Free Flight DURA TION Bob Meuser THE MONTREAL STOP Its funny go 10 years anyone mentioning particular subject get three letters same mail asking about So has Montreal stop version Montreal stop shown drawing developed Roger Gregory Wakefield Rubber model Roger has similar much lighter versionit uses bent sheetaluminum hub rather milled-out bar stock Helicopt wtogyn nitho nched Rubber nce ne er Speed Rubber -power Di Vlaxer Rubber Mulvihill models blade attachment Roger has using years has proven reliable Roger says whole shebang can made electric drill hand tools us might have bit difficulty doing way basic Montreal stop features Rogers however can readily adapted bar-stock hub sold NFFS Supplies Montreal stop features Gregorys version stick pretty closely original ones appeared early Sixties dont know name comes Ive heard said really invented Los Angeles According Free Flight News England device subject patent filed USSR 1978 Darn weve scooped again Most readers must familiar classic tension stop used Rubber models since early Thirties pin sticking out back nose plug engages arm extending prop shaft prop shaft free slide fore aft through prop hub spring-loaded forward against tension rubber motor ec/v GT Aua 9 5ocAE7$ -IA TCA O/LL5 W/ ri-i F/A-7z/dee BLAL &dEC/-/ D6kVLL 4/ALL 4L TUBING SLIT TZI&/NG 6s/o6 7e2 Gg/ 72 WOV - 5QLOQ aEA5s S IL VEjEPcA5IN cve EeW/EE 7 Y9 AL SA &/ANee SEA 5 WA 5AE' e eV05 A-tA C19/N~C AL CLAA-1 kI-$7W CA 5GdE 77/S CAAJ ALL &e DcNe 14//7Y-/ LeTC7 L2eILL # C67ZeYT57-y~ 5Ae/NG As C/L S Heres Montreal atop Wakefield Bob describes works column thought Rubber models simple 66 Model Aviation Four-Vear-Ola Idarnan Larrer meets mild success VTOing Square OneNo 1 Jack Carters Seven Steps Microfilm series Dick Smith powers Country Boy Fox Combat Special helped Boys designer Jim Clem develop model Larry Kruse photo 5pinncr Startcr modified device once tension rubber motor drops below certain point prop shaft brought dead stop preventing motor going completely slack flopping around allowing prop freewheel fold according its nature essential feature Montreal stop point prop shaft becomes locked depends torque rubber motor rather its tension Further once prop has stopped stays way tension-stop designs isnt true Another feature found true Montreal stop devices locking pin prevents prop rotating after motor wound until f Stnner flier decides time launch operating sequence goes like After motor has wound stop pin right side Rogers drawing pulled out force produced end L-shaped part prop shaft motor torque combined friction holds pin out until motor torque slacks off point spring pushes pin Continued page 158 Hemember tne photo ot urocoolle moryo nourance mooei teatured April issue nose art intrigued Doug Dahike thought hed try little own neatly-executed Sweepette HIG July 198267 John Blair prepares launch oupe de yule Huboer moocH ns Blue Ridge kit Photo Paul Clark Charles McCutcheons method aligns electric starter engine smooth operation Ate-rnativ& BUILT UP AND READY-TO-FLY Higgins Contempo CAP 20L 81 Span & Christen Eagle II 69 Span Write Call Construction Methods Technical Information D R HIGGINS & ASSOCIATES 25403 Via Impresso Valencia CA 91355 Phone 805 254-3017 * Aerocommander SHRIKE 15 ft wingspan Ohio Superstar * *3rd Annual * Hall Fame Giant Plane Fly-In y 17 8- 18 Canton R/C Club field- * The Best GIANT uncontests area * *For Details contact *Bob CampbellSteak fry Saturday night *706 Easton NCanton OH 44720Camping Motels *216-499-5323Refreshments field r " K P P PFFP block right No downthrust needed has built design Gradually build up turns until reach 350 400 maximum safe limit turns can increased rubber stretched helper holding firmly nose hand loosely around rubber can catch it should break burst motor can lot damage covering model should climb too steeply after gentle start hand shim up front tail sliver balsa paper adding necessary Should descend steeply shim up trailing edge tail expect flights longer 30 40 seconds that has designed will riseoff-ground smooth patch quite nicely fun see tail come up gentle climb very docile Much help given late Glen Sigafoose sent propellers rubber power U 0 ow U U1/20 TH SCALE XCUMENTAK OF NOTABLE FAIRCHILDS TA2VDWGS GEORGE H CLAPP CENTRAL SOUAIIE NY /3036I INFO 2100 -REFUNDED WITH ORDERS hundred Marissas Bob Peck Peck-Polymers Frank Zaic also contributed project FF Duration/Meuser Continued jaqe 67 rearward allowing engage hole nose block beginning sound about exciting patent application Also after winding locking pin left side Rogers drawing pushed hole nose block prop allowed rotate torque until pin locks release locking pin flier rotates prop against torque allowing spring push pin out spring wire tubing sizes have carefully worked out can probably adap ted hub choice Rogers entire design bit beyond shop facilities Note forward hole locking pin 3/32 diameter rearward 1/16 stop pin hole sizes reversed Easy-does-it engine starter received fol lowing note Charles McCutcheon Back working Glowdriver introduction electric starters amazed people would use anything brutal deli cate models starter well-aligned engine operation smooth alignment bad starter thrashes around tries tear engine out airplane fitted starter -in diameter aligning pin drilled -in hole end spinner see sketch alignment took care itself opera tion always very smooth spinner shaped thus alternative spinner sketch aligning pin would easily find hole doubt would increase drag much product review product review product review two interesting new models glider fans among us Soarer Two-Meter design offers some inter esting aerodynamics all-wood kit featuring bolt-on wing tail simple efficient spoilers Fuse sides onepiece light plyforduability Soarer can flown two three channels flown two three channels deluxe kit complete vac-formed clear canopy tow hook rudder elevator pushrods spoiler actuators Retail price $4495 less ambitious want get out fly Mid wests latest all-foam critter called Lazy Bird first-time builder will like easy assembly bolt-on wing reinforced top-and-bottom spars spacious fuse plywood spine built-in towhook skid experienced pilotwill appre ciate flight characteristics its said fly just well wooden model Thorough step-by-step instructions included Lazy Bird will have merit beginners kit since Sailplanes aregener ally easier fly powered planes especially dont have expert help Lazy Bird requires two-channel radio retails $5995 product review product review product review 1 58 Model Aviation IROWN A23 0-2w ~TINY PEANUT CO-2 ENGINEHE ENGINECHARGER COMPLETE CATALOG $100 PHONE 714 469-8875 o 442 4836 Peck-P Iyfues W BOX 249R -MA LA MESA CALIF 92041 Soarer Lazy Bird Sailplanes Midwest Products Co 400 5 Indiana St Hobart IN 46432 BALSA SHEETS 36 1/16210pk290 3/32210p5358 1/8s210p5385 3/16n210pk435 1/4210pk499 1/16310pSI330 3/32 3 10 pk390 1/8 310 pk480 3/1635pSI275 1/4 n3 5 pS325 5/16 3 5 pSI380 3/8 3 5 pk395 1/2 3 5 pk495 3/4n3 29k280 1 n32 SkI350 1/16 n4 10 pk520 3/32 4 5 pk315 1/8 n45pk360 3/16 n45pk415 1/4 45pSi495 LIGHT 4 6 LB 36 1/163lOpk430 3/32310 pS490 1/9310 pk560 3/16x 35 pk325 1/435 p5375 3/835 pk495 1/235 pk599 MATCHED SHEETS 42 3/32 4 4 pk399 1/944pk429 3/16 44pk459 1/4 44pk499 BALSA SHEETS 48 1/16310 pk440 3/32310 pk515 1/83 10 pSI 635 3/1635 pSI369 1/435 pk425 3/835 951556 1/234 pSI560 1164lOpS660 3/32s45pk419 l/8s45pk475 3/16 45pk547 1/4s45pk600 TRAILING EDGE 36 1416pk200 5/161-1/48pk250 3/81-1/216pk299 1/2 2 4 pk299 BALSA SHEETS 30~ 1/16310pk275 3/32310Ek325 1/83 10 Ek405 1/16n4lOpk200 3/32410pk504 BALSA TRIANGLES 36 1/41/4109k250 3/63/B10pk320 1/21/210pk430 3/4 3/45 ELI209 11Spk275 1/8410 pk590 BALSASTICKS 39~ 1/161/420 pk180 3/321/420 pk190 1/8 sq20 pk1 40 1/B sl/420 pk195 1/8 s 1/220 oS315 3/16 sq20 pk215 1/4 sq20 pk315 1/41/220pk430 3/8Sq10pk225 3/9sl/210pk315 1/2 sq10 pSI360 48 STICKS 25 PINESTICKS 36 1/B sq10 pk125 1/8 s 1/410 pk1 55 1/83/B10 pk200 3/16 sq10 pk16S 1/4 sq10 Ek255 1/43/810 pk295 3/8 sq10 pk370 46 STICKS ADD 25/ BIRCH DOWELS 36 1/610 pk95 3/1610 pk109 1/410 pk1 40 POPLAB LTE PLY 49 1/56 2 pk300 1/8 12 2 pSI600 3PIy BIRCH PLSWOOG4B 1/32121 pSI425 1/16121 pS435 1/8 12 1 pSI450 5 PLY BIRCH48 3/32s121pk570 1/B 12 1pk565 3/16121pk585 1/4 sl 1pk600 FUN FLI4OSTAR STIKLONESTARCOMINGSOON STARBAT onbal S1495 KWIKSTAR $2495 Oa ck e 500 51 Spas 19 40 Esgoe51 Span 19 40 Esgne48 Spas 19- 35 EnReeSALE $1995$1995 1895Eon Canabal54200 Eon 25RCS4895Eon 1BBBRC5400 Kits feature foam wings balsa ply fuse Machine cut parts rugged very Fon 4OBBRC 5700 quick assembly outstanding value. Choice trike gear tail dragger.Eon 45 BBRC5200 Eon Eagle II7500 Riley Wootens UC Combat ShadowfoamcoresS895 accept Visa Master Charge personal checks COD pay Ups 1/2A foam cores $495 Handling charge -$300 add $200 COD 5% tax TX US CurrBncy certainly concur drag business black smithing such spinner alternative would require bit hand drill fear theres will. Nats unofficial FF events Terry Rimert NFFS official Unofficial Events Director sent official Unofficial Events list youll find convenient box elsewhere column Some appropriate might apply either both Indoor Outdoor depending official Indoor events handled should come pass events creeps official Nats events list itll scrubbed Unofficial Events listgot addition expect therell bunch FF Scale events held unofficial basis too want straight scoop plus Rubber Power Speed model plans rules schedule Beat Matsuno iron-on T-shirt write Terry Rimert 367 Orange Ave Baldwin FL 32234 thats official Another rubber winder finally managed borrow new Gaylord 6-to-I winders purchased Sig friend evaluation Borrowing things friendB evaluation sure-fire way collect lot ex-friends anyhow rst off really 6-to-i winder Upon counting output turns vs input turns reckoned seemed bit shy So after short almost bloodless struggle ex-friend knife-bladed case apart counted teeth can remember losing lot potential girlfriends way Two gear-pairs series no surprise 24-teeth-to-lO-teeth Dig out calculator punch 24/lOx 24/10 push omofl button try again get 6 Nope get 576 submit 576 6 Oh well 4% short isnt much nowadays Besides modelers just go turns-on-the-winder judge whether theyre winding fullythe actual turns-in-the-motor rather academic having already forced crawl inside little beastie decided walk around bit have look spied gob grease two faces gears teeth grease might some good shafts thrust washers seemed have lubed bit couldnt resist slopping little Lubriplate gear teeth noted possibly bit whittling could sneak Sig ball-bearing thrust bearing between output gear housing Such modification might put World Class whether could doneand would worth fuss bother gamble bottom line however well works turns Out according distinguished panel ofjudges just fine wound repeat edly breaking point loop 3/16-in rubber seemed smooth way Such motor produces about much torque would feel comfortable using such small handful winder anyhow advertis ing gives few clues its intended use seems smallish sport models Peanut Scale such would better suited overall ratio closer 10 15 rather 6 6 whale leg up 4 PS Gaylord winder available hobby shops mail-order outfits catering Free Flighters Check directory appeared May June 1981 issues Tri-winglets revisited Immediately upon sub mitting good three better item regarding winglets May issue shot letter off Chief Technical Consultant NASAs W Hewitt Phillips inquiring about potential such stuff FF models reply reads part received letter inquiring about tip feathers Wing tip vanes similar ones show tested Cranfield England after left have seen magazine articles technical report apparently quite effective increasing effective aspect ratio though course increased actual aspect ratio too some extent As tested Moraine- Saulnier Paris jet trainer used stu dent instruction Cranfield vanes radiated tip tank TZiqhr l3ox edm 7odesa $9900 / VISA DELIVERED Four Folding Legs Wing & Fuselage Holders Add $400 Shipping Calif 6% Tax RAC Products408 274-1 915 3200 Knightswood Way 6 San Jose CA 95148 NEW FUEL fuel Blue Flame gives youedge performance BLUE FLAME fuels made highest quality ingredients give engine Best Performance Longest Life Made blend synthetic castor beet possible lubrication Oet6rgsnt action cut varnish muffler 4 Gallon Case MIX OR MATCH PER GALLONDrum 5%$535 Write 10%$605 call 15%$670 st 25%$850drum orices No COD FOB Englewood Check Chargecard Money Order Only Send FREE Catalog Shipping Cost Per Case UPS Call UPS zone 2672 WEST HAMPDEN / ENGLEWOOD CO 80110 PHONE 303 789-9411 July 1982 159 2- 426 3- 513 4- 630 5 759 6- 946 7-1148 8- 1376 Original Developer- BY GIBBS HOBBY & RESEAKUl-I The Factory Trained Authorized Master Service Dealer r7 Year LmIted Pre-Dnlled Props Avail Ask About Custom- Built KIORITZ Engines Deep Fins Optimum Cooling 21/4 Flywheel Small Magneto 1 5/8 Six Bolt Aluminum Hub 242 cc C 397cc 32HP 8000 tprn Weight 6 lb Carb Needles &Throttle Accessible Engine Running [T1 IDon Godfrey 1722I76J Points Sealed Rear Housing $19995 pay shIp pre-paid orders Mufflers Now Available DEALERS WELCOME sell Reornge cc Crack Caged Rollers Rod acd Protoc Pin GIBBS HOBBY & RESEARCH 6195 Hillfield St NW N CANTON OHIO 44720 Phone 216 499-8854 after 600 PM dont have much hope tip-feathers would benefit models because low Rey nolds numbers vanes possibly large interference drag between wouldnt want discourage anyone trying turns out smidgin information about tip-feathers appeared terminal alas issue AeromodellerAnnuai 1978-79 E F Bucks article Bird Aerodynamics Ill check further anything good ever comes Novice Pennyplane prop built incorporating prop tiplets built shortly after Whitcombs reports first appeared can guarantee Ill very first let know about Round wing-tippers arise February column mentioned Erv Rodemskys proposal changing rules FAI World Champion ships Indoor competition proposal created predictable fuss has backed down bit thats beside point Id like address discussions following ideas seem agreed upon less 1 Maximum span-and-chord rules lot easier administer maximum area rules 2 maximum span-and-chord rules invoked everybody will build models rectangular wings certainly agree No I agree No 2 least short run will prevail experience Easy B demonstrates last time saw Easy B square nearly-square tips submit maximum span-andchord rules square tips dead wrong So come winning Easy B models have square-ish tips Easy Everybody agrees mini mum-weight maximum chord-and-span rules need area can get expert fliers believe So expert fliers build square-tip models win win because expert fliers despite crummy wing tips rummy isnt going beat expert flier has efficient wing tips Everyone notices Mr Expert Flier wins lot Mr Expert F uses square wing tips everybody copies No asks Mr EF mightnt better crummy square tips Mr EF rock own boat elliptical-planform wings have ellip tical lift distribution rectangular-planform wings have rectangular lift distribution pigs eye have lift distribution far elliptical rectangular extra 22% area get going elliptical rectangular planform creates per haps 5% lift say little bit helps True lift good drag baa extra 22% wing area still contributes its full share skin-friction drag low Reynolds numbers Indoor wings work skin friction mainly large So given constraints maximum spanand-chord rule what optimum shape Id guess something about halfway between elliptical rectangular chord distribution would awfully close Frank Zaic figured out help about 1933 con soling thing about optimums can miss quite lot still hurt much agree tenth what have said have also agree within constraints maximum span-and-chord rule square miles area remaining experimentation What have said about lift distribution applies flat wing no twist So what about twist whole lot itself Id guess What about dihedral None . unlikely bit tribute single break center just prop up last few inches what Winglets iginally defined see column August 1977 issue likely such low Reynolds numbers about short tips steep dihedral smidgin washout perhaps toeing-out dihedral-break rib es tip bit winglet since must have bit dihedral anyhow make pay its way little notions about what right might totally wrong Im dead sure square tips bit less right feel sure long run given head once square-tip syn drome has exorcised modelers would veer away square tips although might always succeed would always have hell lot fun trying has ever editorial often read articles author says did think really tees otV2 comes oft sort share-the-blame gambit IfI say some thing wrongorsomethingwith disagree dont blame blame us Id like make clear Iwrite column nowe involved although occasionally slip syndrome myself could logically imagined casual reader what might say column represents corporate opinion AMA Sunlight thro Poetry sMGO Par 049 46 Wingspan superb genlir old Megow kit e Dealers ribu 703 573-u 160 Model Aviation SPECIFICATIONS WaIbro Pcctp Cath 3 Ricg Pistoc HOT STUFFM VIDEO-TIPS FREE FOR UP TO 60 DAYS ONE HOUR VHS CASSETTE CLUB MEETINGS HOBBY SHOPS DISTRIBUTORS ORGANIZATIONS $3000 refundable deposit requIred order Send name address phone check Satellite City PO Box 836 Simi CA 93062 -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW
Edition: Model Aviation - 1982/07
Page Numbers: 66, 67, 158, 159, 160, 161
Free Flight DURA TION Bob Meuser THE MONTREAL STOP Its funny go 10 years anyone mentioning particular subject get three letters same mail asking about So has Montreal stop version Montreal stop shown drawing developed Roger Gregory Wakefield Rubber model Roger has similar much lighter versionit uses bent sheetaluminum hub rather milled-out bar stock Helicopt wtogyn nitho nched Rubber nce ne er Speed Rubber -power Di Vlaxer Rubber Mulvihill models blade attachment Roger has using years has proven reliable Roger says whole shebang can made electric drill hand tools us might have bit difficulty doing way basic Montreal stop features Rogers however can readily adapted bar-stock hub sold NFFS Supplies Montreal stop features Gregorys version stick pretty closely original ones appeared early Sixties dont know name comes Ive heard said really invented Los Angeles According Free Flight News England device subject patent filed USSR 1978 Darn weve scooped again Most readers must familiar classic tension stop used Rubber models since early Thirties pin sticking out back nose plug engages arm extending prop shaft prop shaft free slide fore aft through prop hub spring-loaded forward against tension rubber motor ec/v GT Aua 9 5ocAE7$ -IA TCA O/LL5 W/ ri-i F/A-7z/dee BLAL &dEC/-/ D6kVLL 4/ALL 4L TUBING SLIT TZI&/NG 6s/o6 7e2 Gg/ 72 WOV - 5QLOQ aEA5s S IL VEjEPcA5IN cve EeW/EE 7 Y9 AL SA &/ANee SEA 5 WA 5AE' e eV05 A-tA C19/N~C AL CLAA-1 kI-$7W CA 5GdE 77/S CAAJ ALL &e DcNe 14//7Y-/ LeTC7 L2eILL # C67ZeYT57-y~ 5Ae/NG As C/L S Heres Montreal atop Wakefield Bob describes works column thought Rubber models simple 66 Model Aviation Four-Vear-Ola Idarnan Larrer meets mild success VTOing Square OneNo 1 Jack Carters Seven Steps Microfilm series Dick Smith powers Country Boy Fox Combat Special helped Boys designer Jim Clem develop model Larry Kruse photo 5pinncr Startcr modified device once tension rubber motor drops below certain point prop shaft brought dead stop preventing motor going completely slack flopping around allowing prop freewheel fold according its nature essential feature Montreal stop point prop shaft becomes locked depends torque rubber motor rather its tension Further once prop has stopped stays way tension-stop designs isnt true Another feature found true Montreal stop devices locking pin prevents prop rotating after motor wound until f Stnner flier decides time launch operating sequence goes like After motor has wound stop pin right side Rogers drawing pulled out force produced end L-shaped part prop shaft motor torque combined friction holds pin out until motor torque slacks off point spring pushes pin Continued page 158 Hemember tne photo ot urocoolle moryo nourance mooei teatured April issue nose art intrigued Doug Dahike thought hed try little own neatly-executed Sweepette HIG July 198267 John Blair prepares launch oupe de yule Huboer moocH ns Blue Ridge kit Photo Paul Clark Charles McCutcheons method aligns electric starter engine smooth operation Ate-rnativ& BUILT UP AND READY-TO-FLY Higgins Contempo CAP 20L 81 Span & Christen Eagle II 69 Span Write Call Construction Methods Technical Information D R HIGGINS & ASSOCIATES 25403 Via Impresso Valencia CA 91355 Phone 805 254-3017 * Aerocommander SHRIKE 15 ft wingspan Ohio Superstar * *3rd Annual * Hall Fame Giant Plane Fly-In y 17 8- 18 Canton R/C Club field- * The Best GIANT uncontests area * *For Details contact *Bob CampbellSteak fry Saturday night *706 Easton NCanton OH 44720Camping Motels *216-499-5323Refreshments field r " K P P PFFP block right No downthrust needed has built design Gradually build up turns until reach 350 400 maximum safe limit turns can increased rubber stretched helper holding firmly nose hand loosely around rubber can catch it should break burst motor can lot damage covering model should climb too steeply after gentle start hand shim up front tail sliver balsa paper adding necessary Should descend steeply shim up trailing edge tail expect flights longer 30 40 seconds that has designed will riseoff-ground smooth patch quite nicely fun see tail come up gentle climb very docile Much help given late Glen Sigafoose sent propellers rubber power U 0 ow U U1/20 TH SCALE XCUMENTAK OF NOTABLE FAIRCHILDS TA2VDWGS GEORGE H CLAPP CENTRAL SOUAIIE NY /3036I INFO 2100 -REFUNDED WITH ORDERS hundred Marissas Bob Peck Peck-Polymers Frank Zaic also contributed project FF Duration/Meuser Continued jaqe 67 rearward allowing engage hole nose block beginning sound about exciting patent application Also after winding locking pin left side Rogers drawing pushed hole nose block prop allowed rotate torque until pin locks release locking pin flier rotates prop against torque allowing spring push pin out spring wire tubing sizes have carefully worked out can probably adap ted hub choice Rogers entire design bit beyond shop facilities Note forward hole locking pin 3/32 diameter rearward 1/16 stop pin hole sizes reversed Easy-does-it engine starter received fol lowing note Charles McCutcheon Back working Glowdriver introduction electric starters amazed people would use anything brutal deli cate models starter well-aligned engine operation smooth alignment bad starter thrashes around tries tear engine out airplane fitted starter -in diameter aligning pin drilled -in hole end spinner see sketch alignment took care itself opera tion always very smooth spinner shaped thus alternative spinner sketch aligning pin would easily find hole doubt would increase drag much product review product review product review two interesting new models glider fans among us Soarer Two-Meter design offers some inter esting aerodynamics all-wood kit featuring bolt-on wing tail simple efficient spoilers Fuse sides onepiece light plyforduability Soarer can flown two three channels flown two three channels deluxe kit complete vac-formed clear canopy tow hook rudder elevator pushrods spoiler actuators Retail price $4495 less ambitious want get out fly Mid wests latest all-foam critter called Lazy Bird first-time builder will like easy assembly bolt-on wing reinforced top-and-bottom spars spacious fuse plywood spine built-in towhook skid experienced pilotwill appre ciate flight characteristics its said fly just well wooden model Thorough step-by-step instructions included Lazy Bird will have merit beginners kit since Sailplanes aregener ally easier fly powered planes especially dont have expert help Lazy Bird requires two-channel radio retails $5995 product review product review product review 1 58 Model Aviation IROWN A23 0-2w ~TINY PEANUT CO-2 ENGINEHE ENGINECHARGER COMPLETE CATALOG $100 PHONE 714 469-8875 o 442 4836 Peck-P Iyfues W BOX 249R -MA LA MESA CALIF 92041 Soarer Lazy Bird Sailplanes Midwest Products Co 400 5 Indiana St Hobart IN 46432 BALSA SHEETS 36 1/16210pk290 3/32210p5358 1/8s210p5385 3/16n210pk435 1/4210pk499 1/16310pSI330 3/32 3 10 pk390 1/8 310 pk480 3/1635pSI275 1/4 n3 5 pS325 5/16 3 5 pSI380 3/8 3 5 pk395 1/2 3 5 pk495 3/4n3 29k280 1 n32 SkI350 1/16 n4 10 pk520 3/32 4 5 pk315 1/8 n45pk360 3/16 n45pk415 1/4 45pSi495 LIGHT 4 6 LB 36 1/163lOpk430 3/32310 pS490 1/9310 pk560 3/16x 35 pk325 1/435 p5375 3/835 pk495 1/235 pk599 MATCHED SHEETS 42 3/32 4 4 pk399 1/944pk429 3/16 44pk459 1/4 44pk499 BALSA SHEETS 48 1/16310 pk440 3/32310 pk515 1/83 10 pSI 635 3/1635 pSI369 1/435 pk425 3/835 951556 1/234 pSI560 1164lOpS660 3/32s45pk419 l/8s45pk475 3/16 45pk547 1/4s45pk600 TRAILING EDGE 36 1416pk200 5/161-1/48pk250 3/81-1/216pk299 1/2 2 4 pk299 BALSA SHEETS 30~ 1/16310pk275 3/32310Ek325 1/83 10 Ek405 1/16n4lOpk200 3/32410pk504 BALSA TRIANGLES 36 1/41/4109k250 3/63/B10pk320 1/21/210pk430 3/4 3/45 ELI209 11Spk275 1/8410 pk590 BALSASTICKS 39~ 1/161/420 pk180 3/321/420 pk190 1/8 sq20 pk1 40 1/B sl/420 pk195 1/8 s 1/220 oS315 3/16 sq20 pk215 1/4 sq20 pk315 1/41/220pk430 3/8Sq10pk225 3/9sl/210pk315 1/2 sq10 pSI360 48 STICKS 25 PINESTICKS 36 1/B sq10 pk125 1/8 s 1/410 pk1 55 1/83/B10 pk200 3/16 sq10 pk16S 1/4 sq10 Ek255 1/43/810 pk295 3/8 sq10 pk370 46 STICKS ADD 25/ BIRCH DOWELS 36 1/610 pk95 3/1610 pk109 1/410 pk1 40 POPLAB LTE PLY 49 1/56 2 pk300 1/8 12 2 pSI600 3PIy BIRCH PLSWOOG4B 1/32121 pSI425 1/16121 pS435 1/8 12 1 pSI450 5 PLY BIRCH48 3/32s121pk570 1/B 12 1pk565 3/16121pk585 1/4 sl 1pk600 FUN FLI4OSTAR STIKLONESTARCOMINGSOON STARBAT onbal S1495 KWIKSTAR $2495 Oa ck e 500 51 Spas 19 40 Esgoe51 Span 19 40 Esgne48 Spas 19- 35 EnReeSALE $1995$1995 1895Eon Canabal54200 Eon 25RCS4895Eon 1BBBRC5400 Kits feature foam wings balsa ply fuse Machine cut parts rugged very Fon 4OBBRC 5700 quick assembly outstanding value. Choice trike gear tail dragger.Eon 45 BBRC5200 Eon Eagle II7500 Riley Wootens UC Combat ShadowfoamcoresS895 accept Visa Master Charge personal checks COD pay Ups 1/2A foam cores $495 Handling charge -$300 add $200 COD 5% tax TX US CurrBncy certainly concur drag business black smithing such spinner alternative would require bit hand drill fear theres will. Nats unofficial FF events Terry Rimert NFFS official Unofficial Events Director sent official Unofficial Events list youll find convenient box elsewhere column Some appropriate might apply either both Indoor Outdoor depending official Indoor events handled should come pass events creeps official Nats events list itll scrubbed Unofficial Events listgot addition expect therell bunch FF Scale events held unofficial basis too want straight scoop plus Rubber Power Speed model plans rules schedule Beat Matsuno iron-on T-shirt write Terry Rimert 367 Orange Ave Baldwin FL 32234 thats official Another rubber winder finally managed borrow new Gaylord 6-to-I winders purchased Sig friend evaluation Borrowing things friendB evaluation sure-fire way collect lot ex-friends anyhow rst off really 6-to-i winder Upon counting output turns vs input turns reckoned seemed bit shy So after short almost bloodless struggle ex-friend knife-bladed case apart counted teeth can remember losing lot potential girlfriends way Two gear-pairs series no surprise 24-teeth-to-lO-teeth Dig out calculator punch 24/lOx 24/10 push omofl button try again get 6 Nope get 576 submit 576 6 Oh well 4% short isnt much nowadays Besides modelers just go turns-on-the-winder judge whether theyre winding fullythe actual turns-in-the-motor rather academic having already forced crawl inside little beastie decided walk around bit have look spied gob grease two faces gears teeth grease might some good shafts thrust washers seemed have lubed bit couldnt resist slopping little Lubriplate gear teeth noted possibly bit whittling could sneak Sig ball-bearing thrust bearing between output gear housing Such modification might put World Class whether could doneand would worth fuss bother gamble bottom line however well works turns Out according distinguished panel ofjudges just fine wound repeat edly breaking point loop 3/16-in rubber seemed smooth way Such motor produces about much torque would feel comfortable using such small handful winder anyhow advertis ing gives few clues its intended use seems smallish sport models Peanut Scale such would better suited overall ratio closer 10 15 rather 6 6 whale leg up 4 PS Gaylord winder available hobby shops mail-order outfits catering Free Flighters Check directory appeared May June 1981 issues Tri-winglets revisited Immediately upon sub mitting good three better item regarding winglets May issue shot letter off Chief Technical Consultant NASAs W Hewitt Phillips inquiring about potential such stuff FF models reply reads part received letter inquiring about tip feathers Wing tip vanes similar ones show tested Cranfield England after left have seen magazine articles technical report apparently quite effective increasing effective aspect ratio though course increased actual aspect ratio too some extent As tested Moraine- Saulnier Paris jet trainer used stu dent instruction Cranfield vanes radiated tip tank TZiqhr l3ox edm 7odesa $9900 / VISA DELIVERED Four Folding Legs Wing & Fuselage Holders Add $400 Shipping Calif 6% Tax RAC Products408 274-1 915 3200 Knightswood Way 6 San Jose CA 95148 NEW FUEL fuel Blue Flame gives youedge performance BLUE FLAME fuels made highest quality ingredients give engine Best Performance Longest Life Made blend synthetic castor beet possible lubrication Oet6rgsnt action cut varnish muffler 4 Gallon Case MIX OR MATCH PER GALLONDrum 5%$535 Write 10%$605 call 15%$670 st 25%$850drum orices No COD FOB Englewood Check Chargecard Money Order Only Send FREE Catalog Shipping Cost Per Case UPS Call UPS zone 2672 WEST HAMPDEN / ENGLEWOOD CO 80110 PHONE 303 789-9411 July 1982 159 2- 426 3- 513 4- 630 5 759 6- 946 7-1148 8- 1376 Original Developer- BY GIBBS HOBBY & RESEAKUl-I The Factory Trained Authorized Master Service Dealer r7 Year LmIted Pre-Dnlled Props Avail Ask About Custom- Built KIORITZ Engines Deep Fins Optimum Cooling 21/4 Flywheel Small Magneto 1 5/8 Six Bolt Aluminum Hub 242 cc C 397cc 32HP 8000 tprn Weight 6 lb Carb Needles &Throttle Accessible Engine Running [T1 IDon Godfrey 1722I76J Points Sealed Rear Housing $19995 pay shIp pre-paid orders Mufflers Now Available DEALERS WELCOME sell Reornge cc Crack Caged Rollers Rod acd Protoc Pin GIBBS HOBBY & RESEARCH 6195 Hillfield St NW N CANTON OHIO 44720 Phone 216 499-8854 after 600 PM dont have much hope tip-feathers would benefit models because low Rey nolds numbers vanes possibly large interference drag between wouldnt want discourage anyone trying turns out smidgin information about tip-feathers appeared terminal alas issue AeromodellerAnnuai 1978-79 E F Bucks article Bird Aerodynamics Ill check further anything good ever comes Novice Pennyplane prop built incorporating prop tiplets built shortly after Whitcombs reports first appeared can guarantee Ill very first let know about Round wing-tippers arise February column mentioned Erv Rodemskys proposal changing rules FAI World Champion ships Indoor competition proposal created predictable fuss has backed down bit thats beside point Id like address discussions following ideas seem agreed upon less 1 Maximum span-and-chord rules lot easier administer maximum area rules 2 maximum span-and-chord rules invoked everybody will build models rectangular wings certainly agree No I agree No 2 least short run will prevail experience Easy B demonstrates last time saw Easy B square nearly-square tips submit maximum span-andchord rules square tips dead wrong So come winning Easy B models have square-ish tips Easy Everybody agrees mini mum-weight maximum chord-and-span rules need area can get expert fliers believe So expert fliers build square-tip models win win because expert fliers despite crummy wing tips rummy isnt going beat expert flier has efficient wing tips Everyone notices Mr Expert Flier wins lot Mr Expert F uses square wing tips everybody copies No asks Mr EF mightnt better crummy square tips Mr EF rock own boat elliptical-planform wings have ellip tical lift distribution rectangular-planform wings have rectangular lift distribution pigs eye have lift distribution far elliptical rectangular extra 22% area get going elliptical rectangular planform creates per haps 5% lift say little bit helps True lift good drag baa extra 22% wing area still contributes its full share skin-friction drag low Reynolds numbers Indoor wings work skin friction mainly large So given constraints maximum spanand-chord rule what optimum shape Id guess something about halfway between elliptical rectangular chord distribution would awfully close Frank Zaic figured out help about 1933 con soling thing about optimums can miss quite lot still hurt much agree tenth what have said have also agree within constraints maximum span-and-chord rule square miles area remaining experimentation What have said about lift distribution applies flat wing no twist So what about twist whole lot itself Id guess What about dihedral None . unlikely bit tribute single break center just prop up last few inches what Winglets iginally defined see column August 1977 issue likely such low Reynolds numbers about short tips steep dihedral smidgin washout perhaps toeing-out dihedral-break rib es tip bit winglet since must have bit dihedral anyhow make pay its way little notions about what right might totally wrong Im dead sure square tips bit less right feel sure long run given head once square-tip syn drome has exorcised modelers would veer away square tips although might always succeed would always have hell lot fun trying has ever editorial often read articles author says did think really tees otV2 comes oft sort share-the-blame gambit IfI say some thing wrongorsomethingwith disagree dont blame blame us Id like make clear Iwrite column nowe involved although occasionally slip syndrome myself could logically imagined casual reader what might say column represents corporate opinion AMA Sunlight thro Poetry sMGO Par 049 46 Wingspan superb genlir old Megow kit e Dealers ribu 703 573-u 160 Model Aviation SPECIFICATIONS WaIbro Pcctp Cath 3 Ricg Pistoc HOT STUFFM VIDEO-TIPS FREE FOR UP TO 60 DAYS ONE HOUR VHS CASSETTE CLUB MEETINGS HOBBY SHOPS DISTRIBUTORS ORGANIZATIONS $3000 refundable deposit requIred order Send name address phone check Satellite City PO Box 836 Simi CA 93062 -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW
Edition: Model Aviation - 1982/07
Page Numbers: 66, 67, 158, 159, 160, 161
Free Flight DURA TION Bob Meuser THE MONTREAL STOP Its funny go 10 years anyone mentioning particular subject get three letters same mail asking about So has Montreal stop version Montreal stop shown drawing developed Roger Gregory Wakefield Rubber model Roger has similar much lighter versionit uses bent sheetaluminum hub rather milled-out bar stock Helicopt wtogyn nitho nched Rubber nce ne er Speed Rubber -power Di Vlaxer Rubber Mulvihill models blade attachment Roger has using years has proven reliable Roger says whole shebang can made electric drill hand tools us might have bit difficulty doing way basic Montreal stop features Rogers however can readily adapted bar-stock hub sold NFFS Supplies Montreal stop features Gregorys version stick pretty closely original ones appeared early Sixties dont know name comes Ive heard said really invented Los Angeles According Free Flight News England device subject patent filed USSR 1978 Darn weve scooped again Most readers must familiar classic tension stop used Rubber models since early Thirties pin sticking out back nose plug engages arm extending prop shaft prop shaft free slide fore aft through prop hub spring-loaded forward against tension rubber motor ec/v GT Aua 9 5ocAE7$ -IA TCA O/LL5 W/ ri-i F/A-7z/dee BLAL &dEC/-/ D6kVLL 4/ALL 4L TUBING SLIT TZI&/NG 6s/o6 7e2 Gg/ 72 WOV - 5QLOQ aEA5s S IL VEjEPcA5IN cve EeW/EE 7 Y9 AL SA &/ANee SEA 5 WA 5AE' e eV05 A-tA C19/N~C AL CLAA-1 kI-$7W CA 5GdE 77/S CAAJ ALL &e DcNe 14//7Y-/ LeTC7 L2eILL # C67ZeYT57-y~ 5Ae/NG As C/L S Heres Montreal atop Wakefield Bob describes works column thought Rubber models simple 66 Model Aviation Four-Vear-Ola Idarnan Larrer meets mild success VTOing Square OneNo 1 Jack Carters Seven Steps Microfilm series Dick Smith powers Country Boy Fox Combat Special helped Boys designer Jim Clem develop model Larry Kruse photo 5pinncr Startcr modified device once tension rubber motor drops below certain point prop shaft brought dead stop preventing motor going completely slack flopping around allowing prop freewheel fold according its nature essential feature Montreal stop point prop shaft becomes locked depends torque rubber motor rather its tension Further once prop has stopped stays way tension-stop designs isnt true Another feature found true Montreal stop devices locking pin prevents prop rotating after motor wound until f Stnner flier decides time launch operating sequence goes like After motor has wound stop pin right side Rogers drawing pulled out force produced end L-shaped part prop shaft motor torque combined friction holds pin out until motor torque slacks off point spring pushes pin Continued page 158 Hemember tne photo ot urocoolle moryo nourance mooei teatured April issue nose art intrigued Doug Dahike thought hed try little own neatly-executed Sweepette HIG July 198267 John Blair prepares launch oupe de yule Huboer moocH ns Blue Ridge kit Photo Paul Clark Charles McCutcheons method aligns electric starter engine smooth operation Ate-rnativ& BUILT UP AND READY-TO-FLY Higgins Contempo CAP 20L 81 Span & Christen Eagle II 69 Span Write Call Construction Methods Technical Information D R HIGGINS & ASSOCIATES 25403 Via Impresso Valencia CA 91355 Phone 805 254-3017 * Aerocommander SHRIKE 15 ft wingspan Ohio Superstar * *3rd Annual * Hall Fame Giant Plane Fly-In y 17 8- 18 Canton R/C Club field- * The Best GIANT uncontests area * *For Details contact *Bob CampbellSteak fry Saturday night *706 Easton NCanton OH 44720Camping Motels *216-499-5323Refreshments field r " K P P PFFP block right No downthrust needed has built design Gradually build up turns until reach 350 400 maximum safe limit turns can increased rubber stretched helper holding firmly nose hand loosely around rubber can catch it should break burst motor can lot damage covering model should climb too steeply after gentle start hand shim up front tail sliver balsa paper adding necessary Should descend steeply shim up trailing edge tail expect flights longer 30 40 seconds that has designed will riseoff-ground smooth patch quite nicely fun see tail come up gentle climb very docile Much help given late Glen Sigafoose sent propellers rubber power U 0 ow U U1/20 TH SCALE XCUMENTAK OF NOTABLE FAIRCHILDS TA2VDWGS GEORGE H CLAPP CENTRAL SOUAIIE NY /3036I INFO 2100 -REFUNDED WITH ORDERS hundred Marissas Bob Peck Peck-Polymers Frank Zaic also contributed project FF Duration/Meuser Continued jaqe 67 rearward allowing engage hole nose block beginning sound about exciting patent application Also after winding locking pin left side Rogers drawing pushed hole nose block prop allowed rotate torque until pin locks release locking pin flier rotates prop against torque allowing spring push pin out spring wire tubing sizes have carefully worked out can probably adap ted hub choice Rogers entire design bit beyond shop facilities Note forward hole locking pin 3/32 diameter rearward 1/16 stop pin hole sizes reversed Easy-does-it engine starter received fol lowing note Charles McCutcheon Back working Glowdriver introduction electric starters amazed people would use anything brutal deli cate models starter well-aligned engine operation smooth alignment bad starter thrashes around tries tear engine out airplane fitted starter -in diameter aligning pin drilled -in hole end spinner see sketch alignment took care itself opera tion always very smooth spinner shaped thus alternative spinner sketch aligning pin would easily find hole doubt would increase drag much product review product review product review two interesting new models glider fans among us Soarer Two-Meter design offers some inter esting aerodynamics all-wood kit featuring bolt-on wing tail simple efficient spoilers Fuse sides onepiece light plyforduability Soarer can flown two three channels flown two three channels deluxe kit complete vac-formed clear canopy tow hook rudder elevator pushrods spoiler actuators Retail price $4495 less ambitious want get out fly Mid wests latest all-foam critter called Lazy Bird first-time builder will like easy assembly bolt-on wing reinforced top-and-bottom spars spacious fuse plywood spine built-in towhook skid experienced pilotwill appre ciate flight characteristics its said fly just well wooden model Thorough step-by-step instructions included Lazy Bird will have merit beginners kit since Sailplanes aregener ally easier fly powered planes especially dont have expert help Lazy Bird requires two-channel radio retails $5995 product review product review product review 1 58 Model Aviation IROWN A23 0-2w ~TINY PEANUT CO-2 ENGINEHE ENGINECHARGER COMPLETE CATALOG $100 PHONE 714 469-8875 o 442 4836 Peck-P Iyfues W BOX 249R -MA LA MESA CALIF 92041 Soarer Lazy Bird Sailplanes Midwest Products Co 400 5 Indiana St Hobart IN 46432 BALSA SHEETS 36 1/16210pk290 3/32210p5358 1/8s210p5385 3/16n210pk435 1/4210pk499 1/16310pSI330 3/32 3 10 pk390 1/8 310 pk480 3/1635pSI275 1/4 n3 5 pS325 5/16 3 5 pSI380 3/8 3 5 pk395 1/2 3 5 pk495 3/4n3 29k280 1 n32 SkI350 1/16 n4 10 pk520 3/32 4 5 pk315 1/8 n45pk360 3/16 n45pk415 1/4 45pSi495 LIGHT 4 6 LB 36 1/163lOpk430 3/32310 pS490 1/9310 pk560 3/16x 35 pk325 1/435 p5375 3/835 pk495 1/235 pk599 MATCHED SHEETS 42 3/32 4 4 pk399 1/944pk429 3/16 44pk459 1/4 44pk499 BALSA SHEETS 48 1/16310 pk440 3/32310 pk515 1/83 10 pSI 635 3/1635 pSI369 1/435 pk425 3/835 951556 1/234 pSI560 1164lOpS660 3/32s45pk419 l/8s45pk475 3/16 45pk547 1/4s45pk600 TRAILING EDGE 36 1416pk200 5/161-1/48pk250 3/81-1/216pk299 1/2 2 4 pk299 BALSA SHEETS 30~ 1/16310pk275 3/32310Ek325 1/83 10 Ek405 1/16n4lOpk200 3/32410pk504 BALSA TRIANGLES 36 1/41/4109k250 3/63/B10pk320 1/21/210pk430 3/4 3/45 ELI209 11Spk275 1/8410 pk590 BALSASTICKS 39~ 1/161/420 pk180 3/321/420 pk190 1/8 sq20 pk1 40 1/B sl/420 pk195 1/8 s 1/220 oS315 3/16 sq20 pk215 1/4 sq20 pk315 1/41/220pk430 3/8Sq10pk225 3/9sl/210pk315 1/2 sq10 pSI360 48 STICKS 25 PINESTICKS 36 1/B sq10 pk125 1/8 s 1/410 pk1 55 1/83/B10 pk200 3/16 sq10 pk16S 1/4 sq10 Ek255 1/43/810 pk295 3/8 sq10 pk370 46 STICKS ADD 25/ BIRCH DOWELS 36 1/610 pk95 3/1610 pk109 1/410 pk1 40 POPLAB LTE PLY 49 1/56 2 pk300 1/8 12 2 pSI600 3PIy BIRCH PLSWOOG4B 1/32121 pSI425 1/16121 pS435 1/8 12 1 pSI450 5 PLY BIRCH48 3/32s121pk570 1/B 12 1pk565 3/16121pk585 1/4 sl 1pk600 FUN FLI4OSTAR STIKLONESTARCOMINGSOON STARBAT onbal S1495 KWIKSTAR $2495 Oa ck e 500 51 Spas 19 40 Esgoe51 Span 19 40 Esgne48 Spas 19- 35 EnReeSALE $1995$1995 1895Eon Canabal54200 Eon 25RCS4895Eon 1BBBRC5400 Kits feature foam wings balsa ply fuse Machine cut parts rugged very Fon 4OBBRC 5700 quick assembly outstanding value. Choice trike gear tail dragger.Eon 45 BBRC5200 Eon Eagle II7500 Riley Wootens UC Combat ShadowfoamcoresS895 accept Visa Master Charge personal checks COD pay Ups 1/2A foam cores $495 Handling charge -$300 add $200 COD 5% tax TX US CurrBncy certainly concur drag business black smithing such spinner alternative would require bit hand drill fear theres will. Nats unofficial FF events Terry Rimert NFFS official Unofficial Events Director sent official Unofficial Events list youll find convenient box elsewhere column Some appropriate might apply either both Indoor Outdoor depending official Indoor events handled should come pass events creeps official Nats events list itll scrubbed Unofficial Events listgot addition expect therell bunch FF Scale events held unofficial basis too want straight scoop plus Rubber Power Speed model plans rules schedule Beat Matsuno iron-on T-shirt write Terry Rimert 367 Orange Ave Baldwin FL 32234 thats official Another rubber winder finally managed borrow new Gaylord 6-to-I winders purchased Sig friend evaluation Borrowing things friendB evaluation sure-fire way collect lot ex-friends anyhow rst off really 6-to-i winder Upon counting output turns vs input turns reckoned seemed bit shy So after short almost bloodless struggle ex-friend knife-bladed case apart counted teeth can remember losing lot potential girlfriends way Two gear-pairs series no surprise 24-teeth-to-lO-teeth Dig out calculator punch 24/lOx 24/10 push omofl button try again get 6 Nope get 576 submit 576 6 Oh well 4% short isnt much nowadays Besides modelers just go turns-on-the-winder judge whether theyre winding fullythe actual turns-in-the-motor rather academic having already forced crawl inside little beastie decided walk around bit have look spied gob grease two faces gears teeth grease might some good shafts thrust washers seemed have lubed bit couldnt resist slopping little Lubriplate gear teeth noted possibly bit whittling could sneak Sig ball-bearing thrust bearing between output gear housing Such modification might put World Class whether could doneand would worth fuss bother gamble bottom line however well works turns Out according distinguished panel ofjudges just fine wound repeat edly breaking point loop 3/16-in rubber seemed smooth way Such motor produces about much torque would feel comfortable using such small handful winder anyhow advertis ing gives few clues its intended use seems smallish sport models Peanut Scale such would better suited overall ratio closer 10 15 rather 6 6 whale leg up 4 PS Gaylord winder available hobby shops mail-order outfits catering Free Flighters Check directory appeared May June 1981 issues Tri-winglets revisited Immediately upon sub mitting good three better item regarding winglets May issue shot letter off Chief Technical Consultant NASAs W Hewitt Phillips inquiring about potential such stuff FF models reply reads part received letter inquiring about tip feathers Wing tip vanes similar ones show tested Cranfield England after left have seen magazine articles technical report apparently quite effective increasing effective aspect ratio though course increased actual aspect ratio too some extent As tested Moraine- Saulnier Paris jet trainer used stu dent instruction Cranfield vanes radiated tip tank TZiqhr l3ox edm 7odesa $9900 / VISA DELIVERED Four Folding Legs Wing & Fuselage Holders Add $400 Shipping Calif 6% Tax RAC Products408 274-1 915 3200 Knightswood Way 6 San Jose CA 95148 NEW FUEL fuel Blue Flame gives youedge performance BLUE FLAME fuels made highest quality ingredients give engine Best Performance Longest Life Made blend synthetic castor beet possible lubrication Oet6rgsnt action cut varnish muffler 4 Gallon Case MIX OR MATCH PER GALLONDrum 5%$535 Write 10%$605 call 15%$670 st 25%$850drum orices No COD FOB Englewood Check Chargecard Money Order Only Send FREE Catalog Shipping Cost Per Case UPS Call UPS zone 2672 WEST HAMPDEN / ENGLEWOOD CO 80110 PHONE 303 789-9411 July 1982 159 2- 426 3- 513 4- 630 5 759 6- 946 7-1148 8- 1376 Original Developer- BY GIBBS HOBBY & RESEAKUl-I The Factory Trained Authorized Master Service Dealer r7 Year LmIted Pre-Dnlled Props Avail Ask About Custom- Built KIORITZ Engines Deep Fins Optimum Cooling 21/4 Flywheel Small Magneto 1 5/8 Six Bolt Aluminum Hub 242 cc C 397cc 32HP 8000 tprn Weight 6 lb Carb Needles &Throttle Accessible Engine Running [T1 IDon Godfrey 1722I76J Points Sealed Rear Housing $19995 pay shIp pre-paid orders Mufflers Now Available DEALERS WELCOME sell Reornge cc Crack Caged Rollers Rod acd Protoc Pin GIBBS HOBBY & RESEARCH 6195 Hillfield St NW N CANTON OHIO 44720 Phone 216 499-8854 after 600 PM dont have much hope tip-feathers would benefit models because low Rey nolds numbers vanes possibly large interference drag between wouldnt want discourage anyone trying turns out smidgin information about tip-feathers appeared terminal alas issue AeromodellerAnnuai 1978-79 E F Bucks article Bird Aerodynamics Ill check further anything good ever comes Novice Pennyplane prop built incorporating prop tiplets built shortly after Whitcombs reports first appeared can guarantee Ill very first let know about Round wing-tippers arise February column mentioned Erv Rodemskys proposal changing rules FAI World Champion ships Indoor competition proposal created predictable fuss has backed down bit thats beside point Id like address discussions following ideas seem agreed upon less 1 Maximum span-and-chord rules lot easier administer maximum area rules 2 maximum span-and-chord rules invoked everybody will build models rectangular wings certainly agree No I agree No 2 least short run will prevail experience Easy B demonstrates last time saw Easy B square nearly-square tips submit maximum span-andchord rules square tips dead wrong So come winning Easy B models have square-ish tips Easy Everybody agrees mini mum-weight maximum chord-and-span rules need area can get expert fliers believe So expert fliers build square-tip models win win because expert fliers despite crummy wing tips rummy isnt going beat expert flier has efficient wing tips Everyone notices Mr Expert Flier wins lot Mr Expert F uses square wing tips everybody copies No asks Mr EF mightnt better crummy square tips Mr EF rock own boat elliptical-planform wings have ellip tical lift distribution rectangular-planform wings have rectangular lift distribution pigs eye have lift distribution far elliptical rectangular extra 22% area get going elliptical rectangular planform creates per haps 5% lift say little bit helps True lift good drag baa extra 22% wing area still contributes its full share skin-friction drag low Reynolds numbers Indoor wings work skin friction mainly large So given constraints maximum spanand-chord rule what optimum shape Id guess something about halfway between elliptical rectangular chord distribution would awfully close Frank Zaic figured out help about 1933 con soling thing about optimums can miss quite lot still hurt much agree tenth what have said have also agree within constraints maximum span-and-chord rule square miles area remaining experimentation What have said about lift distribution applies flat wing no twist So what about twist whole lot itself Id guess What about dihedral None . unlikely bit tribute single break center just prop up last few inches what Winglets iginally defined see column August 1977 issue likely such low Reynolds numbers about short tips steep dihedral smidgin washout perhaps toeing-out dihedral-break rib es tip bit winglet since must have bit dihedral anyhow make pay its way little notions about what right might totally wrong Im dead sure square tips bit less right feel sure long run given head once square-tip syn drome has exorcised modelers would veer away square tips although might always succeed would always have hell lot fun trying has ever editorial often read articles author says did think really tees otV2 comes oft sort share-the-blame gambit IfI say some thing wrongorsomethingwith disagree dont blame blame us Id like make clear Iwrite column nowe involved although occasionally slip syndrome myself could logically imagined casual reader what might say column represents corporate opinion AMA Sunlight thro Poetry sMGO Par 049 46 Wingspan superb genlir old Megow kit e Dealers ribu 703 573-u 160 Model Aviation SPECIFICATIONS WaIbro Pcctp Cath 3 Ricg Pistoc HOT STUFFM VIDEO-TIPS FREE FOR UP TO 60 DAYS ONE HOUR VHS CASSETTE CLUB MEETINGS HOBBY SHOPS DISTRIBUTORS ORGANIZATIONS $3000 refundable deposit requIred order Send name address phone check Satellite City PO Box 836 Simi CA 93062 -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW
Edition: Model Aviation - 1982/07
Page Numbers: 66, 67, 158, 159, 160, 161
Free Flight DURA TION Bob Meuser THE MONTREAL STOP Its funny go 10 years anyone mentioning particular subject get three letters same mail asking about So has Montreal stop version Montreal stop shown drawing developed Roger Gregory Wakefield Rubber model Roger has similar much lighter versionit uses bent sheetaluminum hub rather milled-out bar stock Helicopt wtogyn nitho nched Rubber nce ne er Speed Rubber -power Di Vlaxer Rubber Mulvihill models blade attachment Roger has using years has proven reliable Roger says whole shebang can made electric drill hand tools us might have bit difficulty doing way basic Montreal stop features Rogers however can readily adapted bar-stock hub sold NFFS Supplies Montreal stop features Gregorys version stick pretty closely original ones appeared early Sixties dont know name comes Ive heard said really invented Los Angeles According Free Flight News England device subject patent filed USSR 1978 Darn weve scooped again Most readers must familiar classic tension stop used Rubber models since early Thirties pin sticking out back nose plug engages arm extending prop shaft prop shaft free slide fore aft through prop hub spring-loaded forward against tension rubber motor ec/v GT Aua 9 5ocAE7$ -IA TCA O/LL5 W/ ri-i F/A-7z/dee BLAL &dEC/-/ D6kVLL 4/ALL 4L TUBING SLIT TZI&/NG 6s/o6 7e2 Gg/ 72 WOV - 5QLOQ aEA5s S IL VEjEPcA5IN cve EeW/EE 7 Y9 AL SA &/ANee SEA 5 WA 5AE' e eV05 A-tA C19/N~C AL CLAA-1 kI-$7W CA 5GdE 77/S CAAJ ALL &e DcNe 14//7Y-/ LeTC7 L2eILL # C67ZeYT57-y~ 5Ae/NG As C/L S Heres Montreal atop Wakefield Bob describes works column thought Rubber models simple 66 Model Aviation Four-Vear-Ola Idarnan Larrer meets mild success VTOing Square OneNo 1 Jack Carters Seven Steps Microfilm series Dick Smith powers Country Boy Fox Combat Special helped Boys designer Jim Clem develop model Larry Kruse photo 5pinncr Startcr modified device once tension rubber motor drops below certain point prop shaft brought dead stop preventing motor going completely slack flopping around allowing prop freewheel fold according its nature essential feature Montreal stop point prop shaft becomes locked depends torque rubber motor rather its tension Further once prop has stopped stays way tension-stop designs isnt true Another feature found true Montreal stop devices locking pin prevents prop rotating after motor wound until f Stnner flier decides time launch operating sequence goes like After motor has wound stop pin right side Rogers drawing pulled out force produced end L-shaped part prop shaft motor torque combined friction holds pin out until motor torque slacks off point spring pushes pin Continued page 158 Hemember tne photo ot urocoolle moryo nourance mooei teatured April issue nose art intrigued Doug Dahike thought hed try little own neatly-executed Sweepette HIG July 198267 John Blair prepares launch oupe de yule Huboer moocH ns Blue Ridge kit Photo Paul Clark Charles McCutcheons method aligns electric starter engine smooth operation Ate-rnativ& BUILT UP AND READY-TO-FLY Higgins Contempo CAP 20L 81 Span & Christen Eagle II 69 Span Write Call Construction Methods Technical Information D R HIGGINS & ASSOCIATES 25403 Via Impresso Valencia CA 91355 Phone 805 254-3017 * Aerocommander SHRIKE 15 ft wingspan Ohio Superstar * *3rd Annual * Hall Fame Giant Plane Fly-In y 17 8- 18 Canton R/C Club field- * The Best GIANT uncontests area * *For Details contact *Bob CampbellSteak fry Saturday night *706 Easton NCanton OH 44720Camping Motels *216-499-5323Refreshments field r " K P P PFFP block right No downthrust needed has built design Gradually build up turns until reach 350 400 maximum safe limit turns can increased rubber stretched helper holding firmly nose hand loosely around rubber can catch it should break burst motor can lot damage covering model should climb too steeply after gentle start hand shim up front tail sliver balsa paper adding necessary Should descend steeply shim up trailing edge tail expect flights longer 30 40 seconds that has designed will riseoff-ground smooth patch quite nicely fun see tail come up gentle climb very docile Much help given late Glen Sigafoose sent propellers rubber power U 0 ow U U1/20 TH SCALE XCUMENTAK OF NOTABLE FAIRCHILDS TA2VDWGS GEORGE H CLAPP CENTRAL SOUAIIE NY /3036I INFO 2100 -REFUNDED WITH ORDERS hundred Marissas Bob Peck Peck-Polymers Frank Zaic also contributed project FF Duration/Meuser Continued jaqe 67 rearward allowing engage hole nose block beginning sound about exciting patent application Also after winding locking pin left side Rogers drawing pushed hole nose block prop allowed rotate torque until pin locks release locking pin flier rotates prop against torque allowing spring push pin out spring wire tubing sizes have carefully worked out can probably adap ted hub choice Rogers entire design bit beyond shop facilities Note forward hole locking pin 3/32 diameter rearward 1/16 stop pin hole sizes reversed Easy-does-it engine starter received fol lowing note Charles McCutcheon Back working Glowdriver introduction electric starters amazed people would use anything brutal deli cate models starter well-aligned engine operation smooth alignment bad starter thrashes around tries tear engine out airplane fitted starter -in diameter aligning pin drilled -in hole end spinner see sketch alignment took care itself opera tion always very smooth spinner shaped thus alternative spinner sketch aligning pin would easily find hole doubt would increase drag much product review product review product review two interesting new models glider fans among us Soarer Two-Meter design offers some inter esting aerodynamics all-wood kit featuring bolt-on wing tail simple efficient spoilers Fuse sides onepiece light plyforduability Soarer can flown two three channels flown two three channels deluxe kit complete vac-formed clear canopy tow hook rudder elevator pushrods spoiler actuators Retail price $4495 less ambitious want get out fly Mid wests latest all-foam critter called Lazy Bird first-time builder will like easy assembly bolt-on wing reinforced top-and-bottom spars spacious fuse plywood spine built-in towhook skid experienced pilotwill appre ciate flight characteristics its said fly just well wooden model Thorough step-by-step instructions included Lazy Bird will have merit beginners kit since Sailplanes aregener ally easier fly powered planes especially dont have expert help Lazy Bird requires two-channel radio retails $5995 product review product review product review 1 58 Model Aviation IROWN A23 0-2w ~TINY PEANUT CO-2 ENGINEHE ENGINECHARGER COMPLETE CATALOG $100 PHONE 714 469-8875 o 442 4836 Peck-P Iyfues W BOX 249R -MA LA MESA CALIF 92041 Soarer Lazy Bird Sailplanes Midwest Products Co 400 5 Indiana St Hobart IN 46432 BALSA SHEETS 36 1/16210pk290 3/32210p5358 1/8s210p5385 3/16n210pk435 1/4210pk499 1/16310pSI330 3/32 3 10 pk390 1/8 310 pk480 3/1635pSI275 1/4 n3 5 pS325 5/16 3 5 pSI380 3/8 3 5 pk395 1/2 3 5 pk495 3/4n3 29k280 1 n32 SkI350 1/16 n4 10 pk520 3/32 4 5 pk315 1/8 n45pk360 3/16 n45pk415 1/4 45pSi495 LIGHT 4 6 LB 36 1/163lOpk430 3/32310 pS490 1/9310 pk560 3/16x 35 pk325 1/435 p5375 3/835 pk495 1/235 pk599 MATCHED SHEETS 42 3/32 4 4 pk399 1/944pk429 3/16 44pk459 1/4 44pk499 BALSA SHEETS 48 1/16310 pk440 3/32310 pk515 1/83 10 pSI 635 3/1635 pSI369 1/435 pk425 3/835 951556 1/234 pSI560 1164lOpS660 3/32s45pk419 l/8s45pk475 3/16 45pk547 1/4s45pk600 TRAILING EDGE 36 1416pk200 5/161-1/48pk250 3/81-1/216pk299 1/2 2 4 pk299 BALSA SHEETS 30~ 1/16310pk275 3/32310Ek325 1/83 10 Ek405 1/16n4lOpk200 3/32410pk504 BALSA TRIANGLES 36 1/41/4109k250 3/63/B10pk320 1/21/210pk430 3/4 3/45 ELI209 11Spk275 1/8410 pk590 BALSASTICKS 39~ 1/161/420 pk180 3/321/420 pk190 1/8 sq20 pk1 40 1/B sl/420 pk195 1/8 s 1/220 oS315 3/16 sq20 pk215 1/4 sq20 pk315 1/41/220pk430 3/8Sq10pk225 3/9sl/210pk315 1/2 sq10 pSI360 48 STICKS 25 PINESTICKS 36 1/B sq10 pk125 1/8 s 1/410 pk1 55 1/83/B10 pk200 3/16 sq10 pk16S 1/4 sq10 Ek255 1/43/810 pk295 3/8 sq10 pk370 46 STICKS ADD 25/ BIRCH DOWELS 36 1/610 pk95 3/1610 pk109 1/410 pk1 40 POPLAB LTE PLY 49 1/56 2 pk300 1/8 12 2 pSI600 3PIy BIRCH PLSWOOG4B 1/32121 pSI425 1/16121 pS435 1/8 12 1 pSI450 5 PLY BIRCH48 3/32s121pk570 1/B 12 1pk565 3/16121pk585 1/4 sl 1pk600 FUN FLI4OSTAR STIKLONESTARCOMINGSOON STARBAT onbal S1495 KWIKSTAR $2495 Oa ck e 500 51 Spas 19 40 Esgoe51 Span 19 40 Esgne48 Spas 19- 35 EnReeSALE $1995$1995 1895Eon Canabal54200 Eon 25RCS4895Eon 1BBBRC5400 Kits feature foam wings balsa ply fuse Machine cut parts rugged very Fon 4OBBRC 5700 quick assembly outstanding value. Choice trike gear tail dragger.Eon 45 BBRC5200 Eon Eagle II7500 Riley Wootens UC Combat ShadowfoamcoresS895 accept Visa Master Charge personal checks COD pay Ups 1/2A foam cores $495 Handling charge -$300 add $200 COD 5% tax TX US CurrBncy certainly concur drag business black smithing such spinner alternative would require bit hand drill fear theres will. Nats unofficial FF events Terry Rimert NFFS official Unofficial Events Director sent official Unofficial Events list youll find convenient box elsewhere column Some appropriate might apply either both Indoor Outdoor depending official Indoor events handled should come pass events creeps official Nats events list itll scrubbed Unofficial Events listgot addition expect therell bunch FF Scale events held unofficial basis too want straight scoop plus Rubber Power Speed model plans rules schedule Beat Matsuno iron-on T-shirt write Terry Rimert 367 Orange Ave Baldwin FL 32234 thats official Another rubber winder finally managed borrow new Gaylord 6-to-I winders purchased Sig friend evaluation Borrowing things friendB evaluation sure-fire way collect lot ex-friends anyhow rst off really 6-to-i winder Upon counting output turns vs input turns reckoned seemed bit shy So after short almost bloodless struggle ex-friend knife-bladed case apart counted teeth can remember losing lot potential girlfriends way Two gear-pairs series no surprise 24-teeth-to-lO-teeth Dig out calculator punch 24/lOx 24/10 push omofl button try again get 6 Nope get 576 submit 576 6 Oh well 4% short isnt much nowadays Besides modelers just go turns-on-the-winder judge whether theyre winding fullythe actual turns-in-the-motor rather academic having already forced crawl inside little beastie decided walk around bit have look spied gob grease two faces gears teeth grease might some good shafts thrust washers seemed have lubed bit couldnt resist slopping little Lubriplate gear teeth noted possibly bit whittling could sneak Sig ball-bearing thrust bearing between output gear housing Such modification might put World Class whether could doneand would worth fuss bother gamble bottom line however well works turns Out according distinguished panel ofjudges just fine wound repeat edly breaking point loop 3/16-in rubber seemed smooth way Such motor produces about much torque would feel comfortable using such small handful winder anyhow advertis ing gives few clues its intended use seems smallish sport models Peanut Scale such would better suited overall ratio closer 10 15 rather 6 6 whale leg up 4 PS Gaylord winder available hobby shops mail-order outfits catering Free Flighters Check directory appeared May June 1981 issues Tri-winglets revisited Immediately upon sub mitting good three better item regarding winglets May issue shot letter off Chief Technical Consultant NASAs W Hewitt Phillips inquiring about potential such stuff FF models reply reads part received letter inquiring about tip feathers Wing tip vanes similar ones show tested Cranfield England after left have seen magazine articles technical report apparently quite effective increasing effective aspect ratio though course increased actual aspect ratio too some extent As tested Moraine- Saulnier Paris jet trainer used stu dent instruction Cranfield vanes radiated tip tank TZiqhr l3ox edm 7odesa $9900 / VISA DELIVERED Four Folding Legs Wing & Fuselage Holders Add $400 Shipping Calif 6% Tax RAC Products408 274-1 915 3200 Knightswood Way 6 San Jose CA 95148 NEW FUEL fuel Blue Flame gives youedge performance BLUE FLAME fuels made highest quality ingredients give engine Best Performance Longest Life Made blend synthetic castor beet possible lubrication Oet6rgsnt action cut varnish muffler 4 Gallon Case MIX OR MATCH PER GALLONDrum 5%$535 Write 10%$605 call 15%$670 st 25%$850drum orices No COD FOB Englewood Check Chargecard Money Order Only Send FREE Catalog Shipping Cost Per Case UPS Call UPS zone 2672 WEST HAMPDEN / ENGLEWOOD CO 80110 PHONE 303 789-9411 July 1982 159 2- 426 3- 513 4- 630 5 759 6- 946 7-1148 8- 1376 Original Developer- BY GIBBS HOBBY & RESEAKUl-I The Factory Trained Authorized Master Service Dealer r7 Year LmIted Pre-Dnlled Props Avail Ask About Custom- Built KIORITZ Engines Deep Fins Optimum Cooling 21/4 Flywheel Small Magneto 1 5/8 Six Bolt Aluminum Hub 242 cc C 397cc 32HP 8000 tprn Weight 6 lb Carb Needles &Throttle Accessible Engine Running [T1 IDon Godfrey 1722I76J Points Sealed Rear Housing $19995 pay shIp pre-paid orders Mufflers Now Available DEALERS WELCOME sell Reornge cc Crack Caged Rollers Rod acd Protoc Pin GIBBS HOBBY & RESEARCH 6195 Hillfield St NW N CANTON OHIO 44720 Phone 216 499-8854 after 600 PM dont have much hope tip-feathers would benefit models because low Rey nolds numbers vanes possibly large interference drag between wouldnt want discourage anyone trying turns out smidgin information about tip-feathers appeared terminal alas issue AeromodellerAnnuai 1978-79 E F Bucks article Bird Aerodynamics Ill check further anything good ever comes Novice Pennyplane prop built incorporating prop tiplets built shortly after Whitcombs reports first appeared can guarantee Ill very first let know about Round wing-tippers arise February column mentioned Erv Rodemskys proposal changing rules FAI World Champion ships Indoor competition proposal created predictable fuss has backed down bit thats beside point Id like address discussions following ideas seem agreed upon less 1 Maximum span-and-chord rules lot easier administer maximum area rules 2 maximum span-and-chord rules invoked everybody will build models rectangular wings certainly agree No I agree No 2 least short run will prevail experience Easy B demonstrates last time saw Easy B square nearly-square tips submit maximum span-andchord rules square tips dead wrong So come winning Easy B models have square-ish tips Easy Everybody agrees mini mum-weight maximum chord-and-span rules need area can get expert fliers believe So expert fliers build square-tip models win win because expert fliers despite crummy wing tips rummy isnt going beat expert flier has efficient wing tips Everyone notices Mr Expert Flier wins lot Mr Expert F uses square wing tips everybody copies No asks Mr EF mightnt better crummy square tips Mr EF rock own boat elliptical-planform wings have ellip tical lift distribution rectangular-planform wings have rectangular lift distribution pigs eye have lift distribution far elliptical rectangular extra 22% area get going elliptical rectangular planform creates per haps 5% lift say little bit helps True lift good drag baa extra 22% wing area still contributes its full share skin-friction drag low Reynolds numbers Indoor wings work skin friction mainly large So given constraints maximum spanand-chord rule what optimum shape Id guess something about halfway between elliptical rectangular chord distribution would awfully close Frank Zaic figured out help about 1933 con soling thing about optimums can miss quite lot still hurt much agree tenth what have said have also agree within constraints maximum span-and-chord rule square miles area remaining experimentation What have said about lift distribution applies flat wing no twist So what about twist whole lot itself Id guess What about dihedral None . unlikely bit tribute single break center just prop up last few inches what Winglets iginally defined see column August 1977 issue likely such low Reynolds numbers about short tips steep dihedral smidgin washout perhaps toeing-out dihedral-break rib es tip bit winglet since must have bit dihedral anyhow make pay its way little notions about what right might totally wrong Im dead sure square tips bit less right feel sure long run given head once square-tip syn drome has exorcised modelers would veer away square tips although might always succeed would always have hell lot fun trying has ever editorial often read articles author says did think really tees otV2 comes oft sort share-the-blame gambit IfI say some thing wrongorsomethingwith disagree dont blame blame us Id like make clear Iwrite column nowe involved although occasionally slip syndrome myself could logically imagined casual reader what might say column represents corporate opinion AMA Sunlight thro Poetry sMGO Par 049 46 Wingspan superb genlir old Megow kit e Dealers ribu 703 573-u 160 Model Aviation SPECIFICATIONS WaIbro Pcctp Cath 3 Ricg Pistoc HOT STUFFM VIDEO-TIPS FREE FOR UP TO 60 DAYS ONE HOUR VHS CASSETTE CLUB MEETINGS HOBBY SHOPS DISTRIBUTORS ORGANIZATIONS $3000 refundable deposit requIred order Send name address phone check Satellite City PO Box 836 Simi CA 93062 -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW
Edition: Model Aviation - 1982/07
Page Numbers: 66, 67, 158, 159, 160, 161
Free Flight DURA TION Bob Meuser THE MONTREAL STOP Its funny go 10 years anyone mentioning particular subject get three letters same mail asking about So has Montreal stop version Montreal stop shown drawing developed Roger Gregory Wakefield Rubber model Roger has similar much lighter versionit uses bent sheetaluminum hub rather milled-out bar stock Helicopt wtogyn nitho nched Rubber nce ne er Speed Rubber -power Di Vlaxer Rubber Mulvihill models blade attachment Roger has using years has proven reliable Roger says whole shebang can made electric drill hand tools us might have bit difficulty doing way basic Montreal stop features Rogers however can readily adapted bar-stock hub sold NFFS Supplies Montreal stop features Gregorys version stick pretty closely original ones appeared early Sixties dont know name comes Ive heard said really invented Los Angeles According Free Flight News England device subject patent filed USSR 1978 Darn weve scooped again Most readers must familiar classic tension stop used Rubber models since early Thirties pin sticking out back nose plug engages arm extending prop shaft prop shaft free slide fore aft through prop hub spring-loaded forward against tension rubber motor ec/v GT Aua 9 5ocAE7$ -IA TCA O/LL5 W/ ri-i F/A-7z/dee BLAL &dEC/-/ D6kVLL 4/ALL 4L TUBING SLIT TZI&/NG 6s/o6 7e2 Gg/ 72 WOV - 5QLOQ aEA5s S IL VEjEPcA5IN cve EeW/EE 7 Y9 AL SA &/ANee SEA 5 WA 5AE' e eV05 A-tA C19/N~C AL CLAA-1 kI-$7W CA 5GdE 77/S CAAJ ALL &e DcNe 14//7Y-/ LeTC7 L2eILL # C67ZeYT57-y~ 5Ae/NG As C/L S Heres Montreal atop Wakefield Bob describes works column thought Rubber models simple 66 Model Aviation Four-Vear-Ola Idarnan Larrer meets mild success VTOing Square OneNo 1 Jack Carters Seven Steps Microfilm series Dick Smith powers Country Boy Fox Combat Special helped Boys designer Jim Clem develop model Larry Kruse photo 5pinncr Startcr modified device once tension rubber motor drops below certain point prop shaft brought dead stop preventing motor going completely slack flopping around allowing prop freewheel fold according its nature essential feature Montreal stop point prop shaft becomes locked depends torque rubber motor rather its tension Further once prop has stopped stays way tension-stop designs isnt true Another feature found true Montreal stop devices locking pin prevents prop rotating after motor wound until f Stnner flier decides time launch operating sequence goes like After motor has wound stop pin right side Rogers drawing pulled out force produced end L-shaped part prop shaft motor torque combined friction holds pin out until motor torque slacks off point spring pushes pin Continued page 158 Hemember tne photo ot urocoolle moryo nourance mooei teatured April issue nose art intrigued Doug Dahike thought hed try little own neatly-executed Sweepette HIG July 198267 John Blair prepares launch oupe de yule Huboer moocH ns Blue Ridge kit Photo Paul Clark Charles McCutcheons method aligns electric starter engine smooth operation Ate-rnativ& BUILT UP AND READY-TO-FLY Higgins Contempo CAP 20L 81 Span & Christen Eagle II 69 Span Write Call Construction Methods Technical Information D R HIGGINS & ASSOCIATES 25403 Via Impresso Valencia CA 91355 Phone 805 254-3017 * Aerocommander SHRIKE 15 ft wingspan Ohio Superstar * *3rd Annual * Hall Fame Giant Plane Fly-In y 17 8- 18 Canton R/C Club field- * The Best GIANT uncontests area * *For Details contact *Bob CampbellSteak fry Saturday night *706 Easton NCanton OH 44720Camping Motels *216-499-5323Refreshments field r " K P P PFFP block right No downthrust needed has built design Gradually build up turns until reach 350 400 maximum safe limit turns can increased rubber stretched helper holding firmly nose hand loosely around rubber can catch it should break burst motor can lot damage covering model should climb too steeply after gentle start hand shim up front tail sliver balsa paper adding necessary Should descend steeply shim up trailing edge tail expect flights longer 30 40 seconds that has designed will riseoff-ground smooth patch quite nicely fun see tail come up gentle climb very docile Much help given late Glen Sigafoose sent propellers rubber power U 0 ow U U1/20 TH SCALE XCUMENTAK OF NOTABLE FAIRCHILDS TA2VDWGS GEORGE H CLAPP CENTRAL SOUAIIE NY /3036I INFO 2100 -REFUNDED WITH ORDERS hundred Marissas Bob Peck Peck-Polymers Frank Zaic also contributed project FF Duration/Meuser Continued jaqe 67 rearward allowing engage hole nose block beginning sound about exciting patent application Also after winding locking pin left side Rogers drawing pushed hole nose block prop allowed rotate torque until pin locks release locking pin flier rotates prop against torque allowing spring push pin out spring wire tubing sizes have carefully worked out can probably adap ted hub choice Rogers entire design bit beyond shop facilities Note forward hole locking pin 3/32 diameter rearward 1/16 stop pin hole sizes reversed Easy-does-it engine starter received fol lowing note Charles McCutcheon Back working Glowdriver introduction electric starters amazed people would use anything brutal deli cate models starter well-aligned engine operation smooth alignment bad starter thrashes around tries tear engine out airplane fitted starter -in diameter aligning pin drilled -in hole end spinner see sketch alignment took care itself opera tion always very smooth spinner shaped thus alternative spinner sketch aligning pin would easily find hole doubt would increase drag much product review product review product review two interesting new models glider fans among us Soarer Two-Meter design offers some inter esting aerodynamics all-wood kit featuring bolt-on wing tail simple efficient spoilers Fuse sides onepiece light plyforduability Soarer can flown two three channels flown two three channels deluxe kit complete vac-formed clear canopy tow hook rudder elevator pushrods spoiler actuators Retail price $4495 less ambitious want get out fly Mid wests latest all-foam critter called Lazy Bird first-time builder will like easy assembly bolt-on wing reinforced top-and-bottom spars spacious fuse plywood spine built-in towhook skid experienced pilotwill appre ciate flight characteristics its said fly just well wooden model Thorough step-by-step instructions included Lazy Bird will have merit beginners kit since Sailplanes aregener ally easier fly powered planes especially dont have expert help Lazy Bird requires two-channel radio retails $5995 product review product review product review 1 58 Model Aviation IROWN A23 0-2w ~TINY PEANUT CO-2 ENGINEHE ENGINECHARGER COMPLETE CATALOG $100 PHONE 714 469-8875 o 442 4836 Peck-P Iyfues W BOX 249R -MA LA MESA CALIF 92041 Soarer Lazy Bird Sailplanes Midwest Products Co 400 5 Indiana St Hobart IN 46432 BALSA SHEETS 36 1/16210pk290 3/32210p5358 1/8s210p5385 3/16n210pk435 1/4210pk499 1/16310pSI330 3/32 3 10 pk390 1/8 310 pk480 3/1635pSI275 1/4 n3 5 pS325 5/16 3 5 pSI380 3/8 3 5 pk395 1/2 3 5 pk495 3/4n3 29k280 1 n32 SkI350 1/16 n4 10 pk520 3/32 4 5 pk315 1/8 n45pk360 3/16 n45pk415 1/4 45pSi495 LIGHT 4 6 LB 36 1/163lOpk430 3/32310 pS490 1/9310 pk560 3/16x 35 pk325 1/435 p5375 3/835 pk495 1/235 pk599 MATCHED SHEETS 42 3/32 4 4 pk399 1/944pk429 3/16 44pk459 1/4 44pk499 BALSA SHEETS 48 1/16310 pk440 3/32310 pk515 1/83 10 pSI 635 3/1635 pSI369 1/435 pk425 3/835 951556 1/234 pSI560 1164lOpS660 3/32s45pk419 l/8s45pk475 3/16 45pk547 1/4s45pk600 TRAILING EDGE 36 1416pk200 5/161-1/48pk250 3/81-1/216pk299 1/2 2 4 pk299 BALSA SHEETS 30~ 1/16310pk275 3/32310Ek325 1/83 10 Ek405 1/16n4lOpk200 3/32410pk504 BALSA TRIANGLES 36 1/41/4109k250 3/63/B10pk320 1/21/210pk430 3/4 3/45 ELI209 11Spk275 1/8410 pk590 BALSASTICKS 39~ 1/161/420 pk180 3/321/420 pk190 1/8 sq20 pk1 40 1/B sl/420 pk195 1/8 s 1/220 oS315 3/16 sq20 pk215 1/4 sq20 pk315 1/41/220pk430 3/8Sq10pk225 3/9sl/210pk315 1/2 sq10 pSI360 48 STICKS 25 PINESTICKS 36 1/B sq10 pk125 1/8 s 1/410 pk1 55 1/83/B10 pk200 3/16 sq10 pk16S 1/4 sq10 Ek255 1/43/810 pk295 3/8 sq10 pk370 46 STICKS ADD 25/ BIRCH DOWELS 36 1/610 pk95 3/1610 pk109 1/410 pk1 40 POPLAB LTE PLY 49 1/56 2 pk300 1/8 12 2 pSI600 3PIy BIRCH PLSWOOG4B 1/32121 pSI425 1/16121 pS435 1/8 12 1 pSI450 5 PLY BIRCH48 3/32s121pk570 1/B 12 1pk565 3/16121pk585 1/4 sl 1pk600 FUN FLI4OSTAR STIKLONESTARCOMINGSOON STARBAT onbal S1495 KWIKSTAR $2495 Oa ck e 500 51 Spas 19 40 Esgoe51 Span 19 40 Esgne48 Spas 19- 35 EnReeSALE $1995$1995 1895Eon Canabal54200 Eon 25RCS4895Eon 1BBBRC5400 Kits feature foam wings balsa ply fuse Machine cut parts rugged very Fon 4OBBRC 5700 quick assembly outstanding value. Choice trike gear tail dragger.Eon 45 BBRC5200 Eon Eagle II7500 Riley Wootens UC Combat ShadowfoamcoresS895 accept Visa Master Charge personal checks COD pay Ups 1/2A foam cores $495 Handling charge -$300 add $200 COD 5% tax TX US CurrBncy certainly concur drag business black smithing such spinner alternative would require bit hand drill fear theres will. Nats unofficial FF events Terry Rimert NFFS official Unofficial Events Director sent official Unofficial Events list youll find convenient box elsewhere column Some appropriate might apply either both Indoor Outdoor depending official Indoor events handled should come pass events creeps official Nats events list itll scrubbed Unofficial Events listgot addition expect therell bunch FF Scale events held unofficial basis too want straight scoop plus Rubber Power Speed model plans rules schedule Beat Matsuno iron-on T-shirt write Terry Rimert 367 Orange Ave Baldwin FL 32234 thats official Another rubber winder finally managed borrow new Gaylord 6-to-I winders purchased Sig friend evaluation Borrowing things friendB evaluation sure-fire way collect lot ex-friends anyhow rst off really 6-to-i winder Upon counting output turns vs input turns reckoned seemed bit shy So after short almost bloodless struggle ex-friend knife-bladed case apart counted teeth can remember losing lot potential girlfriends way Two gear-pairs series no surprise 24-teeth-to-lO-teeth Dig out calculator punch 24/lOx 24/10 push omofl button try again get 6 Nope get 576 submit 576 6 Oh well 4% short isnt much nowadays Besides modelers just go turns-on-the-winder judge whether theyre winding fullythe actual turns-in-the-motor rather academic having already forced crawl inside little beastie decided walk around bit have look spied gob grease two faces gears teeth grease might some good shafts thrust washers seemed have lubed bit couldnt resist slopping little Lubriplate gear teeth noted possibly bit whittling could sneak Sig ball-bearing thrust bearing between output gear housing Such modification might put World Class whether could doneand would worth fuss bother gamble bottom line however well works turns Out according distinguished panel ofjudges just fine wound repeat edly breaking point loop 3/16-in rubber seemed smooth way Such motor produces about much torque would feel comfortable using such small handful winder anyhow advertis ing gives few clues its intended use seems smallish sport models Peanut Scale such would better suited overall ratio closer 10 15 rather 6 6 whale leg up 4 PS Gaylord winder available hobby shops mail-order outfits catering Free Flighters Check directory appeared May June 1981 issues Tri-winglets revisited Immediately upon sub mitting good three better item regarding winglets May issue shot letter off Chief Technical Consultant NASAs W Hewitt Phillips inquiring about potential such stuff FF models reply reads part received letter inquiring about tip feathers Wing tip vanes similar ones show tested Cranfield England after left have seen magazine articles technical report apparently quite effective increasing effective aspect ratio though course increased actual aspect ratio too some extent As tested Moraine- Saulnier Paris jet trainer used stu dent instruction Cranfield vanes radiated tip tank TZiqhr l3ox edm 7odesa $9900 / VISA DELIVERED Four Folding Legs Wing & Fuselage Holders Add $400 Shipping Calif 6% Tax RAC Products408 274-1 915 3200 Knightswood Way 6 San Jose CA 95148 NEW FUEL fuel Blue Flame gives youedge performance BLUE FLAME fuels made highest quality ingredients give engine Best Performance Longest Life Made blend synthetic castor beet possible lubrication Oet6rgsnt action cut varnish muffler 4 Gallon Case MIX OR MATCH PER GALLONDrum 5%$535 Write 10%$605 call 15%$670 st 25%$850drum orices No COD FOB Englewood Check Chargecard Money Order Only Send FREE Catalog Shipping Cost Per Case UPS Call UPS zone 2672 WEST HAMPDEN / ENGLEWOOD CO 80110 PHONE 303 789-9411 July 1982 159 2- 426 3- 513 4- 630 5 759 6- 946 7-1148 8- 1376 Original Developer- BY GIBBS HOBBY & RESEAKUl-I The Factory Trained Authorized Master Service Dealer r7 Year LmIted Pre-Dnlled Props Avail Ask About Custom- Built KIORITZ Engines Deep Fins Optimum Cooling 21/4 Flywheel Small Magneto 1 5/8 Six Bolt Aluminum Hub 242 cc C 397cc 32HP 8000 tprn Weight 6 lb Carb Needles &Throttle Accessible Engine Running [T1 IDon Godfrey 1722I76J Points Sealed Rear Housing $19995 pay shIp pre-paid orders Mufflers Now Available DEALERS WELCOME sell Reornge cc Crack Caged Rollers Rod acd Protoc Pin GIBBS HOBBY & RESEARCH 6195 Hillfield St NW N CANTON OHIO 44720 Phone 216 499-8854 after 600 PM dont have much hope tip-feathers would benefit models because low Rey nolds numbers vanes possibly large interference drag between wouldnt want discourage anyone trying turns out smidgin information about tip-feathers appeared terminal alas issue AeromodellerAnnuai 1978-79 E F Bucks article Bird Aerodynamics Ill check further anything good ever comes Novice Pennyplane prop built incorporating prop tiplets built shortly after Whitcombs reports first appeared can guarantee Ill very first let know about Round wing-tippers arise February column mentioned Erv Rodemskys proposal changing rules FAI World Champion ships Indoor competition proposal created predictable fuss has backed down bit thats beside point Id like address discussions following ideas seem agreed upon less 1 Maximum span-and-chord rules lot easier administer maximum area rules 2 maximum span-and-chord rules invoked everybody will build models rectangular wings certainly agree No I agree No 2 least short run will prevail experience Easy B demonstrates last time saw Easy B square nearly-square tips submit maximum span-andchord rules square tips dead wrong So come winning Easy B models have square-ish tips Easy Everybody agrees mini mum-weight maximum chord-and-span rules need area can get expert fliers believe So expert fliers build square-tip models win win because expert fliers despite crummy wing tips rummy isnt going beat expert flier has efficient wing tips Everyone notices Mr Expert Flier wins lot Mr Expert F uses square wing tips everybody copies No asks Mr EF mightnt better crummy square tips Mr EF rock own boat elliptical-planform wings have ellip tical lift distribution rectangular-planform wings have rectangular lift distribution pigs eye have lift distribution far elliptical rectangular extra 22% area get going elliptical rectangular planform creates per haps 5% lift say little bit helps True lift good drag baa extra 22% wing area still contributes its full share skin-friction drag low Reynolds numbers Indoor wings work skin friction mainly large So given constraints maximum spanand-chord rule what optimum shape Id guess something about halfway between elliptical rectangular chord distribution would awfully close Frank Zaic figured out help about 1933 con soling thing about optimums can miss quite lot still hurt much agree tenth what have said have also agree within constraints maximum span-and-chord rule square miles area remaining experimentation What have said about lift distribution applies flat wing no twist So what about twist whole lot itself Id guess What about dihedral None . unlikely bit tribute single break center just prop up last few inches what Winglets iginally defined see column August 1977 issue likely such low Reynolds numbers about short tips steep dihedral smidgin washout perhaps toeing-out dihedral-break rib es tip bit winglet since must have bit dihedral anyhow make pay its way little notions about what right might totally wrong Im dead sure square tips bit less right feel sure long run given head once square-tip syn drome has exorcised modelers would veer away square tips although might always succeed would always have hell lot fun trying has ever editorial often read articles author says did think really tees otV2 comes oft sort share-the-blame gambit IfI say some thing wrongorsomethingwith disagree dont blame blame us Id like make clear Iwrite column nowe involved although occasionally slip syndrome myself could logically imagined casual reader what might say column represents corporate opinion AMA Sunlight thro Poetry sMGO Par 049 46 Wingspan superb genlir old Megow kit e Dealers ribu 703 573-u 160 Model Aviation SPECIFICATIONS WaIbro Pcctp Cath 3 Ricg Pistoc HOT STUFFM VIDEO-TIPS FREE FOR UP TO 60 DAYS ONE HOUR VHS CASSETTE CLUB MEETINGS HOBBY SHOPS DISTRIBUTORS ORGANIZATIONS $3000 refundable deposit requIred order Send name address phone check Satellite City PO Box 836 Simi CA 93062 -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW
Edition: Model Aviation - 1982/07
Page Numbers: 66, 67, 158, 159, 160, 161
Free Flight DURA TION Bob Meuser THE MONTREAL STOP Its funny go 10 years anyone mentioning particular subject get three letters same mail asking about So has Montreal stop version Montreal stop shown drawing developed Roger Gregory Wakefield Rubber model Roger has similar much lighter versionit uses bent sheetaluminum hub rather milled-out bar stock Helicopt wtogyn nitho nched Rubber nce ne er Speed Rubber -power Di Vlaxer Rubber Mulvihill models blade attachment Roger has using years has proven reliable Roger says whole shebang can made electric drill hand tools us might have bit difficulty doing way basic Montreal stop features Rogers however can readily adapted bar-stock hub sold NFFS Supplies Montreal stop features Gregorys version stick pretty closely original ones appeared early Sixties dont know name comes Ive heard said really invented Los Angeles According Free Flight News England device subject patent filed USSR 1978 Darn weve scooped again Most readers must familiar classic tension stop used Rubber models since early Thirties pin sticking out back nose plug engages arm extending prop shaft prop shaft free slide fore aft through prop hub spring-loaded forward against tension rubber motor ec/v GT Aua 9 5ocAE7$ -IA TCA O/LL5 W/ ri-i F/A-7z/dee BLAL &dEC/-/ D6kVLL 4/ALL 4L TUBING SLIT TZI&/NG 6s/o6 7e2 Gg/ 72 WOV - 5QLOQ aEA5s S IL VEjEPcA5IN cve EeW/EE 7 Y9 AL SA &/ANee SEA 5 WA 5AE' e eV05 A-tA C19/N~C AL CLAA-1 kI-$7W CA 5GdE 77/S CAAJ ALL &e DcNe 14//7Y-/ LeTC7 L2eILL # C67ZeYT57-y~ 5Ae/NG As C/L S Heres Montreal atop Wakefield Bob describes works column thought Rubber models simple 66 Model Aviation Four-Vear-Ola Idarnan Larrer meets mild success VTOing Square OneNo 1 Jack Carters Seven Steps Microfilm series Dick Smith powers Country Boy Fox Combat Special helped Boys designer Jim Clem develop model Larry Kruse photo 5pinncr Startcr modified device once tension rubber motor drops below certain point prop shaft brought dead stop preventing motor going completely slack flopping around allowing prop freewheel fold according its nature essential feature Montreal stop point prop shaft becomes locked depends torque rubber motor rather its tension Further once prop has stopped stays way tension-stop designs isnt true Another feature found true Montreal stop devices locking pin prevents prop rotating after motor wound until f Stnner flier decides time launch operating sequence goes like After motor has wound stop pin right side Rogers drawing pulled out force produced end L-shaped part prop shaft motor torque combined friction holds pin out until motor torque slacks off point spring pushes pin Continued page 158 Hemember tne photo ot urocoolle moryo nourance mooei teatured April issue nose art intrigued Doug Dahike thought hed try little own neatly-executed Sweepette HIG July 198267 John Blair prepares launch oupe de yule Huboer moocH ns Blue Ridge kit Photo Paul Clark Charles McCutcheons method aligns electric starter engine smooth operation Ate-rnativ& BUILT UP AND READY-TO-FLY Higgins Contempo CAP 20L 81 Span & Christen Eagle II 69 Span Write Call Construction Methods Technical Information D R HIGGINS & ASSOCIATES 25403 Via Impresso Valencia CA 91355 Phone 805 254-3017 * Aerocommander SHRIKE 15 ft wingspan Ohio Superstar * *3rd Annual * Hall Fame Giant Plane Fly-In y 17 8- 18 Canton R/C Club field- * The Best GIANT uncontests area * *For Details contact *Bob CampbellSteak fry Saturday night *706 Easton NCanton OH 44720Camping Motels *216-499-5323Refreshments field r " K P P PFFP block right No downthrust needed has built design Gradually build up turns until reach 350 400 maximum safe limit turns can increased rubber stretched helper holding firmly nose hand loosely around rubber can catch it should break burst motor can lot damage covering model should climb too steeply after gentle start hand shim up front tail sliver balsa paper adding necessary Should descend steeply shim up trailing edge tail expect flights longer 30 40 seconds that has designed will riseoff-ground smooth patch quite nicely fun see tail come up gentle climb very docile Much help given late Glen Sigafoose sent propellers rubber power U 0 ow U U1/20 TH SCALE XCUMENTAK OF NOTABLE FAIRCHILDS TA2VDWGS GEORGE H CLAPP CENTRAL SOUAIIE NY /3036I INFO 2100 -REFUNDED WITH ORDERS hundred Marissas Bob Peck Peck-Polymers Frank Zaic also contributed project FF Duration/Meuser Continued jaqe 67 rearward allowing engage hole nose block beginning sound about exciting patent application Also after winding locking pin left side Rogers drawing pushed hole nose block prop allowed rotate torque until pin locks release locking pin flier rotates prop against torque allowing spring push pin out spring wire tubing sizes have carefully worked out can probably adap ted hub choice Rogers entire design bit beyond shop facilities Note forward hole locking pin 3/32 diameter rearward 1/16 stop pin hole sizes reversed Easy-does-it engine starter received fol lowing note Charles McCutcheon Back working Glowdriver introduction electric starters amazed people would use anything brutal deli cate models starter well-aligned engine operation smooth alignment bad starter thrashes around tries tear engine out airplane fitted starter -in diameter aligning pin drilled -in hole end spinner see sketch alignment took care itself opera tion always very smooth spinner shaped thus alternative spinner sketch aligning pin would easily find hole doubt would increase drag much product review product review product review two interesting new models glider fans among us Soarer Two-Meter design offers some inter esting aerodynamics all-wood kit featuring bolt-on wing tail simple efficient spoilers Fuse sides onepiece light plyforduability Soarer can flown two three channels flown two three channels deluxe kit complete vac-formed clear canopy tow hook rudder elevator pushrods spoiler actuators Retail price $4495 less ambitious want get out fly Mid wests latest all-foam critter called Lazy Bird first-time builder will like easy assembly bolt-on wing reinforced top-and-bottom spars spacious fuse plywood spine built-in towhook skid experienced pilotwill appre ciate flight characteristics its said fly just well wooden model Thorough step-by-step instructions included Lazy Bird will have merit beginners kit since Sailplanes aregener ally easier fly powered planes especially dont have expert help Lazy Bird requires two-channel radio retails $5995 product review product review product review 1 58 Model Aviation IROWN A23 0-2w ~TINY PEANUT CO-2 ENGINEHE ENGINECHARGER COMPLETE CATALOG $100 PHONE 714 469-8875 o 442 4836 Peck-P Iyfues W BOX 249R -MA LA MESA CALIF 92041 Soarer Lazy Bird Sailplanes Midwest Products Co 400 5 Indiana St Hobart IN 46432 BALSA SHEETS 36 1/16210pk290 3/32210p5358 1/8s210p5385 3/16n210pk435 1/4210pk499 1/16310pSI330 3/32 3 10 pk390 1/8 310 pk480 3/1635pSI275 1/4 n3 5 pS325 5/16 3 5 pSI380 3/8 3 5 pk395 1/2 3 5 pk495 3/4n3 29k280 1 n32 SkI350 1/16 n4 10 pk520 3/32 4 5 pk315 1/8 n45pk360 3/16 n45pk415 1/4 45pSi495 LIGHT 4 6 LB 36 1/163lOpk430 3/32310 pS490 1/9310 pk560 3/16x 35 pk325 1/435 p5375 3/835 pk495 1/235 pk599 MATCHED SHEETS 42 3/32 4 4 pk399 1/944pk429 3/16 44pk459 1/4 44pk499 BALSA SHEETS 48 1/16310 pk440 3/32310 pk515 1/83 10 pSI 635 3/1635 pSI369 1/435 pk425 3/835 951556 1/234 pSI560 1164lOpS660 3/32s45pk419 l/8s45pk475 3/16 45pk547 1/4s45pk600 TRAILING EDGE 36 1416pk200 5/161-1/48pk250 3/81-1/216pk299 1/2 2 4 pk299 BALSA SHEETS 30~ 1/16310pk275 3/32310Ek325 1/83 10 Ek405 1/16n4lOpk200 3/32410pk504 BALSA TRIANGLES 36 1/41/4109k250 3/63/B10pk320 1/21/210pk430 3/4 3/45 ELI209 11Spk275 1/8410 pk590 BALSASTICKS 39~ 1/161/420 pk180 3/321/420 pk190 1/8 sq20 pk1 40 1/B sl/420 pk195 1/8 s 1/220 oS315 3/16 sq20 pk215 1/4 sq20 pk315 1/41/220pk430 3/8Sq10pk225 3/9sl/210pk315 1/2 sq10 pSI360 48 STICKS 25 PINESTICKS 36 1/B sq10 pk125 1/8 s 1/410 pk1 55 1/83/B10 pk200 3/16 sq10 pk16S 1/4 sq10 Ek255 1/43/810 pk295 3/8 sq10 pk370 46 STICKS ADD 25/ BIRCH DOWELS 36 1/610 pk95 3/1610 pk109 1/410 pk1 40 POPLAB LTE PLY 49 1/56 2 pk300 1/8 12 2 pSI600 3PIy BIRCH PLSWOOG4B 1/32121 pSI425 1/16121 pS435 1/8 12 1 pSI450 5 PLY BIRCH48 3/32s121pk570 1/B 12 1pk565 3/16121pk585 1/4 sl 1pk600 FUN FLI4OSTAR STIKLONESTARCOMINGSOON STARBAT onbal S1495 KWIKSTAR $2495 Oa ck e 500 51 Spas 19 40 Esgoe51 Span 19 40 Esgne48 Spas 19- 35 EnReeSALE $1995$1995 1895Eon Canabal54200 Eon 25RCS4895Eon 1BBBRC5400 Kits feature foam wings balsa ply fuse Machine cut parts rugged very Fon 4OBBRC 5700 quick assembly outstanding value. Choice trike gear tail dragger.Eon 45 BBRC5200 Eon Eagle II7500 Riley Wootens UC Combat ShadowfoamcoresS895 accept Visa Master Charge personal checks COD pay Ups 1/2A foam cores $495 Handling charge -$300 add $200 COD 5% tax TX US CurrBncy certainly concur drag business black smithing such spinner alternative would require bit hand drill fear theres will. Nats unofficial FF events Terry Rimert NFFS official Unofficial Events Director sent official Unofficial Events list youll find convenient box elsewhere column Some appropriate might apply either both Indoor Outdoor depending official Indoor events handled should come pass events creeps official Nats events list itll scrubbed Unofficial Events listgot addition expect therell bunch FF Scale events held unofficial basis too want straight scoop plus Rubber Power Speed model plans rules schedule Beat Matsuno iron-on T-shirt write Terry Rimert 367 Orange Ave Baldwin FL 32234 thats official Another rubber winder finally managed borrow new Gaylord 6-to-I winders purchased Sig friend evaluation Borrowing things friendB evaluation sure-fire way collect lot ex-friends anyhow rst off really 6-to-i winder Upon counting output turns vs input turns reckoned seemed bit shy So after short almost bloodless struggle ex-friend knife-bladed case apart counted teeth can remember losing lot potential girlfriends way Two gear-pairs series no surprise 24-teeth-to-lO-teeth Dig out calculator punch 24/lOx 24/10 push omofl button try again get 6 Nope get 576 submit 576 6 Oh well 4% short isnt much nowadays Besides modelers just go turns-on-the-winder judge whether theyre winding fullythe actual turns-in-the-motor rather academic having already forced crawl inside little beastie decided walk around bit have look spied gob grease two faces gears teeth grease might some good shafts thrust washers seemed have lubed bit couldnt resist slopping little Lubriplate gear teeth noted possibly bit whittling could sneak Sig ball-bearing thrust bearing between output gear housing Such modification might put World Class whether could doneand would worth fuss bother gamble bottom line however well works turns Out according distinguished panel ofjudges just fine wound repeat edly breaking point loop 3/16-in rubber seemed smooth way Such motor produces about much torque would feel comfortable using such small handful winder anyhow advertis ing gives few clues its intended use seems smallish sport models Peanut Scale such would better suited overall ratio closer 10 15 rather 6 6 whale leg up 4 PS Gaylord winder available hobby shops mail-order outfits catering Free Flighters Check directory appeared May June 1981 issues Tri-winglets revisited Immediately upon sub mitting good three better item regarding winglets May issue shot letter off Chief Technical Consultant NASAs W Hewitt Phillips inquiring about potential such stuff FF models reply reads part received letter inquiring about tip feathers Wing tip vanes similar ones show tested Cranfield England after left have seen magazine articles technical report apparently quite effective increasing effective aspect ratio though course increased actual aspect ratio too some extent As tested Moraine- Saulnier Paris jet trainer used stu dent instruction Cranfield vanes radiated tip tank TZiqhr l3ox edm 7odesa $9900 / VISA DELIVERED Four Folding Legs Wing & Fuselage Holders Add $400 Shipping Calif 6% Tax RAC Products408 274-1 915 3200 Knightswood Way 6 San Jose CA 95148 NEW FUEL fuel Blue Flame gives youedge performance BLUE FLAME fuels made highest quality ingredients give engine Best Performance Longest Life Made blend synthetic castor beet possible lubrication Oet6rgsnt action cut varnish muffler 4 Gallon Case MIX OR MATCH PER GALLONDrum 5%$535 Write 10%$605 call 15%$670 st 25%$850drum orices No COD FOB Englewood Check Chargecard Money Order Only Send FREE Catalog Shipping Cost Per Case UPS Call UPS zone 2672 WEST HAMPDEN / ENGLEWOOD CO 80110 PHONE 303 789-9411 July 1982 159 2- 426 3- 513 4- 630 5 759 6- 946 7-1148 8- 1376 Original Developer- BY GIBBS HOBBY & RESEAKUl-I The Factory Trained Authorized Master Service Dealer r7 Year LmIted Pre-Dnlled Props Avail Ask About Custom- Built KIORITZ Engines Deep Fins Optimum Cooling 21/4 Flywheel Small Magneto 1 5/8 Six Bolt Aluminum Hub 242 cc C 397cc 32HP 8000 tprn Weight 6 lb Carb Needles &Throttle Accessible Engine Running [T1 IDon Godfrey 1722I76J Points Sealed Rear Housing $19995 pay shIp pre-paid orders Mufflers Now Available DEALERS WELCOME sell Reornge cc Crack Caged Rollers Rod acd Protoc Pin GIBBS HOBBY & RESEARCH 6195 Hillfield St NW N CANTON OHIO 44720 Phone 216 499-8854 after 600 PM dont have much hope tip-feathers would benefit models because low Rey nolds numbers vanes possibly large interference drag between wouldnt want discourage anyone trying turns out smidgin information about tip-feathers appeared terminal alas issue AeromodellerAnnuai 1978-79 E F Bucks article Bird Aerodynamics Ill check further anything good ever comes Novice Pennyplane prop built incorporating prop tiplets built shortly after Whitcombs reports first appeared can guarantee Ill very first let know about Round wing-tippers arise February column mentioned Erv Rodemskys proposal changing rules FAI World Champion ships Indoor competition proposal created predictable fuss has backed down bit thats beside point Id like address discussions following ideas seem agreed upon less 1 Maximum span-and-chord rules lot easier administer maximum area rules 2 maximum span-and-chord rules invoked everybody will build models rectangular wings certainly agree No I agree No 2 least short run will prevail experience Easy B demonstrates last time saw Easy B square nearly-square tips submit maximum span-andchord rules square tips dead wrong So come winning Easy B models have square-ish tips Easy Everybody agrees mini mum-weight maximum chord-and-span rules need area can get expert fliers believe So expert fliers build square-tip models win win because expert fliers despite crummy wing tips rummy isnt going beat expert flier has efficient wing tips Everyone notices Mr Expert Flier wins lot Mr Expert F uses square wing tips everybody copies No asks Mr EF mightnt better crummy square tips Mr EF rock own boat elliptical-planform wings have ellip tical lift distribution rectangular-planform wings have rectangular lift distribution pigs eye have lift distribution far elliptical rectangular extra 22% area get going elliptical rectangular planform creates per haps 5% lift say little bit helps True lift good drag baa extra 22% wing area still contributes its full share skin-friction drag low Reynolds numbers Indoor wings work skin friction mainly large So given constraints maximum spanand-chord rule what optimum shape Id guess something about halfway between elliptical rectangular chord distribution would awfully close Frank Zaic figured out help about 1933 con soling thing about optimums can miss quite lot still hurt much agree tenth what have said have also agree within constraints maximum span-and-chord rule square miles area remaining experimentation What have said about lift distribution applies flat wing no twist So what about twist whole lot itself Id guess What about dihedral None . unlikely bit tribute single break center just prop up last few inches what Winglets iginally defined see column August 1977 issue likely such low Reynolds numbers about short tips steep dihedral smidgin washout perhaps toeing-out dihedral-break rib es tip bit winglet since must have bit dihedral anyhow make pay its way little notions about what right might totally wrong Im dead sure square tips bit less right feel sure long run given head once square-tip syn drome has exorcised modelers would veer away square tips although might always succeed would always have hell lot fun trying has ever editorial often read articles author says did think really tees otV2 comes oft sort share-the-blame gambit IfI say some thing wrongorsomethingwith disagree dont blame blame us Id like make clear Iwrite column nowe involved although occasionally slip syndrome myself could logically imagined casual reader what might say column represents corporate opinion AMA Sunlight thro Poetry sMGO Par 049 46 Wingspan superb genlir old Megow kit e Dealers ribu 703 573-u 160 Model Aviation SPECIFICATIONS WaIbro Pcctp Cath 3 Ricg Pistoc HOT STUFFM VIDEO-TIPS FREE FOR UP TO 60 DAYS ONE HOUR VHS CASSETTE CLUB MEETINGS HOBBY SHOPS DISTRIBUTORS ORGANIZATIONS $3000 refundable deposit requIred order Send name address phone check Satellite City PO Box 836 Simi CA 93062 -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW