5OOPoieci -T 425 _____171 L1 NFFS NEWS month June looms busy National Free Flight Society NFFS June 1-4 kickoff University Tennessee Minidome 116-ft ceiling John son City TN annual US Indoor Championships will 20 official events host unofficial ones well Area hotel dormitory facilities excellent Indoor buffs can send No 10 SASE USIC 1655 Re vere Dr Brookfield WI 53005 informa tive three-page contest packet begin plan vacations accordingly four days Indoor frolic followed first annual week-long NFFS/US Out door Championships June 19-23 Mid America Air Center near Lawrenceville IL Over 60 events card include facets Outdoor Free Flight competitionand like eat both SAM-type bean feed NFFS banquet works number motels both Lawrence ville neighboring Vincennes IN plenty low-cost dormitory space Vincennes University Get entry information early sending No 10 SASE ad dresses AMA Nostalgia Gas eventsA Italiano 1655 Revere Dr Brookfield WI 53005 Old-Timer events FF RCDon Sachtjen RR #5 Box 56B Bloomfield IN 47424 Flying Aces Clubs Flying Scale eventsLin Reichel 3301 Cindy Lane Erie PA 16506 number initial NFFS entry packets sent out before couple items emerged require clarification First contest flyer specifies Category II conditionswhich printing error impossibility Wind direction crop situations will obviously dictate actual competition flight rules probability proper assume Cate latest plan offering Al Lidberg 40-in-span Jumbo Rubber Scale Cessna Airmaster has knockoff wings Plastic 12-in prop available 66 Model Aviation Free plait Duration Harry Murphy 3824 Oakwood Blvd Anderson IN 4601 Zeek chronicles continue month Drawing shows minor differences between two old kit versions Photo has Bob Watson tuning OS Max 15-powered A/B Zeek prior official flight Fall 1988 contest Lawrenceville IL Its large-stab Premium version gory III conditions will exist Second important omission statement six NFFS-sponsored events will broken up Jr/Sr combined Open age categories events Gas Hand-Launched Glider Embryo Rubber P 30 Rubber Pee Wee 30 Peanut Scale Subse quent entry packets have corrected should have received initial distri bution should correct information accor dingly two back-to-back ventures 1989 examples new energy being exerted within NFFS promote Free Flight competi tion national level can show indi vidual support causes attending above affairs well joining/rejoining/re newing membership case may long-established organization Reaffirm support today sending yearly $15 mem bership fee NFFS 6146 E Cactus Wren Rd Scottsdale AZ 85253 Become bona fide Free Flight booster Bob Klipp directs NFFS Plan Service has advised NFFS listing available plans has now updated 1989 new listing includes 165 designs such noteworthy Power designs Jacksons Pilfered Pearl Verbitskys 1987 BE-48 FLC World Champion get yours send No 10 SASE NFFS Plans 10115 Newbold Dr St Louis MO 63137 Bob also offering full-size plans old fa vorite Satellite 1000 reduced price $5 postpaid first two dozen folks der gone price will re vert normal fee $850 NFFS mem bers $950 nonmembers plus 20% post age serious about obtaining plans either price can send full amount can return excess should order arrive before supply special price exhausted Pertinent potpourri version Vie Cunninghams venerable Geodetic Galaxie available once again Kits $2495 postpaid California residents add $162 tax Make checks payable Galaxie Model Co PO Box 4842 Covina CA 91723 original 585 Vies new Maxi scheduled avail able early 1989 well may wish enquire respect latter Should wish introduction uses space age composites model construction new 1989 MRL Model Research Labs catalog must scratch builder does catalog list new construction materi als accompanying pricings such items Kevlar various carbon fiber configurations alu minum wing skins etc became engrossed page after page in-depth descriptions dos/donts respect proper use various materials catalog just listing var ious high-tech materials offers invaluable formation suggesting appropriate uses composite catalog will dis card send $2 Model Research Labs 25108 Marguerite #160 Mission Viejo CA 92692 Youll receive education modern world composites USA FAI FF Team Manager Roger Simpson has raised SOS respect requesting aid form cash donations help outfit cur rent teams needed support equipment Inter ested individuals clubs can send contribu tions him 2625 Queenswood Dr Rancho Cordova CA 95670 funding goals achieved donate can expect team photo team decal return Okay senior citizens chance relive golden youth Peter Mann advises pos tal contest commemorate 50th anniversary Canadian Jimmy Allen Model Airplane originally kitted 1939 Ontario Model Aircraft Company Model Craft ronto currently being reproduced Easybuilt Models Beamsville Ontario can fly things off football field cant bug Out because lack flying site No excuses attributed bad timing will ac cepted either flights may logged anytime between March 1 September 30 1989 no entry fee also fits well within retirees fixed income Send #10 SASE Peter M Mann 36 Sydenham St Guelph Ontario Canada NiH 2W4 get details Al Lidberg offers 1989 version 10page plans catalog featuring latest addition 40-in-span Jumbo Scale Cessna Airmaster Plans exquisite done Al can tradition old days Comet Model Airplane Company catalog dollarbut its free requested send $6 check plan Four pages building structions three-views full-scale air craft also included address AA Lidberg 614 B Fordham Tempe AZ 85283 Tell him Duration sent Zeek chroniclesPart IV Bill Cranfords Premium Manufacturing Company undertook production large-stab A/B Zeek early Fifties enlisted tire less efforts Lew Mahieu getting project moving Revisions made original Air 0 design concept some being quite obvious others subtle ensuing Korean situation caused under standable metal shortage hardwood engine bearers included kit lieu neat black-painted steel mounts trade mark original Air-O kit offering course enlarged stab rudder changes Continued page 168 June 1989 67 Leo Sullivan did nice job 1AA Nostalgia Gas rendition Hal deBolts vintage Air foiler design Eye-catching color scheme dark green white Space Age materials find way model building constructions about John Voorhees built iAA Gas ship butcher shop meat platters Meredith Chamberlain test runs OS Max 19 Ron Warring-designed Crescendo Wright Field meet Dayton OH British designs becoming popular NosGas Modeling Accessories MASTER AIRSCREW5 Balsa Stripper Precision stripwood easy Balsa Strip per Strips up 1/2 wide 1/4 thick can cut quickly accurately sheet stock vernier wheel advances 1/32 precise adjust ment stripper uses std type 11 hobby blade $495 suggested retail Razor Master iseiew w 1j~lane Plane uses heavy-duty industrial blade held place two locating screws allowing cutting depth set very rigidly accurately Use rounding smoothing contours fuselages cowlings shaping edges thinning strips etc $495 sug gested retail Replacement blades available stock no MA2101 $149 pack 3 Line Filter fuel filter outstanding value has threaded two-part alum num body 100-mesh stainless screen removeable easy cleaning $119 suggested retail Direct Drive 05 Prop Adaptor all-aluminum prop adaptor designed 06 electric motors recommended use Master Airscrew 7x4 7x6 8x4 8x6 propellers $395 suggested retail See Hobby Dealer WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 3I111 1989 Unlbed La AUGUST 20 oStatic Display Fun Fly Swap Shop Air Show Team Competition Information Call 1312USk SHOW 30 Flying DISC V-STOL SUPERIOR Small Field 8- FUN FLY Aircraft STABLE PREDICTABLE 8-AGILE $43 plus piing TX Res add 7% soles fax VISA MIC Foam 8- LIte Ply Construction ELEVON Mixer Included 25- 40cid 3-35 lbs Accurate QUALITY Materials Boston Coupe/Saulsbury Continued page 165 section plastic window area original model rare birds say practically flew right off board As longer motors installed however small amount clay needed nose its first formal contest Boston Coupe took first place flight time 48 seconds stable flier despite its lack dihedral looks very appealing air outdoor flying would add n dihe dral per tip stability first flights used loop %2 rubber about twice length plane Build Boston Coupe let know does Im sure youll pleased results FF Duration/Murphy Continued page 67 intended improve stability de crease size single wheel improved models finished appearance Whereas fuse lage moments remained relatively unchanged fuselage profile itself simplified somewhat resulting little less vertical height difference between stab wing locations Both ver sions depicted glow-powered McCoy 19 up front Air-O kit plans also showed locations ignition coil batteries indicating some first models may have built uti lizing ignition engines power contrast famous Zeek wing came through transformation completely unscathed due convenience utilizing steel-rule rib dies obtained Air-O anything else accompanying drawing indi cates both comparable differences sim ilarities two vintage production kits Fullsize plans both versions A/B Zeek kits available number plan sources Although Lew Mahieu aided bringing itial 1AA Zeek kit hobby shop shelves under Premium Manufacturing Co banner per sonal involvement original Zeek design concept drawing close Premium Lew also involved producing small RTF ready-to-flyRAfcM model supplied Los Angeles Ex aminer newspaper Power K&B 035 glow MIN Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin Bonded Model Products Box 10998 Suite 543 Austin TX 78766 512 250-1420 engine famed newspaper presented youthful paper carriers awards three newspaper subscription starts signed up Lew K&B 1949-53 respon sible kit venture com pany noted its model engine production Lews famous A/B Kiwi design design intended matched new K&B 15 Green Head companys contribu tion fledgling FAL Power competition day Lews talents varied ef forts utilized K&B knowledge fuels engine repair drafting art work K&Bs monthly magazine ad vertisementsnot mention laurels brought upon himself company consistent contest wins K&B eventually sold its interests Kiwi Paul K Guillow Co reproduced original A/B-size kit offered /2A version own Whereas Lew eventually phased out model building active model competition shortly after mid-Fifties left mark history Free Flight man ac complishments Premiums initial Zeek kit offering first flat-bottomed-airfoil spinoffs original undercamber-airfoil Zeek concept Bill Cranford stated writer 1983 letter reason flat-bottomed rib configura tion utilized instance was new building steel-rule dies lot simpler make wing ribs flat bot tom attempting some critical contour Thus another era Zeek legend born accident design ver sions flat-bottomed-airfoil Zeeks Well get topic next meet pages another chapter Zeek story Newsletter spotlight zoom another Free Flight newsletter source month scan ning light beam westward once again halt ing Las Vegas NV time illuminate Vegas Free fighter serves official publication VAMPS Vegas Antique Model Plane So ciety As its name suggests club OldTimer oriented its local flying activ ities take place one-by-four-mile hard clay surface Eldorado Dry Lake lo cated about 25 miles center Vegas Strip clubs alternate site 40 miles west larger area situated State Road 115 California/Nevada border near hotel casino having interesting name Whiskey Petes Sounds like grandiose spot celebrate winning flightsor drown sorrows over crashed model 168 Model Aviation Get ROUN TUfT Today ONLY Money Back GUARANTEE Business 0 0 &A Se2•& j5 s4 90 A5# O b:s &~ d 9tt PLENTY OF FREE PARKING 5 U~MONIUM TINO#4IUM NOinN SALTIMORE w t 411MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- lOam 4pm MARYLAND STATE FAIR GROUNDS TIMON KiM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301 -788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 clubs current officers Larry Lake president Frank Gable secretary/treasurer Phil MeCarey newsletter editor annual club dues $5 monthly meetings third Wednesday month offices URS Consultants Inc use back door very unusual statement made newsletter free nonmembers specific details may wish contact edi tor Phil McCarey 532 College Dr #212 Hen derson NV 89015 known whether have one-armed bandits club meeting room n side saddened hear spotlight going out Bill Bakers muchheralded Okie Flyer newsletter Bill claims burn out demise relatively short-lived one-man publication Oklahoma-based rag rated top attraction time thrived Good luck Billy What going nowtaming wild horses CG location once again Matzs Maxim Murphys Law states conclusion place get tired thinking think shall use cliche ex cuse having published infamous mislead ing formula finding approximate CG model offered February 1989 col umn missed article attempt aid not-so-learned Free Flighters locating approximate center-of-gravity CGor longitudinal balance pointof new model calculations using simplified formula However overzealous wee-hours-ofthe-morning rush complete article rea soning became muddled formula simply stated Sa x Tm CG Ca Sa being stab area Tm being tail mo ment measured point 25% back leading edge average wing chord width comparable point 25% stab chord Wa being area wing finally Ca being average chord wing Thus compu tations instead arriving initial CG point begin flight tests depending type model would net impractical number somehow left out part required com putations reality number can generate equation valuable discard called tail volume coefficient TV0 So formula should really have read Sa x Tm TV0 Ca find CG place seemingly meaningless TV0 number very simple computation TV0 CG 25 25 result should much realistic number CG new model Please note somewhat approxi mate location calculated point teeter-totter between stability stability As surely want hang hat such critical point have 50/50 chance between success disaster first flight need stir safety factor sure initial flights will immune adverse affects initial faulty CG loca tion Therefore since certainly wish favor stable side fulcrum should move starting CG least 5% probably closer 10% forward calculated CG neutral point contest Power models Towline Glid HI TECH GLASS EPPLER 214 134 WINGS TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINS HI PERFORMANCE SAILPLANES oltens high gaalh5 line ol l,lMlo 51$ OlllOlepoxies glass cloth kevia, laminates HP Call wing steeling color FOTO-PAAKSKOKu-FAN 3-vIewSskIn cacallin baggIng nlateels honeycomb beatiad loSing 50000 picures stock3000 drawings stocklasalages wings Contplele panel kits Caslom a0b Snochoe send 5100 SOSE o eampal kIt Sb 00 VIDEO TAPEVHS entie pp cog Wlht proce5s Includes ou vacuum bagging technique $2000 O Shipping Handling HI PERFORMANCE SAILPLANES 17002 NE 155th SI Woodloville WA55072 2011087-1721 NEWSPACESAVING F Itt box 2x7-3l8x 9-18 FUEL CONTAINER Tough Rigid Polyethylene udes cap ostage tubing ernere lock tubing through North Products PO Box 18419 Cleveland Heights OH 44118 I Galj June 1989 169 D- BEST Handcrafted Control Handle 1/2 Plywood Construction 270 lb test Aircraft Cable Stainless Steel Eyes Cable Loop ue 0 Shape Comfortable Grip ly transferred Instructor Student Pilot INTRODUCTORY PRICE BLUE SKY ENTERPRISES $95Rt2Box22BD Inelades ShippineSelma AL 36701 ers starting CG location competition Rubber models like 20% ahead computed CG Average chords wing stab found simply dividing areas spans novice Free Flighter utilization above two formulas plus moving starting CG ahead calculated result sug gested percentages average wing chord de pending type model involved should prevent first flight horror cases traceable mislocated CG As initially stated original ar ticle intended non-tech enthusiasts consider yourself category need read further regard topic However serious modeler might interested researching some following suggested material arrive own conclu sions First should like recognize Bill Bogart Bill McCombs Gil Morris flagging original misdemeanor suggesting past arti cles charts subject Second stated last time would clean up interesting chart publication chart supplied helpful Bill McCombsbut have since second thoughts second thoughts brought about some conflicting information between authors material personally researched wish col umn inadvertently become referee between respected individuals would like sim ply cite typical example said disagreement butt Out technical aspects proper CG location altogether instance refers definition tail moment Tm found three different interpretations depending article being studied Bill Bogart favors Tm distance tween LE leading edge wing quar ter chord 25% rearward LE stab Bill McCombs regards Tm distance between LEs wing stab author Jim OReilly designates Tm distance tween quarter chords both wing stab Chords instances mean average chords can visualize depending camp endorse final computations could vary slightly because using different points measurement reason incorpo rate 5%-20% safety margins after computa tions rate following references well worth investigating heretofore stated may wish draw own conclusions article served initial reference shows up page 88 Zaics 1959-61 Model Aeronautic Year Book article conden sation collaboration between Bill Bogart Bud Rhodes published January 1959 issue Model Airplane News Bill followed up in-depth study static stability 1980 NFFS Symposium cluded CG location world-class competi tion models well discussion contri bution dihedral stability Gil Morris acknowledged Bill Bogarts work subsequent 1984 NFFS Symposium offering simple computer program home computer use aid locating evasive CG types models Meanwhile stumbled across article Jim OReilly leaned primarily toward com petition rubber-powered category also referenced original Bogart/Rhodes work article found January/February 1983 issue NFFS Digest readily understandable should like avoid high tech talk Finally am indebted Bill McCombs efforts supplying various formulations charts wish relay suggestion terested parties may obtain copy Making Scale Model Airplanes Fly discusses CG problems pertain Rubber Scale other competition Rubber model designs well writing have personally sent copy may have too sending $995 plus $105 postage Aircraft Data Box 763576 Dal las TX 75224 conclusion wish thank wrote regard original articlethe critics well unknowing commented appreciated finally seeing something simple printed locating initial CG formal correspondence has answered cor rect information follow-up now clears conscience totally however AL Ponjee may have sent viable formula solving CG problem simple typewrit ten four-sentence notewhile appearing bit drasticmay have its place some instances Anyway Mr Ponjee says has CG Continued page ifl 170 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACH INE CUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $3495 ELECTRA L ITE-ICARUS-PANTERA- METEOR-ELECTRICUS-WHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries MI chargers need packagel Cycler-ChargecsmssCOi Fits 48V FIx 96V Tx packsPlus $5 S&Gelied Cell Others available write call TrickIer$3496Regular Model.. $4696 Radioselectric boat batteriesSpecIfy 612 24V MultiplePlus 83 S&HFor field kit sinaiPlus $3 SH Heavy Duty Model$5896 spool winch large boat andPlus $4 S&H electtoc power charging batteriesSpecify 6 1 2V ProductsSASEcrkVomiatoiPO Box 221 CaRa OealsrnqiMeslrivlid Canton SD 57013 F-mgDEDICATED TO PERFORMANCE SINCE 1959 BRICAN SYNCLJICAN CASTOR DDIT1V &CING GAS OVER 50 Hi-PERFORMANCE PRODUCTS FREE CATALOG 800-242-0489 Get STICKS. Fly RIGHT! 4 Primary Flight Training Program Videoc Teaches basic flight control safety Demonstrates training procedures flight lessons Explains frequency control field rules Utilizes Ground School Flight training Text Beginners Guide Radio Control Sport Flying Douglas R Pratt Tab Books Inc Includes information Academy Model Aeronautics STRUCTURE YOUR LEARNING PROCESS FROM PURCHASE TO LANDING AVOID PREMATURE CRASHES AND UNNECESSARY EXPENSES LEARN PROPER SAFETY AND CONTROL MAKE LEARNING TO FLY EASY VASTLY INCREASE YOUR CHANCES OF SUCCESS GREAT FOR CLUB INSTRUC TORS & HOBBY SHOP OWNERS,s - HEM ANY WAY w{o n]g~ BETTER PERFORMANCE NYROD THE ORIGINAL QtbQr PUSH ROD COMPLETE WITH ALL REQUIRED METAL ______________________________________ FITTINGS IDEALLY SUITED FOR ANY PUSH ROD ACTIONj RO\ RUDDERS ELEVATORS AILERONS THROTTLE sr CONTROL BOATS SEA PLANES. YOUR IMAGINATION 34 LONG ASSEMBLED LENGTH at NYROD SU-PR-LINE PROCUCTS INC 18800 State Route 47 E Sidney ONo 45365 PI 5134804721 HARDWARE INCLUDED 14 NYRODapter 18 Rod 2-56 Threaded end problem model simply drills out shall duck Out gig before make misteaks So See ya downwind USOC FF Scale/Warner Continued page 69 have luxury undamaged models after days flying Checking model carefully before flying can definitely help avoid repairs Find steam out wing warps Add little extra weight nose forward CG means greater stability Make sure nose block Rubber model snug going bounce around giving new thrust angle other second Tack glue things together can separate impact wing breaks two little tacked spots still OK thats solidly glued can take half cabin area goes Making wings plug Onto wires boxes better testing avoid windy conditions avoid fully wound Rubber motors have seen mi nor problems could have easily cor rected completely wipe out model due ex tra speed imparted full-power test Use smaller shorter longer rubber motors fewer winds tests engine-powered craft use propellers stalled backwards engines running very rich little rich may lean out scream extra air supply starts coming model tossed Some engines available throttles such G-Mark 035 can slowed down encountering rich/lean problem An engine cutoff timer will help cut ting off fuel flight almostbut quite old spiral dive doom kills models overlong engine runs because turn gets tighter tighter airspeed builds up repair try avoid doing things same way second time big Cleve land Stinson Reliant crash No Bill Say didnt happen RMcM broke wings inside rear spar made jog aileron broke right Id glued upgraded ad hesive repairing going slow-dry ep oxy also added bundles carbon-fiber thread around areas figured would break again smoothing epoxy over squeegee No further problems first crash located weak points added strength can add small wire hard wood pins hold joints together use doublers repair harder materials use cloth reinforce ment over weak areas add gussets etc Just dont put back way first time Once have plane flying well then should go through trouble making model look really super shock seeing fully finished super-detailed model go ultimate trauma hate repairs simple repairs can tolerated model shows promise repairs just bring back originallybecause have made model finished first place Famous goofs department t once forgot re move stuffer stick short inside Macchi C202 Rubber model certainly flew bit weird side Once modeler will notice has nose block upside down modeling clay ballast nose has fallen off very surprised look face often re 172 Model Aviation ci $2 Vt fn c TtiIlgo qIre ma/MI -505
Edition: Model Aviation - 1989/06
Page Numbers: 66, 67, 168, 169, 170, 172
5OOPoieci -T 425 _____171 L1 NFFS NEWS month June looms busy National Free Flight Society NFFS June 1-4 kickoff University Tennessee Minidome 116-ft ceiling John son City TN annual US Indoor Championships will 20 official events host unofficial ones well Area hotel dormitory facilities excellent Indoor buffs can send No 10 SASE USIC 1655 Re vere Dr Brookfield WI 53005 informa tive three-page contest packet begin plan vacations accordingly four days Indoor frolic followed first annual week-long NFFS/US Out door Championships June 19-23 Mid America Air Center near Lawrenceville IL Over 60 events card include facets Outdoor Free Flight competitionand like eat both SAM-type bean feed NFFS banquet works number motels both Lawrence ville neighboring Vincennes IN plenty low-cost dormitory space Vincennes University Get entry information early sending No 10 SASE ad dresses AMA Nostalgia Gas eventsA Italiano 1655 Revere Dr Brookfield WI 53005 Old-Timer events FF RCDon Sachtjen RR #5 Box 56B Bloomfield IN 47424 Flying Aces Clubs Flying Scale eventsLin Reichel 3301 Cindy Lane Erie PA 16506 number initial NFFS entry packets sent out before couple items emerged require clarification First contest flyer specifies Category II conditionswhich printing error impossibility Wind direction crop situations will obviously dictate actual competition flight rules probability proper assume Cate latest plan offering Al Lidberg 40-in-span Jumbo Rubber Scale Cessna Airmaster has knockoff wings Plastic 12-in prop available 66 Model Aviation Free plait Duration Harry Murphy 3824 Oakwood Blvd Anderson IN 4601 Zeek chronicles continue month Drawing shows minor differences between two old kit versions Photo has Bob Watson tuning OS Max 15-powered A/B Zeek prior official flight Fall 1988 contest Lawrenceville IL Its large-stab Premium version gory III conditions will exist Second important omission statement six NFFS-sponsored events will broken up Jr/Sr combined Open age categories events Gas Hand-Launched Glider Embryo Rubber P 30 Rubber Pee Wee 30 Peanut Scale Subse quent entry packets have corrected should have received initial distri bution should correct information accor dingly two back-to-back ventures 1989 examples new energy being exerted within NFFS promote Free Flight competi tion national level can show indi vidual support causes attending above affairs well joining/rejoining/re newing membership case may long-established organization Reaffirm support today sending yearly $15 mem bership fee NFFS 6146 E Cactus Wren Rd Scottsdale AZ 85253 Become bona fide Free Flight booster Bob Klipp directs NFFS Plan Service has advised NFFS listing available plans has now updated 1989 new listing includes 165 designs such noteworthy Power designs Jacksons Pilfered Pearl Verbitskys 1987 BE-48 FLC World Champion get yours send No 10 SASE NFFS Plans 10115 Newbold Dr St Louis MO 63137 Bob also offering full-size plans old fa vorite Satellite 1000 reduced price $5 postpaid first two dozen folks der gone price will re vert normal fee $850 NFFS mem bers $950 nonmembers plus 20% post age serious about obtaining plans either price can send full amount can return excess should order arrive before supply special price exhausted Pertinent potpourri version Vie Cunninghams venerable Geodetic Galaxie available once again Kits $2495 postpaid California residents add $162 tax Make checks payable Galaxie Model Co PO Box 4842 Covina CA 91723 original 585 Vies new Maxi scheduled avail able early 1989 well may wish enquire respect latter Should wish introduction uses space age composites model construction new 1989 MRL Model Research Labs catalog must scratch builder does catalog list new construction materi als accompanying pricings such items Kevlar various carbon fiber configurations alu minum wing skins etc became engrossed page after page in-depth descriptions dos/donts respect proper use various materials catalog just listing var ious high-tech materials offers invaluable formation suggesting appropriate uses composite catalog will dis card send $2 Model Research Labs 25108 Marguerite #160 Mission Viejo CA 92692 Youll receive education modern world composites USA FAI FF Team Manager Roger Simpson has raised SOS respect requesting aid form cash donations help outfit cur rent teams needed support equipment Inter ested individuals clubs can send contribu tions him 2625 Queenswood Dr Rancho Cordova CA 95670 funding goals achieved donate can expect team photo team decal return Okay senior citizens chance relive golden youth Peter Mann advises pos tal contest commemorate 50th anniversary Canadian Jimmy Allen Model Airplane originally kitted 1939 Ontario Model Aircraft Company Model Craft ronto currently being reproduced Easybuilt Models Beamsville Ontario can fly things off football field cant bug Out because lack flying site No excuses attributed bad timing will ac cepted either flights may logged anytime between March 1 September 30 1989 no entry fee also fits well within retirees fixed income Send #10 SASE Peter M Mann 36 Sydenham St Guelph Ontario Canada NiH 2W4 get details Al Lidberg offers 1989 version 10page plans catalog featuring latest addition 40-in-span Jumbo Scale Cessna Airmaster Plans exquisite done Al can tradition old days Comet Model Airplane Company catalog dollarbut its free requested send $6 check plan Four pages building structions three-views full-scale air craft also included address AA Lidberg 614 B Fordham Tempe AZ 85283 Tell him Duration sent Zeek chroniclesPart IV Bill Cranfords Premium Manufacturing Company undertook production large-stab A/B Zeek early Fifties enlisted tire less efforts Lew Mahieu getting project moving Revisions made original Air 0 design concept some being quite obvious others subtle ensuing Korean situation caused under standable metal shortage hardwood engine bearers included kit lieu neat black-painted steel mounts trade mark original Air-O kit offering course enlarged stab rudder changes Continued page 168 June 1989 67 Leo Sullivan did nice job 1AA Nostalgia Gas rendition Hal deBolts vintage Air foiler design Eye-catching color scheme dark green white Space Age materials find way model building constructions about John Voorhees built iAA Gas ship butcher shop meat platters Meredith Chamberlain test runs OS Max 19 Ron Warring-designed Crescendo Wright Field meet Dayton OH British designs becoming popular NosGas Modeling Accessories MASTER AIRSCREW5 Balsa Stripper Precision stripwood easy Balsa Strip per Strips up 1/2 wide 1/4 thick can cut quickly accurately sheet stock vernier wheel advances 1/32 precise adjust ment stripper uses std type 11 hobby blade $495 suggested retail Razor Master iseiew w 1j~lane Plane uses heavy-duty industrial blade held place two locating screws allowing cutting depth set very rigidly accurately Use rounding smoothing contours fuselages cowlings shaping edges thinning strips etc $495 sug gested retail Replacement blades available stock no MA2101 $149 pack 3 Line Filter fuel filter outstanding value has threaded two-part alum num body 100-mesh stainless screen removeable easy cleaning $119 suggested retail Direct Drive 05 Prop Adaptor all-aluminum prop adaptor designed 06 electric motors recommended use Master Airscrew 7x4 7x6 8x4 8x6 propellers $395 suggested retail See Hobby Dealer WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 3I111 1989 Unlbed La AUGUST 20 oStatic Display Fun Fly Swap Shop Air Show Team Competition Information Call 1312USk SHOW 30 Flying DISC V-STOL SUPERIOR Small Field 8- FUN FLY Aircraft STABLE PREDICTABLE 8-AGILE $43 plus piing TX Res add 7% soles fax VISA MIC Foam 8- LIte Ply Construction ELEVON Mixer Included 25- 40cid 3-35 lbs Accurate QUALITY Materials Boston Coupe/Saulsbury Continued page 165 section plastic window area original model rare birds say practically flew right off board As longer motors installed however small amount clay needed nose its first formal contest Boston Coupe took first place flight time 48 seconds stable flier despite its lack dihedral looks very appealing air outdoor flying would add n dihe dral per tip stability first flights used loop %2 rubber about twice length plane Build Boston Coupe let know does Im sure youll pleased results FF Duration/Murphy Continued page 67 intended improve stability de crease size single wheel improved models finished appearance Whereas fuse lage moments remained relatively unchanged fuselage profile itself simplified somewhat resulting little less vertical height difference between stab wing locations Both ver sions depicted glow-powered McCoy 19 up front Air-O kit plans also showed locations ignition coil batteries indicating some first models may have built uti lizing ignition engines power contrast famous Zeek wing came through transformation completely unscathed due convenience utilizing steel-rule rib dies obtained Air-O anything else accompanying drawing indi cates both comparable differences sim ilarities two vintage production kits Fullsize plans both versions A/B Zeek kits available number plan sources Although Lew Mahieu aided bringing itial 1AA Zeek kit hobby shop shelves under Premium Manufacturing Co banner per sonal involvement original Zeek design concept drawing close Premium Lew also involved producing small RTF ready-to-flyRAfcM model supplied Los Angeles Ex aminer newspaper Power K&B 035 glow MIN Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin Bonded Model Products Box 10998 Suite 543 Austin TX 78766 512 250-1420 engine famed newspaper presented youthful paper carriers awards three newspaper subscription starts signed up Lew K&B 1949-53 respon sible kit venture com pany noted its model engine production Lews famous A/B Kiwi design design intended matched new K&B 15 Green Head companys contribu tion fledgling FAL Power competition day Lews talents varied ef forts utilized K&B knowledge fuels engine repair drafting art work K&Bs monthly magazine ad vertisementsnot mention laurels brought upon himself company consistent contest wins K&B eventually sold its interests Kiwi Paul K Guillow Co reproduced original A/B-size kit offered /2A version own Whereas Lew eventually phased out model building active model competition shortly after mid-Fifties left mark history Free Flight man ac complishments Premiums initial Zeek kit offering first flat-bottomed-airfoil spinoffs original undercamber-airfoil Zeek concept Bill Cranford stated writer 1983 letter reason flat-bottomed rib configura tion utilized instance was new building steel-rule dies lot simpler make wing ribs flat bot tom attempting some critical contour Thus another era Zeek legend born accident design ver sions flat-bottomed-airfoil Zeeks Well get topic next meet pages another chapter Zeek story Newsletter spotlight zoom another Free Flight newsletter source month scan ning light beam westward once again halt ing Las Vegas NV time illuminate Vegas Free fighter serves official publication VAMPS Vegas Antique Model Plane So ciety As its name suggests club OldTimer oriented its local flying activ ities take place one-by-four-mile hard clay surface Eldorado Dry Lake lo cated about 25 miles center Vegas Strip clubs alternate site 40 miles west larger area situated State Road 115 California/Nevada border near hotel casino having interesting name Whiskey Petes Sounds like grandiose spot celebrate winning flightsor drown sorrows over crashed model 168 Model Aviation Get ROUN TUfT Today ONLY Money Back GUARANTEE Business 0 0 &A Se2•& j5 s4 90 A5# O b:s &~ d 9tt PLENTY OF FREE PARKING 5 U~MONIUM TINO#4IUM NOinN SALTIMORE w t 411MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- lOam 4pm MARYLAND STATE FAIR GROUNDS TIMON KiM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301 -788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 clubs current officers Larry Lake president Frank Gable secretary/treasurer Phil MeCarey newsletter editor annual club dues $5 monthly meetings third Wednesday month offices URS Consultants Inc use back door very unusual statement made newsletter free nonmembers specific details may wish contact edi tor Phil McCarey 532 College Dr #212 Hen derson NV 89015 known whether have one-armed bandits club meeting room n side saddened hear spotlight going out Bill Bakers muchheralded Okie Flyer newsletter Bill claims burn out demise relatively short-lived one-man publication Oklahoma-based rag rated top attraction time thrived Good luck Billy What going nowtaming wild horses CG location once again Matzs Maxim Murphys Law states conclusion place get tired thinking think shall use cliche ex cuse having published infamous mislead ing formula finding approximate CG model offered February 1989 col umn missed article attempt aid not-so-learned Free Flighters locating approximate center-of-gravity CGor longitudinal balance pointof new model calculations using simplified formula However overzealous wee-hours-ofthe-morning rush complete article rea soning became muddled formula simply stated Sa x Tm CG Ca Sa being stab area Tm being tail mo ment measured point 25% back leading edge average wing chord width comparable point 25% stab chord Wa being area wing finally Ca being average chord wing Thus compu tations instead arriving initial CG point begin flight tests depending type model would net impractical number somehow left out part required com putations reality number can generate equation valuable discard called tail volume coefficient TV0 So formula should really have read Sa x Tm TV0 Ca find CG place seemingly meaningless TV0 number very simple computation TV0 CG 25 25 result should much realistic number CG new model Please note somewhat approxi mate location calculated point teeter-totter between stability stability As surely want hang hat such critical point have 50/50 chance between success disaster first flight need stir safety factor sure initial flights will immune adverse affects initial faulty CG loca tion Therefore since certainly wish favor stable side fulcrum should move starting CG least 5% probably closer 10% forward calculated CG neutral point contest Power models Towline Glid HI TECH GLASS EPPLER 214 134 WINGS TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINS HI PERFORMANCE SAILPLANES oltens high gaalh5 line ol l,lMlo 51$ OlllOlepoxies glass cloth kevia, laminates HP Call wing steeling color FOTO-PAAKSKOKu-FAN 3-vIewSskIn cacallin baggIng nlateels honeycomb beatiad loSing 50000 picures stock3000 drawings stocklasalages wings Contplele panel kits Caslom a0b Snochoe send 5100 SOSE o eampal kIt Sb 00 VIDEO TAPEVHS entie pp cog Wlht proce5s Includes ou vacuum bagging technique $2000 O Shipping Handling HI PERFORMANCE SAILPLANES 17002 NE 155th SI Woodloville WA55072 2011087-1721 NEWSPACESAVING F Itt box 2x7-3l8x 9-18 FUEL CONTAINER Tough Rigid Polyethylene udes cap ostage tubing ernere lock tubing through North Products PO Box 18419 Cleveland Heights OH 44118 I Galj June 1989 169 D- BEST Handcrafted Control Handle 1/2 Plywood Construction 270 lb test Aircraft Cable Stainless Steel Eyes Cable Loop ue 0 Shape Comfortable Grip ly transferred Instructor Student Pilot INTRODUCTORY PRICE BLUE SKY ENTERPRISES $95Rt2Box22BD Inelades ShippineSelma AL 36701 ers starting CG location competition Rubber models like 20% ahead computed CG Average chords wing stab found simply dividing areas spans novice Free Flighter utilization above two formulas plus moving starting CG ahead calculated result sug gested percentages average wing chord de pending type model involved should prevent first flight horror cases traceable mislocated CG As initially stated original ar ticle intended non-tech enthusiasts consider yourself category need read further regard topic However serious modeler might interested researching some following suggested material arrive own conclu sions First should like recognize Bill Bogart Bill McCombs Gil Morris flagging original misdemeanor suggesting past arti cles charts subject Second stated last time would clean up interesting chart publication chart supplied helpful Bill McCombsbut have since second thoughts second thoughts brought about some conflicting information between authors material personally researched wish col umn inadvertently become referee between respected individuals would like sim ply cite typical example said disagreement butt Out technical aspects proper CG location altogether instance refers definition tail moment Tm found three different interpretations depending article being studied Bill Bogart favors Tm distance tween LE leading edge wing quar ter chord 25% rearward LE stab Bill McCombs regards Tm distance between LEs wing stab author Jim OReilly designates Tm distance tween quarter chords both wing stab Chords instances mean average chords can visualize depending camp endorse final computations could vary slightly because using different points measurement reason incorpo rate 5%-20% safety margins after computa tions rate following references well worth investigating heretofore stated may wish draw own conclusions article served initial reference shows up page 88 Zaics 1959-61 Model Aeronautic Year Book article conden sation collaboration between Bill Bogart Bud Rhodes published January 1959 issue Model Airplane News Bill followed up in-depth study static stability 1980 NFFS Symposium cluded CG location world-class competi tion models well discussion contri bution dihedral stability Gil Morris acknowledged Bill Bogarts work subsequent 1984 NFFS Symposium offering simple computer program home computer use aid locating evasive CG types models Meanwhile stumbled across article Jim OReilly leaned primarily toward com petition rubber-powered category also referenced original Bogart/Rhodes work article found January/February 1983 issue NFFS Digest readily understandable should like avoid high tech talk Finally am indebted Bill McCombs efforts supplying various formulations charts wish relay suggestion terested parties may obtain copy Making Scale Model Airplanes Fly discusses CG problems pertain Rubber Scale other competition Rubber model designs well writing have personally sent copy may have too sending $995 plus $105 postage Aircraft Data Box 763576 Dal las TX 75224 conclusion wish thank wrote regard original articlethe critics well unknowing commented appreciated finally seeing something simple printed locating initial CG formal correspondence has answered cor rect information follow-up now clears conscience totally however AL Ponjee may have sent viable formula solving CG problem simple typewrit ten four-sentence notewhile appearing bit drasticmay have its place some instances Anyway Mr Ponjee says has CG Continued page ifl 170 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACH INE CUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $3495 ELECTRA L ITE-ICARUS-PANTERA- METEOR-ELECTRICUS-WHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries MI chargers need packagel Cycler-ChargecsmssCOi Fits 48V FIx 96V Tx packsPlus $5 S&Gelied Cell Others available write call TrickIer$3496Regular Model.. $4696 Radioselectric boat batteriesSpecIfy 612 24V MultiplePlus 83 S&HFor field kit sinaiPlus $3 SH Heavy Duty Model$5896 spool winch large boat andPlus $4 S&H electtoc power charging batteriesSpecify 6 1 2V ProductsSASEcrkVomiatoiPO Box 221 CaRa OealsrnqiMeslrivlid Canton SD 57013 F-mgDEDICATED TO PERFORMANCE SINCE 1959 BRICAN SYNCLJICAN CASTOR DDIT1V &CING GAS OVER 50 Hi-PERFORMANCE PRODUCTS FREE CATALOG 800-242-0489 Get STICKS. Fly RIGHT! 4 Primary Flight Training Program Videoc Teaches basic flight control safety Demonstrates training procedures flight lessons Explains frequency control field rules Utilizes Ground School Flight training Text Beginners Guide Radio Control Sport Flying Douglas R Pratt Tab Books Inc Includes information Academy Model Aeronautics STRUCTURE YOUR LEARNING PROCESS FROM PURCHASE TO LANDING AVOID PREMATURE CRASHES AND UNNECESSARY EXPENSES LEARN PROPER SAFETY AND CONTROL MAKE LEARNING TO FLY EASY VASTLY INCREASE YOUR CHANCES OF SUCCESS GREAT FOR CLUB INSTRUC TORS & HOBBY SHOP OWNERS,s - HEM ANY WAY w{o n]g~ BETTER PERFORMANCE NYROD THE ORIGINAL QtbQr PUSH ROD COMPLETE WITH ALL REQUIRED METAL ______________________________________ FITTINGS IDEALLY SUITED FOR ANY PUSH ROD ACTIONj RO\ RUDDERS ELEVATORS AILERONS THROTTLE sr CONTROL BOATS SEA PLANES. YOUR IMAGINATION 34 LONG ASSEMBLED LENGTH at NYROD SU-PR-LINE PROCUCTS INC 18800 State Route 47 E Sidney ONo 45365 PI 5134804721 HARDWARE INCLUDED 14 NYRODapter 18 Rod 2-56 Threaded end problem model simply drills out shall duck Out gig before make misteaks So See ya downwind USOC FF Scale/Warner Continued page 69 have luxury undamaged models after days flying Checking model carefully before flying can definitely help avoid repairs Find steam out wing warps Add little extra weight nose forward CG means greater stability Make sure nose block Rubber model snug going bounce around giving new thrust angle other second Tack glue things together can separate impact wing breaks two little tacked spots still OK thats solidly glued can take half cabin area goes Making wings plug Onto wires boxes better testing avoid windy conditions avoid fully wound Rubber motors have seen mi nor problems could have easily cor rected completely wipe out model due ex tra speed imparted full-power test Use smaller shorter longer rubber motors fewer winds tests engine-powered craft use propellers stalled backwards engines running very rich little rich may lean out scream extra air supply starts coming model tossed Some engines available throttles such G-Mark 035 can slowed down encountering rich/lean problem An engine cutoff timer will help cut ting off fuel flight almostbut quite old spiral dive doom kills models overlong engine runs because turn gets tighter tighter airspeed builds up repair try avoid doing things same way second time big Cleve land Stinson Reliant crash No Bill Say didnt happen RMcM broke wings inside rear spar made jog aileron broke right Id glued upgraded ad hesive repairing going slow-dry ep oxy also added bundles carbon-fiber thread around areas figured would break again smoothing epoxy over squeegee No further problems first crash located weak points added strength can add small wire hard wood pins hold joints together use doublers repair harder materials use cloth reinforce ment over weak areas add gussets etc Just dont put back way first time Once have plane flying well then should go through trouble making model look really super shock seeing fully finished super-detailed model go ultimate trauma hate repairs simple repairs can tolerated model shows promise repairs just bring back originallybecause have made model finished first place Famous goofs department t once forgot re move stuffer stick short inside Macchi C202 Rubber model certainly flew bit weird side Once modeler will notice has nose block upside down modeling clay ballast nose has fallen off very surprised look face often re 172 Model Aviation ci $2 Vt fn c TtiIlgo qIre ma/MI -505
Edition: Model Aviation - 1989/06
Page Numbers: 66, 67, 168, 169, 170, 172
5OOPoieci -T 425 _____171 L1 NFFS NEWS month June looms busy National Free Flight Society NFFS June 1-4 kickoff University Tennessee Minidome 116-ft ceiling John son City TN annual US Indoor Championships will 20 official events host unofficial ones well Area hotel dormitory facilities excellent Indoor buffs can send No 10 SASE USIC 1655 Re vere Dr Brookfield WI 53005 informa tive three-page contest packet begin plan vacations accordingly four days Indoor frolic followed first annual week-long NFFS/US Out door Championships June 19-23 Mid America Air Center near Lawrenceville IL Over 60 events card include facets Outdoor Free Flight competitionand like eat both SAM-type bean feed NFFS banquet works number motels both Lawrence ville neighboring Vincennes IN plenty low-cost dormitory space Vincennes University Get entry information early sending No 10 SASE ad dresses AMA Nostalgia Gas eventsA Italiano 1655 Revere Dr Brookfield WI 53005 Old-Timer events FF RCDon Sachtjen RR #5 Box 56B Bloomfield IN 47424 Flying Aces Clubs Flying Scale eventsLin Reichel 3301 Cindy Lane Erie PA 16506 number initial NFFS entry packets sent out before couple items emerged require clarification First contest flyer specifies Category II conditionswhich printing error impossibility Wind direction crop situations will obviously dictate actual competition flight rules probability proper assume Cate latest plan offering Al Lidberg 40-in-span Jumbo Rubber Scale Cessna Airmaster has knockoff wings Plastic 12-in prop available 66 Model Aviation Free plait Duration Harry Murphy 3824 Oakwood Blvd Anderson IN 4601 Zeek chronicles continue month Drawing shows minor differences between two old kit versions Photo has Bob Watson tuning OS Max 15-powered A/B Zeek prior official flight Fall 1988 contest Lawrenceville IL Its large-stab Premium version gory III conditions will exist Second important omission statement six NFFS-sponsored events will broken up Jr/Sr combined Open age categories events Gas Hand-Launched Glider Embryo Rubber P 30 Rubber Pee Wee 30 Peanut Scale Subse quent entry packets have corrected should have received initial distri bution should correct information accor dingly two back-to-back ventures 1989 examples new energy being exerted within NFFS promote Free Flight competi tion national level can show indi vidual support causes attending above affairs well joining/rejoining/re newing membership case may long-established organization Reaffirm support today sending yearly $15 mem bership fee NFFS 6146 E Cactus Wren Rd Scottsdale AZ 85253 Become bona fide Free Flight booster Bob Klipp directs NFFS Plan Service has advised NFFS listing available plans has now updated 1989 new listing includes 165 designs such noteworthy Power designs Jacksons Pilfered Pearl Verbitskys 1987 BE-48 FLC World Champion get yours send No 10 SASE NFFS Plans 10115 Newbold Dr St Louis MO 63137 Bob also offering full-size plans old fa vorite Satellite 1000 reduced price $5 postpaid first two dozen folks der gone price will re vert normal fee $850 NFFS mem bers $950 nonmembers plus 20% post age serious about obtaining plans either price can send full amount can return excess should order arrive before supply special price exhausted Pertinent potpourri version Vie Cunninghams venerable Geodetic Galaxie available once again Kits $2495 postpaid California residents add $162 tax Make checks payable Galaxie Model Co PO Box 4842 Covina CA 91723 original 585 Vies new Maxi scheduled avail able early 1989 well may wish enquire respect latter Should wish introduction uses space age composites model construction new 1989 MRL Model Research Labs catalog must scratch builder does catalog list new construction materi als accompanying pricings such items Kevlar various carbon fiber configurations alu minum wing skins etc became engrossed page after page in-depth descriptions dos/donts respect proper use various materials catalog just listing var ious high-tech materials offers invaluable formation suggesting appropriate uses composite catalog will dis card send $2 Model Research Labs 25108 Marguerite #160 Mission Viejo CA 92692 Youll receive education modern world composites USA FAI FF Team Manager Roger Simpson has raised SOS respect requesting aid form cash donations help outfit cur rent teams needed support equipment Inter ested individuals clubs can send contribu tions him 2625 Queenswood Dr Rancho Cordova CA 95670 funding goals achieved donate can expect team photo team decal return Okay senior citizens chance relive golden youth Peter Mann advises pos tal contest commemorate 50th anniversary Canadian Jimmy Allen Model Airplane originally kitted 1939 Ontario Model Aircraft Company Model Craft ronto currently being reproduced Easybuilt Models Beamsville Ontario can fly things off football field cant bug Out because lack flying site No excuses attributed bad timing will ac cepted either flights may logged anytime between March 1 September 30 1989 no entry fee also fits well within retirees fixed income Send #10 SASE Peter M Mann 36 Sydenham St Guelph Ontario Canada NiH 2W4 get details Al Lidberg offers 1989 version 10page plans catalog featuring latest addition 40-in-span Jumbo Scale Cessna Airmaster Plans exquisite done Al can tradition old days Comet Model Airplane Company catalog dollarbut its free requested send $6 check plan Four pages building structions three-views full-scale air craft also included address AA Lidberg 614 B Fordham Tempe AZ 85283 Tell him Duration sent Zeek chroniclesPart IV Bill Cranfords Premium Manufacturing Company undertook production large-stab A/B Zeek early Fifties enlisted tire less efforts Lew Mahieu getting project moving Revisions made original Air 0 design concept some being quite obvious others subtle ensuing Korean situation caused under standable metal shortage hardwood engine bearers included kit lieu neat black-painted steel mounts trade mark original Air-O kit offering course enlarged stab rudder changes Continued page 168 June 1989 67 Leo Sullivan did nice job 1AA Nostalgia Gas rendition Hal deBolts vintage Air foiler design Eye-catching color scheme dark green white Space Age materials find way model building constructions about John Voorhees built iAA Gas ship butcher shop meat platters Meredith Chamberlain test runs OS Max 19 Ron Warring-designed Crescendo Wright Field meet Dayton OH British designs becoming popular NosGas Modeling Accessories MASTER AIRSCREW5 Balsa Stripper Precision stripwood easy Balsa Strip per Strips up 1/2 wide 1/4 thick can cut quickly accurately sheet stock vernier wheel advances 1/32 precise adjust ment stripper uses std type 11 hobby blade $495 suggested retail Razor Master iseiew w 1j~lane Plane uses heavy-duty industrial blade held place two locating screws allowing cutting depth set very rigidly accurately Use rounding smoothing contours fuselages cowlings shaping edges thinning strips etc $495 sug gested retail Replacement blades available stock no MA2101 $149 pack 3 Line Filter fuel filter outstanding value has threaded two-part alum num body 100-mesh stainless screen removeable easy cleaning $119 suggested retail Direct Drive 05 Prop Adaptor all-aluminum prop adaptor designed 06 electric motors recommended use Master Airscrew 7x4 7x6 8x4 8x6 propellers $395 suggested retail See Hobby Dealer WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 3I111 1989 Unlbed La AUGUST 20 oStatic Display Fun Fly Swap Shop Air Show Team Competition Information Call 1312USk SHOW 30 Flying DISC V-STOL SUPERIOR Small Field 8- FUN FLY Aircraft STABLE PREDICTABLE 8-AGILE $43 plus piing TX Res add 7% soles fax VISA MIC Foam 8- LIte Ply Construction ELEVON Mixer Included 25- 40cid 3-35 lbs Accurate QUALITY Materials Boston Coupe/Saulsbury Continued page 165 section plastic window area original model rare birds say practically flew right off board As longer motors installed however small amount clay needed nose its first formal contest Boston Coupe took first place flight time 48 seconds stable flier despite its lack dihedral looks very appealing air outdoor flying would add n dihe dral per tip stability first flights used loop %2 rubber about twice length plane Build Boston Coupe let know does Im sure youll pleased results FF Duration/Murphy Continued page 67 intended improve stability de crease size single wheel improved models finished appearance Whereas fuse lage moments remained relatively unchanged fuselage profile itself simplified somewhat resulting little less vertical height difference between stab wing locations Both ver sions depicted glow-powered McCoy 19 up front Air-O kit plans also showed locations ignition coil batteries indicating some first models may have built uti lizing ignition engines power contrast famous Zeek wing came through transformation completely unscathed due convenience utilizing steel-rule rib dies obtained Air-O anything else accompanying drawing indi cates both comparable differences sim ilarities two vintage production kits Fullsize plans both versions A/B Zeek kits available number plan sources Although Lew Mahieu aided bringing itial 1AA Zeek kit hobby shop shelves under Premium Manufacturing Co banner per sonal involvement original Zeek design concept drawing close Premium Lew also involved producing small RTF ready-to-flyRAfcM model supplied Los Angeles Ex aminer newspaper Power K&B 035 glow MIN Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin Bonded Model Products Box 10998 Suite 543 Austin TX 78766 512 250-1420 engine famed newspaper presented youthful paper carriers awards three newspaper subscription starts signed up Lew K&B 1949-53 respon sible kit venture com pany noted its model engine production Lews famous A/B Kiwi design design intended matched new K&B 15 Green Head companys contribu tion fledgling FAL Power competition day Lews talents varied ef forts utilized K&B knowledge fuels engine repair drafting art work K&Bs monthly magazine ad vertisementsnot mention laurels brought upon himself company consistent contest wins K&B eventually sold its interests Kiwi Paul K Guillow Co reproduced original A/B-size kit offered /2A version own Whereas Lew eventually phased out model building active model competition shortly after mid-Fifties left mark history Free Flight man ac complishments Premiums initial Zeek kit offering first flat-bottomed-airfoil spinoffs original undercamber-airfoil Zeek concept Bill Cranford stated writer 1983 letter reason flat-bottomed rib configura tion utilized instance was new building steel-rule dies lot simpler make wing ribs flat bot tom attempting some critical contour Thus another era Zeek legend born accident design ver sions flat-bottomed-airfoil Zeeks Well get topic next meet pages another chapter Zeek story Newsletter spotlight zoom another Free Flight newsletter source month scan ning light beam westward once again halt ing Las Vegas NV time illuminate Vegas Free fighter serves official publication VAMPS Vegas Antique Model Plane So ciety As its name suggests club OldTimer oriented its local flying activ ities take place one-by-four-mile hard clay surface Eldorado Dry Lake lo cated about 25 miles center Vegas Strip clubs alternate site 40 miles west larger area situated State Road 115 California/Nevada border near hotel casino having interesting name Whiskey Petes Sounds like grandiose spot celebrate winning flightsor drown sorrows over crashed model 168 Model Aviation Get ROUN TUfT Today ONLY Money Back GUARANTEE Business 0 0 &A Se2•& j5 s4 90 A5# O b:s &~ d 9tt PLENTY OF FREE PARKING 5 U~MONIUM TINO#4IUM NOinN SALTIMORE w t 411MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- lOam 4pm MARYLAND STATE FAIR GROUNDS TIMON KiM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301 -788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 clubs current officers Larry Lake president Frank Gable secretary/treasurer Phil MeCarey newsletter editor annual club dues $5 monthly meetings third Wednesday month offices URS Consultants Inc use back door very unusual statement made newsletter free nonmembers specific details may wish contact edi tor Phil McCarey 532 College Dr #212 Hen derson NV 89015 known whether have one-armed bandits club meeting room n side saddened hear spotlight going out Bill Bakers muchheralded Okie Flyer newsletter Bill claims burn out demise relatively short-lived one-man publication Oklahoma-based rag rated top attraction time thrived Good luck Billy What going nowtaming wild horses CG location once again Matzs Maxim Murphys Law states conclusion place get tired thinking think shall use cliche ex cuse having published infamous mislead ing formula finding approximate CG model offered February 1989 col umn missed article attempt aid not-so-learned Free Flighters locating approximate center-of-gravity CGor longitudinal balance pointof new model calculations using simplified formula However overzealous wee-hours-ofthe-morning rush complete article rea soning became muddled formula simply stated Sa x Tm CG Ca Sa being stab area Tm being tail mo ment measured point 25% back leading edge average wing chord width comparable point 25% stab chord Wa being area wing finally Ca being average chord wing Thus compu tations instead arriving initial CG point begin flight tests depending type model would net impractical number somehow left out part required com putations reality number can generate equation valuable discard called tail volume coefficient TV0 So formula should really have read Sa x Tm TV0 Ca find CG place seemingly meaningless TV0 number very simple computation TV0 CG 25 25 result should much realistic number CG new model Please note somewhat approxi mate location calculated point teeter-totter between stability stability As surely want hang hat such critical point have 50/50 chance between success disaster first flight need stir safety factor sure initial flights will immune adverse affects initial faulty CG loca tion Therefore since certainly wish favor stable side fulcrum should move starting CG least 5% probably closer 10% forward calculated CG neutral point contest Power models Towline Glid HI TECH GLASS EPPLER 214 134 WINGS TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINS HI PERFORMANCE SAILPLANES oltens high gaalh5 line ol l,lMlo 51$ OlllOlepoxies glass cloth kevia, laminates HP Call wing steeling color FOTO-PAAKSKOKu-FAN 3-vIewSskIn cacallin baggIng nlateels honeycomb beatiad loSing 50000 picures stock3000 drawings stocklasalages wings Contplele panel kits Caslom a0b Snochoe send 5100 SOSE o eampal kIt Sb 00 VIDEO TAPEVHS entie pp cog Wlht proce5s Includes ou vacuum bagging technique $2000 O Shipping Handling HI PERFORMANCE SAILPLANES 17002 NE 155th SI Woodloville WA55072 2011087-1721 NEWSPACESAVING F Itt box 2x7-3l8x 9-18 FUEL CONTAINER Tough Rigid Polyethylene udes cap ostage tubing ernere lock tubing through North Products PO Box 18419 Cleveland Heights OH 44118 I Galj June 1989 169 D- BEST Handcrafted Control Handle 1/2 Plywood Construction 270 lb test Aircraft Cable Stainless Steel Eyes Cable Loop ue 0 Shape Comfortable Grip ly transferred Instructor Student Pilot INTRODUCTORY PRICE BLUE SKY ENTERPRISES $95Rt2Box22BD Inelades ShippineSelma AL 36701 ers starting CG location competition Rubber models like 20% ahead computed CG Average chords wing stab found simply dividing areas spans novice Free Flighter utilization above two formulas plus moving starting CG ahead calculated result sug gested percentages average wing chord de pending type model involved should prevent first flight horror cases traceable mislocated CG As initially stated original ar ticle intended non-tech enthusiasts consider yourself category need read further regard topic However serious modeler might interested researching some following suggested material arrive own conclu sions First should like recognize Bill Bogart Bill McCombs Gil Morris flagging original misdemeanor suggesting past arti cles charts subject Second stated last time would clean up interesting chart publication chart supplied helpful Bill McCombsbut have since second thoughts second thoughts brought about some conflicting information between authors material personally researched wish col umn inadvertently become referee between respected individuals would like sim ply cite typical example said disagreement butt Out technical aspects proper CG location altogether instance refers definition tail moment Tm found three different interpretations depending article being studied Bill Bogart favors Tm distance tween LE leading edge wing quar ter chord 25% rearward LE stab Bill McCombs regards Tm distance between LEs wing stab author Jim OReilly designates Tm distance tween quarter chords both wing stab Chords instances mean average chords can visualize depending camp endorse final computations could vary slightly because using different points measurement reason incorpo rate 5%-20% safety margins after computa tions rate following references well worth investigating heretofore stated may wish draw own conclusions article served initial reference shows up page 88 Zaics 1959-61 Model Aeronautic Year Book article conden sation collaboration between Bill Bogart Bud Rhodes published January 1959 issue Model Airplane News Bill followed up in-depth study static stability 1980 NFFS Symposium cluded CG location world-class competi tion models well discussion contri bution dihedral stability Gil Morris acknowledged Bill Bogarts work subsequent 1984 NFFS Symposium offering simple computer program home computer use aid locating evasive CG types models Meanwhile stumbled across article Jim OReilly leaned primarily toward com petition rubber-powered category also referenced original Bogart/Rhodes work article found January/February 1983 issue NFFS Digest readily understandable should like avoid high tech talk Finally am indebted Bill McCombs efforts supplying various formulations charts wish relay suggestion terested parties may obtain copy Making Scale Model Airplanes Fly discusses CG problems pertain Rubber Scale other competition Rubber model designs well writing have personally sent copy may have too sending $995 plus $105 postage Aircraft Data Box 763576 Dal las TX 75224 conclusion wish thank wrote regard original articlethe critics well unknowing commented appreciated finally seeing something simple printed locating initial CG formal correspondence has answered cor rect information follow-up now clears conscience totally however AL Ponjee may have sent viable formula solving CG problem simple typewrit ten four-sentence notewhile appearing bit drasticmay have its place some instances Anyway Mr Ponjee says has CG Continued page ifl 170 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACH INE CUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $3495 ELECTRA L ITE-ICARUS-PANTERA- METEOR-ELECTRICUS-WHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries MI chargers need packagel Cycler-ChargecsmssCOi Fits 48V FIx 96V Tx packsPlus $5 S&Gelied Cell Others available write call TrickIer$3496Regular Model.. $4696 Radioselectric boat batteriesSpecIfy 612 24V MultiplePlus 83 S&HFor field kit sinaiPlus $3 SH Heavy Duty Model$5896 spool winch large boat andPlus $4 S&H electtoc power charging batteriesSpecify 6 1 2V ProductsSASEcrkVomiatoiPO Box 221 CaRa OealsrnqiMeslrivlid Canton SD 57013 F-mgDEDICATED TO PERFORMANCE SINCE 1959 BRICAN SYNCLJICAN CASTOR DDIT1V &CING GAS OVER 50 Hi-PERFORMANCE PRODUCTS FREE CATALOG 800-242-0489 Get STICKS. Fly RIGHT! 4 Primary Flight Training Program Videoc Teaches basic flight control safety Demonstrates training procedures flight lessons Explains frequency control field rules Utilizes Ground School Flight training Text Beginners Guide Radio Control Sport Flying Douglas R Pratt Tab Books Inc Includes information Academy Model Aeronautics STRUCTURE YOUR LEARNING PROCESS FROM PURCHASE TO LANDING AVOID PREMATURE CRASHES AND UNNECESSARY EXPENSES LEARN PROPER SAFETY AND CONTROL MAKE LEARNING TO FLY EASY VASTLY INCREASE YOUR CHANCES OF SUCCESS GREAT FOR CLUB INSTRUC TORS & HOBBY SHOP OWNERS,s - HEM ANY WAY w{o n]g~ BETTER PERFORMANCE NYROD THE ORIGINAL QtbQr PUSH ROD COMPLETE WITH ALL REQUIRED METAL ______________________________________ FITTINGS IDEALLY SUITED FOR ANY PUSH ROD ACTIONj RO\ RUDDERS ELEVATORS AILERONS THROTTLE sr CONTROL BOATS SEA PLANES. YOUR IMAGINATION 34 LONG ASSEMBLED LENGTH at NYROD SU-PR-LINE PROCUCTS INC 18800 State Route 47 E Sidney ONo 45365 PI 5134804721 HARDWARE INCLUDED 14 NYRODapter 18 Rod 2-56 Threaded end problem model simply drills out shall duck Out gig before make misteaks So See ya downwind USOC FF Scale/Warner Continued page 69 have luxury undamaged models after days flying Checking model carefully before flying can definitely help avoid repairs Find steam out wing warps Add little extra weight nose forward CG means greater stability Make sure nose block Rubber model snug going bounce around giving new thrust angle other second Tack glue things together can separate impact wing breaks two little tacked spots still OK thats solidly glued can take half cabin area goes Making wings plug Onto wires boxes better testing avoid windy conditions avoid fully wound Rubber motors have seen mi nor problems could have easily cor rected completely wipe out model due ex tra speed imparted full-power test Use smaller shorter longer rubber motors fewer winds tests engine-powered craft use propellers stalled backwards engines running very rich little rich may lean out scream extra air supply starts coming model tossed Some engines available throttles such G-Mark 035 can slowed down encountering rich/lean problem An engine cutoff timer will help cut ting off fuel flight almostbut quite old spiral dive doom kills models overlong engine runs because turn gets tighter tighter airspeed builds up repair try avoid doing things same way second time big Cleve land Stinson Reliant crash No Bill Say didnt happen RMcM broke wings inside rear spar made jog aileron broke right Id glued upgraded ad hesive repairing going slow-dry ep oxy also added bundles carbon-fiber thread around areas figured would break again smoothing epoxy over squeegee No further problems first crash located weak points added strength can add small wire hard wood pins hold joints together use doublers repair harder materials use cloth reinforce ment over weak areas add gussets etc Just dont put back way first time Once have plane flying well then should go through trouble making model look really super shock seeing fully finished super-detailed model go ultimate trauma hate repairs simple repairs can tolerated model shows promise repairs just bring back originallybecause have made model finished first place Famous goofs department t once forgot re move stuffer stick short inside Macchi C202 Rubber model certainly flew bit weird side Once modeler will notice has nose block upside down modeling clay ballast nose has fallen off very surprised look face often re 172 Model Aviation ci $2 Vt fn c TtiIlgo qIre ma/MI -505
Edition: Model Aviation - 1989/06
Page Numbers: 66, 67, 168, 169, 170, 172
5OOPoieci -T 425 _____171 L1 NFFS NEWS month June looms busy National Free Flight Society NFFS June 1-4 kickoff University Tennessee Minidome 116-ft ceiling John son City TN annual US Indoor Championships will 20 official events host unofficial ones well Area hotel dormitory facilities excellent Indoor buffs can send No 10 SASE USIC 1655 Re vere Dr Brookfield WI 53005 informa tive three-page contest packet begin plan vacations accordingly four days Indoor frolic followed first annual week-long NFFS/US Out door Championships June 19-23 Mid America Air Center near Lawrenceville IL Over 60 events card include facets Outdoor Free Flight competitionand like eat both SAM-type bean feed NFFS banquet works number motels both Lawrence ville neighboring Vincennes IN plenty low-cost dormitory space Vincennes University Get entry information early sending No 10 SASE ad dresses AMA Nostalgia Gas eventsA Italiano 1655 Revere Dr Brookfield WI 53005 Old-Timer events FF RCDon Sachtjen RR #5 Box 56B Bloomfield IN 47424 Flying Aces Clubs Flying Scale eventsLin Reichel 3301 Cindy Lane Erie PA 16506 number initial NFFS entry packets sent out before couple items emerged require clarification First contest flyer specifies Category II conditionswhich printing error impossibility Wind direction crop situations will obviously dictate actual competition flight rules probability proper assume Cate latest plan offering Al Lidberg 40-in-span Jumbo Rubber Scale Cessna Airmaster has knockoff wings Plastic 12-in prop available 66 Model Aviation Free plait Duration Harry Murphy 3824 Oakwood Blvd Anderson IN 4601 Zeek chronicles continue month Drawing shows minor differences between two old kit versions Photo has Bob Watson tuning OS Max 15-powered A/B Zeek prior official flight Fall 1988 contest Lawrenceville IL Its large-stab Premium version gory III conditions will exist Second important omission statement six NFFS-sponsored events will broken up Jr/Sr combined Open age categories events Gas Hand-Launched Glider Embryo Rubber P 30 Rubber Pee Wee 30 Peanut Scale Subse quent entry packets have corrected should have received initial distri bution should correct information accor dingly two back-to-back ventures 1989 examples new energy being exerted within NFFS promote Free Flight competi tion national level can show indi vidual support causes attending above affairs well joining/rejoining/re newing membership case may long-established organization Reaffirm support today sending yearly $15 mem bership fee NFFS 6146 E Cactus Wren Rd Scottsdale AZ 85253 Become bona fide Free Flight booster Bob Klipp directs NFFS Plan Service has advised NFFS listing available plans has now updated 1989 new listing includes 165 designs such noteworthy Power designs Jacksons Pilfered Pearl Verbitskys 1987 BE-48 FLC World Champion get yours send No 10 SASE NFFS Plans 10115 Newbold Dr St Louis MO 63137 Bob also offering full-size plans old fa vorite Satellite 1000 reduced price $5 postpaid first two dozen folks der gone price will re vert normal fee $850 NFFS mem bers $950 nonmembers plus 20% post age serious about obtaining plans either price can send full amount can return excess should order arrive before supply special price exhausted Pertinent potpourri version Vie Cunninghams venerable Geodetic Galaxie available once again Kits $2495 postpaid California residents add $162 tax Make checks payable Galaxie Model Co PO Box 4842 Covina CA 91723 original 585 Vies new Maxi scheduled avail able early 1989 well may wish enquire respect latter Should wish introduction uses space age composites model construction new 1989 MRL Model Research Labs catalog must scratch builder does catalog list new construction materi als accompanying pricings such items Kevlar various carbon fiber configurations alu minum wing skins etc became engrossed page after page in-depth descriptions dos/donts respect proper use various materials catalog just listing var ious high-tech materials offers invaluable formation suggesting appropriate uses composite catalog will dis card send $2 Model Research Labs 25108 Marguerite #160 Mission Viejo CA 92692 Youll receive education modern world composites USA FAI FF Team Manager Roger Simpson has raised SOS respect requesting aid form cash donations help outfit cur rent teams needed support equipment Inter ested individuals clubs can send contribu tions him 2625 Queenswood Dr Rancho Cordova CA 95670 funding goals achieved donate can expect team photo team decal return Okay senior citizens chance relive golden youth Peter Mann advises pos tal contest commemorate 50th anniversary Canadian Jimmy Allen Model Airplane originally kitted 1939 Ontario Model Aircraft Company Model Craft ronto currently being reproduced Easybuilt Models Beamsville Ontario can fly things off football field cant bug Out because lack flying site No excuses attributed bad timing will ac cepted either flights may logged anytime between March 1 September 30 1989 no entry fee also fits well within retirees fixed income Send #10 SASE Peter M Mann 36 Sydenham St Guelph Ontario Canada NiH 2W4 get details Al Lidberg offers 1989 version 10page plans catalog featuring latest addition 40-in-span Jumbo Scale Cessna Airmaster Plans exquisite done Al can tradition old days Comet Model Airplane Company catalog dollarbut its free requested send $6 check plan Four pages building structions three-views full-scale air craft also included address AA Lidberg 614 B Fordham Tempe AZ 85283 Tell him Duration sent Zeek chroniclesPart IV Bill Cranfords Premium Manufacturing Company undertook production large-stab A/B Zeek early Fifties enlisted tire less efforts Lew Mahieu getting project moving Revisions made original Air 0 design concept some being quite obvious others subtle ensuing Korean situation caused under standable metal shortage hardwood engine bearers included kit lieu neat black-painted steel mounts trade mark original Air-O kit offering course enlarged stab rudder changes Continued page 168 June 1989 67 Leo Sullivan did nice job 1AA Nostalgia Gas rendition Hal deBolts vintage Air foiler design Eye-catching color scheme dark green white Space Age materials find way model building constructions about John Voorhees built iAA Gas ship butcher shop meat platters Meredith Chamberlain test runs OS Max 19 Ron Warring-designed Crescendo Wright Field meet Dayton OH British designs becoming popular NosGas Modeling Accessories MASTER AIRSCREW5 Balsa Stripper Precision stripwood easy Balsa Strip per Strips up 1/2 wide 1/4 thick can cut quickly accurately sheet stock vernier wheel advances 1/32 precise adjust ment stripper uses std type 11 hobby blade $495 suggested retail Razor Master iseiew w 1j~lane Plane uses heavy-duty industrial blade held place two locating screws allowing cutting depth set very rigidly accurately Use rounding smoothing contours fuselages cowlings shaping edges thinning strips etc $495 sug gested retail Replacement blades available stock no MA2101 $149 pack 3 Line Filter fuel filter outstanding value has threaded two-part alum num body 100-mesh stainless screen removeable easy cleaning $119 suggested retail Direct Drive 05 Prop Adaptor all-aluminum prop adaptor designed 06 electric motors recommended use Master Airscrew 7x4 7x6 8x4 8x6 propellers $395 suggested retail See Hobby Dealer WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 3I111 1989 Unlbed La AUGUST 20 oStatic Display Fun Fly Swap Shop Air Show Team Competition Information Call 1312USk SHOW 30 Flying DISC V-STOL SUPERIOR Small Field 8- FUN FLY Aircraft STABLE PREDICTABLE 8-AGILE $43 plus piing TX Res add 7% soles fax VISA MIC Foam 8- LIte Ply Construction ELEVON Mixer Included 25- 40cid 3-35 lbs Accurate QUALITY Materials Boston Coupe/Saulsbury Continued page 165 section plastic window area original model rare birds say practically flew right off board As longer motors installed however small amount clay needed nose its first formal contest Boston Coupe took first place flight time 48 seconds stable flier despite its lack dihedral looks very appealing air outdoor flying would add n dihe dral per tip stability first flights used loop %2 rubber about twice length plane Build Boston Coupe let know does Im sure youll pleased results FF Duration/Murphy Continued page 67 intended improve stability de crease size single wheel improved models finished appearance Whereas fuse lage moments remained relatively unchanged fuselage profile itself simplified somewhat resulting little less vertical height difference between stab wing locations Both ver sions depicted glow-powered McCoy 19 up front Air-O kit plans also showed locations ignition coil batteries indicating some first models may have built uti lizing ignition engines power contrast famous Zeek wing came through transformation completely unscathed due convenience utilizing steel-rule rib dies obtained Air-O anything else accompanying drawing indi cates both comparable differences sim ilarities two vintage production kits Fullsize plans both versions A/B Zeek kits available number plan sources Although Lew Mahieu aided bringing itial 1AA Zeek kit hobby shop shelves under Premium Manufacturing Co banner per sonal involvement original Zeek design concept drawing close Premium Lew also involved producing small RTF ready-to-flyRAfcM model supplied Los Angeles Ex aminer newspaper Power K&B 035 glow MIN Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin Bonded Model Products Box 10998 Suite 543 Austin TX 78766 512 250-1420 engine famed newspaper presented youthful paper carriers awards three newspaper subscription starts signed up Lew K&B 1949-53 respon sible kit venture com pany noted its model engine production Lews famous A/B Kiwi design design intended matched new K&B 15 Green Head companys contribu tion fledgling FAL Power competition day Lews talents varied ef forts utilized K&B knowledge fuels engine repair drafting art work K&Bs monthly magazine ad vertisementsnot mention laurels brought upon himself company consistent contest wins K&B eventually sold its interests Kiwi Paul K Guillow Co reproduced original A/B-size kit offered /2A version own Whereas Lew eventually phased out model building active model competition shortly after mid-Fifties left mark history Free Flight man ac complishments Premiums initial Zeek kit offering first flat-bottomed-airfoil spinoffs original undercamber-airfoil Zeek concept Bill Cranford stated writer 1983 letter reason flat-bottomed rib configura tion utilized instance was new building steel-rule dies lot simpler make wing ribs flat bot tom attempting some critical contour Thus another era Zeek legend born accident design ver sions flat-bottomed-airfoil Zeeks Well get topic next meet pages another chapter Zeek story Newsletter spotlight zoom another Free Flight newsletter source month scan ning light beam westward once again halt ing Las Vegas NV time illuminate Vegas Free fighter serves official publication VAMPS Vegas Antique Model Plane So ciety As its name suggests club OldTimer oriented its local flying activ ities take place one-by-four-mile hard clay surface Eldorado Dry Lake lo cated about 25 miles center Vegas Strip clubs alternate site 40 miles west larger area situated State Road 115 California/Nevada border near hotel casino having interesting name Whiskey Petes Sounds like grandiose spot celebrate winning flightsor drown sorrows over crashed model 168 Model Aviation Get ROUN TUfT Today ONLY Money Back GUARANTEE Business 0 0 &A Se2•& j5 s4 90 A5# O b:s &~ d 9tt PLENTY OF FREE PARKING 5 U~MONIUM TINO#4IUM NOinN SALTIMORE w t 411MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- lOam 4pm MARYLAND STATE FAIR GROUNDS TIMON KiM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301 -788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 clubs current officers Larry Lake president Frank Gable secretary/treasurer Phil MeCarey newsletter editor annual club dues $5 monthly meetings third Wednesday month offices URS Consultants Inc use back door very unusual statement made newsletter free nonmembers specific details may wish contact edi tor Phil McCarey 532 College Dr #212 Hen derson NV 89015 known whether have one-armed bandits club meeting room n side saddened hear spotlight going out Bill Bakers muchheralded Okie Flyer newsletter Bill claims burn out demise relatively short-lived one-man publication Oklahoma-based rag rated top attraction time thrived Good luck Billy What going nowtaming wild horses CG location once again Matzs Maxim Murphys Law states conclusion place get tired thinking think shall use cliche ex cuse having published infamous mislead ing formula finding approximate CG model offered February 1989 col umn missed article attempt aid not-so-learned Free Flighters locating approximate center-of-gravity CGor longitudinal balance pointof new model calculations using simplified formula However overzealous wee-hours-ofthe-morning rush complete article rea soning became muddled formula simply stated Sa x Tm CG Ca Sa being stab area Tm being tail mo ment measured point 25% back leading edge average wing chord width comparable point 25% stab chord Wa being area wing finally Ca being average chord wing Thus compu tations instead arriving initial CG point begin flight tests depending type model would net impractical number somehow left out part required com putations reality number can generate equation valuable discard called tail volume coefficient TV0 So formula should really have read Sa x Tm TV0 Ca find CG place seemingly meaningless TV0 number very simple computation TV0 CG 25 25 result should much realistic number CG new model Please note somewhat approxi mate location calculated point teeter-totter between stability stability As surely want hang hat such critical point have 50/50 chance between success disaster first flight need stir safety factor sure initial flights will immune adverse affects initial faulty CG loca tion Therefore since certainly wish favor stable side fulcrum should move starting CG least 5% probably closer 10% forward calculated CG neutral point contest Power models Towline Glid HI TECH GLASS EPPLER 214 134 WINGS TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINS HI PERFORMANCE SAILPLANES oltens high gaalh5 line ol l,lMlo 51$ OlllOlepoxies glass cloth kevia, laminates HP Call wing steeling color FOTO-PAAKSKOKu-FAN 3-vIewSskIn cacallin baggIng nlateels honeycomb beatiad loSing 50000 picures stock3000 drawings stocklasalages wings Contplele panel kits Caslom a0b Snochoe send 5100 SOSE o eampal kIt Sb 00 VIDEO TAPEVHS entie pp cog Wlht proce5s Includes ou vacuum bagging technique $2000 O Shipping Handling HI PERFORMANCE SAILPLANES 17002 NE 155th SI Woodloville WA55072 2011087-1721 NEWSPACESAVING F Itt box 2x7-3l8x 9-18 FUEL CONTAINER Tough Rigid Polyethylene udes cap ostage tubing ernere lock tubing through North Products PO Box 18419 Cleveland Heights OH 44118 I Galj June 1989 169 D- BEST Handcrafted Control Handle 1/2 Plywood Construction 270 lb test Aircraft Cable Stainless Steel Eyes Cable Loop ue 0 Shape Comfortable Grip ly transferred Instructor Student Pilot INTRODUCTORY PRICE BLUE SKY ENTERPRISES $95Rt2Box22BD Inelades ShippineSelma AL 36701 ers starting CG location competition Rubber models like 20% ahead computed CG Average chords wing stab found simply dividing areas spans novice Free Flighter utilization above two formulas plus moving starting CG ahead calculated result sug gested percentages average wing chord de pending type model involved should prevent first flight horror cases traceable mislocated CG As initially stated original ar ticle intended non-tech enthusiasts consider yourself category need read further regard topic However serious modeler might interested researching some following suggested material arrive own conclu sions First should like recognize Bill Bogart Bill McCombs Gil Morris flagging original misdemeanor suggesting past arti cles charts subject Second stated last time would clean up interesting chart publication chart supplied helpful Bill McCombsbut have since second thoughts second thoughts brought about some conflicting information between authors material personally researched wish col umn inadvertently become referee between respected individuals would like sim ply cite typical example said disagreement butt Out technical aspects proper CG location altogether instance refers definition tail moment Tm found three different interpretations depending article being studied Bill Bogart favors Tm distance tween LE leading edge wing quar ter chord 25% rearward LE stab Bill McCombs regards Tm distance between LEs wing stab author Jim OReilly designates Tm distance tween quarter chords both wing stab Chords instances mean average chords can visualize depending camp endorse final computations could vary slightly because using different points measurement reason incorpo rate 5%-20% safety margins after computa tions rate following references well worth investigating heretofore stated may wish draw own conclusions article served initial reference shows up page 88 Zaics 1959-61 Model Aeronautic Year Book article conden sation collaboration between Bill Bogart Bud Rhodes published January 1959 issue Model Airplane News Bill followed up in-depth study static stability 1980 NFFS Symposium cluded CG location world-class competi tion models well discussion contri bution dihedral stability Gil Morris acknowledged Bill Bogarts work subsequent 1984 NFFS Symposium offering simple computer program home computer use aid locating evasive CG types models Meanwhile stumbled across article Jim OReilly leaned primarily toward com petition rubber-powered category also referenced original Bogart/Rhodes work article found January/February 1983 issue NFFS Digest readily understandable should like avoid high tech talk Finally am indebted Bill McCombs efforts supplying various formulations charts wish relay suggestion terested parties may obtain copy Making Scale Model Airplanes Fly discusses CG problems pertain Rubber Scale other competition Rubber model designs well writing have personally sent copy may have too sending $995 plus $105 postage Aircraft Data Box 763576 Dal las TX 75224 conclusion wish thank wrote regard original articlethe critics well unknowing commented appreciated finally seeing something simple printed locating initial CG formal correspondence has answered cor rect information follow-up now clears conscience totally however AL Ponjee may have sent viable formula solving CG problem simple typewrit ten four-sentence notewhile appearing bit drasticmay have its place some instances Anyway Mr Ponjee says has CG Continued page ifl 170 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACH INE CUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $3495 ELECTRA L ITE-ICARUS-PANTERA- METEOR-ELECTRICUS-WHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries MI chargers need packagel Cycler-ChargecsmssCOi Fits 48V FIx 96V Tx packsPlus $5 S&Gelied Cell Others available write call TrickIer$3496Regular Model.. $4696 Radioselectric boat batteriesSpecIfy 612 24V MultiplePlus 83 S&HFor field kit sinaiPlus $3 SH Heavy Duty Model$5896 spool winch large boat andPlus $4 S&H electtoc power charging batteriesSpecify 6 1 2V ProductsSASEcrkVomiatoiPO Box 221 CaRa OealsrnqiMeslrivlid Canton SD 57013 F-mgDEDICATED TO PERFORMANCE SINCE 1959 BRICAN SYNCLJICAN CASTOR DDIT1V &CING GAS OVER 50 Hi-PERFORMANCE PRODUCTS FREE CATALOG 800-242-0489 Get STICKS. Fly RIGHT! 4 Primary Flight Training Program Videoc Teaches basic flight control safety Demonstrates training procedures flight lessons Explains frequency control field rules Utilizes Ground School Flight training Text Beginners Guide Radio Control Sport Flying Douglas R Pratt Tab Books Inc Includes information Academy Model Aeronautics STRUCTURE YOUR LEARNING PROCESS FROM PURCHASE TO LANDING AVOID PREMATURE CRASHES AND UNNECESSARY EXPENSES LEARN PROPER SAFETY AND CONTROL MAKE LEARNING TO FLY EASY VASTLY INCREASE YOUR CHANCES OF SUCCESS GREAT FOR CLUB INSTRUC TORS & HOBBY SHOP OWNERS,s - HEM ANY WAY w{o n]g~ BETTER PERFORMANCE NYROD THE ORIGINAL QtbQr PUSH ROD COMPLETE WITH ALL REQUIRED METAL ______________________________________ FITTINGS IDEALLY SUITED FOR ANY PUSH ROD ACTIONj RO\ RUDDERS ELEVATORS AILERONS THROTTLE sr CONTROL BOATS SEA PLANES. YOUR IMAGINATION 34 LONG ASSEMBLED LENGTH at NYROD SU-PR-LINE PROCUCTS INC 18800 State Route 47 E Sidney ONo 45365 PI 5134804721 HARDWARE INCLUDED 14 NYRODapter 18 Rod 2-56 Threaded end problem model simply drills out shall duck Out gig before make misteaks So See ya downwind USOC FF Scale/Warner Continued page 69 have luxury undamaged models after days flying Checking model carefully before flying can definitely help avoid repairs Find steam out wing warps Add little extra weight nose forward CG means greater stability Make sure nose block Rubber model snug going bounce around giving new thrust angle other second Tack glue things together can separate impact wing breaks two little tacked spots still OK thats solidly glued can take half cabin area goes Making wings plug Onto wires boxes better testing avoid windy conditions avoid fully wound Rubber motors have seen mi nor problems could have easily cor rected completely wipe out model due ex tra speed imparted full-power test Use smaller shorter longer rubber motors fewer winds tests engine-powered craft use propellers stalled backwards engines running very rich little rich may lean out scream extra air supply starts coming model tossed Some engines available throttles such G-Mark 035 can slowed down encountering rich/lean problem An engine cutoff timer will help cut ting off fuel flight almostbut quite old spiral dive doom kills models overlong engine runs because turn gets tighter tighter airspeed builds up repair try avoid doing things same way second time big Cleve land Stinson Reliant crash No Bill Say didnt happen RMcM broke wings inside rear spar made jog aileron broke right Id glued upgraded ad hesive repairing going slow-dry ep oxy also added bundles carbon-fiber thread around areas figured would break again smoothing epoxy over squeegee No further problems first crash located weak points added strength can add small wire hard wood pins hold joints together use doublers repair harder materials use cloth reinforce ment over weak areas add gussets etc Just dont put back way first time Once have plane flying well then should go through trouble making model look really super shock seeing fully finished super-detailed model go ultimate trauma hate repairs simple repairs can tolerated model shows promise repairs just bring back originallybecause have made model finished first place Famous goofs department t once forgot re move stuffer stick short inside Macchi C202 Rubber model certainly flew bit weird side Once modeler will notice has nose block upside down modeling clay ballast nose has fallen off very surprised look face often re 172 Model Aviation ci $2 Vt fn c TtiIlgo qIre ma/MI -505
Edition: Model Aviation - 1989/06
Page Numbers: 66, 67, 168, 169, 170, 172
5OOPoieci -T 425 _____171 L1 NFFS NEWS month June looms busy National Free Flight Society NFFS June 1-4 kickoff University Tennessee Minidome 116-ft ceiling John son City TN annual US Indoor Championships will 20 official events host unofficial ones well Area hotel dormitory facilities excellent Indoor buffs can send No 10 SASE USIC 1655 Re vere Dr Brookfield WI 53005 informa tive three-page contest packet begin plan vacations accordingly four days Indoor frolic followed first annual week-long NFFS/US Out door Championships June 19-23 Mid America Air Center near Lawrenceville IL Over 60 events card include facets Outdoor Free Flight competitionand like eat both SAM-type bean feed NFFS banquet works number motels both Lawrence ville neighboring Vincennes IN plenty low-cost dormitory space Vincennes University Get entry information early sending No 10 SASE ad dresses AMA Nostalgia Gas eventsA Italiano 1655 Revere Dr Brookfield WI 53005 Old-Timer events FF RCDon Sachtjen RR #5 Box 56B Bloomfield IN 47424 Flying Aces Clubs Flying Scale eventsLin Reichel 3301 Cindy Lane Erie PA 16506 number initial NFFS entry packets sent out before couple items emerged require clarification First contest flyer specifies Category II conditionswhich printing error impossibility Wind direction crop situations will obviously dictate actual competition flight rules probability proper assume Cate latest plan offering Al Lidberg 40-in-span Jumbo Rubber Scale Cessna Airmaster has knockoff wings Plastic 12-in prop available 66 Model Aviation Free plait Duration Harry Murphy 3824 Oakwood Blvd Anderson IN 4601 Zeek chronicles continue month Drawing shows minor differences between two old kit versions Photo has Bob Watson tuning OS Max 15-powered A/B Zeek prior official flight Fall 1988 contest Lawrenceville IL Its large-stab Premium version gory III conditions will exist Second important omission statement six NFFS-sponsored events will broken up Jr/Sr combined Open age categories events Gas Hand-Launched Glider Embryo Rubber P 30 Rubber Pee Wee 30 Peanut Scale Subse quent entry packets have corrected should have received initial distri bution should correct information accor dingly two back-to-back ventures 1989 examples new energy being exerted within NFFS promote Free Flight competi tion national level can show indi vidual support causes attending above affairs well joining/rejoining/re newing membership case may long-established organization Reaffirm support today sending yearly $15 mem bership fee NFFS 6146 E Cactus Wren Rd Scottsdale AZ 85253 Become bona fide Free Flight booster Bob Klipp directs NFFS Plan Service has advised NFFS listing available plans has now updated 1989 new listing includes 165 designs such noteworthy Power designs Jacksons Pilfered Pearl Verbitskys 1987 BE-48 FLC World Champion get yours send No 10 SASE NFFS Plans 10115 Newbold Dr St Louis MO 63137 Bob also offering full-size plans old fa vorite Satellite 1000 reduced price $5 postpaid first two dozen folks der gone price will re vert normal fee $850 NFFS mem bers $950 nonmembers plus 20% post age serious about obtaining plans either price can send full amount can return excess should order arrive before supply special price exhausted Pertinent potpourri version Vie Cunninghams venerable Geodetic Galaxie available once again Kits $2495 postpaid California residents add $162 tax Make checks payable Galaxie Model Co PO Box 4842 Covina CA 91723 original 585 Vies new Maxi scheduled avail able early 1989 well may wish enquire respect latter Should wish introduction uses space age composites model construction new 1989 MRL Model Research Labs catalog must scratch builder does catalog list new construction materi als accompanying pricings such items Kevlar various carbon fiber configurations alu minum wing skins etc became engrossed page after page in-depth descriptions dos/donts respect proper use various materials catalog just listing var ious high-tech materials offers invaluable formation suggesting appropriate uses composite catalog will dis card send $2 Model Research Labs 25108 Marguerite #160 Mission Viejo CA 92692 Youll receive education modern world composites USA FAI FF Team Manager Roger Simpson has raised SOS respect requesting aid form cash donations help outfit cur rent teams needed support equipment Inter ested individuals clubs can send contribu tions him 2625 Queenswood Dr Rancho Cordova CA 95670 funding goals achieved donate can expect team photo team decal return Okay senior citizens chance relive golden youth Peter Mann advises pos tal contest commemorate 50th anniversary Canadian Jimmy Allen Model Airplane originally kitted 1939 Ontario Model Aircraft Company Model Craft ronto currently being reproduced Easybuilt Models Beamsville Ontario can fly things off football field cant bug Out because lack flying site No excuses attributed bad timing will ac cepted either flights may logged anytime between March 1 September 30 1989 no entry fee also fits well within retirees fixed income Send #10 SASE Peter M Mann 36 Sydenham St Guelph Ontario Canada NiH 2W4 get details Al Lidberg offers 1989 version 10page plans catalog featuring latest addition 40-in-span Jumbo Scale Cessna Airmaster Plans exquisite done Al can tradition old days Comet Model Airplane Company catalog dollarbut its free requested send $6 check plan Four pages building structions three-views full-scale air craft also included address AA Lidberg 614 B Fordham Tempe AZ 85283 Tell him Duration sent Zeek chroniclesPart IV Bill Cranfords Premium Manufacturing Company undertook production large-stab A/B Zeek early Fifties enlisted tire less efforts Lew Mahieu getting project moving Revisions made original Air 0 design concept some being quite obvious others subtle ensuing Korean situation caused under standable metal shortage hardwood engine bearers included kit lieu neat black-painted steel mounts trade mark original Air-O kit offering course enlarged stab rudder changes Continued page 168 June 1989 67 Leo Sullivan did nice job 1AA Nostalgia Gas rendition Hal deBolts vintage Air foiler design Eye-catching color scheme dark green white Space Age materials find way model building constructions about John Voorhees built iAA Gas ship butcher shop meat platters Meredith Chamberlain test runs OS Max 19 Ron Warring-designed Crescendo Wright Field meet Dayton OH British designs becoming popular NosGas Modeling Accessories MASTER AIRSCREW5 Balsa Stripper Precision stripwood easy Balsa Strip per Strips up 1/2 wide 1/4 thick can cut quickly accurately sheet stock vernier wheel advances 1/32 precise adjust ment stripper uses std type 11 hobby blade $495 suggested retail Razor Master iseiew w 1j~lane Plane uses heavy-duty industrial blade held place two locating screws allowing cutting depth set very rigidly accurately Use rounding smoothing contours fuselages cowlings shaping edges thinning strips etc $495 sug gested retail Replacement blades available stock no MA2101 $149 pack 3 Line Filter fuel filter outstanding value has threaded two-part alum num body 100-mesh stainless screen removeable easy cleaning $119 suggested retail Direct Drive 05 Prop Adaptor all-aluminum prop adaptor designed 06 electric motors recommended use Master Airscrew 7x4 7x6 8x4 8x6 propellers $395 suggested retail See Hobby Dealer WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 3I111 1989 Unlbed La AUGUST 20 oStatic Display Fun Fly Swap Shop Air Show Team Competition Information Call 1312USk SHOW 30 Flying DISC V-STOL SUPERIOR Small Field 8- FUN FLY Aircraft STABLE PREDICTABLE 8-AGILE $43 plus piing TX Res add 7% soles fax VISA MIC Foam 8- LIte Ply Construction ELEVON Mixer Included 25- 40cid 3-35 lbs Accurate QUALITY Materials Boston Coupe/Saulsbury Continued page 165 section plastic window area original model rare birds say practically flew right off board As longer motors installed however small amount clay needed nose its first formal contest Boston Coupe took first place flight time 48 seconds stable flier despite its lack dihedral looks very appealing air outdoor flying would add n dihe dral per tip stability first flights used loop %2 rubber about twice length plane Build Boston Coupe let know does Im sure youll pleased results FF Duration/Murphy Continued page 67 intended improve stability de crease size single wheel improved models finished appearance Whereas fuse lage moments remained relatively unchanged fuselage profile itself simplified somewhat resulting little less vertical height difference between stab wing locations Both ver sions depicted glow-powered McCoy 19 up front Air-O kit plans also showed locations ignition coil batteries indicating some first models may have built uti lizing ignition engines power contrast famous Zeek wing came through transformation completely unscathed due convenience utilizing steel-rule rib dies obtained Air-O anything else accompanying drawing indi cates both comparable differences sim ilarities two vintage production kits Fullsize plans both versions A/B Zeek kits available number plan sources Although Lew Mahieu aided bringing itial 1AA Zeek kit hobby shop shelves under Premium Manufacturing Co banner per sonal involvement original Zeek design concept drawing close Premium Lew also involved producing small RTF ready-to-flyRAfcM model supplied Los Angeles Ex aminer newspaper Power K&B 035 glow MIN Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin Bonded Model Products Box 10998 Suite 543 Austin TX 78766 512 250-1420 engine famed newspaper presented youthful paper carriers awards three newspaper subscription starts signed up Lew K&B 1949-53 respon sible kit venture com pany noted its model engine production Lews famous A/B Kiwi design design intended matched new K&B 15 Green Head companys contribu tion fledgling FAL Power competition day Lews talents varied ef forts utilized K&B knowledge fuels engine repair drafting art work K&Bs monthly magazine ad vertisementsnot mention laurels brought upon himself company consistent contest wins K&B eventually sold its interests Kiwi Paul K Guillow Co reproduced original A/B-size kit offered /2A version own Whereas Lew eventually phased out model building active model competition shortly after mid-Fifties left mark history Free Flight man ac complishments Premiums initial Zeek kit offering first flat-bottomed-airfoil spinoffs original undercamber-airfoil Zeek concept Bill Cranford stated writer 1983 letter reason flat-bottomed rib configura tion utilized instance was new building steel-rule dies lot simpler make wing ribs flat bot tom attempting some critical contour Thus another era Zeek legend born accident design ver sions flat-bottomed-airfoil Zeeks Well get topic next meet pages another chapter Zeek story Newsletter spotlight zoom another Free Flight newsletter source month scan ning light beam westward once again halt ing Las Vegas NV time illuminate Vegas Free fighter serves official publication VAMPS Vegas Antique Model Plane So ciety As its name suggests club OldTimer oriented its local flying activ ities take place one-by-four-mile hard clay surface Eldorado Dry Lake lo cated about 25 miles center Vegas Strip clubs alternate site 40 miles west larger area situated State Road 115 California/Nevada border near hotel casino having interesting name Whiskey Petes Sounds like grandiose spot celebrate winning flightsor drown sorrows over crashed model 168 Model Aviation Get ROUN TUfT Today ONLY Money Back GUARANTEE Business 0 0 &A Se2•& j5 s4 90 A5# O b:s &~ d 9tt PLENTY OF FREE PARKING 5 U~MONIUM TINO#4IUM NOinN SALTIMORE w t 411MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- lOam 4pm MARYLAND STATE FAIR GROUNDS TIMON KiM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301 -788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 clubs current officers Larry Lake president Frank Gable secretary/treasurer Phil MeCarey newsletter editor annual club dues $5 monthly meetings third Wednesday month offices URS Consultants Inc use back door very unusual statement made newsletter free nonmembers specific details may wish contact edi tor Phil McCarey 532 College Dr #212 Hen derson NV 89015 known whether have one-armed bandits club meeting room n side saddened hear spotlight going out Bill Bakers muchheralded Okie Flyer newsletter Bill claims burn out demise relatively short-lived one-man publication Oklahoma-based rag rated top attraction time thrived Good luck Billy What going nowtaming wild horses CG location once again Matzs Maxim Murphys Law states conclusion place get tired thinking think shall use cliche ex cuse having published infamous mislead ing formula finding approximate CG model offered February 1989 col umn missed article attempt aid not-so-learned Free Flighters locating approximate center-of-gravity CGor longitudinal balance pointof new model calculations using simplified formula However overzealous wee-hours-ofthe-morning rush complete article rea soning became muddled formula simply stated Sa x Tm CG Ca Sa being stab area Tm being tail mo ment measured point 25% back leading edge average wing chord width comparable point 25% stab chord Wa being area wing finally Ca being average chord wing Thus compu tations instead arriving initial CG point begin flight tests depending type model would net impractical number somehow left out part required com putations reality number can generate equation valuable discard called tail volume coefficient TV0 So formula should really have read Sa x Tm TV0 Ca find CG place seemingly meaningless TV0 number very simple computation TV0 CG 25 25 result should much realistic number CG new model Please note somewhat approxi mate location calculated point teeter-totter between stability stability As surely want hang hat such critical point have 50/50 chance between success disaster first flight need stir safety factor sure initial flights will immune adverse affects initial faulty CG loca tion Therefore since certainly wish favor stable side fulcrum should move starting CG least 5% probably closer 10% forward calculated CG neutral point contest Power models Towline Glid HI TECH GLASS EPPLER 214 134 WINGS TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINS HI PERFORMANCE SAILPLANES oltens high gaalh5 line ol l,lMlo 51$ OlllOlepoxies glass cloth kevia, laminates HP Call wing steeling color FOTO-PAAKSKOKu-FAN 3-vIewSskIn cacallin baggIng nlateels honeycomb beatiad loSing 50000 picures stock3000 drawings stocklasalages wings Contplele panel kits Caslom a0b Snochoe send 5100 SOSE o eampal kIt Sb 00 VIDEO TAPEVHS entie pp cog Wlht proce5s Includes ou vacuum bagging technique $2000 O Shipping Handling HI PERFORMANCE SAILPLANES 17002 NE 155th SI Woodloville WA55072 2011087-1721 NEWSPACESAVING F Itt box 2x7-3l8x 9-18 FUEL CONTAINER Tough Rigid Polyethylene udes cap ostage tubing ernere lock tubing through North Products PO Box 18419 Cleveland Heights OH 44118 I Galj June 1989 169 D- BEST Handcrafted Control Handle 1/2 Plywood Construction 270 lb test Aircraft Cable Stainless Steel Eyes Cable Loop ue 0 Shape Comfortable Grip ly transferred Instructor Student Pilot INTRODUCTORY PRICE BLUE SKY ENTERPRISES $95Rt2Box22BD Inelades ShippineSelma AL 36701 ers starting CG location competition Rubber models like 20% ahead computed CG Average chords wing stab found simply dividing areas spans novice Free Flighter utilization above two formulas plus moving starting CG ahead calculated result sug gested percentages average wing chord de pending type model involved should prevent first flight horror cases traceable mislocated CG As initially stated original ar ticle intended non-tech enthusiasts consider yourself category need read further regard topic However serious modeler might interested researching some following suggested material arrive own conclu sions First should like recognize Bill Bogart Bill McCombs Gil Morris flagging original misdemeanor suggesting past arti cles charts subject Second stated last time would clean up interesting chart publication chart supplied helpful Bill McCombsbut have since second thoughts second thoughts brought about some conflicting information between authors material personally researched wish col umn inadvertently become referee between respected individuals would like sim ply cite typical example said disagreement butt Out technical aspects proper CG location altogether instance refers definition tail moment Tm found three different interpretations depending article being studied Bill Bogart favors Tm distance tween LE leading edge wing quar ter chord 25% rearward LE stab Bill McCombs regards Tm distance between LEs wing stab author Jim OReilly designates Tm distance tween quarter chords both wing stab Chords instances mean average chords can visualize depending camp endorse final computations could vary slightly because using different points measurement reason incorpo rate 5%-20% safety margins after computa tions rate following references well worth investigating heretofore stated may wish draw own conclusions article served initial reference shows up page 88 Zaics 1959-61 Model Aeronautic Year Book article conden sation collaboration between Bill Bogart Bud Rhodes published January 1959 issue Model Airplane News Bill followed up in-depth study static stability 1980 NFFS Symposium cluded CG location world-class competi tion models well discussion contri bution dihedral stability Gil Morris acknowledged Bill Bogarts work subsequent 1984 NFFS Symposium offering simple computer program home computer use aid locating evasive CG types models Meanwhile stumbled across article Jim OReilly leaned primarily toward com petition rubber-powered category also referenced original Bogart/Rhodes work article found January/February 1983 issue NFFS Digest readily understandable should like avoid high tech talk Finally am indebted Bill McCombs efforts supplying various formulations charts wish relay suggestion terested parties may obtain copy Making Scale Model Airplanes Fly discusses CG problems pertain Rubber Scale other competition Rubber model designs well writing have personally sent copy may have too sending $995 plus $105 postage Aircraft Data Box 763576 Dal las TX 75224 conclusion wish thank wrote regard original articlethe critics well unknowing commented appreciated finally seeing something simple printed locating initial CG formal correspondence has answered cor rect information follow-up now clears conscience totally however AL Ponjee may have sent viable formula solving CG problem simple typewrit ten four-sentence notewhile appearing bit drasticmay have its place some instances Anyway Mr Ponjee says has CG Continued page ifl 170 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACH INE CUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $3495 ELECTRA L ITE-ICARUS-PANTERA- METEOR-ELECTRICUS-WHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries MI chargers need packagel Cycler-ChargecsmssCOi Fits 48V FIx 96V Tx packsPlus $5 S&Gelied Cell Others available write call TrickIer$3496Regular Model.. $4696 Radioselectric boat batteriesSpecIfy 612 24V MultiplePlus 83 S&HFor field kit sinaiPlus $3 SH Heavy Duty Model$5896 spool winch large boat andPlus $4 S&H electtoc power charging batteriesSpecify 6 1 2V ProductsSASEcrkVomiatoiPO Box 221 CaRa OealsrnqiMeslrivlid Canton SD 57013 F-mgDEDICATED TO PERFORMANCE SINCE 1959 BRICAN SYNCLJICAN CASTOR DDIT1V &CING GAS OVER 50 Hi-PERFORMANCE PRODUCTS FREE CATALOG 800-242-0489 Get STICKS. Fly RIGHT! 4 Primary Flight Training Program Videoc Teaches basic flight control safety Demonstrates training procedures flight lessons Explains frequency control field rules Utilizes Ground School Flight training Text Beginners Guide Radio Control Sport Flying Douglas R Pratt Tab Books Inc Includes information Academy Model Aeronautics STRUCTURE YOUR LEARNING PROCESS FROM PURCHASE TO LANDING AVOID PREMATURE CRASHES AND UNNECESSARY EXPENSES LEARN PROPER SAFETY AND CONTROL MAKE LEARNING TO FLY EASY VASTLY INCREASE YOUR CHANCES OF SUCCESS GREAT FOR CLUB INSTRUC TORS & HOBBY SHOP OWNERS,s - HEM ANY WAY w{o n]g~ BETTER PERFORMANCE NYROD THE ORIGINAL QtbQr PUSH ROD COMPLETE WITH ALL REQUIRED METAL ______________________________________ FITTINGS IDEALLY SUITED FOR ANY PUSH ROD ACTIONj RO\ RUDDERS ELEVATORS AILERONS THROTTLE sr CONTROL BOATS SEA PLANES. YOUR IMAGINATION 34 LONG ASSEMBLED LENGTH at NYROD SU-PR-LINE PROCUCTS INC 18800 State Route 47 E Sidney ONo 45365 PI 5134804721 HARDWARE INCLUDED 14 NYRODapter 18 Rod 2-56 Threaded end problem model simply drills out shall duck Out gig before make misteaks So See ya downwind USOC FF Scale/Warner Continued page 69 have luxury undamaged models after days flying Checking model carefully before flying can definitely help avoid repairs Find steam out wing warps Add little extra weight nose forward CG means greater stability Make sure nose block Rubber model snug going bounce around giving new thrust angle other second Tack glue things together can separate impact wing breaks two little tacked spots still OK thats solidly glued can take half cabin area goes Making wings plug Onto wires boxes better testing avoid windy conditions avoid fully wound Rubber motors have seen mi nor problems could have easily cor rected completely wipe out model due ex tra speed imparted full-power test Use smaller shorter longer rubber motors fewer winds tests engine-powered craft use propellers stalled backwards engines running very rich little rich may lean out scream extra air supply starts coming model tossed Some engines available throttles such G-Mark 035 can slowed down encountering rich/lean problem An engine cutoff timer will help cut ting off fuel flight almostbut quite old spiral dive doom kills models overlong engine runs because turn gets tighter tighter airspeed builds up repair try avoid doing things same way second time big Cleve land Stinson Reliant crash No Bill Say didnt happen RMcM broke wings inside rear spar made jog aileron broke right Id glued upgraded ad hesive repairing going slow-dry ep oxy also added bundles carbon-fiber thread around areas figured would break again smoothing epoxy over squeegee No further problems first crash located weak points added strength can add small wire hard wood pins hold joints together use doublers repair harder materials use cloth reinforce ment over weak areas add gussets etc Just dont put back way first time Once have plane flying well then should go through trouble making model look really super shock seeing fully finished super-detailed model go ultimate trauma hate repairs simple repairs can tolerated model shows promise repairs just bring back originallybecause have made model finished first place Famous goofs department t once forgot re move stuffer stick short inside Macchi C202 Rubber model certainly flew bit weird side Once modeler will notice has nose block upside down modeling clay ballast nose has fallen off very surprised look face often re 172 Model Aviation ci $2 Vt fn c TtiIlgo qIre ma/MI -505
Edition: Model Aviation - 1989/06
Page Numbers: 66, 67, 168, 169, 170, 172
5OOPoieci -T 425 _____171 L1 NFFS NEWS month June looms busy National Free Flight Society NFFS June 1-4 kickoff University Tennessee Minidome 116-ft ceiling John son City TN annual US Indoor Championships will 20 official events host unofficial ones well Area hotel dormitory facilities excellent Indoor buffs can send No 10 SASE USIC 1655 Re vere Dr Brookfield WI 53005 informa tive three-page contest packet begin plan vacations accordingly four days Indoor frolic followed first annual week-long NFFS/US Out door Championships June 19-23 Mid America Air Center near Lawrenceville IL Over 60 events card include facets Outdoor Free Flight competitionand like eat both SAM-type bean feed NFFS banquet works number motels both Lawrence ville neighboring Vincennes IN plenty low-cost dormitory space Vincennes University Get entry information early sending No 10 SASE ad dresses AMA Nostalgia Gas eventsA Italiano 1655 Revere Dr Brookfield WI 53005 Old-Timer events FF RCDon Sachtjen RR #5 Box 56B Bloomfield IN 47424 Flying Aces Clubs Flying Scale eventsLin Reichel 3301 Cindy Lane Erie PA 16506 number initial NFFS entry packets sent out before couple items emerged require clarification First contest flyer specifies Category II conditionswhich printing error impossibility Wind direction crop situations will obviously dictate actual competition flight rules probability proper assume Cate latest plan offering Al Lidberg 40-in-span Jumbo Rubber Scale Cessna Airmaster has knockoff wings Plastic 12-in prop available 66 Model Aviation Free plait Duration Harry Murphy 3824 Oakwood Blvd Anderson IN 4601 Zeek chronicles continue month Drawing shows minor differences between two old kit versions Photo has Bob Watson tuning OS Max 15-powered A/B Zeek prior official flight Fall 1988 contest Lawrenceville IL Its large-stab Premium version gory III conditions will exist Second important omission statement six NFFS-sponsored events will broken up Jr/Sr combined Open age categories events Gas Hand-Launched Glider Embryo Rubber P 30 Rubber Pee Wee 30 Peanut Scale Subse quent entry packets have corrected should have received initial distri bution should correct information accor dingly two back-to-back ventures 1989 examples new energy being exerted within NFFS promote Free Flight competi tion national level can show indi vidual support causes attending above affairs well joining/rejoining/re newing membership case may long-established organization Reaffirm support today sending yearly $15 mem bership fee NFFS 6146 E Cactus Wren Rd Scottsdale AZ 85253 Become bona fide Free Flight booster Bob Klipp directs NFFS Plan Service has advised NFFS listing available plans has now updated 1989 new listing includes 165 designs such noteworthy Power designs Jacksons Pilfered Pearl Verbitskys 1987 BE-48 FLC World Champion get yours send No 10 SASE NFFS Plans 10115 Newbold Dr St Louis MO 63137 Bob also offering full-size plans old fa vorite Satellite 1000 reduced price $5 postpaid first two dozen folks der gone price will re vert normal fee $850 NFFS mem bers $950 nonmembers plus 20% post age serious about obtaining plans either price can send full amount can return excess should order arrive before supply special price exhausted Pertinent potpourri version Vie Cunninghams venerable Geodetic Galaxie available once again Kits $2495 postpaid California residents add $162 tax Make checks payable Galaxie Model Co PO Box 4842 Covina CA 91723 original 585 Vies new Maxi scheduled avail able early 1989 well may wish enquire respect latter Should wish introduction uses space age composites model construction new 1989 MRL Model Research Labs catalog must scratch builder does catalog list new construction materi als accompanying pricings such items Kevlar various carbon fiber configurations alu minum wing skins etc became engrossed page after page in-depth descriptions dos/donts respect proper use various materials catalog just listing var ious high-tech materials offers invaluable formation suggesting appropriate uses composite catalog will dis card send $2 Model Research Labs 25108 Marguerite #160 Mission Viejo CA 92692 Youll receive education modern world composites USA FAI FF Team Manager Roger Simpson has raised SOS respect requesting aid form cash donations help outfit cur rent teams needed support equipment Inter ested individuals clubs can send contribu tions him 2625 Queenswood Dr Rancho Cordova CA 95670 funding goals achieved donate can expect team photo team decal return Okay senior citizens chance relive golden youth Peter Mann advises pos tal contest commemorate 50th anniversary Canadian Jimmy Allen Model Airplane originally kitted 1939 Ontario Model Aircraft Company Model Craft ronto currently being reproduced Easybuilt Models Beamsville Ontario can fly things off football field cant bug Out because lack flying site No excuses attributed bad timing will ac cepted either flights may logged anytime between March 1 September 30 1989 no entry fee also fits well within retirees fixed income Send #10 SASE Peter M Mann 36 Sydenham St Guelph Ontario Canada NiH 2W4 get details Al Lidberg offers 1989 version 10page plans catalog featuring latest addition 40-in-span Jumbo Scale Cessna Airmaster Plans exquisite done Al can tradition old days Comet Model Airplane Company catalog dollarbut its free requested send $6 check plan Four pages building structions three-views full-scale air craft also included address AA Lidberg 614 B Fordham Tempe AZ 85283 Tell him Duration sent Zeek chroniclesPart IV Bill Cranfords Premium Manufacturing Company undertook production large-stab A/B Zeek early Fifties enlisted tire less efforts Lew Mahieu getting project moving Revisions made original Air 0 design concept some being quite obvious others subtle ensuing Korean situation caused under standable metal shortage hardwood engine bearers included kit lieu neat black-painted steel mounts trade mark original Air-O kit offering course enlarged stab rudder changes Continued page 168 June 1989 67 Leo Sullivan did nice job 1AA Nostalgia Gas rendition Hal deBolts vintage Air foiler design Eye-catching color scheme dark green white Space Age materials find way model building constructions about John Voorhees built iAA Gas ship butcher shop meat platters Meredith Chamberlain test runs OS Max 19 Ron Warring-designed Crescendo Wright Field meet Dayton OH British designs becoming popular NosGas Modeling Accessories MASTER AIRSCREW5 Balsa Stripper Precision stripwood easy Balsa Strip per Strips up 1/2 wide 1/4 thick can cut quickly accurately sheet stock vernier wheel advances 1/32 precise adjust ment stripper uses std type 11 hobby blade $495 suggested retail Razor Master iseiew w 1j~lane Plane uses heavy-duty industrial blade held place two locating screws allowing cutting depth set very rigidly accurately Use rounding smoothing contours fuselages cowlings shaping edges thinning strips etc $495 sug gested retail Replacement blades available stock no MA2101 $149 pack 3 Line Filter fuel filter outstanding value has threaded two-part alum num body 100-mesh stainless screen removeable easy cleaning $119 suggested retail Direct Drive 05 Prop Adaptor all-aluminum prop adaptor designed 06 electric motors recommended use Master Airscrew 7x4 7x6 8x4 8x6 propellers $395 suggested retail See Hobby Dealer WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 3I111 1989 Unlbed La AUGUST 20 oStatic Display Fun Fly Swap Shop Air Show Team Competition Information Call 1312USk SHOW 30 Flying DISC V-STOL SUPERIOR Small Field 8- FUN FLY Aircraft STABLE PREDICTABLE 8-AGILE $43 plus piing TX Res add 7% soles fax VISA MIC Foam 8- LIte Ply Construction ELEVON Mixer Included 25- 40cid 3-35 lbs Accurate QUALITY Materials Boston Coupe/Saulsbury Continued page 165 section plastic window area original model rare birds say practically flew right off board As longer motors installed however small amount clay needed nose its first formal contest Boston Coupe took first place flight time 48 seconds stable flier despite its lack dihedral looks very appealing air outdoor flying would add n dihe dral per tip stability first flights used loop %2 rubber about twice length plane Build Boston Coupe let know does Im sure youll pleased results FF Duration/Murphy Continued page 67 intended improve stability de crease size single wheel improved models finished appearance Whereas fuse lage moments remained relatively unchanged fuselage profile itself simplified somewhat resulting little less vertical height difference between stab wing locations Both ver sions depicted glow-powered McCoy 19 up front Air-O kit plans also showed locations ignition coil batteries indicating some first models may have built uti lizing ignition engines power contrast famous Zeek wing came through transformation completely unscathed due convenience utilizing steel-rule rib dies obtained Air-O anything else accompanying drawing indi cates both comparable differences sim ilarities two vintage production kits Fullsize plans both versions A/B Zeek kits available number plan sources Although Lew Mahieu aided bringing itial 1AA Zeek kit hobby shop shelves under Premium Manufacturing Co banner per sonal involvement original Zeek design concept drawing close Premium Lew also involved producing small RTF ready-to-flyRAfcM model supplied Los Angeles Ex aminer newspaper Power K&B 035 glow MIN Conat Time HOVERABLE Durable UNUSUAL Will NOT Spin Bonded Model Products Box 10998 Suite 543 Austin TX 78766 512 250-1420 engine famed newspaper presented youthful paper carriers awards three newspaper subscription starts signed up Lew K&B 1949-53 respon sible kit venture com pany noted its model engine production Lews famous A/B Kiwi design design intended matched new K&B 15 Green Head companys contribu tion fledgling FAL Power competition day Lews talents varied ef forts utilized K&B knowledge fuels engine repair drafting art work K&Bs monthly magazine ad vertisementsnot mention laurels brought upon himself company consistent contest wins K&B eventually sold its interests Kiwi Paul K Guillow Co reproduced original A/B-size kit offered /2A version own Whereas Lew eventually phased out model building active model competition shortly after mid-Fifties left mark history Free Flight man ac complishments Premiums initial Zeek kit offering first flat-bottomed-airfoil spinoffs original undercamber-airfoil Zeek concept Bill Cranford stated writer 1983 letter reason flat-bottomed rib configura tion utilized instance was new building steel-rule dies lot simpler make wing ribs flat bot tom attempting some critical contour Thus another era Zeek legend born accident design ver sions flat-bottomed-airfoil Zeeks Well get topic next meet pages another chapter Zeek story Newsletter spotlight zoom another Free Flight newsletter source month scan ning light beam westward once again halt ing Las Vegas NV time illuminate Vegas Free fighter serves official publication VAMPS Vegas Antique Model Plane So ciety As its name suggests club OldTimer oriented its local flying activ ities take place one-by-four-mile hard clay surface Eldorado Dry Lake lo cated about 25 miles center Vegas Strip clubs alternate site 40 miles west larger area situated State Road 115 California/Nevada border near hotel casino having interesting name Whiskey Petes Sounds like grandiose spot celebrate winning flightsor drown sorrows over crashed model 168 Model Aviation Get ROUN TUfT Today ONLY Money Back GUARANTEE Business 0 0 &A Se2•& j5 s4 90 A5# O b:s &~ d 9tt PLENTY OF FREE PARKING 5 U~MONIUM TINO#4IUM NOinN SALTIMORE w t 411MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- lOam 4pm MARYLAND STATE FAIR GROUNDS TIMON KiM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301 -788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 clubs current officers Larry Lake president Frank Gable secretary/treasurer Phil MeCarey newsletter editor annual club dues $5 monthly meetings third Wednesday month offices URS Consultants Inc use back door very unusual statement made newsletter free nonmembers specific details may wish contact edi tor Phil McCarey 532 College Dr #212 Hen derson NV 89015 known whether have one-armed bandits club meeting room n side saddened hear spotlight going out Bill Bakers muchheralded Okie Flyer newsletter Bill claims burn out demise relatively short-lived one-man publication Oklahoma-based rag rated top attraction time thrived Good luck Billy What going nowtaming wild horses CG location once again Matzs Maxim Murphys Law states conclusion place get tired thinking think shall use cliche ex cuse having published infamous mislead ing formula finding approximate CG model offered February 1989 col umn missed article attempt aid not-so-learned Free Flighters locating approximate center-of-gravity CGor longitudinal balance pointof new model calculations using simplified formula However overzealous wee-hours-ofthe-morning rush complete article rea soning became muddled formula simply stated Sa x Tm CG Ca Sa being stab area Tm being tail mo ment measured point 25% back leading edge average wing chord width comparable point 25% stab chord Wa being area wing finally Ca being average chord wing Thus compu tations instead arriving initial CG point begin flight tests depending type model would net impractical number somehow left out part required com putations reality number can generate equation valuable discard called tail volume coefficient TV0 So formula should really have read Sa x Tm TV0 Ca find CG place seemingly meaningless TV0 number very simple computation TV0 CG 25 25 result should much realistic number CG new model Please note somewhat approxi mate location calculated point teeter-totter between stability stability As surely want hang hat such critical point have 50/50 chance between success disaster first flight need stir safety factor sure initial flights will immune adverse affects initial faulty CG loca tion Therefore since certainly wish favor stable side fulcrum should move starting CG least 5% probably closer 10% forward calculated CG neutral point contest Power models Towline Glid HI TECH GLASS EPPLER 214 134 WINGS TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINS HI PERFORMANCE SAILPLANES oltens high gaalh5 line ol l,lMlo 51$ OlllOlepoxies glass cloth kevia, laminates HP Call wing steeling color FOTO-PAAKSKOKu-FAN 3-vIewSskIn cacallin baggIng nlateels honeycomb beatiad loSing 50000 picures stock3000 drawings stocklasalages wings Contplele panel kits Caslom a0b Snochoe send 5100 SOSE o eampal kIt Sb 00 VIDEO TAPEVHS entie pp cog Wlht proce5s Includes ou vacuum bagging technique $2000 O Shipping Handling HI PERFORMANCE SAILPLANES 17002 NE 155th SI Woodloville WA55072 2011087-1721 NEWSPACESAVING F Itt box 2x7-3l8x 9-18 FUEL CONTAINER Tough Rigid Polyethylene udes cap ostage tubing ernere lock tubing through North Products PO Box 18419 Cleveland Heights OH 44118 I Galj June 1989 169 D- BEST Handcrafted Control Handle 1/2 Plywood Construction 270 lb test Aircraft Cable Stainless Steel Eyes Cable Loop ue 0 Shape Comfortable Grip ly transferred Instructor Student Pilot INTRODUCTORY PRICE BLUE SKY ENTERPRISES $95Rt2Box22BD Inelades ShippineSelma AL 36701 ers starting CG location competition Rubber models like 20% ahead computed CG Average chords wing stab found simply dividing areas spans novice Free Flighter utilization above two formulas plus moving starting CG ahead calculated result sug gested percentages average wing chord de pending type model involved should prevent first flight horror cases traceable mislocated CG As initially stated original ar ticle intended non-tech enthusiasts consider yourself category need read further regard topic However serious modeler might interested researching some following suggested material arrive own conclu sions First should like recognize Bill Bogart Bill McCombs Gil Morris flagging original misdemeanor suggesting past arti cles charts subject Second stated last time would clean up interesting chart publication chart supplied helpful Bill McCombsbut have since second thoughts second thoughts brought about some conflicting information between authors material personally researched wish col umn inadvertently become referee between respected individuals would like sim ply cite typical example said disagreement butt Out technical aspects proper CG location altogether instance refers definition tail moment Tm found three different interpretations depending article being studied Bill Bogart favors Tm distance tween LE leading edge wing quar ter chord 25% rearward LE stab Bill McCombs regards Tm distance between LEs wing stab author Jim OReilly designates Tm distance tween quarter chords both wing stab Chords instances mean average chords can visualize depending camp endorse final computations could vary slightly because using different points measurement reason incorpo rate 5%-20% safety margins after computa tions rate following references well worth investigating heretofore stated may wish draw own conclusions article served initial reference shows up page 88 Zaics 1959-61 Model Aeronautic Year Book article conden sation collaboration between Bill Bogart Bud Rhodes published January 1959 issue Model Airplane News Bill followed up in-depth study static stability 1980 NFFS Symposium cluded CG location world-class competi tion models well discussion contri bution dihedral stability Gil Morris acknowledged Bill Bogarts work subsequent 1984 NFFS Symposium offering simple computer program home computer use aid locating evasive CG types models Meanwhile stumbled across article Jim OReilly leaned primarily toward com petition rubber-powered category also referenced original Bogart/Rhodes work article found January/February 1983 issue NFFS Digest readily understandable should like avoid high tech talk Finally am indebted Bill McCombs efforts supplying various formulations charts wish relay suggestion terested parties may obtain copy Making Scale Model Airplanes Fly discusses CG problems pertain Rubber Scale other competition Rubber model designs well writing have personally sent copy may have too sending $995 plus $105 postage Aircraft Data Box 763576 Dal las TX 75224 conclusion wish thank wrote regard original articlethe critics well unknowing commented appreciated finally seeing something simple printed locating initial CG formal correspondence has answered cor rect information follow-up now clears conscience totally however AL Ponjee may have sent viable formula solving CG problem simple typewrit ten four-sentence notewhile appearing bit drasticmay have its place some instances Anyway Mr Ponjee says has CG Continued page ifl 170 Model Aviation PRESENTING FL INGER THE ULTIMATE SMALL SAILPLANE HANDLAUNCH HI-STARTorSLOPE WINGSPAN 57 WEIGHT l2oz MACH INE CUT PARTS DEALERS&DIST INQUIRIES INVITEDFLINGER LJMP 110 $3495 ELECTRA L ITE-ICARUS-PANTERA- METEOR-ELECTRICUS-WHISTLER PR ELUDE-COMET LARRY JOLLY MODEL PRODUCTS 5501 W COMO SANTA ANA CALIFORNIA 92703 714 826 6861 WHEN YOU FORGET\OUR UNITS REMEMBER RC System NICd Batteries MI chargers need packagel Cycler-ChargecsmssCOi Fits 48V FIx 96V Tx packsPlus $5 S&Gelied Cell Others available write call TrickIer$3496Regular Model.. $4696 Radioselectric boat batteriesSpecIfy 612 24V MultiplePlus 83 S&HFor field kit sinaiPlus $3 SH Heavy Duty Model$5896 spool winch large boat andPlus $4 S&H electtoc power charging batteriesSpecify 6 1 2V ProductsSASEcrkVomiatoiPO Box 221 CaRa OealsrnqiMeslrivlid Canton SD 57013 F-mgDEDICATED TO PERFORMANCE SINCE 1959 BRICAN SYNCLJICAN CASTOR DDIT1V &CING GAS OVER 50 Hi-PERFORMANCE PRODUCTS FREE CATALOG 800-242-0489 Get STICKS. Fly RIGHT! 4 Primary Flight Training Program Videoc Teaches basic flight control safety Demonstrates training procedures flight lessons Explains frequency control field rules Utilizes Ground School Flight training Text Beginners Guide Radio Control Sport Flying Douglas R Pratt Tab Books Inc Includes information Academy Model Aeronautics STRUCTURE YOUR LEARNING PROCESS FROM PURCHASE TO LANDING AVOID PREMATURE CRASHES AND UNNECESSARY EXPENSES LEARN PROPER SAFETY AND CONTROL MAKE LEARNING TO FLY EASY VASTLY INCREASE YOUR CHANCES OF SUCCESS GREAT FOR CLUB INSTRUC TORS & HOBBY SHOP OWNERS,s - HEM ANY WAY w{o n]g~ BETTER PERFORMANCE NYROD THE ORIGINAL QtbQr PUSH ROD COMPLETE WITH ALL REQUIRED METAL ______________________________________ FITTINGS IDEALLY SUITED FOR ANY PUSH ROD ACTIONj RO\ RUDDERS ELEVATORS AILERONS THROTTLE sr CONTROL BOATS SEA PLANES. YOUR IMAGINATION 34 LONG ASSEMBLED LENGTH at NYROD SU-PR-LINE PROCUCTS INC 18800 State Route 47 E Sidney ONo 45365 PI 5134804721 HARDWARE INCLUDED 14 NYRODapter 18 Rod 2-56 Threaded end problem model simply drills out shall duck Out gig before make misteaks So See ya downwind USOC FF Scale/Warner Continued page 69 have luxury undamaged models after days flying Checking model carefully before flying can definitely help avoid repairs Find steam out wing warps Add little extra weight nose forward CG means greater stability Make sure nose block Rubber model snug going bounce around giving new thrust angle other second Tack glue things together can separate impact wing breaks two little tacked spots still OK thats solidly glued can take half cabin area goes Making wings plug Onto wires boxes better testing avoid windy conditions avoid fully wound Rubber motors have seen mi nor problems could have easily cor rected completely wipe out model due ex tra speed imparted full-power test Use smaller shorter longer rubber motors fewer winds tests engine-powered craft use propellers stalled backwards engines running very rich little rich may lean out scream extra air supply starts coming model tossed Some engines available throttles such G-Mark 035 can slowed down encountering rich/lean problem An engine cutoff timer will help cut ting off fuel flight almostbut quite old spiral dive doom kills models overlong engine runs because turn gets tighter tighter airspeed builds up repair try avoid doing things same way second time big Cleve land Stinson Reliant crash No Bill Say didnt happen RMcM broke wings inside rear spar made jog aileron broke right Id glued upgraded ad hesive repairing going slow-dry ep oxy also added bundles carbon-fiber thread around areas figured would break again smoothing epoxy over squeegee No further problems first crash located weak points added strength can add small wire hard wood pins hold joints together use doublers repair harder materials use cloth reinforce ment over weak areas add gussets etc Just dont put back way first time Once have plane flying well then should go through trouble making model look really super shock seeing fully finished super-detailed model go ultimate trauma hate repairs simple repairs can tolerated model shows promise repairs just bring back originallybecause have made model finished first place Famous goofs department t once forgot re move stuffer stick short inside Macchi C202 Rubber model certainly flew bit weird side Once modeler will notice has nose block upside down modeling clay ballast nose has fallen off very surprised look face often re 172 Model Aviation ci $2 Vt fn c TtiIlgo qIre ma/MI -505