Cdmes Safety ohn Preon First wind still blows models still flybut really know what wind doing flight character istics RC model Understand ing interaction may help avert crash M9re four-stroke-kick back phenome non keep prop coming off WIND revisited August 1984 issue Model Aviation column carried arti cle Tom Bilheimer editor Lehigh Valley RC Society newsletter titled Wind As predicted sParked some letters readers case missed Toms article what basically said wind blowing constant velocity no gusts turbulence does have effect reactions aircraft flight prove point Tom placed imaginary RC pilot aircraft carrier moving down wind same velocity wind other words RC pilot would have sensation no wind Some letter-writers totally disagreed Toms logic attempted prove wrong offering some incorrect logic own However letter well-known Scale builder flier Kent Walters started out saying Toms article uld apparently leave impression no corresponding safety problem aggravated wihd figured knowingly printed article primari ly get some response contrary Well worked Kent hit nail squarely head speak printed article primarily HE DED TO IERT PIN CR TOCL USED TO HD CRAMS-IAFT SEO5E TO TI G-4TEN 1-EX rJYLOK NJr cRANSHAFT ENIE CASTIN3 PR~ because hard up something new talk about and, situations Tom considered didnt say anything isnt true However part fly feet firmly planted ground perform maneu vers models attempt duplicate shown AMA rule book observed someone also firmly planted ground we can run trouble Continued page 18 PRCR z K PRGP WASI-ER cCLIJTEF6C TO FIT 4JT USED AMA SAFETY UT ~7i/1624 rNtOK 1-EX NJT 1/4-28 NYLOK 1-EX rLJT DEPEND N ~J B3 iE 16 Model Aviation Heres use elastic stop nut AMA safety nut crankshaft lithe engine backfires runs backwards stop nut keeps prop flying off QVXP IEEP BUT THIS NEW WIND COMPENSATOR MAKE ME MILLION BUCKS proud have part viuiuiuiniiuiia winning team Reno NATS total 27 out 28 contestants placed top three events used ASTRO MOTORS ASTRO MOTORS used First Second place winners Congratulations NATS winners proud SEVEN CELLSEVEN CELLUNLIMIIIOINDOORINDOOR R/COLDTIMEE/CSAILPUNEEICSAILPEANER/CENDUEM4J1/CECALE lot-SobSijItlee-JohoSrownlOt-SobBoochartot-TonyNacorratolee-AddieNacerreto Flaybny Antro CO 06Elecicon Aetro CO 06Challenger Antro COOSAnno Tortle lAntro 038Farroan Moonlicoe Snore-il 15 winScore 2763Score 2734Score 2800 mm tmo 035 2nd Bob Booth2nd Joho Van Haelo2nd- Bob SuIt2nd-John Evano2nd Mitch Poling Viking Antro CO Oh Electicoa lAatro CO 55 Sononor Aetro CO 15JE-1 lAntro 035 rith Tabloid Score-1O32rnin Scora-2B35 Score-23B2Scoro20S0njn otmoS3h 3rd Angont Fabian 3rd Since MoAvenoc, 3rd John Brown 3rd Tony Nacarrato Flaybny Anon co telito Anon CO Oh Electrico Anon CO SB Goppy Biplane score- tei 00 Scora-2b13 Score-2134 lAntro 020 mi FUONT OASS AElI RIGNI CLASS BFREE MONTINDOORINDOOR SloCiManOnerSIoCelloOLDOIMERCONIROLUNEJRISRCONTROLLINEOPEN lnt-JinrOgglnt-LeonardBodfordlnt-BobMehmnenlnt-Franktlodetlet- Lonardlff SalaBle 380 lAnen CO 06 FAI Ship lAntro CO OhCororont Clipper lAntro 020 Zero Anon 0201 F 4-U lAntmo 0201 Score -680 eec Score- 366 nec 2nd Donald 1-loahee2nd Addie Nacarrato2nd Frank Code2nd John Godel2nd Addle Nacarraro Original Aeon 035 Playboy Anon CO 15 Corontet ClipynrLhaoo03G FSF Anen 020 Bell Bonito A*On 020 Score -426 eecScore 338 nec 3rd Leonard Bedford3rd Tony Nacorrato3rd Robert Mehrrren3rd Tony Nacarrato PAl Ship Anon CO 06 Salelte 380 ILeacra LT-06 F-28 Aeon 036 Salt AD-S Anon 020 Score-t2lnec Score-237nnc L231 1 Beach Ave na Del Roy CA 2 213844j ~LiJULuJftmw W forget about wind effect has model being flown relative ground Rather risk getting trouble using own explanation Ill let Kent Walters take over major flaw Mr Bilheimers logic modelers fly reference air media model flying respect fixed ground position stand maneuvers normally want perform precision will piloted such way try correct wind conditions order prevent distortion maneuver something unrecog nizable corrections imposing control surfaces force model behave would like perceive ground can look quite different dangerous once return exemplified aircraft carrier traveling same speed direction wind flying best way further explain provide example believe can speak some authority longterm experience Suppose wind blowing right left 30 mph model forced vertical dive high altitude front directly above transmitter pilot pilot entered vertical dive going downwind plans pulling out downwind well Keep mind during descent pilot maintains vertical straight-line dive respect fixed position ground thus compensating wind drift point let us observers quick ly return rented carrier travelling same 30 mph speed direction wind cruise along spectator line see just what dive looks like As Mr Bilheimer has correctly pointed out will now experiencing no wind However looking dive maneuver removing reference fixed ground PlOte maneuver no longer appears vertical Instead maneuver looks like model has dived well past vertical descend ing reverse direction its entry respect calm air environment carrier next concern what effect will have pullout trajectoryor elevation required before commencing pulloutto achieve straight level flight point dOIt think will require much further imagination rec ognize steeper angle des cent still air elevation margin needed safely pull out problem simply pilot aware wind effectse will realize steep dive attitude relative air media model flying Instead pulling out normally straight level flight 30 feete would calm air conditions may likely plowing Continued page 20 18 Model Aviation $ 159~ InCludes shipping Tesas ins dec odd 5 Designed Turnaround Pattern iara Iq____ L_____ MODEL AIRCRAFT P0 Box 1902 GreenViIe TX 75401 214 454-6441 Littlest Miracle Workshop APROFEALTOOL Send25C SUITABLE FOR ALL forcatagog HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Super Joy Stick Sport Pattern Fun Fly Model 6 tradition ugly sticklooks better flies better builds easier costs lesswant 45-602 cycle engines 60-904 cycle engines Span61 Area720 sq Weight5A lbs $7995 SEE YOUR DEALER Try something different all-balsa Deltas Delta Dart KFIR 0 engines Area432 sq Weight4A lbs Kits contain highest quality balsa hardwoods precision machine cut fit FL FLITE LINE PRODUCTS RL 9 Box 437 Lubbock TX 79423 806-795-6483 model runway hes pulling out downwind direction Unless pilot compensates early pullout left immediate sensation model has lost some degree elevator responsiveness lucky will experience following few moments exemplified problem also very similar backside descent downwind loop loop fixed rela tive ground severe wind cases insufficient elevator control available classical Figure 9 results Scale en thusiasts may familiar name Kent Walters let just say very familiar dive maneuver used example wind can affect safety flying Kent well-known Scale contests ver tical dive bombing run performs Dauntless memory serves correctly think last California Nats mid-Seventies Kent made miscalculation plowed runway dont recollect whether downwind dive Lets move category modeling wind always factor during flight namely Control Line models let ter TM Jennings Paducah KY identified potential safety problem store-bought control lines fact two problems found set 60-foot lines came crimped brass tube end-connections First although box marked 050-60 meaning lines 0015 diameter 60 feet long actually 70-foot lines However according Mr Jennings primary serious defect crimps brass tube did secure stainless steel lines lines able pull through Let start addressing serious defect first no excuse manufacturer ship lines crimpedtube end connections dont secure lines CL modelers follow AMA Safety Code would probably discover such problem before flying portion Safety Code refer item No 1 under Control Line states will subject complete control system including safety thong applicable inspection pull test prior flying pull tests required prior flight con test wonder times CL sport modelers perform such test Control Line flier magazine ar rived mailbox because AMA member let suggest take few minutes read what says about pull tests under Control Line General page 17 current 1984-85 AMA rule book Control Line General section rulebook also addresses line length Continued page 127 20 Model Aviation $225 strips$ 145 Add 20% postage APPLIED DESIGN CORP 138 Penn Street El Seeundo CA 90245 Tuned Pipe Connector 4 $950 plus postagel$ California Residents add 6% sales tax No mere blow outs lost pipes ghtly ties dumps r nest uppearonce beets Fits 40 60 engines 800 die 35 ox components compression sea. une silIcone 0 rings ector comes wltb a 0 ring AdditIonal 0 rings moy porcbesed sending e self-addressed stamped envelope S0for 0 ring Pet No 4310173 Type L1 NEW Tuned Pipe Clomps Mochinad fromII $350 Aluminum ond include mounting hardwore Type T-I Please mete aN Howard Power got Idea tore wetar cooled connector developed Type 0-2 has bean running two about two months end far no burned Out staisless steel strep 0 rings other failure Wotch to-it hove original con-15k aluminum hess Adlust nectors wege Price water cooledIS shamed Sri aft exces connecto tubing $ Water cooled connec boats $18 SafetylPreston Continued page 20 paragraph 3 section iage 17 states Lines may stored between flights lengths must measured before official flight also states paragraph 52 length control lines measured center point grip part control han dle device fore-and-aft centerline model So contest flier its likely will measure line lengths prior flight may also elect shorten cut-to-length lines account portion model control handle part measured length Again its sport modeler may surprise didnt check line length got 70-foot lines instead 60-footers did Mr Jen nings can urge check both length strength store-bought control lines June 1984 issue Model Aviation reprinted article club newslet ter concerned kick-back fourstroke engines potential hazard prop flying off happens writer article Orville Mills suggestion club write engine manufacturers recommend put drive pins propeller backplate prevent happening dont know whether club Benton County RC Club Oregon accepted suggestion upon publication June magazine received letter Scott Fahnestock World Engines formed OS four-stroke engines over 060 cid being equipped drive pins During last month received copy another club newsletter containing article drive pins four-strokes sent Bob Angel editor newsletter SAM No 26 Bobs experiences follow Exploding Propellers John Preston Safety editor ModelAviation ran letter June issue fellow having problems hand-starting OS 90 four-cycle seems 90 kick ing back heavily throwing its prop ended up recommending OS put pins through prop similar practice larger engines coincidence 05 90 four-stroke arriving just few days after read took notice examined new engine darned OS hadnt pinned drive washer fast work OS proceeded break having no problems hand-starting anything else until started running faster small 12-in prop turning about 11500 rpm prop literally exploded shattering completely hub piece put mean-looking gash ground directly below other landed about 20 feet away about 20 seconds later day later same thing happened flight landed no part prop left have since read others have same exper ience pinned props removed pins far no problem Inci dentally suspect guy having hand-starting problems getting prop chicken stick beat up may have propping four-cycle wrong direction have follow instructions carefully four-stroke after priming prop clockwise crank hard allow fingers chicken stick slide off blade because fires before TDC top dead CRCFCED UP Get back ho air test Sig fuselage wing kits Sig kits have replacement fuselage end wing kit plus ether kit items repair model including cowls wheel pants turtle decks canopies wire aluminum landing gear decals much much prices see Sig Catalog order send check money order Sig Mtg Co Inc 401-7 So Front St Montezuma IA 50171 Phone 1-800-247-5008 orders within United States esciuding Alaska Hawaii Iowa 515 623-5154 AIU FLYTHE BEST-FLY SIG I] Li [liii WAIU WA ri LU-lU TWU lii U s thrilling spirit flight caught artist Nuts bolts detail com plete pilots expressions Prints Untrained-Framed-Matted Framed Send $200 Redeemable fIrst pur chase 12 page pictorial catalog 40 planes canvas jets November1984 127 Hal Payne Enterprises 1843 W Torrance Blvd Torrance CA 90501 213 320-3063Dealer Inquiries Welcome Shipped ky First Osas mail tar quick dalivary Shipping C1mges Cesmectaree$150 1 Ceneactar mediClemp$150 lOmsp$100 24dosps$150 Addliseal Omopseack$ 30 Satisfaction Guaranteed Money Back NOW Y-FREE STARTING POWER New completely automatic maintenance system field kit starter batteries No run-down batteries undercharged No boiled-dry batteries overcharged No explosive gasses generated No winter storage problems No attention required tronically maintains full charge JUST CONNECT IT FORGET IT Introductory Offer p us CaRaSfl95 1200 Spec fy 120 24 vo Products PO Box 221 Canton SD 57013 605 987-5924 SASE information centerRMcM comes right back starting itself counterclockwise Before beginning discussion latest account four-stroke engine kick back/props/drive-pins etc let make clear possess fourstroke engines advice might offer must come information received others Bobs technique starting four-stroke engine flipping prop backwards clockwise has suggested other readers Ive used myself Tartan engine habit running backwards flipped prop forwards letter Scott Fahne stock produced response ac companied operating instructions 05 FS-90 four-stroke engine two starting techniques de scribed Under heading START ING manufacturer first states advisable use electric starter starting although hand-starting also possible instructions describe both electric starter procedure starting hand-starting procedure latter procedure after engine primed tells ip pro peller clockwise center right blade engine will bounce smartly counter-clockwise direction point ignition expansion charge takes place So back wards technique hand-starting od engine letter Scott Fahnestock enclosed copy Bobs account props exploding requested comments Scotts response following say Harry Roe engine expert broke problem down two parts first has prop itself ap plies engines both two- fourstroke prop nut tightened down wood fibers prop compressed hub actually shrinks vibration starts shake things loose needs tightened down again Harry recommends prop nut tightened before flying season second factor Harry cites pecu liar four-stroke engines Due longer stroke higher compression ratio four-stroke engines sub ject detonation fuel mix too lean rpm too high Detona tion very violent explosion combustion chamber completely breaks down fuel molecules violent piston instead going up over top complete its stroke driven back down driving crankshaft backwards loosening prop Pro longed detonation can cause engine overheat eventually sieze solu tion simple does require some self-restraint Dont lean needle way out modeler wants wring last possible rpm out engine should stick two-stroke engines testing shows four-strokes comfortable 8000 10000 rpm operating range 14 x 9 Davis prop FS-90 peaked 10200 hope helps out Please note sections FS-90 instructions highlighted problem certainly want air outit dangerous engine modeler two highlighted sections instructions accompanied Scotts letter follows First start engine run about 10 seconds needle-valve set 6000/7000 rpm open nee dle-valve reduce speed approximate ly 4000 rpm run 20 seconds cooler setting Keep throttle fully open using needle valve reduce speed Caution close needle valve too lean setting will cause engine overheat slow down Set needle valve very slightly rich side peak rpm setting Make sure engine fully broken-in abouf hour total running time short runs before operating continuously full throttle preceeding information World Engines together conversa tions correspondence owners four-stroke engines leads believe modelers switch two-stroke four-stroke engines need educated CHUCK WOOD ty [lank CIarkCLIPPED WIfsJG AtsJGEL5 ALL RlRTlRL6TI4lS IS 7IT ALSO MEANS SHES NUTSTHESEGLS ONT WASHYHAZEL 5WUl- YOLJE WiVE JUST SELN lNVlTENO lvioR o ARE EMOTIONIALL UNsTA5LE CAN ILJSTFEELTHE WHIZ WHIPTHEM TO JOIN OU FIPS-ri-i-us csiwTHEIR L~TLE HEARTS AREAS THEIR MENTALINTO SHAPE REMEMBER INTERNATIONAL EXPOSITIONOFF LOOKlNFARAWAY FROM HERE AS AM MOTORS AREDR VOLTAGE WARNINGTHAT MEANS TEAM DRILLFOR BOY!FROM NELSON ED-1Vj--~ WAY OFF TIMUSJGAILKP TI-IEM IN LINE FROM NOW ONflS MUCH TOO EARL w. oR i tic 128 Model Aviation IMSeett7 SpenSaaUaepUSA VSr SpenSISrnepUSA ItOt Spa,Sam ppUSA 2rI63 enlpa52550 ppUSA 24I53 SeenSapoeppUSA 2% I94 SpanSanSeppUSA afl IU SpanSUCH ppUSA Fiberliege & Canopies available Send Stamp the detailed Brochures oar Giant Scale Accessories Oar Plane snot PostPaid OOthin USA Nick Zirali 29 Ed9or Delve SniShSown NY 11797 USA operate latter As pre viously stated have no experience tuning four-stroke model engines everything read about procedure points towards too lean needle valve set ting prime cause engine kick back appears top-end rpm four-stroke much less affected changes fuel mixture needle valve set ting two-stroke As result tendency adjust mixture too lean can produce detonation kickback would recommend use tachometer ensure highspeed mixture always set rich side optimum Meanwhile what can about props spinning off breaking kickback should still occur recently received letters two readers both suggested use elastic stop nut retain prop prevent completely detaching crankshaft should engine kick back Jim Weatherly Seattle Radio Aero Club 90 two-stroke engine throw its prop distance about 40 feet prevent future occurrences type uses elastic stop nuts bigger engines letter states nuts metal plastic inserts grip threads kicked loose go about half turn prop free-wheels stop prop shaft other letter came Bill Hoff meister flies Indy R/G South Flying Club previous ly sent picture clubs frequency control board appeared col umn August 1983 issue Bill en closed drawing shows another club member solved prop detachment problem letter follows am member Indy R/G South Flying Club have working fellow flier four-stroke 120 severe problem backfiring causing prop come off him First tried using two prop nuts result didnt help much Second tried four bolts through hub some using now did work time prop split two pieces coming him instead Third went hex Nylok nut Now engine backfires prop slips little nut has retightened still safe AMA safety nut needs drilled counterbored just little less thickness hex Nylok nut helps keep AMA nut locked place fellow flier has prop come off again since used parts like drawing indicates drawing Bills letter refers shown page 16 magazine il lustrates typical assembly using Nylok nut combination AMA safety nut retain prop Note hole drilled prop drive plate pin inserted hold engine crankshaft stationary Nylok AMA nuts tightened As alterna tive hole could mill file wrenching flats drive plate seems elastic stop nut Nylok trade name suggestion simultanteously suggested both Jim Weatherly Bill Hoffmeister may solution prop-breakage/propflying-off type incident Note stated Jim backfires props coming loose arent confined four-stroke engines As contest fliers will probably test happens frequently running out time trying start engine front judges Perhaps some hobby accessory manufac turer should consider producing AMA safety nuts built-in plastic locking inserts Have safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 FunlWinter Continued page 28 fun guys have come full circle limit comments aircraft us have before know will build next year Get away nets What woke up cover Australian magazine Airborne Tom Prossers turnaround model first Id seen sent away plans sure some big engine pipe design big lots area tail-drag ger gear never blind faith trike gears anyway bit dihedral nicelytapered wing proportions could iden tif 40 would safe Falcon 56 Kadetfor loaf-around mood 60 sporty wingovers tame rolls invertedyour basic hacker aerobaticsits speed responses would beyond us sort basic trainer turnaround flying Well seeing things like Flashback Taurus Around 1960 reed systems domi nant Proportional coming Kraft proving its time come Thousands us still counted pennies stuck escapements time family man aged second-hand reed systems good reed fliers capable pulsing simultane ously forest control sticksthere rows sticks Fingers blurred planes could fly proportionally smooth silk needed concert pianist truly didnt control escapement planes commanded ship go certain position its own did commanded maneuver quick blip actuated throttle escapementjust high low signal held Right Two November1984 129
Edition: Model Aviation - 1984/11
Page Numbers: 16, 18, 20, 127, 128, 129
Cdmes Safety ohn Preon First wind still blows models still flybut really know what wind doing flight character istics RC model Understand ing interaction may help avert crash M9re four-stroke-kick back phenome non keep prop coming off WIND revisited August 1984 issue Model Aviation column carried arti cle Tom Bilheimer editor Lehigh Valley RC Society newsletter titled Wind As predicted sParked some letters readers case missed Toms article what basically said wind blowing constant velocity no gusts turbulence does have effect reactions aircraft flight prove point Tom placed imaginary RC pilot aircraft carrier moving down wind same velocity wind other words RC pilot would have sensation no wind Some letter-writers totally disagreed Toms logic attempted prove wrong offering some incorrect logic own However letter well-known Scale builder flier Kent Walters started out saying Toms article uld apparently leave impression no corresponding safety problem aggravated wihd figured knowingly printed article primari ly get some response contrary Well worked Kent hit nail squarely head speak printed article primarily HE DED TO IERT PIN CR TOCL USED TO HD CRAMS-IAFT SEO5E TO TI G-4TEN 1-EX rJYLOK NJr cRANSHAFT ENIE CASTIN3 PR~ because hard up something new talk about and, situations Tom considered didnt say anything isnt true However part fly feet firmly planted ground perform maneu vers models attempt duplicate shown AMA rule book observed someone also firmly planted ground we can run trouble Continued page 18 PRCR z K PRGP WASI-ER cCLIJTEF6C TO FIT 4JT USED AMA SAFETY UT ~7i/1624 rNtOK 1-EX NJT 1/4-28 NYLOK 1-EX rLJT DEPEND N ~J B3 iE 16 Model Aviation Heres use elastic stop nut AMA safety nut crankshaft lithe engine backfires runs backwards stop nut keeps prop flying off QVXP IEEP BUT THIS NEW WIND COMPENSATOR MAKE ME MILLION BUCKS proud have part viuiuiuiniiuiia winning team Reno NATS total 27 out 28 contestants placed top three events used ASTRO MOTORS ASTRO MOTORS used First Second place winners Congratulations NATS winners proud SEVEN CELLSEVEN CELLUNLIMIIIOINDOORINDOOR R/COLDTIMEE/CSAILPUNEEICSAILPEANER/CENDUEM4J1/CECALE lot-SobSijItlee-JohoSrownlOt-SobBoochartot-TonyNacorratolee-AddieNacerreto Flaybny Antro CO 06Elecicon Aetro CO 06Challenger Antro COOSAnno Tortle lAntro 038Farroan Moonlicoe Snore-il 15 winScore 2763Score 2734Score 2800 mm tmo 035 2nd Bob Booth2nd Joho Van Haelo2nd- Bob SuIt2nd-John Evano2nd Mitch Poling Viking Antro CO Oh Electicoa lAatro CO 55 Sononor Aetro CO 15JE-1 lAntro 035 rith Tabloid Score-1O32rnin Scora-2B35 Score-23B2Scoro20S0njn otmoS3h 3rd Angont Fabian 3rd Since MoAvenoc, 3rd John Brown 3rd Tony Nacarrato Flaybny Anon co telito Anon CO Oh Electrico Anon CO SB Goppy Biplane score- tei 00 Scora-2b13 Score-2134 lAntro 020 mi FUONT OASS AElI RIGNI CLASS BFREE MONTINDOORINDOOR SloCiManOnerSIoCelloOLDOIMERCONIROLUNEJRISRCONTROLLINEOPEN lnt-JinrOgglnt-LeonardBodfordlnt-BobMehmnenlnt-Franktlodetlet- Lonardlff SalaBle 380 lAnen CO 06 FAI Ship lAntro CO OhCororont Clipper lAntro 020 Zero Anon 0201 F 4-U lAntmo 0201 Score -680 eec Score- 366 nec 2nd Donald 1-loahee2nd Addie Nacarrato2nd Frank Code2nd John Godel2nd Addle Nacarraro Original Aeon 035 Playboy Anon CO 15 Corontet ClipynrLhaoo03G FSF Anen 020 Bell Bonito A*On 020 Score -426 eecScore 338 nec 3rd Leonard Bedford3rd Tony Nacorrato3rd Robert Mehrrren3rd Tony Nacarrato PAl Ship Anon CO 06 Salelte 380 ILeacra LT-06 F-28 Aeon 036 Salt AD-S Anon 020 Score-t2lnec Score-237nnc L231 1 Beach Ave na Del Roy CA 2 213844j ~LiJULuJftmw W forget about wind effect has model being flown relative ground Rather risk getting trouble using own explanation Ill let Kent Walters take over major flaw Mr Bilheimers logic modelers fly reference air media model flying respect fixed ground position stand maneuvers normally want perform precision will piloted such way try correct wind conditions order prevent distortion maneuver something unrecog nizable corrections imposing control surfaces force model behave would like perceive ground can look quite different dangerous once return exemplified aircraft carrier traveling same speed direction wind flying best way further explain provide example believe can speak some authority longterm experience Suppose wind blowing right left 30 mph model forced vertical dive high altitude front directly above transmitter pilot pilot entered vertical dive going downwind plans pulling out downwind well Keep mind during descent pilot maintains vertical straight-line dive respect fixed position ground thus compensating wind drift point let us observers quick ly return rented carrier travelling same 30 mph speed direction wind cruise along spectator line see just what dive looks like As Mr Bilheimer has correctly pointed out will now experiencing no wind However looking dive maneuver removing reference fixed ground PlOte maneuver no longer appears vertical Instead maneuver looks like model has dived well past vertical descend ing reverse direction its entry respect calm air environment carrier next concern what effect will have pullout trajectoryor elevation required before commencing pulloutto achieve straight level flight point dOIt think will require much further imagination rec ognize steeper angle des cent still air elevation margin needed safely pull out problem simply pilot aware wind effectse will realize steep dive attitude relative air media model flying Instead pulling out normally straight level flight 30 feete would calm air conditions may likely plowing Continued page 20 18 Model Aviation $ 159~ InCludes shipping Tesas ins dec odd 5 Designed Turnaround Pattern iara Iq____ L_____ MODEL AIRCRAFT P0 Box 1902 GreenViIe TX 75401 214 454-6441 Littlest Miracle Workshop APROFEALTOOL Send25C SUITABLE FOR ALL forcatagog HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Super Joy Stick Sport Pattern Fun Fly Model 6 tradition ugly sticklooks better flies better builds easier costs lesswant 45-602 cycle engines 60-904 cycle engines Span61 Area720 sq Weight5A lbs $7995 SEE YOUR DEALER Try something different all-balsa Deltas Delta Dart KFIR 0 engines Area432 sq Weight4A lbs Kits contain highest quality balsa hardwoods precision machine cut fit FL FLITE LINE PRODUCTS RL 9 Box 437 Lubbock TX 79423 806-795-6483 model runway hes pulling out downwind direction Unless pilot compensates early pullout left immediate sensation model has lost some degree elevator responsiveness lucky will experience following few moments exemplified problem also very similar backside descent downwind loop loop fixed rela tive ground severe wind cases insufficient elevator control available classical Figure 9 results Scale en thusiasts may familiar name Kent Walters let just say very familiar dive maneuver used example wind can affect safety flying Kent well-known Scale contests ver tical dive bombing run performs Dauntless memory serves correctly think last California Nats mid-Seventies Kent made miscalculation plowed runway dont recollect whether downwind dive Lets move category modeling wind always factor during flight namely Control Line models let ter TM Jennings Paducah KY identified potential safety problem store-bought control lines fact two problems found set 60-foot lines came crimped brass tube end-connections First although box marked 050-60 meaning lines 0015 diameter 60 feet long actually 70-foot lines However according Mr Jennings primary serious defect crimps brass tube did secure stainless steel lines lines able pull through Let start addressing serious defect first no excuse manufacturer ship lines crimpedtube end connections dont secure lines CL modelers follow AMA Safety Code would probably discover such problem before flying portion Safety Code refer item No 1 under Control Line states will subject complete control system including safety thong applicable inspection pull test prior flying pull tests required prior flight con test wonder times CL sport modelers perform such test Control Line flier magazine ar rived mailbox because AMA member let suggest take few minutes read what says about pull tests under Control Line General page 17 current 1984-85 AMA rule book Control Line General section rulebook also addresses line length Continued page 127 20 Model Aviation $225 strips$ 145 Add 20% postage APPLIED DESIGN CORP 138 Penn Street El Seeundo CA 90245 Tuned Pipe Connector 4 $950 plus postagel$ California Residents add 6% sales tax No mere blow outs lost pipes ghtly ties dumps r nest uppearonce beets Fits 40 60 engines 800 die 35 ox components compression sea. une silIcone 0 rings ector comes wltb a 0 ring AdditIonal 0 rings moy porcbesed sending e self-addressed stamped envelope S0for 0 ring Pet No 4310173 Type L1 NEW Tuned Pipe Clomps Mochinad fromII $350 Aluminum ond include mounting hardwore Type T-I Please mete aN Howard Power got Idea tore wetar cooled connector developed Type 0-2 has bean running two about two months end far no burned Out staisless steel strep 0 rings other failure Wotch to-it hove original con-15k aluminum hess Adlust nectors wege Price water cooledIS shamed Sri aft exces connecto tubing $ Water cooled connec boats $18 SafetylPreston Continued page 20 paragraph 3 section iage 17 states Lines may stored between flights lengths must measured before official flight also states paragraph 52 length control lines measured center point grip part control han dle device fore-and-aft centerline model So contest flier its likely will measure line lengths prior flight may also elect shorten cut-to-length lines account portion model control handle part measured length Again its sport modeler may surprise didnt check line length got 70-foot lines instead 60-footers did Mr Jen nings can urge check both length strength store-bought control lines June 1984 issue Model Aviation reprinted article club newslet ter concerned kick-back fourstroke engines potential hazard prop flying off happens writer article Orville Mills suggestion club write engine manufacturers recommend put drive pins propeller backplate prevent happening dont know whether club Benton County RC Club Oregon accepted suggestion upon publication June magazine received letter Scott Fahnestock World Engines formed OS four-stroke engines over 060 cid being equipped drive pins During last month received copy another club newsletter containing article drive pins four-strokes sent Bob Angel editor newsletter SAM No 26 Bobs experiences follow Exploding Propellers John Preston Safety editor ModelAviation ran letter June issue fellow having problems hand-starting OS 90 four-cycle seems 90 kick ing back heavily throwing its prop ended up recommending OS put pins through prop similar practice larger engines coincidence 05 90 four-stroke arriving just few days after read took notice examined new engine darned OS hadnt pinned drive washer fast work OS proceeded break having no problems hand-starting anything else until started running faster small 12-in prop turning about 11500 rpm prop literally exploded shattering completely hub piece put mean-looking gash ground directly below other landed about 20 feet away about 20 seconds later day later same thing happened flight landed no part prop left have since read others have same exper ience pinned props removed pins far no problem Inci dentally suspect guy having hand-starting problems getting prop chicken stick beat up may have propping four-cycle wrong direction have follow instructions carefully four-stroke after priming prop clockwise crank hard allow fingers chicken stick slide off blade because fires before TDC top dead CRCFCED UP Get back ho air test Sig fuselage wing kits Sig kits have replacement fuselage end wing kit plus ether kit items repair model including cowls wheel pants turtle decks canopies wire aluminum landing gear decals much much prices see Sig Catalog order send check money order Sig Mtg Co Inc 401-7 So Front St Montezuma IA 50171 Phone 1-800-247-5008 orders within United States esciuding Alaska Hawaii Iowa 515 623-5154 AIU FLYTHE BEST-FLY SIG I] Li [liii WAIU WA ri LU-lU TWU lii U s thrilling spirit flight caught artist Nuts bolts detail com plete pilots expressions Prints Untrained-Framed-Matted Framed Send $200 Redeemable fIrst pur chase 12 page pictorial catalog 40 planes canvas jets November1984 127 Hal Payne Enterprises 1843 W Torrance Blvd Torrance CA 90501 213 320-3063Dealer Inquiries Welcome Shipped ky First Osas mail tar quick dalivary Shipping C1mges Cesmectaree$150 1 Ceneactar mediClemp$150 lOmsp$100 24dosps$150 Addliseal Omopseack$ 30 Satisfaction Guaranteed Money Back NOW Y-FREE STARTING POWER New completely automatic maintenance system field kit starter batteries No run-down batteries undercharged No boiled-dry batteries overcharged No explosive gasses generated No winter storage problems No attention required tronically maintains full charge JUST CONNECT IT FORGET IT Introductory Offer p us CaRaSfl95 1200 Spec fy 120 24 vo Products PO Box 221 Canton SD 57013 605 987-5924 SASE information centerRMcM comes right back starting itself counterclockwise Before beginning discussion latest account four-stroke engine kick back/props/drive-pins etc let make clear possess fourstroke engines advice might offer must come information received others Bobs technique starting four-stroke engine flipping prop backwards clockwise has suggested other readers Ive used myself Tartan engine habit running backwards flipped prop forwards letter Scott Fahne stock produced response ac companied operating instructions 05 FS-90 four-stroke engine two starting techniques de scribed Under heading START ING manufacturer first states advisable use electric starter starting although hand-starting also possible instructions describe both electric starter procedure starting hand-starting procedure latter procedure after engine primed tells ip pro peller clockwise center right blade engine will bounce smartly counter-clockwise direction point ignition expansion charge takes place So back wards technique hand-starting od engine letter Scott Fahnestock enclosed copy Bobs account props exploding requested comments Scotts response following say Harry Roe engine expert broke problem down two parts first has prop itself ap plies engines both two- fourstroke prop nut tightened down wood fibers prop compressed hub actually shrinks vibration starts shake things loose needs tightened down again Harry recommends prop nut tightened before flying season second factor Harry cites pecu liar four-stroke engines Due longer stroke higher compression ratio four-stroke engines sub ject detonation fuel mix too lean rpm too high Detona tion very violent explosion combustion chamber completely breaks down fuel molecules violent piston instead going up over top complete its stroke driven back down driving crankshaft backwards loosening prop Pro longed detonation can cause engine overheat eventually sieze solu tion simple does require some self-restraint Dont lean needle way out modeler wants wring last possible rpm out engine should stick two-stroke engines testing shows four-strokes comfortable 8000 10000 rpm operating range 14 x 9 Davis prop FS-90 peaked 10200 hope helps out Please note sections FS-90 instructions highlighted problem certainly want air outit dangerous engine modeler two highlighted sections instructions accompanied Scotts letter follows First start engine run about 10 seconds needle-valve set 6000/7000 rpm open nee dle-valve reduce speed approximate ly 4000 rpm run 20 seconds cooler setting Keep throttle fully open using needle valve reduce speed Caution close needle valve too lean setting will cause engine overheat slow down Set needle valve very slightly rich side peak rpm setting Make sure engine fully broken-in abouf hour total running time short runs before operating continuously full throttle preceeding information World Engines together conversa tions correspondence owners four-stroke engines leads believe modelers switch two-stroke four-stroke engines need educated CHUCK WOOD ty [lank CIarkCLIPPED WIfsJG AtsJGEL5 ALL RlRTlRL6TI4lS IS 7IT ALSO MEANS SHES NUTSTHESEGLS ONT WASHYHAZEL 5WUl- YOLJE WiVE JUST SELN lNVlTENO lvioR o ARE EMOTIONIALL UNsTA5LE CAN ILJSTFEELTHE WHIZ WHIPTHEM TO JOIN OU FIPS-ri-i-us csiwTHEIR L~TLE HEARTS AREAS THEIR MENTALINTO SHAPE REMEMBER INTERNATIONAL EXPOSITIONOFF LOOKlNFARAWAY FROM HERE AS AM MOTORS AREDR VOLTAGE WARNINGTHAT MEANS TEAM DRILLFOR BOY!FROM NELSON ED-1Vj--~ WAY OFF TIMUSJGAILKP TI-IEM IN LINE FROM NOW ONflS MUCH TOO EARL w. oR i tic 128 Model Aviation IMSeett7 SpenSaaUaepUSA VSr SpenSISrnepUSA ItOt Spa,Sam ppUSA 2rI63 enlpa52550 ppUSA 24I53 SeenSapoeppUSA 2% I94 SpanSanSeppUSA afl IU SpanSUCH ppUSA Fiberliege & Canopies available Send Stamp the detailed Brochures oar Giant Scale Accessories Oar Plane snot PostPaid OOthin USA Nick Zirali 29 Ed9or Delve SniShSown NY 11797 USA operate latter As pre viously stated have no experience tuning four-stroke model engines everything read about procedure points towards too lean needle valve set ting prime cause engine kick back appears top-end rpm four-stroke much less affected changes fuel mixture needle valve set ting two-stroke As result tendency adjust mixture too lean can produce detonation kickback would recommend use tachometer ensure highspeed mixture always set rich side optimum Meanwhile what can about props spinning off breaking kickback should still occur recently received letters two readers both suggested use elastic stop nut retain prop prevent completely detaching crankshaft should engine kick back Jim Weatherly Seattle Radio Aero Club 90 two-stroke engine throw its prop distance about 40 feet prevent future occurrences type uses elastic stop nuts bigger engines letter states nuts metal plastic inserts grip threads kicked loose go about half turn prop free-wheels stop prop shaft other letter came Bill Hoff meister flies Indy R/G South Flying Club previous ly sent picture clubs frequency control board appeared col umn August 1983 issue Bill en closed drawing shows another club member solved prop detachment problem letter follows am member Indy R/G South Flying Club have working fellow flier four-stroke 120 severe problem backfiring causing prop come off him First tried using two prop nuts result didnt help much Second tried four bolts through hub some using now did work time prop split two pieces coming him instead Third went hex Nylok nut Now engine backfires prop slips little nut has retightened still safe AMA safety nut needs drilled counterbored just little less thickness hex Nylok nut helps keep AMA nut locked place fellow flier has prop come off again since used parts like drawing indicates drawing Bills letter refers shown page 16 magazine il lustrates typical assembly using Nylok nut combination AMA safety nut retain prop Note hole drilled prop drive plate pin inserted hold engine crankshaft stationary Nylok AMA nuts tightened As alterna tive hole could mill file wrenching flats drive plate seems elastic stop nut Nylok trade name suggestion simultanteously suggested both Jim Weatherly Bill Hoffmeister may solution prop-breakage/propflying-off type incident Note stated Jim backfires props coming loose arent confined four-stroke engines As contest fliers will probably test happens frequently running out time trying start engine front judges Perhaps some hobby accessory manufac turer should consider producing AMA safety nuts built-in plastic locking inserts Have safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 FunlWinter Continued page 28 fun guys have come full circle limit comments aircraft us have before know will build next year Get away nets What woke up cover Australian magazine Airborne Tom Prossers turnaround model first Id seen sent away plans sure some big engine pipe design big lots area tail-drag ger gear never blind faith trike gears anyway bit dihedral nicelytapered wing proportions could iden tif 40 would safe Falcon 56 Kadetfor loaf-around mood 60 sporty wingovers tame rolls invertedyour basic hacker aerobaticsits speed responses would beyond us sort basic trainer turnaround flying Well seeing things like Flashback Taurus Around 1960 reed systems domi nant Proportional coming Kraft proving its time come Thousands us still counted pennies stuck escapements time family man aged second-hand reed systems good reed fliers capable pulsing simultane ously forest control sticksthere rows sticks Fingers blurred planes could fly proportionally smooth silk needed concert pianist truly didnt control escapement planes commanded ship go certain position its own did commanded maneuver quick blip actuated throttle escapementjust high low signal held Right Two November1984 129
Edition: Model Aviation - 1984/11
Page Numbers: 16, 18, 20, 127, 128, 129
Cdmes Safety ohn Preon First wind still blows models still flybut really know what wind doing flight character istics RC model Understand ing interaction may help avert crash M9re four-stroke-kick back phenome non keep prop coming off WIND revisited August 1984 issue Model Aviation column carried arti cle Tom Bilheimer editor Lehigh Valley RC Society newsletter titled Wind As predicted sParked some letters readers case missed Toms article what basically said wind blowing constant velocity no gusts turbulence does have effect reactions aircraft flight prove point Tom placed imaginary RC pilot aircraft carrier moving down wind same velocity wind other words RC pilot would have sensation no wind Some letter-writers totally disagreed Toms logic attempted prove wrong offering some incorrect logic own However letter well-known Scale builder flier Kent Walters started out saying Toms article uld apparently leave impression no corresponding safety problem aggravated wihd figured knowingly printed article primari ly get some response contrary Well worked Kent hit nail squarely head speak printed article primarily HE DED TO IERT PIN CR TOCL USED TO HD CRAMS-IAFT SEO5E TO TI G-4TEN 1-EX rJYLOK NJr cRANSHAFT ENIE CASTIN3 PR~ because hard up something new talk about and, situations Tom considered didnt say anything isnt true However part fly feet firmly planted ground perform maneu vers models attempt duplicate shown AMA rule book observed someone also firmly planted ground we can run trouble Continued page 18 PRCR z K PRGP WASI-ER cCLIJTEF6C TO FIT 4JT USED AMA SAFETY UT ~7i/1624 rNtOK 1-EX NJT 1/4-28 NYLOK 1-EX rLJT DEPEND N ~J B3 iE 16 Model Aviation Heres use elastic stop nut AMA safety nut crankshaft lithe engine backfires runs backwards stop nut keeps prop flying off QVXP IEEP BUT THIS NEW WIND COMPENSATOR MAKE ME MILLION BUCKS proud have part viuiuiuiniiuiia winning team Reno NATS total 27 out 28 contestants placed top three events used ASTRO MOTORS ASTRO MOTORS used First Second place winners Congratulations NATS winners proud SEVEN CELLSEVEN CELLUNLIMIIIOINDOORINDOOR R/COLDTIMEE/CSAILPUNEEICSAILPEANER/CENDUEM4J1/CECALE lot-SobSijItlee-JohoSrownlOt-SobBoochartot-TonyNacorratolee-AddieNacerreto Flaybny Antro CO 06Elecicon Aetro CO 06Challenger Antro COOSAnno Tortle lAntro 038Farroan Moonlicoe Snore-il 15 winScore 2763Score 2734Score 2800 mm tmo 035 2nd Bob Booth2nd Joho Van Haelo2nd- Bob SuIt2nd-John Evano2nd Mitch Poling Viking Antro CO Oh Electicoa lAatro CO 55 Sononor Aetro CO 15JE-1 lAntro 035 rith Tabloid Score-1O32rnin Scora-2B35 Score-23B2Scoro20S0njn otmoS3h 3rd Angont Fabian 3rd Since MoAvenoc, 3rd John Brown 3rd Tony Nacarrato Flaybny Anon co telito Anon CO Oh Electrico Anon CO SB Goppy Biplane score- tei 00 Scora-2b13 Score-2134 lAntro 020 mi FUONT OASS AElI RIGNI CLASS BFREE MONTINDOORINDOOR SloCiManOnerSIoCelloOLDOIMERCONIROLUNEJRISRCONTROLLINEOPEN lnt-JinrOgglnt-LeonardBodfordlnt-BobMehmnenlnt-Franktlodetlet- Lonardlff SalaBle 380 lAnen CO 06 FAI Ship lAntro CO OhCororont Clipper lAntro 020 Zero Anon 0201 F 4-U lAntmo 0201 Score -680 eec Score- 366 nec 2nd Donald 1-loahee2nd Addie Nacarrato2nd Frank Code2nd John Godel2nd Addle Nacarraro Original Aeon 035 Playboy Anon CO 15 Corontet ClipynrLhaoo03G FSF Anen 020 Bell Bonito A*On 020 Score -426 eecScore 338 nec 3rd Leonard Bedford3rd Tony Nacorrato3rd Robert Mehrrren3rd Tony Nacarrato PAl Ship Anon CO 06 Salelte 380 ILeacra LT-06 F-28 Aeon 036 Salt AD-S Anon 020 Score-t2lnec Score-237nnc L231 1 Beach Ave na Del Roy CA 2 213844j ~LiJULuJftmw W forget about wind effect has model being flown relative ground Rather risk getting trouble using own explanation Ill let Kent Walters take over major flaw Mr Bilheimers logic modelers fly reference air media model flying respect fixed ground position stand maneuvers normally want perform precision will piloted such way try correct wind conditions order prevent distortion maneuver something unrecog nizable corrections imposing control surfaces force model behave would like perceive ground can look quite different dangerous once return exemplified aircraft carrier traveling same speed direction wind flying best way further explain provide example believe can speak some authority longterm experience Suppose wind blowing right left 30 mph model forced vertical dive high altitude front directly above transmitter pilot pilot entered vertical dive going downwind plans pulling out downwind well Keep mind during descent pilot maintains vertical straight-line dive respect fixed position ground thus compensating wind drift point let us observers quick ly return rented carrier travelling same 30 mph speed direction wind cruise along spectator line see just what dive looks like As Mr Bilheimer has correctly pointed out will now experiencing no wind However looking dive maneuver removing reference fixed ground PlOte maneuver no longer appears vertical Instead maneuver looks like model has dived well past vertical descend ing reverse direction its entry respect calm air environment carrier next concern what effect will have pullout trajectoryor elevation required before commencing pulloutto achieve straight level flight point dOIt think will require much further imagination rec ognize steeper angle des cent still air elevation margin needed safely pull out problem simply pilot aware wind effectse will realize steep dive attitude relative air media model flying Instead pulling out normally straight level flight 30 feete would calm air conditions may likely plowing Continued page 20 18 Model Aviation $ 159~ InCludes shipping Tesas ins dec odd 5 Designed Turnaround Pattern iara Iq____ L_____ MODEL AIRCRAFT P0 Box 1902 GreenViIe TX 75401 214 454-6441 Littlest Miracle Workshop APROFEALTOOL Send25C SUITABLE FOR ALL forcatagog HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Super Joy Stick Sport Pattern Fun Fly Model 6 tradition ugly sticklooks better flies better builds easier costs lesswant 45-602 cycle engines 60-904 cycle engines Span61 Area720 sq Weight5A lbs $7995 SEE YOUR DEALER Try something different all-balsa Deltas Delta Dart KFIR 0 engines Area432 sq Weight4A lbs Kits contain highest quality balsa hardwoods precision machine cut fit FL FLITE LINE PRODUCTS RL 9 Box 437 Lubbock TX 79423 806-795-6483 model runway hes pulling out downwind direction Unless pilot compensates early pullout left immediate sensation model has lost some degree elevator responsiveness lucky will experience following few moments exemplified problem also very similar backside descent downwind loop loop fixed rela tive ground severe wind cases insufficient elevator control available classical Figure 9 results Scale en thusiasts may familiar name Kent Walters let just say very familiar dive maneuver used example wind can affect safety flying Kent well-known Scale contests ver tical dive bombing run performs Dauntless memory serves correctly think last California Nats mid-Seventies Kent made miscalculation plowed runway dont recollect whether downwind dive Lets move category modeling wind always factor during flight namely Control Line models let ter TM Jennings Paducah KY identified potential safety problem store-bought control lines fact two problems found set 60-foot lines came crimped brass tube end-connections First although box marked 050-60 meaning lines 0015 diameter 60 feet long actually 70-foot lines However according Mr Jennings primary serious defect crimps brass tube did secure stainless steel lines lines able pull through Let start addressing serious defect first no excuse manufacturer ship lines crimpedtube end connections dont secure lines CL modelers follow AMA Safety Code would probably discover such problem before flying portion Safety Code refer item No 1 under Control Line states will subject complete control system including safety thong applicable inspection pull test prior flying pull tests required prior flight con test wonder times CL sport modelers perform such test Control Line flier magazine ar rived mailbox because AMA member let suggest take few minutes read what says about pull tests under Control Line General page 17 current 1984-85 AMA rule book Control Line General section rulebook also addresses line length Continued page 127 20 Model Aviation $225 strips$ 145 Add 20% postage APPLIED DESIGN CORP 138 Penn Street El Seeundo CA 90245 Tuned Pipe Connector 4 $950 plus postagel$ California Residents add 6% sales tax No mere blow outs lost pipes ghtly ties dumps r nest uppearonce beets Fits 40 60 engines 800 die 35 ox components compression sea. une silIcone 0 rings ector comes wltb a 0 ring AdditIonal 0 rings moy porcbesed sending e self-addressed stamped envelope S0for 0 ring Pet No 4310173 Type L1 NEW Tuned Pipe Clomps Mochinad fromII $350 Aluminum ond include mounting hardwore Type T-I Please mete aN Howard Power got Idea tore wetar cooled connector developed Type 0-2 has bean running two about two months end far no burned Out staisless steel strep 0 rings other failure Wotch to-it hove original con-15k aluminum hess Adlust nectors wege Price water cooledIS shamed Sri aft exces connecto tubing $ Water cooled connec boats $18 SafetylPreston Continued page 20 paragraph 3 section iage 17 states Lines may stored between flights lengths must measured before official flight also states paragraph 52 length control lines measured center point grip part control han dle device fore-and-aft centerline model So contest flier its likely will measure line lengths prior flight may also elect shorten cut-to-length lines account portion model control handle part measured length Again its sport modeler may surprise didnt check line length got 70-foot lines instead 60-footers did Mr Jen nings can urge check both length strength store-bought control lines June 1984 issue Model Aviation reprinted article club newslet ter concerned kick-back fourstroke engines potential hazard prop flying off happens writer article Orville Mills suggestion club write engine manufacturers recommend put drive pins propeller backplate prevent happening dont know whether club Benton County RC Club Oregon accepted suggestion upon publication June magazine received letter Scott Fahnestock World Engines formed OS four-stroke engines over 060 cid being equipped drive pins During last month received copy another club newsletter containing article drive pins four-strokes sent Bob Angel editor newsletter SAM No 26 Bobs experiences follow Exploding Propellers John Preston Safety editor ModelAviation ran letter June issue fellow having problems hand-starting OS 90 four-cycle seems 90 kick ing back heavily throwing its prop ended up recommending OS put pins through prop similar practice larger engines coincidence 05 90 four-stroke arriving just few days after read took notice examined new engine darned OS hadnt pinned drive washer fast work OS proceeded break having no problems hand-starting anything else until started running faster small 12-in prop turning about 11500 rpm prop literally exploded shattering completely hub piece put mean-looking gash ground directly below other landed about 20 feet away about 20 seconds later day later same thing happened flight landed no part prop left have since read others have same exper ience pinned props removed pins far no problem Inci dentally suspect guy having hand-starting problems getting prop chicken stick beat up may have propping four-cycle wrong direction have follow instructions carefully four-stroke after priming prop clockwise crank hard allow fingers chicken stick slide off blade because fires before TDC top dead CRCFCED UP Get back ho air test Sig fuselage wing kits Sig kits have replacement fuselage end wing kit plus ether kit items repair model including cowls wheel pants turtle decks canopies wire aluminum landing gear decals much much prices see Sig Catalog order send check money order Sig Mtg Co Inc 401-7 So Front St Montezuma IA 50171 Phone 1-800-247-5008 orders within United States esciuding Alaska Hawaii Iowa 515 623-5154 AIU FLYTHE BEST-FLY SIG I] Li [liii WAIU WA ri LU-lU TWU lii U s thrilling spirit flight caught artist Nuts bolts detail com plete pilots expressions Prints Untrained-Framed-Matted Framed Send $200 Redeemable fIrst pur chase 12 page pictorial catalog 40 planes canvas jets November1984 127 Hal Payne Enterprises 1843 W Torrance Blvd Torrance CA 90501 213 320-3063Dealer Inquiries Welcome Shipped ky First Osas mail tar quick dalivary Shipping C1mges Cesmectaree$150 1 Ceneactar mediClemp$150 lOmsp$100 24dosps$150 Addliseal Omopseack$ 30 Satisfaction Guaranteed Money Back NOW Y-FREE STARTING POWER New completely automatic maintenance system field kit starter batteries No run-down batteries undercharged No boiled-dry batteries overcharged No explosive gasses generated No winter storage problems No attention required tronically maintains full charge JUST CONNECT IT FORGET IT Introductory Offer p us CaRaSfl95 1200 Spec fy 120 24 vo Products PO Box 221 Canton SD 57013 605 987-5924 SASE information centerRMcM comes right back starting itself counterclockwise Before beginning discussion latest account four-stroke engine kick back/props/drive-pins etc let make clear possess fourstroke engines advice might offer must come information received others Bobs technique starting four-stroke engine flipping prop backwards clockwise has suggested other readers Ive used myself Tartan engine habit running backwards flipped prop forwards letter Scott Fahne stock produced response ac companied operating instructions 05 FS-90 four-stroke engine two starting techniques de scribed Under heading START ING manufacturer first states advisable use electric starter starting although hand-starting also possible instructions describe both electric starter procedure starting hand-starting procedure latter procedure after engine primed tells ip pro peller clockwise center right blade engine will bounce smartly counter-clockwise direction point ignition expansion charge takes place So back wards technique hand-starting od engine letter Scott Fahnestock enclosed copy Bobs account props exploding requested comments Scotts response following say Harry Roe engine expert broke problem down two parts first has prop itself ap plies engines both two- fourstroke prop nut tightened down wood fibers prop compressed hub actually shrinks vibration starts shake things loose needs tightened down again Harry recommends prop nut tightened before flying season second factor Harry cites pecu liar four-stroke engines Due longer stroke higher compression ratio four-stroke engines sub ject detonation fuel mix too lean rpm too high Detona tion very violent explosion combustion chamber completely breaks down fuel molecules violent piston instead going up over top complete its stroke driven back down driving crankshaft backwards loosening prop Pro longed detonation can cause engine overheat eventually sieze solu tion simple does require some self-restraint Dont lean needle way out modeler wants wring last possible rpm out engine should stick two-stroke engines testing shows four-strokes comfortable 8000 10000 rpm operating range 14 x 9 Davis prop FS-90 peaked 10200 hope helps out Please note sections FS-90 instructions highlighted problem certainly want air outit dangerous engine modeler two highlighted sections instructions accompanied Scotts letter follows First start engine run about 10 seconds needle-valve set 6000/7000 rpm open nee dle-valve reduce speed approximate ly 4000 rpm run 20 seconds cooler setting Keep throttle fully open using needle valve reduce speed Caution close needle valve too lean setting will cause engine overheat slow down Set needle valve very slightly rich side peak rpm setting Make sure engine fully broken-in abouf hour total running time short runs before operating continuously full throttle preceeding information World Engines together conversa tions correspondence owners four-stroke engines leads believe modelers switch two-stroke four-stroke engines need educated CHUCK WOOD ty [lank CIarkCLIPPED WIfsJG AtsJGEL5 ALL RlRTlRL6TI4lS IS 7IT ALSO MEANS SHES NUTSTHESEGLS ONT WASHYHAZEL 5WUl- YOLJE WiVE JUST SELN lNVlTENO lvioR o ARE EMOTIONIALL UNsTA5LE CAN ILJSTFEELTHE WHIZ WHIPTHEM TO JOIN OU FIPS-ri-i-us csiwTHEIR L~TLE HEARTS AREAS THEIR MENTALINTO SHAPE REMEMBER INTERNATIONAL EXPOSITIONOFF LOOKlNFARAWAY FROM HERE AS AM MOTORS AREDR VOLTAGE WARNINGTHAT MEANS TEAM DRILLFOR BOY!FROM NELSON ED-1Vj--~ WAY OFF TIMUSJGAILKP TI-IEM IN LINE FROM NOW ONflS MUCH TOO EARL w. oR i tic 128 Model Aviation IMSeett7 SpenSaaUaepUSA VSr SpenSISrnepUSA ItOt Spa,Sam ppUSA 2rI63 enlpa52550 ppUSA 24I53 SeenSapoeppUSA 2% I94 SpanSanSeppUSA afl IU SpanSUCH ppUSA Fiberliege & Canopies available Send Stamp the detailed Brochures oar Giant Scale Accessories Oar Plane snot PostPaid OOthin USA Nick Zirali 29 Ed9or Delve SniShSown NY 11797 USA operate latter As pre viously stated have no experience tuning four-stroke model engines everything read about procedure points towards too lean needle valve set ting prime cause engine kick back appears top-end rpm four-stroke much less affected changes fuel mixture needle valve set ting two-stroke As result tendency adjust mixture too lean can produce detonation kickback would recommend use tachometer ensure highspeed mixture always set rich side optimum Meanwhile what can about props spinning off breaking kickback should still occur recently received letters two readers both suggested use elastic stop nut retain prop prevent completely detaching crankshaft should engine kick back Jim Weatherly Seattle Radio Aero Club 90 two-stroke engine throw its prop distance about 40 feet prevent future occurrences type uses elastic stop nuts bigger engines letter states nuts metal plastic inserts grip threads kicked loose go about half turn prop free-wheels stop prop shaft other letter came Bill Hoff meister flies Indy R/G South Flying Club previous ly sent picture clubs frequency control board appeared col umn August 1983 issue Bill en closed drawing shows another club member solved prop detachment problem letter follows am member Indy R/G South Flying Club have working fellow flier four-stroke 120 severe problem backfiring causing prop come off him First tried using two prop nuts result didnt help much Second tried four bolts through hub some using now did work time prop split two pieces coming him instead Third went hex Nylok nut Now engine backfires prop slips little nut has retightened still safe AMA safety nut needs drilled counterbored just little less thickness hex Nylok nut helps keep AMA nut locked place fellow flier has prop come off again since used parts like drawing indicates drawing Bills letter refers shown page 16 magazine il lustrates typical assembly using Nylok nut combination AMA safety nut retain prop Note hole drilled prop drive plate pin inserted hold engine crankshaft stationary Nylok AMA nuts tightened As alterna tive hole could mill file wrenching flats drive plate seems elastic stop nut Nylok trade name suggestion simultanteously suggested both Jim Weatherly Bill Hoffmeister may solution prop-breakage/propflying-off type incident Note stated Jim backfires props coming loose arent confined four-stroke engines As contest fliers will probably test happens frequently running out time trying start engine front judges Perhaps some hobby accessory manufac turer should consider producing AMA safety nuts built-in plastic locking inserts Have safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 FunlWinter Continued page 28 fun guys have come full circle limit comments aircraft us have before know will build next year Get away nets What woke up cover Australian magazine Airborne Tom Prossers turnaround model first Id seen sent away plans sure some big engine pipe design big lots area tail-drag ger gear never blind faith trike gears anyway bit dihedral nicelytapered wing proportions could iden tif 40 would safe Falcon 56 Kadetfor loaf-around mood 60 sporty wingovers tame rolls invertedyour basic hacker aerobaticsits speed responses would beyond us sort basic trainer turnaround flying Well seeing things like Flashback Taurus Around 1960 reed systems domi nant Proportional coming Kraft proving its time come Thousands us still counted pennies stuck escapements time family man aged second-hand reed systems good reed fliers capable pulsing simultane ously forest control sticksthere rows sticks Fingers blurred planes could fly proportionally smooth silk needed concert pianist truly didnt control escapement planes commanded ship go certain position its own did commanded maneuver quick blip actuated throttle escapementjust high low signal held Right Two November1984 129
Edition: Model Aviation - 1984/11
Page Numbers: 16, 18, 20, 127, 128, 129
Cdmes Safety ohn Preon First wind still blows models still flybut really know what wind doing flight character istics RC model Understand ing interaction may help avert crash M9re four-stroke-kick back phenome non keep prop coming off WIND revisited August 1984 issue Model Aviation column carried arti cle Tom Bilheimer editor Lehigh Valley RC Society newsletter titled Wind As predicted sParked some letters readers case missed Toms article what basically said wind blowing constant velocity no gusts turbulence does have effect reactions aircraft flight prove point Tom placed imaginary RC pilot aircraft carrier moving down wind same velocity wind other words RC pilot would have sensation no wind Some letter-writers totally disagreed Toms logic attempted prove wrong offering some incorrect logic own However letter well-known Scale builder flier Kent Walters started out saying Toms article uld apparently leave impression no corresponding safety problem aggravated wihd figured knowingly printed article primari ly get some response contrary Well worked Kent hit nail squarely head speak printed article primarily HE DED TO IERT PIN CR TOCL USED TO HD CRAMS-IAFT SEO5E TO TI G-4TEN 1-EX rJYLOK NJr cRANSHAFT ENIE CASTIN3 PR~ because hard up something new talk about and, situations Tom considered didnt say anything isnt true However part fly feet firmly planted ground perform maneu vers models attempt duplicate shown AMA rule book observed someone also firmly planted ground we can run trouble Continued page 18 PRCR z K PRGP WASI-ER cCLIJTEF6C TO FIT 4JT USED AMA SAFETY UT ~7i/1624 rNtOK 1-EX NJT 1/4-28 NYLOK 1-EX rLJT DEPEND N ~J B3 iE 16 Model Aviation Heres use elastic stop nut AMA safety nut crankshaft lithe engine backfires runs backwards stop nut keeps prop flying off QVXP IEEP BUT THIS NEW WIND COMPENSATOR MAKE ME MILLION BUCKS proud have part viuiuiuiniiuiia winning team Reno NATS total 27 out 28 contestants placed top three events used ASTRO MOTORS ASTRO MOTORS used First Second place winners Congratulations NATS winners proud SEVEN CELLSEVEN CELLUNLIMIIIOINDOORINDOOR R/COLDTIMEE/CSAILPUNEEICSAILPEANER/CENDUEM4J1/CECALE lot-SobSijItlee-JohoSrownlOt-SobBoochartot-TonyNacorratolee-AddieNacerreto Flaybny Antro CO 06Elecicon Aetro CO 06Challenger Antro COOSAnno Tortle lAntro 038Farroan Moonlicoe Snore-il 15 winScore 2763Score 2734Score 2800 mm tmo 035 2nd Bob Booth2nd Joho Van Haelo2nd- Bob SuIt2nd-John Evano2nd Mitch Poling Viking Antro CO Oh Electicoa lAatro CO 55 Sononor Aetro CO 15JE-1 lAntro 035 rith Tabloid Score-1O32rnin Scora-2B35 Score-23B2Scoro20S0njn otmoS3h 3rd Angont Fabian 3rd Since MoAvenoc, 3rd John Brown 3rd Tony Nacarrato Flaybny Anon co telito Anon CO Oh Electrico Anon CO SB Goppy Biplane score- tei 00 Scora-2b13 Score-2134 lAntro 020 mi FUONT OASS AElI RIGNI CLASS BFREE MONTINDOORINDOOR SloCiManOnerSIoCelloOLDOIMERCONIROLUNEJRISRCONTROLLINEOPEN lnt-JinrOgglnt-LeonardBodfordlnt-BobMehmnenlnt-Franktlodetlet- Lonardlff SalaBle 380 lAnen CO 06 FAI Ship lAntro CO OhCororont Clipper lAntro 020 Zero Anon 0201 F 4-U lAntmo 0201 Score -680 eec Score- 366 nec 2nd Donald 1-loahee2nd Addie Nacarrato2nd Frank Code2nd John Godel2nd Addle Nacarraro Original Aeon 035 Playboy Anon CO 15 Corontet ClipynrLhaoo03G FSF Anen 020 Bell Bonito A*On 020 Score -426 eecScore 338 nec 3rd Leonard Bedford3rd Tony Nacorrato3rd Robert Mehrrren3rd Tony Nacarrato PAl Ship Anon CO 06 Salelte 380 ILeacra LT-06 F-28 Aeon 036 Salt AD-S Anon 020 Score-t2lnec Score-237nnc L231 1 Beach Ave na Del Roy CA 2 213844j ~LiJULuJftmw W forget about wind effect has model being flown relative ground Rather risk getting trouble using own explanation Ill let Kent Walters take over major flaw Mr Bilheimers logic modelers fly reference air media model flying respect fixed ground position stand maneuvers normally want perform precision will piloted such way try correct wind conditions order prevent distortion maneuver something unrecog nizable corrections imposing control surfaces force model behave would like perceive ground can look quite different dangerous once return exemplified aircraft carrier traveling same speed direction wind flying best way further explain provide example believe can speak some authority longterm experience Suppose wind blowing right left 30 mph model forced vertical dive high altitude front directly above transmitter pilot pilot entered vertical dive going downwind plans pulling out downwind well Keep mind during descent pilot maintains vertical straight-line dive respect fixed position ground thus compensating wind drift point let us observers quick ly return rented carrier travelling same 30 mph speed direction wind cruise along spectator line see just what dive looks like As Mr Bilheimer has correctly pointed out will now experiencing no wind However looking dive maneuver removing reference fixed ground PlOte maneuver no longer appears vertical Instead maneuver looks like model has dived well past vertical descend ing reverse direction its entry respect calm air environment carrier next concern what effect will have pullout trajectoryor elevation required before commencing pulloutto achieve straight level flight point dOIt think will require much further imagination rec ognize steeper angle des cent still air elevation margin needed safely pull out problem simply pilot aware wind effectse will realize steep dive attitude relative air media model flying Instead pulling out normally straight level flight 30 feete would calm air conditions may likely plowing Continued page 20 18 Model Aviation $ 159~ InCludes shipping Tesas ins dec odd 5 Designed Turnaround Pattern iara Iq____ L_____ MODEL AIRCRAFT P0 Box 1902 GreenViIe TX 75401 214 454-6441 Littlest Miracle Workshop APROFEALTOOL Send25C SUITABLE FOR ALL forcatagog HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Super Joy Stick Sport Pattern Fun Fly Model 6 tradition ugly sticklooks better flies better builds easier costs lesswant 45-602 cycle engines 60-904 cycle engines Span61 Area720 sq Weight5A lbs $7995 SEE YOUR DEALER Try something different all-balsa Deltas Delta Dart KFIR 0 engines Area432 sq Weight4A lbs Kits contain highest quality balsa hardwoods precision machine cut fit FL FLITE LINE PRODUCTS RL 9 Box 437 Lubbock TX 79423 806-795-6483 model runway hes pulling out downwind direction Unless pilot compensates early pullout left immediate sensation model has lost some degree elevator responsiveness lucky will experience following few moments exemplified problem also very similar backside descent downwind loop loop fixed rela tive ground severe wind cases insufficient elevator control available classical Figure 9 results Scale en thusiasts may familiar name Kent Walters let just say very familiar dive maneuver used example wind can affect safety flying Kent well-known Scale contests ver tical dive bombing run performs Dauntless memory serves correctly think last California Nats mid-Seventies Kent made miscalculation plowed runway dont recollect whether downwind dive Lets move category modeling wind always factor during flight namely Control Line models let ter TM Jennings Paducah KY identified potential safety problem store-bought control lines fact two problems found set 60-foot lines came crimped brass tube end-connections First although box marked 050-60 meaning lines 0015 diameter 60 feet long actually 70-foot lines However according Mr Jennings primary serious defect crimps brass tube did secure stainless steel lines lines able pull through Let start addressing serious defect first no excuse manufacturer ship lines crimpedtube end connections dont secure lines CL modelers follow AMA Safety Code would probably discover such problem before flying portion Safety Code refer item No 1 under Control Line states will subject complete control system including safety thong applicable inspection pull test prior flying pull tests required prior flight con test wonder times CL sport modelers perform such test Control Line flier magazine ar rived mailbox because AMA member let suggest take few minutes read what says about pull tests under Control Line General page 17 current 1984-85 AMA rule book Control Line General section rulebook also addresses line length Continued page 127 20 Model Aviation $225 strips$ 145 Add 20% postage APPLIED DESIGN CORP 138 Penn Street El Seeundo CA 90245 Tuned Pipe Connector 4 $950 plus postagel$ California Residents add 6% sales tax No mere blow outs lost pipes ghtly ties dumps r nest uppearonce beets Fits 40 60 engines 800 die 35 ox components compression sea. une silIcone 0 rings ector comes wltb a 0 ring AdditIonal 0 rings moy porcbesed sending e self-addressed stamped envelope S0for 0 ring Pet No 4310173 Type L1 NEW Tuned Pipe Clomps Mochinad fromII $350 Aluminum ond include mounting hardwore Type T-I Please mete aN Howard Power got Idea tore wetar cooled connector developed Type 0-2 has bean running two about two months end far no burned Out staisless steel strep 0 rings other failure Wotch to-it hove original con-15k aluminum hess Adlust nectors wege Price water cooledIS shamed Sri aft exces connecto tubing $ Water cooled connec boats $18 SafetylPreston Continued page 20 paragraph 3 section iage 17 states Lines may stored between flights lengths must measured before official flight also states paragraph 52 length control lines measured center point grip part control han dle device fore-and-aft centerline model So contest flier its likely will measure line lengths prior flight may also elect shorten cut-to-length lines account portion model control handle part measured length Again its sport modeler may surprise didnt check line length got 70-foot lines instead 60-footers did Mr Jen nings can urge check both length strength store-bought control lines June 1984 issue Model Aviation reprinted article club newslet ter concerned kick-back fourstroke engines potential hazard prop flying off happens writer article Orville Mills suggestion club write engine manufacturers recommend put drive pins propeller backplate prevent happening dont know whether club Benton County RC Club Oregon accepted suggestion upon publication June magazine received letter Scott Fahnestock World Engines formed OS four-stroke engines over 060 cid being equipped drive pins During last month received copy another club newsletter containing article drive pins four-strokes sent Bob Angel editor newsletter SAM No 26 Bobs experiences follow Exploding Propellers John Preston Safety editor ModelAviation ran letter June issue fellow having problems hand-starting OS 90 four-cycle seems 90 kick ing back heavily throwing its prop ended up recommending OS put pins through prop similar practice larger engines coincidence 05 90 four-stroke arriving just few days after read took notice examined new engine darned OS hadnt pinned drive washer fast work OS proceeded break having no problems hand-starting anything else until started running faster small 12-in prop turning about 11500 rpm prop literally exploded shattering completely hub piece put mean-looking gash ground directly below other landed about 20 feet away about 20 seconds later day later same thing happened flight landed no part prop left have since read others have same exper ience pinned props removed pins far no problem Inci dentally suspect guy having hand-starting problems getting prop chicken stick beat up may have propping four-cycle wrong direction have follow instructions carefully four-stroke after priming prop clockwise crank hard allow fingers chicken stick slide off blade because fires before TDC top dead CRCFCED UP Get back ho air test Sig fuselage wing kits Sig kits have replacement fuselage end wing kit plus ether kit items repair model including cowls wheel pants turtle decks canopies wire aluminum landing gear decals much much prices see Sig Catalog order send check money order Sig Mtg Co Inc 401-7 So Front St Montezuma IA 50171 Phone 1-800-247-5008 orders within United States esciuding Alaska Hawaii Iowa 515 623-5154 AIU FLYTHE BEST-FLY SIG I] Li [liii WAIU WA ri LU-lU TWU lii U s thrilling spirit flight caught artist Nuts bolts detail com plete pilots expressions Prints Untrained-Framed-Matted Framed Send $200 Redeemable fIrst pur chase 12 page pictorial catalog 40 planes canvas jets November1984 127 Hal Payne Enterprises 1843 W Torrance Blvd Torrance CA 90501 213 320-3063Dealer Inquiries Welcome Shipped ky First Osas mail tar quick dalivary Shipping C1mges Cesmectaree$150 1 Ceneactar mediClemp$150 lOmsp$100 24dosps$150 Addliseal Omopseack$ 30 Satisfaction Guaranteed Money Back NOW Y-FREE STARTING POWER New completely automatic maintenance system field kit starter batteries No run-down batteries undercharged No boiled-dry batteries overcharged No explosive gasses generated No winter storage problems No attention required tronically maintains full charge JUST CONNECT IT FORGET IT Introductory Offer p us CaRaSfl95 1200 Spec fy 120 24 vo Products PO Box 221 Canton SD 57013 605 987-5924 SASE information centerRMcM comes right back starting itself counterclockwise Before beginning discussion latest account four-stroke engine kick back/props/drive-pins etc let make clear possess fourstroke engines advice might offer must come information received others Bobs technique starting four-stroke engine flipping prop backwards clockwise has suggested other readers Ive used myself Tartan engine habit running backwards flipped prop forwards letter Scott Fahne stock produced response ac companied operating instructions 05 FS-90 four-stroke engine two starting techniques de scribed Under heading START ING manufacturer first states advisable use electric starter starting although hand-starting also possible instructions describe both electric starter procedure starting hand-starting procedure latter procedure after engine primed tells ip pro peller clockwise center right blade engine will bounce smartly counter-clockwise direction point ignition expansion charge takes place So back wards technique hand-starting od engine letter Scott Fahnestock enclosed copy Bobs account props exploding requested comments Scotts response following say Harry Roe engine expert broke problem down two parts first has prop itself ap plies engines both two- fourstroke prop nut tightened down wood fibers prop compressed hub actually shrinks vibration starts shake things loose needs tightened down again Harry recommends prop nut tightened before flying season second factor Harry cites pecu liar four-stroke engines Due longer stroke higher compression ratio four-stroke engines sub ject detonation fuel mix too lean rpm too high Detona tion very violent explosion combustion chamber completely breaks down fuel molecules violent piston instead going up over top complete its stroke driven back down driving crankshaft backwards loosening prop Pro longed detonation can cause engine overheat eventually sieze solu tion simple does require some self-restraint Dont lean needle way out modeler wants wring last possible rpm out engine should stick two-stroke engines testing shows four-strokes comfortable 8000 10000 rpm operating range 14 x 9 Davis prop FS-90 peaked 10200 hope helps out Please note sections FS-90 instructions highlighted problem certainly want air outit dangerous engine modeler two highlighted sections instructions accompanied Scotts letter follows First start engine run about 10 seconds needle-valve set 6000/7000 rpm open nee dle-valve reduce speed approximate ly 4000 rpm run 20 seconds cooler setting Keep throttle fully open using needle valve reduce speed Caution close needle valve too lean setting will cause engine overheat slow down Set needle valve very slightly rich side peak rpm setting Make sure engine fully broken-in abouf hour total running time short runs before operating continuously full throttle preceeding information World Engines together conversa tions correspondence owners four-stroke engines leads believe modelers switch two-stroke four-stroke engines need educated CHUCK WOOD ty [lank CIarkCLIPPED WIfsJG AtsJGEL5 ALL RlRTlRL6TI4lS IS 7IT ALSO MEANS SHES NUTSTHESEGLS ONT WASHYHAZEL 5WUl- YOLJE WiVE JUST SELN lNVlTENO lvioR o ARE EMOTIONIALL UNsTA5LE CAN ILJSTFEELTHE WHIZ WHIPTHEM TO JOIN OU FIPS-ri-i-us csiwTHEIR L~TLE HEARTS AREAS THEIR MENTALINTO SHAPE REMEMBER INTERNATIONAL EXPOSITIONOFF LOOKlNFARAWAY FROM HERE AS AM MOTORS AREDR VOLTAGE WARNINGTHAT MEANS TEAM DRILLFOR BOY!FROM NELSON ED-1Vj--~ WAY OFF TIMUSJGAILKP TI-IEM IN LINE FROM NOW ONflS MUCH TOO EARL w. oR i tic 128 Model Aviation IMSeett7 SpenSaaUaepUSA VSr SpenSISrnepUSA ItOt Spa,Sam ppUSA 2rI63 enlpa52550 ppUSA 24I53 SeenSapoeppUSA 2% I94 SpanSanSeppUSA afl IU SpanSUCH ppUSA Fiberliege & Canopies available Send Stamp the detailed Brochures oar Giant Scale Accessories Oar Plane snot PostPaid OOthin USA Nick Zirali 29 Ed9or Delve SniShSown NY 11797 USA operate latter As pre viously stated have no experience tuning four-stroke model engines everything read about procedure points towards too lean needle valve set ting prime cause engine kick back appears top-end rpm four-stroke much less affected changes fuel mixture needle valve set ting two-stroke As result tendency adjust mixture too lean can produce detonation kickback would recommend use tachometer ensure highspeed mixture always set rich side optimum Meanwhile what can about props spinning off breaking kickback should still occur recently received letters two readers both suggested use elastic stop nut retain prop prevent completely detaching crankshaft should engine kick back Jim Weatherly Seattle Radio Aero Club 90 two-stroke engine throw its prop distance about 40 feet prevent future occurrences type uses elastic stop nuts bigger engines letter states nuts metal plastic inserts grip threads kicked loose go about half turn prop free-wheels stop prop shaft other letter came Bill Hoff meister flies Indy R/G South Flying Club previous ly sent picture clubs frequency control board appeared col umn August 1983 issue Bill en closed drawing shows another club member solved prop detachment problem letter follows am member Indy R/G South Flying Club have working fellow flier four-stroke 120 severe problem backfiring causing prop come off him First tried using two prop nuts result didnt help much Second tried four bolts through hub some using now did work time prop split two pieces coming him instead Third went hex Nylok nut Now engine backfires prop slips little nut has retightened still safe AMA safety nut needs drilled counterbored just little less thickness hex Nylok nut helps keep AMA nut locked place fellow flier has prop come off again since used parts like drawing indicates drawing Bills letter refers shown page 16 magazine il lustrates typical assembly using Nylok nut combination AMA safety nut retain prop Note hole drilled prop drive plate pin inserted hold engine crankshaft stationary Nylok AMA nuts tightened As alterna tive hole could mill file wrenching flats drive plate seems elastic stop nut Nylok trade name suggestion simultanteously suggested both Jim Weatherly Bill Hoffmeister may solution prop-breakage/propflying-off type incident Note stated Jim backfires props coming loose arent confined four-stroke engines As contest fliers will probably test happens frequently running out time trying start engine front judges Perhaps some hobby accessory manufac turer should consider producing AMA safety nuts built-in plastic locking inserts Have safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 FunlWinter Continued page 28 fun guys have come full circle limit comments aircraft us have before know will build next year Get away nets What woke up cover Australian magazine Airborne Tom Prossers turnaround model first Id seen sent away plans sure some big engine pipe design big lots area tail-drag ger gear never blind faith trike gears anyway bit dihedral nicelytapered wing proportions could iden tif 40 would safe Falcon 56 Kadetfor loaf-around mood 60 sporty wingovers tame rolls invertedyour basic hacker aerobaticsits speed responses would beyond us sort basic trainer turnaround flying Well seeing things like Flashback Taurus Around 1960 reed systems domi nant Proportional coming Kraft proving its time come Thousands us still counted pennies stuck escapements time family man aged second-hand reed systems good reed fliers capable pulsing simultane ously forest control sticksthere rows sticks Fingers blurred planes could fly proportionally smooth silk needed concert pianist truly didnt control escapement planes commanded ship go certain position its own did commanded maneuver quick blip actuated throttle escapementjust high low signal held Right Two November1984 129
Edition: Model Aviation - 1984/11
Page Numbers: 16, 18, 20, 127, 128, 129
Cdmes Safety ohn Preon First wind still blows models still flybut really know what wind doing flight character istics RC model Understand ing interaction may help avert crash M9re four-stroke-kick back phenome non keep prop coming off WIND revisited August 1984 issue Model Aviation column carried arti cle Tom Bilheimer editor Lehigh Valley RC Society newsletter titled Wind As predicted sParked some letters readers case missed Toms article what basically said wind blowing constant velocity no gusts turbulence does have effect reactions aircraft flight prove point Tom placed imaginary RC pilot aircraft carrier moving down wind same velocity wind other words RC pilot would have sensation no wind Some letter-writers totally disagreed Toms logic attempted prove wrong offering some incorrect logic own However letter well-known Scale builder flier Kent Walters started out saying Toms article uld apparently leave impression no corresponding safety problem aggravated wihd figured knowingly printed article primari ly get some response contrary Well worked Kent hit nail squarely head speak printed article primarily HE DED TO IERT PIN CR TOCL USED TO HD CRAMS-IAFT SEO5E TO TI G-4TEN 1-EX rJYLOK NJr cRANSHAFT ENIE CASTIN3 PR~ because hard up something new talk about and, situations Tom considered didnt say anything isnt true However part fly feet firmly planted ground perform maneu vers models attempt duplicate shown AMA rule book observed someone also firmly planted ground we can run trouble Continued page 18 PRCR z K PRGP WASI-ER cCLIJTEF6C TO FIT 4JT USED AMA SAFETY UT ~7i/1624 rNtOK 1-EX NJT 1/4-28 NYLOK 1-EX rLJT DEPEND N ~J B3 iE 16 Model Aviation Heres use elastic stop nut AMA safety nut crankshaft lithe engine backfires runs backwards stop nut keeps prop flying off QVXP IEEP BUT THIS NEW WIND COMPENSATOR MAKE ME MILLION BUCKS proud have part viuiuiuiniiuiia winning team Reno NATS total 27 out 28 contestants placed top three events used ASTRO MOTORS ASTRO MOTORS used First Second place winners Congratulations NATS winners proud SEVEN CELLSEVEN CELLUNLIMIIIOINDOORINDOOR R/COLDTIMEE/CSAILPUNEEICSAILPEANER/CENDUEM4J1/CECALE lot-SobSijItlee-JohoSrownlOt-SobBoochartot-TonyNacorratolee-AddieNacerreto Flaybny Antro CO 06Elecicon Aetro CO 06Challenger Antro COOSAnno Tortle lAntro 038Farroan Moonlicoe Snore-il 15 winScore 2763Score 2734Score 2800 mm tmo 035 2nd Bob Booth2nd Joho Van Haelo2nd- Bob SuIt2nd-John Evano2nd Mitch Poling Viking Antro CO Oh Electicoa lAatro CO 55 Sononor Aetro CO 15JE-1 lAntro 035 rith Tabloid Score-1O32rnin Scora-2B35 Score-23B2Scoro20S0njn otmoS3h 3rd Angont Fabian 3rd Since MoAvenoc, 3rd John Brown 3rd Tony Nacarrato Flaybny Anon co telito Anon CO Oh Electrico Anon CO SB Goppy Biplane score- tei 00 Scora-2b13 Score-2134 lAntro 020 mi FUONT OASS AElI RIGNI CLASS BFREE MONTINDOORINDOOR SloCiManOnerSIoCelloOLDOIMERCONIROLUNEJRISRCONTROLLINEOPEN lnt-JinrOgglnt-LeonardBodfordlnt-BobMehmnenlnt-Franktlodetlet- Lonardlff SalaBle 380 lAnen CO 06 FAI Ship lAntro CO OhCororont Clipper lAntro 020 Zero Anon 0201 F 4-U lAntmo 0201 Score -680 eec Score- 366 nec 2nd Donald 1-loahee2nd Addie Nacarrato2nd Frank Code2nd John Godel2nd Addle Nacarraro Original Aeon 035 Playboy Anon CO 15 Corontet ClipynrLhaoo03G FSF Anen 020 Bell Bonito A*On 020 Score -426 eecScore 338 nec 3rd Leonard Bedford3rd Tony Nacorrato3rd Robert Mehrrren3rd Tony Nacarrato PAl Ship Anon CO 06 Salelte 380 ILeacra LT-06 F-28 Aeon 036 Salt AD-S Anon 020 Score-t2lnec Score-237nnc L231 1 Beach Ave na Del Roy CA 2 213844j ~LiJULuJftmw W forget about wind effect has model being flown relative ground Rather risk getting trouble using own explanation Ill let Kent Walters take over major flaw Mr Bilheimers logic modelers fly reference air media model flying respect fixed ground position stand maneuvers normally want perform precision will piloted such way try correct wind conditions order prevent distortion maneuver something unrecog nizable corrections imposing control surfaces force model behave would like perceive ground can look quite different dangerous once return exemplified aircraft carrier traveling same speed direction wind flying best way further explain provide example believe can speak some authority longterm experience Suppose wind blowing right left 30 mph model forced vertical dive high altitude front directly above transmitter pilot pilot entered vertical dive going downwind plans pulling out downwind well Keep mind during descent pilot maintains vertical straight-line dive respect fixed position ground thus compensating wind drift point let us observers quick ly return rented carrier travelling same 30 mph speed direction wind cruise along spectator line see just what dive looks like As Mr Bilheimer has correctly pointed out will now experiencing no wind However looking dive maneuver removing reference fixed ground PlOte maneuver no longer appears vertical Instead maneuver looks like model has dived well past vertical descend ing reverse direction its entry respect calm air environment carrier next concern what effect will have pullout trajectoryor elevation required before commencing pulloutto achieve straight level flight point dOIt think will require much further imagination rec ognize steeper angle des cent still air elevation margin needed safely pull out problem simply pilot aware wind effectse will realize steep dive attitude relative air media model flying Instead pulling out normally straight level flight 30 feete would calm air conditions may likely plowing Continued page 20 18 Model Aviation $ 159~ InCludes shipping Tesas ins dec odd 5 Designed Turnaround Pattern iara Iq____ L_____ MODEL AIRCRAFT P0 Box 1902 GreenViIe TX 75401 214 454-6441 Littlest Miracle Workshop APROFEALTOOL Send25C SUITABLE FOR ALL forcatagog HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Super Joy Stick Sport Pattern Fun Fly Model 6 tradition ugly sticklooks better flies better builds easier costs lesswant 45-602 cycle engines 60-904 cycle engines Span61 Area720 sq Weight5A lbs $7995 SEE YOUR DEALER Try something different all-balsa Deltas Delta Dart KFIR 0 engines Area432 sq Weight4A lbs Kits contain highest quality balsa hardwoods precision machine cut fit FL FLITE LINE PRODUCTS RL 9 Box 437 Lubbock TX 79423 806-795-6483 model runway hes pulling out downwind direction Unless pilot compensates early pullout left immediate sensation model has lost some degree elevator responsiveness lucky will experience following few moments exemplified problem also very similar backside descent downwind loop loop fixed rela tive ground severe wind cases insufficient elevator control available classical Figure 9 results Scale en thusiasts may familiar name Kent Walters let just say very familiar dive maneuver used example wind can affect safety flying Kent well-known Scale contests ver tical dive bombing run performs Dauntless memory serves correctly think last California Nats mid-Seventies Kent made miscalculation plowed runway dont recollect whether downwind dive Lets move category modeling wind always factor during flight namely Control Line models let ter TM Jennings Paducah KY identified potential safety problem store-bought control lines fact two problems found set 60-foot lines came crimped brass tube end-connections First although box marked 050-60 meaning lines 0015 diameter 60 feet long actually 70-foot lines However according Mr Jennings primary serious defect crimps brass tube did secure stainless steel lines lines able pull through Let start addressing serious defect first no excuse manufacturer ship lines crimpedtube end connections dont secure lines CL modelers follow AMA Safety Code would probably discover such problem before flying portion Safety Code refer item No 1 under Control Line states will subject complete control system including safety thong applicable inspection pull test prior flying pull tests required prior flight con test wonder times CL sport modelers perform such test Control Line flier magazine ar rived mailbox because AMA member let suggest take few minutes read what says about pull tests under Control Line General page 17 current 1984-85 AMA rule book Control Line General section rulebook also addresses line length Continued page 127 20 Model Aviation $225 strips$ 145 Add 20% postage APPLIED DESIGN CORP 138 Penn Street El Seeundo CA 90245 Tuned Pipe Connector 4 $950 plus postagel$ California Residents add 6% sales tax No mere blow outs lost pipes ghtly ties dumps r nest uppearonce beets Fits 40 60 engines 800 die 35 ox components compression sea. une silIcone 0 rings ector comes wltb a 0 ring AdditIonal 0 rings moy porcbesed sending e self-addressed stamped envelope S0for 0 ring Pet No 4310173 Type L1 NEW Tuned Pipe Clomps Mochinad fromII $350 Aluminum ond include mounting hardwore Type T-I Please mete aN Howard Power got Idea tore wetar cooled connector developed Type 0-2 has bean running two about two months end far no burned Out staisless steel strep 0 rings other failure Wotch to-it hove original con-15k aluminum hess Adlust nectors wege Price water cooledIS shamed Sri aft exces connecto tubing $ Water cooled connec boats $18 SafetylPreston Continued page 20 paragraph 3 section iage 17 states Lines may stored between flights lengths must measured before official flight also states paragraph 52 length control lines measured center point grip part control han dle device fore-and-aft centerline model So contest flier its likely will measure line lengths prior flight may also elect shorten cut-to-length lines account portion model control handle part measured length Again its sport modeler may surprise didnt check line length got 70-foot lines instead 60-footers did Mr Jen nings can urge check both length strength store-bought control lines June 1984 issue Model Aviation reprinted article club newslet ter concerned kick-back fourstroke engines potential hazard prop flying off happens writer article Orville Mills suggestion club write engine manufacturers recommend put drive pins propeller backplate prevent happening dont know whether club Benton County RC Club Oregon accepted suggestion upon publication June magazine received letter Scott Fahnestock World Engines formed OS four-stroke engines over 060 cid being equipped drive pins During last month received copy another club newsletter containing article drive pins four-strokes sent Bob Angel editor newsletter SAM No 26 Bobs experiences follow Exploding Propellers John Preston Safety editor ModelAviation ran letter June issue fellow having problems hand-starting OS 90 four-cycle seems 90 kick ing back heavily throwing its prop ended up recommending OS put pins through prop similar practice larger engines coincidence 05 90 four-stroke arriving just few days after read took notice examined new engine darned OS hadnt pinned drive washer fast work OS proceeded break having no problems hand-starting anything else until started running faster small 12-in prop turning about 11500 rpm prop literally exploded shattering completely hub piece put mean-looking gash ground directly below other landed about 20 feet away about 20 seconds later day later same thing happened flight landed no part prop left have since read others have same exper ience pinned props removed pins far no problem Inci dentally suspect guy having hand-starting problems getting prop chicken stick beat up may have propping four-cycle wrong direction have follow instructions carefully four-stroke after priming prop clockwise crank hard allow fingers chicken stick slide off blade because fires before TDC top dead CRCFCED UP Get back ho air test Sig fuselage wing kits Sig kits have replacement fuselage end wing kit plus ether kit items repair model including cowls wheel pants turtle decks canopies wire aluminum landing gear decals much much prices see Sig Catalog order send check money order Sig Mtg Co Inc 401-7 So Front St Montezuma IA 50171 Phone 1-800-247-5008 orders within United States esciuding Alaska Hawaii Iowa 515 623-5154 AIU FLYTHE BEST-FLY SIG I] Li [liii WAIU WA ri LU-lU TWU lii U s thrilling spirit flight caught artist Nuts bolts detail com plete pilots expressions Prints Untrained-Framed-Matted Framed Send $200 Redeemable fIrst pur chase 12 page pictorial catalog 40 planes canvas jets November1984 127 Hal Payne Enterprises 1843 W Torrance Blvd Torrance CA 90501 213 320-3063Dealer Inquiries Welcome Shipped ky First Osas mail tar quick dalivary Shipping C1mges Cesmectaree$150 1 Ceneactar mediClemp$150 lOmsp$100 24dosps$150 Addliseal Omopseack$ 30 Satisfaction Guaranteed Money Back NOW Y-FREE STARTING POWER New completely automatic maintenance system field kit starter batteries No run-down batteries undercharged No boiled-dry batteries overcharged No explosive gasses generated No winter storage problems No attention required tronically maintains full charge JUST CONNECT IT FORGET IT Introductory Offer p us CaRaSfl95 1200 Spec fy 120 24 vo Products PO Box 221 Canton SD 57013 605 987-5924 SASE information centerRMcM comes right back starting itself counterclockwise Before beginning discussion latest account four-stroke engine kick back/props/drive-pins etc let make clear possess fourstroke engines advice might offer must come information received others Bobs technique starting four-stroke engine flipping prop backwards clockwise has suggested other readers Ive used myself Tartan engine habit running backwards flipped prop forwards letter Scott Fahne stock produced response ac companied operating instructions 05 FS-90 four-stroke engine two starting techniques de scribed Under heading START ING manufacturer first states advisable use electric starter starting although hand-starting also possible instructions describe both electric starter procedure starting hand-starting procedure latter procedure after engine primed tells ip pro peller clockwise center right blade engine will bounce smartly counter-clockwise direction point ignition expansion charge takes place So back wards technique hand-starting od engine letter Scott Fahnestock enclosed copy Bobs account props exploding requested comments Scotts response following say Harry Roe engine expert broke problem down two parts first has prop itself ap plies engines both two- fourstroke prop nut tightened down wood fibers prop compressed hub actually shrinks vibration starts shake things loose needs tightened down again Harry recommends prop nut tightened before flying season second factor Harry cites pecu liar four-stroke engines Due longer stroke higher compression ratio four-stroke engines sub ject detonation fuel mix too lean rpm too high Detona tion very violent explosion combustion chamber completely breaks down fuel molecules violent piston instead going up over top complete its stroke driven back down driving crankshaft backwards loosening prop Pro longed detonation can cause engine overheat eventually sieze solu tion simple does require some self-restraint Dont lean needle way out modeler wants wring last possible rpm out engine should stick two-stroke engines testing shows four-strokes comfortable 8000 10000 rpm operating range 14 x 9 Davis prop FS-90 peaked 10200 hope helps out Please note sections FS-90 instructions highlighted problem certainly want air outit dangerous engine modeler two highlighted sections instructions accompanied Scotts letter follows First start engine run about 10 seconds needle-valve set 6000/7000 rpm open nee dle-valve reduce speed approximate ly 4000 rpm run 20 seconds cooler setting Keep throttle fully open using needle valve reduce speed Caution close needle valve too lean setting will cause engine overheat slow down Set needle valve very slightly rich side peak rpm setting Make sure engine fully broken-in abouf hour total running time short runs before operating continuously full throttle preceeding information World Engines together conversa tions correspondence owners four-stroke engines leads believe modelers switch two-stroke four-stroke engines need educated CHUCK WOOD ty [lank CIarkCLIPPED WIfsJG AtsJGEL5 ALL RlRTlRL6TI4lS IS 7IT ALSO MEANS SHES NUTSTHESEGLS ONT WASHYHAZEL 5WUl- YOLJE WiVE JUST SELN lNVlTENO lvioR o ARE EMOTIONIALL UNsTA5LE CAN ILJSTFEELTHE WHIZ WHIPTHEM TO JOIN OU FIPS-ri-i-us csiwTHEIR L~TLE HEARTS AREAS THEIR MENTALINTO SHAPE REMEMBER INTERNATIONAL EXPOSITIONOFF LOOKlNFARAWAY FROM HERE AS AM MOTORS AREDR VOLTAGE WARNINGTHAT MEANS TEAM DRILLFOR BOY!FROM NELSON ED-1Vj--~ WAY OFF TIMUSJGAILKP TI-IEM IN LINE FROM NOW ONflS MUCH TOO EARL w. oR i tic 128 Model Aviation IMSeett7 SpenSaaUaepUSA VSr SpenSISrnepUSA ItOt Spa,Sam ppUSA 2rI63 enlpa52550 ppUSA 24I53 SeenSapoeppUSA 2% I94 SpanSanSeppUSA afl IU SpanSUCH ppUSA Fiberliege & Canopies available Send Stamp the detailed Brochures oar Giant Scale Accessories Oar Plane snot PostPaid OOthin USA Nick Zirali 29 Ed9or Delve SniShSown NY 11797 USA operate latter As pre viously stated have no experience tuning four-stroke model engines everything read about procedure points towards too lean needle valve set ting prime cause engine kick back appears top-end rpm four-stroke much less affected changes fuel mixture needle valve set ting two-stroke As result tendency adjust mixture too lean can produce detonation kickback would recommend use tachometer ensure highspeed mixture always set rich side optimum Meanwhile what can about props spinning off breaking kickback should still occur recently received letters two readers both suggested use elastic stop nut retain prop prevent completely detaching crankshaft should engine kick back Jim Weatherly Seattle Radio Aero Club 90 two-stroke engine throw its prop distance about 40 feet prevent future occurrences type uses elastic stop nuts bigger engines letter states nuts metal plastic inserts grip threads kicked loose go about half turn prop free-wheels stop prop shaft other letter came Bill Hoff meister flies Indy R/G South Flying Club previous ly sent picture clubs frequency control board appeared col umn August 1983 issue Bill en closed drawing shows another club member solved prop detachment problem letter follows am member Indy R/G South Flying Club have working fellow flier four-stroke 120 severe problem backfiring causing prop come off him First tried using two prop nuts result didnt help much Second tried four bolts through hub some using now did work time prop split two pieces coming him instead Third went hex Nylok nut Now engine backfires prop slips little nut has retightened still safe AMA safety nut needs drilled counterbored just little less thickness hex Nylok nut helps keep AMA nut locked place fellow flier has prop come off again since used parts like drawing indicates drawing Bills letter refers shown page 16 magazine il lustrates typical assembly using Nylok nut combination AMA safety nut retain prop Note hole drilled prop drive plate pin inserted hold engine crankshaft stationary Nylok AMA nuts tightened As alterna tive hole could mill file wrenching flats drive plate seems elastic stop nut Nylok trade name suggestion simultanteously suggested both Jim Weatherly Bill Hoffmeister may solution prop-breakage/propflying-off type incident Note stated Jim backfires props coming loose arent confined four-stroke engines As contest fliers will probably test happens frequently running out time trying start engine front judges Perhaps some hobby accessory manufac turer should consider producing AMA safety nuts built-in plastic locking inserts Have safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 FunlWinter Continued page 28 fun guys have come full circle limit comments aircraft us have before know will build next year Get away nets What woke up cover Australian magazine Airborne Tom Prossers turnaround model first Id seen sent away plans sure some big engine pipe design big lots area tail-drag ger gear never blind faith trike gears anyway bit dihedral nicelytapered wing proportions could iden tif 40 would safe Falcon 56 Kadetfor loaf-around mood 60 sporty wingovers tame rolls invertedyour basic hacker aerobaticsits speed responses would beyond us sort basic trainer turnaround flying Well seeing things like Flashback Taurus Around 1960 reed systems domi nant Proportional coming Kraft proving its time come Thousands us still counted pennies stuck escapements time family man aged second-hand reed systems good reed fliers capable pulsing simultane ously forest control sticksthere rows sticks Fingers blurred planes could fly proportionally smooth silk needed concert pianist truly didnt control escapement planes commanded ship go certain position its own did commanded maneuver quick blip actuated throttle escapementjust high low signal held Right Two November1984 129
Edition: Model Aviation - 1984/11
Page Numbers: 16, 18, 20, 127, 128, 129
Cdmes Safety ohn Preon First wind still blows models still flybut really know what wind doing flight character istics RC model Understand ing interaction may help avert crash M9re four-stroke-kick back phenome non keep prop coming off WIND revisited August 1984 issue Model Aviation column carried arti cle Tom Bilheimer editor Lehigh Valley RC Society newsletter titled Wind As predicted sParked some letters readers case missed Toms article what basically said wind blowing constant velocity no gusts turbulence does have effect reactions aircraft flight prove point Tom placed imaginary RC pilot aircraft carrier moving down wind same velocity wind other words RC pilot would have sensation no wind Some letter-writers totally disagreed Toms logic attempted prove wrong offering some incorrect logic own However letter well-known Scale builder flier Kent Walters started out saying Toms article uld apparently leave impression no corresponding safety problem aggravated wihd figured knowingly printed article primari ly get some response contrary Well worked Kent hit nail squarely head speak printed article primarily HE DED TO IERT PIN CR TOCL USED TO HD CRAMS-IAFT SEO5E TO TI G-4TEN 1-EX rJYLOK NJr cRANSHAFT ENIE CASTIN3 PR~ because hard up something new talk about and, situations Tom considered didnt say anything isnt true However part fly feet firmly planted ground perform maneu vers models attempt duplicate shown AMA rule book observed someone also firmly planted ground we can run trouble Continued page 18 PRCR z K PRGP WASI-ER cCLIJTEF6C TO FIT 4JT USED AMA SAFETY UT ~7i/1624 rNtOK 1-EX NJT 1/4-28 NYLOK 1-EX rLJT DEPEND N ~J B3 iE 16 Model Aviation Heres use elastic stop nut AMA safety nut crankshaft lithe engine backfires runs backwards stop nut keeps prop flying off QVXP IEEP BUT THIS NEW WIND COMPENSATOR MAKE ME MILLION BUCKS proud have part viuiuiuiniiuiia winning team Reno NATS total 27 out 28 contestants placed top three events used ASTRO MOTORS ASTRO MOTORS used First Second place winners Congratulations NATS winners proud SEVEN CELLSEVEN CELLUNLIMIIIOINDOORINDOOR R/COLDTIMEE/CSAILPUNEEICSAILPEANER/CENDUEM4J1/CECALE lot-SobSijItlee-JohoSrownlOt-SobBoochartot-TonyNacorratolee-AddieNacerreto Flaybny Antro CO 06Elecicon Aetro CO 06Challenger Antro COOSAnno Tortle lAntro 038Farroan Moonlicoe Snore-il 15 winScore 2763Score 2734Score 2800 mm tmo 035 2nd Bob Booth2nd Joho Van Haelo2nd- Bob SuIt2nd-John Evano2nd Mitch Poling Viking Antro CO Oh Electicoa lAatro CO 55 Sononor Aetro CO 15JE-1 lAntro 035 rith Tabloid Score-1O32rnin Scora-2B35 Score-23B2Scoro20S0njn otmoS3h 3rd Angont Fabian 3rd Since MoAvenoc, 3rd John Brown 3rd Tony Nacarrato Flaybny Anon co telito Anon CO Oh Electrico Anon CO SB Goppy Biplane score- tei 00 Scora-2b13 Score-2134 lAntro 020 mi FUONT OASS AElI RIGNI CLASS BFREE MONTINDOORINDOOR SloCiManOnerSIoCelloOLDOIMERCONIROLUNEJRISRCONTROLLINEOPEN lnt-JinrOgglnt-LeonardBodfordlnt-BobMehmnenlnt-Franktlodetlet- Lonardlff SalaBle 380 lAnen CO 06 FAI Ship lAntro CO OhCororont Clipper lAntro 020 Zero Anon 0201 F 4-U lAntmo 0201 Score -680 eec Score- 366 nec 2nd Donald 1-loahee2nd Addie Nacarrato2nd Frank Code2nd John Godel2nd Addle Nacarraro Original Aeon 035 Playboy Anon CO 15 Corontet ClipynrLhaoo03G FSF Anen 020 Bell Bonito A*On 020 Score -426 eecScore 338 nec 3rd Leonard Bedford3rd Tony Nacorrato3rd Robert Mehrrren3rd Tony Nacarrato PAl Ship Anon CO 06 Salelte 380 ILeacra LT-06 F-28 Aeon 036 Salt AD-S Anon 020 Score-t2lnec Score-237nnc L231 1 Beach Ave na Del Roy CA 2 213844j ~LiJULuJftmw W forget about wind effect has model being flown relative ground Rather risk getting trouble using own explanation Ill let Kent Walters take over major flaw Mr Bilheimers logic modelers fly reference air media model flying respect fixed ground position stand maneuvers normally want perform precision will piloted such way try correct wind conditions order prevent distortion maneuver something unrecog nizable corrections imposing control surfaces force model behave would like perceive ground can look quite different dangerous once return exemplified aircraft carrier traveling same speed direction wind flying best way further explain provide example believe can speak some authority longterm experience Suppose wind blowing right left 30 mph model forced vertical dive high altitude front directly above transmitter pilot pilot entered vertical dive going downwind plans pulling out downwind well Keep mind during descent pilot maintains vertical straight-line dive respect fixed position ground thus compensating wind drift point let us observers quick ly return rented carrier travelling same 30 mph speed direction wind cruise along spectator line see just what dive looks like As Mr Bilheimer has correctly pointed out will now experiencing no wind However looking dive maneuver removing reference fixed ground PlOte maneuver no longer appears vertical Instead maneuver looks like model has dived well past vertical descend ing reverse direction its entry respect calm air environment carrier next concern what effect will have pullout trajectoryor elevation required before commencing pulloutto achieve straight level flight point dOIt think will require much further imagination rec ognize steeper angle des cent still air elevation margin needed safely pull out problem simply pilot aware wind effectse will realize steep dive attitude relative air media model flying Instead pulling out normally straight level flight 30 feete would calm air conditions may likely plowing Continued page 20 18 Model Aviation $ 159~ InCludes shipping Tesas ins dec odd 5 Designed Turnaround Pattern iara Iq____ L_____ MODEL AIRCRAFT P0 Box 1902 GreenViIe TX 75401 214 454-6441 Littlest Miracle Workshop APROFEALTOOL Send25C SUITABLE FOR ALL forcatagog HOBBIES AND CRAFTS Makers of. Mini-Glue Tips Stray- Tray Tee Bar Mini-Saw juff-Stuff & Jewel Stripes Super Joy Stick Sport Pattern Fun Fly Model 6 tradition ugly sticklooks better flies better builds easier costs lesswant 45-602 cycle engines 60-904 cycle engines Span61 Area720 sq Weight5A lbs $7995 SEE YOUR DEALER Try something different all-balsa Deltas Delta Dart KFIR 0 engines Area432 sq Weight4A lbs Kits contain highest quality balsa hardwoods precision machine cut fit FL FLITE LINE PRODUCTS RL 9 Box 437 Lubbock TX 79423 806-795-6483 model runway hes pulling out downwind direction Unless pilot compensates early pullout left immediate sensation model has lost some degree elevator responsiveness lucky will experience following few moments exemplified problem also very similar backside descent downwind loop loop fixed rela tive ground severe wind cases insufficient elevator control available classical Figure 9 results Scale en thusiasts may familiar name Kent Walters let just say very familiar dive maneuver used example wind can affect safety flying Kent well-known Scale contests ver tical dive bombing run performs Dauntless memory serves correctly think last California Nats mid-Seventies Kent made miscalculation plowed runway dont recollect whether downwind dive Lets move category modeling wind always factor during flight namely Control Line models let ter TM Jennings Paducah KY identified potential safety problem store-bought control lines fact two problems found set 60-foot lines came crimped brass tube end-connections First although box marked 050-60 meaning lines 0015 diameter 60 feet long actually 70-foot lines However according Mr Jennings primary serious defect crimps brass tube did secure stainless steel lines lines able pull through Let start addressing serious defect first no excuse manufacturer ship lines crimpedtube end connections dont secure lines CL modelers follow AMA Safety Code would probably discover such problem before flying portion Safety Code refer item No 1 under Control Line states will subject complete control system including safety thong applicable inspection pull test prior flying pull tests required prior flight con test wonder times CL sport modelers perform such test Control Line flier magazine ar rived mailbox because AMA member let suggest take few minutes read what says about pull tests under Control Line General page 17 current 1984-85 AMA rule book Control Line General section rulebook also addresses line length Continued page 127 20 Model Aviation $225 strips$ 145 Add 20% postage APPLIED DESIGN CORP 138 Penn Street El Seeundo CA 90245 Tuned Pipe Connector 4 $950 plus postagel$ California Residents add 6% sales tax No mere blow outs lost pipes ghtly ties dumps r nest uppearonce beets Fits 40 60 engines 800 die 35 ox components compression sea. une silIcone 0 rings ector comes wltb a 0 ring AdditIonal 0 rings moy porcbesed sending e self-addressed stamped envelope S0for 0 ring Pet No 4310173 Type L1 NEW Tuned Pipe Clomps Mochinad fromII $350 Aluminum ond include mounting hardwore Type T-I Please mete aN Howard Power got Idea tore wetar cooled connector developed Type 0-2 has bean running two about two months end far no burned Out staisless steel strep 0 rings other failure Wotch to-it hove original con-15k aluminum hess Adlust nectors wege Price water cooledIS shamed Sri aft exces connecto tubing $ Water cooled connec boats $18 SafetylPreston Continued page 20 paragraph 3 section iage 17 states Lines may stored between flights lengths must measured before official flight also states paragraph 52 length control lines measured center point grip part control han dle device fore-and-aft centerline model So contest flier its likely will measure line lengths prior flight may also elect shorten cut-to-length lines account portion model control handle part measured length Again its sport modeler may surprise didnt check line length got 70-foot lines instead 60-footers did Mr Jen nings can urge check both length strength store-bought control lines June 1984 issue Model Aviation reprinted article club newslet ter concerned kick-back fourstroke engines potential hazard prop flying off happens writer article Orville Mills suggestion club write engine manufacturers recommend put drive pins propeller backplate prevent happening dont know whether club Benton County RC Club Oregon accepted suggestion upon publication June magazine received letter Scott Fahnestock World Engines formed OS four-stroke engines over 060 cid being equipped drive pins During last month received copy another club newsletter containing article drive pins four-strokes sent Bob Angel editor newsletter SAM No 26 Bobs experiences follow Exploding Propellers John Preston Safety editor ModelAviation ran letter June issue fellow having problems hand-starting OS 90 four-cycle seems 90 kick ing back heavily throwing its prop ended up recommending OS put pins through prop similar practice larger engines coincidence 05 90 four-stroke arriving just few days after read took notice examined new engine darned OS hadnt pinned drive washer fast work OS proceeded break having no problems hand-starting anything else until started running faster small 12-in prop turning about 11500 rpm prop literally exploded shattering completely hub piece put mean-looking gash ground directly below other landed about 20 feet away about 20 seconds later day later same thing happened flight landed no part prop left have since read others have same exper ience pinned props removed pins far no problem Inci dentally suspect guy having hand-starting problems getting prop chicken stick beat up may have propping four-cycle wrong direction have follow instructions carefully four-stroke after priming prop clockwise crank hard allow fingers chicken stick slide off blade because fires before TDC top dead CRCFCED UP Get back ho air test Sig fuselage wing kits Sig kits have replacement fuselage end wing kit plus ether kit items repair model including cowls wheel pants turtle decks canopies wire aluminum landing gear decals much much prices see Sig Catalog order send check money order Sig Mtg Co Inc 401-7 So Front St Montezuma IA 50171 Phone 1-800-247-5008 orders within United States esciuding Alaska Hawaii Iowa 515 623-5154 AIU FLYTHE BEST-FLY SIG I] Li [liii WAIU WA ri LU-lU TWU lii U s thrilling spirit flight caught artist Nuts bolts detail com plete pilots expressions Prints Untrained-Framed-Matted Framed Send $200 Redeemable fIrst pur chase 12 page pictorial catalog 40 planes canvas jets November1984 127 Hal Payne Enterprises 1843 W Torrance Blvd Torrance CA 90501 213 320-3063Dealer Inquiries Welcome Shipped ky First Osas mail tar quick dalivary Shipping C1mges Cesmectaree$150 1 Ceneactar mediClemp$150 lOmsp$100 24dosps$150 Addliseal Omopseack$ 30 Satisfaction Guaranteed Money Back NOW Y-FREE STARTING POWER New completely automatic maintenance system field kit starter batteries No run-down batteries undercharged No boiled-dry batteries overcharged No explosive gasses generated No winter storage problems No attention required tronically maintains full charge JUST CONNECT IT FORGET IT Introductory Offer p us CaRaSfl95 1200 Spec fy 120 24 vo Products PO Box 221 Canton SD 57013 605 987-5924 SASE information centerRMcM comes right back starting itself counterclockwise Before beginning discussion latest account four-stroke engine kick back/props/drive-pins etc let make clear possess fourstroke engines advice might offer must come information received others Bobs technique starting four-stroke engine flipping prop backwards clockwise has suggested other readers Ive used myself Tartan engine habit running backwards flipped prop forwards letter Scott Fahne stock produced response ac companied operating instructions 05 FS-90 four-stroke engine two starting techniques de scribed Under heading START ING manufacturer first states advisable use electric starter starting although hand-starting also possible instructions describe both electric starter procedure starting hand-starting procedure latter procedure after engine primed tells ip pro peller clockwise center right blade engine will bounce smartly counter-clockwise direction point ignition expansion charge takes place So back wards technique hand-starting od engine letter Scott Fahnestock enclosed copy Bobs account props exploding requested comments Scotts response following say Harry Roe engine expert broke problem down two parts first has prop itself ap plies engines both two- fourstroke prop nut tightened down wood fibers prop compressed hub actually shrinks vibration starts shake things loose needs tightened down again Harry recommends prop nut tightened before flying season second factor Harry cites pecu liar four-stroke engines Due longer stroke higher compression ratio four-stroke engines sub ject detonation fuel mix too lean rpm too high Detona tion very violent explosion combustion chamber completely breaks down fuel molecules violent piston instead going up over top complete its stroke driven back down driving crankshaft backwards loosening prop Pro longed detonation can cause engine overheat eventually sieze solu tion simple does require some self-restraint Dont lean needle way out modeler wants wring last possible rpm out engine should stick two-stroke engines testing shows four-strokes comfortable 8000 10000 rpm operating range 14 x 9 Davis prop FS-90 peaked 10200 hope helps out Please note sections FS-90 instructions highlighted problem certainly want air outit dangerous engine modeler two highlighted sections instructions accompanied Scotts letter follows First start engine run about 10 seconds needle-valve set 6000/7000 rpm open nee dle-valve reduce speed approximate ly 4000 rpm run 20 seconds cooler setting Keep throttle fully open using needle valve reduce speed Caution close needle valve too lean setting will cause engine overheat slow down Set needle valve very slightly rich side peak rpm setting Make sure engine fully broken-in abouf hour total running time short runs before operating continuously full throttle preceeding information World Engines together conversa tions correspondence owners four-stroke engines leads believe modelers switch two-stroke four-stroke engines need educated CHUCK WOOD ty [lank CIarkCLIPPED WIfsJG AtsJGEL5 ALL RlRTlRL6TI4lS IS 7IT ALSO MEANS SHES NUTSTHESEGLS ONT WASHYHAZEL 5WUl- YOLJE WiVE JUST SELN lNVlTENO lvioR o ARE EMOTIONIALL UNsTA5LE CAN ILJSTFEELTHE WHIZ WHIPTHEM TO JOIN OU FIPS-ri-i-us csiwTHEIR L~TLE HEARTS AREAS THEIR MENTALINTO SHAPE REMEMBER INTERNATIONAL EXPOSITIONOFF LOOKlNFARAWAY FROM HERE AS AM MOTORS AREDR VOLTAGE WARNINGTHAT MEANS TEAM DRILLFOR BOY!FROM NELSON ED-1Vj--~ WAY OFF TIMUSJGAILKP TI-IEM IN LINE FROM NOW ONflS MUCH TOO EARL w. oR i tic 128 Model Aviation IMSeett7 SpenSaaUaepUSA VSr SpenSISrnepUSA ItOt Spa,Sam ppUSA 2rI63 enlpa52550 ppUSA 24I53 SeenSapoeppUSA 2% I94 SpanSanSeppUSA afl IU SpanSUCH ppUSA Fiberliege & Canopies available Send Stamp the detailed Brochures oar Giant Scale Accessories Oar Plane snot PostPaid OOthin USA Nick Zirali 29 Ed9or Delve SniShSown NY 11797 USA operate latter As pre viously stated have no experience tuning four-stroke model engines everything read about procedure points towards too lean needle valve set ting prime cause engine kick back appears top-end rpm four-stroke much less affected changes fuel mixture needle valve set ting two-stroke As result tendency adjust mixture too lean can produce detonation kickback would recommend use tachometer ensure highspeed mixture always set rich side optimum Meanwhile what can about props spinning off breaking kickback should still occur recently received letters two readers both suggested use elastic stop nut retain prop prevent completely detaching crankshaft should engine kick back Jim Weatherly Seattle Radio Aero Club 90 two-stroke engine throw its prop distance about 40 feet prevent future occurrences type uses elastic stop nuts bigger engines letter states nuts metal plastic inserts grip threads kicked loose go about half turn prop free-wheels stop prop shaft other letter came Bill Hoff meister flies Indy R/G South Flying Club previous ly sent picture clubs frequency control board appeared col umn August 1983 issue Bill en closed drawing shows another club member solved prop detachment problem letter follows am member Indy R/G South Flying Club have working fellow flier four-stroke 120 severe problem backfiring causing prop come off him First tried using two prop nuts result didnt help much Second tried four bolts through hub some using now did work time prop split two pieces coming him instead Third went hex Nylok nut Now engine backfires prop slips little nut has retightened still safe AMA safety nut needs drilled counterbored just little less thickness hex Nylok nut helps keep AMA nut locked place fellow flier has prop come off again since used parts like drawing indicates drawing Bills letter refers shown page 16 magazine il lustrates typical assembly using Nylok nut combination AMA safety nut retain prop Note hole drilled prop drive plate pin inserted hold engine crankshaft stationary Nylok AMA nuts tightened As alterna tive hole could mill file wrenching flats drive plate seems elastic stop nut Nylok trade name suggestion simultanteously suggested both Jim Weatherly Bill Hoffmeister may solution prop-breakage/propflying-off type incident Note stated Jim backfires props coming loose arent confined four-stroke engines As contest fliers will probably test happens frequently running out time trying start engine front judges Perhaps some hobby accessory manufac turer should consider producing AMA safety nuts built-in plastic locking inserts Have safe month John Preston 12235 Tilden wood Dr Rockville MD 20852 FunlWinter Continued page 28 fun guys have come full circle limit comments aircraft us have before know will build next year Get away nets What woke up cover Australian magazine Airborne Tom Prossers turnaround model first Id seen sent away plans sure some big engine pipe design big lots area tail-drag ger gear never blind faith trike gears anyway bit dihedral nicelytapered wing proportions could iden tif 40 would safe Falcon 56 Kadetfor loaf-around mood 60 sporty wingovers tame rolls invertedyour basic hacker aerobaticsits speed responses would beyond us sort basic trainer turnaround flying Well seeing things like Flashback Taurus Around 1960 reed systems domi nant Proportional coming Kraft proving its time come Thousands us still counted pennies stuck escapements time family man aged second-hand reed systems good reed fliers capable pulsing simultane ously forest control sticksthere rows sticks Fingers blurred planes could fly proportionally smooth silk needed concert pianist truly didnt control escapement planes commanded ship go certain position its own did commanded maneuver quick blip actuated throttle escapementjust high low signal held Right Two November1984 129