John Preston Sfety812Corn Phit Nordiuupton St NW Washington DC column pmvided address Items concern regarding safety aspects model aviation actMties Content column howeveu opinion author does necessadly represent offidal position Academy Model Aemnautics Watch out Some CyA glue debonders contain acetonitrile can cause cyanide poisoning drink enough stab structural failures model fires WARNING has recently come attention some brands cyanoacrylate glue debond ers contain acetonitrile ingested suffi cient quantity can cause cyanide poisoning Acetonitrile also known methyl cyanide also sold removal glue used tach false fingernails am aware two incidents young children ingested acetonitrile sold application under brand name Supernail Liquid Nail Off incidents 16-month-old boy reported have ingested two tablespoons liquid dose proved fatal autopsy report listed cause death cya nide intoxication other incident two-year-old child lieved have ingested much ounce Supemail Liquid Nail Off However after under going severe metabolic acidosis child recov ered because immediate treatment cyanide poi soning administered Debonders sold hobby use generally packaged eyedropper-type bottle such bottle believe would unlikely child would ingest lethal amount contents am told false fingernail debonder re sponsible fatality packaged such bottle conversation chemist Du Pont learned company used sole domestic producer acetonitrile af ter learning fatality company ceased its production substance However appears acetonitrile still produced abroad fore may still active ingredient some de bonders understand debonders sold under Sat ellite City Hot Stuff Sig labels con tain acetonitrile products other manu facturers may also free Nevertheless have children house suggest check work area make sure glues solvents other potentially harmful products safely out reach curious tod dlers record June 1988 American As sociation Poison Control Centers Inc peti tioned US Consumer Product Safety Com mission CPSC require products contain ing acetonitrile sold containers child-resistant caps Whether CPSC will re stab failures discussion inflight failure stabilizer kit-built model October 1988 Safety column resulted quite spate letters subjectnot complimentaly ItI 1TER lNc E IN NAVE oN-&Ai flE odel Aviation Did Waco ARES stab tail becuase flutter Theres subject column spond affirmatively petition remains letter Steve Jacobs postmarked seenKansas City MO contained no return ad dress Steve alleges am chicken s ecause did identili name manufac turer model allegedly involved three incidents stabilizer broke off flight Steve also suggested name Continued page 16 4 IJr%E YA COULJ column changed Advertisers Come First ended letter saying en joys column though doesnt respect Because readers MA AMA mem bers called AMA HQ attempted get address Steve order respond re marks letter However AMA membership roster contains no Steve Jacobs Kansas City its immediate vicinity Therefore Steve reading months column response wrote could mail September 6 1988 follows Dear Steve Perhaps eyes am chicken s ter reader alleging prod uct potentially unsafe opinion suf ficient grounds name brand product Safety column example am assume model ers built aircraft experienced stab failures competent builders could induced failures some less-thansatisfactory building technique past experi ence model question does have inade quate strength its stab would have expected additional reports result article October column did get number letters subject stab failure involved same model dont know long have reading Safety Comes First column have occasions did publish brand name product proof safety problem Remember beat guns asbestos liners Conversely have number times Ive received letters manufactur Continued page 18 'TR260 Freud Aerebulfc Duipm 1/4 Stand-off Scale Kit Span85in Length .. 66 Wingareal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdU $21500 plug whipping $1100 EvarIhIng k watch kit aS nwait wood putt hacoenpieta modal z DELUXE Kit $28500 plus shipping $1100 Leseythiag laS kit hat wing hewn lastaSad wimp stAb tiatla jack hatch Ike pra-akkeud IllS helm MAKES BUIWNI GUICKI A1 wood & foam constructIon Flherglas cowl & pants 2-plece plug-In wings * core airfolled till surfaces INs tail brace wires reqwred FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 Hill Ave Spirit Lake IA 51360 16 Model Aviation q r r -r - r -r- r . - .....eeeeeeo~oeoOooOO@SO6OOSOOOOOOSOSOOOOO .g... 0 0 0 0 fiaeF4 V fV&IV&U7Lfr~VUk4YW0 0 0 0 0 0 0 &~oh144 0 0 0 0 WE WILL CONTINUE TO GIVE 00 PERSONAL SERVICE AND ADVICE ON ANY OF 00 YOUR MODEL PROBLEMS 00 US YOU ARE MODELER NOT NUMBER 0S Now Have Weekly Phone Specials 00 Plus Combos Newcomer 0 00 00 0 Shipping & Handling 5395 COO Add $295 Money Order Only1-800-234-0180 Availabilitv Specifications & Prices Subject change Without Prior Notice ATALOG No service charge Credit Card Orders Personal Checks Mail Orders may held 15 days bank clearanceAfl1afOAMT 00 GUARANTEES & WARRANTIES ON DEFECTIVE MISSING ORTEXAS 101fl1 BROKENITEMSAREHANDLESOIRECTLYBYTHEMANUFACTURERSI~IA MAR ILLO ua _____ 00 @0 00000000 S000000600000 . 0eeS .0000000000000000000 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 RO 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 iIj SerIdellif $10300 plus shipgllng $1100 Cowl putt campy laidag par ie learn cams tar *15 laS aestaces bela deck S hatch 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 standa d fo IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS DeHAVILLAND BEAVER STi TS PLAYBOY 1/3 SCALE 88 $14000 FAIRCHILD 24OHUN UIH AU WARNER SCALE 80 1/5 SCALE 90 13995 $18475 96$17500TAYLORCRAFT90$15595 10717600PORTERFIELD COLLEGIATE8414595 8418750FAIRCHILD24RANGER9021000 466295PORTERFIELD FLY-ABOUT8013750 9618750WACO MODEL 1073419000 WACO TAPER WING72718000 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 ers alleged said something derogatory about products though men tioned name Copies two such letters enclosed sue-happy society would foolish editor publish allegation prod uct unsafe unless accompanied substan dated evidence truly case would foolish unless editor enjoys going court defendant libel suits rec ord manufacturer kit question does advertise Model Aviation Im pick ing up suggestion rename col umn Advertisers Come First Im glad enjoy Safety column hope letter restores respect writings Sincerely John Preston Another letter subject stab failure report came David Hall Carlsbad CA David mechanical engineer related cident sons first RC model suffered in-flight wing failure being flown experienced modeler As result plane engine destroyed failure appeared result insufficient strength models styrofoam wing letter manufac turer identified Steve resulted stronger wing replacement engine Davids letter responded request formation predict whether particular design will subject in-flight flutter following offer article asked suggestions predict whether particular design prone flutter Before begin let us define what mean flutter Continued page 23 MA 1009 Q44 04 dW N KN A-J CLASSIC 3-PAK. o A-J HORNET o 404 INTERCEPTOR5 99 o 74 GLIDER ready fly Note Please add $300 postage handling 000013 packaged modem Add 10% pose additional 0000 0000000000 0000000000 AI IRCRAFT COMPANY ROBox 68132 PORTLAND OR 97268 REAL SCALE MODELING FOR GIANT SCALE BUFFS * 87 Cart Jt44 Jenny$37 t63M Maroode 0 26 $d9 7 Ftr $39j01 OH Mosqaita Bk $42 00 en-Bee $33d 150 OH Maaqceornk $55 Fete Races32190 Otear PTt7Kaydet $56 i,e 060$24 99 Nolk Widaco Fdl 969 0kB$35 71 Soon SC-S 1C471 $35 ack P60$d2 95 Oocg SC-3 1C471 555 94 Cart Honk P60$Sdn Od Hacoks Tocaca 13 $32 a74 Soalittles 00 11$40 64 Stac Sky-Car 510 ~"asc 95 Manocoape Sport 036 72 CarOSUt /4 L&S $dd aj05 Hall Spr Bcltdoo $4 100 co 5201 /4 LAS $56 3 107 Aeroc0 C-S Sc 53560 Socalo M-3 Mail $34 62 Hocoard Raco Ike $45160 Oristal Ocllco0 Ftr 030 70 Tame, W-W Rac $35159 Brooneace MeLA ar Oahk Ft tC 0421107 Oraro Beoct FOF $54 14 Cc CoshO ri rc $54j 69 Lindhern NX-21 1 $30 16 DeHac Ca,et Raa $24 191 Licdhergs NO 211 539 12 HoacMrMcllinao S3196W NW 1 Nov Rac 540 14 HaocMMctligen Sd Farch PT 19 Tr 559 53 Bocino F-36A Fr 036 60 Waco Taper Wng $36 04 Baeio P-26A Fr $40 90 Woco Tap Wino $40 59 Waco C-O Cakin 536 75 Weert d Lysander $32 04 Beech C17-9 Stag $30 105 WestI dLyander 549 *7 96 Reonk C17-0 Stag $49 57 Ford Tcntr 4 AT 036 *....ains.A 55 Lock Elnatra $30176 Ford Trirntt 4-AT 540 02 Lack 11 Electra $40 ltd Ford Trintr dAT 565 in...5S62Srnaarr T/W 087 510196 Bellonce Airarcie $40 Stinean T/W S87 926193 Loerino C-3Anph $69 132 Srnan 0/W 00753 50 Orco J3-F Dccli $39 59 Bristol Ftr P3-B $2O~ 70 Ororo JTF Sack $56 110 Brlsrol Frr F2OB $4 124 Lock Alr Eapress $40 Tamer Fesca $4 63 Lock Air Bopress $24 36 Cv Werlrk F-dc $24 03 Lock Air Ecares $36 eath Babo BaIt 524r 77 WWnra 121 OedL $40 60 Voar Corsair FAU 525 63 C Seofacok F7C1 045 *05 vop Corsair P45 069 94 C Seahoack F7C1 057 70 Lack LoOm o P30 $30 100 Slicar 0-30 Anph $49 56 RepSca-Oee Ao $24 60 Boeng ISO Opo $36 74 RepSeaBee Arm 539 90 Roe no tOO Spot 70 Ploer J-3 Cab539 73 No th op Oooooo $40 156 Fleer J-3 Cok039r 96 No hoo Oarooa 575 9$ Loch Hodeon Otok $30 905rA Lao 3/M 556 63 Oii~t Hellcat $20 605~~A Loco 2/M $43 77 Ooeirn 0-170 Fort $35 120 SrinsA toac 3/M 103 Oee 8170 Fort $55 70 Co,notCatPBYSA $43 60 Wnstl Whirlccind 532 104 CooCatFOY-SA $56 60 N Arrer Nanic, $39 65 MChiro Clipper $65 60 OBonanca v-Tail $39 97 MChina Clipper $7577 Lacoarohe Sedam $25 62 Cortis NC-4$59 72 NA 8-25 Bornkr $49 94 Ccrtien NC-A $69 Sold Okra Sealer Prices schiecl charoe arose reins cetccnea Qc4C0e5 Sloe 51*00 FLat OaerlAOO Mare 55c Up 6l22 patre Alay IncI * Add 10% arders far shipping & ins era USA Can & Mec Elsecohere its 15% 120% airI Pictorial caralog $200 tinclades Price Listl Price list section elare $1 00 ky foreig add $100 CLEVELAND MODEL & SUPPLY Co 5siaa staro scwcsctacacflD*oictlOtls silt tsiEOC-5inO5 tsi niccOOisnsaOOcC 10307B DETROIT AVE CLEVELAND OHIO 44102 orsonecs.soeacsaors hone toO ISP MO ST SST112161 961-3600 rC0s-CacflaOOr 18 Model Aviation ASTRO FLIGHT SYSTEMS Challenger Cobalt 4 cell 020 Direct $ 7645 Challenger Cobalt 0 cell 030 Direct $ 8920 Challenger Cohag 7 cell 05 Direct $10621 ChallengerCobalt l2cell IS Direct $14020 Challenger Cobalt 14 cell 25 Direct $1 6570 Challerrger Cobalt 18 cell 40 Direct $19545 Challenger Cobalt 24 cell 60 Direct $29471 Astro DC/DC Super Charger up 2lt cells Astro AC/DC Charger current adjuot Astro DC/DC Charger Astro Electric Throttle Astro Do-DO Motor Control Electronic AQQBIaI Aedereon Power Pole Conoector 4 bausings / 4 pins Gold Pin Molee Connector Tamiya Connector Hi-Fino Wire 311 00 red & bloch 16 Gai240 Stranrt Daseys 30 Amp Meter t Micro SwOch Harneost 3/16 Flat Oraid br Soldering Saoeries Heat Shrink Tabing Baoeries 20 br 450AFl 000 & 1200SCR Flat Pachs 3 tOreSOAR Flat Pacho 4 br eSOAR & 1200SCR Stacked Packs t Geored $ 0771 Geored $11046 Geantd $12745 Geared $16140 Geared $18606 Geared 021671 5a206 $0500 $3200 $0096 $3196 $200 /yr $210 /pr $150 /pr $200 $1905 $460 $050 /11 $150 /5 $160/It $ieO /5 CELLS 4 Cell 450 mA $1950 0 Cell 450roA $2300 dOSAR $3SOea 6 Cell 900 mA $2920 7 Cell 800 mA $3315 OSOAR $3OSea 6 Cell 900 mA $2980 7 Cell 000 mA $33eS 9000CR $4OSea 6 Cell l200mA $2920 7 Cell l2000rA $3310 2005CR$3OSea A11 packs ant wired Ilat packs Pleane npecly desired connectors ELECTRIC POWER KITS MMC Ultra MK IV 89 Span Sailplane torSO Gear$3796 MMC ElectOc Playboy er Spas Old Timer br 05 Gear$2600 Astro Challenger 73 Span Sailplane tsr 05 Gear$3200 EMD Electra Glide II 73 Span Sailplane br 05$3100 EMD Thenoic Traveler Sailplane 76 Span bOO$3100 EMO Sky Knight 44 Span Trainertor 05$2400 EMD Ligntning 39 Span Aerobatic Sport Model 0002400 MMC Fast Eddie Aerobotic Sport Model br OS$2400 AQrrn Onn 07 S,, a,flrL- O,n 400 SHIPPING & HANDLING76 Page CATALOGUE Up $900 add $200$200 pp/tot Class free $001to $2000 add $200when requested order $2001 $4000 add $325 $4501 $7000 add 0375 Over $7000 add $450HOBBY HORN CA Addressees add 6% tao Send 3 Moron St [A] MO VISA/ MC 95 Eap Date oc 2212 Checkallow opts 30 days totWestminster Ca 52504 checkclearuece COD50001 charges plan $150 853-0311 handling Cash OnlyHrs Mon-Fri 5AM 5PM Flutter aviation world torsional vi bration wing vibration excited airflow over wing rule thumb used designers full-scale aircraft hove center-of-grovity wing entire airplone between leading edge wing ond 25% chord Flutter tail surfaces probably major problem because ore smaller got impression article vibration torsional bending control sur face defined flutter Control surface flut ter usually result poor assembly related what usually called wing flutter re gard failures experienced other modelers flutter may hove cause Without having details cannot give defi nite eauses other reasons failure 0 Undetected damage during handling Defective materials and/or assembly cture could withstand high control surface forces imposed during moneuvers ation combination above vibrations torsional bending combination two can caused airflow engines other sources Davids letter went discuss natural fre quency structures frequency will vibrate disturbed allowed vibrate freely included calculations probable natural frequencies models sta bilizer Despite fact Im also mechani cal engineer hard time following Davids calculations Im going include column bottom line appears flutter can induce stab failureor can develop just because structure insufficient Continued pctge 148 Hobby H0 January 1989 23 AIR WOLF EPOXY FIBERGLASS FUSELAGES TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $20000 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 Safety/Preston Continued page 23 strength carry G loads occur during flight maneuvers latter situation may have likely cause stab failure described another letter received former airline pilot Q hundred years 727s Charles Pyeatt Palos Verdes Estates CA Enclosed Chucks letter photograph see elsewhere column broken stabilizer 85-in-span Waco ARE tended powered Quadra Since Chuck intended use OS 120 four-stroke light ened structure shown plans result Chucks own words Doug 11-year-old grandson RC pi lot early flight made fttst pass moderate wide-open dive stab broke bang resulted violent flutter stopped Doug pulled power off have video watch over over awe model landed OK Im now beef ing stab full-scale ARE didnt have brace wires stab will probably use Before leaving subject Id like thank Jeff Combs Brian Coriley Bill Stodgell L Ar ata Sven Corsak also wrote de scribed in-flight stabilizer failures oc curred different models Sven sent portion vertical stab detached model Perhaps Ill have fu tare column Fire in-flight stab failure in-flight fire Under heading Crash & Bum De cember 1988 column related incident model caught fire after crash said isnt often hear such incident However September 1988 issue Ru Stuf newsletter Green Bay Ruf Club read what first time report inflight fire incident experienced club president Gary Doeren coeditor newsletter wife Sandy titled Big Birds Get Hot picture below see hazards flying large Scale birds gas engine instance muffler came loose flight During flight looked smoker found some residual fuel smoke tank actuality plane onboard fire fire burned hole firewall 5/16-in-thick aircraft ply burned foam around metal tanks melted solder tanks well worst thing about situation could see no ex ternal damage landed plane cowl ing felt little warm no smoke So left plane car overnight didnt dis cover damage until next morning took cowling off reattach muffler illustration firewall newsletter Xerox copy original photograph hence cannot reproduced successfully However can assure clearly showed big hole Safety book few weeks ago returned home work find UPS left package doorstep Upon opening package found spiral-bound book entitled Safety Comes First Frank Burchardt reader Carlsbad NM responsible work art will let letter accompanied book tell about happen people dis like throwing things away Safety vol ume result kind thinking Let ex plain About year ago faced another storage problem very large stack past sues various model magazines including Model Aviation made decision reduce cubic feet magazines cutting out past ing up looseleaf binding interesting plans articles etc Among articles Safety Comes First such valid con tent plan began form mind would use club meeting safety talks Ive safety-oriented person since early days Air Force electronics/nu clear technician natural proverbial gears turned Safety material took new format Now nine chapters categorized safety-related material hand feel work needs have exposure just own club members suggest RC club should have concise ca tegorized material ongoing safety program offered through AMA nominal fee yearly basis looseleaf form clubs Safety Officer would have some needed guidelines operate hope feel will way preserve fine Safety Comes First ar tides future hobbyists FMINI-ELECT RIC OUICKCHARGEQUIET INSTANTSTARTLOWOOST ERIES VL111 $2495 Includes HY-7t B6Props Charge cord andht Batteries Riqalres Connector Access spacers etc $1795VL-111R$2795$3t95 der 7 leads QuickSame VL-111 Remote Battery Holdery VL Flight Battery rt MotorTo subslilute Buf above add $3 00VL Field box 30 size models VL-192$3295$ 995 $1395Inclades HY-42 Motor tory SJ-5 Switch t2 feel engineCharge Plug Cordoctions 148 Model Aviation MINI POWER AT ITS BEST LIGHT WEIGHT MOlS PROPS HY-lO$1495 7 1 gear ratio hgage disengage Free Wheeling grams aicloded ecaps onto meter HY-70R Same HY-70 witl Disconnects Slide Ba ldY-7tasd HY-42 Improned version HY-48 Approry EFC-590 Low cost Quick Charge 4 D'type batteries r FC-492 Ideal Above charge FLIGHT BATTERIES B-52 HY7t 2 x 5t mA-Hr B-t3 HY7t 3o St mA-Hr B-33L IHY-42-Hr B-34L HY42 B-13t BI short Frank has done something have long thought doing myself never quite got around has taken nine years writ ings cutting pasting has organized chapters contains arti cles similar nature Quite monumental task opinion forwarded Franks book Bob Underwood AMAs Technical Director asked Bob would consider Franks suggestion make book available AMA clubs some means other Just last week received copy letter Bob Frank states AMA consider ing making available clubs members might wish have Its just pride author ship makes believe would worthwhile undertaking readers similar opinion suggest drop line contact Bob Underwood directly enough let ters phone calls express interest proj ect might help convince AMA HQ staff go ahead publication Please let us know thoughts Have another safe month Seagull/Byrum Continued page 33 edges using file straightedge Studs made threaded steel rod screwed tapped plywood se curely glued inside wings Multiple lam inations /8-in five-ply work better single piece thicker plywood Use sharp tap avoid splintering wood Sat urate finished plywood thin CyA harden Incidence can adjusted screwing studs out studs themselves drilled tapped screws hold cabane interplane struts Always use Loctite keep screws vibrating loose satisfied way Seagull flies epoxy studs place Once thing permanently place Seagull can assembled field 15 minutes tail wheel takes lot abuse model make tail wheel assembly capable taking punishment used piece %2 music wire anchored nose gear mount Having tried varieties hinges like large Du-Bro type best Notice hinge pockets plans Hinges should also pegged toothpicks Giant Scale models still being lost through use unsuitable hinges careful stabilizer rm elevator rudder built same manner Cut leading edges LE trailing edges TE dimensions shown plans Mark centerline LE TE ball-point pen Pin LE TE over plans using shims tips keep cen terlines parallel building board Ribs cut patterns shown plan also marked center line gluing ribs LE TE centerlines should course meet Sheet top side fin %2 balsa Turn fin over reshim before sheet other side stab spars added after ribs glued LE/TE stab sheeted 6 balsa As fin stab turned over reshimmed other set spars added A6 sheeting glued rudder elevator ribs simple pieces 1/8 x 1-in balsa tapered meet TE Both rudder elevator built directly over plans After construction covered fabric per fullsize Seagull recommend using servo per elevator handle loads case no need join two elevator halves avoid adverse yaw ailerons need about 20/80 differential down-to-up throw right aileron goes up 200 left aileron should go down So didnt build enough differential model initially able obtain electronically adjusting settings Futaba 8FGA radio plans show arrangement should give increased mechanical differen tial over original scheme used course two servos used ailerons top bottom ailerons linked together tie rod done full-scale plane found necessary clude external static balances aile rons prototype large canopy usual focal point model case January 1989 149
Edition: Model Aviation - 1989/01
Page Numbers: 14, 16, 18, 23, 148, 149
John Preston Sfety812Corn Phit Nordiuupton St NW Washington DC column pmvided address Items concern regarding safety aspects model aviation actMties Content column howeveu opinion author does necessadly represent offidal position Academy Model Aemnautics Watch out Some CyA glue debonders contain acetonitrile can cause cyanide poisoning drink enough stab structural failures model fires WARNING has recently come attention some brands cyanoacrylate glue debond ers contain acetonitrile ingested suffi cient quantity can cause cyanide poisoning Acetonitrile also known methyl cyanide also sold removal glue used tach false fingernails am aware two incidents young children ingested acetonitrile sold application under brand name Supernail Liquid Nail Off incidents 16-month-old boy reported have ingested two tablespoons liquid dose proved fatal autopsy report listed cause death cya nide intoxication other incident two-year-old child lieved have ingested much ounce Supemail Liquid Nail Off However after under going severe metabolic acidosis child recov ered because immediate treatment cyanide poi soning administered Debonders sold hobby use generally packaged eyedropper-type bottle such bottle believe would unlikely child would ingest lethal amount contents am told false fingernail debonder re sponsible fatality packaged such bottle conversation chemist Du Pont learned company used sole domestic producer acetonitrile af ter learning fatality company ceased its production substance However appears acetonitrile still produced abroad fore may still active ingredient some de bonders understand debonders sold under Sat ellite City Hot Stuff Sig labels con tain acetonitrile products other manu facturers may also free Nevertheless have children house suggest check work area make sure glues solvents other potentially harmful products safely out reach curious tod dlers record June 1988 American As sociation Poison Control Centers Inc peti tioned US Consumer Product Safety Com mission CPSC require products contain ing acetonitrile sold containers child-resistant caps Whether CPSC will re stab failures discussion inflight failure stabilizer kit-built model October 1988 Safety column resulted quite spate letters subjectnot complimentaly ItI 1TER lNc E IN NAVE oN-&Ai flE odel Aviation Did Waco ARES stab tail becuase flutter Theres subject column spond affirmatively petition remains letter Steve Jacobs postmarked seenKansas City MO contained no return ad dress Steve alleges am chicken s ecause did identili name manufac turer model allegedly involved three incidents stabilizer broke off flight Steve also suggested name Continued page 16 4 IJr%E YA COULJ column changed Advertisers Come First ended letter saying en joys column though doesnt respect Because readers MA AMA mem bers called AMA HQ attempted get address Steve order respond re marks letter However AMA membership roster contains no Steve Jacobs Kansas City its immediate vicinity Therefore Steve reading months column response wrote could mail September 6 1988 follows Dear Steve Perhaps eyes am chicken s ter reader alleging prod uct potentially unsafe opinion suf ficient grounds name brand product Safety column example am assume model ers built aircraft experienced stab failures competent builders could induced failures some less-thansatisfactory building technique past experi ence model question does have inade quate strength its stab would have expected additional reports result article October column did get number letters subject stab failure involved same model dont know long have reading Safety Comes First column have occasions did publish brand name product proof safety problem Remember beat guns asbestos liners Conversely have number times Ive received letters manufactur Continued page 18 'TR260 Freud Aerebulfc Duipm 1/4 Stand-off Scale Kit Span85in Length .. 66 Wingareal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdU $21500 plug whipping $1100 EvarIhIng k watch kit aS nwait wood putt hacoenpieta modal z DELUXE Kit $28500 plus shipping $1100 Leseythiag laS kit hat wing hewn lastaSad wimp stAb tiatla jack hatch Ike pra-akkeud IllS helm MAKES BUIWNI GUICKI A1 wood & foam constructIon Flherglas cowl & pants 2-plece plug-In wings * core airfolled till surfaces INs tail brace wires reqwred FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 Hill Ave Spirit Lake IA 51360 16 Model Aviation q r r -r - r -r- r . - .....eeeeeeo~oeoOooOO@SO6OOSOOOOOOSOSOOOOO .g... 0 0 0 0 fiaeF4 V fV&IV&U7Lfr~VUk4YW0 0 0 0 0 0 0 &~oh144 0 0 0 0 WE WILL CONTINUE TO GIVE 00 PERSONAL SERVICE AND ADVICE ON ANY OF 00 YOUR MODEL PROBLEMS 00 US YOU ARE MODELER NOT NUMBER 0S Now Have Weekly Phone Specials 00 Plus Combos Newcomer 0 00 00 0 Shipping & Handling 5395 COO Add $295 Money Order Only1-800-234-0180 Availabilitv Specifications & Prices Subject change Without Prior Notice ATALOG No service charge Credit Card Orders Personal Checks Mail Orders may held 15 days bank clearanceAfl1afOAMT 00 GUARANTEES & WARRANTIES ON DEFECTIVE MISSING ORTEXAS 101fl1 BROKENITEMSAREHANDLESOIRECTLYBYTHEMANUFACTURERSI~IA MAR ILLO ua _____ 00 @0 00000000 S000000600000 . 0eeS .0000000000000000000 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 RO 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 iIj SerIdellif $10300 plus shipgllng $1100 Cowl putt campy laidag par ie learn cams tar *15 laS aestaces bela deck S hatch 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 standa d fo IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS DeHAVILLAND BEAVER STi TS PLAYBOY 1/3 SCALE 88 $14000 FAIRCHILD 24OHUN UIH AU WARNER SCALE 80 1/5 SCALE 90 13995 $18475 96$17500TAYLORCRAFT90$15595 10717600PORTERFIELD COLLEGIATE8414595 8418750FAIRCHILD24RANGER9021000 466295PORTERFIELD FLY-ABOUT8013750 9618750WACO MODEL 1073419000 WACO TAPER WING72718000 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 ers alleged said something derogatory about products though men tioned name Copies two such letters enclosed sue-happy society would foolish editor publish allegation prod uct unsafe unless accompanied substan dated evidence truly case would foolish unless editor enjoys going court defendant libel suits rec ord manufacturer kit question does advertise Model Aviation Im pick ing up suggestion rename col umn Advertisers Come First Im glad enjoy Safety column hope letter restores respect writings Sincerely John Preston Another letter subject stab failure report came David Hall Carlsbad CA David mechanical engineer related cident sons first RC model suffered in-flight wing failure being flown experienced modeler As result plane engine destroyed failure appeared result insufficient strength models styrofoam wing letter manufac turer identified Steve resulted stronger wing replacement engine Davids letter responded request formation predict whether particular design will subject in-flight flutter following offer article asked suggestions predict whether particular design prone flutter Before begin let us define what mean flutter Continued page 23 MA 1009 Q44 04 dW N KN A-J CLASSIC 3-PAK. o A-J HORNET o 404 INTERCEPTOR5 99 o 74 GLIDER ready fly Note Please add $300 postage handling 000013 packaged modem Add 10% pose additional 0000 0000000000 0000000000 AI IRCRAFT COMPANY ROBox 68132 PORTLAND OR 97268 REAL SCALE MODELING FOR GIANT SCALE BUFFS * 87 Cart Jt44 Jenny$37 t63M Maroode 0 26 $d9 7 Ftr $39j01 OH Mosqaita Bk $42 00 en-Bee $33d 150 OH Maaqceornk $55 Fete Races32190 Otear PTt7Kaydet $56 i,e 060$24 99 Nolk Widaco Fdl 969 0kB$35 71 Soon SC-S 1C471 $35 ack P60$d2 95 Oocg SC-3 1C471 555 94 Cart Honk P60$Sdn Od Hacoks Tocaca 13 $32 a74 Soalittles 00 11$40 64 Stac Sky-Car 510 ~"asc 95 Manocoape Sport 036 72 CarOSUt /4 L&S $dd aj05 Hall Spr Bcltdoo $4 100 co 5201 /4 LAS $56 3 107 Aeroc0 C-S Sc 53560 Socalo M-3 Mail $34 62 Hocoard Raco Ike $45160 Oristal Ocllco0 Ftr 030 70 Tame, W-W Rac $35159 Brooneace MeLA ar Oahk Ft tC 0421107 Oraro Beoct FOF $54 14 Cc CoshO ri rc $54j 69 Lindhern NX-21 1 $30 16 DeHac Ca,et Raa $24 191 Licdhergs NO 211 539 12 HoacMrMcllinao S3196W NW 1 Nov Rac 540 14 HaocMMctligen Sd Farch PT 19 Tr 559 53 Bocino F-36A Fr 036 60 Waco Taper Wng $36 04 Baeio P-26A Fr $40 90 Woco Tap Wino $40 59 Waco C-O Cakin 536 75 Weert d Lysander $32 04 Beech C17-9 Stag $30 105 WestI dLyander 549 *7 96 Reonk C17-0 Stag $49 57 Ford Tcntr 4 AT 036 *....ains.A 55 Lock Elnatra $30176 Ford Trirntt 4-AT 540 02 Lack 11 Electra $40 ltd Ford Trintr dAT 565 in...5S62Srnaarr T/W 087 510196 Bellonce Airarcie $40 Stinean T/W S87 926193 Loerino C-3Anph $69 132 Srnan 0/W 00753 50 Orco J3-F Dccli $39 59 Bristol Ftr P3-B $2O~ 70 Ororo JTF Sack $56 110 Brlsrol Frr F2OB $4 124 Lock Alr Eapress $40 Tamer Fesca $4 63 Lock Air Bopress $24 36 Cv Werlrk F-dc $24 03 Lock Air Ecares $36 eath Babo BaIt 524r 77 WWnra 121 OedL $40 60 Voar Corsair FAU 525 63 C Seofacok F7C1 045 *05 vop Corsair P45 069 94 C Seahoack F7C1 057 70 Lack LoOm o P30 $30 100 Slicar 0-30 Anph $49 56 RepSca-Oee Ao $24 60 Boeng ISO Opo $36 74 RepSeaBee Arm 539 90 Roe no tOO Spot 70 Ploer J-3 Cab539 73 No th op Oooooo $40 156 Fleer J-3 Cok039r 96 No hoo Oarooa 575 9$ Loch Hodeon Otok $30 905rA Lao 3/M 556 63 Oii~t Hellcat $20 605~~A Loco 2/M $43 77 Ooeirn 0-170 Fort $35 120 SrinsA toac 3/M 103 Oee 8170 Fort $55 70 Co,notCatPBYSA $43 60 Wnstl Whirlccind 532 104 CooCatFOY-SA $56 60 N Arrer Nanic, $39 65 MChiro Clipper $65 60 OBonanca v-Tail $39 97 MChina Clipper $7577 Lacoarohe Sedam $25 62 Cortis NC-4$59 72 NA 8-25 Bornkr $49 94 Ccrtien NC-A $69 Sold Okra Sealer Prices schiecl charoe arose reins cetccnea Qc4C0e5 Sloe 51*00 FLat OaerlAOO Mare 55c Up 6l22 patre Alay IncI * Add 10% arders far shipping & ins era USA Can & Mec Elsecohere its 15% 120% airI Pictorial caralog $200 tinclades Price Listl Price list section elare $1 00 ky foreig add $100 CLEVELAND MODEL & SUPPLY Co 5siaa staro scwcsctacacflD*oictlOtls silt tsiEOC-5inO5 tsi niccOOisnsaOOcC 10307B DETROIT AVE CLEVELAND OHIO 44102 orsonecs.soeacsaors hone toO ISP MO ST SST112161 961-3600 rC0s-CacflaOOr 18 Model Aviation ASTRO FLIGHT SYSTEMS Challenger Cobalt 4 cell 020 Direct $ 7645 Challenger Cobalt 0 cell 030 Direct $ 8920 Challenger Cohag 7 cell 05 Direct $10621 ChallengerCobalt l2cell IS Direct $14020 Challenger Cobalt 14 cell 25 Direct $1 6570 Challerrger Cobalt 18 cell 40 Direct $19545 Challenger Cobalt 24 cell 60 Direct $29471 Astro DC/DC Super Charger up 2lt cells Astro AC/DC Charger current adjuot Astro DC/DC Charger Astro Electric Throttle Astro Do-DO Motor Control Electronic AQQBIaI Aedereon Power Pole Conoector 4 bausings / 4 pins Gold Pin Molee Connector Tamiya Connector Hi-Fino Wire 311 00 red & bloch 16 Gai240 Stranrt Daseys 30 Amp Meter t Micro SwOch Harneost 3/16 Flat Oraid br Soldering Saoeries Heat Shrink Tabing Baoeries 20 br 450AFl 000 & 1200SCR Flat Pachs 3 tOreSOAR Flat Pacho 4 br eSOAR & 1200SCR Stacked Packs t Geored $ 0771 Geored $11046 Geantd $12745 Geared $16140 Geared $18606 Geared 021671 5a206 $0500 $3200 $0096 $3196 $200 /yr $210 /pr $150 /pr $200 $1905 $460 $050 /11 $150 /5 $160/It $ieO /5 CELLS 4 Cell 450 mA $1950 0 Cell 450roA $2300 dOSAR $3SOea 6 Cell 900 mA $2920 7 Cell 800 mA $3315 OSOAR $3OSea 6 Cell 900 mA $2980 7 Cell 000 mA $33eS 9000CR $4OSea 6 Cell l200mA $2920 7 Cell l2000rA $3310 2005CR$3OSea A11 packs ant wired Ilat packs Pleane npecly desired connectors ELECTRIC POWER KITS MMC Ultra MK IV 89 Span Sailplane torSO Gear$3796 MMC ElectOc Playboy er Spas Old Timer br 05 Gear$2600 Astro Challenger 73 Span Sailplane tsr 05 Gear$3200 EMD Electra Glide II 73 Span Sailplane br 05$3100 EMD Thenoic Traveler Sailplane 76 Span bOO$3100 EMO Sky Knight 44 Span Trainertor 05$2400 EMD Ligntning 39 Span Aerobatic Sport Model 0002400 MMC Fast Eddie Aerobotic Sport Model br OS$2400 AQrrn Onn 07 S,, a,flrL- O,n 400 SHIPPING & HANDLING76 Page CATALOGUE Up $900 add $200$200 pp/tot Class free $001to $2000 add $200when requested order $2001 $4000 add $325 $4501 $7000 add 0375 Over $7000 add $450HOBBY HORN CA Addressees add 6% tao Send 3 Moron St [A] MO VISA/ MC 95 Eap Date oc 2212 Checkallow opts 30 days totWestminster Ca 52504 checkclearuece COD50001 charges plan $150 853-0311 handling Cash OnlyHrs Mon-Fri 5AM 5PM Flutter aviation world torsional vi bration wing vibration excited airflow over wing rule thumb used designers full-scale aircraft hove center-of-grovity wing entire airplone between leading edge wing ond 25% chord Flutter tail surfaces probably major problem because ore smaller got impression article vibration torsional bending control sur face defined flutter Control surface flut ter usually result poor assembly related what usually called wing flutter re gard failures experienced other modelers flutter may hove cause Without having details cannot give defi nite eauses other reasons failure 0 Undetected damage during handling Defective materials and/or assembly cture could withstand high control surface forces imposed during moneuvers ation combination above vibrations torsional bending combination two can caused airflow engines other sources Davids letter went discuss natural fre quency structures frequency will vibrate disturbed allowed vibrate freely included calculations probable natural frequencies models sta bilizer Despite fact Im also mechani cal engineer hard time following Davids calculations Im going include column bottom line appears flutter can induce stab failureor can develop just because structure insufficient Continued pctge 148 Hobby H0 January 1989 23 AIR WOLF EPOXY FIBERGLASS FUSELAGES TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $20000 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 Safety/Preston Continued page 23 strength carry G loads occur during flight maneuvers latter situation may have likely cause stab failure described another letter received former airline pilot Q hundred years 727s Charles Pyeatt Palos Verdes Estates CA Enclosed Chucks letter photograph see elsewhere column broken stabilizer 85-in-span Waco ARE tended powered Quadra Since Chuck intended use OS 120 four-stroke light ened structure shown plans result Chucks own words Doug 11-year-old grandson RC pi lot early flight made fttst pass moderate wide-open dive stab broke bang resulted violent flutter stopped Doug pulled power off have video watch over over awe model landed OK Im now beef ing stab full-scale ARE didnt have brace wires stab will probably use Before leaving subject Id like thank Jeff Combs Brian Coriley Bill Stodgell L Ar ata Sven Corsak also wrote de scribed in-flight stabilizer failures oc curred different models Sven sent portion vertical stab detached model Perhaps Ill have fu tare column Fire in-flight stab failure in-flight fire Under heading Crash & Bum De cember 1988 column related incident model caught fire after crash said isnt often hear such incident However September 1988 issue Ru Stuf newsletter Green Bay Ruf Club read what first time report inflight fire incident experienced club president Gary Doeren coeditor newsletter wife Sandy titled Big Birds Get Hot picture below see hazards flying large Scale birds gas engine instance muffler came loose flight During flight looked smoker found some residual fuel smoke tank actuality plane onboard fire fire burned hole firewall 5/16-in-thick aircraft ply burned foam around metal tanks melted solder tanks well worst thing about situation could see no ex ternal damage landed plane cowl ing felt little warm no smoke So left plane car overnight didnt dis cover damage until next morning took cowling off reattach muffler illustration firewall newsletter Xerox copy original photograph hence cannot reproduced successfully However can assure clearly showed big hole Safety book few weeks ago returned home work find UPS left package doorstep Upon opening package found spiral-bound book entitled Safety Comes First Frank Burchardt reader Carlsbad NM responsible work art will let letter accompanied book tell about happen people dis like throwing things away Safety vol ume result kind thinking Let ex plain About year ago faced another storage problem very large stack past sues various model magazines including Model Aviation made decision reduce cubic feet magazines cutting out past ing up looseleaf binding interesting plans articles etc Among articles Safety Comes First such valid con tent plan began form mind would use club meeting safety talks Ive safety-oriented person since early days Air Force electronics/nu clear technician natural proverbial gears turned Safety material took new format Now nine chapters categorized safety-related material hand feel work needs have exposure just own club members suggest RC club should have concise ca tegorized material ongoing safety program offered through AMA nominal fee yearly basis looseleaf form clubs Safety Officer would have some needed guidelines operate hope feel will way preserve fine Safety Comes First ar tides future hobbyists FMINI-ELECT RIC OUICKCHARGEQUIET INSTANTSTARTLOWOOST ERIES VL111 $2495 Includes HY-7t B6Props Charge cord andht Batteries Riqalres Connector Access spacers etc $1795VL-111R$2795$3t95 der 7 leads QuickSame VL-111 Remote Battery Holdery VL Flight Battery rt MotorTo subslilute Buf above add $3 00VL Field box 30 size models VL-192$3295$ 995 $1395Inclades HY-42 Motor tory SJ-5 Switch t2 feel engineCharge Plug Cordoctions 148 Model Aviation MINI POWER AT ITS BEST LIGHT WEIGHT MOlS PROPS HY-lO$1495 7 1 gear ratio hgage disengage Free Wheeling grams aicloded ecaps onto meter HY-70R Same HY-70 witl Disconnects Slide Ba ldY-7tasd HY-42 Improned version HY-48 Approry EFC-590 Low cost Quick Charge 4 D'type batteries r FC-492 Ideal Above charge FLIGHT BATTERIES B-52 HY7t 2 x 5t mA-Hr B-t3 HY7t 3o St mA-Hr B-33L IHY-42-Hr B-34L HY42 B-13t BI short Frank has done something have long thought doing myself never quite got around has taken nine years writ ings cutting pasting has organized chapters contains arti cles similar nature Quite monumental task opinion forwarded Franks book Bob Underwood AMAs Technical Director asked Bob would consider Franks suggestion make book available AMA clubs some means other Just last week received copy letter Bob Frank states AMA consider ing making available clubs members might wish have Its just pride author ship makes believe would worthwhile undertaking readers similar opinion suggest drop line contact Bob Underwood directly enough let ters phone calls express interest proj ect might help convince AMA HQ staff go ahead publication Please let us know thoughts Have another safe month Seagull/Byrum Continued page 33 edges using file straightedge Studs made threaded steel rod screwed tapped plywood se curely glued inside wings Multiple lam inations /8-in five-ply work better single piece thicker plywood Use sharp tap avoid splintering wood Sat urate finished plywood thin CyA harden Incidence can adjusted screwing studs out studs themselves drilled tapped screws hold cabane interplane struts Always use Loctite keep screws vibrating loose satisfied way Seagull flies epoxy studs place Once thing permanently place Seagull can assembled field 15 minutes tail wheel takes lot abuse model make tail wheel assembly capable taking punishment used piece %2 music wire anchored nose gear mount Having tried varieties hinges like large Du-Bro type best Notice hinge pockets plans Hinges should also pegged toothpicks Giant Scale models still being lost through use unsuitable hinges careful stabilizer rm elevator rudder built same manner Cut leading edges LE trailing edges TE dimensions shown plans Mark centerline LE TE ball-point pen Pin LE TE over plans using shims tips keep cen terlines parallel building board Ribs cut patterns shown plan also marked center line gluing ribs LE TE centerlines should course meet Sheet top side fin %2 balsa Turn fin over reshim before sheet other side stab spars added after ribs glued LE/TE stab sheeted 6 balsa As fin stab turned over reshimmed other set spars added A6 sheeting glued rudder elevator ribs simple pieces 1/8 x 1-in balsa tapered meet TE Both rudder elevator built directly over plans After construction covered fabric per fullsize Seagull recommend using servo per elevator handle loads case no need join two elevator halves avoid adverse yaw ailerons need about 20/80 differential down-to-up throw right aileron goes up 200 left aileron should go down So didnt build enough differential model initially able obtain electronically adjusting settings Futaba 8FGA radio plans show arrangement should give increased mechanical differen tial over original scheme used course two servos used ailerons top bottom ailerons linked together tie rod done full-scale plane found necessary clude external static balances aile rons prototype large canopy usual focal point model case January 1989 149
Edition: Model Aviation - 1989/01
Page Numbers: 14, 16, 18, 23, 148, 149
John Preston Sfety812Corn Phit Nordiuupton St NW Washington DC column pmvided address Items concern regarding safety aspects model aviation actMties Content column howeveu opinion author does necessadly represent offidal position Academy Model Aemnautics Watch out Some CyA glue debonders contain acetonitrile can cause cyanide poisoning drink enough stab structural failures model fires WARNING has recently come attention some brands cyanoacrylate glue debond ers contain acetonitrile ingested suffi cient quantity can cause cyanide poisoning Acetonitrile also known methyl cyanide also sold removal glue used tach false fingernails am aware two incidents young children ingested acetonitrile sold application under brand name Supernail Liquid Nail Off incidents 16-month-old boy reported have ingested two tablespoons liquid dose proved fatal autopsy report listed cause death cya nide intoxication other incident two-year-old child lieved have ingested much ounce Supemail Liquid Nail Off However after under going severe metabolic acidosis child recov ered because immediate treatment cyanide poi soning administered Debonders sold hobby use generally packaged eyedropper-type bottle such bottle believe would unlikely child would ingest lethal amount contents am told false fingernail debonder re sponsible fatality packaged such bottle conversation chemist Du Pont learned company used sole domestic producer acetonitrile af ter learning fatality company ceased its production substance However appears acetonitrile still produced abroad fore may still active ingredient some de bonders understand debonders sold under Sat ellite City Hot Stuff Sig labels con tain acetonitrile products other manu facturers may also free Nevertheless have children house suggest check work area make sure glues solvents other potentially harmful products safely out reach curious tod dlers record June 1988 American As sociation Poison Control Centers Inc peti tioned US Consumer Product Safety Com mission CPSC require products contain ing acetonitrile sold containers child-resistant caps Whether CPSC will re stab failures discussion inflight failure stabilizer kit-built model October 1988 Safety column resulted quite spate letters subjectnot complimentaly ItI 1TER lNc E IN NAVE oN-&Ai flE odel Aviation Did Waco ARES stab tail becuase flutter Theres subject column spond affirmatively petition remains letter Steve Jacobs postmarked seenKansas City MO contained no return ad dress Steve alleges am chicken s ecause did identili name manufac turer model allegedly involved three incidents stabilizer broke off flight Steve also suggested name Continued page 16 4 IJr%E YA COULJ column changed Advertisers Come First ended letter saying en joys column though doesnt respect Because readers MA AMA mem bers called AMA HQ attempted get address Steve order respond re marks letter However AMA membership roster contains no Steve Jacobs Kansas City its immediate vicinity Therefore Steve reading months column response wrote could mail September 6 1988 follows Dear Steve Perhaps eyes am chicken s ter reader alleging prod uct potentially unsafe opinion suf ficient grounds name brand product Safety column example am assume model ers built aircraft experienced stab failures competent builders could induced failures some less-thansatisfactory building technique past experi ence model question does have inade quate strength its stab would have expected additional reports result article October column did get number letters subject stab failure involved same model dont know long have reading Safety Comes First column have occasions did publish brand name product proof safety problem Remember beat guns asbestos liners Conversely have number times Ive received letters manufactur Continued page 18 'TR260 Freud Aerebulfc Duipm 1/4 Stand-off Scale Kit Span85in Length .. 66 Wingareal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdU $21500 plug whipping $1100 EvarIhIng k watch kit aS nwait wood putt hacoenpieta modal z DELUXE Kit $28500 plus shipping $1100 Leseythiag laS kit hat wing hewn lastaSad wimp stAb tiatla jack hatch Ike pra-akkeud IllS helm MAKES BUIWNI GUICKI A1 wood & foam constructIon Flherglas cowl & pants 2-plece plug-In wings * core airfolled till surfaces INs tail brace wires reqwred FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 Hill Ave Spirit Lake IA 51360 16 Model Aviation q r r -r - r -r- r . - .....eeeeeeo~oeoOooOO@SO6OOSOOOOOOSOSOOOOO .g... 0 0 0 0 fiaeF4 V fV&IV&U7Lfr~VUk4YW0 0 0 0 0 0 0 &~oh144 0 0 0 0 WE WILL CONTINUE TO GIVE 00 PERSONAL SERVICE AND ADVICE ON ANY OF 00 YOUR MODEL PROBLEMS 00 US YOU ARE MODELER NOT NUMBER 0S Now Have Weekly Phone Specials 00 Plus Combos Newcomer 0 00 00 0 Shipping & Handling 5395 COO Add $295 Money Order Only1-800-234-0180 Availabilitv Specifications & Prices Subject change Without Prior Notice ATALOG No service charge Credit Card Orders Personal Checks Mail Orders may held 15 days bank clearanceAfl1afOAMT 00 GUARANTEES & WARRANTIES ON DEFECTIVE MISSING ORTEXAS 101fl1 BROKENITEMSAREHANDLESOIRECTLYBYTHEMANUFACTURERSI~IA MAR ILLO ua _____ 00 @0 00000000 S000000600000 . 0eeS .0000000000000000000 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 RO 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 iIj SerIdellif $10300 plus shipgllng $1100 Cowl putt campy laidag par ie learn cams tar *15 laS aestaces bela deck S hatch 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 standa d fo IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS DeHAVILLAND BEAVER STi TS PLAYBOY 1/3 SCALE 88 $14000 FAIRCHILD 24OHUN UIH AU WARNER SCALE 80 1/5 SCALE 90 13995 $18475 96$17500TAYLORCRAFT90$15595 10717600PORTERFIELD COLLEGIATE8414595 8418750FAIRCHILD24RANGER9021000 466295PORTERFIELD FLY-ABOUT8013750 9618750WACO MODEL 1073419000 WACO TAPER WING72718000 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 ers alleged said something derogatory about products though men tioned name Copies two such letters enclosed sue-happy society would foolish editor publish allegation prod uct unsafe unless accompanied substan dated evidence truly case would foolish unless editor enjoys going court defendant libel suits rec ord manufacturer kit question does advertise Model Aviation Im pick ing up suggestion rename col umn Advertisers Come First Im glad enjoy Safety column hope letter restores respect writings Sincerely John Preston Another letter subject stab failure report came David Hall Carlsbad CA David mechanical engineer related cident sons first RC model suffered in-flight wing failure being flown experienced modeler As result plane engine destroyed failure appeared result insufficient strength models styrofoam wing letter manufac turer identified Steve resulted stronger wing replacement engine Davids letter responded request formation predict whether particular design will subject in-flight flutter following offer article asked suggestions predict whether particular design prone flutter Before begin let us define what mean flutter Continued page 23 MA 1009 Q44 04 dW N KN A-J CLASSIC 3-PAK. o A-J HORNET o 404 INTERCEPTOR5 99 o 74 GLIDER ready fly Note Please add $300 postage handling 000013 packaged modem Add 10% pose additional 0000 0000000000 0000000000 AI IRCRAFT COMPANY ROBox 68132 PORTLAND OR 97268 REAL SCALE MODELING FOR GIANT SCALE BUFFS * 87 Cart Jt44 Jenny$37 t63M Maroode 0 26 $d9 7 Ftr $39j01 OH Mosqaita Bk $42 00 en-Bee $33d 150 OH Maaqceornk $55 Fete Races32190 Otear PTt7Kaydet $56 i,e 060$24 99 Nolk Widaco Fdl 969 0kB$35 71 Soon SC-S 1C471 $35 ack P60$d2 95 Oocg SC-3 1C471 555 94 Cart Honk P60$Sdn Od Hacoks Tocaca 13 $32 a74 Soalittles 00 11$40 64 Stac Sky-Car 510 ~"asc 95 Manocoape Sport 036 72 CarOSUt /4 L&S $dd aj05 Hall Spr Bcltdoo $4 100 co 5201 /4 LAS $56 3 107 Aeroc0 C-S Sc 53560 Socalo M-3 Mail $34 62 Hocoard Raco Ike $45160 Oristal Ocllco0 Ftr 030 70 Tame, W-W Rac $35159 Brooneace MeLA ar Oahk Ft tC 0421107 Oraro Beoct FOF $54 14 Cc CoshO ri rc $54j 69 Lindhern NX-21 1 $30 16 DeHac Ca,et Raa $24 191 Licdhergs NO 211 539 12 HoacMrMcllinao S3196W NW 1 Nov Rac 540 14 HaocMMctligen Sd Farch PT 19 Tr 559 53 Bocino F-36A Fr 036 60 Waco Taper Wng $36 04 Baeio P-26A Fr $40 90 Woco Tap Wino $40 59 Waco C-O Cakin 536 75 Weert d Lysander $32 04 Beech C17-9 Stag $30 105 WestI dLyander 549 *7 96 Reonk C17-0 Stag $49 57 Ford Tcntr 4 AT 036 *....ains.A 55 Lock Elnatra $30176 Ford Trirntt 4-AT 540 02 Lack 11 Electra $40 ltd Ford Trintr dAT 565 in...5S62Srnaarr T/W 087 510196 Bellonce Airarcie $40 Stinean T/W S87 926193 Loerino C-3Anph $69 132 Srnan 0/W 00753 50 Orco J3-F Dccli $39 59 Bristol Ftr P3-B $2O~ 70 Ororo JTF Sack $56 110 Brlsrol Frr F2OB $4 124 Lock Alr Eapress $40 Tamer Fesca $4 63 Lock Air Bopress $24 36 Cv Werlrk F-dc $24 03 Lock Air Ecares $36 eath Babo BaIt 524r 77 WWnra 121 OedL $40 60 Voar Corsair FAU 525 63 C Seofacok F7C1 045 *05 vop Corsair P45 069 94 C Seahoack F7C1 057 70 Lack LoOm o P30 $30 100 Slicar 0-30 Anph $49 56 RepSca-Oee Ao $24 60 Boeng ISO Opo $36 74 RepSeaBee Arm 539 90 Roe no tOO Spot 70 Ploer J-3 Cab539 73 No th op Oooooo $40 156 Fleer J-3 Cok039r 96 No hoo Oarooa 575 9$ Loch Hodeon Otok $30 905rA Lao 3/M 556 63 Oii~t Hellcat $20 605~~A Loco 2/M $43 77 Ooeirn 0-170 Fort $35 120 SrinsA toac 3/M 103 Oee 8170 Fort $55 70 Co,notCatPBYSA $43 60 Wnstl Whirlccind 532 104 CooCatFOY-SA $56 60 N Arrer Nanic, $39 65 MChiro Clipper $65 60 OBonanca v-Tail $39 97 MChina Clipper $7577 Lacoarohe Sedam $25 62 Cortis NC-4$59 72 NA 8-25 Bornkr $49 94 Ccrtien NC-A $69 Sold Okra Sealer Prices schiecl charoe arose reins cetccnea Qc4C0e5 Sloe 51*00 FLat OaerlAOO Mare 55c Up 6l22 patre Alay IncI * Add 10% arders far shipping & ins era USA Can & Mec Elsecohere its 15% 120% airI Pictorial caralog $200 tinclades Price Listl Price list section elare $1 00 ky foreig add $100 CLEVELAND MODEL & SUPPLY Co 5siaa staro scwcsctacacflD*oictlOtls silt tsiEOC-5inO5 tsi niccOOisnsaOOcC 10307B DETROIT AVE CLEVELAND OHIO 44102 orsonecs.soeacsaors hone toO ISP MO ST SST112161 961-3600 rC0s-CacflaOOr 18 Model Aviation ASTRO FLIGHT SYSTEMS Challenger Cobalt 4 cell 020 Direct $ 7645 Challenger Cobalt 0 cell 030 Direct $ 8920 Challenger Cohag 7 cell 05 Direct $10621 ChallengerCobalt l2cell IS Direct $14020 Challenger Cobalt 14 cell 25 Direct $1 6570 Challerrger Cobalt 18 cell 40 Direct $19545 Challenger Cobalt 24 cell 60 Direct $29471 Astro DC/DC Super Charger up 2lt cells Astro AC/DC Charger current adjuot Astro DC/DC Charger Astro Electric Throttle Astro Do-DO Motor Control Electronic AQQBIaI Aedereon Power Pole Conoector 4 bausings / 4 pins Gold Pin Molee Connector Tamiya Connector Hi-Fino Wire 311 00 red & bloch 16 Gai240 Stranrt Daseys 30 Amp Meter t Micro SwOch Harneost 3/16 Flat Oraid br Soldering Saoeries Heat Shrink Tabing Baoeries 20 br 450AFl 000 & 1200SCR Flat Pachs 3 tOreSOAR Flat Pacho 4 br eSOAR & 1200SCR Stacked Packs t Geored $ 0771 Geored $11046 Geantd $12745 Geared $16140 Geared $18606 Geared 021671 5a206 $0500 $3200 $0096 $3196 $200 /yr $210 /pr $150 /pr $200 $1905 $460 $050 /11 $150 /5 $160/It $ieO /5 CELLS 4 Cell 450 mA $1950 0 Cell 450roA $2300 dOSAR $3SOea 6 Cell 900 mA $2920 7 Cell 800 mA $3315 OSOAR $3OSea 6 Cell 900 mA $2980 7 Cell 000 mA $33eS 9000CR $4OSea 6 Cell l200mA $2920 7 Cell l2000rA $3310 2005CR$3OSea A11 packs ant wired Ilat packs Pleane npecly desired connectors ELECTRIC POWER KITS MMC Ultra MK IV 89 Span Sailplane torSO Gear$3796 MMC ElectOc Playboy er Spas Old Timer br 05 Gear$2600 Astro Challenger 73 Span Sailplane tsr 05 Gear$3200 EMD Electra Glide II 73 Span Sailplane br 05$3100 EMD Thenoic Traveler Sailplane 76 Span bOO$3100 EMO Sky Knight 44 Span Trainertor 05$2400 EMD Ligntning 39 Span Aerobatic Sport Model 0002400 MMC Fast Eddie Aerobotic Sport Model br OS$2400 AQrrn Onn 07 S,, a,flrL- O,n 400 SHIPPING & HANDLING76 Page CATALOGUE Up $900 add $200$200 pp/tot Class free $001to $2000 add $200when requested order $2001 $4000 add $325 $4501 $7000 add 0375 Over $7000 add $450HOBBY HORN CA Addressees add 6% tao Send 3 Moron St [A] MO VISA/ MC 95 Eap Date oc 2212 Checkallow opts 30 days totWestminster Ca 52504 checkclearuece COD50001 charges plan $150 853-0311 handling Cash OnlyHrs Mon-Fri 5AM 5PM Flutter aviation world torsional vi bration wing vibration excited airflow over wing rule thumb used designers full-scale aircraft hove center-of-grovity wing entire airplone between leading edge wing ond 25% chord Flutter tail surfaces probably major problem because ore smaller got impression article vibration torsional bending control sur face defined flutter Control surface flut ter usually result poor assembly related what usually called wing flutter re gard failures experienced other modelers flutter may hove cause Without having details cannot give defi nite eauses other reasons failure 0 Undetected damage during handling Defective materials and/or assembly cture could withstand high control surface forces imposed during moneuvers ation combination above vibrations torsional bending combination two can caused airflow engines other sources Davids letter went discuss natural fre quency structures frequency will vibrate disturbed allowed vibrate freely included calculations probable natural frequencies models sta bilizer Despite fact Im also mechani cal engineer hard time following Davids calculations Im going include column bottom line appears flutter can induce stab failureor can develop just because structure insufficient Continued pctge 148 Hobby H0 January 1989 23 AIR WOLF EPOXY FIBERGLASS FUSELAGES TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $20000 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 Safety/Preston Continued page 23 strength carry G loads occur during flight maneuvers latter situation may have likely cause stab failure described another letter received former airline pilot Q hundred years 727s Charles Pyeatt Palos Verdes Estates CA Enclosed Chucks letter photograph see elsewhere column broken stabilizer 85-in-span Waco ARE tended powered Quadra Since Chuck intended use OS 120 four-stroke light ened structure shown plans result Chucks own words Doug 11-year-old grandson RC pi lot early flight made fttst pass moderate wide-open dive stab broke bang resulted violent flutter stopped Doug pulled power off have video watch over over awe model landed OK Im now beef ing stab full-scale ARE didnt have brace wires stab will probably use Before leaving subject Id like thank Jeff Combs Brian Coriley Bill Stodgell L Ar ata Sven Corsak also wrote de scribed in-flight stabilizer failures oc curred different models Sven sent portion vertical stab detached model Perhaps Ill have fu tare column Fire in-flight stab failure in-flight fire Under heading Crash & Bum De cember 1988 column related incident model caught fire after crash said isnt often hear such incident However September 1988 issue Ru Stuf newsletter Green Bay Ruf Club read what first time report inflight fire incident experienced club president Gary Doeren coeditor newsletter wife Sandy titled Big Birds Get Hot picture below see hazards flying large Scale birds gas engine instance muffler came loose flight During flight looked smoker found some residual fuel smoke tank actuality plane onboard fire fire burned hole firewall 5/16-in-thick aircraft ply burned foam around metal tanks melted solder tanks well worst thing about situation could see no ex ternal damage landed plane cowl ing felt little warm no smoke So left plane car overnight didnt dis cover damage until next morning took cowling off reattach muffler illustration firewall newsletter Xerox copy original photograph hence cannot reproduced successfully However can assure clearly showed big hole Safety book few weeks ago returned home work find UPS left package doorstep Upon opening package found spiral-bound book entitled Safety Comes First Frank Burchardt reader Carlsbad NM responsible work art will let letter accompanied book tell about happen people dis like throwing things away Safety vol ume result kind thinking Let ex plain About year ago faced another storage problem very large stack past sues various model magazines including Model Aviation made decision reduce cubic feet magazines cutting out past ing up looseleaf binding interesting plans articles etc Among articles Safety Comes First such valid con tent plan began form mind would use club meeting safety talks Ive safety-oriented person since early days Air Force electronics/nu clear technician natural proverbial gears turned Safety material took new format Now nine chapters categorized safety-related material hand feel work needs have exposure just own club members suggest RC club should have concise ca tegorized material ongoing safety program offered through AMA nominal fee yearly basis looseleaf form clubs Safety Officer would have some needed guidelines operate hope feel will way preserve fine Safety Comes First ar tides future hobbyists FMINI-ELECT RIC OUICKCHARGEQUIET INSTANTSTARTLOWOOST ERIES VL111 $2495 Includes HY-7t B6Props Charge cord andht Batteries Riqalres Connector Access spacers etc $1795VL-111R$2795$3t95 der 7 leads QuickSame VL-111 Remote Battery Holdery VL Flight Battery rt MotorTo subslilute Buf above add $3 00VL Field box 30 size models VL-192$3295$ 995 $1395Inclades HY-42 Motor tory SJ-5 Switch t2 feel engineCharge Plug Cordoctions 148 Model Aviation MINI POWER AT ITS BEST LIGHT WEIGHT MOlS PROPS HY-lO$1495 7 1 gear ratio hgage disengage Free Wheeling grams aicloded ecaps onto meter HY-70R Same HY-70 witl Disconnects Slide Ba ldY-7tasd HY-42 Improned version HY-48 Approry EFC-590 Low cost Quick Charge 4 D'type batteries r FC-492 Ideal Above charge FLIGHT BATTERIES B-52 HY7t 2 x 5t mA-Hr B-t3 HY7t 3o St mA-Hr B-33L IHY-42-Hr B-34L HY42 B-13t BI short Frank has done something have long thought doing myself never quite got around has taken nine years writ ings cutting pasting has organized chapters contains arti cles similar nature Quite monumental task opinion forwarded Franks book Bob Underwood AMAs Technical Director asked Bob would consider Franks suggestion make book available AMA clubs some means other Just last week received copy letter Bob Frank states AMA consider ing making available clubs members might wish have Its just pride author ship makes believe would worthwhile undertaking readers similar opinion suggest drop line contact Bob Underwood directly enough let ters phone calls express interest proj ect might help convince AMA HQ staff go ahead publication Please let us know thoughts Have another safe month Seagull/Byrum Continued page 33 edges using file straightedge Studs made threaded steel rod screwed tapped plywood se curely glued inside wings Multiple lam inations /8-in five-ply work better single piece thicker plywood Use sharp tap avoid splintering wood Sat urate finished plywood thin CyA harden Incidence can adjusted screwing studs out studs themselves drilled tapped screws hold cabane interplane struts Always use Loctite keep screws vibrating loose satisfied way Seagull flies epoxy studs place Once thing permanently place Seagull can assembled field 15 minutes tail wheel takes lot abuse model make tail wheel assembly capable taking punishment used piece %2 music wire anchored nose gear mount Having tried varieties hinges like large Du-Bro type best Notice hinge pockets plans Hinges should also pegged toothpicks Giant Scale models still being lost through use unsuitable hinges careful stabilizer rm elevator rudder built same manner Cut leading edges LE trailing edges TE dimensions shown plans Mark centerline LE TE ball-point pen Pin LE TE over plans using shims tips keep cen terlines parallel building board Ribs cut patterns shown plan also marked center line gluing ribs LE TE centerlines should course meet Sheet top side fin %2 balsa Turn fin over reshim before sheet other side stab spars added after ribs glued LE/TE stab sheeted 6 balsa As fin stab turned over reshimmed other set spars added A6 sheeting glued rudder elevator ribs simple pieces 1/8 x 1-in balsa tapered meet TE Both rudder elevator built directly over plans After construction covered fabric per fullsize Seagull recommend using servo per elevator handle loads case no need join two elevator halves avoid adverse yaw ailerons need about 20/80 differential down-to-up throw right aileron goes up 200 left aileron should go down So didnt build enough differential model initially able obtain electronically adjusting settings Futaba 8FGA radio plans show arrangement should give increased mechanical differen tial over original scheme used course two servos used ailerons top bottom ailerons linked together tie rod done full-scale plane found necessary clude external static balances aile rons prototype large canopy usual focal point model case January 1989 149
Edition: Model Aviation - 1989/01
Page Numbers: 14, 16, 18, 23, 148, 149
John Preston Sfety812Corn Phit Nordiuupton St NW Washington DC column pmvided address Items concern regarding safety aspects model aviation actMties Content column howeveu opinion author does necessadly represent offidal position Academy Model Aemnautics Watch out Some CyA glue debonders contain acetonitrile can cause cyanide poisoning drink enough stab structural failures model fires WARNING has recently come attention some brands cyanoacrylate glue debond ers contain acetonitrile ingested suffi cient quantity can cause cyanide poisoning Acetonitrile also known methyl cyanide also sold removal glue used tach false fingernails am aware two incidents young children ingested acetonitrile sold application under brand name Supernail Liquid Nail Off incidents 16-month-old boy reported have ingested two tablespoons liquid dose proved fatal autopsy report listed cause death cya nide intoxication other incident two-year-old child lieved have ingested much ounce Supemail Liquid Nail Off However after under going severe metabolic acidosis child recov ered because immediate treatment cyanide poi soning administered Debonders sold hobby use generally packaged eyedropper-type bottle such bottle believe would unlikely child would ingest lethal amount contents am told false fingernail debonder re sponsible fatality packaged such bottle conversation chemist Du Pont learned company used sole domestic producer acetonitrile af ter learning fatality company ceased its production substance However appears acetonitrile still produced abroad fore may still active ingredient some de bonders understand debonders sold under Sat ellite City Hot Stuff Sig labels con tain acetonitrile products other manu facturers may also free Nevertheless have children house suggest check work area make sure glues solvents other potentially harmful products safely out reach curious tod dlers record June 1988 American As sociation Poison Control Centers Inc peti tioned US Consumer Product Safety Com mission CPSC require products contain ing acetonitrile sold containers child-resistant caps Whether CPSC will re stab failures discussion inflight failure stabilizer kit-built model October 1988 Safety column resulted quite spate letters subjectnot complimentaly ItI 1TER lNc E IN NAVE oN-&Ai flE odel Aviation Did Waco ARES stab tail becuase flutter Theres subject column spond affirmatively petition remains letter Steve Jacobs postmarked seenKansas City MO contained no return ad dress Steve alleges am chicken s ecause did identili name manufac turer model allegedly involved three incidents stabilizer broke off flight Steve also suggested name Continued page 16 4 IJr%E YA COULJ column changed Advertisers Come First ended letter saying en joys column though doesnt respect Because readers MA AMA mem bers called AMA HQ attempted get address Steve order respond re marks letter However AMA membership roster contains no Steve Jacobs Kansas City its immediate vicinity Therefore Steve reading months column response wrote could mail September 6 1988 follows Dear Steve Perhaps eyes am chicken s ter reader alleging prod uct potentially unsafe opinion suf ficient grounds name brand product Safety column example am assume model ers built aircraft experienced stab failures competent builders could induced failures some less-thansatisfactory building technique past experi ence model question does have inade quate strength its stab would have expected additional reports result article October column did get number letters subject stab failure involved same model dont know long have reading Safety Comes First column have occasions did publish brand name product proof safety problem Remember beat guns asbestos liners Conversely have number times Ive received letters manufactur Continued page 18 'TR260 Freud Aerebulfc Duipm 1/4 Stand-off Scale Kit Span85in Length .. 66 Wingareal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdU $21500 plug whipping $1100 EvarIhIng k watch kit aS nwait wood putt hacoenpieta modal z DELUXE Kit $28500 plus shipping $1100 Leseythiag laS kit hat wing hewn lastaSad wimp stAb tiatla jack hatch Ike pra-akkeud IllS helm MAKES BUIWNI GUICKI A1 wood & foam constructIon Flherglas cowl & pants 2-plece plug-In wings * core airfolled till surfaces INs tail brace wires reqwred FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 Hill Ave Spirit Lake IA 51360 16 Model Aviation q r r -r - r -r- r . - .....eeeeeeo~oeoOooOO@SO6OOSOOOOOOSOSOOOOO .g... 0 0 0 0 fiaeF4 V fV&IV&U7Lfr~VUk4YW0 0 0 0 0 0 0 &~oh144 0 0 0 0 WE WILL CONTINUE TO GIVE 00 PERSONAL SERVICE AND ADVICE ON ANY OF 00 YOUR MODEL PROBLEMS 00 US YOU ARE MODELER NOT NUMBER 0S Now Have Weekly Phone Specials 00 Plus Combos Newcomer 0 00 00 0 Shipping & Handling 5395 COO Add $295 Money Order Only1-800-234-0180 Availabilitv Specifications & Prices Subject change Without Prior Notice ATALOG No service charge Credit Card Orders Personal Checks Mail Orders may held 15 days bank clearanceAfl1afOAMT 00 GUARANTEES & WARRANTIES ON DEFECTIVE MISSING ORTEXAS 101fl1 BROKENITEMSAREHANDLESOIRECTLYBYTHEMANUFACTURERSI~IA MAR ILLO ua _____ 00 @0 00000000 S000000600000 . 0eeS .0000000000000000000 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 RO 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 iIj SerIdellif $10300 plus shipgllng $1100 Cowl putt campy laidag par ie learn cams tar *15 laS aestaces bela deck S hatch 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 standa d fo IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS DeHAVILLAND BEAVER STi TS PLAYBOY 1/3 SCALE 88 $14000 FAIRCHILD 24OHUN UIH AU WARNER SCALE 80 1/5 SCALE 90 13995 $18475 96$17500TAYLORCRAFT90$15595 10717600PORTERFIELD COLLEGIATE8414595 8418750FAIRCHILD24RANGER9021000 466295PORTERFIELD FLY-ABOUT8013750 9618750WACO MODEL 1073419000 WACO TAPER WING72718000 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 ers alleged said something derogatory about products though men tioned name Copies two such letters enclosed sue-happy society would foolish editor publish allegation prod uct unsafe unless accompanied substan dated evidence truly case would foolish unless editor enjoys going court defendant libel suits rec ord manufacturer kit question does advertise Model Aviation Im pick ing up suggestion rename col umn Advertisers Come First Im glad enjoy Safety column hope letter restores respect writings Sincerely John Preston Another letter subject stab failure report came David Hall Carlsbad CA David mechanical engineer related cident sons first RC model suffered in-flight wing failure being flown experienced modeler As result plane engine destroyed failure appeared result insufficient strength models styrofoam wing letter manufac turer identified Steve resulted stronger wing replacement engine Davids letter responded request formation predict whether particular design will subject in-flight flutter following offer article asked suggestions predict whether particular design prone flutter Before begin let us define what mean flutter Continued page 23 MA 1009 Q44 04 dW N KN A-J CLASSIC 3-PAK. o A-J HORNET o 404 INTERCEPTOR5 99 o 74 GLIDER ready fly Note Please add $300 postage handling 000013 packaged modem Add 10% pose additional 0000 0000000000 0000000000 AI IRCRAFT COMPANY ROBox 68132 PORTLAND OR 97268 REAL SCALE MODELING FOR GIANT SCALE BUFFS * 87 Cart Jt44 Jenny$37 t63M Maroode 0 26 $d9 7 Ftr $39j01 OH Mosqaita Bk $42 00 en-Bee $33d 150 OH Maaqceornk $55 Fete Races32190 Otear PTt7Kaydet $56 i,e 060$24 99 Nolk Widaco Fdl 969 0kB$35 71 Soon SC-S 1C471 $35 ack P60$d2 95 Oocg SC-3 1C471 555 94 Cart Honk P60$Sdn Od Hacoks Tocaca 13 $32 a74 Soalittles 00 11$40 64 Stac Sky-Car 510 ~"asc 95 Manocoape Sport 036 72 CarOSUt /4 L&S $dd aj05 Hall Spr Bcltdoo $4 100 co 5201 /4 LAS $56 3 107 Aeroc0 C-S Sc 53560 Socalo M-3 Mail $34 62 Hocoard Raco Ike $45160 Oristal Ocllco0 Ftr 030 70 Tame, W-W Rac $35159 Brooneace MeLA ar Oahk Ft tC 0421107 Oraro Beoct FOF $54 14 Cc CoshO ri rc $54j 69 Lindhern NX-21 1 $30 16 DeHac Ca,et Raa $24 191 Licdhergs NO 211 539 12 HoacMrMcllinao S3196W NW 1 Nov Rac 540 14 HaocMMctligen Sd Farch PT 19 Tr 559 53 Bocino F-36A Fr 036 60 Waco Taper Wng $36 04 Baeio P-26A Fr $40 90 Woco Tap Wino $40 59 Waco C-O Cakin 536 75 Weert d Lysander $32 04 Beech C17-9 Stag $30 105 WestI dLyander 549 *7 96 Reonk C17-0 Stag $49 57 Ford Tcntr 4 AT 036 *....ains.A 55 Lock Elnatra $30176 Ford Trirntt 4-AT 540 02 Lack 11 Electra $40 ltd Ford Trintr dAT 565 in...5S62Srnaarr T/W 087 510196 Bellonce Airarcie $40 Stinean T/W S87 926193 Loerino C-3Anph $69 132 Srnan 0/W 00753 50 Orco J3-F Dccli $39 59 Bristol Ftr P3-B $2O~ 70 Ororo JTF Sack $56 110 Brlsrol Frr F2OB $4 124 Lock Alr Eapress $40 Tamer Fesca $4 63 Lock Air Bopress $24 36 Cv Werlrk F-dc $24 03 Lock Air Ecares $36 eath Babo BaIt 524r 77 WWnra 121 OedL $40 60 Voar Corsair FAU 525 63 C Seofacok F7C1 045 *05 vop Corsair P45 069 94 C Seahoack F7C1 057 70 Lack LoOm o P30 $30 100 Slicar 0-30 Anph $49 56 RepSca-Oee Ao $24 60 Boeng ISO Opo $36 74 RepSeaBee Arm 539 90 Roe no tOO Spot 70 Ploer J-3 Cab539 73 No th op Oooooo $40 156 Fleer J-3 Cok039r 96 No hoo Oarooa 575 9$ Loch Hodeon Otok $30 905rA Lao 3/M 556 63 Oii~t Hellcat $20 605~~A Loco 2/M $43 77 Ooeirn 0-170 Fort $35 120 SrinsA toac 3/M 103 Oee 8170 Fort $55 70 Co,notCatPBYSA $43 60 Wnstl Whirlccind 532 104 CooCatFOY-SA $56 60 N Arrer Nanic, $39 65 MChiro Clipper $65 60 OBonanca v-Tail $39 97 MChina Clipper $7577 Lacoarohe Sedam $25 62 Cortis NC-4$59 72 NA 8-25 Bornkr $49 94 Ccrtien NC-A $69 Sold Okra Sealer Prices schiecl charoe arose reins cetccnea Qc4C0e5 Sloe 51*00 FLat OaerlAOO Mare 55c Up 6l22 patre Alay IncI * Add 10% arders far shipping & ins era USA Can & Mec Elsecohere its 15% 120% airI Pictorial caralog $200 tinclades Price Listl Price list section elare $1 00 ky foreig add $100 CLEVELAND MODEL & SUPPLY Co 5siaa staro scwcsctacacflD*oictlOtls silt tsiEOC-5inO5 tsi niccOOisnsaOOcC 10307B DETROIT AVE CLEVELAND OHIO 44102 orsonecs.soeacsaors hone toO ISP MO ST SST112161 961-3600 rC0s-CacflaOOr 18 Model Aviation ASTRO FLIGHT SYSTEMS Challenger Cobalt 4 cell 020 Direct $ 7645 Challenger Cobalt 0 cell 030 Direct $ 8920 Challenger Cohag 7 cell 05 Direct $10621 ChallengerCobalt l2cell IS Direct $14020 Challenger Cobalt 14 cell 25 Direct $1 6570 Challerrger Cobalt 18 cell 40 Direct $19545 Challenger Cobalt 24 cell 60 Direct $29471 Astro DC/DC Super Charger up 2lt cells Astro AC/DC Charger current adjuot Astro DC/DC Charger Astro Electric Throttle Astro Do-DO Motor Control Electronic AQQBIaI Aedereon Power Pole Conoector 4 bausings / 4 pins Gold Pin Molee Connector Tamiya Connector Hi-Fino Wire 311 00 red & bloch 16 Gai240 Stranrt Daseys 30 Amp Meter t Micro SwOch Harneost 3/16 Flat Oraid br Soldering Saoeries Heat Shrink Tabing Baoeries 20 br 450AFl 000 & 1200SCR Flat Pachs 3 tOreSOAR Flat Pacho 4 br eSOAR & 1200SCR Stacked Packs t Geored $ 0771 Geored $11046 Geantd $12745 Geared $16140 Geared $18606 Geared 021671 5a206 $0500 $3200 $0096 $3196 $200 /yr $210 /pr $150 /pr $200 $1905 $460 $050 /11 $150 /5 $160/It $ieO /5 CELLS 4 Cell 450 mA $1950 0 Cell 450roA $2300 dOSAR $3SOea 6 Cell 900 mA $2920 7 Cell 800 mA $3315 OSOAR $3OSea 6 Cell 900 mA $2980 7 Cell 000 mA $33eS 9000CR $4OSea 6 Cell l200mA $2920 7 Cell l2000rA $3310 2005CR$3OSea A11 packs ant wired Ilat packs Pleane npecly desired connectors ELECTRIC POWER KITS MMC Ultra MK IV 89 Span Sailplane torSO Gear$3796 MMC ElectOc Playboy er Spas Old Timer br 05 Gear$2600 Astro Challenger 73 Span Sailplane tsr 05 Gear$3200 EMD Electra Glide II 73 Span Sailplane br 05$3100 EMD Thenoic Traveler Sailplane 76 Span bOO$3100 EMO Sky Knight 44 Span Trainertor 05$2400 EMD Ligntning 39 Span Aerobatic Sport Model 0002400 MMC Fast Eddie Aerobotic Sport Model br OS$2400 AQrrn Onn 07 S,, a,flrL- O,n 400 SHIPPING & HANDLING76 Page CATALOGUE Up $900 add $200$200 pp/tot Class free $001to $2000 add $200when requested order $2001 $4000 add $325 $4501 $7000 add 0375 Over $7000 add $450HOBBY HORN CA Addressees add 6% tao Send 3 Moron St [A] MO VISA/ MC 95 Eap Date oc 2212 Checkallow opts 30 days totWestminster Ca 52504 checkclearuece COD50001 charges plan $150 853-0311 handling Cash OnlyHrs Mon-Fri 5AM 5PM Flutter aviation world torsional vi bration wing vibration excited airflow over wing rule thumb used designers full-scale aircraft hove center-of-grovity wing entire airplone between leading edge wing ond 25% chord Flutter tail surfaces probably major problem because ore smaller got impression article vibration torsional bending control sur face defined flutter Control surface flut ter usually result poor assembly related what usually called wing flutter re gard failures experienced other modelers flutter may hove cause Without having details cannot give defi nite eauses other reasons failure 0 Undetected damage during handling Defective materials and/or assembly cture could withstand high control surface forces imposed during moneuvers ation combination above vibrations torsional bending combination two can caused airflow engines other sources Davids letter went discuss natural fre quency structures frequency will vibrate disturbed allowed vibrate freely included calculations probable natural frequencies models sta bilizer Despite fact Im also mechani cal engineer hard time following Davids calculations Im going include column bottom line appears flutter can induce stab failureor can develop just because structure insufficient Continued pctge 148 Hobby H0 January 1989 23 AIR WOLF EPOXY FIBERGLASS FUSELAGES TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $20000 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 Safety/Preston Continued page 23 strength carry G loads occur during flight maneuvers latter situation may have likely cause stab failure described another letter received former airline pilot Q hundred years 727s Charles Pyeatt Palos Verdes Estates CA Enclosed Chucks letter photograph see elsewhere column broken stabilizer 85-in-span Waco ARE tended powered Quadra Since Chuck intended use OS 120 four-stroke light ened structure shown plans result Chucks own words Doug 11-year-old grandson RC pi lot early flight made fttst pass moderate wide-open dive stab broke bang resulted violent flutter stopped Doug pulled power off have video watch over over awe model landed OK Im now beef ing stab full-scale ARE didnt have brace wires stab will probably use Before leaving subject Id like thank Jeff Combs Brian Coriley Bill Stodgell L Ar ata Sven Corsak also wrote de scribed in-flight stabilizer failures oc curred different models Sven sent portion vertical stab detached model Perhaps Ill have fu tare column Fire in-flight stab failure in-flight fire Under heading Crash & Bum De cember 1988 column related incident model caught fire after crash said isnt often hear such incident However September 1988 issue Ru Stuf newsletter Green Bay Ruf Club read what first time report inflight fire incident experienced club president Gary Doeren coeditor newsletter wife Sandy titled Big Birds Get Hot picture below see hazards flying large Scale birds gas engine instance muffler came loose flight During flight looked smoker found some residual fuel smoke tank actuality plane onboard fire fire burned hole firewall 5/16-in-thick aircraft ply burned foam around metal tanks melted solder tanks well worst thing about situation could see no ex ternal damage landed plane cowl ing felt little warm no smoke So left plane car overnight didnt dis cover damage until next morning took cowling off reattach muffler illustration firewall newsletter Xerox copy original photograph hence cannot reproduced successfully However can assure clearly showed big hole Safety book few weeks ago returned home work find UPS left package doorstep Upon opening package found spiral-bound book entitled Safety Comes First Frank Burchardt reader Carlsbad NM responsible work art will let letter accompanied book tell about happen people dis like throwing things away Safety vol ume result kind thinking Let ex plain About year ago faced another storage problem very large stack past sues various model magazines including Model Aviation made decision reduce cubic feet magazines cutting out past ing up looseleaf binding interesting plans articles etc Among articles Safety Comes First such valid con tent plan began form mind would use club meeting safety talks Ive safety-oriented person since early days Air Force electronics/nu clear technician natural proverbial gears turned Safety material took new format Now nine chapters categorized safety-related material hand feel work needs have exposure just own club members suggest RC club should have concise ca tegorized material ongoing safety program offered through AMA nominal fee yearly basis looseleaf form clubs Safety Officer would have some needed guidelines operate hope feel will way preserve fine Safety Comes First ar tides future hobbyists FMINI-ELECT RIC OUICKCHARGEQUIET INSTANTSTARTLOWOOST ERIES VL111 $2495 Includes HY-7t B6Props Charge cord andht Batteries Riqalres Connector Access spacers etc $1795VL-111R$2795$3t95 der 7 leads QuickSame VL-111 Remote Battery Holdery VL Flight Battery rt MotorTo subslilute Buf above add $3 00VL Field box 30 size models VL-192$3295$ 995 $1395Inclades HY-42 Motor tory SJ-5 Switch t2 feel engineCharge Plug Cordoctions 148 Model Aviation MINI POWER AT ITS BEST LIGHT WEIGHT MOlS PROPS HY-lO$1495 7 1 gear ratio hgage disengage Free Wheeling grams aicloded ecaps onto meter HY-70R Same HY-70 witl Disconnects Slide Ba ldY-7tasd HY-42 Improned version HY-48 Approry EFC-590 Low cost Quick Charge 4 D'type batteries r FC-492 Ideal Above charge FLIGHT BATTERIES B-52 HY7t 2 x 5t mA-Hr B-t3 HY7t 3o St mA-Hr B-33L IHY-42-Hr B-34L HY42 B-13t BI short Frank has done something have long thought doing myself never quite got around has taken nine years writ ings cutting pasting has organized chapters contains arti cles similar nature Quite monumental task opinion forwarded Franks book Bob Underwood AMAs Technical Director asked Bob would consider Franks suggestion make book available AMA clubs some means other Just last week received copy letter Bob Frank states AMA consider ing making available clubs members might wish have Its just pride author ship makes believe would worthwhile undertaking readers similar opinion suggest drop line contact Bob Underwood directly enough let ters phone calls express interest proj ect might help convince AMA HQ staff go ahead publication Please let us know thoughts Have another safe month Seagull/Byrum Continued page 33 edges using file straightedge Studs made threaded steel rod screwed tapped plywood se curely glued inside wings Multiple lam inations /8-in five-ply work better single piece thicker plywood Use sharp tap avoid splintering wood Sat urate finished plywood thin CyA harden Incidence can adjusted screwing studs out studs themselves drilled tapped screws hold cabane interplane struts Always use Loctite keep screws vibrating loose satisfied way Seagull flies epoxy studs place Once thing permanently place Seagull can assembled field 15 minutes tail wheel takes lot abuse model make tail wheel assembly capable taking punishment used piece %2 music wire anchored nose gear mount Having tried varieties hinges like large Du-Bro type best Notice hinge pockets plans Hinges should also pegged toothpicks Giant Scale models still being lost through use unsuitable hinges careful stabilizer rm elevator rudder built same manner Cut leading edges LE trailing edges TE dimensions shown plans Mark centerline LE TE ball-point pen Pin LE TE over plans using shims tips keep cen terlines parallel building board Ribs cut patterns shown plan also marked center line gluing ribs LE TE centerlines should course meet Sheet top side fin %2 balsa Turn fin over reshim before sheet other side stab spars added after ribs glued LE/TE stab sheeted 6 balsa As fin stab turned over reshimmed other set spars added A6 sheeting glued rudder elevator ribs simple pieces 1/8 x 1-in balsa tapered meet TE Both rudder elevator built directly over plans After construction covered fabric per fullsize Seagull recommend using servo per elevator handle loads case no need join two elevator halves avoid adverse yaw ailerons need about 20/80 differential down-to-up throw right aileron goes up 200 left aileron should go down So didnt build enough differential model initially able obtain electronically adjusting settings Futaba 8FGA radio plans show arrangement should give increased mechanical differen tial over original scheme used course two servos used ailerons top bottom ailerons linked together tie rod done full-scale plane found necessary clude external static balances aile rons prototype large canopy usual focal point model case January 1989 149
Edition: Model Aviation - 1989/01
Page Numbers: 14, 16, 18, 23, 148, 149
John Preston Sfety812Corn Phit Nordiuupton St NW Washington DC column pmvided address Items concern regarding safety aspects model aviation actMties Content column howeveu opinion author does necessadly represent offidal position Academy Model Aemnautics Watch out Some CyA glue debonders contain acetonitrile can cause cyanide poisoning drink enough stab structural failures model fires WARNING has recently come attention some brands cyanoacrylate glue debond ers contain acetonitrile ingested suffi cient quantity can cause cyanide poisoning Acetonitrile also known methyl cyanide also sold removal glue used tach false fingernails am aware two incidents young children ingested acetonitrile sold application under brand name Supernail Liquid Nail Off incidents 16-month-old boy reported have ingested two tablespoons liquid dose proved fatal autopsy report listed cause death cya nide intoxication other incident two-year-old child lieved have ingested much ounce Supemail Liquid Nail Off However after under going severe metabolic acidosis child recov ered because immediate treatment cyanide poi soning administered Debonders sold hobby use generally packaged eyedropper-type bottle such bottle believe would unlikely child would ingest lethal amount contents am told false fingernail debonder re sponsible fatality packaged such bottle conversation chemist Du Pont learned company used sole domestic producer acetonitrile af ter learning fatality company ceased its production substance However appears acetonitrile still produced abroad fore may still active ingredient some de bonders understand debonders sold under Sat ellite City Hot Stuff Sig labels con tain acetonitrile products other manu facturers may also free Nevertheless have children house suggest check work area make sure glues solvents other potentially harmful products safely out reach curious tod dlers record June 1988 American As sociation Poison Control Centers Inc peti tioned US Consumer Product Safety Com mission CPSC require products contain ing acetonitrile sold containers child-resistant caps Whether CPSC will re stab failures discussion inflight failure stabilizer kit-built model October 1988 Safety column resulted quite spate letters subjectnot complimentaly ItI 1TER lNc E IN NAVE oN-&Ai flE odel Aviation Did Waco ARES stab tail becuase flutter Theres subject column spond affirmatively petition remains letter Steve Jacobs postmarked seenKansas City MO contained no return ad dress Steve alleges am chicken s ecause did identili name manufac turer model allegedly involved three incidents stabilizer broke off flight Steve also suggested name Continued page 16 4 IJr%E YA COULJ column changed Advertisers Come First ended letter saying en joys column though doesnt respect Because readers MA AMA mem bers called AMA HQ attempted get address Steve order respond re marks letter However AMA membership roster contains no Steve Jacobs Kansas City its immediate vicinity Therefore Steve reading months column response wrote could mail September 6 1988 follows Dear Steve Perhaps eyes am chicken s ter reader alleging prod uct potentially unsafe opinion suf ficient grounds name brand product Safety column example am assume model ers built aircraft experienced stab failures competent builders could induced failures some less-thansatisfactory building technique past experi ence model question does have inade quate strength its stab would have expected additional reports result article October column did get number letters subject stab failure involved same model dont know long have reading Safety Comes First column have occasions did publish brand name product proof safety problem Remember beat guns asbestos liners Conversely have number times Ive received letters manufactur Continued page 18 'TR260 Freud Aerebulfc Duipm 1/4 Stand-off Scale Kit Span85in Length .. 66 Wingareal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdU $21500 plug whipping $1100 EvarIhIng k watch kit aS nwait wood putt hacoenpieta modal z DELUXE Kit $28500 plus shipping $1100 Leseythiag laS kit hat wing hewn lastaSad wimp stAb tiatla jack hatch Ike pra-akkeud IllS helm MAKES BUIWNI GUICKI A1 wood & foam constructIon Flherglas cowl & pants 2-plece plug-In wings * core airfolled till surfaces INs tail brace wires reqwred FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 Hill Ave Spirit Lake IA 51360 16 Model Aviation q r r -r - r -r- r . - .....eeeeeeo~oeoOooOO@SO6OOSOOOOOOSOSOOOOO .g... 0 0 0 0 fiaeF4 V fV&IV&U7Lfr~VUk4YW0 0 0 0 0 0 0 &~oh144 0 0 0 0 WE WILL CONTINUE TO GIVE 00 PERSONAL SERVICE AND ADVICE ON ANY OF 00 YOUR MODEL PROBLEMS 00 US YOU ARE MODELER NOT NUMBER 0S Now Have Weekly Phone Specials 00 Plus Combos Newcomer 0 00 00 0 Shipping & Handling 5395 COO Add $295 Money Order Only1-800-234-0180 Availabilitv Specifications & Prices Subject change Without Prior Notice ATALOG No service charge Credit Card Orders Personal Checks Mail Orders may held 15 days bank clearanceAfl1afOAMT 00 GUARANTEES & WARRANTIES ON DEFECTIVE MISSING ORTEXAS 101fl1 BROKENITEMSAREHANDLESOIRECTLYBYTHEMANUFACTURERSI~IA MAR ILLO ua _____ 00 @0 00000000 S000000600000 . 0eeS .0000000000000000000 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 RO 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 iIj SerIdellif $10300 plus shipgllng $1100 Cowl putt campy laidag par ie learn cams tar *15 laS aestaces bela deck S hatch 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 standa d fo IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS DeHAVILLAND BEAVER STi TS PLAYBOY 1/3 SCALE 88 $14000 FAIRCHILD 24OHUN UIH AU WARNER SCALE 80 1/5 SCALE 90 13995 $18475 96$17500TAYLORCRAFT90$15595 10717600PORTERFIELD COLLEGIATE8414595 8418750FAIRCHILD24RANGER9021000 466295PORTERFIELD FLY-ABOUT8013750 9618750WACO MODEL 1073419000 WACO TAPER WING72718000 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 ers alleged said something derogatory about products though men tioned name Copies two such letters enclosed sue-happy society would foolish editor publish allegation prod uct unsafe unless accompanied substan dated evidence truly case would foolish unless editor enjoys going court defendant libel suits rec ord manufacturer kit question does advertise Model Aviation Im pick ing up suggestion rename col umn Advertisers Come First Im glad enjoy Safety column hope letter restores respect writings Sincerely John Preston Another letter subject stab failure report came David Hall Carlsbad CA David mechanical engineer related cident sons first RC model suffered in-flight wing failure being flown experienced modeler As result plane engine destroyed failure appeared result insufficient strength models styrofoam wing letter manufac turer identified Steve resulted stronger wing replacement engine Davids letter responded request formation predict whether particular design will subject in-flight flutter following offer article asked suggestions predict whether particular design prone flutter Before begin let us define what mean flutter Continued page 23 MA 1009 Q44 04 dW N KN A-J CLASSIC 3-PAK. o A-J HORNET o 404 INTERCEPTOR5 99 o 74 GLIDER ready fly Note Please add $300 postage handling 000013 packaged modem Add 10% pose additional 0000 0000000000 0000000000 AI IRCRAFT COMPANY ROBox 68132 PORTLAND OR 97268 REAL SCALE MODELING FOR GIANT SCALE BUFFS * 87 Cart Jt44 Jenny$37 t63M Maroode 0 26 $d9 7 Ftr $39j01 OH Mosqaita Bk $42 00 en-Bee $33d 150 OH Maaqceornk $55 Fete Races32190 Otear PTt7Kaydet $56 i,e 060$24 99 Nolk Widaco Fdl 969 0kB$35 71 Soon SC-S 1C471 $35 ack P60$d2 95 Oocg SC-3 1C471 555 94 Cart Honk P60$Sdn Od Hacoks Tocaca 13 $32 a74 Soalittles 00 11$40 64 Stac Sky-Car 510 ~"asc 95 Manocoape Sport 036 72 CarOSUt /4 L&S $dd aj05 Hall Spr Bcltdoo $4 100 co 5201 /4 LAS $56 3 107 Aeroc0 C-S Sc 53560 Socalo M-3 Mail $34 62 Hocoard Raco Ike $45160 Oristal Ocllco0 Ftr 030 70 Tame, W-W Rac $35159 Brooneace MeLA ar Oahk Ft tC 0421107 Oraro Beoct FOF $54 14 Cc CoshO ri rc $54j 69 Lindhern NX-21 1 $30 16 DeHac Ca,et Raa $24 191 Licdhergs NO 211 539 12 HoacMrMcllinao S3196W NW 1 Nov Rac 540 14 HaocMMctligen Sd Farch PT 19 Tr 559 53 Bocino F-36A Fr 036 60 Waco Taper Wng $36 04 Baeio P-26A Fr $40 90 Woco Tap Wino $40 59 Waco C-O Cakin 536 75 Weert d Lysander $32 04 Beech C17-9 Stag $30 105 WestI dLyander 549 *7 96 Reonk C17-0 Stag $49 57 Ford Tcntr 4 AT 036 *....ains.A 55 Lock Elnatra $30176 Ford Trirntt 4-AT 540 02 Lack 11 Electra $40 ltd Ford Trintr dAT 565 in...5S62Srnaarr T/W 087 510196 Bellonce Airarcie $40 Stinean T/W S87 926193 Loerino C-3Anph $69 132 Srnan 0/W 00753 50 Orco J3-F Dccli $39 59 Bristol Ftr P3-B $2O~ 70 Ororo JTF Sack $56 110 Brlsrol Frr F2OB $4 124 Lock Alr Eapress $40 Tamer Fesca $4 63 Lock Air Bopress $24 36 Cv Werlrk F-dc $24 03 Lock Air Ecares $36 eath Babo BaIt 524r 77 WWnra 121 OedL $40 60 Voar Corsair FAU 525 63 C Seofacok F7C1 045 *05 vop Corsair P45 069 94 C Seahoack F7C1 057 70 Lack LoOm o P30 $30 100 Slicar 0-30 Anph $49 56 RepSca-Oee Ao $24 60 Boeng ISO Opo $36 74 RepSeaBee Arm 539 90 Roe no tOO Spot 70 Ploer J-3 Cab539 73 No th op Oooooo $40 156 Fleer J-3 Cok039r 96 No hoo Oarooa 575 9$ Loch Hodeon Otok $30 905rA Lao 3/M 556 63 Oii~t Hellcat $20 605~~A Loco 2/M $43 77 Ooeirn 0-170 Fort $35 120 SrinsA toac 3/M 103 Oee 8170 Fort $55 70 Co,notCatPBYSA $43 60 Wnstl Whirlccind 532 104 CooCatFOY-SA $56 60 N Arrer Nanic, $39 65 MChiro Clipper $65 60 OBonanca v-Tail $39 97 MChina Clipper $7577 Lacoarohe Sedam $25 62 Cortis NC-4$59 72 NA 8-25 Bornkr $49 94 Ccrtien NC-A $69 Sold Okra Sealer Prices schiecl charoe arose reins cetccnea Qc4C0e5 Sloe 51*00 FLat OaerlAOO Mare 55c Up 6l22 patre Alay IncI * Add 10% arders far shipping & ins era USA Can & Mec Elsecohere its 15% 120% airI Pictorial caralog $200 tinclades Price Listl Price list section elare $1 00 ky foreig add $100 CLEVELAND MODEL & SUPPLY Co 5siaa staro scwcsctacacflD*oictlOtls silt tsiEOC-5inO5 tsi niccOOisnsaOOcC 10307B DETROIT AVE CLEVELAND OHIO 44102 orsonecs.soeacsaors hone toO ISP MO ST SST112161 961-3600 rC0s-CacflaOOr 18 Model Aviation ASTRO FLIGHT SYSTEMS Challenger Cobalt 4 cell 020 Direct $ 7645 Challenger Cobalt 0 cell 030 Direct $ 8920 Challenger Cohag 7 cell 05 Direct $10621 ChallengerCobalt l2cell IS Direct $14020 Challenger Cobalt 14 cell 25 Direct $1 6570 Challerrger Cobalt 18 cell 40 Direct $19545 Challenger Cobalt 24 cell 60 Direct $29471 Astro DC/DC Super Charger up 2lt cells Astro AC/DC Charger current adjuot Astro DC/DC Charger Astro Electric Throttle Astro Do-DO Motor Control Electronic AQQBIaI Aedereon Power Pole Conoector 4 bausings / 4 pins Gold Pin Molee Connector Tamiya Connector Hi-Fino Wire 311 00 red & bloch 16 Gai240 Stranrt Daseys 30 Amp Meter t Micro SwOch Harneost 3/16 Flat Oraid br Soldering Saoeries Heat Shrink Tabing Baoeries 20 br 450AFl 000 & 1200SCR Flat Pachs 3 tOreSOAR Flat Pacho 4 br eSOAR & 1200SCR Stacked Packs t Geored $ 0771 Geored $11046 Geantd $12745 Geared $16140 Geared $18606 Geared 021671 5a206 $0500 $3200 $0096 $3196 $200 /yr $210 /pr $150 /pr $200 $1905 $460 $050 /11 $150 /5 $160/It $ieO /5 CELLS 4 Cell 450 mA $1950 0 Cell 450roA $2300 dOSAR $3SOea 6 Cell 900 mA $2920 7 Cell 800 mA $3315 OSOAR $3OSea 6 Cell 900 mA $2980 7 Cell 000 mA $33eS 9000CR $4OSea 6 Cell l200mA $2920 7 Cell l2000rA $3310 2005CR$3OSea A11 packs ant wired Ilat packs Pleane npecly desired connectors ELECTRIC POWER KITS MMC Ultra MK IV 89 Span Sailplane torSO Gear$3796 MMC ElectOc Playboy er Spas Old Timer br 05 Gear$2600 Astro Challenger 73 Span Sailplane tsr 05 Gear$3200 EMD Electra Glide II 73 Span Sailplane br 05$3100 EMD Thenoic Traveler Sailplane 76 Span bOO$3100 EMO Sky Knight 44 Span Trainertor 05$2400 EMD Ligntning 39 Span Aerobatic Sport Model 0002400 MMC Fast Eddie Aerobotic Sport Model br OS$2400 AQrrn Onn 07 S,, a,flrL- O,n 400 SHIPPING & HANDLING76 Page CATALOGUE Up $900 add $200$200 pp/tot Class free $001to $2000 add $200when requested order $2001 $4000 add $325 $4501 $7000 add 0375 Over $7000 add $450HOBBY HORN CA Addressees add 6% tao Send 3 Moron St [A] MO VISA/ MC 95 Eap Date oc 2212 Checkallow opts 30 days totWestminster Ca 52504 checkclearuece COD50001 charges plan $150 853-0311 handling Cash OnlyHrs Mon-Fri 5AM 5PM Flutter aviation world torsional vi bration wing vibration excited airflow over wing rule thumb used designers full-scale aircraft hove center-of-grovity wing entire airplone between leading edge wing ond 25% chord Flutter tail surfaces probably major problem because ore smaller got impression article vibration torsional bending control sur face defined flutter Control surface flut ter usually result poor assembly related what usually called wing flutter re gard failures experienced other modelers flutter may hove cause Without having details cannot give defi nite eauses other reasons failure 0 Undetected damage during handling Defective materials and/or assembly cture could withstand high control surface forces imposed during moneuvers ation combination above vibrations torsional bending combination two can caused airflow engines other sources Davids letter went discuss natural fre quency structures frequency will vibrate disturbed allowed vibrate freely included calculations probable natural frequencies models sta bilizer Despite fact Im also mechani cal engineer hard time following Davids calculations Im going include column bottom line appears flutter can induce stab failureor can develop just because structure insufficient Continued pctge 148 Hobby H0 January 1989 23 AIR WOLF EPOXY FIBERGLASS FUSELAGES TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $20000 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 Safety/Preston Continued page 23 strength carry G loads occur during flight maneuvers latter situation may have likely cause stab failure described another letter received former airline pilot Q hundred years 727s Charles Pyeatt Palos Verdes Estates CA Enclosed Chucks letter photograph see elsewhere column broken stabilizer 85-in-span Waco ARE tended powered Quadra Since Chuck intended use OS 120 four-stroke light ened structure shown plans result Chucks own words Doug 11-year-old grandson RC pi lot early flight made fttst pass moderate wide-open dive stab broke bang resulted violent flutter stopped Doug pulled power off have video watch over over awe model landed OK Im now beef ing stab full-scale ARE didnt have brace wires stab will probably use Before leaving subject Id like thank Jeff Combs Brian Coriley Bill Stodgell L Ar ata Sven Corsak also wrote de scribed in-flight stabilizer failures oc curred different models Sven sent portion vertical stab detached model Perhaps Ill have fu tare column Fire in-flight stab failure in-flight fire Under heading Crash & Bum De cember 1988 column related incident model caught fire after crash said isnt often hear such incident However September 1988 issue Ru Stuf newsletter Green Bay Ruf Club read what first time report inflight fire incident experienced club president Gary Doeren coeditor newsletter wife Sandy titled Big Birds Get Hot picture below see hazards flying large Scale birds gas engine instance muffler came loose flight During flight looked smoker found some residual fuel smoke tank actuality plane onboard fire fire burned hole firewall 5/16-in-thick aircraft ply burned foam around metal tanks melted solder tanks well worst thing about situation could see no ex ternal damage landed plane cowl ing felt little warm no smoke So left plane car overnight didnt dis cover damage until next morning took cowling off reattach muffler illustration firewall newsletter Xerox copy original photograph hence cannot reproduced successfully However can assure clearly showed big hole Safety book few weeks ago returned home work find UPS left package doorstep Upon opening package found spiral-bound book entitled Safety Comes First Frank Burchardt reader Carlsbad NM responsible work art will let letter accompanied book tell about happen people dis like throwing things away Safety vol ume result kind thinking Let ex plain About year ago faced another storage problem very large stack past sues various model magazines including Model Aviation made decision reduce cubic feet magazines cutting out past ing up looseleaf binding interesting plans articles etc Among articles Safety Comes First such valid con tent plan began form mind would use club meeting safety talks Ive safety-oriented person since early days Air Force electronics/nu clear technician natural proverbial gears turned Safety material took new format Now nine chapters categorized safety-related material hand feel work needs have exposure just own club members suggest RC club should have concise ca tegorized material ongoing safety program offered through AMA nominal fee yearly basis looseleaf form clubs Safety Officer would have some needed guidelines operate hope feel will way preserve fine Safety Comes First ar tides future hobbyists FMINI-ELECT RIC OUICKCHARGEQUIET INSTANTSTARTLOWOOST ERIES VL111 $2495 Includes HY-7t B6Props Charge cord andht Batteries Riqalres Connector Access spacers etc $1795VL-111R$2795$3t95 der 7 leads QuickSame VL-111 Remote Battery Holdery VL Flight Battery rt MotorTo subslilute Buf above add $3 00VL Field box 30 size models VL-192$3295$ 995 $1395Inclades HY-42 Motor tory SJ-5 Switch t2 feel engineCharge Plug Cordoctions 148 Model Aviation MINI POWER AT ITS BEST LIGHT WEIGHT MOlS PROPS HY-lO$1495 7 1 gear ratio hgage disengage Free Wheeling grams aicloded ecaps onto meter HY-70R Same HY-70 witl Disconnects Slide Ba ldY-7tasd HY-42 Improned version HY-48 Approry EFC-590 Low cost Quick Charge 4 D'type batteries r FC-492 Ideal Above charge FLIGHT BATTERIES B-52 HY7t 2 x 5t mA-Hr B-t3 HY7t 3o St mA-Hr B-33L IHY-42-Hr B-34L HY42 B-13t BI short Frank has done something have long thought doing myself never quite got around has taken nine years writ ings cutting pasting has organized chapters contains arti cles similar nature Quite monumental task opinion forwarded Franks book Bob Underwood AMAs Technical Director asked Bob would consider Franks suggestion make book available AMA clubs some means other Just last week received copy letter Bob Frank states AMA consider ing making available clubs members might wish have Its just pride author ship makes believe would worthwhile undertaking readers similar opinion suggest drop line contact Bob Underwood directly enough let ters phone calls express interest proj ect might help convince AMA HQ staff go ahead publication Please let us know thoughts Have another safe month Seagull/Byrum Continued page 33 edges using file straightedge Studs made threaded steel rod screwed tapped plywood se curely glued inside wings Multiple lam inations /8-in five-ply work better single piece thicker plywood Use sharp tap avoid splintering wood Sat urate finished plywood thin CyA harden Incidence can adjusted screwing studs out studs themselves drilled tapped screws hold cabane interplane struts Always use Loctite keep screws vibrating loose satisfied way Seagull flies epoxy studs place Once thing permanently place Seagull can assembled field 15 minutes tail wheel takes lot abuse model make tail wheel assembly capable taking punishment used piece %2 music wire anchored nose gear mount Having tried varieties hinges like large Du-Bro type best Notice hinge pockets plans Hinges should also pegged toothpicks Giant Scale models still being lost through use unsuitable hinges careful stabilizer rm elevator rudder built same manner Cut leading edges LE trailing edges TE dimensions shown plans Mark centerline LE TE ball-point pen Pin LE TE over plans using shims tips keep cen terlines parallel building board Ribs cut patterns shown plan also marked center line gluing ribs LE TE centerlines should course meet Sheet top side fin %2 balsa Turn fin over reshim before sheet other side stab spars added after ribs glued LE/TE stab sheeted 6 balsa As fin stab turned over reshimmed other set spars added A6 sheeting glued rudder elevator ribs simple pieces 1/8 x 1-in balsa tapered meet TE Both rudder elevator built directly over plans After construction covered fabric per fullsize Seagull recommend using servo per elevator handle loads case no need join two elevator halves avoid adverse yaw ailerons need about 20/80 differential down-to-up throw right aileron goes up 200 left aileron should go down So didnt build enough differential model initially able obtain electronically adjusting settings Futaba 8FGA radio plans show arrangement should give increased mechanical differen tial over original scheme used course two servos used ailerons top bottom ailerons linked together tie rod done full-scale plane found necessary clude external static balances aile rons prototype large canopy usual focal point model case January 1989 149
Edition: Model Aviation - 1989/01
Page Numbers: 14, 16, 18, 23, 148, 149
John Preston Sfety812Corn Phit Nordiuupton St NW Washington DC column pmvided address Items concern regarding safety aspects model aviation actMties Content column howeveu opinion author does necessadly represent offidal position Academy Model Aemnautics Watch out Some CyA glue debonders contain acetonitrile can cause cyanide poisoning drink enough stab structural failures model fires WARNING has recently come attention some brands cyanoacrylate glue debond ers contain acetonitrile ingested suffi cient quantity can cause cyanide poisoning Acetonitrile also known methyl cyanide also sold removal glue used tach false fingernails am aware two incidents young children ingested acetonitrile sold application under brand name Supernail Liquid Nail Off incidents 16-month-old boy reported have ingested two tablespoons liquid dose proved fatal autopsy report listed cause death cya nide intoxication other incident two-year-old child lieved have ingested much ounce Supemail Liquid Nail Off However after under going severe metabolic acidosis child recov ered because immediate treatment cyanide poi soning administered Debonders sold hobby use generally packaged eyedropper-type bottle such bottle believe would unlikely child would ingest lethal amount contents am told false fingernail debonder re sponsible fatality packaged such bottle conversation chemist Du Pont learned company used sole domestic producer acetonitrile af ter learning fatality company ceased its production substance However appears acetonitrile still produced abroad fore may still active ingredient some de bonders understand debonders sold under Sat ellite City Hot Stuff Sig labels con tain acetonitrile products other manu facturers may also free Nevertheless have children house suggest check work area make sure glues solvents other potentially harmful products safely out reach curious tod dlers record June 1988 American As sociation Poison Control Centers Inc peti tioned US Consumer Product Safety Com mission CPSC require products contain ing acetonitrile sold containers child-resistant caps Whether CPSC will re stab failures discussion inflight failure stabilizer kit-built model October 1988 Safety column resulted quite spate letters subjectnot complimentaly ItI 1TER lNc E IN NAVE oN-&Ai flE odel Aviation Did Waco ARES stab tail becuase flutter Theres subject column spond affirmatively petition remains letter Steve Jacobs postmarked seenKansas City MO contained no return ad dress Steve alleges am chicken s ecause did identili name manufac turer model allegedly involved three incidents stabilizer broke off flight Steve also suggested name Continued page 16 4 IJr%E YA COULJ column changed Advertisers Come First ended letter saying en joys column though doesnt respect Because readers MA AMA mem bers called AMA HQ attempted get address Steve order respond re marks letter However AMA membership roster contains no Steve Jacobs Kansas City its immediate vicinity Therefore Steve reading months column response wrote could mail September 6 1988 follows Dear Steve Perhaps eyes am chicken s ter reader alleging prod uct potentially unsafe opinion suf ficient grounds name brand product Safety column example am assume model ers built aircraft experienced stab failures competent builders could induced failures some less-thansatisfactory building technique past experi ence model question does have inade quate strength its stab would have expected additional reports result article October column did get number letters subject stab failure involved same model dont know long have reading Safety Comes First column have occasions did publish brand name product proof safety problem Remember beat guns asbestos liners Conversely have number times Ive received letters manufactur Continued page 18 'TR260 Freud Aerebulfc Duipm 1/4 Stand-off Scale Kit Span85in Length .. 66 Wingareal2l3 sq Weight.. 165 lbs Power035-040 G38-G62 FdU $21500 plug whipping $1100 EvarIhIng k watch kit aS nwait wood putt hacoenpieta modal z DELUXE Kit $28500 plus shipping $1100 Leseythiag laS kit hat wing hewn lastaSad wimp stAb tiatla jack hatch Ike pra-akkeud IllS helm MAKES BUIWNI GUICKI A1 wood & foam constructIon Flherglas cowl & pants 2-plece plug-In wings * core airfolled till surfaces INs tail brace wires reqwred FOR MORE INFO OR TO PLACE ORDER CONTACT SPIRIT LAKE HOBBIES Ph 712 336-5586 1621 Hill Ave Spirit Lake IA 51360 16 Model Aviation q r r -r - r -r- r . - .....eeeeeeo~oeoOooOO@SO6OOSOOOOOOSOSOOOOO .g... 0 0 0 0 fiaeF4 V fV&IV&U7Lfr~VUk4YW0 0 0 0 0 0 0 &~oh144 0 0 0 0 WE WILL CONTINUE TO GIVE 00 PERSONAL SERVICE AND ADVICE ON ANY OF 00 YOUR MODEL PROBLEMS 00 US YOU ARE MODELER NOT NUMBER 0S Now Have Weekly Phone Specials 00 Plus Combos Newcomer 0 00 00 0 Shipping & Handling 5395 COO Add $295 Money Order Only1-800-234-0180 Availabilitv Specifications & Prices Subject change Without Prior Notice ATALOG No service charge Credit Card Orders Personal Checks Mail Orders may held 15 days bank clearanceAfl1afOAMT 00 GUARANTEES & WARRANTIES ON DEFECTIVE MISSING ORTEXAS 101fl1 BROKENITEMSAREHANDLESOIRECTLYBYTHEMANUFACTURERSI~IA MAR ILLO ua _____ 00 @0 00000000 S000000600000 . 0eeS .0000000000000000000 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 RO 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 iIj SerIdellif $10300 plus shipgllng $1100 Cowl putt campy laidag par ie learn cams tar *15 laS aestaces bela deck S hatch 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 standa d fo IKON MONOCOUPE 90A SUPER CUB GREAT LAKES 2T-1A EDO FLOATS DeHAVILLAND BEAVER STi TS PLAYBOY 1/3 SCALE 88 $14000 FAIRCHILD 24OHUN UIH AU WARNER SCALE 80 1/5 SCALE 90 13995 $18475 96$17500TAYLORCRAFT90$15595 10717600PORTERFIELD COLLEGIATE8414595 8418750FAIRCHILD24RANGER9021000 466295PORTERFIELD FLY-ABOUT8013750 9618750WACO MODEL 1073419000 WACO TAPER WING72718000 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 ers alleged said something derogatory about products though men tioned name Copies two such letters enclosed sue-happy society would foolish editor publish allegation prod uct unsafe unless accompanied substan dated evidence truly case would foolish unless editor enjoys going court defendant libel suits rec ord manufacturer kit question does advertise Model Aviation Im pick ing up suggestion rename col umn Advertisers Come First Im glad enjoy Safety column hope letter restores respect writings Sincerely John Preston Another letter subject stab failure report came David Hall Carlsbad CA David mechanical engineer related cident sons first RC model suffered in-flight wing failure being flown experienced modeler As result plane engine destroyed failure appeared result insufficient strength models styrofoam wing letter manufac turer identified Steve resulted stronger wing replacement engine Davids letter responded request formation predict whether particular design will subject in-flight flutter following offer article asked suggestions predict whether particular design prone flutter Before begin let us define what mean flutter Continued page 23 MA 1009 Q44 04 dW N KN A-J CLASSIC 3-PAK. o A-J HORNET o 404 INTERCEPTOR5 99 o 74 GLIDER ready fly Note Please add $300 postage handling 000013 packaged modem Add 10% pose additional 0000 0000000000 0000000000 AI IRCRAFT COMPANY ROBox 68132 PORTLAND OR 97268 REAL SCALE MODELING FOR GIANT SCALE BUFFS * 87 Cart Jt44 Jenny$37 t63M Maroode 0 26 $d9 7 Ftr $39j01 OH Mosqaita Bk $42 00 en-Bee $33d 150 OH Maaqceornk $55 Fete Races32190 Otear PTt7Kaydet $56 i,e 060$24 99 Nolk Widaco Fdl 969 0kB$35 71 Soon SC-S 1C471 $35 ack P60$d2 95 Oocg SC-3 1C471 555 94 Cart Honk P60$Sdn Od Hacoks Tocaca 13 $32 a74 Soalittles 00 11$40 64 Stac Sky-Car 510 ~"asc 95 Manocoape Sport 036 72 CarOSUt /4 L&S $dd aj05 Hall Spr Bcltdoo $4 100 co 5201 /4 LAS $56 3 107 Aeroc0 C-S Sc 53560 Socalo M-3 Mail $34 62 Hocoard Raco Ike $45160 Oristal Ocllco0 Ftr 030 70 Tame, W-W Rac $35159 Brooneace MeLA ar Oahk Ft tC 0421107 Oraro Beoct FOF $54 14 Cc CoshO ri rc $54j 69 Lindhern NX-21 1 $30 16 DeHac Ca,et Raa $24 191 Licdhergs NO 211 539 12 HoacMrMcllinao S3196W NW 1 Nov Rac 540 14 HaocMMctligen Sd Farch PT 19 Tr 559 53 Bocino F-36A Fr 036 60 Waco Taper Wng $36 04 Baeio P-26A Fr $40 90 Woco Tap Wino $40 59 Waco C-O Cakin 536 75 Weert d Lysander $32 04 Beech C17-9 Stag $30 105 WestI dLyander 549 *7 96 Reonk C17-0 Stag $49 57 Ford Tcntr 4 AT 036 *....ains.A 55 Lock Elnatra $30176 Ford Trirntt 4-AT 540 02 Lack 11 Electra $40 ltd Ford Trintr dAT 565 in...5S62Srnaarr T/W 087 510196 Bellonce Airarcie $40 Stinean T/W S87 926193 Loerino C-3Anph $69 132 Srnan 0/W 00753 50 Orco J3-F Dccli $39 59 Bristol Ftr P3-B $2O~ 70 Ororo JTF Sack $56 110 Brlsrol Frr F2OB $4 124 Lock Alr Eapress $40 Tamer Fesca $4 63 Lock Air Bopress $24 36 Cv Werlrk F-dc $24 03 Lock Air Ecares $36 eath Babo BaIt 524r 77 WWnra 121 OedL $40 60 Voar Corsair FAU 525 63 C Seofacok F7C1 045 *05 vop Corsair P45 069 94 C Seahoack F7C1 057 70 Lack LoOm o P30 $30 100 Slicar 0-30 Anph $49 56 RepSca-Oee Ao $24 60 Boeng ISO Opo $36 74 RepSeaBee Arm 539 90 Roe no tOO Spot 70 Ploer J-3 Cab539 73 No th op Oooooo $40 156 Fleer J-3 Cok039r 96 No hoo Oarooa 575 9$ Loch Hodeon Otok $30 905rA Lao 3/M 556 63 Oii~t Hellcat $20 605~~A Loco 2/M $43 77 Ooeirn 0-170 Fort $35 120 SrinsA toac 3/M 103 Oee 8170 Fort $55 70 Co,notCatPBYSA $43 60 Wnstl Whirlccind 532 104 CooCatFOY-SA $56 60 N Arrer Nanic, $39 65 MChiro Clipper $65 60 OBonanca v-Tail $39 97 MChina Clipper $7577 Lacoarohe Sedam $25 62 Cortis NC-4$59 72 NA 8-25 Bornkr $49 94 Ccrtien NC-A $69 Sold Okra Sealer Prices schiecl charoe arose reins cetccnea Qc4C0e5 Sloe 51*00 FLat OaerlAOO Mare 55c Up 6l22 patre Alay IncI * Add 10% arders far shipping & ins era USA Can & Mec Elsecohere its 15% 120% airI Pictorial caralog $200 tinclades Price Listl Price list section elare $1 00 ky foreig add $100 CLEVELAND MODEL & SUPPLY Co 5siaa staro scwcsctacacflD*oictlOtls silt tsiEOC-5inO5 tsi niccOOisnsaOOcC 10307B DETROIT AVE CLEVELAND OHIO 44102 orsonecs.soeacsaors hone toO ISP MO ST SST112161 961-3600 rC0s-CacflaOOr 18 Model Aviation ASTRO FLIGHT SYSTEMS Challenger Cobalt 4 cell 020 Direct $ 7645 Challenger Cobalt 0 cell 030 Direct $ 8920 Challenger Cohag 7 cell 05 Direct $10621 ChallengerCobalt l2cell IS Direct $14020 Challenger Cobalt 14 cell 25 Direct $1 6570 Challerrger Cobalt 18 cell 40 Direct $19545 Challenger Cobalt 24 cell 60 Direct $29471 Astro DC/DC Super Charger up 2lt cells Astro AC/DC Charger current adjuot Astro DC/DC Charger Astro Electric Throttle Astro Do-DO Motor Control Electronic AQQBIaI Aedereon Power Pole Conoector 4 bausings / 4 pins Gold Pin Molee Connector Tamiya Connector Hi-Fino Wire 311 00 red & bloch 16 Gai240 Stranrt Daseys 30 Amp Meter t Micro SwOch Harneost 3/16 Flat Oraid br Soldering Saoeries Heat Shrink Tabing Baoeries 20 br 450AFl 000 & 1200SCR Flat Pachs 3 tOreSOAR Flat Pacho 4 br eSOAR & 1200SCR Stacked Packs t Geored $ 0771 Geored $11046 Geantd $12745 Geared $16140 Geared $18606 Geared 021671 5a206 $0500 $3200 $0096 $3196 $200 /yr $210 /pr $150 /pr $200 $1905 $460 $050 /11 $150 /5 $160/It $ieO /5 CELLS 4 Cell 450 mA $1950 0 Cell 450roA $2300 dOSAR $3SOea 6 Cell 900 mA $2920 7 Cell 800 mA $3315 OSOAR $3OSea 6 Cell 900 mA $2980 7 Cell 000 mA $33eS 9000CR $4OSea 6 Cell l200mA $2920 7 Cell l2000rA $3310 2005CR$3OSea A11 packs ant wired Ilat packs Pleane npecly desired connectors ELECTRIC POWER KITS MMC Ultra MK IV 89 Span Sailplane torSO Gear$3796 MMC ElectOc Playboy er Spas Old Timer br 05 Gear$2600 Astro Challenger 73 Span Sailplane tsr 05 Gear$3200 EMD Electra Glide II 73 Span Sailplane br 05$3100 EMD Thenoic Traveler Sailplane 76 Span bOO$3100 EMO Sky Knight 44 Span Trainertor 05$2400 EMD Ligntning 39 Span Aerobatic Sport Model 0002400 MMC Fast Eddie Aerobotic Sport Model br OS$2400 AQrrn Onn 07 S,, a,flrL- O,n 400 SHIPPING & HANDLING76 Page CATALOGUE Up $900 add $200$200 pp/tot Class free $001to $2000 add $200when requested order $2001 $4000 add $325 $4501 $7000 add 0375 Over $7000 add $450HOBBY HORN CA Addressees add 6% tao Send 3 Moron St [A] MO VISA/ MC 95 Eap Date oc 2212 Checkallow opts 30 days totWestminster Ca 52504 checkclearuece COD50001 charges plan $150 853-0311 handling Cash OnlyHrs Mon-Fri 5AM 5PM Flutter aviation world torsional vi bration wing vibration excited airflow over wing rule thumb used designers full-scale aircraft hove center-of-grovity wing entire airplone between leading edge wing ond 25% chord Flutter tail surfaces probably major problem because ore smaller got impression article vibration torsional bending control sur face defined flutter Control surface flut ter usually result poor assembly related what usually called wing flutter re gard failures experienced other modelers flutter may hove cause Without having details cannot give defi nite eauses other reasons failure 0 Undetected damage during handling Defective materials and/or assembly cture could withstand high control surface forces imposed during moneuvers ation combination above vibrations torsional bending combination two can caused airflow engines other sources Davids letter went discuss natural fre quency structures frequency will vibrate disturbed allowed vibrate freely included calculations probable natural frequencies models sta bilizer Despite fact Im also mechani cal engineer hard time following Davids calculations Im going include column bottom line appears flutter can induce stab failureor can develop just because structure insufficient Continued pctge 148 Hobby H0 January 1989 23 AIR WOLF EPOXY FIBERGLASS FUSELAGES TAKES MOST 50-60 MECHANICS OTHER MODELS AVAILABLE LARRY JOLLY MODEL PRODUCTS $20000 5501 WCOMO SANTA ANA CALIFORNIA 92703 714 826-6861 Safety/Preston Continued page 23 strength carry G loads occur during flight maneuvers latter situation may have likely cause stab failure described another letter received former airline pilot Q hundred years 727s Charles Pyeatt Palos Verdes Estates CA Enclosed Chucks letter photograph see elsewhere column broken stabilizer 85-in-span Waco ARE tended powered Quadra Since Chuck intended use OS 120 four-stroke light ened structure shown plans result Chucks own words Doug 11-year-old grandson RC pi lot early flight made fttst pass moderate wide-open dive stab broke bang resulted violent flutter stopped Doug pulled power off have video watch over over awe model landed OK Im now beef ing stab full-scale ARE didnt have brace wires stab will probably use Before leaving subject Id like thank Jeff Combs Brian Coriley Bill Stodgell L Ar ata Sven Corsak also wrote de scribed in-flight stabilizer failures oc curred different models Sven sent portion vertical stab detached model Perhaps Ill have fu tare column Fire in-flight stab failure in-flight fire Under heading Crash & Bum De cember 1988 column related incident model caught fire after crash said isnt often hear such incident However September 1988 issue Ru Stuf newsletter Green Bay Ruf Club read what first time report inflight fire incident experienced club president Gary Doeren coeditor newsletter wife Sandy titled Big Birds Get Hot picture below see hazards flying large Scale birds gas engine instance muffler came loose flight During flight looked smoker found some residual fuel smoke tank actuality plane onboard fire fire burned hole firewall 5/16-in-thick aircraft ply burned foam around metal tanks melted solder tanks well worst thing about situation could see no ex ternal damage landed plane cowl ing felt little warm no smoke So left plane car overnight didnt dis cover damage until next morning took cowling off reattach muffler illustration firewall newsletter Xerox copy original photograph hence cannot reproduced successfully However can assure clearly showed big hole Safety book few weeks ago returned home work find UPS left package doorstep Upon opening package found spiral-bound book entitled Safety Comes First Frank Burchardt reader Carlsbad NM responsible work art will let letter accompanied book tell about happen people dis like throwing things away Safety vol ume result kind thinking Let ex plain About year ago faced another storage problem very large stack past sues various model magazines including Model Aviation made decision reduce cubic feet magazines cutting out past ing up looseleaf binding interesting plans articles etc Among articles Safety Comes First such valid con tent plan began form mind would use club meeting safety talks Ive safety-oriented person since early days Air Force electronics/nu clear technician natural proverbial gears turned Safety material took new format Now nine chapters categorized safety-related material hand feel work needs have exposure just own club members suggest RC club should have concise ca tegorized material ongoing safety program offered through AMA nominal fee yearly basis looseleaf form clubs Safety Officer would have some needed guidelines operate hope feel will way preserve fine Safety Comes First ar tides future hobbyists FMINI-ELECT RIC OUICKCHARGEQUIET INSTANTSTARTLOWOOST ERIES VL111 $2495 Includes HY-7t B6Props Charge cord andht Batteries Riqalres Connector Access spacers etc $1795VL-111R$2795$3t95 der 7 leads QuickSame VL-111 Remote Battery Holdery VL Flight Battery rt MotorTo subslilute Buf above add $3 00VL Field box 30 size models VL-192$3295$ 995 $1395Inclades HY-42 Motor tory SJ-5 Switch t2 feel engineCharge Plug Cordoctions 148 Model Aviation MINI POWER AT ITS BEST LIGHT WEIGHT MOlS PROPS HY-lO$1495 7 1 gear ratio hgage disengage Free Wheeling grams aicloded ecaps onto meter HY-70R Same HY-70 witl Disconnects Slide Ba ldY-7tasd HY-42 Improned version HY-48 Approry EFC-590 Low cost Quick Charge 4 D'type batteries r FC-492 Ideal Above charge FLIGHT BATTERIES B-52 HY7t 2 x 5t mA-Hr B-t3 HY7t 3o St mA-Hr B-33L IHY-42-Hr B-34L HY42 B-13t BI short Frank has done something have long thought doing myself never quite got around has taken nine years writ ings cutting pasting has organized chapters contains arti cles similar nature Quite monumental task opinion forwarded Franks book Bob Underwood AMAs Technical Director asked Bob would consider Franks suggestion make book available AMA clubs some means other Just last week received copy letter Bob Frank states AMA consider ing making available clubs members might wish have Its just pride author ship makes believe would worthwhile undertaking readers similar opinion suggest drop line contact Bob Underwood directly enough let ters phone calls express interest proj ect might help convince AMA HQ staff go ahead publication Please let us know thoughts Have another safe month Seagull/Byrum Continued page 33 edges using file straightedge Studs made threaded steel rod screwed tapped plywood se curely glued inside wings Multiple lam inations /8-in five-ply work better single piece thicker plywood Use sharp tap avoid splintering wood Sat urate finished plywood thin CyA harden Incidence can adjusted screwing studs out studs themselves drilled tapped screws hold cabane interplane struts Always use Loctite keep screws vibrating loose satisfied way Seagull flies epoxy studs place Once thing permanently place Seagull can assembled field 15 minutes tail wheel takes lot abuse model make tail wheel assembly capable taking punishment used piece %2 music wire anchored nose gear mount Having tried varieties hinges like large Du-Bro type best Notice hinge pockets plans Hinges should also pegged toothpicks Giant Scale models still being lost through use unsuitable hinges careful stabilizer rm elevator rudder built same manner Cut leading edges LE trailing edges TE dimensions shown plans Mark centerline LE TE ball-point pen Pin LE TE over plans using shims tips keep cen terlines parallel building board Ribs cut patterns shown plan also marked center line gluing ribs LE TE centerlines should course meet Sheet top side fin %2 balsa Turn fin over reshim before sheet other side stab spars added after ribs glued LE/TE stab sheeted 6 balsa As fin stab turned over reshimmed other set spars added A6 sheeting glued rudder elevator ribs simple pieces 1/8 x 1-in balsa tapered meet TE Both rudder elevator built directly over plans After construction covered fabric per fullsize Seagull recommend using servo per elevator handle loads case no need join two elevator halves avoid adverse yaw ailerons need about 20/80 differential down-to-up throw right aileron goes up 200 left aileron should go down So didnt build enough differential model initially able obtain electronically adjusting settings Futaba 8FGA radio plans show arrangement should give increased mechanical differen tial over original scheme used course two servos used ailerons top bottom ailerons linked together tie rod done full-scale plane found necessary clude external static balances aile rons prototype large canopy usual focal point model case January 1989 149