Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A
Edition: Model Aviation - 1984/01
Page Numbers: 40, 41, 42, 43, 44, 138, 139
Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A
Edition: Model Aviation - 1984/01
Page Numbers: 40, 41, 42, 43, 44, 138, 139
Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A
Edition: Model Aviation - 1984/01
Page Numbers: 40, 41, 42, 43, 44, 138, 139
Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A
Edition: Model Aviation - 1984/01
Page Numbers: 40, 41, 42, 43, 44, 138, 139
Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A
Edition: Model Aviation - 1984/01
Page Numbers: 40, 41, 42, 43, 44, 138, 139
Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A
Edition: Model Aviation - 1984/01
Page Numbers: 40, 41, 42, 43, 44, 138, 139
Bob Beckman Dick Roe U installment authors check out describe four engines use Giant Scale field including revisit old friend new formthe 0-35 electronic ignition Use PK Products Superstarter found big aid project Part 7 OF ALL OUR engine reports date has turned out difficult some respects easiest others combination weather equipment prob lems forced us have total four ses sions order complete runs four en gines Normally would session spread out March June cool conditions first runs hot humid conditions completion first runs big 43 co in Hornet clear cool day March things moving along nicely got early start expected make runs four engines day Toward end runs Hornet found fatigue fracture part test-stand engine mount Since us front engine least part time under circumstances neither us wanteu quit day During following week test stand completely overhauled planned finish things off weekend Natu rally rained weekendand next next getting close time Toledo show Roush Mfg needed two engines Cobra Cobra Jr companys dis play booth both planned go Toledo anyway everything put hold Late April got Cobra back Cobra Jr turns out due supply difficulties Roush drop Jr Theyre working replacement meantime find another en gine round out group already planning new Q-50 Quadra decided include electronic ig PropZDTZZ-18DTZZ-18DTZZZ Engine18-518-618-618-66-1018-818-818-88-1418-10 18-10 18-10 18-12 1814 Quadra Idle RPM2300 2100 2300 2300 2400 2300 24002400 2400 2400 2400 2400 2400 0-35Top RPM9500 7400 8400 7900 7400 7100 76006100 6800 6900 7200 6200 5600 2cidLbThrust 16145165171675 13171475 1617171613 CobraIdle RPM25002600 2200 23002650 2300 2100 2150 23 cid Top RPM79507900 7800 66007000 7000 6600 6100 LbThrust195195181818172017 Quadra Idle RPM 2400 2200 2300 2400 2200 2200 0-50Top RPM6950 7400 7650 7750 6600 6450 3 cidLb Thrust2019521520520175 Hornet Idle RPM - DDynathrust KKolbo 43cid Top RPM Lb Thrust- TTop FliteZZinger 40 Model Aviation new style Big Banger starting finger Dick Roe holding prop against wound-up Superstarter spring releases Quadra will running QUADRA Q-35 ELEC IGN ENGINE DATA Displacement 34cc 207 cu Supplier Trinden Mfg Ltd TML Price $13695 PO Box 544 Huron Pk Availability Dealers throughout Ont Canada NOM 1YOMfg TMLthe world Original Use ChainsawWeight 3 lb 13 oz TEST DATA SUMMARY Max thrust 1825 lb 6700 rpm Kolbo 20-5 prop 201 fuel mix 134 oz/min fuel Consumption Accessories supplied Engine mount stamped plate optl cast alum Prop hub Yes single bolt Muffler No Other none Additional items required excluding prop fuel tank Rt-angle throttle link Recommended propeller 18-6 208 Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available High low mixture Idle stop screw Ignition Type ElectronIc CD Spark plug Champion RCJ-7YRecommended gap 0025 Magneto gap 0010 inPoint gap N/A Kill disable system Grounding lug available magneto Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft One piece forged steel Bearings Roller bearings front rear Conrod Stamped steel plate Bearings Ball bearing wrist pin roller bearings crankshaft Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 61/4 op tional cast mount 2 Prop rearmost point excluding rear shaft 53/4 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5/2 top fin 3-5/8 behind prop 5 Vertical dimensions thrust line a Up 51/2 top fin 3-5/8 behind prop b Down 1/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3-11/16 carb 2 behind prop 7 Propeller hub diameter 1-9/16 Bolt hole pattern diameter Single 5/16-24 8 Propeller washer 1/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw compact 2 Amount quality instructions Adequate 3 Ease starting See comments Superstarter 4 Ease mounting control hook-up Right-angle throttle lInk age needed 5 Ease carburetor adjustments Only idle screw accessible wIth engine running 6 Vibration levels Typical Quadra excessive 7 Cowlability Rear exhaust side-mounted carb can cause trouble small models 8 Crankshaft bearing lateral play Less noticeable earlier Quadras nition version Q-35 About time received sample new H&K Superstarter Q-35 took look got phone PK Products begged another Q-50 These little jewels what made batch engine runs easiest weve havent heard about yet Superstarter simple inexpensive device makes starting Big Banger easy snapping fingers heavy coil spring one-way clutch mount rear shaft engine wind spring turn pulling prop back wards release prop spring powers engine through two three times does fast enough generate good spark kind ignition sys tem Installation starter simple few ounces involved nothing com pared advantages Anyone Quadra would foolish invest think fact Quadra peo ple talking about making starter standard accessory Quadras near future Unfortunately starter available engines Currently can get both Quadras Magnum II Any engine rear shaft potential candidate engine usually requires unique combination clutch housing means special tooling As anything else means large-quantity market must exist before practical go production de mand particular engine great enough sure PK will meet should obvious now very enthusiastic about Superstarter consider problem presented need run four engines 30 50 propellers day usually can understand enthusi asm extreme case anyone has ever worn-out arm trying get engine going will just enthusiastic Getting back struggles complete engine runs now up late April KDTZZ-20DTZZ-20DTZZZProp 20-520-620-620-66-1020-820-820-88-1420-10 20-10 20-10 20-1 1 20-12Engine [v32][b-1-10-1-10]] 24002300240024002400240024002300240023002200220024002200idle RPMQuadra 76007200690072006100660063006400520056005700590056005600Top RPMQ-35 182516181617751717751815251616171725165LbThrust2cid 2600260025002850250028002600230022002250240024002100idle RPMCobra 7900730069507200660068506700670058506200645062006200Top RPM23 cid 2051719518520518522201919522521215Lb Thrust 2300240022002200190022002450285021502100230020002200idle RPMQuadra 8100785075007900685071506950700059506400665064006200Top RPMQ-50 212021520522522232220522524523235 Lb Thrust 3 cid [v32][b-1-10-1-10]] 2200Idle RPMHornet 7200Top RPM43 cid 295Lb Thrust [v32][b-1-10-1-10]] January 1984 41 S 0 S S COBRA ENGINE DATA Displacement 23 Cu Supplier Roush Manufacturing Rear 3405 Cleveland Ave SW Canton OH 44707 Original use Blower Price $14995 Availability Direct Mfg Zenosh Weight 5 lb 14 oz TEST DATA SUMMARY Max thrust 225 lb 6450 rpm Zlnger 20-10 prop 501 fuel mix 18 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank None Recommended prop 18-8 20-10 Recommended fuel mix 501 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Low mixture Idle stop Ignition Type Mechanical points Spark plug Champion RCJ8 Recommended gap 0025 0028 Magneto gap Fixed Point gap 0014 0016 Kill disable system None provided Internal details Induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft Three-piece forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 6-5/8 2 Prop rearmost point excluding rear shaft 6-5/8 3 Prop forwardmost poInt 1-9/16 cylinder fin 4 Maximum extension thrust line 6I4 plug 2-7/8 hind prop 5 VertIcal dimensIons thrust line a Up 6 plug 2-7/8 behind prop b Down 2-3/16 crankcase tap plug 2/2 behind prop 6 Horizontal extension thrust line 31/2 carb 3 hind prop 7 Propeller hub diameter 1-5/8 Bolt hole pattern diameter 7/8 8-32 bolts 8 Propeller washer 1-5/8 diameter 3/16-In aluminum 9 Mounting bolt pattern 3/4 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Clean trim 2 Amount quality instructions Brief adequate 3 Ease starting Goodespecially larger props Cold 5 10 flips b Hot 2 3 flIps 4 Ease mounting control hook-up SImple radial mount straight throttle linkage 5 Ease carburetor adjustments Very accessible 6 VIbration levels Fair blower engine 7 Cowlability Good except side-mounted carb 8 Crankshaft bearing lateral play None detectable early May Weve finally got what looks like good weekend weve got starters two four engines short order complete last few runs Hornet move Q-50 first experi ence starter performs ad vertised Before long brand new engine off running its initial break-in ran trouble After breakin run changed props started test runs time prop re leased bang engine horrible grating noises rear shaft Pulling engine off mount found one-way clutch now two-way clutch anchor loop spring snapped off reflection realized inadvertently wound spring too tightly before releasing prop overstressed broken clutch set Q-50 aside went Q-35 Being careful wind starter spring no turn got through runs Q-35 no trouble ease starting phenomenal really speeded up rather tedious job quickly sold starter despite problem Q-50 time pretty sure done ourselves anyway Unfortunately meant now two engines Q-50 Co bra would have start hand no sooner got started Cobra however nice day suddenly came downpour hastily packed up ruefully contemplated fact almost three months managed test two engines set sights fol lowing weekend hoped best additional delay did have happy result able get replacement Q-50 starter final session rela tively speaking breeze starter Q-50 worked flawlessly Cobra turned out fairly easy-starting engine After much stumbling fumbling fi nally data presented addition Superstarters some new props try new 'progressive pitch propellers Zinger years like admit have using true pitch props angle blade decreases hub tip theoretical advance per revolu tion airscrew remains same points along blade new props pitch varies low hub high tip variabe pitch usual sense term call ing progressive pitch some angle actually increases toward tip What does buy Any seems number different answers ZT ZTZDZZZZZZZZ Engine 20-14 22-622-622-8 22-822-10 22-10 22-12 22-14 24-6 24-8 24-10 24-12 24-14 CobraIdle RPM2100 2250 2400 2300 23002200 2000 1900 2250 2150 2100 1900 23 cid Top RPM5650 6600 6650 6200 63505750 5300 4400 6200 5650 5000 4400 Lb Thrust 1821192222212051622521521517 Quadra Idle RPM2100 2000 2150 1950 2000 2150 2100 2100 2150 2100 2150 2200 0-50Top RPM5850 6850 7100 6300 6600 6300 6000 5400 4600 6350 5800 5600 3cidLb Thrust 20225222452552352322185232523 Hornet Idle RPM2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 43cid Top RPM6600 7600 7800 7300 7500 7300 6800 6400 5800 7300 6800 6200 5700 4900 Lb Thrust 293130535335305335332953436535305 42 Model Aviation QUADRA Q-50 ENGINE DATA Displacement 50cc 3049 Cu Price $24995 Availability Dealers throughout Mfg TML the world Weight 5 lb 1 oz option al mount Supplier Trinden Mfg Ltd TML PO Box 544 Huron Pk Ont Canada NOM 1YO Original use Model aircraft TEST DATA SUMMARY Max thrust 255 lb 6350 rpm Zinger 22-8 prop 201 fuel mix 153 oz/min fuel Consumption Accessories supplied Engine mount Stamped steel plate optional cast aluminum Prop hub Yes single bolt Muffler Noavailable Other None Additional items required excluding prop fuel tank None Recommended propeller 20 24 dla 8 14 pitch Recommended fuel mix 201 Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments available Hi Lo mixture idle stop screw ignition Type Electronic CD Spark plug Champion RCJ-7Y Recommended gap specified Magneto gap specified Point gap N/A Kill disable system Ground connection available magneto internal details induction Piston porting Cylinder Cast aluminum chromed Piston rings Cast aluminum ring Crankshaft Forged steel Bearings Ball bearings front rear Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-7/8 op tional cast mount 2 Prop rearmost point excluding rear shaft 5-15/16 alter nate magneto bosses 3 Prop forwardmost point 1-1/8 magneto 4 Maximum extension thust line 6-1/8 plug 41/8 5 Vertical dimensions thrust line behind prop Up 5 plug 4-1/8 behind prop b Down 1/4 flywheel 1-9/16 behind prop 6 Horizontal extension thrust line 31/4 carb 3-5/8 behind prop 7 Propeller hub dia 1/4 Bolt hole pattern dia Single 5/1624 8 Propeller washer 11/2 diameter 1/4 aluminum 9 Mounting bolt pattern cast mount 2-5/16 square centered shaft Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Compact clean 2Amount quality instructions 5 pages Useful instructions lacks info such plug magneto gap settings 3Ease starting See comments Superstarter 4Ease mounting control hook-up Simple Optional mount Throttle hook-up straightforward 5Ease carb adjustments Readily accessible engine running 6Vibration levels Comparable original Quadra 7Cowlability Side-mounted carb may protrude very narrow cowls 8Crankshaft bearing lateral play Barely detectable youll get questions almost equal number people ask havent chance use props air yet weve seen action talked people have using right prop engine plane its almost constant-speed prop Ihe engine Engine speed seems nearly constant through almost maneuver Performance low aircraft speeds ie takeoff vertical climbs improved hurting high-speed per formance Dont look anything spectacular test results however have said right start static thrust doesnt come close telling full story about engine propeller performance useful testing because helps show relative performance different engines thing counts long run performance air what weve seen heard new props Zinger perform counts Now subjective comments four engines HorBet bie blocky-looking engine typical chainsaw appearance engine big larger-than-usual flywheel its excessively large its displacement first reaction sort Ho-hum another big chainsaw mill prop pleasantly surprised Hor nets performance First expected bear start surprisingly easy get going long reasonably large prop got down some smaller sizes bit balky its best props up 22 24-in range really isnt prob January 1984 43 Left Dick Roe relaxes breeze 0-50s fuel consumption test welcome change frantic prop swapping Right Bob Beckman takes turn Note both Dick Bob wisely using hearing protectors Look props Youll see results charts Supplier Homer Sales 300 Dixie Hwy Beecher IL 60401 Original use Chainsaw TEST DATA SUMMARY Max thrust 365 lb 6800 rpm wIth Zlnger 24-8 prop 161 fuel mix 215 oz/min fuel consumptIOn Accessories supplied Engine mount Optional Prop hub Yes six bolt Muffler Optional Other None Additional items required excluding prop fuel tank Rightangle throttle link Recommended propellerRecommended fuel mix 161 Carburetor Make type Tliiotson diaphragm pump Controls available Throttle choke Adjustments available HI Lo mixture Idle stop screw Ignition Type Electronic CD Spark plug Champion RCJ7YRecommended gap 0025 Magneto gap 0007 inPoint gap N/A Kill disable system ground lead available Internal details induction Reed valve Cylinder Cast aluminum chromed Piston rings Cast aluminum two rings Crankshaft 3-piece forged steel Bearings Needle bearings front rear plus thrust bearings Conrod Forged steel Bearings Needle bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 81/16 optional mount 2 Prop rearmost point excluding rear shaft 6/2 rear cover 3 Prop forwardmost point 1 magneto 4 Maximum extension thrust line 6-1/16 plug 61/4 5Vertical dimensions thrust linebehind prop aUp 6-1/16 plug 61/4 behind prop b Down 21/4 flywheel 11/2 behind prop 6 Horizontal extension thrust line 3 carb 31/4 7Propeller hub diameter 1-3/8 inhind prop Bolt hole pattern diameter 13/16 10-32 bolts 8 Propeller washer 1-3/8 diameter /4-In aluminum 9 Mounting bolt pattern 4 wide 21/2 high shaft centered hori zontally 3M edge vertically Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Typical chainsaw engine massive looking 2 Amount quality instructions Adequate easily understood 3Ease starting Good larger props Cold 5 10 flipsb Hot 2 3 flips 4 Ease mounting control hook-up Simple firewall mount optional mounting plate Rt-angie throttle linkage required 5 Ease carburetor adjustments Possible awkward en gine running 6 Vibration levels Good engine size 7 Cowiability Large flywheel carb mount will problems narrow cowls 8 Crankshaft bearing lateral play Noticeable excessive tern next surprise area vi bration get typical chainsaw shake low idle speeds high medium speeds relatively smooth Size wise closest engines can compare Roper 37 Titan 43 Hornet significantly smoother 37 quite smooth Titan compared power output got another surprise three engines same prop produced following thrust Hornet 42 365 lb Roper 37 275 lb Titan 43 315 lb Keep mind figures cannot compared directly since Roper Titan run different time weather warmer Hornet run fairly cool day difference can en tirely due different operating condi tions 7 lb 4 oz Hornet about two pounds heavier Roper 37 two pounds lighter Titan summary impressed Hornet need kind power have cowl room could useful engine Quadra Q50 Weve waiting long time engine got first production units tests time read will out use around country reactions somewhat mixedsort good news bad news situation Lets get bad news out way first especially isnt bad little disappointed power output expected see little out 3 cu engine Keep mind however engine far completely broken ran tests As get chance put running time it may improve Theres lot good news TML has pack aged 50% displacement very nearly same size weight original 2 cu Quadra Both engines fit Quadra cast aluminum mount cases will able pull out Q-35 put Q-50 its place Youll have balance out 1/4 lb increased weight youll have significant increase power avail able size about same lay out engines quite different ways thing Q-50 has side exhaust rather rear exhaust Q-35 carbs opposite sidesright side Q-35 left side Q-50 Q-50s needles easy get engine running throttle linkage straight shot things will have bearing whether can swap engines exisiing aircraft thing can help fact can rotate Q-50s cylinder 1800 puts carb back right-hand side makes needles little harder get Q-50 may never become quite standard Q-35 wel come addition Big Banger ranks Cobra several engines avail able Roush Mfg 23 co dis placement very close size Kioritz 24 also available Roush first question two engines es sentially same turns out situation sort like Chevrolet Cadil lac Although Cobra based Ze noah blower engine rather Kioritz very similar quite same quality however reflected price Roush feels market both engines Cobra isnt class Kioritz its still very well-made engine Its rear-mounted mechanical point system pre cludes use Superstarter en gine fairly easy start hand did find just like Hornet props got smaller starting got harder power output compared Kioritz bit lower Cobra also over pound lighter Cobra looks like good bet want something bit poop standard Quadra want keep cost down Quadra Q-35 have already made quite Continued page 134 44 Model Aviation HORNET ENGINE DATA Displacement 42 Cu Price $28995 Availability Direct Mfg American Power Prod Weight 7 ib 4 oz w/opt mt Converting Gb En gines Ignition has advantages such Savings cost fuel Less oily mess no Plugs burn out Use boats Cars Planes helicopters Can adapted Larger engines place Flywheel Thus saving weight No machine work volved needed screw driver drill Most available Gb en gines can converted features yours wirn new- en IILDtIL MARf K 2 CDITwo four cycles pointless system oints worry aboutTwins etc unit comes predrilled disk sensor formed clamp mounting t sensor engine Complete instructions convertion timing procedures cluded Unit operates 48 v Low current drain Weight 2 ozs size 2 x 2x 75 0 inches needed complete system Ignition coil spark plug andComplete system oni off switch available separately complete system fuel 5 ignition lines included No batteries includedl State engine size use ordering FABFIIONICSCash MO Certified Check plus $300 postage handling 1586 Via Riverapersonal checks take time clear Calif residents add tax San Lorenzo CA 94580 Brochure $1 00 refundable purchase RC Scale/Wischers Continued page 135 seems paper barely covered aluminum color powder appears plate itself onto doped surface very little effort indi vidual aluminum flakes laid flat max imum reflectivity especially helpful burnishing over rivets made dabs R/C-56 glue because rivets tend melt frictional heat rubbing too vigorous quantity aluminum powder substrate aluminum dope becomes less critical allowing greater latitude mix ing process preferred overcoat clear epoxy gloss hardener preserve metallic finish fingerprints fuel stains tarnishing main shortcoming type finish difficulty matching hues aluminum color after repair job Flutter Scale modelers aware excess speed results non-Scale appearance air seldom victims control surtace tlutter model never reaches speed could cause phenomenon occurs normal cruising speed quite possible look serious problems loose hinges pushrods torque rods operate movable surfaces Flut ter much likely occur during acro batic maneuvers speed builds point will cause surface act like flag stiff breeze Damage horns clev ises hinges control surfaces wreak havoc can usually hear control surface flut ter first sound heard vibrating buzz loud enough discerned clearly above exhaust propeller noises 50-50 chance second sound will caused destructing balsa model smites earth old faithful Ariel Sport ended its life means past summer en gine changed Webra Blackhead 60 HP 60 power better vertical performance per ceptible increase speed During 450 dive unexpected buzz heard From~jen Age 01 Aviation 22 i FAIRcHI1o control nel Kit #107 $395 099 15 EngInes 48 Wingspan Dealer & Dintribetor Inquiries Please send 509 Phone 753 273-9593 Flyline Catalog Flyline Models Inc PO Box 2136 Fairfax Virginia 22031 USA elevators became blur remains cremated After six years flying what could have caused Hard use abuse probably weakened slender aft end fuselage rapid succession snap rolls just prior flutter may also have weakened fuselage-to-stabilizer joint resulting flexibility combined unaccustomed higher speeds probably permitted flutter brought about models sudden demise could also have caused excessive elevator pushrod flexibility pushrod 116-in birch dowelwhich should have /4-in two other occasions have flut ter problems models both ailerons evident high speed dives model after loud vibratory roar lost aileron throttled quickly landed safely using remaining con trol diagnosed ailerons too thin built soft flexible balsa torque rods excessively long small diameter second model ailerons would buzz rather gently whenever speed built up wing aileron structure sufficiently strong avoid disaster annoying noise persisted until ailerons chords tapered /s-in narrower tips small change hardly noticeable appearance major wing overhaul install heavier torque rods averted control surfaces likely flutter ailerons using torque rods ailerons elude probability flutter increasing rod diameter 10-in-long torque rods deHavilland 71 Racer fabricated 9/tn-in OD aluminum tubing /4-in birch dowel epoxied pinned end As racer has subjected lot high-speed abuse no evidence aileron flutter Ailerons operated wire pushrods bellcrariks must have no free play system Long music wire pushrods within wing must supported frequent intervals fairleads can thin plywood plates cemented third fourth rib Supporting holes ply plates should slightly larger wire diameter Flutter problems elevators can often traced pushrods excessively h F Matched Performance System TOP PERFORMANCE K&$ tNGINtS Airplane 4 Marine K&$ FUELSSB GLOW PLUGS 7 tlendt4 choices Matched Finish System BEST APPEARANCE K&$ FIBtRGLASS CLOTH K&B Mrcro-$sllonns FILLtt 9$ SUPE$ POXY RESIN K&$ SUPER POSY THINNER t&$ SUPER POXY PRIMtR K&$ SUPER POSY PAINT K&B MIXING CUPS 138 Model Aviation IN STOCK FOR IMMEDIATE SHIPMENT New 30 CID QUADRA$20950 New 22 CEO QUADRA$10950 Rag 22 QUADRA $10450 Brisighella Flywheel $12450 Reg 22 QUADRA POWER ASSEMBLY ONLY 96450 QUADRA REPAtR 1000 plus parts Jint Manner ERCOUPEPLANS $2395 KIT $23995 Jim Messer TOMAHAWK PLANS $2395 KIT $25995 Jim Massarl-BALLTRAINER PLANS $1895 KIT $9995 BALSA BASSWOOD lou siesl 35% OFF Concept FLEET PLANS $2995 KiT $15995 COWL $1995 FLOATS 36115 scale cores $1795 complete kit $3995 FLOATS 49 h scalecoran $2195 complete kit $4795 Au CECONITE Products ionS OFF Sig J-3 CUB KIT $12496 PLANS SUPER STEARMAN lOodfreyl $2995 STARDUSTER TOO ii IBtisighellal J-3 CUB Nelit $2995 VOLKSPLANE Chicken Charliel $2395 COCKPIT KITS Tomahawk F4U-1 Spitfire $2295 Ercoupe $2095 Stearman 52295 Citehriu $2496 J-3 Cob $2195 ME-109 $2295 Fleet $2195 US Quadra FUEL TANKS1$ oz $695 32 oc $795 FIBERGLASS ARROW SHAFTS 5116 x 32 long 6/91000 24-Hour Sarsdce . Add $250 postage Send Bank Check Money Order JIM MESSERS QUALITY MODEL PRODUCTS 106 Valley View Dr Allogany NY 14706 flexible pushrod straight end end rigid Any bend pushrod introduces probability will flex permit softness system can precipitate flutter quick check force elevator trailing edge gently through its natural arc travel moves freely rotating servo output wheel look unwanted deflection pushrod system Enclosed nylon tubular rods should tied down intervals prevent deflection Balsa dowel rods should sufficiently rigid resist bending pressure applied elevator precisely what happens air loads occur high speed Bends wire ends pushrods wire exits through fuselage side elsewhere structure often result type flexibility can lead flutter should kept mind slowflying lightweight Scale model min imum power may never encounter flutter though possessing flaws mentioned Its fast high-powered heavy types likely vic tims can happen Scale model course regardless size usually initiated speed often diving can happen wing model having no ailerons structure flexible Tightly stretched covering material good preventative measure open-framework wings Covering tends sag hot humid weather can reduce wing rigidity enought permit flutter Wings full partial sheet-balsa covering immune problem Documentation sources Offering threeview drawings photo packs enlargements Scale plans models service Scale enthusiasts will search documenta tion drawings enlarge drawings up eight feet long Scale Plans Photo Service 3209 Madison Ave Greensboro NC 27403 Catalog $3 Scale model plan-finding service will lead publication printed wanted drawings within last 50 years Three-views model drawings listed service also has limited number model drawings Gleason Enterprises Rt 2 Box 125 Austin MN 55912 photo service listing over 130 aircraft types offering color photo packs en largements Catalog 50 Ken P Kalynuk 369 Moorgate St Winnipeg Manitoba Canada R3J 2L6 Bob Dolly Wiseher S-221 Lapham Peak Rd Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 49 liked Turnaround both flying judging However cant say liked same con ventional AMA Pattern much refer flying fast crisp quick conventionalpattern models though barely short being guided buzz bombs simply feel better regardless unre alistic may Thats probably because its experience lies RC Contest Board decides pass Turnaround 84 didntRMcM make mandatory classes wont end world may like change least right away Im getting pre pared First Id like thank Matt thoughtful letter has made valu able observations basis personal experience flying judging TurnContinued page 142 RIC MODEL TRANSPORTER Compact Versatile Durable Hauls 2 planes plus gear equipment will need $570 field customize inside hangers tool box etc meet eed cz S WINNERS Flat platinum coil element Ceramic core Idle Bar Idle cap January 1984 139 Great LakesPO Box 308 Tawas City Ml 48763 Model Company517362-6078 AT-6 SNJ-HARVARD Wingspan 63375 ngine y Fly List Price $28500 ory Direct $22800 Michigan residents add 4% sales tax Send SASE Brochure er Inaviries Welcome highly detailed eurathane foam kit also provides balsa wing sheeting rudder elevator ailerons detail molded ribs will show covered silkspan provided Numerous items shown photo provided such choice four different canopies scale struts len sos navigation landing & position & passing lights antenna pitot tube motor mount instrument panels necessary hardware except motor radio fuel tank Eurathane foam affected solvents such dope thinner lacquer thin ner glo fuel can painted almost type paint Coo Si 410030 HisS Maintnanc F. Alunonom ExtSnot Wood Coo Construction Stl itonnins Go, X-HAIJL ER PO Box 185 Constantine MI 49042 Ciil 616435-6905 Send S1 cataloque ox 31228 Indpls IN 46231 A