dissolving Whether have previously suffered reaction CyA glue fumes seems instant glue will work direcfly foam real plus worth giving try under stand UFO glues currently being shipped dealers local hobby empori um doesnt yet stock might request owner put order Comments readers try products welcome Safety alert Periodically receive letters describe problems modeling products authors have experienced Having neither own testing lab nor budget tests con ducted contractor such letters present dilemma Should rely authenticity reports letters andwithout further verificationpass readers should purge reports brand names leave dark whether may have potentially hazardous product pos session copy letter sent Larry Maynard importer received magazine last month forwarded attention Larry added note letter stated safety information should made available users Zenoah G-38 engines letter de scribed potential problem associated mounting plate engine popular among Big Bird modelers Since Larry like professional engineer Im going accept description problem ouflined letter further investigation pass benefit other modelers may own engine Over Larry am very happy owner three Zenoah G 38 engines have mounted 1 Robinhood 99 2 Sig Morrissey Bravo 3 lowwing aircraft derived Bridis Big Bee three aircraft engine Robinhood has far time probably amounts about three four hours engines mounted 1A-in birch plywood box reinforced corners 34-in blocks through-bolted firewall Now other shoe stamped sheet metal mounting plate engine Robinhood has developed cracks must replaced safety reasons received warning owner hobby store Gardena CA caused make careful investiga tion mounting plates have discussed other G-38 owners have experi enced similar problems whenever steel mount ing plate used am professional engineer involved safety design requirements payloads flown Space Shuttle failure modes have experienced hydrogen embrit tlement plated steel parts under cyclic ie vibrational loads often result cracking similar seen mounting plates appropriate solution problem bake plated parts 3250 F no less 23 hours drive Out hydrogen remaining plat ing process purposes intend replace mounting plates %-in-thick 6061 alumi num plates see works out suggest readers may have model powered Zenoah G-38 installed stamped sheet metal mounting plate should take close look plate see sign cracks developing Thank Larry safety alert Continued page 16 14 Model Aviation DONT SEE A4I $1&IJ 0F YOUR GLfl2ER SINCE THE LOW PASS 8 ThAT JET FieI4TLA Flutter Although college education fi nanced aircraft manufacturer am chanical rather aeronautical engineer So aeronautical engineers write take issue something Safety column pertained discipline Im going argue Ill begin letter Charles Richard Lancaster CA Charles disagreed state ment appeared January 1989 column statement actually something dreamed up rather found letter received another mechanical engineer responding previous request formation predict whether particular design will prone flutter Anyway heres Charles opinion just could let comment made January 1989 issue Model Aviation stand out advising error concerning ex planation wing flutter first paragraph page 23 refer enced publication stated rule thumb used designers full-scale aircraft have center-of-gravity wing entire airplane between leading edge wing 25% chord Wrong wrong wrong wrong minimize onset torsional flutter subsequent modes including bending oscillations center-of-twist elastic axis centerof-gravity wing chord should kept ahead quarter-chord section lifting surface short flutter resistant lifting surface should tend twist about axis lies ahead airfoil section quarter-chord subjected bending Also maintain proper location elastic axis important preserve conti Continued page 18 16 Model Aviation Wingspan 45-in 20 40 engnes 3-channel control Introducing Son Mr Rugged Inc Orchard Grove Drive V-----Royal Oak MI 48067 second generation durable model airplane market has arrived new high-lift wing rugged construction before simplified assembly make DuraPlane lithe easiest forgiving way world become model airplane pilot Since original DuraPlane came market two years ago weve listening what customers have say suggestions own research weve refined original design invite try unique model trainer available new DuraPlane Ilwatch skies BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited VFI ND GIANTS FOR GIANT SCALE BUFFS N F 00 7OBa e 12 T60 H era 4 3CHa$8 94CH 74 Doolitrlne 08 11 $48 72 Car02U1 /4 L&5 $46 95 Maroaacpo Sport $36i 108 Car 0201/4 LOS $56 80 Hell Spr Scildag 543 60 Dooglee /4-2 Mail $24 107 Aeronro C3 SF 535- 60 Oceral Balidag Frr 30 62 Hoerard Rena ho $65 59 BrernEece MeLA 854 78 Tamer WW Rac S35107 Orooc Beard F8F $54 63 Car Oaelrh Fl iC $4269 Lindhege NX-21 1 $28 84 Car Caelrlc FlIC $5491 tirrdberge NO-SI 1 $39 66 DeHan Caere Rec $2496 WrNW-lNao Raa $48 —s62 HoecMrMaIIigan $3574 C Helidor SB2C4 855 94 HoocMrMolligan $45 108 PairclrPT19 yr $59 eeirrg F-26A Pr $36 60 Waco Taper-wing $36 84 Baeirg F-26A Pt $48PT Waco Taper-Wing $48i 69 Waco C-6 Cabin $36 75 WeelId Lycarder $32 78 Slog $38 106 Weetld Lyearder 549 6089" 2Fard Triratr 4AT $36 55 Loch 11 Electra $30 76 Fard Trier 4 AT $48 0 83 Loch Electra $40 114 Ford Trier 4 AT $63 62 Stineoc 11W 5B7 $18 96 BeIlonce Aircrai $48 tinean T/W 0B7 826 93 L 122 Otinean T/W 087 $38- 580 59 Brietol F, p2-B $30 780 118 Brintol Pt F2-B 845- 124 74 Tarcer Fence $45 62 56 Car WarInc F-40 $34 83 60 Vagr Cereal F46 $35 77W 80 Va8 Caeair P46 $69 63 C Seahoerk P7C1 $45 Loch Liglrtng P38 $38 94 C Seahoeric F7C1 057 " 56 BnpSeeBee Aer $24 108 Sihar 038 AerpI $49 epSaaBae Aer $39 60 Boeing 100 Spar $36 70 Fipor J3 Cab $29 90 Boeing 100 Sport $49106 Piper J-3 Cob $3P72NarrIrropGeerera $48 i.--j 98 Lack Hadnon Berh $38 96 Northrop Goerero $75 63 Gram F6F Hellcat $28 90 StinA looc 31M $06 77 Banino B17G Farc$35 60 StintA Lana 3fM $42 103 Ban 8170 Fart $55 1205 nsA Leer 3 MOB 68 Weed Whirlermnd $32 78 Cancel Cat FBY5A 042 68 N Aeror Naniac $39 104 Cao Co PET SA $56 Booacea VTail $39 65/4 Cl no CI eper $65 77 [aecanlce Sedan $35 97 /4 Ch no Cl oper $70 NA 820 Bomber $49 62 Cat cc NC 4 6$ toMarooder 826 549 94 Ca NC 4 W c Ste oceracees Beanean elan aloe c*re H Sold rhro Onolere Price cab ect change nec 1400 SOc OF- 6124 Pane Aleroyc led Add 10% order cImiFF ng & ne etc USA Con & Mao Blceerhera ice 10% 125% air* Fietarial catalog $200 lincladec PrIce Lictl Frice icc aceiae aloe $100 aIr foreIgn add $100 LEVELANDMODEL&SUPPLY Co 183878 BETtOfT API CLEVELAND OHIO 44182 oeceeereceaara bee 515 PM0 ST ICr LSSTI{2161 9613600 acOccacececc After glance youve probably already guessed CGX 500 built deliver kind season-after-season reliability can make last power panel youll ever have buy So ask yourself does really make sense settle anything less CARL GOLDBERG could own CCX 500 few dollars MODELS INC have correctly grasped what Charles has said letter solution minimizing inflight failure sheet balsa stabilizer what started discussion flutter may equip stiff hardwood leading edge should move elastic axis point front quarter-chord point Right second letter came Joel Chesler senior flutter analyst Northrop Cor poration prime interest hobby competition Free Flight Joel also took exception statement January 1989 column stated Flutter aviation world torsional vibration wing Joels definition Flutter in-flight instability usually caused coupling two forms vibration may may torsional other typically bending control surface rota tion velocity dependent will occur until critical velocity reached Additionally control surface flutter can caused same mechanisms just described depending relative stiffness associ ated pushrodand inertial characteristics control surface thank both Charles Joel taking Continued page 20 nuity torsional resistant structure through Carry time Largest Only Stock 1 out its span closed tube sufficiently strong 2 All-Balsa Kraft Parts World aft resist hending located ahead quarterchord lifting surface section would ensureARFs ZMP alive working flutter resistance may noted such tube KRAFT can made enclosing upper lower sur face structural sheeting between front spar leading edge form D-shaped closed MIDWEST cell torque box throughout span ILLbLIA Authonzed Warranty ServiceFREQUENCY CONVERSION $1000 Discount Regular Repair Moat Makes Modela Converted Tuning Donewith Spectrum Analyzer ____K- LINE Also Service ME rn/C FutabmtyShad Only Full Time Servicenter Ihe Midwesi ll7East Main St Northvil le Michigan 48167 er 1-313-348-0085 SUkHOI Su-26M th span 68 area 810 sq Ins meter 4strohe 120 cquiv Preass*sled fuselage sheeted plug-in wings sheeted stabtin & ruddef e die epoxy cowl texan canopy & illustrated aaehly menual 18 Model Aviation MONARCH AW Sport Pattern span 66 area 7SOsqins meter 4 stroke 80 G0cujn PreaaamrAled fuselage veneered wing ehaped bales parts texan canopy epoxy cowl Illustratd assly Eanusl c ZIMPRO MARKETING ' posoassssoasnuosneam P40 sIsss-arn Kits P& W Model Service 1935 Miss America 84$71961936 Buccaneer 84$5996 1937 Dallaire 108$75161938 Clipper Mk 172$4156 1938 KIoud King 63$42361939 Powerhouse 84$5356 1939 Record Breaker 96$69561938 Trenton Terror 72$4076 1939 Korda Wake 44$19161939 Mercaty 72$5936 1939 Zipper 54$53561940 Ranger 46$3196 1940 Sailplane 78$94761940 50 Long 50$3036 1941 Brigidier 56$40761941 Super Quaker 78$7276 1941 Playboy Jr 54$31161941 Playboy Sr 80$5116 1941 BroOklyn Dodger 56$4236 Midway Model Co Full Kits 1936 Flying Quaker 84$64761938 Powerhouse 50$2996 1937 Long Cabin 79$47161939 AT Spertoer 50$2956 1937 Quaker Flash 67$45561940 Buzzard Bombshell 1937 Air Chief 61$3596 2spankd$8696 I94ONowRuler74$7116 0spankd$3596 above kits qualify Sass events PP & R/C feature rho highest quality machine cut & sanded parts sheet & strip wood wire & window material Most plans original PP rho models easily convertible 3ch R/C Sailpianes Electric Power Gas Kits MIDWAY MODEL COELECTRIC MODEL DESIGN Gnome HLG 60$2400Sky Knight 44 05 Dl$2400 Gtmme2M Older79$3796EledraGFde II 73 05D$3100 Pant Eddie 050$2400Lightning 36 05 0$2400 Uha Mk IV 080$3796Thennic Traveller 05 Dot 0$3100 Electric Playboy0501$2600 Hobby Hum Sensoar Glider 78 05 electric$1800 Astro Challenger 05 Geared$3250 Astro Vihing 05 Geared$3250 Antro POrtedield 15 25 Geared$5996 Autro Spptt 37 05 Direct$2996 Daveys Robin 05 Geared$3371 Daveys Lu Crate 108 Geared$3596 FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL SNIPPING & HANDLING76 Page CATALOGUE UptO $800 add $200$200 pp/lot Class free $801 $2000 add $250when requested order $2001 84500 add $325 $4501 $7000 add $375HOBBY HORN DEer $7008 add $450 CA Addressees add 6% tue Seed MorOn SI [A] MOVISAIMC#&EapsrCheck OBoc 2212 adore up to38 days tsr chedsWeulminater Ca 92684 clearance 893-8311 COD Esact charges phis $108I-Irs Mon-Fri 9AM 5PM huddling Cash Ordy Hazardous activities Readers frequently draw attention send Copies photographs de picting hazardous activities have appeared either newspapers modeling press Two such letters arrived last month first clipping Texas newspa per dont know sent mod eler shall remain anonymous added caption What wrong picture photo depicted RC Pattern-type model flight moment cut ribbon dedicate completion opening new concrete run way Texas club installed flying field Im assuming wrong act de picted photo ends ribbon being held two club members standing opposite sides new runway have no doubt model being piloted experienced modeler radio interference equip ment failure can occur best us Ive attended fun-flys past featured Limbo event ends limbo rib bon held club members Im convinced good practice want stage Limbo event perform ribbon-cutting model its better support ends ribbon poles keep people behind flight line second letter District IV AVP Char lie Spear drew attention photo ap peared Model Aviation showed win ning float parade featured model aircraft caption under picture stated An other Piper quarter-scale taxiing behind float Since taxiing model pic ture have no way knowing whether its pilot Continued page 22 Span85in Length66 Wing areal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdI $21500 plus shipping *1100 Evaryfiring ht swatch kft pbm piscut od puss moompaoemodel z DILIXI Kit $28500 plus slipping $1106 Evarytbing tuE kit bert wlq spain lastaled wIqa stab turtle dash batch & sbtrsed 1116 balsa MAKES htflUitIO GIJICKI AH wood Gloam construction ~gaas cowl pants 2pi plugin wings airtollod tail surfaces No lull hence wtres reqeired FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 HE Ave. Spirit Lake IA S13MI 20 Model Aviation time write define flutter gatlell TR260 leer Fund Aer&eIic Deaip 1/4 Stand-oIl Scala Kit sjut $10300 plus slipping $1100 Cast pasta campy bnq pm pleas turn uris hr vile tat sartacan tattle duck 5 baleb IKON NWST IKON NWST has largest selection giant scale kits ava abe today offer best value modeling dollar Design Building Integrity Scale Fidelity Scale Flight Characteristics stands d IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS Del-IAVILLAND BEAVER 96$17500TAYLORCRAFT90$15595 107 17600 PORTERFIELD COLLEGIATE 84 14595 64 18750 FAIRCHILD24RANGERI 90 21000 46 6295 PORTERFIELD FLY-ABOUT 80 13750 96 18750 WACO MODEL 10 734 19000 WACO TAPER WING 727 18000 fine kits include ormed landing gear cut parts rol horns cranks ws ls lete plans surfaces fully drawn s pants ity hand selected balsa ow acetate ct spruce ruction manual photos TO ORDER Callordropusaline ipwithin3days ling&Shippingis$75OPerKit IKON NWST ox 306 Dept MA Falls ID 83854 773-9001 MA 1009 loose tether safeguard event some reason engine should suddenly go full throttle want feature taxiing models parade strongly urge tethered some manner pilots Full-scale threat As mentioned earlier column spent Christmas visiting relatives England part visit town Malton about 25 miles east city York close North Yorkshire Moors moorland area populated mostly sheep vast undulating area devoid veg etation except heather also designated low-flying area Royal Air Force training activ ities say low mean LOW told supposed stay under 500 ft grew up area moors perfect place first attempts Free Flight Power Rubber models However Id reluctant fly now because Tomados A- lOs dominate skies give virtually no warning ground-hugging approach Which brings experience described recent letter Doug Inkley modeler now resides Arlington VA Doug fol lowing relate football season University Wyoming Saturday late October pro vided bit Indian summer weather com pelled mc novice RC Glider pilot try lit tle Soaring Laramie small town headed favorite Soaring area plateau just north town grasslands Laramie basin great place inexperienced Glider pilot such myself could land just about anywhere site grassy treeless Continued page 133 Box 1063 Lorain Ohio 44055 Phnn 21 6 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. $750 Light Indoor kits $795 OUTDOOR PEANUT Super Scale. NEW Micro X Hornet P30 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber CO Power Kits 8850 SPORT MODELS An Embryo Model 18 Span designed winl beginners ... $850 HARD-TO-FIND ITEMS Early Bird liesue Antique Aircraft *616 True OldeJapanese Tissue lOin 3 cobra*616 Jepansee Tissue 12 inS colors*916 Mkrolite Silver *316 Microfilm Glue Solvent Condenser Paper 3 sheets*460 Plan Ser1ce over 17 Scale Sport Scala ft Peanut Scale Rubber Strip 020 thru 066each *116 3132 thru 5/32each *260 WinderSi 6 MarkllB1 . *1216 Complete une Brown CO Motors Bales Wood Outdoor ft Indoor Sheets ft Stripe Add 10% Poetage mum Postage *160 COMPIETE CATALOG *110 22 Model Aviation 90 OTHER FINE KITS WE OFFER FAIRCHILD 24CORBEN SUPER ACE WARNER SCALE 80 1/5 SCALE 90 13995 $18475 Bill Eftlnger lie lee geet oboeS ecole RIC ho, GOld. Age bolt eoel obbet poweed ceo nodl etoond 1931 end Owe very beet ecele Ilyot ite ii. bOo deelgoed 1/6 ecelo 9/C verelot thot 00010 boildeto ehoold conoidet neol stoleot Light enoogh tot 020 2-cycle enoog enoogh lot 99 4-cycle 81 wingspan 904 sq wing area 51 overall length Fuselage plywood/balsa Wing built-up 1 piece cantilever Tail Surfaces built-up balsa Landing Gear shock-resistant wire PlanN Pattern #RC6S-1$1495 6 -68 length wing span 13- 23 engines 2268 sq wing area 3 4 channel RIC Plan N Pattern Set #RCQS-1 4$2495 Piper Cub J-31 119 wingspan 2800 sq wing area 90 th 19 lbs 4 channel 20- 30 2-cycle engine Plan N Pattern #RC3S-2$2996 bill rein9, ie bonding otowbot ol AMA AMA-AFFs 1401101 ewot Pricen Oto Coerplete Ploy soh-Ansnwbly end Detilod POtI Liete Add $299 Melilna Tebe Setd lot stoohorer eheod cowd Now bochoto 10wing new Plen set lot tUS Einirlo Power denig, bollotin ,ow itteloded broohore Seed *1 ndebl yoo tiot warn WE Technical Services PO Box 76684A Atlanta GA 30323 FROM IPAVEY YSTEMS ir really slick trainers little hassles building taken out box before open birds simple build pretty look small parts well sides tail feathers pre cut ready quick assembly Youll air flying own faster ever expected -4 BT-20 three channel trainer 15-25 engines Has fully sheeted flat bottom wing can built optional ailerons 50 span 400 sq area AT-50 four channel advanced trainer 19-30 engines scale look flies rock stable like pattern bird has wide speed range Has 50 span semi-symme trical airfoil 400 sq area Both kits feature rolled plans step-by- h step instructions hardware wheel pantsEIVEY675 TOWER LANE formed gear accurately die andYSTEMSWEST CHESTER PA 19380 machine cut selected woods EoRPORATIoN 215-430-8645 Safety/Preston Continued page 22 some seven miles removed local air port Out normal flightpaths What didnt know about football turned out important day Unknown UW playing Air Force Academy Fal cons brought football team cheerlead ers prairie falcon AND jet fighters low-level pass over stadium several fight ers scheduled halftime self would have problem loca tion slightly above stadium altitude just half-mile north directly flightpath aircraft about wow thousands spectators low-level pass would have fine sky fighters came low-level approach stadium Fortunately lower damn close Glider fighters simultaneously field vision jets looked big pass sudden low fast loud completely unnerved lost control Glider Fortunately companions brought senses landed safely However didnt go back up again thought another pass might made fighters wasnt Having just buzzed extremely lowflying aircraft RAF can identify Dougs momentary disorientation ended letter stating Always always alert care ful attentive cant too careful should always prepared unex pected echo message Have another safe month April 1989 133 GETTING AIRBORNE VOLUME ALL ABOUT BUILDING FLYING COVERING ENGINES AND MORE GETlNG AIRBORNE VOLUME ONE has over 400 large detailed photographs includes topics like selecting radio radio control works learning fly instructor learning Instructor learn basic maneuvers like landing Other chapters explain about ARFs field equipment operating engines assembling airplane easy learning control Installations much cat Number BOKOO9$1295 GETTING AIRBORNE VOLUME TWO includes topics like building strength appearance alignment New plastic film covering techniques developed experts beginner explain get nicad batteries rebuild servo engine airframe Additional installations topics shown much cat Number BOKOl 0$1295 HARRY 8 HIGLEY & SONS INC P o sox 532 GLENwOOD ILL 60425 GETTING AIRBORNE
Edition: Model Aviation - 1989/04
Page Numbers: 14, 16, 18, 20, 22, 133
John Preston Safety12 Comes Flint Nortbansmon Sc NW Washington DC 20015 column provided address Items concern regaidng safety aspects model aviation actMdes Content coIunn however opinion author does necessuily represent official position Academy Model Aeronantics Odorless Cya glue Mounting plates Zenoah G-38 engines flutter Hazardous activities Full-scale threat ODORLESS CyA GLUE Allergic reactions fumes emitted cyanoacrylate CyA glue cures have subject num ber previous Safety columns Modelers have developed sensitivity fumes have adopted various solutions problem have ranged use respirator uncomfortable increasing ventilation workshop very practical winter discon tinuing use products unacceptable Well seems Bob Bill Hunter Satel lite City Inc may have hit ultimate solu tion have previously suf fered discomforting allergic reactions Last week returned two-week Christmas vacation England found package delivered UPS contained sam ples two new products known User Friendly Odorless UFO instant glue thin pen etrating glue bottle red label other thick glue used gap filling packaged bottle green label Some may have already seen advertise ments two new glues able subject products al lergy test myself since Ive experienced res piratory problems previously marketed CyA glues However intend pass sam ples friend has experienced such prob lems past willing have him act guinea pig According information sheet accom panied glue samples UFO glues can used directly white foam dissolving Whether have previously suffered reaction CyA glue fumes seems instant glue will work direcfly foam real plus worth giving try under stand UFO glues currently being shipped dealers local hobby empori um doesnt yet stock might request owner put order Comments readers try products welcome Safety alert Periodically receive letters describe problems modeling products authors have experienced Having neither own testing lab nor budget tests con ducted contractor such letters present dilemma Should rely authenticity reports letters andwithout further verificationpass readers should purge reports brand names leave dark whether may have potentially hazardous product pos session copy letter sent Larry Maynard importer received magazine last month forwarded attention Larry added note letter stated safety information should made available users Zenoah G-38 engines letter de scribed potential problem associated mounting plate engine popular among Big Bird modelers Since Larry like professional engineer Im going accept description problem ouflined letter further investigation pass benefit other modelers may own engine Over Larry am very happy owner three Zenoah G 38 engines have mounted 1 Robinhood 99 2 Sig Morrissey Bravo 3 lowwing aircraft derived Bridis Big Bee three aircraft engine Robinhood has far time probably amounts about three four hours engines mounted 1A-in birch plywood box reinforced corners 34-in blocks through-bolted firewall Now other shoe stamped sheet metal mounting plate engine Robinhood has developed cracks must replaced safety reasons received warning owner hobby store Gardena CA caused make careful investiga tion mounting plates have discussed other G-38 owners have experi enced similar problems whenever steel mount ing plate used am professional engineer involved safety design requirements payloads flown Space Shuttle failure modes have experienced hydrogen embrit tlement plated steel parts under cyclic ie vibrational loads often result cracking similar seen mounting plates appropriate solution problem bake plated parts 3250 F no less 23 hours drive Out hydrogen remaining plat ing process purposes intend replace mounting plates %-in-thick 6061 alumi num plates see works out suggest readers may have model powered Zenoah G-38 installed stamped sheet metal mounting plate should take close look plate see sign cracks developing Thank Larry safety alert Continued page 16 14 Model Aviation DONT SEE A4I $1&IJ 0F YOUR GLfl2ER SINCE THE LOW PASS 8 ThAT JET FieI4TLA Flutter Although college education fi nanced aircraft manufacturer am chanical rather aeronautical engineer So aeronautical engineers write take issue something Safety column pertained discipline Im going argue Ill begin letter Charles Richard Lancaster CA Charles disagreed state ment appeared January 1989 column statement actually something dreamed up rather found letter received another mechanical engineer responding previous request formation predict whether particular design will prone flutter Anyway heres Charles opinion just could let comment made January 1989 issue Model Aviation stand out advising error concerning ex planation wing flutter first paragraph page 23 refer enced publication stated rule thumb used designers full-scale aircraft have center-of-gravity wing entire airplane between leading edge wing 25% chord Wrong wrong wrong wrong minimize onset torsional flutter subsequent modes including bending oscillations center-of-twist elastic axis centerof-gravity wing chord should kept ahead quarter-chord section lifting surface short flutter resistant lifting surface should tend twist about axis lies ahead airfoil section quarter-chord subjected bending Also maintain proper location elastic axis important preserve conti Continued page 18 16 Model Aviation Wingspan 45-in 20 40 engnes 3-channel control Introducing Son Mr Rugged Inc Orchard Grove Drive V-----Royal Oak MI 48067 second generation durable model airplane market has arrived new high-lift wing rugged construction before simplified assembly make DuraPlane lithe easiest forgiving way world become model airplane pilot Since original DuraPlane came market two years ago weve listening what customers have say suggestions own research weve refined original design invite try unique model trainer available new DuraPlane Ilwatch skies BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited VFI ND GIANTS FOR GIANT SCALE BUFFS N F 00 7OBa e 12 T60 H era 4 3CHa$8 94CH 74 Doolitrlne 08 11 $48 72 Car02U1 /4 L&5 $46 95 Maroaacpo Sport $36i 108 Car 0201/4 LOS $56 80 Hell Spr Scildag 543 60 Dooglee /4-2 Mail $24 107 Aeronro C3 SF 535- 60 Oceral Balidag Frr 30 62 Hoerard Rena ho $65 59 BrernEece MeLA 854 78 Tamer WW Rac S35107 Orooc Beard F8F $54 63 Car Oaelrh Fl iC $4269 Lindhege NX-21 1 $28 84 Car Caelrlc FlIC $5491 tirrdberge NO-SI 1 $39 66 DeHan Caere Rec $2496 WrNW-lNao Raa $48 —s62 HoecMrMaIIigan $3574 C Helidor SB2C4 855 94 HoocMrMolligan $45 108 PairclrPT19 yr $59 eeirrg F-26A Pr $36 60 Waco Taper-wing $36 84 Baeirg F-26A Pt $48PT Waco Taper-Wing $48i 69 Waco C-6 Cabin $36 75 WeelId Lycarder $32 78 Slog $38 106 Weetld Lyearder 549 6089" 2Fard Triratr 4AT $36 55 Loch 11 Electra $30 76 Fard Trier 4 AT $48 0 83 Loch Electra $40 114 Ford Trier 4 AT $63 62 Stineoc 11W 5B7 $18 96 BeIlonce Aircrai $48 tinean T/W 0B7 826 93 L 122 Otinean T/W 087 $38- 580 59 Brietol F, p2-B $30 780 118 Brintol Pt F2-B 845- 124 74 Tarcer Fence $45 62 56 Car WarInc F-40 $34 83 60 Vagr Cereal F46 $35 77W 80 Va8 Caeair P46 $69 63 C Seahoerk P7C1 $45 Loch Liglrtng P38 $38 94 C Seahoeric F7C1 057 " 56 BnpSeeBee Aer $24 108 Sihar 038 AerpI $49 epSaaBae Aer $39 60 Boeing 100 Spar $36 70 Fipor J3 Cab $29 90 Boeing 100 Sport $49106 Piper J-3 Cob $3P72NarrIrropGeerera $48 i.--j 98 Lack Hadnon Berh $38 96 Northrop Goerero $75 63 Gram F6F Hellcat $28 90 StinA looc 31M $06 77 Banino B17G Farc$35 60 StintA Lana 3fM $42 103 Ban 8170 Fart $55 1205 nsA Leer 3 MOB 68 Weed Whirlermnd $32 78 Cancel Cat FBY5A 042 68 N Aeror Naniac $39 104 Cao Co PET SA $56 Booacea VTail $39 65/4 Cl no CI eper $65 77 [aecanlce Sedan $35 97 /4 Ch no Cl oper $70 NA 820 Bomber $49 62 Cat cc NC 4 6$ toMarooder 826 549 94 Ca NC 4 W c Ste oceracees Beanean elan aloe c*re H Sold rhro Onolere Price cab ect change nec 1400 SOc OF- 6124 Pane Aleroyc led Add 10% order cImiFF ng & ne etc USA Con & Mao Blceerhera ice 10% 125% air* Fietarial catalog $200 lincladec PrIce Lictl Frice icc aceiae aloe $100 aIr foreIgn add $100 LEVELANDMODEL&SUPPLY Co 183878 BETtOfT API CLEVELAND OHIO 44182 oeceeereceaara bee 515 PM0 ST ICr LSSTI{2161 9613600 acOccacececc After glance youve probably already guessed CGX 500 built deliver kind season-after-season reliability can make last power panel youll ever have buy So ask yourself does really make sense settle anything less CARL GOLDBERG could own CCX 500 few dollars MODELS INC have correctly grasped what Charles has said letter solution minimizing inflight failure sheet balsa stabilizer what started discussion flutter may equip stiff hardwood leading edge should move elastic axis point front quarter-chord point Right second letter came Joel Chesler senior flutter analyst Northrop Cor poration prime interest hobby competition Free Flight Joel also took exception statement January 1989 column stated Flutter aviation world torsional vibration wing Joels definition Flutter in-flight instability usually caused coupling two forms vibration may may torsional other typically bending control surface rota tion velocity dependent will occur until critical velocity reached Additionally control surface flutter can caused same mechanisms just described depending relative stiffness associ ated pushrodand inertial characteristics control surface thank both Charles Joel taking Continued page 20 nuity torsional resistant structure through Carry time Largest Only Stock 1 out its span closed tube sufficiently strong 2 All-Balsa Kraft Parts World aft resist hending located ahead quarterchord lifting surface section would ensureARFs ZMP alive working flutter resistance may noted such tube KRAFT can made enclosing upper lower sur face structural sheeting between front spar leading edge form D-shaped closed MIDWEST cell torque box throughout span ILLbLIA Authonzed Warranty ServiceFREQUENCY CONVERSION $1000 Discount Regular Repair Moat Makes Modela Converted Tuning Donewith Spectrum Analyzer ____K- LINE Also Service ME rn/C FutabmtyShad Only Full Time Servicenter Ihe Midwesi ll7East Main St Northvil le Michigan 48167 er 1-313-348-0085 SUkHOI Su-26M th span 68 area 810 sq Ins meter 4strohe 120 cquiv Preass*sled fuselage sheeted plug-in wings sheeted stabtin & ruddef e die epoxy cowl texan canopy & illustrated aaehly menual 18 Model Aviation MONARCH AW Sport Pattern span 66 area 7SOsqins meter 4 stroke 80 G0cujn PreaaamrAled fuselage veneered wing ehaped bales parts texan canopy epoxy cowl Illustratd assly Eanusl c ZIMPRO MARKETING ' posoassssoasnuosneam P40 sIsss-arn Kits P& W Model Service 1935 Miss America 84$71961936 Buccaneer 84$5996 1937 Dallaire 108$75161938 Clipper Mk 172$4156 1938 KIoud King 63$42361939 Powerhouse 84$5356 1939 Record Breaker 96$69561938 Trenton Terror 72$4076 1939 Korda Wake 44$19161939 Mercaty 72$5936 1939 Zipper 54$53561940 Ranger 46$3196 1940 Sailplane 78$94761940 50 Long 50$3036 1941 Brigidier 56$40761941 Super Quaker 78$7276 1941 Playboy Jr 54$31161941 Playboy Sr 80$5116 1941 BroOklyn Dodger 56$4236 Midway Model Co Full Kits 1936 Flying Quaker 84$64761938 Powerhouse 50$2996 1937 Long Cabin 79$47161939 AT Spertoer 50$2956 1937 Quaker Flash 67$45561940 Buzzard Bombshell 1937 Air Chief 61$3596 2spankd$8696 I94ONowRuler74$7116 0spankd$3596 above kits qualify Sass events PP & R/C feature rho highest quality machine cut & sanded parts sheet & strip wood wire & window material Most plans original PP rho models easily convertible 3ch R/C Sailpianes Electric Power Gas Kits MIDWAY MODEL COELECTRIC MODEL DESIGN Gnome HLG 60$2400Sky Knight 44 05 Dl$2400 Gtmme2M Older79$3796EledraGFde II 73 05D$3100 Pant Eddie 050$2400Lightning 36 05 0$2400 Uha Mk IV 080$3796Thennic Traveller 05 Dot 0$3100 Electric Playboy0501$2600 Hobby Hum Sensoar Glider 78 05 electric$1800 Astro Challenger 05 Geared$3250 Astro Vihing 05 Geared$3250 Antro POrtedield 15 25 Geared$5996 Autro Spptt 37 05 Direct$2996 Daveys Robin 05 Geared$3371 Daveys Lu Crate 108 Geared$3596 FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL SNIPPING & HANDLING76 Page CATALOGUE UptO $800 add $200$200 pp/lot Class free $801 $2000 add $250when requested order $2001 84500 add $325 $4501 $7000 add $375HOBBY HORN DEer $7008 add $450 CA Addressees add 6% tue Seed MorOn SI [A] MOVISAIMC#&EapsrCheck OBoc 2212 adore up to38 days tsr chedsWeulminater Ca 92684 clearance 893-8311 COD Esact charges phis $108I-Irs Mon-Fri 9AM 5PM huddling Cash Ordy Hazardous activities Readers frequently draw attention send Copies photographs de picting hazardous activities have appeared either newspapers modeling press Two such letters arrived last month first clipping Texas newspa per dont know sent mod eler shall remain anonymous added caption What wrong picture photo depicted RC Pattern-type model flight moment cut ribbon dedicate completion opening new concrete run way Texas club installed flying field Im assuming wrong act de picted photo ends ribbon being held two club members standing opposite sides new runway have no doubt model being piloted experienced modeler radio interference equip ment failure can occur best us Ive attended fun-flys past featured Limbo event ends limbo rib bon held club members Im convinced good practice want stage Limbo event perform ribbon-cutting model its better support ends ribbon poles keep people behind flight line second letter District IV AVP Char lie Spear drew attention photo ap peared Model Aviation showed win ning float parade featured model aircraft caption under picture stated An other Piper quarter-scale taxiing behind float Since taxiing model pic ture have no way knowing whether its pilot Continued page 22 Span85in Length66 Wing areal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdI $21500 plus shipping *1100 Evaryfiring ht swatch kft pbm piscut od puss moompaoemodel z DILIXI Kit $28500 plus slipping $1106 Evarytbing tuE kit bert wlq spain lastaled wIqa stab turtle dash batch & sbtrsed 1116 balsa MAKES htflUitIO GIJICKI AH wood Gloam construction ~gaas cowl pants 2pi plugin wings airtollod tail surfaces No lull hence wtres reqeired FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 HE Ave. Spirit Lake IA S13MI 20 Model Aviation time write define flutter gatlell TR260 leer Fund Aer&eIic Deaip 1/4 Stand-oIl Scala Kit sjut $10300 plus slipping $1100 Cast pasta campy bnq pm pleas turn uris hr vile tat sartacan tattle duck 5 baleb IKON NWST IKON NWST has largest selection giant scale kits ava abe today offer best value modeling dollar Design Building Integrity Scale Fidelity Scale Flight Characteristics stands d IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS Del-IAVILLAND BEAVER 96$17500TAYLORCRAFT90$15595 107 17600 PORTERFIELD COLLEGIATE 84 14595 64 18750 FAIRCHILD24RANGERI 90 21000 46 6295 PORTERFIELD FLY-ABOUT 80 13750 96 18750 WACO MODEL 10 734 19000 WACO TAPER WING 727 18000 fine kits include ormed landing gear cut parts rol horns cranks ws ls lete plans surfaces fully drawn s pants ity hand selected balsa ow acetate ct spruce ruction manual photos TO ORDER Callordropusaline ipwithin3days ling&Shippingis$75OPerKit IKON NWST ox 306 Dept MA Falls ID 83854 773-9001 MA 1009 loose tether safeguard event some reason engine should suddenly go full throttle want feature taxiing models parade strongly urge tethered some manner pilots Full-scale threat As mentioned earlier column spent Christmas visiting relatives England part visit town Malton about 25 miles east city York close North Yorkshire Moors moorland area populated mostly sheep vast undulating area devoid veg etation except heather also designated low-flying area Royal Air Force training activ ities say low mean LOW told supposed stay under 500 ft grew up area moors perfect place first attempts Free Flight Power Rubber models However Id reluctant fly now because Tomados A- lOs dominate skies give virtually no warning ground-hugging approach Which brings experience described recent letter Doug Inkley modeler now resides Arlington VA Doug fol lowing relate football season University Wyoming Saturday late October pro vided bit Indian summer weather com pelled mc novice RC Glider pilot try lit tle Soaring Laramie small town headed favorite Soaring area plateau just north town grasslands Laramie basin great place inexperienced Glider pilot such myself could land just about anywhere site grassy treeless Continued page 133 Box 1063 Lorain Ohio 44055 Phnn 21 6 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. $750 Light Indoor kits $795 OUTDOOR PEANUT Super Scale. NEW Micro X Hornet P30 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber CO Power Kits 8850 SPORT MODELS An Embryo Model 18 Span designed winl beginners ... $850 HARD-TO-FIND ITEMS Early Bird liesue Antique Aircraft *616 True OldeJapanese Tissue lOin 3 cobra*616 Jepansee Tissue 12 inS colors*916 Mkrolite Silver *316 Microfilm Glue Solvent Condenser Paper 3 sheets*460 Plan Ser1ce over 17 Scale Sport Scala ft Peanut Scale Rubber Strip 020 thru 066each *116 3132 thru 5/32each *260 WinderSi 6 MarkllB1 . *1216 Complete une Brown CO Motors Bales Wood Outdoor ft Indoor Sheets ft Stripe Add 10% Poetage mum Postage *160 COMPIETE CATALOG *110 22 Model Aviation 90 OTHER FINE KITS WE OFFER FAIRCHILD 24CORBEN SUPER ACE WARNER SCALE 80 1/5 SCALE 90 13995 $18475 Bill Eftlnger lie lee geet oboeS ecole RIC ho, GOld. Age bolt eoel obbet poweed ceo nodl etoond 1931 end Owe very beet ecele Ilyot ite ii. bOo deelgoed 1/6 ecelo 9/C verelot thot 00010 boildeto ehoold conoidet neol stoleot Light enoogh tot 020 2-cycle enoog enoogh lot 99 4-cycle 81 wingspan 904 sq wing area 51 overall length Fuselage plywood/balsa Wing built-up 1 piece cantilever Tail Surfaces built-up balsa Landing Gear shock-resistant wire PlanN Pattern #RC6S-1$1495 6 -68 length wing span 13- 23 engines 2268 sq wing area 3 4 channel RIC Plan N Pattern Set #RCQS-1 4$2495 Piper Cub J-31 119 wingspan 2800 sq wing area 90 th 19 lbs 4 channel 20- 30 2-cycle engine Plan N Pattern #RC3S-2$2996 bill rein9, ie bonding otowbot ol AMA AMA-AFFs 1401101 ewot Pricen Oto Coerplete Ploy soh-Ansnwbly end Detilod POtI Liete Add $299 Melilna Tebe Setd lot stoohorer eheod cowd Now bochoto 10wing new Plen set lot tUS Einirlo Power denig, bollotin ,ow itteloded broohore Seed *1 ndebl yoo tiot warn WE Technical Services PO Box 76684A Atlanta GA 30323 FROM IPAVEY YSTEMS ir really slick trainers little hassles building taken out box before open birds simple build pretty look small parts well sides tail feathers pre cut ready quick assembly Youll air flying own faster ever expected -4 BT-20 three channel trainer 15-25 engines Has fully sheeted flat bottom wing can built optional ailerons 50 span 400 sq area AT-50 four channel advanced trainer 19-30 engines scale look flies rock stable like pattern bird has wide speed range Has 50 span semi-symme trical airfoil 400 sq area Both kits feature rolled plans step-by- h step instructions hardware wheel pantsEIVEY675 TOWER LANE formed gear accurately die andYSTEMSWEST CHESTER PA 19380 machine cut selected woods EoRPORATIoN 215-430-8645 Safety/Preston Continued page 22 some seven miles removed local air port Out normal flightpaths What didnt know about football turned out important day Unknown UW playing Air Force Academy Fal cons brought football team cheerlead ers prairie falcon AND jet fighters low-level pass over stadium several fight ers scheduled halftime self would have problem loca tion slightly above stadium altitude just half-mile north directly flightpath aircraft about wow thousands spectators low-level pass would have fine sky fighters came low-level approach stadium Fortunately lower damn close Glider fighters simultaneously field vision jets looked big pass sudden low fast loud completely unnerved lost control Glider Fortunately companions brought senses landed safely However didnt go back up again thought another pass might made fighters wasnt Having just buzzed extremely lowflying aircraft RAF can identify Dougs momentary disorientation ended letter stating Always always alert care ful attentive cant too careful should always prepared unex pected echo message Have another safe month April 1989 133 GETTING AIRBORNE VOLUME ALL ABOUT BUILDING FLYING COVERING ENGINES AND MORE GETlNG AIRBORNE VOLUME ONE has over 400 large detailed photographs includes topics like selecting radio radio control works learning fly instructor learning Instructor learn basic maneuvers like landing Other chapters explain about ARFs field equipment operating engines assembling airplane easy learning control Installations much cat Number BOKOO9$1295 GETTING AIRBORNE VOLUME TWO includes topics like building strength appearance alignment New plastic film covering techniques developed experts beginner explain get nicad batteries rebuild servo engine airframe Additional installations topics shown much cat Number BOKOl 0$1295 HARRY 8 HIGLEY & SONS INC P o sox 532 GLENwOOD ILL 60425 GETTING AIRBORNE
Edition: Model Aviation - 1989/04
Page Numbers: 14, 16, 18, 20, 22, 133
John Preston Safety12 Comes Flint Nortbansmon Sc NW Washington DC 20015 column provided address Items concern regaidng safety aspects model aviation actMdes Content coIunn however opinion author does necessuily represent official position Academy Model Aeronantics Odorless Cya glue Mounting plates Zenoah G-38 engines flutter Hazardous activities Full-scale threat ODORLESS CyA GLUE Allergic reactions fumes emitted cyanoacrylate CyA glue cures have subject num ber previous Safety columns Modelers have developed sensitivity fumes have adopted various solutions problem have ranged use respirator uncomfortable increasing ventilation workshop very practical winter discon tinuing use products unacceptable Well seems Bob Bill Hunter Satel lite City Inc may have hit ultimate solu tion have previously suf fered discomforting allergic reactions Last week returned two-week Christmas vacation England found package delivered UPS contained sam ples two new products known User Friendly Odorless UFO instant glue thin pen etrating glue bottle red label other thick glue used gap filling packaged bottle green label Some may have already seen advertise ments two new glues able subject products al lergy test myself since Ive experienced res piratory problems previously marketed CyA glues However intend pass sam ples friend has experienced such prob lems past willing have him act guinea pig According information sheet accom panied glue samples UFO glues can used directly white foam dissolving Whether have previously suffered reaction CyA glue fumes seems instant glue will work direcfly foam real plus worth giving try under stand UFO glues currently being shipped dealers local hobby empori um doesnt yet stock might request owner put order Comments readers try products welcome Safety alert Periodically receive letters describe problems modeling products authors have experienced Having neither own testing lab nor budget tests con ducted contractor such letters present dilemma Should rely authenticity reports letters andwithout further verificationpass readers should purge reports brand names leave dark whether may have potentially hazardous product pos session copy letter sent Larry Maynard importer received magazine last month forwarded attention Larry added note letter stated safety information should made available users Zenoah G-38 engines letter de scribed potential problem associated mounting plate engine popular among Big Bird modelers Since Larry like professional engineer Im going accept description problem ouflined letter further investigation pass benefit other modelers may own engine Over Larry am very happy owner three Zenoah G 38 engines have mounted 1 Robinhood 99 2 Sig Morrissey Bravo 3 lowwing aircraft derived Bridis Big Bee three aircraft engine Robinhood has far time probably amounts about three four hours engines mounted 1A-in birch plywood box reinforced corners 34-in blocks through-bolted firewall Now other shoe stamped sheet metal mounting plate engine Robinhood has developed cracks must replaced safety reasons received warning owner hobby store Gardena CA caused make careful investiga tion mounting plates have discussed other G-38 owners have experi enced similar problems whenever steel mount ing plate used am professional engineer involved safety design requirements payloads flown Space Shuttle failure modes have experienced hydrogen embrit tlement plated steel parts under cyclic ie vibrational loads often result cracking similar seen mounting plates appropriate solution problem bake plated parts 3250 F no less 23 hours drive Out hydrogen remaining plat ing process purposes intend replace mounting plates %-in-thick 6061 alumi num plates see works out suggest readers may have model powered Zenoah G-38 installed stamped sheet metal mounting plate should take close look plate see sign cracks developing Thank Larry safety alert Continued page 16 14 Model Aviation DONT SEE A4I $1&IJ 0F YOUR GLfl2ER SINCE THE LOW PASS 8 ThAT JET FieI4TLA Flutter Although college education fi nanced aircraft manufacturer am chanical rather aeronautical engineer So aeronautical engineers write take issue something Safety column pertained discipline Im going argue Ill begin letter Charles Richard Lancaster CA Charles disagreed state ment appeared January 1989 column statement actually something dreamed up rather found letter received another mechanical engineer responding previous request formation predict whether particular design will prone flutter Anyway heres Charles opinion just could let comment made January 1989 issue Model Aviation stand out advising error concerning ex planation wing flutter first paragraph page 23 refer enced publication stated rule thumb used designers full-scale aircraft have center-of-gravity wing entire airplane between leading edge wing 25% chord Wrong wrong wrong wrong minimize onset torsional flutter subsequent modes including bending oscillations center-of-twist elastic axis centerof-gravity wing chord should kept ahead quarter-chord section lifting surface short flutter resistant lifting surface should tend twist about axis lies ahead airfoil section quarter-chord subjected bending Also maintain proper location elastic axis important preserve conti Continued page 18 16 Model Aviation Wingspan 45-in 20 40 engnes 3-channel control Introducing Son Mr Rugged Inc Orchard Grove Drive V-----Royal Oak MI 48067 second generation durable model airplane market has arrived new high-lift wing rugged construction before simplified assembly make DuraPlane lithe easiest forgiving way world become model airplane pilot Since original DuraPlane came market two years ago weve listening what customers have say suggestions own research weve refined original design invite try unique model trainer available new DuraPlane Ilwatch skies BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited VFI ND GIANTS FOR GIANT SCALE BUFFS N F 00 7OBa e 12 T60 H era 4 3CHa$8 94CH 74 Doolitrlne 08 11 $48 72 Car02U1 /4 L&5 $46 95 Maroaacpo Sport $36i 108 Car 0201/4 LOS $56 80 Hell Spr Scildag 543 60 Dooglee /4-2 Mail $24 107 Aeronro C3 SF 535- 60 Oceral Balidag Frr 30 62 Hoerard Rena ho $65 59 BrernEece MeLA 854 78 Tamer WW Rac S35107 Orooc Beard F8F $54 63 Car Oaelrh Fl iC $4269 Lindhege NX-21 1 $28 84 Car Caelrlc FlIC $5491 tirrdberge NO-SI 1 $39 66 DeHan Caere Rec $2496 WrNW-lNao Raa $48 —s62 HoecMrMaIIigan $3574 C Helidor SB2C4 855 94 HoocMrMolligan $45 108 PairclrPT19 yr $59 eeirrg F-26A Pr $36 60 Waco Taper-wing $36 84 Baeirg F-26A Pt $48PT Waco Taper-Wing $48i 69 Waco C-6 Cabin $36 75 WeelId Lycarder $32 78 Slog $38 106 Weetld Lyearder 549 6089" 2Fard Triratr 4AT $36 55 Loch 11 Electra $30 76 Fard Trier 4 AT $48 0 83 Loch Electra $40 114 Ford Trier 4 AT $63 62 Stineoc 11W 5B7 $18 96 BeIlonce Aircrai $48 tinean T/W 0B7 826 93 L 122 Otinean T/W 087 $38- 580 59 Brietol F, p2-B $30 780 118 Brintol Pt F2-B 845- 124 74 Tarcer Fence $45 62 56 Car WarInc F-40 $34 83 60 Vagr Cereal F46 $35 77W 80 Va8 Caeair P46 $69 63 C Seahoerk P7C1 $45 Loch Liglrtng P38 $38 94 C Seahoeric F7C1 057 " 56 BnpSeeBee Aer $24 108 Sihar 038 AerpI $49 epSaaBae Aer $39 60 Boeing 100 Spar $36 70 Fipor J3 Cab $29 90 Boeing 100 Sport $49106 Piper J-3 Cob $3P72NarrIrropGeerera $48 i.--j 98 Lack Hadnon Berh $38 96 Northrop Goerero $75 63 Gram F6F Hellcat $28 90 StinA looc 31M $06 77 Banino B17G Farc$35 60 StintA Lana 3fM $42 103 Ban 8170 Fart $55 1205 nsA Leer 3 MOB 68 Weed Whirlermnd $32 78 Cancel Cat FBY5A 042 68 N Aeror Naniac $39 104 Cao Co PET SA $56 Booacea VTail $39 65/4 Cl no CI eper $65 77 [aecanlce Sedan $35 97 /4 Ch no Cl oper $70 NA 820 Bomber $49 62 Cat cc NC 4 6$ toMarooder 826 549 94 Ca NC 4 W c Ste oceracees Beanean elan aloe c*re H Sold rhro Onolere Price cab ect change nec 1400 SOc OF- 6124 Pane Aleroyc led Add 10% order cImiFF ng & ne etc USA Con & Mao Blceerhera ice 10% 125% air* Fietarial catalog $200 lincladec PrIce Lictl Frice icc aceiae aloe $100 aIr foreIgn add $100 LEVELANDMODEL&SUPPLY Co 183878 BETtOfT API CLEVELAND OHIO 44182 oeceeereceaara bee 515 PM0 ST ICr LSSTI{2161 9613600 acOccacececc After glance youve probably already guessed CGX 500 built deliver kind season-after-season reliability can make last power panel youll ever have buy So ask yourself does really make sense settle anything less CARL GOLDBERG could own CCX 500 few dollars MODELS INC have correctly grasped what Charles has said letter solution minimizing inflight failure sheet balsa stabilizer what started discussion flutter may equip stiff hardwood leading edge should move elastic axis point front quarter-chord point Right second letter came Joel Chesler senior flutter analyst Northrop Cor poration prime interest hobby competition Free Flight Joel also took exception statement January 1989 column stated Flutter aviation world torsional vibration wing Joels definition Flutter in-flight instability usually caused coupling two forms vibration may may torsional other typically bending control surface rota tion velocity dependent will occur until critical velocity reached Additionally control surface flutter can caused same mechanisms just described depending relative stiffness associ ated pushrodand inertial characteristics control surface thank both Charles Joel taking Continued page 20 nuity torsional resistant structure through Carry time Largest Only Stock 1 out its span closed tube sufficiently strong 2 All-Balsa Kraft Parts World aft resist hending located ahead quarterchord lifting surface section would ensureARFs ZMP alive working flutter resistance may noted such tube KRAFT can made enclosing upper lower sur face structural sheeting between front spar leading edge form D-shaped closed MIDWEST cell torque box throughout span ILLbLIA Authonzed Warranty ServiceFREQUENCY CONVERSION $1000 Discount Regular Repair Moat Makes Modela Converted Tuning Donewith Spectrum Analyzer ____K- LINE Also Service ME rn/C FutabmtyShad Only Full Time Servicenter Ihe Midwesi ll7East Main St Northvil le Michigan 48167 er 1-313-348-0085 SUkHOI Su-26M th span 68 area 810 sq Ins meter 4strohe 120 cquiv Preass*sled fuselage sheeted plug-in wings sheeted stabtin & ruddef e die epoxy cowl texan canopy & illustrated aaehly menual 18 Model Aviation MONARCH AW Sport Pattern span 66 area 7SOsqins meter 4 stroke 80 G0cujn PreaaamrAled fuselage veneered wing ehaped bales parts texan canopy epoxy cowl Illustratd assly Eanusl c ZIMPRO MARKETING ' posoassssoasnuosneam P40 sIsss-arn Kits P& W Model Service 1935 Miss America 84$71961936 Buccaneer 84$5996 1937 Dallaire 108$75161938 Clipper Mk 172$4156 1938 KIoud King 63$42361939 Powerhouse 84$5356 1939 Record Breaker 96$69561938 Trenton Terror 72$4076 1939 Korda Wake 44$19161939 Mercaty 72$5936 1939 Zipper 54$53561940 Ranger 46$3196 1940 Sailplane 78$94761940 50 Long 50$3036 1941 Brigidier 56$40761941 Super Quaker 78$7276 1941 Playboy Jr 54$31161941 Playboy Sr 80$5116 1941 BroOklyn Dodger 56$4236 Midway Model Co Full Kits 1936 Flying Quaker 84$64761938 Powerhouse 50$2996 1937 Long Cabin 79$47161939 AT Spertoer 50$2956 1937 Quaker Flash 67$45561940 Buzzard Bombshell 1937 Air Chief 61$3596 2spankd$8696 I94ONowRuler74$7116 0spankd$3596 above kits qualify Sass events PP & R/C feature rho highest quality machine cut & sanded parts sheet & strip wood wire & window material Most plans original PP rho models easily convertible 3ch R/C Sailpianes Electric Power Gas Kits MIDWAY MODEL COELECTRIC MODEL DESIGN Gnome HLG 60$2400Sky Knight 44 05 Dl$2400 Gtmme2M Older79$3796EledraGFde II 73 05D$3100 Pant Eddie 050$2400Lightning 36 05 0$2400 Uha Mk IV 080$3796Thennic Traveller 05 Dot 0$3100 Electric Playboy0501$2600 Hobby Hum Sensoar Glider 78 05 electric$1800 Astro Challenger 05 Geared$3250 Astro Vihing 05 Geared$3250 Antro POrtedield 15 25 Geared$5996 Autro Spptt 37 05 Direct$2996 Daveys Robin 05 Geared$3371 Daveys Lu Crate 108 Geared$3596 FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL SNIPPING & HANDLING76 Page CATALOGUE UptO $800 add $200$200 pp/lot Class free $801 $2000 add $250when requested order $2001 84500 add $325 $4501 $7000 add $375HOBBY HORN DEer $7008 add $450 CA Addressees add 6% tue Seed MorOn SI [A] MOVISAIMC#&EapsrCheck OBoc 2212 adore up to38 days tsr chedsWeulminater Ca 92684 clearance 893-8311 COD Esact charges phis $108I-Irs Mon-Fri 9AM 5PM huddling Cash Ordy Hazardous activities Readers frequently draw attention send Copies photographs de picting hazardous activities have appeared either newspapers modeling press Two such letters arrived last month first clipping Texas newspa per dont know sent mod eler shall remain anonymous added caption What wrong picture photo depicted RC Pattern-type model flight moment cut ribbon dedicate completion opening new concrete run way Texas club installed flying field Im assuming wrong act de picted photo ends ribbon being held two club members standing opposite sides new runway have no doubt model being piloted experienced modeler radio interference equip ment failure can occur best us Ive attended fun-flys past featured Limbo event ends limbo rib bon held club members Im convinced good practice want stage Limbo event perform ribbon-cutting model its better support ends ribbon poles keep people behind flight line second letter District IV AVP Char lie Spear drew attention photo ap peared Model Aviation showed win ning float parade featured model aircraft caption under picture stated An other Piper quarter-scale taxiing behind float Since taxiing model pic ture have no way knowing whether its pilot Continued page 22 Span85in Length66 Wing areal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdI $21500 plus shipping *1100 Evaryfiring ht swatch kft pbm piscut od puss moompaoemodel z DILIXI Kit $28500 plus slipping $1106 Evarytbing tuE kit bert wlq spain lastaled wIqa stab turtle dash batch & sbtrsed 1116 balsa MAKES htflUitIO GIJICKI AH wood Gloam construction ~gaas cowl pants 2pi plugin wings airtollod tail surfaces No lull hence wtres reqeired FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 HE Ave. Spirit Lake IA S13MI 20 Model Aviation time write define flutter gatlell TR260 leer Fund Aer&eIic Deaip 1/4 Stand-oIl Scala Kit sjut $10300 plus slipping $1100 Cast pasta campy bnq pm pleas turn uris hr vile tat sartacan tattle duck 5 baleb IKON NWST IKON NWST has largest selection giant scale kits ava abe today offer best value modeling dollar Design Building Integrity Scale Fidelity Scale Flight Characteristics stands d IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS Del-IAVILLAND BEAVER 96$17500TAYLORCRAFT90$15595 107 17600 PORTERFIELD COLLEGIATE 84 14595 64 18750 FAIRCHILD24RANGERI 90 21000 46 6295 PORTERFIELD FLY-ABOUT 80 13750 96 18750 WACO MODEL 10 734 19000 WACO TAPER WING 727 18000 fine kits include ormed landing gear cut parts rol horns cranks ws ls lete plans surfaces fully drawn s pants ity hand selected balsa ow acetate ct spruce ruction manual photos TO ORDER Callordropusaline ipwithin3days ling&Shippingis$75OPerKit IKON NWST ox 306 Dept MA Falls ID 83854 773-9001 MA 1009 loose tether safeguard event some reason engine should suddenly go full throttle want feature taxiing models parade strongly urge tethered some manner pilots Full-scale threat As mentioned earlier column spent Christmas visiting relatives England part visit town Malton about 25 miles east city York close North Yorkshire Moors moorland area populated mostly sheep vast undulating area devoid veg etation except heather also designated low-flying area Royal Air Force training activ ities say low mean LOW told supposed stay under 500 ft grew up area moors perfect place first attempts Free Flight Power Rubber models However Id reluctant fly now because Tomados A- lOs dominate skies give virtually no warning ground-hugging approach Which brings experience described recent letter Doug Inkley modeler now resides Arlington VA Doug fol lowing relate football season University Wyoming Saturday late October pro vided bit Indian summer weather com pelled mc novice RC Glider pilot try lit tle Soaring Laramie small town headed favorite Soaring area plateau just north town grasslands Laramie basin great place inexperienced Glider pilot such myself could land just about anywhere site grassy treeless Continued page 133 Box 1063 Lorain Ohio 44055 Phnn 21 6 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. $750 Light Indoor kits $795 OUTDOOR PEANUT Super Scale. NEW Micro X Hornet P30 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber CO Power Kits 8850 SPORT MODELS An Embryo Model 18 Span designed winl beginners ... $850 HARD-TO-FIND ITEMS Early Bird liesue Antique Aircraft *616 True OldeJapanese Tissue lOin 3 cobra*616 Jepansee Tissue 12 inS colors*916 Mkrolite Silver *316 Microfilm Glue Solvent Condenser Paper 3 sheets*460 Plan Ser1ce over 17 Scale Sport Scala ft Peanut Scale Rubber Strip 020 thru 066each *116 3132 thru 5/32each *260 WinderSi 6 MarkllB1 . *1216 Complete une Brown CO Motors Bales Wood Outdoor ft Indoor Sheets ft Stripe Add 10% Poetage mum Postage *160 COMPIETE CATALOG *110 22 Model Aviation 90 OTHER FINE KITS WE OFFER FAIRCHILD 24CORBEN SUPER ACE WARNER SCALE 80 1/5 SCALE 90 13995 $18475 Bill Eftlnger lie lee geet oboeS ecole RIC ho, GOld. Age bolt eoel obbet poweed ceo nodl etoond 1931 end Owe very beet ecele Ilyot ite ii. bOo deelgoed 1/6 ecelo 9/C verelot thot 00010 boildeto ehoold conoidet neol stoleot Light enoogh tot 020 2-cycle enoog enoogh lot 99 4-cycle 81 wingspan 904 sq wing area 51 overall length Fuselage plywood/balsa Wing built-up 1 piece cantilever Tail Surfaces built-up balsa Landing Gear shock-resistant wire PlanN Pattern #RC6S-1$1495 6 -68 length wing span 13- 23 engines 2268 sq wing area 3 4 channel RIC Plan N Pattern Set #RCQS-1 4$2495 Piper Cub J-31 119 wingspan 2800 sq wing area 90 th 19 lbs 4 channel 20- 30 2-cycle engine Plan N Pattern #RC3S-2$2996 bill rein9, ie bonding otowbot ol AMA AMA-AFFs 1401101 ewot Pricen Oto Coerplete Ploy soh-Ansnwbly end Detilod POtI Liete Add $299 Melilna Tebe Setd lot stoohorer eheod cowd Now bochoto 10wing new Plen set lot tUS Einirlo Power denig, bollotin ,ow itteloded broohore Seed *1 ndebl yoo tiot warn WE Technical Services PO Box 76684A Atlanta GA 30323 FROM IPAVEY YSTEMS ir really slick trainers little hassles building taken out box before open birds simple build pretty look small parts well sides tail feathers pre cut ready quick assembly Youll air flying own faster ever expected -4 BT-20 three channel trainer 15-25 engines Has fully sheeted flat bottom wing can built optional ailerons 50 span 400 sq area AT-50 four channel advanced trainer 19-30 engines scale look flies rock stable like pattern bird has wide speed range Has 50 span semi-symme trical airfoil 400 sq area Both kits feature rolled plans step-by- h step instructions hardware wheel pantsEIVEY675 TOWER LANE formed gear accurately die andYSTEMSWEST CHESTER PA 19380 machine cut selected woods EoRPORATIoN 215-430-8645 Safety/Preston Continued page 22 some seven miles removed local air port Out normal flightpaths What didnt know about football turned out important day Unknown UW playing Air Force Academy Fal cons brought football team cheerlead ers prairie falcon AND jet fighters low-level pass over stadium several fight ers scheduled halftime self would have problem loca tion slightly above stadium altitude just half-mile north directly flightpath aircraft about wow thousands spectators low-level pass would have fine sky fighters came low-level approach stadium Fortunately lower damn close Glider fighters simultaneously field vision jets looked big pass sudden low fast loud completely unnerved lost control Glider Fortunately companions brought senses landed safely However didnt go back up again thought another pass might made fighters wasnt Having just buzzed extremely lowflying aircraft RAF can identify Dougs momentary disorientation ended letter stating Always always alert care ful attentive cant too careful should always prepared unex pected echo message Have another safe month April 1989 133 GETTING AIRBORNE VOLUME ALL ABOUT BUILDING FLYING COVERING ENGINES AND MORE GETlNG AIRBORNE VOLUME ONE has over 400 large detailed photographs includes topics like selecting radio radio control works learning fly instructor learning Instructor learn basic maneuvers like landing Other chapters explain about ARFs field equipment operating engines assembling airplane easy learning control Installations much cat Number BOKOO9$1295 GETTING AIRBORNE VOLUME TWO includes topics like building strength appearance alignment New plastic film covering techniques developed experts beginner explain get nicad batteries rebuild servo engine airframe Additional installations topics shown much cat Number BOKOl 0$1295 HARRY 8 HIGLEY & SONS INC P o sox 532 GLENwOOD ILL 60425 GETTING AIRBORNE
Edition: Model Aviation - 1989/04
Page Numbers: 14, 16, 18, 20, 22, 133
John Preston Safety12 Comes Flint Nortbansmon Sc NW Washington DC 20015 column provided address Items concern regaidng safety aspects model aviation actMdes Content coIunn however opinion author does necessuily represent official position Academy Model Aeronantics Odorless Cya glue Mounting plates Zenoah G-38 engines flutter Hazardous activities Full-scale threat ODORLESS CyA GLUE Allergic reactions fumes emitted cyanoacrylate CyA glue cures have subject num ber previous Safety columns Modelers have developed sensitivity fumes have adopted various solutions problem have ranged use respirator uncomfortable increasing ventilation workshop very practical winter discon tinuing use products unacceptable Well seems Bob Bill Hunter Satel lite City Inc may have hit ultimate solu tion have previously suf fered discomforting allergic reactions Last week returned two-week Christmas vacation England found package delivered UPS contained sam ples two new products known User Friendly Odorless UFO instant glue thin pen etrating glue bottle red label other thick glue used gap filling packaged bottle green label Some may have already seen advertise ments two new glues able subject products al lergy test myself since Ive experienced res piratory problems previously marketed CyA glues However intend pass sam ples friend has experienced such prob lems past willing have him act guinea pig According information sheet accom panied glue samples UFO glues can used directly white foam dissolving Whether have previously suffered reaction CyA glue fumes seems instant glue will work direcfly foam real plus worth giving try under stand UFO glues currently being shipped dealers local hobby empori um doesnt yet stock might request owner put order Comments readers try products welcome Safety alert Periodically receive letters describe problems modeling products authors have experienced Having neither own testing lab nor budget tests con ducted contractor such letters present dilemma Should rely authenticity reports letters andwithout further verificationpass readers should purge reports brand names leave dark whether may have potentially hazardous product pos session copy letter sent Larry Maynard importer received magazine last month forwarded attention Larry added note letter stated safety information should made available users Zenoah G-38 engines letter de scribed potential problem associated mounting plate engine popular among Big Bird modelers Since Larry like professional engineer Im going accept description problem ouflined letter further investigation pass benefit other modelers may own engine Over Larry am very happy owner three Zenoah G 38 engines have mounted 1 Robinhood 99 2 Sig Morrissey Bravo 3 lowwing aircraft derived Bridis Big Bee three aircraft engine Robinhood has far time probably amounts about three four hours engines mounted 1A-in birch plywood box reinforced corners 34-in blocks through-bolted firewall Now other shoe stamped sheet metal mounting plate engine Robinhood has developed cracks must replaced safety reasons received warning owner hobby store Gardena CA caused make careful investiga tion mounting plates have discussed other G-38 owners have experi enced similar problems whenever steel mount ing plate used am professional engineer involved safety design requirements payloads flown Space Shuttle failure modes have experienced hydrogen embrit tlement plated steel parts under cyclic ie vibrational loads often result cracking similar seen mounting plates appropriate solution problem bake plated parts 3250 F no less 23 hours drive Out hydrogen remaining plat ing process purposes intend replace mounting plates %-in-thick 6061 alumi num plates see works out suggest readers may have model powered Zenoah G-38 installed stamped sheet metal mounting plate should take close look plate see sign cracks developing Thank Larry safety alert Continued page 16 14 Model Aviation DONT SEE A4I $1&IJ 0F YOUR GLfl2ER SINCE THE LOW PASS 8 ThAT JET FieI4TLA Flutter Although college education fi nanced aircraft manufacturer am chanical rather aeronautical engineer So aeronautical engineers write take issue something Safety column pertained discipline Im going argue Ill begin letter Charles Richard Lancaster CA Charles disagreed state ment appeared January 1989 column statement actually something dreamed up rather found letter received another mechanical engineer responding previous request formation predict whether particular design will prone flutter Anyway heres Charles opinion just could let comment made January 1989 issue Model Aviation stand out advising error concerning ex planation wing flutter first paragraph page 23 refer enced publication stated rule thumb used designers full-scale aircraft have center-of-gravity wing entire airplane between leading edge wing 25% chord Wrong wrong wrong wrong minimize onset torsional flutter subsequent modes including bending oscillations center-of-twist elastic axis centerof-gravity wing chord should kept ahead quarter-chord section lifting surface short flutter resistant lifting surface should tend twist about axis lies ahead airfoil section quarter-chord subjected bending Also maintain proper location elastic axis important preserve conti Continued page 18 16 Model Aviation Wingspan 45-in 20 40 engnes 3-channel control Introducing Son Mr Rugged Inc Orchard Grove Drive V-----Royal Oak MI 48067 second generation durable model airplane market has arrived new high-lift wing rugged construction before simplified assembly make DuraPlane lithe easiest forgiving way world become model airplane pilot Since original DuraPlane came market two years ago weve listening what customers have say suggestions own research weve refined original design invite try unique model trainer available new DuraPlane Ilwatch skies BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $1595 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-9640 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited VFI ND GIANTS FOR GIANT SCALE BUFFS N F 00 7OBa e 12 T60 H era 4 3CHa$8 94CH 74 Doolitrlne 08 11 $48 72 Car02U1 /4 L&5 $46 95 Maroaacpo Sport $36i 108 Car 0201/4 LOS $56 80 Hell Spr Scildag 543 60 Dooglee /4-2 Mail $24 107 Aeronro C3 SF 535- 60 Oceral Balidag Frr 30 62 Hoerard Rena ho $65 59 BrernEece MeLA 854 78 Tamer WW Rac S35107 Orooc Beard F8F $54 63 Car Oaelrh Fl iC $4269 Lindhege NX-21 1 $28 84 Car Caelrlc FlIC $5491 tirrdberge NO-SI 1 $39 66 DeHan Caere Rec $2496 WrNW-lNao Raa $48 —s62 HoecMrMaIIigan $3574 C Helidor SB2C4 855 94 HoocMrMolligan $45 108 PairclrPT19 yr $59 eeirrg F-26A Pr $36 60 Waco Taper-wing $36 84 Baeirg F-26A Pt $48PT Waco Taper-Wing $48i 69 Waco C-6 Cabin $36 75 WeelId Lycarder $32 78 Slog $38 106 Weetld Lyearder 549 6089" 2Fard Triratr 4AT $36 55 Loch 11 Electra $30 76 Fard Trier 4 AT $48 0 83 Loch Electra $40 114 Ford Trier 4 AT $63 62 Stineoc 11W 5B7 $18 96 BeIlonce Aircrai $48 tinean T/W 0B7 826 93 L 122 Otinean T/W 087 $38- 580 59 Brietol F, p2-B $30 780 118 Brintol Pt F2-B 845- 124 74 Tarcer Fence $45 62 56 Car WarInc F-40 $34 83 60 Vagr Cereal F46 $35 77W 80 Va8 Caeair P46 $69 63 C Seahoerk P7C1 $45 Loch Liglrtng P38 $38 94 C Seahoeric F7C1 057 " 56 BnpSeeBee Aer $24 108 Sihar 038 AerpI $49 epSaaBae Aer $39 60 Boeing 100 Spar $36 70 Fipor J3 Cab $29 90 Boeing 100 Sport $49106 Piper J-3 Cob $3P72NarrIrropGeerera $48 i.--j 98 Lack Hadnon Berh $38 96 Northrop Goerero $75 63 Gram F6F Hellcat $28 90 StinA looc 31M $06 77 Banino B17G Farc$35 60 StintA Lana 3fM $42 103 Ban 8170 Fart $55 1205 nsA Leer 3 MOB 68 Weed Whirlermnd $32 78 Cancel Cat FBY5A 042 68 N Aeror Naniac $39 104 Cao Co PET SA $56 Booacea VTail $39 65/4 Cl no CI eper $65 77 [aecanlce Sedan $35 97 /4 Ch no Cl oper $70 NA 820 Bomber $49 62 Cat cc NC 4 6$ toMarooder 826 549 94 Ca NC 4 W c Ste oceracees Beanean elan aloe c*re H Sold rhro Onolere Price cab ect change nec 1400 SOc OF- 6124 Pane Aleroyc led Add 10% order cImiFF ng & ne etc USA Con & Mao Blceerhera ice 10% 125% air* Fietarial catalog $200 lincladec PrIce Lictl Frice icc aceiae aloe $100 aIr foreIgn add $100 LEVELANDMODEL&SUPPLY Co 183878 BETtOfT API CLEVELAND OHIO 44182 oeceeereceaara bee 515 PM0 ST ICr LSSTI{2161 9613600 acOccacececc After glance youve probably already guessed CGX 500 built deliver kind season-after-season reliability can make last power panel youll ever have buy So ask yourself does really make sense settle anything less CARL GOLDBERG could own CCX 500 few dollars MODELS INC have correctly grasped what Charles has said letter solution minimizing inflight failure sheet balsa stabilizer what started discussion flutter may equip stiff hardwood leading edge should move elastic axis point front quarter-chord point Right second letter came Joel Chesler senior flutter analyst Northrop Cor poration prime interest hobby competition Free Flight Joel also took exception statement January 1989 column stated Flutter aviation world torsional vibration wing Joels definition Flutter in-flight instability usually caused coupling two forms vibration may may torsional other typically bending control surface rota tion velocity dependent will occur until critical velocity reached Additionally control surface flutter can caused same mechanisms just described depending relative stiffness associ ated pushrodand inertial characteristics control surface thank both Charles Joel taking Continued page 20 nuity torsional resistant structure through Carry time Largest Only Stock 1 out its span closed tube sufficiently strong 2 All-Balsa Kraft Parts World aft resist hending located ahead quarterchord lifting surface section would ensureARFs ZMP alive working flutter resistance may noted such tube KRAFT can made enclosing upper lower sur face structural sheeting between front spar leading edge form D-shaped closed MIDWEST cell torque box throughout span ILLbLIA Authonzed Warranty ServiceFREQUENCY CONVERSION $1000 Discount Regular Repair Moat Makes Modela Converted Tuning Donewith Spectrum Analyzer ____K- LINE Also Service ME rn/C FutabmtyShad Only Full Time Servicenter Ihe Midwesi ll7East Main St Northvil le Michigan 48167 er 1-313-348-0085 SUkHOI Su-26M th span 68 area 810 sq Ins meter 4strohe 120 cquiv Preass*sled fuselage sheeted plug-in wings sheeted stabtin & ruddef e die epoxy cowl texan canopy & illustrated aaehly menual 18 Model Aviation MONARCH AW Sport Pattern span 66 area 7SOsqins meter 4 stroke 80 G0cujn PreaaamrAled fuselage veneered wing ehaped bales parts texan canopy epoxy cowl Illustratd assly Eanusl c ZIMPRO MARKETING ' posoassssoasnuosneam P40 sIsss-arn Kits P& W Model Service 1935 Miss America 84$71961936 Buccaneer 84$5996 1937 Dallaire 108$75161938 Clipper Mk 172$4156 1938 KIoud King 63$42361939 Powerhouse 84$5356 1939 Record Breaker 96$69561938 Trenton Terror 72$4076 1939 Korda Wake 44$19161939 Mercaty 72$5936 1939 Zipper 54$53561940 Ranger 46$3196 1940 Sailplane 78$94761940 50 Long 50$3036 1941 Brigidier 56$40761941 Super Quaker 78$7276 1941 Playboy Jr 54$31161941 Playboy Sr 80$5116 1941 BroOklyn Dodger 56$4236 Midway Model Co Full Kits 1936 Flying Quaker 84$64761938 Powerhouse 50$2996 1937 Long Cabin 79$47161939 AT Spertoer 50$2956 1937 Quaker Flash 67$45561940 Buzzard Bombshell 1937 Air Chief 61$3596 2spankd$8696 I94ONowRuler74$7116 0spankd$3596 above kits qualify Sass events PP & R/C feature rho highest quality machine cut & sanded parts sheet & strip wood wire & window material Most plans original PP rho models easily convertible 3ch R/C Sailpianes Electric Power Gas Kits MIDWAY MODEL COELECTRIC MODEL DESIGN Gnome HLG 60$2400Sky Knight 44 05 Dl$2400 Gtmme2M Older79$3796EledraGFde II 73 05D$3100 Pant Eddie 050$2400Lightning 36 05 0$2400 Uha Mk IV 080$3796Thennic Traveller 05 Dot 0$3100 Electric Playboy0501$2600 Hobby Hum Sensoar Glider 78 05 electric$1800 Astro Challenger 05 Geared$3250 Astro Vihing 05 Geared$3250 Antro POrtedield 15 25 Geared$5996 Autro Spptt 37 05 Direct$2996 Daveys Robin 05 Geared$3371 Daveys Lu Crate 108 Geared$3596 FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL SNIPPING & HANDLING76 Page CATALOGUE UptO $800 add $200$200 pp/lot Class free $801 $2000 add $250when requested order $2001 84500 add $325 $4501 $7000 add $375HOBBY HORN DEer $7008 add $450 CA Addressees add 6% tue Seed MorOn SI [A] MOVISAIMC#&EapsrCheck OBoc 2212 adore up to38 days tsr chedsWeulminater Ca 92684 clearance 893-8311 COD Esact charges phis $108I-Irs Mon-Fri 9AM 5PM huddling Cash Ordy Hazardous activities Readers frequently draw attention send Copies photographs de picting hazardous activities have appeared either newspapers modeling press Two such letters arrived last month first clipping Texas newspa per dont know sent mod eler shall remain anonymous added caption What wrong picture photo depicted RC Pattern-type model flight moment cut ribbon dedicate completion opening new concrete run way Texas club installed flying field Im assuming wrong act de picted photo ends ribbon being held two club members standing opposite sides new runway have no doubt model being piloted experienced modeler radio interference equip ment failure can occur best us Ive attended fun-flys past featured Limbo event ends limbo rib bon held club members Im convinced good practice want stage Limbo event perform ribbon-cutting model its better support ends ribbon poles keep people behind flight line second letter District IV AVP Char lie Spear drew attention photo ap peared Model Aviation showed win ning float parade featured model aircraft caption under picture stated An other Piper quarter-scale taxiing behind float Since taxiing model pic ture have no way knowing whether its pilot Continued page 22 Span85in Length66 Wing areal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdI $21500 plus shipping *1100 Evaryfiring ht swatch kft pbm piscut od puss moompaoemodel z DILIXI Kit $28500 plus slipping $1106 Evarytbing tuE kit bert wlq spain lastaled wIqa stab turtle dash batch & sbtrsed 1116 balsa MAKES htflUitIO GIJICKI AH wood Gloam construction ~gaas cowl pants 2pi plugin wings airtollod tail surfaces No lull hence wtres reqeired FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 HE Ave. Spirit Lake IA S13MI 20 Model Aviation time write define flutter gatlell TR260 leer Fund Aer&eIic Deaip 1/4 Stand-oIl Scala Kit sjut $10300 plus slipping $1100 Cast pasta campy bnq pm pleas turn uris hr vile tat sartacan tattle duck 5 baleb IKON NWST IKON NWST has largest selection giant scale kits ava abe today offer best value modeling dollar Design Building Integrity Scale Fidelity Scale Flight Characteristics stands d IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS Del-IAVILLAND BEAVER 96$17500TAYLORCRAFT90$15595 107 17600 PORTERFIELD COLLEGIATE 84 14595 64 18750 FAIRCHILD24RANGERI 90 21000 46 6295 PORTERFIELD FLY-ABOUT 80 13750 96 18750 WACO MODEL 10 734 19000 WACO TAPER WING 727 18000 fine kits include ormed landing gear cut parts rol horns cranks ws ls lete plans surfaces fully drawn s pants ity hand selected balsa ow acetate ct spruce ruction manual photos TO ORDER Callordropusaline ipwithin3days ling&Shippingis$75OPerKit IKON NWST ox 306 Dept MA Falls ID 83854 773-9001 MA 1009 loose tether safeguard event some reason engine should suddenly go full throttle want feature taxiing models parade strongly urge tethered some manner pilots Full-scale threat As mentioned earlier column spent Christmas visiting relatives England part visit town Malton about 25 miles east city York close North Yorkshire Moors moorland area populated mostly sheep vast undulating area devoid veg etation except heather also designated low-flying area Royal Air Force training activ ities say low mean LOW told supposed stay under 500 ft grew up area moors perfect place first attempts Free Flight Power Rubber models However Id reluctant fly now because Tomados A- lOs dominate skies give virtually no warning ground-hugging approach Which brings experience described recent letter Doug Inkley modeler now resides Arlington VA Doug fol lowing relate football season University Wyoming Saturday late October pro vided bit Indian summer weather com pelled mc novice RC Glider pilot try lit tle Soaring Laramie small town headed favorite Soaring area plateau just north town grasslands Laramie basin great place inexperienced Glider pilot such myself could land just about anywhere site grassy treeless Continued page 133 Box 1063 Lorain Ohio 44055 Phnn 21 6 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. $750 Light Indoor kits $795 OUTDOOR PEANUT Super Scale. NEW Micro X Hornet P30 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber CO Power Kits 8850 SPORT MODELS An Embryo Model 18 Span designed winl beginners ... $850 HARD-TO-FIND ITEMS Early Bird liesue Antique Aircraft *616 True OldeJapanese Tissue lOin 3 cobra*616 Jepansee Tissue 12 inS colors*916 Mkrolite Silver *316 Microfilm Glue Solvent Condenser Paper 3 sheets*460 Plan Ser1ce over 17 Scale Sport Scala ft Peanut Scale Rubber Strip 020 thru 066each *116 3132 thru 5/32each *260 WinderSi 6 MarkllB1 . *1216 Complete une Brown CO Motors Bales Wood Outdoor ft Indoor Sheets ft Stripe Add 10% Poetage mum Postage *160 COMPIETE CATALOG *110 22 Model Aviation 90 OTHER FINE KITS WE OFFER FAIRCHILD 24CORBEN SUPER ACE WARNER SCALE 80 1/5 SCALE 90 13995 $18475 Bill Eftlnger lie lee geet oboeS ecole RIC ho, GOld. Age bolt eoel obbet poweed ceo nodl etoond 1931 end Owe very beet ecele Ilyot ite ii. bOo deelgoed 1/6 ecelo 9/C verelot thot 00010 boildeto ehoold conoidet neol stoleot Light enoogh tot 020 2-cycle enoog enoogh lot 99 4-cycle 81 wingspan 904 sq wing area 51 overall length Fuselage plywood/balsa Wing built-up 1 piece cantilever Tail Surfaces built-up balsa Landing Gear shock-resistant wire PlanN Pattern #RC6S-1$1495 6 -68 length wing span 13- 23 engines 2268 sq wing area 3 4 channel RIC Plan N Pattern Set #RCQS-1 4$2495 Piper Cub J-31 119 wingspan 2800 sq wing area 90 th 19 lbs 4 channel 20- 30 2-cycle engine Plan N Pattern #RC3S-2$2996 bill rein9, ie bonding otowbot ol AMA AMA-AFFs 1401101 ewot Pricen Oto Coerplete Ploy soh-Ansnwbly end Detilod POtI Liete Add $299 Melilna Tebe Setd lot stoohorer eheod cowd Now bochoto 10wing new Plen set lot tUS Einirlo Power denig, bollotin ,ow itteloded broohore Seed *1 ndebl yoo tiot warn WE Technical Services PO Box 76684A Atlanta GA 30323 FROM IPAVEY YSTEMS ir really slick trainers little hassles building taken out box before open birds simple build pretty look small parts well sides tail feathers pre cut ready quick assembly Youll air flying own faster ever expected -4 BT-20 three channel trainer 15-25 engines Has fully sheeted flat bottom wing can built optional ailerons 50 span 400 sq area AT-50 four channel advanced trainer 19-30 engines scale look flies rock stable like pattern bird has wide speed range Has 50 span semi-symme trical airfoil 400 sq area Both kits feature rolled plans step-by- h step instructions hardware wheel pantsEIVEY675 TOWER LANE formed gear accurately die andYSTEMSWEST CHESTER PA 19380 machine cut selected woods EoRPORATIoN 215-430-8645 Safety/Preston Continued page 22 some seven miles removed local air port Out normal flightpaths What didnt know about football turned out important day Unknown UW playing Air Force Academy Fal cons brought football team cheerlead ers prairie falcon AND jet fighters low-level pass over stadium several fight ers scheduled halftime self would have problem loca tion slightly above stadium altitude just half-mile north directly flightpath aircraft about wow thousands spectators low-level pass would have fine sky fighters came low-level approach stadium Fortunately lower damn close Glider fighters simultaneously field vision jets looked big pass sudden low fast loud completely unnerved lost control Glider Fortunately companions brought senses landed safely However didnt go back up again thought another pass might made fighters wasnt Having just buzzed extremely lowflying aircraft RAF can identify Dougs momentary disorientation ended letter stating Always always alert care ful attentive cant too careful should always prepared unex pected echo message Have another safe month April 1989 133 GETTING AIRBORNE VOLUME ALL ABOUT BUILDING FLYING COVERING ENGINES AND MORE GETlNG AIRBORNE VOLUME ONE has over 400 large detailed photographs includes topics like selecting radio radio control works learning fly instructor learning Instructor learn basic maneuvers like landing Other chapters explain about ARFs field equipment operating engines assembling airplane easy learning control Installations much cat Number BOKOO9$1295 GETTING AIRBORNE VOLUME TWO includes topics like building strength appearance alignment New plastic film covering techniques developed experts beginner explain get nicad batteries rebuild servo engine airframe Additional installations topics shown much cat Number BOKOl 0$1295 HARRY 8 HIGLEY & SONS INC P o sox 532 GLENwOOD ILL 60425 GETTING AIRBORNE