THOSE OF YOU have following thing bundled up coats gloves series may remember lead photos Part 1 big ear muffs useful ear warming back April issue showed us doing sound deadening first test b Beckman Kirby Crawford bi han ersfoi latest report intrepid team big engine testers installment look four popular Giant Scale engines interlude answer some questions submitted readers Part 4 runs made late November early December anyone thinks Virginia too far south get cold doesnt know about northern Virginia lead photo time shows Kirby trying function survive 4th July weekend same location reason mentioning empha size difference weather conditions between first test session fact other tests reported Parts 2 3 made earlier year conditions very similar first time session however temperature humidity 90s has affect engine performance dont try make direct comparisons earlier data did wind up rough idea effect different conditions Bobs Homelite 1 6 run during earlier sessions before variety props now available Dur ing earlier run cool weather engines best performance 16 lb thrust time around same prop Kolbo 20-5 produced 145 lb thrust decrease almost 10% reasonable assume engines will similarly affected differ ences due differing conditions cannot over emphasized please take adequately account reviewing results never intended make detailed comparisons performance different engines goal still try fill little gap infor mation about Big Bangers available have getting lot feedback about series happily positive have some good questions raised would like try answering comment hear often Static Kirby tweaks Evra during its break-in run Nothern Virginia weather July somewhat different thrust doesnt mean anything thing way November beginning projectreally counts performance air PropTZTZZD T ZDT Z T ZK T Engine16-416-516-616-616-818-618-618-618-818-818-818-1018-1020-520-6 Idle RPM2800280025002300230021002100210021002200210021002100 ETop RPM8400825075506600670069506700675069506000620067006000 Lb Thrust115121251251414121351375 1313514514 Idle RPM3100 2400 2900 3000 2500 2700 2700 2500 2500 2600 2300 2200 2800 2200 2700 RPM10800 9250 9200 8700 8150 6600 8000 7200 6650 6900 7150 5850 6150 6600 5950 Lb Thrust 125135135131412515145125141451275 1313514 Idle RPM 2300 2300 2300 2200 2100 2100 2100 2200 2100 2100 2100 2100 2100 2100 2100 Top RPM 9800 8950 9000 8800 8250 6800 7900 7300 7000 7100 7000 6200 6400 6900 6100 ILbThrust 10131351351413151551475 15141425 1451615 ho Idle RPMDDynathrustGGrish2200 2200 2200 2200 27002200 rTop RPMKKolboTTop FliteZZinger845086008950775080007650 iLb Thrust2021225222123 36 Model Aviation HOME LITE ENGINE DATA Displacement 16 Cu Supplier NAhomemade conversion Price NA Availability NA Mfg Homelite Original use Chainsaw Weight 3 lb 15 oz mount TEST DATA SUMMARY Max thrust 145 lb @ 6700 rpm Kolbo 20-5 prop 161 fuel mix @ 08 oz/min fuel consumption Accessories supplied Engine mount Homemade 3/32-in sheet alum Prop hub Homemade Recommended propeller Kolbo 20-5 Recommended fuel mix 161 Carburetor Make type Homeilte Waibro diaphragm pump Controls available Throttle choke Adjustments avail Idle set screw low-speed mixture Ignition Type Magneto mechanical points Spark plug Champion RCJ8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Grounding wire can added magneto Internal details Induction Reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Forged steel two pieces pressed together Bearings Caged needles front rear plus roller thrust bearing Conrod Stamped steel Bearings Rollerplain wrist pin Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firwall prop mount supplied 6-7/8 2 Prop rearmost point excluding rear shaft 5-1/8 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5 plug @ 5-1/8 behind prop 5 VertIcal dimensions thrust line a Up 5 plug @ 5-1/8 behind prop b Down 4 carb @ 3 behind prop 6 Horizontal extension thrust line 2 carb @ 3 behind prop 7 Propeller hub diameter 11/2 Bolt hore diameter NAsingle 5/16-24 bolt 8 Propeller washer 112 aluminum 9 MountIng bolt pattern NA Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat compact except radial extension intake 2Amount quality instructions NA 3Ease starting Cold GoodiS 20 flips b Hot GoodS 10 flips 4 Ease mounting control hook-up Radial mounting easily made straight throttle hook-up 5 Ease carburetor adjustments Difficult engine running 6 Vibration levels Fairly low better chainsaw-derived engines 7 Cowlability In-line-type cowls difficult because carb position 8 Crankshaft bearing slop Very noticeable agree second half first part Granted performance air really bottom line Peak performance air depends proper combination air frame engine propeller static thrust tests ground wont tell optimum combina tion thing finds building plane installing engine putting prop flying try different props different trim and/or balance airframe until get what want what engine cant hack What find engine would go cowl will just barely fly labor love spent year have got much power weight nose its bear fly answer change engine isnt quite simple changing prop can has done weve heard lot horror stories makes sense start out engine reasonable fit power requirements some Giant Scale modelers dont necessarily include ourselves no problem pick engine will ball park aircraft being modeled vast majority us however would nice have some reasonably simpleway judge capabilities various engines available match requirements kind data around would never have embarked what has turned out time-consuming exhaust ing fascinating project Once started static thrust reasonably simple way measure engine capability Before series done will give thoughts match specific requirements Another point has brought up know pitch prop really what manufacturer says answer that dont know really dont care dont think average modeler cares Again performance counts prop does job dont really care what exact pitch No manufacturer deliberately going carve label prop improperly say differences props cannot exist supposed same Wood stable raw material world density grain manufacturing tolerances can result variations prop next Wood raw material props nowadays molded glass-filled plastic props can have similar variations reason have used prop given make size tests since primarily looking engines props Someday may take look props see much vary since thing modeler really needs consis tency As long 20-8 prop given make same cares pitch eight inches eight-and-a-half inches subject props reader suggested should use props readily available modelers reference course Kolbo Korp prop has used tests prop few hand started whole thing size 20-5 selected Kirby several years ago set up first lIomelite engine has proven successful prop Kirbys Mr Mulligan Gulfhawk both using Homelite engine included testing just because Z D T Z D T Z G T ZTZ G Z GProp 20-620-820-820-820-1020-1020-1020-1222-622-622-822-822-1022-1022-12 ne 2100210021002200230023002300230024002400Idle RPMi 6550600055005500495048005250520057004500Top RPM 137514135131225 1213513514612LbThrust 25002400 2600Idle RPM 5700 59005000 5300Top RPM 251112Lb Thrust 2200 22002000 2000 2200 1900 2000 2000 2000 2000 2000 2000 2000 2000 2000 Idle RPMI 6900 61505700 5800 5300 5300 5500 4700 5500 5800 4950 5350 4500 4500 3200 Top RPM 1514515151451451475 12515145151512148Lb Thrust 23002200 2300 2100 2000Idle RPM 8350 74006950 7000 6500 6550Top RPM 4t 2422252325 2225 2222Lb Thrust ber1981 37 Homelite purrs away itsfuel consumption run Its eventual home will Sparrowhawk Bob ever finishes plane it has turned out better performers engines Granted readily available hobby shops fact may no longer available other hand obviously has something going it might pay off look After never looked used anything wasnt readily available everyone flying models would still small arrows use mufflers another subject keeps coming up As pointed out last installment since didnt have mufflers engines decided make runs Three current engines came mufflers looked like good time get some idea what effect Husky has small stamped steel muffler assembly part original chainsaw installation After completed other tests made two additional runs same prop First ran muffler made sure engine peaked Out put muffler re-tuned engine noticeable effect improvement engines idling top end however dropped about 100 rpm lost almost pound thrust Hustler Evra have similar mufflers made B&B Specialties mufflers have fairly large rectangular expansion chambers two good-sized tubular stacks unable run Hustler its muffler did run Evra described above Husky same improvement idle observed time high end engine picked up 200 rpm solid pound thrust Obviously smaller model engines right amount back pressure can actually increase engines output too much will rob power didnt try judge noise reduction wish thank following firms assistance part Big Bangers project Dynathrust Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 EWH Specialties Inc 3012 Avenue E East Arlington TX 76011 Super Hustler Mk II Giezendanner USA PO Box 818 Pottstown PA 19464 Grish Bros St John IN 46373 Hobby Lobby International 1 Franklin Pike Circle Brentwood TN 37027 Evra J&Z Products 25029 5 Vermont Ave Harbor City CA 90710 Zinger JC Enterprises 2251 SW 28th Terrace Ft Continued page 115 Accessories supplied Engine mount No available Prop hub YesMuffler No available Other Pull start cord pulley Additional items required excluding prop fuel tank None Recommended propeller specifIed Recommended fuel mix 201 Carburetor Make type Walbrodiaphragm pump Controls available Throttle Adjustments avail Idle set screw high low mixture Ignition Type Magnetoelectronic Spark plug Champion DJ-8J Recommended gap 0025 Magneto gap 0015 Point gap NA Kill disable system Grounding lug magneto Internal details Induction Rear reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Model engine style laminated counter-weight Bearings Two sealed ball bearings Conrod Twopiece stamped assembly Bearings Caged roller bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 7 2 Prop rearmost point excluding rear shaft 6-5/8 carb 3 Prop forwardmost point 11/16 magneto 4 Maximum extension thrust line 5-9/16 plug behind Drop 5 Vertical dimensions thrust line a Up 5-9/16 plug @ 33/4 behind prop b Down 1f4 flywheel @ 1 behind prop 6 Horizontal extension thrust line 1/4 flywheel @ 1 behind prop 7 Propeller hub diameter 11/2 Bolt hole diameter NAsingle 3/8-16 stud 8 Propeller washer 11/2 aluminum starter pulley 9 Mounting bolt pattern 2-5/8 sq centered thrust line Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Very compactlooks like oversize model eng 2 Amount quality instructions Very goodcovers needed info modelers viewpoint 3 Ease starting See notes 4 Ease mounting control hook-up Radial mountstraightfor ward throttle hook-up 5 Ease carburetor adjustments idle screw almost Inaccessible mixture easy 6 Vibration levels Extremely smooth speeds 7 Cowiability Excellent requires deep firewall 8 Crankshaft bearing slop None detectable 38 Model Aviation its battery ignition module strapped fuel tank test runs shaft extension just behind prop added facilitate prop changes during testing HUBBY LUBBY/EVHA 190 ENGINE DATA Displacement 19 Cu Ifl Supplier Hobby Lobby Intl Price $7900 Mount $19 Muf 1 Franklin Pike CIrclefler $1995 Brentwood TN 37027Avatlabllity Direct Mfg Piston Powered Products Original use Lawnboy weed whip Weight 4 lb 9 oz w/mt & muf TEST DATA SUMMARY Max thrust 15 lb @ 5700 rpm Zinger 206 prop 201 fuel mix @ 08 oz/min fuel consumption Dieter Schiuter world famous helicopter designer presents new MinI-5y & Super MIniBoy Show Seration Toledo & Macs Features 25 40 convertible Cyclone fan cooling No heat sinks needed Spinner starting Shaft drive tail rotor Factory researched & developed ChoIpof Rapping hinges Seepav Collective heads Rock table yet fully aerobatic World fv~ois Schluter quality Noi Ccl le9tIve 19995 CollectIve 22995 parts stock World standard metrics sob dealer order direct train UNSEAM Inc 2594 subsidiary MINIATURE AIRCRAFT North Orange Blossom Trail ndo FL 32804 Phone 30514221531 plans using small nails brads hold place dry Since bends gentle laminations will form quite easily After adding ribs wing add upper 1/4 square spar spar laminated two strips alsa Although wing assembled flat bench top spar does bend downward toward tips Wet both pieces water place lamination rib notches glue top lamination sure install 3/32 vertical grain spar webs shown plans add considerable strength wing tail surfaces built up p balsa t balsa tip segments After adding dihedral wing sheeting center section 1/16 sheet balsa can return fuselage complete wing saddle Glue 1/32 ply wing rest fuselage wing place provide proper shape Trim fuselage sheeting necessary get good wing-to-saddle fit Finally add heavy paper 1/16 balsa sheet wing fillet between fuselage ply saddle Dont use usual epoxy putty resin microballoons filletsthis materials too heavy Covering finishing Since trying make everything light possible best way go Super MonoKote similar lightweight covering bottom wing tail fuselage covered flat Dove Gray top plane covered flat Olive Drab upper surfaces camouflaged coat flat tan light earth enamel epoxy Suitable paints include Pactra Military Flats spray can RS Perfect Paint K&B Hobbypoxy Before spraying wipe surface MonoKote thinner acetone remove trace grease oil After camouflage pattern has painted mask spray roundels numbers use masking tape masking markings remove tape adjacent colors will probably lifted off made stencils newspaper just wet paper slide wet stencil place spray Simple worked fine Miscellaneous strnctural details standard called out plan such landing gear mounting blocks wing hold-on dowel nylon bolt nose cowl can built up balsa blocks sheet can make fiberglass keep light vacuum-form out sheet plastic Light cardboard landing gear covers attached landing gear legs silicone glue add final touch ready fly Flying Notes Before flying make sure CG right place wing has no warps wing big dont want slightest warp Reheating covering twisting offending surface simple cure advisable make some fast taxi tests before flight will help get feel airplane before first takeoff Begin takeoff rnn holding up elevator prevent nose-over throttle gunned As soon some speed built up relax neutral plane may fly off itself may require slight bit up elevator help rotation good duration Astro 15 dont indulge steep turns altitude-losing maneu vers Gentle wide turns will retain altitude give maximum flight time taxiing position back pits on-off switch used necessary very effective have motor servo set up full power forward throttle control halfway back gives cruise power full back stick shuts off motor Flying Spitfire beautiful experience Its unique mixture Scale Soaring RC Free Flight Dont look usual gas model performance though wish tear up skies better off usual noisy greasy bombs Im knocking kind flying mind since much RC fun fits category lightly-loaded Scale electric stuff new refreshing change pace dont forget ship also does nice relaxed job sport flying glow engine scale realism something like scale speed appreciated either case sport Spit calm summer evening something behold can build light youll love Big Bangers/BeckmanCrawford Continued page 38 Lauderdale FL 33312 Husky Top Flite Models Inc. l9JI Narragansett Ave Chicago IL 60639 Now lets get notes subjective com ments about four engines tested time Homelite 16 engine currently available directly usable form fairly easy convert several use around country have inquiries about itsince Kirby both use As far Continued page 118 October1981 115 IN 81 ITS RICKS R/C MODELS % INTRODUCING THE RICK STICK SUPREMETHE WEEKENDER FLITE BOX SPORTTRAINER- FULLYAEROBATICSIZE 124 x 12 x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 40 $4995 Pm-Cut Kit Hardware Landing Gear Full Length wood mdSPACE FOR 15 Drawer Cabinet 1-Gal Fuel Pre-Built Ready Fine Sand & Cover Battery Fuel Pump Power Panel Full Length Balsa Wood & Spruce SparsProp Bin Tool Tray Electric Hinged Surfaces Hardware HalIco GearStarter Cleaner Towels Nylon Bolts Tapped Bolt Gear&WingNo Other Like Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ICECKOavtO3OO Handling RIcws 1RODELS INC FL 33515I Kins Super coat Priner spray can$ 3 95 Point ThinnerS 4 95 Point Filters$ 1 49 Engine Oil$ 1 50 Engine Oil Kit519 00 Engine Rebuilding dleanrng Storage & Maintenance Kt$ 5 95 Kleen craay$ 1 95 Dust Masks$ 1 49 Send SASE fore 2 Box 481EIf avail FREE CatalogN-CRAFT As hand KY 41101yourlocalhobbyshop Dealers Invited i6O6i928-4763 order direct KY res add 5% sales tax AVIATION FILM CLASSICS ON VIDEOTAPE START YOUR OWN COLLECTION SF AVIATION FILRO ON EASY TO USE INEUPENOISE TIDEOCASOETTES ASIATION FILRS OF ALL TYPES FEATURES WAR DOCOPIENTARIES NEWSREEL ETC NOW ASAILABLE SN SlOES TAPESENT $1 00 FOR CATALSA UDS 1021J NSEPULVEDA MANHATTAS BCH CA 00256 Fiberglass Materials 5squareyards Choice oz cloth 12 Hour Epoxy Resin01500 per qt Mold ReleaseS3OO 16 02 Epoxy Primer K&BI03000 per gal Epoxy PaintThinner IK&BI01000 per gal Calitornia Residents add 6% Sales Tao Check Money Order onlySorry No COOs Bob Smith RIC Aircraft PO Box 33335 Granada Hills CA 91344 know Kirby did first conversion small chainsaw engine about four years ago bought chainsaw sale removed discarded saw parts cut away unneeded parts castiggs made prop adapter turned down flywheel fins business first engine went Nosen Mr Mulligan has flying beautifully three years has also flown Kirbys 28-lb Gulfhawk engine reported converted Bob use F9C-2 Sparrowhawk engine purchased local Homelite service center $6500 July August 1978 milling machine lathe used conversion work abso lutely necessary excess crankcase casting can cut away hacksaw file Kirby did turned out own prop adapters units available use Quadra will fit Homelite fins can left flywheel small weight penalty engine good size some smaller Giant Scale designs has proven realiable rugged power plant diffi cult cowl anything radial engine design intake manifold extending angle oppo site cylinder makes almost impossible get engine inline flat engine type cowls Note applications far have radials Kirbys 28-lb GulThawk far beyond what now consider reasonable engine size aircraft underpowered does fly little Homelite pulls through very realistic aerobatics Hobby Lobby/Evra 190 19 Cu engine has lot significant differences engines have worked up now has available three four years introduced fairly early continuing swell interest Giant Scale represents merging model airplane small engine techniques opinion has received less attention modelers truly deserves people Hobby Lobby took cylinder piston flywheel ignition system weed whip engine designed model-engine-type crankcase crankshaft complete mas sive ball bearings support shaft Walbro diaphragm pump carburetor mounted crankcase rear cover reed valve control induction result engine looks ways like larger version engines modelers have used years retains carburetor self-contained ignition have proven literally millions small gasoline engines crankcase design belongs Hobby Lobby engines manufac tured Piston Powered Products company makes original engine An electronic ignition system used engine starts easily once realize allow important factor engine must turning over approximately 400 rpm before ignition system will generate spark possible hand difficult point really clarified informa tion supplied early models engine current engines include starter pull rope pulley built prop washer tests used both pull rope Sullivan electric starter engine started immediately using either method never got pop out flipping hand Once pa t starting characteristics engine thee several items interestsome good some bad nicest things about Evra its in-line layout past weve talked about nice have engine no wider flywheel certainly tbe Evras case accomplished putting magneto right front cylinder intake rear crankcase cover course leads worst things about engine look data sheets youll find %-in between carburetor firewall carb does have built-in choke outin-the open test stand mounting hard properly choke engine built-in remotely operable choke would valuable addition engine As near could tell Evra never run briefly Most engines have worked have shown signs least short test runs decided give extra tankful break-in tendency heat up during operations indications like several other engines will need fair amount running really reach its peak ito low vibration easily cowled shape Evra should good engine lighter Giant Scale models especially original used flat in-line engine Husky 20 covered 23 Husky previous report isnt much say about slightly smaller one easily-cowled engines especially oiler pump removed other hand pump could very useful smoke system have room struck fairly flat power curve engine Husky 20 well made engine company very good reputation small engine field should able handle aircraft designed Quadra 118 Model Aviation will easier get some Super Hustler Mk II another engine has available some time test engine latest version understand significant differences ignition system have no personal experience earlier model cannot compare two Hustler significantly different Big Bangers Instead magneto uses onboard battery coil generate spark timing provided Hall Effect sensor electronic amplifier arrangement results cleaner looking engine since usual flywheel magneto coil gone carb front cylinder Hustler easily-cowled engine other hand ignition system requires relative myriad wires attendant increased probability failure test runs cut short problems couldnt straigtened out field First crimped-on battery connectors came off managed locate problem effect temporary fix Later engine began run rough refused start found lead soldered ground lug broken took care still no spark finally decided put off further attempts until could sort things Out As result did get some larger props have fuel consumption figures covered range props including recommended 20-8 figures show peak Zinger 20-6 will add data can collect Like Evra Hustler appears effort produce Big Banger configura tion closer what modelers have come expect certainly accomplishes wonder its worth added complication ignition system Schneider Races/Berliner Continued page 44 never have happened Lady Houston come forth contribution $500000 government refused foot bill Happily two S6B built John Boothman pilot # s-is 95 roared around course amazement thousands lined shores majestic demonstration aeronautics raised stature British aircraft industry its highest points wasnt very good racing Soon after race G H Stainforth became first person fly officially faster 400 mph set yet another Absolute World Speed Record time 4088 mph same S6B greastest seaplane raceand maybe greatest air racewas over Too bad French preparing several machines 1933 Schneider including pair Bernard Racers new 2000-hp Lorraine Radium engine Italians working bugs out sensational Macchi-Castoldi MC72 its tandem engines counterrotating propellers would later set 3-km speed record 441 mph still stands honor pilot Francesco Agello Though cheers soon died out lessons remained great mind Supermarine designer Mitchell came 1936 first thousands Spitfires Napier Lions Rolls Royce R engines came Merlin Curtiss D- 12 came Allison V-i 710 P-38 P-39 P-40 early P-Si ever-cleaner racers came flood knowledge about make airplanes go faster Isnt what air racing October1981 119 F4t ISpn~-~et3M331494a
Edition: Model Aviation - 1981/10
Page Numbers: 36, 37, 38, 115, 118, 119
THOSE OF YOU have following thing bundled up coats gloves series may remember lead photos Part 1 big ear muffs useful ear warming back April issue showed us doing sound deadening first test b Beckman Kirby Crawford bi han ersfoi latest report intrepid team big engine testers installment look four popular Giant Scale engines interlude answer some questions submitted readers Part 4 runs made late November early December anyone thinks Virginia too far south get cold doesnt know about northern Virginia lead photo time shows Kirby trying function survive 4th July weekend same location reason mentioning empha size difference weather conditions between first test session fact other tests reported Parts 2 3 made earlier year conditions very similar first time session however temperature humidity 90s has affect engine performance dont try make direct comparisons earlier data did wind up rough idea effect different conditions Bobs Homelite 1 6 run during earlier sessions before variety props now available Dur ing earlier run cool weather engines best performance 16 lb thrust time around same prop Kolbo 20-5 produced 145 lb thrust decrease almost 10% reasonable assume engines will similarly affected differ ences due differing conditions cannot over emphasized please take adequately account reviewing results never intended make detailed comparisons performance different engines goal still try fill little gap infor mation about Big Bangers available have getting lot feedback about series happily positive have some good questions raised would like try answering comment hear often Static Kirby tweaks Evra during its break-in run Nothern Virginia weather July somewhat different thrust doesnt mean anything thing way November beginning projectreally counts performance air PropTZTZZD T ZDT Z T ZK T Engine16-416-516-616-616-818-618-618-618-818-818-818-1018-1020-520-6 Idle RPM2800280025002300230021002100210021002200210021002100 ETop RPM8400825075506600670069506700675069506000620067006000 Lb Thrust115121251251414121351375 1313514514 Idle RPM3100 2400 2900 3000 2500 2700 2700 2500 2500 2600 2300 2200 2800 2200 2700 RPM10800 9250 9200 8700 8150 6600 8000 7200 6650 6900 7150 5850 6150 6600 5950 Lb Thrust 125135135131412515145125141451275 1313514 Idle RPM 2300 2300 2300 2200 2100 2100 2100 2200 2100 2100 2100 2100 2100 2100 2100 Top RPM 9800 8950 9000 8800 8250 6800 7900 7300 7000 7100 7000 6200 6400 6900 6100 ILbThrust 10131351351413151551475 15141425 1451615 ho Idle RPMDDynathrustGGrish2200 2200 2200 2200 27002200 rTop RPMKKolboTTop FliteZZinger845086008950775080007650 iLb Thrust2021225222123 36 Model Aviation HOME LITE ENGINE DATA Displacement 16 Cu Supplier NAhomemade conversion Price NA Availability NA Mfg Homelite Original use Chainsaw Weight 3 lb 15 oz mount TEST DATA SUMMARY Max thrust 145 lb @ 6700 rpm Kolbo 20-5 prop 161 fuel mix @ 08 oz/min fuel consumption Accessories supplied Engine mount Homemade 3/32-in sheet alum Prop hub Homemade Recommended propeller Kolbo 20-5 Recommended fuel mix 161 Carburetor Make type Homeilte Waibro diaphragm pump Controls available Throttle choke Adjustments avail Idle set screw low-speed mixture Ignition Type Magneto mechanical points Spark plug Champion RCJ8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Grounding wire can added magneto Internal details Induction Reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Forged steel two pieces pressed together Bearings Caged needles front rear plus roller thrust bearing Conrod Stamped steel Bearings Rollerplain wrist pin Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firwall prop mount supplied 6-7/8 2 Prop rearmost point excluding rear shaft 5-1/8 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5 plug @ 5-1/8 behind prop 5 VertIcal dimensions thrust line a Up 5 plug @ 5-1/8 behind prop b Down 4 carb @ 3 behind prop 6 Horizontal extension thrust line 2 carb @ 3 behind prop 7 Propeller hub diameter 11/2 Bolt hore diameter NAsingle 5/16-24 bolt 8 Propeller washer 112 aluminum 9 MountIng bolt pattern NA Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat compact except radial extension intake 2Amount quality instructions NA 3Ease starting Cold GoodiS 20 flips b Hot GoodS 10 flips 4 Ease mounting control hook-up Radial mounting easily made straight throttle hook-up 5 Ease carburetor adjustments Difficult engine running 6 Vibration levels Fairly low better chainsaw-derived engines 7 Cowlability In-line-type cowls difficult because carb position 8 Crankshaft bearing slop Very noticeable agree second half first part Granted performance air really bottom line Peak performance air depends proper combination air frame engine propeller static thrust tests ground wont tell optimum combina tion thing finds building plane installing engine putting prop flying try different props different trim and/or balance airframe until get what want what engine cant hack What find engine would go cowl will just barely fly labor love spent year have got much power weight nose its bear fly answer change engine isnt quite simple changing prop can has done weve heard lot horror stories makes sense start out engine reasonable fit power requirements some Giant Scale modelers dont necessarily include ourselves no problem pick engine will ball park aircraft being modeled vast majority us however would nice have some reasonably simpleway judge capabilities various engines available match requirements kind data around would never have embarked what has turned out time-consuming exhaust ing fascinating project Once started static thrust reasonably simple way measure engine capability Before series done will give thoughts match specific requirements Another point has brought up know pitch prop really what manufacturer says answer that dont know really dont care dont think average modeler cares Again performance counts prop does job dont really care what exact pitch No manufacturer deliberately going carve label prop improperly say differences props cannot exist supposed same Wood stable raw material world density grain manufacturing tolerances can result variations prop next Wood raw material props nowadays molded glass-filled plastic props can have similar variations reason have used prop given make size tests since primarily looking engines props Someday may take look props see much vary since thing modeler really needs consis tency As long 20-8 prop given make same cares pitch eight inches eight-and-a-half inches subject props reader suggested should use props readily available modelers reference course Kolbo Korp prop has used tests prop few hand started whole thing size 20-5 selected Kirby several years ago set up first lIomelite engine has proven successful prop Kirbys Mr Mulligan Gulfhawk both using Homelite engine included testing just because Z D T Z D T Z G T ZTZ G Z GProp 20-620-820-820-820-1020-1020-1020-1222-622-622-822-822-1022-1022-12 ne 2100210021002200230023002300230024002400Idle RPMi 6550600055005500495048005250520057004500Top RPM 137514135131225 1213513514612LbThrust 25002400 2600Idle RPM 5700 59005000 5300Top RPM 251112Lb Thrust 2200 22002000 2000 2200 1900 2000 2000 2000 2000 2000 2000 2000 2000 2000 Idle RPMI 6900 61505700 5800 5300 5300 5500 4700 5500 5800 4950 5350 4500 4500 3200 Top RPM 1514515151451451475 12515145151512148Lb Thrust 23002200 2300 2100 2000Idle RPM 8350 74006950 7000 6500 6550Top RPM 4t 2422252325 2225 2222Lb Thrust ber1981 37 Homelite purrs away itsfuel consumption run Its eventual home will Sparrowhawk Bob ever finishes plane it has turned out better performers engines Granted readily available hobby shops fact may no longer available other hand obviously has something going it might pay off look After never looked used anything wasnt readily available everyone flying models would still small arrows use mufflers another subject keeps coming up As pointed out last installment since didnt have mufflers engines decided make runs Three current engines came mufflers looked like good time get some idea what effect Husky has small stamped steel muffler assembly part original chainsaw installation After completed other tests made two additional runs same prop First ran muffler made sure engine peaked Out put muffler re-tuned engine noticeable effect improvement engines idling top end however dropped about 100 rpm lost almost pound thrust Hustler Evra have similar mufflers made B&B Specialties mufflers have fairly large rectangular expansion chambers two good-sized tubular stacks unable run Hustler its muffler did run Evra described above Husky same improvement idle observed time high end engine picked up 200 rpm solid pound thrust Obviously smaller model engines right amount back pressure can actually increase engines output too much will rob power didnt try judge noise reduction wish thank following firms assistance part Big Bangers project Dynathrust Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 EWH Specialties Inc 3012 Avenue E East Arlington TX 76011 Super Hustler Mk II Giezendanner USA PO Box 818 Pottstown PA 19464 Grish Bros St John IN 46373 Hobby Lobby International 1 Franklin Pike Circle Brentwood TN 37027 Evra J&Z Products 25029 5 Vermont Ave Harbor City CA 90710 Zinger JC Enterprises 2251 SW 28th Terrace Ft Continued page 115 Accessories supplied Engine mount No available Prop hub YesMuffler No available Other Pull start cord pulley Additional items required excluding prop fuel tank None Recommended propeller specifIed Recommended fuel mix 201 Carburetor Make type Walbrodiaphragm pump Controls available Throttle Adjustments avail Idle set screw high low mixture Ignition Type Magnetoelectronic Spark plug Champion DJ-8J Recommended gap 0025 Magneto gap 0015 Point gap NA Kill disable system Grounding lug magneto Internal details Induction Rear reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Model engine style laminated counter-weight Bearings Two sealed ball bearings Conrod Twopiece stamped assembly Bearings Caged roller bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 7 2 Prop rearmost point excluding rear shaft 6-5/8 carb 3 Prop forwardmost point 11/16 magneto 4 Maximum extension thrust line 5-9/16 plug behind Drop 5 Vertical dimensions thrust line a Up 5-9/16 plug @ 33/4 behind prop b Down 1f4 flywheel @ 1 behind prop 6 Horizontal extension thrust line 1/4 flywheel @ 1 behind prop 7 Propeller hub diameter 11/2 Bolt hole diameter NAsingle 3/8-16 stud 8 Propeller washer 11/2 aluminum starter pulley 9 Mounting bolt pattern 2-5/8 sq centered thrust line Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Very compactlooks like oversize model eng 2 Amount quality instructions Very goodcovers needed info modelers viewpoint 3 Ease starting See notes 4 Ease mounting control hook-up Radial mountstraightfor ward throttle hook-up 5 Ease carburetor adjustments idle screw almost Inaccessible mixture easy 6 Vibration levels Extremely smooth speeds 7 Cowiability Excellent requires deep firewall 8 Crankshaft bearing slop None detectable 38 Model Aviation its battery ignition module strapped fuel tank test runs shaft extension just behind prop added facilitate prop changes during testing HUBBY LUBBY/EVHA 190 ENGINE DATA Displacement 19 Cu Ifl Supplier Hobby Lobby Intl Price $7900 Mount $19 Muf 1 Franklin Pike CIrclefler $1995 Brentwood TN 37027Avatlabllity Direct Mfg Piston Powered Products Original use Lawnboy weed whip Weight 4 lb 9 oz w/mt & muf TEST DATA SUMMARY Max thrust 15 lb @ 5700 rpm Zinger 206 prop 201 fuel mix @ 08 oz/min fuel consumption Dieter Schiuter world famous helicopter designer presents new MinI-5y & Super MIniBoy Show Seration Toledo & Macs Features 25 40 convertible Cyclone fan cooling No heat sinks needed Spinner starting Shaft drive tail rotor Factory researched & developed ChoIpof Rapping hinges Seepav Collective heads Rock table yet fully aerobatic World fv~ois Schluter quality Noi Ccl le9tIve 19995 CollectIve 22995 parts stock World standard metrics sob dealer order direct train UNSEAM Inc 2594 subsidiary MINIATURE AIRCRAFT North Orange Blossom Trail ndo FL 32804 Phone 30514221531 plans using small nails brads hold place dry Since bends gentle laminations will form quite easily After adding ribs wing add upper 1/4 square spar spar laminated two strips alsa Although wing assembled flat bench top spar does bend downward toward tips Wet both pieces water place lamination rib notches glue top lamination sure install 3/32 vertical grain spar webs shown plans add considerable strength wing tail surfaces built up p balsa t balsa tip segments After adding dihedral wing sheeting center section 1/16 sheet balsa can return fuselage complete wing saddle Glue 1/32 ply wing rest fuselage wing place provide proper shape Trim fuselage sheeting necessary get good wing-to-saddle fit Finally add heavy paper 1/16 balsa sheet wing fillet between fuselage ply saddle Dont use usual epoxy putty resin microballoons filletsthis materials too heavy Covering finishing Since trying make everything light possible best way go Super MonoKote similar lightweight covering bottom wing tail fuselage covered flat Dove Gray top plane covered flat Olive Drab upper surfaces camouflaged coat flat tan light earth enamel epoxy Suitable paints include Pactra Military Flats spray can RS Perfect Paint K&B Hobbypoxy Before spraying wipe surface MonoKote thinner acetone remove trace grease oil After camouflage pattern has painted mask spray roundels numbers use masking tape masking markings remove tape adjacent colors will probably lifted off made stencils newspaper just wet paper slide wet stencil place spray Simple worked fine Miscellaneous strnctural details standard called out plan such landing gear mounting blocks wing hold-on dowel nylon bolt nose cowl can built up balsa blocks sheet can make fiberglass keep light vacuum-form out sheet plastic Light cardboard landing gear covers attached landing gear legs silicone glue add final touch ready fly Flying Notes Before flying make sure CG right place wing has no warps wing big dont want slightest warp Reheating covering twisting offending surface simple cure advisable make some fast taxi tests before flight will help get feel airplane before first takeoff Begin takeoff rnn holding up elevator prevent nose-over throttle gunned As soon some speed built up relax neutral plane may fly off itself may require slight bit up elevator help rotation good duration Astro 15 dont indulge steep turns altitude-losing maneu vers Gentle wide turns will retain altitude give maximum flight time taxiing position back pits on-off switch used necessary very effective have motor servo set up full power forward throttle control halfway back gives cruise power full back stick shuts off motor Flying Spitfire beautiful experience Its unique mixture Scale Soaring RC Free Flight Dont look usual gas model performance though wish tear up skies better off usual noisy greasy bombs Im knocking kind flying mind since much RC fun fits category lightly-loaded Scale electric stuff new refreshing change pace dont forget ship also does nice relaxed job sport flying glow engine scale realism something like scale speed appreciated either case sport Spit calm summer evening something behold can build light youll love Big Bangers/BeckmanCrawford Continued page 38 Lauderdale FL 33312 Husky Top Flite Models Inc. l9JI Narragansett Ave Chicago IL 60639 Now lets get notes subjective com ments about four engines tested time Homelite 16 engine currently available directly usable form fairly easy convert several use around country have inquiries about itsince Kirby both use As far Continued page 118 October1981 115 IN 81 ITS RICKS R/C MODELS % INTRODUCING THE RICK STICK SUPREMETHE WEEKENDER FLITE BOX SPORTTRAINER- FULLYAEROBATICSIZE 124 x 12 x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 40 $4995 Pm-Cut Kit Hardware Landing Gear Full Length wood mdSPACE FOR 15 Drawer Cabinet 1-Gal Fuel Pre-Built Ready Fine Sand & Cover Battery Fuel Pump Power Panel Full Length Balsa Wood & Spruce SparsProp Bin Tool Tray Electric Hinged Surfaces Hardware HalIco GearStarter Cleaner Towels Nylon Bolts Tapped Bolt Gear&WingNo Other Like Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ICECKOavtO3OO Handling RIcws 1RODELS INC FL 33515I Kins Super coat Priner spray can$ 3 95 Point ThinnerS 4 95 Point Filters$ 1 49 Engine Oil$ 1 50 Engine Oil Kit519 00 Engine Rebuilding dleanrng Storage & Maintenance Kt$ 5 95 Kleen craay$ 1 95 Dust Masks$ 1 49 Send SASE fore 2 Box 481EIf avail FREE CatalogN-CRAFT As hand KY 41101yourlocalhobbyshop Dealers Invited i6O6i928-4763 order direct KY res add 5% sales tax AVIATION FILM CLASSICS ON VIDEOTAPE START YOUR OWN COLLECTION SF AVIATION FILRO ON EASY TO USE INEUPENOISE TIDEOCASOETTES ASIATION FILRS OF ALL TYPES FEATURES WAR DOCOPIENTARIES NEWSREEL ETC NOW ASAILABLE SN SlOES TAPESENT $1 00 FOR CATALSA UDS 1021J NSEPULVEDA MANHATTAS BCH CA 00256 Fiberglass Materials 5squareyards Choice oz cloth 12 Hour Epoxy Resin01500 per qt Mold ReleaseS3OO 16 02 Epoxy Primer K&BI03000 per gal Epoxy PaintThinner IK&BI01000 per gal Calitornia Residents add 6% Sales Tao Check Money Order onlySorry No COOs Bob Smith RIC Aircraft PO Box 33335 Granada Hills CA 91344 know Kirby did first conversion small chainsaw engine about four years ago bought chainsaw sale removed discarded saw parts cut away unneeded parts castiggs made prop adapter turned down flywheel fins business first engine went Nosen Mr Mulligan has flying beautifully three years has also flown Kirbys 28-lb Gulfhawk engine reported converted Bob use F9C-2 Sparrowhawk engine purchased local Homelite service center $6500 July August 1978 milling machine lathe used conversion work abso lutely necessary excess crankcase casting can cut away hacksaw file Kirby did turned out own prop adapters units available use Quadra will fit Homelite fins can left flywheel small weight penalty engine good size some smaller Giant Scale designs has proven realiable rugged power plant diffi cult cowl anything radial engine design intake manifold extending angle oppo site cylinder makes almost impossible get engine inline flat engine type cowls Note applications far have radials Kirbys 28-lb GulThawk far beyond what now consider reasonable engine size aircraft underpowered does fly little Homelite pulls through very realistic aerobatics Hobby Lobby/Evra 190 19 Cu engine has lot significant differences engines have worked up now has available three four years introduced fairly early continuing swell interest Giant Scale represents merging model airplane small engine techniques opinion has received less attention modelers truly deserves people Hobby Lobby took cylinder piston flywheel ignition system weed whip engine designed model-engine-type crankcase crankshaft complete mas sive ball bearings support shaft Walbro diaphragm pump carburetor mounted crankcase rear cover reed valve control induction result engine looks ways like larger version engines modelers have used years retains carburetor self-contained ignition have proven literally millions small gasoline engines crankcase design belongs Hobby Lobby engines manufac tured Piston Powered Products company makes original engine An electronic ignition system used engine starts easily once realize allow important factor engine must turning over approximately 400 rpm before ignition system will generate spark possible hand difficult point really clarified informa tion supplied early models engine current engines include starter pull rope pulley built prop washer tests used both pull rope Sullivan electric starter engine started immediately using either method never got pop out flipping hand Once pa t starting characteristics engine thee several items interestsome good some bad nicest things about Evra its in-line layout past weve talked about nice have engine no wider flywheel certainly tbe Evras case accomplished putting magneto right front cylinder intake rear crankcase cover course leads worst things about engine look data sheets youll find %-in between carburetor firewall carb does have built-in choke outin-the open test stand mounting hard properly choke engine built-in remotely operable choke would valuable addition engine As near could tell Evra never run briefly Most engines have worked have shown signs least short test runs decided give extra tankful break-in tendency heat up during operations indications like several other engines will need fair amount running really reach its peak ito low vibration easily cowled shape Evra should good engine lighter Giant Scale models especially original used flat in-line engine Husky 20 covered 23 Husky previous report isnt much say about slightly smaller one easily-cowled engines especially oiler pump removed other hand pump could very useful smoke system have room struck fairly flat power curve engine Husky 20 well made engine company very good reputation small engine field should able handle aircraft designed Quadra 118 Model Aviation will easier get some Super Hustler Mk II another engine has available some time test engine latest version understand significant differences ignition system have no personal experience earlier model cannot compare two Hustler significantly different Big Bangers Instead magneto uses onboard battery coil generate spark timing provided Hall Effect sensor electronic amplifier arrangement results cleaner looking engine since usual flywheel magneto coil gone carb front cylinder Hustler easily-cowled engine other hand ignition system requires relative myriad wires attendant increased probability failure test runs cut short problems couldnt straigtened out field First crimped-on battery connectors came off managed locate problem effect temporary fix Later engine began run rough refused start found lead soldered ground lug broken took care still no spark finally decided put off further attempts until could sort things Out As result did get some larger props have fuel consumption figures covered range props including recommended 20-8 figures show peak Zinger 20-6 will add data can collect Like Evra Hustler appears effort produce Big Banger configura tion closer what modelers have come expect certainly accomplishes wonder its worth added complication ignition system Schneider Races/Berliner Continued page 44 never have happened Lady Houston come forth contribution $500000 government refused foot bill Happily two S6B built John Boothman pilot # s-is 95 roared around course amazement thousands lined shores majestic demonstration aeronautics raised stature British aircraft industry its highest points wasnt very good racing Soon after race G H Stainforth became first person fly officially faster 400 mph set yet another Absolute World Speed Record time 4088 mph same S6B greastest seaplane raceand maybe greatest air racewas over Too bad French preparing several machines 1933 Schneider including pair Bernard Racers new 2000-hp Lorraine Radium engine Italians working bugs out sensational Macchi-Castoldi MC72 its tandem engines counterrotating propellers would later set 3-km speed record 441 mph still stands honor pilot Francesco Agello Though cheers soon died out lessons remained great mind Supermarine designer Mitchell came 1936 first thousands Spitfires Napier Lions Rolls Royce R engines came Merlin Curtiss D- 12 came Allison V-i 710 P-38 P-39 P-40 early P-Si ever-cleaner racers came flood knowledge about make airplanes go faster Isnt what air racing October1981 119 F4t ISpn~-~et3M331494a
Edition: Model Aviation - 1981/10
Page Numbers: 36, 37, 38, 115, 118, 119
THOSE OF YOU have following thing bundled up coats gloves series may remember lead photos Part 1 big ear muffs useful ear warming back April issue showed us doing sound deadening first test b Beckman Kirby Crawford bi han ersfoi latest report intrepid team big engine testers installment look four popular Giant Scale engines interlude answer some questions submitted readers Part 4 runs made late November early December anyone thinks Virginia too far south get cold doesnt know about northern Virginia lead photo time shows Kirby trying function survive 4th July weekend same location reason mentioning empha size difference weather conditions between first test session fact other tests reported Parts 2 3 made earlier year conditions very similar first time session however temperature humidity 90s has affect engine performance dont try make direct comparisons earlier data did wind up rough idea effect different conditions Bobs Homelite 1 6 run during earlier sessions before variety props now available Dur ing earlier run cool weather engines best performance 16 lb thrust time around same prop Kolbo 20-5 produced 145 lb thrust decrease almost 10% reasonable assume engines will similarly affected differ ences due differing conditions cannot over emphasized please take adequately account reviewing results never intended make detailed comparisons performance different engines goal still try fill little gap infor mation about Big Bangers available have getting lot feedback about series happily positive have some good questions raised would like try answering comment hear often Static Kirby tweaks Evra during its break-in run Nothern Virginia weather July somewhat different thrust doesnt mean anything thing way November beginning projectreally counts performance air PropTZTZZD T ZDT Z T ZK T Engine16-416-516-616-616-818-618-618-618-818-818-818-1018-1020-520-6 Idle RPM2800280025002300230021002100210021002200210021002100 ETop RPM8400825075506600670069506700675069506000620067006000 Lb Thrust115121251251414121351375 1313514514 Idle RPM3100 2400 2900 3000 2500 2700 2700 2500 2500 2600 2300 2200 2800 2200 2700 RPM10800 9250 9200 8700 8150 6600 8000 7200 6650 6900 7150 5850 6150 6600 5950 Lb Thrust 125135135131412515145125141451275 1313514 Idle RPM 2300 2300 2300 2200 2100 2100 2100 2200 2100 2100 2100 2100 2100 2100 2100 Top RPM 9800 8950 9000 8800 8250 6800 7900 7300 7000 7100 7000 6200 6400 6900 6100 ILbThrust 10131351351413151551475 15141425 1451615 ho Idle RPMDDynathrustGGrish2200 2200 2200 2200 27002200 rTop RPMKKolboTTop FliteZZinger845086008950775080007650 iLb Thrust2021225222123 36 Model Aviation HOME LITE ENGINE DATA Displacement 16 Cu Supplier NAhomemade conversion Price NA Availability NA Mfg Homelite Original use Chainsaw Weight 3 lb 15 oz mount TEST DATA SUMMARY Max thrust 145 lb @ 6700 rpm Kolbo 20-5 prop 161 fuel mix @ 08 oz/min fuel consumption Accessories supplied Engine mount Homemade 3/32-in sheet alum Prop hub Homemade Recommended propeller Kolbo 20-5 Recommended fuel mix 161 Carburetor Make type Homeilte Waibro diaphragm pump Controls available Throttle choke Adjustments avail Idle set screw low-speed mixture Ignition Type Magneto mechanical points Spark plug Champion RCJ8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Grounding wire can added magneto Internal details Induction Reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Forged steel two pieces pressed together Bearings Caged needles front rear plus roller thrust bearing Conrod Stamped steel Bearings Rollerplain wrist pin Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firwall prop mount supplied 6-7/8 2 Prop rearmost point excluding rear shaft 5-1/8 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5 plug @ 5-1/8 behind prop 5 VertIcal dimensions thrust line a Up 5 plug @ 5-1/8 behind prop b Down 4 carb @ 3 behind prop 6 Horizontal extension thrust line 2 carb @ 3 behind prop 7 Propeller hub diameter 11/2 Bolt hore diameter NAsingle 5/16-24 bolt 8 Propeller washer 112 aluminum 9 MountIng bolt pattern NA Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat compact except radial extension intake 2Amount quality instructions NA 3Ease starting Cold GoodiS 20 flips b Hot GoodS 10 flips 4 Ease mounting control hook-up Radial mounting easily made straight throttle hook-up 5 Ease carburetor adjustments Difficult engine running 6 Vibration levels Fairly low better chainsaw-derived engines 7 Cowlability In-line-type cowls difficult because carb position 8 Crankshaft bearing slop Very noticeable agree second half first part Granted performance air really bottom line Peak performance air depends proper combination air frame engine propeller static thrust tests ground wont tell optimum combina tion thing finds building plane installing engine putting prop flying try different props different trim and/or balance airframe until get what want what engine cant hack What find engine would go cowl will just barely fly labor love spent year have got much power weight nose its bear fly answer change engine isnt quite simple changing prop can has done weve heard lot horror stories makes sense start out engine reasonable fit power requirements some Giant Scale modelers dont necessarily include ourselves no problem pick engine will ball park aircraft being modeled vast majority us however would nice have some reasonably simpleway judge capabilities various engines available match requirements kind data around would never have embarked what has turned out time-consuming exhaust ing fascinating project Once started static thrust reasonably simple way measure engine capability Before series done will give thoughts match specific requirements Another point has brought up know pitch prop really what manufacturer says answer that dont know really dont care dont think average modeler cares Again performance counts prop does job dont really care what exact pitch No manufacturer deliberately going carve label prop improperly say differences props cannot exist supposed same Wood stable raw material world density grain manufacturing tolerances can result variations prop next Wood raw material props nowadays molded glass-filled plastic props can have similar variations reason have used prop given make size tests since primarily looking engines props Someday may take look props see much vary since thing modeler really needs consis tency As long 20-8 prop given make same cares pitch eight inches eight-and-a-half inches subject props reader suggested should use props readily available modelers reference course Kolbo Korp prop has used tests prop few hand started whole thing size 20-5 selected Kirby several years ago set up first lIomelite engine has proven successful prop Kirbys Mr Mulligan Gulfhawk both using Homelite engine included testing just because Z D T Z D T Z G T ZTZ G Z GProp 20-620-820-820-820-1020-1020-1020-1222-622-622-822-822-1022-1022-12 ne 2100210021002200230023002300230024002400Idle RPMi 6550600055005500495048005250520057004500Top RPM 137514135131225 1213513514612LbThrust 25002400 2600Idle RPM 5700 59005000 5300Top RPM 251112Lb Thrust 2200 22002000 2000 2200 1900 2000 2000 2000 2000 2000 2000 2000 2000 2000 Idle RPMI 6900 61505700 5800 5300 5300 5500 4700 5500 5800 4950 5350 4500 4500 3200 Top RPM 1514515151451451475 12515145151512148Lb Thrust 23002200 2300 2100 2000Idle RPM 8350 74006950 7000 6500 6550Top RPM 4t 2422252325 2225 2222Lb Thrust ber1981 37 Homelite purrs away itsfuel consumption run Its eventual home will Sparrowhawk Bob ever finishes plane it has turned out better performers engines Granted readily available hobby shops fact may no longer available other hand obviously has something going it might pay off look After never looked used anything wasnt readily available everyone flying models would still small arrows use mufflers another subject keeps coming up As pointed out last installment since didnt have mufflers engines decided make runs Three current engines came mufflers looked like good time get some idea what effect Husky has small stamped steel muffler assembly part original chainsaw installation After completed other tests made two additional runs same prop First ran muffler made sure engine peaked Out put muffler re-tuned engine noticeable effect improvement engines idling top end however dropped about 100 rpm lost almost pound thrust Hustler Evra have similar mufflers made B&B Specialties mufflers have fairly large rectangular expansion chambers two good-sized tubular stacks unable run Hustler its muffler did run Evra described above Husky same improvement idle observed time high end engine picked up 200 rpm solid pound thrust Obviously smaller model engines right amount back pressure can actually increase engines output too much will rob power didnt try judge noise reduction wish thank following firms assistance part Big Bangers project Dynathrust Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 EWH Specialties Inc 3012 Avenue E East Arlington TX 76011 Super Hustler Mk II Giezendanner USA PO Box 818 Pottstown PA 19464 Grish Bros St John IN 46373 Hobby Lobby International 1 Franklin Pike Circle Brentwood TN 37027 Evra J&Z Products 25029 5 Vermont Ave Harbor City CA 90710 Zinger JC Enterprises 2251 SW 28th Terrace Ft Continued page 115 Accessories supplied Engine mount No available Prop hub YesMuffler No available Other Pull start cord pulley Additional items required excluding prop fuel tank None Recommended propeller specifIed Recommended fuel mix 201 Carburetor Make type Walbrodiaphragm pump Controls available Throttle Adjustments avail Idle set screw high low mixture Ignition Type Magnetoelectronic Spark plug Champion DJ-8J Recommended gap 0025 Magneto gap 0015 Point gap NA Kill disable system Grounding lug magneto Internal details Induction Rear reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Model engine style laminated counter-weight Bearings Two sealed ball bearings Conrod Twopiece stamped assembly Bearings Caged roller bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 7 2 Prop rearmost point excluding rear shaft 6-5/8 carb 3 Prop forwardmost point 11/16 magneto 4 Maximum extension thrust line 5-9/16 plug behind Drop 5 Vertical dimensions thrust line a Up 5-9/16 plug @ 33/4 behind prop b Down 1f4 flywheel @ 1 behind prop 6 Horizontal extension thrust line 1/4 flywheel @ 1 behind prop 7 Propeller hub diameter 11/2 Bolt hole diameter NAsingle 3/8-16 stud 8 Propeller washer 11/2 aluminum starter pulley 9 Mounting bolt pattern 2-5/8 sq centered thrust line Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Very compactlooks like oversize model eng 2 Amount quality instructions Very goodcovers needed info modelers viewpoint 3 Ease starting See notes 4 Ease mounting control hook-up Radial mountstraightfor ward throttle hook-up 5 Ease carburetor adjustments idle screw almost Inaccessible mixture easy 6 Vibration levels Extremely smooth speeds 7 Cowiability Excellent requires deep firewall 8 Crankshaft bearing slop None detectable 38 Model Aviation its battery ignition module strapped fuel tank test runs shaft extension just behind prop added facilitate prop changes during testing HUBBY LUBBY/EVHA 190 ENGINE DATA Displacement 19 Cu Ifl Supplier Hobby Lobby Intl Price $7900 Mount $19 Muf 1 Franklin Pike CIrclefler $1995 Brentwood TN 37027Avatlabllity Direct Mfg Piston Powered Products Original use Lawnboy weed whip Weight 4 lb 9 oz w/mt & muf TEST DATA SUMMARY Max thrust 15 lb @ 5700 rpm Zinger 206 prop 201 fuel mix @ 08 oz/min fuel consumption Dieter Schiuter world famous helicopter designer presents new MinI-5y & Super MIniBoy Show Seration Toledo & Macs Features 25 40 convertible Cyclone fan cooling No heat sinks needed Spinner starting Shaft drive tail rotor Factory researched & developed ChoIpof Rapping hinges Seepav Collective heads Rock table yet fully aerobatic World fv~ois Schluter quality Noi Ccl le9tIve 19995 CollectIve 22995 parts stock World standard metrics sob dealer order direct train UNSEAM Inc 2594 subsidiary MINIATURE AIRCRAFT North Orange Blossom Trail ndo FL 32804 Phone 30514221531 plans using small nails brads hold place dry Since bends gentle laminations will form quite easily After adding ribs wing add upper 1/4 square spar spar laminated two strips alsa Although wing assembled flat bench top spar does bend downward toward tips Wet both pieces water place lamination rib notches glue top lamination sure install 3/32 vertical grain spar webs shown plans add considerable strength wing tail surfaces built up p balsa t balsa tip segments After adding dihedral wing sheeting center section 1/16 sheet balsa can return fuselage complete wing saddle Glue 1/32 ply wing rest fuselage wing place provide proper shape Trim fuselage sheeting necessary get good wing-to-saddle fit Finally add heavy paper 1/16 balsa sheet wing fillet between fuselage ply saddle Dont use usual epoxy putty resin microballoons filletsthis materials too heavy Covering finishing Since trying make everything light possible best way go Super MonoKote similar lightweight covering bottom wing tail fuselage covered flat Dove Gray top plane covered flat Olive Drab upper surfaces camouflaged coat flat tan light earth enamel epoxy Suitable paints include Pactra Military Flats spray can RS Perfect Paint K&B Hobbypoxy Before spraying wipe surface MonoKote thinner acetone remove trace grease oil After camouflage pattern has painted mask spray roundels numbers use masking tape masking markings remove tape adjacent colors will probably lifted off made stencils newspaper just wet paper slide wet stencil place spray Simple worked fine Miscellaneous strnctural details standard called out plan such landing gear mounting blocks wing hold-on dowel nylon bolt nose cowl can built up balsa blocks sheet can make fiberglass keep light vacuum-form out sheet plastic Light cardboard landing gear covers attached landing gear legs silicone glue add final touch ready fly Flying Notes Before flying make sure CG right place wing has no warps wing big dont want slightest warp Reheating covering twisting offending surface simple cure advisable make some fast taxi tests before flight will help get feel airplane before first takeoff Begin takeoff rnn holding up elevator prevent nose-over throttle gunned As soon some speed built up relax neutral plane may fly off itself may require slight bit up elevator help rotation good duration Astro 15 dont indulge steep turns altitude-losing maneu vers Gentle wide turns will retain altitude give maximum flight time taxiing position back pits on-off switch used necessary very effective have motor servo set up full power forward throttle control halfway back gives cruise power full back stick shuts off motor Flying Spitfire beautiful experience Its unique mixture Scale Soaring RC Free Flight Dont look usual gas model performance though wish tear up skies better off usual noisy greasy bombs Im knocking kind flying mind since much RC fun fits category lightly-loaded Scale electric stuff new refreshing change pace dont forget ship also does nice relaxed job sport flying glow engine scale realism something like scale speed appreciated either case sport Spit calm summer evening something behold can build light youll love Big Bangers/BeckmanCrawford Continued page 38 Lauderdale FL 33312 Husky Top Flite Models Inc. l9JI Narragansett Ave Chicago IL 60639 Now lets get notes subjective com ments about four engines tested time Homelite 16 engine currently available directly usable form fairly easy convert several use around country have inquiries about itsince Kirby both use As far Continued page 118 October1981 115 IN 81 ITS RICKS R/C MODELS % INTRODUCING THE RICK STICK SUPREMETHE WEEKENDER FLITE BOX SPORTTRAINER- FULLYAEROBATICSIZE 124 x 12 x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 40 $4995 Pm-Cut Kit Hardware Landing Gear Full Length wood mdSPACE FOR 15 Drawer Cabinet 1-Gal Fuel Pre-Built Ready Fine Sand & Cover Battery Fuel Pump Power Panel Full Length Balsa Wood & Spruce SparsProp Bin Tool Tray Electric Hinged Surfaces Hardware HalIco GearStarter Cleaner Towels Nylon Bolts Tapped Bolt Gear&WingNo Other Like Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ICECKOavtO3OO Handling RIcws 1RODELS INC FL 33515I Kins Super coat Priner spray can$ 3 95 Point ThinnerS 4 95 Point Filters$ 1 49 Engine Oil$ 1 50 Engine Oil Kit519 00 Engine Rebuilding dleanrng Storage & Maintenance Kt$ 5 95 Kleen craay$ 1 95 Dust Masks$ 1 49 Send SASE fore 2 Box 481EIf avail FREE CatalogN-CRAFT As hand KY 41101yourlocalhobbyshop Dealers Invited i6O6i928-4763 order direct KY res add 5% sales tax AVIATION FILM CLASSICS ON VIDEOTAPE START YOUR OWN COLLECTION SF AVIATION FILRO ON EASY TO USE INEUPENOISE TIDEOCASOETTES ASIATION FILRS OF ALL TYPES FEATURES WAR DOCOPIENTARIES NEWSREEL ETC NOW ASAILABLE SN SlOES TAPESENT $1 00 FOR CATALSA UDS 1021J NSEPULVEDA MANHATTAS BCH CA 00256 Fiberglass Materials 5squareyards Choice oz cloth 12 Hour Epoxy Resin01500 per qt Mold ReleaseS3OO 16 02 Epoxy Primer K&BI03000 per gal Epoxy PaintThinner IK&BI01000 per gal Calitornia Residents add 6% Sales Tao Check Money Order onlySorry No COOs Bob Smith RIC Aircraft PO Box 33335 Granada Hills CA 91344 know Kirby did first conversion small chainsaw engine about four years ago bought chainsaw sale removed discarded saw parts cut away unneeded parts castiggs made prop adapter turned down flywheel fins business first engine went Nosen Mr Mulligan has flying beautifully three years has also flown Kirbys 28-lb Gulfhawk engine reported converted Bob use F9C-2 Sparrowhawk engine purchased local Homelite service center $6500 July August 1978 milling machine lathe used conversion work abso lutely necessary excess crankcase casting can cut away hacksaw file Kirby did turned out own prop adapters units available use Quadra will fit Homelite fins can left flywheel small weight penalty engine good size some smaller Giant Scale designs has proven realiable rugged power plant diffi cult cowl anything radial engine design intake manifold extending angle oppo site cylinder makes almost impossible get engine inline flat engine type cowls Note applications far have radials Kirbys 28-lb GulThawk far beyond what now consider reasonable engine size aircraft underpowered does fly little Homelite pulls through very realistic aerobatics Hobby Lobby/Evra 190 19 Cu engine has lot significant differences engines have worked up now has available three four years introduced fairly early continuing swell interest Giant Scale represents merging model airplane small engine techniques opinion has received less attention modelers truly deserves people Hobby Lobby took cylinder piston flywheel ignition system weed whip engine designed model-engine-type crankcase crankshaft complete mas sive ball bearings support shaft Walbro diaphragm pump carburetor mounted crankcase rear cover reed valve control induction result engine looks ways like larger version engines modelers have used years retains carburetor self-contained ignition have proven literally millions small gasoline engines crankcase design belongs Hobby Lobby engines manufac tured Piston Powered Products company makes original engine An electronic ignition system used engine starts easily once realize allow important factor engine must turning over approximately 400 rpm before ignition system will generate spark possible hand difficult point really clarified informa tion supplied early models engine current engines include starter pull rope pulley built prop washer tests used both pull rope Sullivan electric starter engine started immediately using either method never got pop out flipping hand Once pa t starting characteristics engine thee several items interestsome good some bad nicest things about Evra its in-line layout past weve talked about nice have engine no wider flywheel certainly tbe Evras case accomplished putting magneto right front cylinder intake rear crankcase cover course leads worst things about engine look data sheets youll find %-in between carburetor firewall carb does have built-in choke outin-the open test stand mounting hard properly choke engine built-in remotely operable choke would valuable addition engine As near could tell Evra never run briefly Most engines have worked have shown signs least short test runs decided give extra tankful break-in tendency heat up during operations indications like several other engines will need fair amount running really reach its peak ito low vibration easily cowled shape Evra should good engine lighter Giant Scale models especially original used flat in-line engine Husky 20 covered 23 Husky previous report isnt much say about slightly smaller one easily-cowled engines especially oiler pump removed other hand pump could very useful smoke system have room struck fairly flat power curve engine Husky 20 well made engine company very good reputation small engine field should able handle aircraft designed Quadra 118 Model Aviation will easier get some Super Hustler Mk II another engine has available some time test engine latest version understand significant differences ignition system have no personal experience earlier model cannot compare two Hustler significantly different Big Bangers Instead magneto uses onboard battery coil generate spark timing provided Hall Effect sensor electronic amplifier arrangement results cleaner looking engine since usual flywheel magneto coil gone carb front cylinder Hustler easily-cowled engine other hand ignition system requires relative myriad wires attendant increased probability failure test runs cut short problems couldnt straigtened out field First crimped-on battery connectors came off managed locate problem effect temporary fix Later engine began run rough refused start found lead soldered ground lug broken took care still no spark finally decided put off further attempts until could sort things Out As result did get some larger props have fuel consumption figures covered range props including recommended 20-8 figures show peak Zinger 20-6 will add data can collect Like Evra Hustler appears effort produce Big Banger configura tion closer what modelers have come expect certainly accomplishes wonder its worth added complication ignition system Schneider Races/Berliner Continued page 44 never have happened Lady Houston come forth contribution $500000 government refused foot bill Happily two S6B built John Boothman pilot # s-is 95 roared around course amazement thousands lined shores majestic demonstration aeronautics raised stature British aircraft industry its highest points wasnt very good racing Soon after race G H Stainforth became first person fly officially faster 400 mph set yet another Absolute World Speed Record time 4088 mph same S6B greastest seaplane raceand maybe greatest air racewas over Too bad French preparing several machines 1933 Schneider including pair Bernard Racers new 2000-hp Lorraine Radium engine Italians working bugs out sensational Macchi-Castoldi MC72 its tandem engines counterrotating propellers would later set 3-km speed record 441 mph still stands honor pilot Francesco Agello Though cheers soon died out lessons remained great mind Supermarine designer Mitchell came 1936 first thousands Spitfires Napier Lions Rolls Royce R engines came Merlin Curtiss D- 12 came Allison V-i 710 P-38 P-39 P-40 early P-Si ever-cleaner racers came flood knowledge about make airplanes go faster Isnt what air racing October1981 119 F4t ISpn~-~et3M331494a
Edition: Model Aviation - 1981/10
Page Numbers: 36, 37, 38, 115, 118, 119
THOSE OF YOU have following thing bundled up coats gloves series may remember lead photos Part 1 big ear muffs useful ear warming back April issue showed us doing sound deadening first test b Beckman Kirby Crawford bi han ersfoi latest report intrepid team big engine testers installment look four popular Giant Scale engines interlude answer some questions submitted readers Part 4 runs made late November early December anyone thinks Virginia too far south get cold doesnt know about northern Virginia lead photo time shows Kirby trying function survive 4th July weekend same location reason mentioning empha size difference weather conditions between first test session fact other tests reported Parts 2 3 made earlier year conditions very similar first time session however temperature humidity 90s has affect engine performance dont try make direct comparisons earlier data did wind up rough idea effect different conditions Bobs Homelite 1 6 run during earlier sessions before variety props now available Dur ing earlier run cool weather engines best performance 16 lb thrust time around same prop Kolbo 20-5 produced 145 lb thrust decrease almost 10% reasonable assume engines will similarly affected differ ences due differing conditions cannot over emphasized please take adequately account reviewing results never intended make detailed comparisons performance different engines goal still try fill little gap infor mation about Big Bangers available have getting lot feedback about series happily positive have some good questions raised would like try answering comment hear often Static Kirby tweaks Evra during its break-in run Nothern Virginia weather July somewhat different thrust doesnt mean anything thing way November beginning projectreally counts performance air PropTZTZZD T ZDT Z T ZK T Engine16-416-516-616-616-818-618-618-618-818-818-818-1018-1020-520-6 Idle RPM2800280025002300230021002100210021002200210021002100 ETop RPM8400825075506600670069506700675069506000620067006000 Lb Thrust115121251251414121351375 1313514514 Idle RPM3100 2400 2900 3000 2500 2700 2700 2500 2500 2600 2300 2200 2800 2200 2700 RPM10800 9250 9200 8700 8150 6600 8000 7200 6650 6900 7150 5850 6150 6600 5950 Lb Thrust 125135135131412515145125141451275 1313514 Idle RPM 2300 2300 2300 2200 2100 2100 2100 2200 2100 2100 2100 2100 2100 2100 2100 Top RPM 9800 8950 9000 8800 8250 6800 7900 7300 7000 7100 7000 6200 6400 6900 6100 ILbThrust 10131351351413151551475 15141425 1451615 ho Idle RPMDDynathrustGGrish2200 2200 2200 2200 27002200 rTop RPMKKolboTTop FliteZZinger845086008950775080007650 iLb Thrust2021225222123 36 Model Aviation HOME LITE ENGINE DATA Displacement 16 Cu Supplier NAhomemade conversion Price NA Availability NA Mfg Homelite Original use Chainsaw Weight 3 lb 15 oz mount TEST DATA SUMMARY Max thrust 145 lb @ 6700 rpm Kolbo 20-5 prop 161 fuel mix @ 08 oz/min fuel consumption Accessories supplied Engine mount Homemade 3/32-in sheet alum Prop hub Homemade Recommended propeller Kolbo 20-5 Recommended fuel mix 161 Carburetor Make type Homeilte Waibro diaphragm pump Controls available Throttle choke Adjustments avail Idle set screw low-speed mixture Ignition Type Magneto mechanical points Spark plug Champion RCJ8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Grounding wire can added magneto Internal details Induction Reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Forged steel two pieces pressed together Bearings Caged needles front rear plus roller thrust bearing Conrod Stamped steel Bearings Rollerplain wrist pin Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firwall prop mount supplied 6-7/8 2 Prop rearmost point excluding rear shaft 5-1/8 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5 plug @ 5-1/8 behind prop 5 VertIcal dimensions thrust line a Up 5 plug @ 5-1/8 behind prop b Down 4 carb @ 3 behind prop 6 Horizontal extension thrust line 2 carb @ 3 behind prop 7 Propeller hub diameter 11/2 Bolt hore diameter NAsingle 5/16-24 bolt 8 Propeller washer 112 aluminum 9 MountIng bolt pattern NA Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat compact except radial extension intake 2Amount quality instructions NA 3Ease starting Cold GoodiS 20 flips b Hot GoodS 10 flips 4 Ease mounting control hook-up Radial mounting easily made straight throttle hook-up 5 Ease carburetor adjustments Difficult engine running 6 Vibration levels Fairly low better chainsaw-derived engines 7 Cowlability In-line-type cowls difficult because carb position 8 Crankshaft bearing slop Very noticeable agree second half first part Granted performance air really bottom line Peak performance air depends proper combination air frame engine propeller static thrust tests ground wont tell optimum combina tion thing finds building plane installing engine putting prop flying try different props different trim and/or balance airframe until get what want what engine cant hack What find engine would go cowl will just barely fly labor love spent year have got much power weight nose its bear fly answer change engine isnt quite simple changing prop can has done weve heard lot horror stories makes sense start out engine reasonable fit power requirements some Giant Scale modelers dont necessarily include ourselves no problem pick engine will ball park aircraft being modeled vast majority us however would nice have some reasonably simpleway judge capabilities various engines available match requirements kind data around would never have embarked what has turned out time-consuming exhaust ing fascinating project Once started static thrust reasonably simple way measure engine capability Before series done will give thoughts match specific requirements Another point has brought up know pitch prop really what manufacturer says answer that dont know really dont care dont think average modeler cares Again performance counts prop does job dont really care what exact pitch No manufacturer deliberately going carve label prop improperly say differences props cannot exist supposed same Wood stable raw material world density grain manufacturing tolerances can result variations prop next Wood raw material props nowadays molded glass-filled plastic props can have similar variations reason have used prop given make size tests since primarily looking engines props Someday may take look props see much vary since thing modeler really needs consis tency As long 20-8 prop given make same cares pitch eight inches eight-and-a-half inches subject props reader suggested should use props readily available modelers reference course Kolbo Korp prop has used tests prop few hand started whole thing size 20-5 selected Kirby several years ago set up first lIomelite engine has proven successful prop Kirbys Mr Mulligan Gulfhawk both using Homelite engine included testing just because Z D T Z D T Z G T ZTZ G Z GProp 20-620-820-820-820-1020-1020-1020-1222-622-622-822-822-1022-1022-12 ne 2100210021002200230023002300230024002400Idle RPMi 6550600055005500495048005250520057004500Top RPM 137514135131225 1213513514612LbThrust 25002400 2600Idle RPM 5700 59005000 5300Top RPM 251112Lb Thrust 2200 22002000 2000 2200 1900 2000 2000 2000 2000 2000 2000 2000 2000 2000 Idle RPMI 6900 61505700 5800 5300 5300 5500 4700 5500 5800 4950 5350 4500 4500 3200 Top RPM 1514515151451451475 12515145151512148Lb Thrust 23002200 2300 2100 2000Idle RPM 8350 74006950 7000 6500 6550Top RPM 4t 2422252325 2225 2222Lb Thrust ber1981 37 Homelite purrs away itsfuel consumption run Its eventual home will Sparrowhawk Bob ever finishes plane it has turned out better performers engines Granted readily available hobby shops fact may no longer available other hand obviously has something going it might pay off look After never looked used anything wasnt readily available everyone flying models would still small arrows use mufflers another subject keeps coming up As pointed out last installment since didnt have mufflers engines decided make runs Three current engines came mufflers looked like good time get some idea what effect Husky has small stamped steel muffler assembly part original chainsaw installation After completed other tests made two additional runs same prop First ran muffler made sure engine peaked Out put muffler re-tuned engine noticeable effect improvement engines idling top end however dropped about 100 rpm lost almost pound thrust Hustler Evra have similar mufflers made B&B Specialties mufflers have fairly large rectangular expansion chambers two good-sized tubular stacks unable run Hustler its muffler did run Evra described above Husky same improvement idle observed time high end engine picked up 200 rpm solid pound thrust Obviously smaller model engines right amount back pressure can actually increase engines output too much will rob power didnt try judge noise reduction wish thank following firms assistance part Big Bangers project Dynathrust Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 EWH Specialties Inc 3012 Avenue E East Arlington TX 76011 Super Hustler Mk II Giezendanner USA PO Box 818 Pottstown PA 19464 Grish Bros St John IN 46373 Hobby Lobby International 1 Franklin Pike Circle Brentwood TN 37027 Evra J&Z Products 25029 5 Vermont Ave Harbor City CA 90710 Zinger JC Enterprises 2251 SW 28th Terrace Ft Continued page 115 Accessories supplied Engine mount No available Prop hub YesMuffler No available Other Pull start cord pulley Additional items required excluding prop fuel tank None Recommended propeller specifIed Recommended fuel mix 201 Carburetor Make type Walbrodiaphragm pump Controls available Throttle Adjustments avail Idle set screw high low mixture Ignition Type Magnetoelectronic Spark plug Champion DJ-8J Recommended gap 0025 Magneto gap 0015 Point gap NA Kill disable system Grounding lug magneto Internal details Induction Rear reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Model engine style laminated counter-weight Bearings Two sealed ball bearings Conrod Twopiece stamped assembly Bearings Caged roller bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 7 2 Prop rearmost point excluding rear shaft 6-5/8 carb 3 Prop forwardmost point 11/16 magneto 4 Maximum extension thrust line 5-9/16 plug behind Drop 5 Vertical dimensions thrust line a Up 5-9/16 plug @ 33/4 behind prop b Down 1f4 flywheel @ 1 behind prop 6 Horizontal extension thrust line 1/4 flywheel @ 1 behind prop 7 Propeller hub diameter 11/2 Bolt hole diameter NAsingle 3/8-16 stud 8 Propeller washer 11/2 aluminum starter pulley 9 Mounting bolt pattern 2-5/8 sq centered thrust line Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Very compactlooks like oversize model eng 2 Amount quality instructions Very goodcovers needed info modelers viewpoint 3 Ease starting See notes 4 Ease mounting control hook-up Radial mountstraightfor ward throttle hook-up 5 Ease carburetor adjustments idle screw almost Inaccessible mixture easy 6 Vibration levels Extremely smooth speeds 7 Cowiability Excellent requires deep firewall 8 Crankshaft bearing slop None detectable 38 Model Aviation its battery ignition module strapped fuel tank test runs shaft extension just behind prop added facilitate prop changes during testing HUBBY LUBBY/EVHA 190 ENGINE DATA Displacement 19 Cu Ifl Supplier Hobby Lobby Intl Price $7900 Mount $19 Muf 1 Franklin Pike CIrclefler $1995 Brentwood TN 37027Avatlabllity Direct Mfg Piston Powered Products Original use Lawnboy weed whip Weight 4 lb 9 oz w/mt & muf TEST DATA SUMMARY Max thrust 15 lb @ 5700 rpm Zinger 206 prop 201 fuel mix @ 08 oz/min fuel consumption Dieter Schiuter world famous helicopter designer presents new MinI-5y & Super MIniBoy Show Seration Toledo & Macs Features 25 40 convertible Cyclone fan cooling No heat sinks needed Spinner starting Shaft drive tail rotor Factory researched & developed ChoIpof Rapping hinges Seepav Collective heads Rock table yet fully aerobatic World fv~ois Schluter quality Noi Ccl le9tIve 19995 CollectIve 22995 parts stock World standard metrics sob dealer order direct train UNSEAM Inc 2594 subsidiary MINIATURE AIRCRAFT North Orange Blossom Trail ndo FL 32804 Phone 30514221531 plans using small nails brads hold place dry Since bends gentle laminations will form quite easily After adding ribs wing add upper 1/4 square spar spar laminated two strips alsa Although wing assembled flat bench top spar does bend downward toward tips Wet both pieces water place lamination rib notches glue top lamination sure install 3/32 vertical grain spar webs shown plans add considerable strength wing tail surfaces built up p balsa t balsa tip segments After adding dihedral wing sheeting center section 1/16 sheet balsa can return fuselage complete wing saddle Glue 1/32 ply wing rest fuselage wing place provide proper shape Trim fuselage sheeting necessary get good wing-to-saddle fit Finally add heavy paper 1/16 balsa sheet wing fillet between fuselage ply saddle Dont use usual epoxy putty resin microballoons filletsthis materials too heavy Covering finishing Since trying make everything light possible best way go Super MonoKote similar lightweight covering bottom wing tail fuselage covered flat Dove Gray top plane covered flat Olive Drab upper surfaces camouflaged coat flat tan light earth enamel epoxy Suitable paints include Pactra Military Flats spray can RS Perfect Paint K&B Hobbypoxy Before spraying wipe surface MonoKote thinner acetone remove trace grease oil After camouflage pattern has painted mask spray roundels numbers use masking tape masking markings remove tape adjacent colors will probably lifted off made stencils newspaper just wet paper slide wet stencil place spray Simple worked fine Miscellaneous strnctural details standard called out plan such landing gear mounting blocks wing hold-on dowel nylon bolt nose cowl can built up balsa blocks sheet can make fiberglass keep light vacuum-form out sheet plastic Light cardboard landing gear covers attached landing gear legs silicone glue add final touch ready fly Flying Notes Before flying make sure CG right place wing has no warps wing big dont want slightest warp Reheating covering twisting offending surface simple cure advisable make some fast taxi tests before flight will help get feel airplane before first takeoff Begin takeoff rnn holding up elevator prevent nose-over throttle gunned As soon some speed built up relax neutral plane may fly off itself may require slight bit up elevator help rotation good duration Astro 15 dont indulge steep turns altitude-losing maneu vers Gentle wide turns will retain altitude give maximum flight time taxiing position back pits on-off switch used necessary very effective have motor servo set up full power forward throttle control halfway back gives cruise power full back stick shuts off motor Flying Spitfire beautiful experience Its unique mixture Scale Soaring RC Free Flight Dont look usual gas model performance though wish tear up skies better off usual noisy greasy bombs Im knocking kind flying mind since much RC fun fits category lightly-loaded Scale electric stuff new refreshing change pace dont forget ship also does nice relaxed job sport flying glow engine scale realism something like scale speed appreciated either case sport Spit calm summer evening something behold can build light youll love Big Bangers/BeckmanCrawford Continued page 38 Lauderdale FL 33312 Husky Top Flite Models Inc. l9JI Narragansett Ave Chicago IL 60639 Now lets get notes subjective com ments about four engines tested time Homelite 16 engine currently available directly usable form fairly easy convert several use around country have inquiries about itsince Kirby both use As far Continued page 118 October1981 115 IN 81 ITS RICKS R/C MODELS % INTRODUCING THE RICK STICK SUPREMETHE WEEKENDER FLITE BOX SPORTTRAINER- FULLYAEROBATICSIZE 124 x 12 x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 40 $4995 Pm-Cut Kit Hardware Landing Gear Full Length wood mdSPACE FOR 15 Drawer Cabinet 1-Gal Fuel Pre-Built Ready Fine Sand & Cover Battery Fuel Pump Power Panel Full Length Balsa Wood & Spruce SparsProp Bin Tool Tray Electric Hinged Surfaces Hardware HalIco GearStarter Cleaner Towels Nylon Bolts Tapped Bolt Gear&WingNo Other Like Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ICECKOavtO3OO Handling RIcws 1RODELS INC FL 33515I Kins Super coat Priner spray can$ 3 95 Point ThinnerS 4 95 Point Filters$ 1 49 Engine Oil$ 1 50 Engine Oil Kit519 00 Engine Rebuilding dleanrng Storage & Maintenance Kt$ 5 95 Kleen craay$ 1 95 Dust Masks$ 1 49 Send SASE fore 2 Box 481EIf avail FREE CatalogN-CRAFT As hand KY 41101yourlocalhobbyshop Dealers Invited i6O6i928-4763 order direct KY res add 5% sales tax AVIATION FILM CLASSICS ON VIDEOTAPE START YOUR OWN COLLECTION SF AVIATION FILRO ON EASY TO USE INEUPENOISE TIDEOCASOETTES ASIATION FILRS OF ALL TYPES FEATURES WAR DOCOPIENTARIES NEWSREEL ETC NOW ASAILABLE SN SlOES TAPESENT $1 00 FOR CATALSA UDS 1021J NSEPULVEDA MANHATTAS BCH CA 00256 Fiberglass Materials 5squareyards Choice oz cloth 12 Hour Epoxy Resin01500 per qt Mold ReleaseS3OO 16 02 Epoxy Primer K&BI03000 per gal Epoxy PaintThinner IK&BI01000 per gal Calitornia Residents add 6% Sales Tao Check Money Order onlySorry No COOs Bob Smith RIC Aircraft PO Box 33335 Granada Hills CA 91344 know Kirby did first conversion small chainsaw engine about four years ago bought chainsaw sale removed discarded saw parts cut away unneeded parts castiggs made prop adapter turned down flywheel fins business first engine went Nosen Mr Mulligan has flying beautifully three years has also flown Kirbys 28-lb Gulfhawk engine reported converted Bob use F9C-2 Sparrowhawk engine purchased local Homelite service center $6500 July August 1978 milling machine lathe used conversion work abso lutely necessary excess crankcase casting can cut away hacksaw file Kirby did turned out own prop adapters units available use Quadra will fit Homelite fins can left flywheel small weight penalty engine good size some smaller Giant Scale designs has proven realiable rugged power plant diffi cult cowl anything radial engine design intake manifold extending angle oppo site cylinder makes almost impossible get engine inline flat engine type cowls Note applications far have radials Kirbys 28-lb GulThawk far beyond what now consider reasonable engine size aircraft underpowered does fly little Homelite pulls through very realistic aerobatics Hobby Lobby/Evra 190 19 Cu engine has lot significant differences engines have worked up now has available three four years introduced fairly early continuing swell interest Giant Scale represents merging model airplane small engine techniques opinion has received less attention modelers truly deserves people Hobby Lobby took cylinder piston flywheel ignition system weed whip engine designed model-engine-type crankcase crankshaft complete mas sive ball bearings support shaft Walbro diaphragm pump carburetor mounted crankcase rear cover reed valve control induction result engine looks ways like larger version engines modelers have used years retains carburetor self-contained ignition have proven literally millions small gasoline engines crankcase design belongs Hobby Lobby engines manufac tured Piston Powered Products company makes original engine An electronic ignition system used engine starts easily once realize allow important factor engine must turning over approximately 400 rpm before ignition system will generate spark possible hand difficult point really clarified informa tion supplied early models engine current engines include starter pull rope pulley built prop washer tests used both pull rope Sullivan electric starter engine started immediately using either method never got pop out flipping hand Once pa t starting characteristics engine thee several items interestsome good some bad nicest things about Evra its in-line layout past weve talked about nice have engine no wider flywheel certainly tbe Evras case accomplished putting magneto right front cylinder intake rear crankcase cover course leads worst things about engine look data sheets youll find %-in between carburetor firewall carb does have built-in choke outin-the open test stand mounting hard properly choke engine built-in remotely operable choke would valuable addition engine As near could tell Evra never run briefly Most engines have worked have shown signs least short test runs decided give extra tankful break-in tendency heat up during operations indications like several other engines will need fair amount running really reach its peak ito low vibration easily cowled shape Evra should good engine lighter Giant Scale models especially original used flat in-line engine Husky 20 covered 23 Husky previous report isnt much say about slightly smaller one easily-cowled engines especially oiler pump removed other hand pump could very useful smoke system have room struck fairly flat power curve engine Husky 20 well made engine company very good reputation small engine field should able handle aircraft designed Quadra 118 Model Aviation will easier get some Super Hustler Mk II another engine has available some time test engine latest version understand significant differences ignition system have no personal experience earlier model cannot compare two Hustler significantly different Big Bangers Instead magneto uses onboard battery coil generate spark timing provided Hall Effect sensor electronic amplifier arrangement results cleaner looking engine since usual flywheel magneto coil gone carb front cylinder Hustler easily-cowled engine other hand ignition system requires relative myriad wires attendant increased probability failure test runs cut short problems couldnt straigtened out field First crimped-on battery connectors came off managed locate problem effect temporary fix Later engine began run rough refused start found lead soldered ground lug broken took care still no spark finally decided put off further attempts until could sort things Out As result did get some larger props have fuel consumption figures covered range props including recommended 20-8 figures show peak Zinger 20-6 will add data can collect Like Evra Hustler appears effort produce Big Banger configura tion closer what modelers have come expect certainly accomplishes wonder its worth added complication ignition system Schneider Races/Berliner Continued page 44 never have happened Lady Houston come forth contribution $500000 government refused foot bill Happily two S6B built John Boothman pilot # s-is 95 roared around course amazement thousands lined shores majestic demonstration aeronautics raised stature British aircraft industry its highest points wasnt very good racing Soon after race G H Stainforth became first person fly officially faster 400 mph set yet another Absolute World Speed Record time 4088 mph same S6B greastest seaplane raceand maybe greatest air racewas over Too bad French preparing several machines 1933 Schneider including pair Bernard Racers new 2000-hp Lorraine Radium engine Italians working bugs out sensational Macchi-Castoldi MC72 its tandem engines counterrotating propellers would later set 3-km speed record 441 mph still stands honor pilot Francesco Agello Though cheers soon died out lessons remained great mind Supermarine designer Mitchell came 1936 first thousands Spitfires Napier Lions Rolls Royce R engines came Merlin Curtiss D- 12 came Allison V-i 710 P-38 P-39 P-40 early P-Si ever-cleaner racers came flood knowledge about make airplanes go faster Isnt what air racing October1981 119 F4t ISpn~-~et3M331494a
Edition: Model Aviation - 1981/10
Page Numbers: 36, 37, 38, 115, 118, 119
THOSE OF YOU have following thing bundled up coats gloves series may remember lead photos Part 1 big ear muffs useful ear warming back April issue showed us doing sound deadening first test b Beckman Kirby Crawford bi han ersfoi latest report intrepid team big engine testers installment look four popular Giant Scale engines interlude answer some questions submitted readers Part 4 runs made late November early December anyone thinks Virginia too far south get cold doesnt know about northern Virginia lead photo time shows Kirby trying function survive 4th July weekend same location reason mentioning empha size difference weather conditions between first test session fact other tests reported Parts 2 3 made earlier year conditions very similar first time session however temperature humidity 90s has affect engine performance dont try make direct comparisons earlier data did wind up rough idea effect different conditions Bobs Homelite 1 6 run during earlier sessions before variety props now available Dur ing earlier run cool weather engines best performance 16 lb thrust time around same prop Kolbo 20-5 produced 145 lb thrust decrease almost 10% reasonable assume engines will similarly affected differ ences due differing conditions cannot over emphasized please take adequately account reviewing results never intended make detailed comparisons performance different engines goal still try fill little gap infor mation about Big Bangers available have getting lot feedback about series happily positive have some good questions raised would like try answering comment hear often Static Kirby tweaks Evra during its break-in run Nothern Virginia weather July somewhat different thrust doesnt mean anything thing way November beginning projectreally counts performance air PropTZTZZD T ZDT Z T ZK T Engine16-416-516-616-616-818-618-618-618-818-818-818-1018-1020-520-6 Idle RPM2800280025002300230021002100210021002200210021002100 ETop RPM8400825075506600670069506700675069506000620067006000 Lb Thrust115121251251414121351375 1313514514 Idle RPM3100 2400 2900 3000 2500 2700 2700 2500 2500 2600 2300 2200 2800 2200 2700 RPM10800 9250 9200 8700 8150 6600 8000 7200 6650 6900 7150 5850 6150 6600 5950 Lb Thrust 125135135131412515145125141451275 1313514 Idle RPM 2300 2300 2300 2200 2100 2100 2100 2200 2100 2100 2100 2100 2100 2100 2100 Top RPM 9800 8950 9000 8800 8250 6800 7900 7300 7000 7100 7000 6200 6400 6900 6100 ILbThrust 10131351351413151551475 15141425 1451615 ho Idle RPMDDynathrustGGrish2200 2200 2200 2200 27002200 rTop RPMKKolboTTop FliteZZinger845086008950775080007650 iLb Thrust2021225222123 36 Model Aviation HOME LITE ENGINE DATA Displacement 16 Cu Supplier NAhomemade conversion Price NA Availability NA Mfg Homelite Original use Chainsaw Weight 3 lb 15 oz mount TEST DATA SUMMARY Max thrust 145 lb @ 6700 rpm Kolbo 20-5 prop 161 fuel mix @ 08 oz/min fuel consumption Accessories supplied Engine mount Homemade 3/32-in sheet alum Prop hub Homemade Recommended propeller Kolbo 20-5 Recommended fuel mix 161 Carburetor Make type Homeilte Waibro diaphragm pump Controls available Throttle choke Adjustments avail Idle set screw low-speed mixture Ignition Type Magneto mechanical points Spark plug Champion RCJ8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Grounding wire can added magneto Internal details Induction Reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Forged steel two pieces pressed together Bearings Caged needles front rear plus roller thrust bearing Conrod Stamped steel Bearings Rollerplain wrist pin Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firwall prop mount supplied 6-7/8 2 Prop rearmost point excluding rear shaft 5-1/8 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5 plug @ 5-1/8 behind prop 5 VertIcal dimensions thrust line a Up 5 plug @ 5-1/8 behind prop b Down 4 carb @ 3 behind prop 6 Horizontal extension thrust line 2 carb @ 3 behind prop 7 Propeller hub diameter 11/2 Bolt hore diameter NAsingle 5/16-24 bolt 8 Propeller washer 112 aluminum 9 MountIng bolt pattern NA Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat compact except radial extension intake 2Amount quality instructions NA 3Ease starting Cold GoodiS 20 flips b Hot GoodS 10 flips 4 Ease mounting control hook-up Radial mounting easily made straight throttle hook-up 5 Ease carburetor adjustments Difficult engine running 6 Vibration levels Fairly low better chainsaw-derived engines 7 Cowlability In-line-type cowls difficult because carb position 8 Crankshaft bearing slop Very noticeable agree second half first part Granted performance air really bottom line Peak performance air depends proper combination air frame engine propeller static thrust tests ground wont tell optimum combina tion thing finds building plane installing engine putting prop flying try different props different trim and/or balance airframe until get what want what engine cant hack What find engine would go cowl will just barely fly labor love spent year have got much power weight nose its bear fly answer change engine isnt quite simple changing prop can has done weve heard lot horror stories makes sense start out engine reasonable fit power requirements some Giant Scale modelers dont necessarily include ourselves no problem pick engine will ball park aircraft being modeled vast majority us however would nice have some reasonably simpleway judge capabilities various engines available match requirements kind data around would never have embarked what has turned out time-consuming exhaust ing fascinating project Once started static thrust reasonably simple way measure engine capability Before series done will give thoughts match specific requirements Another point has brought up know pitch prop really what manufacturer says answer that dont know really dont care dont think average modeler cares Again performance counts prop does job dont really care what exact pitch No manufacturer deliberately going carve label prop improperly say differences props cannot exist supposed same Wood stable raw material world density grain manufacturing tolerances can result variations prop next Wood raw material props nowadays molded glass-filled plastic props can have similar variations reason have used prop given make size tests since primarily looking engines props Someday may take look props see much vary since thing modeler really needs consis tency As long 20-8 prop given make same cares pitch eight inches eight-and-a-half inches subject props reader suggested should use props readily available modelers reference course Kolbo Korp prop has used tests prop few hand started whole thing size 20-5 selected Kirby several years ago set up first lIomelite engine has proven successful prop Kirbys Mr Mulligan Gulfhawk both using Homelite engine included testing just because Z D T Z D T Z G T ZTZ G Z GProp 20-620-820-820-820-1020-1020-1020-1222-622-622-822-822-1022-1022-12 ne 2100210021002200230023002300230024002400Idle RPMi 6550600055005500495048005250520057004500Top RPM 137514135131225 1213513514612LbThrust 25002400 2600Idle RPM 5700 59005000 5300Top RPM 251112Lb Thrust 2200 22002000 2000 2200 1900 2000 2000 2000 2000 2000 2000 2000 2000 2000 Idle RPMI 6900 61505700 5800 5300 5300 5500 4700 5500 5800 4950 5350 4500 4500 3200 Top RPM 1514515151451451475 12515145151512148Lb Thrust 23002200 2300 2100 2000Idle RPM 8350 74006950 7000 6500 6550Top RPM 4t 2422252325 2225 2222Lb Thrust ber1981 37 Homelite purrs away itsfuel consumption run Its eventual home will Sparrowhawk Bob ever finishes plane it has turned out better performers engines Granted readily available hobby shops fact may no longer available other hand obviously has something going it might pay off look After never looked used anything wasnt readily available everyone flying models would still small arrows use mufflers another subject keeps coming up As pointed out last installment since didnt have mufflers engines decided make runs Three current engines came mufflers looked like good time get some idea what effect Husky has small stamped steel muffler assembly part original chainsaw installation After completed other tests made two additional runs same prop First ran muffler made sure engine peaked Out put muffler re-tuned engine noticeable effect improvement engines idling top end however dropped about 100 rpm lost almost pound thrust Hustler Evra have similar mufflers made B&B Specialties mufflers have fairly large rectangular expansion chambers two good-sized tubular stacks unable run Hustler its muffler did run Evra described above Husky same improvement idle observed time high end engine picked up 200 rpm solid pound thrust Obviously smaller model engines right amount back pressure can actually increase engines output too much will rob power didnt try judge noise reduction wish thank following firms assistance part Big Bangers project Dynathrust Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 EWH Specialties Inc 3012 Avenue E East Arlington TX 76011 Super Hustler Mk II Giezendanner USA PO Box 818 Pottstown PA 19464 Grish Bros St John IN 46373 Hobby Lobby International 1 Franklin Pike Circle Brentwood TN 37027 Evra J&Z Products 25029 5 Vermont Ave Harbor City CA 90710 Zinger JC Enterprises 2251 SW 28th Terrace Ft Continued page 115 Accessories supplied Engine mount No available Prop hub YesMuffler No available Other Pull start cord pulley Additional items required excluding prop fuel tank None Recommended propeller specifIed Recommended fuel mix 201 Carburetor Make type Walbrodiaphragm pump Controls available Throttle Adjustments avail Idle set screw high low mixture Ignition Type Magnetoelectronic Spark plug Champion DJ-8J Recommended gap 0025 Magneto gap 0015 Point gap NA Kill disable system Grounding lug magneto Internal details Induction Rear reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Model engine style laminated counter-weight Bearings Two sealed ball bearings Conrod Twopiece stamped assembly Bearings Caged roller bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 7 2 Prop rearmost point excluding rear shaft 6-5/8 carb 3 Prop forwardmost point 11/16 magneto 4 Maximum extension thrust line 5-9/16 plug behind Drop 5 Vertical dimensions thrust line a Up 5-9/16 plug @ 33/4 behind prop b Down 1f4 flywheel @ 1 behind prop 6 Horizontal extension thrust line 1/4 flywheel @ 1 behind prop 7 Propeller hub diameter 11/2 Bolt hole diameter NAsingle 3/8-16 stud 8 Propeller washer 11/2 aluminum starter pulley 9 Mounting bolt pattern 2-5/8 sq centered thrust line Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Very compactlooks like oversize model eng 2 Amount quality instructions Very goodcovers needed info modelers viewpoint 3 Ease starting See notes 4 Ease mounting control hook-up Radial mountstraightfor ward throttle hook-up 5 Ease carburetor adjustments idle screw almost Inaccessible mixture easy 6 Vibration levels Extremely smooth speeds 7 Cowiability Excellent requires deep firewall 8 Crankshaft bearing slop None detectable 38 Model Aviation its battery ignition module strapped fuel tank test runs shaft extension just behind prop added facilitate prop changes during testing HUBBY LUBBY/EVHA 190 ENGINE DATA Displacement 19 Cu Ifl Supplier Hobby Lobby Intl Price $7900 Mount $19 Muf 1 Franklin Pike CIrclefler $1995 Brentwood TN 37027Avatlabllity Direct Mfg Piston Powered Products Original use Lawnboy weed whip Weight 4 lb 9 oz w/mt & muf TEST DATA SUMMARY Max thrust 15 lb @ 5700 rpm Zinger 206 prop 201 fuel mix @ 08 oz/min fuel consumption Dieter Schiuter world famous helicopter designer presents new MinI-5y & Super MIniBoy Show Seration Toledo & Macs Features 25 40 convertible Cyclone fan cooling No heat sinks needed Spinner starting Shaft drive tail rotor Factory researched & developed ChoIpof Rapping hinges Seepav Collective heads Rock table yet fully aerobatic World fv~ois Schluter quality Noi Ccl le9tIve 19995 CollectIve 22995 parts stock World standard metrics sob dealer order direct train UNSEAM Inc 2594 subsidiary MINIATURE AIRCRAFT North Orange Blossom Trail ndo FL 32804 Phone 30514221531 plans using small nails brads hold place dry Since bends gentle laminations will form quite easily After adding ribs wing add upper 1/4 square spar spar laminated two strips alsa Although wing assembled flat bench top spar does bend downward toward tips Wet both pieces water place lamination rib notches glue top lamination sure install 3/32 vertical grain spar webs shown plans add considerable strength wing tail surfaces built up p balsa t balsa tip segments After adding dihedral wing sheeting center section 1/16 sheet balsa can return fuselage complete wing saddle Glue 1/32 ply wing rest fuselage wing place provide proper shape Trim fuselage sheeting necessary get good wing-to-saddle fit Finally add heavy paper 1/16 balsa sheet wing fillet between fuselage ply saddle Dont use usual epoxy putty resin microballoons filletsthis materials too heavy Covering finishing Since trying make everything light possible best way go Super MonoKote similar lightweight covering bottom wing tail fuselage covered flat Dove Gray top plane covered flat Olive Drab upper surfaces camouflaged coat flat tan light earth enamel epoxy Suitable paints include Pactra Military Flats spray can RS Perfect Paint K&B Hobbypoxy Before spraying wipe surface MonoKote thinner acetone remove trace grease oil After camouflage pattern has painted mask spray roundels numbers use masking tape masking markings remove tape adjacent colors will probably lifted off made stencils newspaper just wet paper slide wet stencil place spray Simple worked fine Miscellaneous strnctural details standard called out plan such landing gear mounting blocks wing hold-on dowel nylon bolt nose cowl can built up balsa blocks sheet can make fiberglass keep light vacuum-form out sheet plastic Light cardboard landing gear covers attached landing gear legs silicone glue add final touch ready fly Flying Notes Before flying make sure CG right place wing has no warps wing big dont want slightest warp Reheating covering twisting offending surface simple cure advisable make some fast taxi tests before flight will help get feel airplane before first takeoff Begin takeoff rnn holding up elevator prevent nose-over throttle gunned As soon some speed built up relax neutral plane may fly off itself may require slight bit up elevator help rotation good duration Astro 15 dont indulge steep turns altitude-losing maneu vers Gentle wide turns will retain altitude give maximum flight time taxiing position back pits on-off switch used necessary very effective have motor servo set up full power forward throttle control halfway back gives cruise power full back stick shuts off motor Flying Spitfire beautiful experience Its unique mixture Scale Soaring RC Free Flight Dont look usual gas model performance though wish tear up skies better off usual noisy greasy bombs Im knocking kind flying mind since much RC fun fits category lightly-loaded Scale electric stuff new refreshing change pace dont forget ship also does nice relaxed job sport flying glow engine scale realism something like scale speed appreciated either case sport Spit calm summer evening something behold can build light youll love Big Bangers/BeckmanCrawford Continued page 38 Lauderdale FL 33312 Husky Top Flite Models Inc. l9JI Narragansett Ave Chicago IL 60639 Now lets get notes subjective com ments about four engines tested time Homelite 16 engine currently available directly usable form fairly easy convert several use around country have inquiries about itsince Kirby both use As far Continued page 118 October1981 115 IN 81 ITS RICKS R/C MODELS % INTRODUCING THE RICK STICK SUPREMETHE WEEKENDER FLITE BOX SPORTTRAINER- FULLYAEROBATICSIZE 124 x 12 x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 40 $4995 Pm-Cut Kit Hardware Landing Gear Full Length wood mdSPACE FOR 15 Drawer Cabinet 1-Gal Fuel Pre-Built Ready Fine Sand & Cover Battery Fuel Pump Power Panel Full Length Balsa Wood & Spruce SparsProp Bin Tool Tray Electric Hinged Surfaces Hardware HalIco GearStarter Cleaner Towels Nylon Bolts Tapped Bolt Gear&WingNo Other Like Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ICECKOavtO3OO Handling RIcws 1RODELS INC FL 33515I Kins Super coat Priner spray can$ 3 95 Point ThinnerS 4 95 Point Filters$ 1 49 Engine Oil$ 1 50 Engine Oil Kit519 00 Engine Rebuilding dleanrng Storage & Maintenance Kt$ 5 95 Kleen craay$ 1 95 Dust Masks$ 1 49 Send SASE fore 2 Box 481EIf avail FREE CatalogN-CRAFT As hand KY 41101yourlocalhobbyshop Dealers Invited i6O6i928-4763 order direct KY res add 5% sales tax AVIATION FILM CLASSICS ON VIDEOTAPE START YOUR OWN COLLECTION SF AVIATION FILRO ON EASY TO USE INEUPENOISE TIDEOCASOETTES ASIATION FILRS OF ALL TYPES FEATURES WAR DOCOPIENTARIES NEWSREEL ETC NOW ASAILABLE SN SlOES TAPESENT $1 00 FOR CATALSA UDS 1021J NSEPULVEDA MANHATTAS BCH CA 00256 Fiberglass Materials 5squareyards Choice oz cloth 12 Hour Epoxy Resin01500 per qt Mold ReleaseS3OO 16 02 Epoxy Primer K&BI03000 per gal Epoxy PaintThinner IK&BI01000 per gal Calitornia Residents add 6% Sales Tao Check Money Order onlySorry No COOs Bob Smith RIC Aircraft PO Box 33335 Granada Hills CA 91344 know Kirby did first conversion small chainsaw engine about four years ago bought chainsaw sale removed discarded saw parts cut away unneeded parts castiggs made prop adapter turned down flywheel fins business first engine went Nosen Mr Mulligan has flying beautifully three years has also flown Kirbys 28-lb Gulfhawk engine reported converted Bob use F9C-2 Sparrowhawk engine purchased local Homelite service center $6500 July August 1978 milling machine lathe used conversion work abso lutely necessary excess crankcase casting can cut away hacksaw file Kirby did turned out own prop adapters units available use Quadra will fit Homelite fins can left flywheel small weight penalty engine good size some smaller Giant Scale designs has proven realiable rugged power plant diffi cult cowl anything radial engine design intake manifold extending angle oppo site cylinder makes almost impossible get engine inline flat engine type cowls Note applications far have radials Kirbys 28-lb GulThawk far beyond what now consider reasonable engine size aircraft underpowered does fly little Homelite pulls through very realistic aerobatics Hobby Lobby/Evra 190 19 Cu engine has lot significant differences engines have worked up now has available three four years introduced fairly early continuing swell interest Giant Scale represents merging model airplane small engine techniques opinion has received less attention modelers truly deserves people Hobby Lobby took cylinder piston flywheel ignition system weed whip engine designed model-engine-type crankcase crankshaft complete mas sive ball bearings support shaft Walbro diaphragm pump carburetor mounted crankcase rear cover reed valve control induction result engine looks ways like larger version engines modelers have used years retains carburetor self-contained ignition have proven literally millions small gasoline engines crankcase design belongs Hobby Lobby engines manufac tured Piston Powered Products company makes original engine An electronic ignition system used engine starts easily once realize allow important factor engine must turning over approximately 400 rpm before ignition system will generate spark possible hand difficult point really clarified informa tion supplied early models engine current engines include starter pull rope pulley built prop washer tests used both pull rope Sullivan electric starter engine started immediately using either method never got pop out flipping hand Once pa t starting characteristics engine thee several items interestsome good some bad nicest things about Evra its in-line layout past weve talked about nice have engine no wider flywheel certainly tbe Evras case accomplished putting magneto right front cylinder intake rear crankcase cover course leads worst things about engine look data sheets youll find %-in between carburetor firewall carb does have built-in choke outin-the open test stand mounting hard properly choke engine built-in remotely operable choke would valuable addition engine As near could tell Evra never run briefly Most engines have worked have shown signs least short test runs decided give extra tankful break-in tendency heat up during operations indications like several other engines will need fair amount running really reach its peak ito low vibration easily cowled shape Evra should good engine lighter Giant Scale models especially original used flat in-line engine Husky 20 covered 23 Husky previous report isnt much say about slightly smaller one easily-cowled engines especially oiler pump removed other hand pump could very useful smoke system have room struck fairly flat power curve engine Husky 20 well made engine company very good reputation small engine field should able handle aircraft designed Quadra 118 Model Aviation will easier get some Super Hustler Mk II another engine has available some time test engine latest version understand significant differences ignition system have no personal experience earlier model cannot compare two Hustler significantly different Big Bangers Instead magneto uses onboard battery coil generate spark timing provided Hall Effect sensor electronic amplifier arrangement results cleaner looking engine since usual flywheel magneto coil gone carb front cylinder Hustler easily-cowled engine other hand ignition system requires relative myriad wires attendant increased probability failure test runs cut short problems couldnt straigtened out field First crimped-on battery connectors came off managed locate problem effect temporary fix Later engine began run rough refused start found lead soldered ground lug broken took care still no spark finally decided put off further attempts until could sort things Out As result did get some larger props have fuel consumption figures covered range props including recommended 20-8 figures show peak Zinger 20-6 will add data can collect Like Evra Hustler appears effort produce Big Banger configura tion closer what modelers have come expect certainly accomplishes wonder its worth added complication ignition system Schneider Races/Berliner Continued page 44 never have happened Lady Houston come forth contribution $500000 government refused foot bill Happily two S6B built John Boothman pilot # s-is 95 roared around course amazement thousands lined shores majestic demonstration aeronautics raised stature British aircraft industry its highest points wasnt very good racing Soon after race G H Stainforth became first person fly officially faster 400 mph set yet another Absolute World Speed Record time 4088 mph same S6B greastest seaplane raceand maybe greatest air racewas over Too bad French preparing several machines 1933 Schneider including pair Bernard Racers new 2000-hp Lorraine Radium engine Italians working bugs out sensational Macchi-Castoldi MC72 its tandem engines counterrotating propellers would later set 3-km speed record 441 mph still stands honor pilot Francesco Agello Though cheers soon died out lessons remained great mind Supermarine designer Mitchell came 1936 first thousands Spitfires Napier Lions Rolls Royce R engines came Merlin Curtiss D- 12 came Allison V-i 710 P-38 P-39 P-40 early P-Si ever-cleaner racers came flood knowledge about make airplanes go faster Isnt what air racing October1981 119 F4t ISpn~-~et3M331494a
Edition: Model Aviation - 1981/10
Page Numbers: 36, 37, 38, 115, 118, 119
THOSE OF YOU have following thing bundled up coats gloves series may remember lead photos Part 1 big ear muffs useful ear warming back April issue showed us doing sound deadening first test b Beckman Kirby Crawford bi han ersfoi latest report intrepid team big engine testers installment look four popular Giant Scale engines interlude answer some questions submitted readers Part 4 runs made late November early December anyone thinks Virginia too far south get cold doesnt know about northern Virginia lead photo time shows Kirby trying function survive 4th July weekend same location reason mentioning empha size difference weather conditions between first test session fact other tests reported Parts 2 3 made earlier year conditions very similar first time session however temperature humidity 90s has affect engine performance dont try make direct comparisons earlier data did wind up rough idea effect different conditions Bobs Homelite 1 6 run during earlier sessions before variety props now available Dur ing earlier run cool weather engines best performance 16 lb thrust time around same prop Kolbo 20-5 produced 145 lb thrust decrease almost 10% reasonable assume engines will similarly affected differ ences due differing conditions cannot over emphasized please take adequately account reviewing results never intended make detailed comparisons performance different engines goal still try fill little gap infor mation about Big Bangers available have getting lot feedback about series happily positive have some good questions raised would like try answering comment hear often Static Kirby tweaks Evra during its break-in run Nothern Virginia weather July somewhat different thrust doesnt mean anything thing way November beginning projectreally counts performance air PropTZTZZD T ZDT Z T ZK T Engine16-416-516-616-616-818-618-618-618-818-818-818-1018-1020-520-6 Idle RPM2800280025002300230021002100210021002200210021002100 ETop RPM8400825075506600670069506700675069506000620067006000 Lb Thrust115121251251414121351375 1313514514 Idle RPM3100 2400 2900 3000 2500 2700 2700 2500 2500 2600 2300 2200 2800 2200 2700 RPM10800 9250 9200 8700 8150 6600 8000 7200 6650 6900 7150 5850 6150 6600 5950 Lb Thrust 125135135131412515145125141451275 1313514 Idle RPM 2300 2300 2300 2200 2100 2100 2100 2200 2100 2100 2100 2100 2100 2100 2100 Top RPM 9800 8950 9000 8800 8250 6800 7900 7300 7000 7100 7000 6200 6400 6900 6100 ILbThrust 10131351351413151551475 15141425 1451615 ho Idle RPMDDynathrustGGrish2200 2200 2200 2200 27002200 rTop RPMKKolboTTop FliteZZinger845086008950775080007650 iLb Thrust2021225222123 36 Model Aviation HOME LITE ENGINE DATA Displacement 16 Cu Supplier NAhomemade conversion Price NA Availability NA Mfg Homelite Original use Chainsaw Weight 3 lb 15 oz mount TEST DATA SUMMARY Max thrust 145 lb @ 6700 rpm Kolbo 20-5 prop 161 fuel mix @ 08 oz/min fuel consumption Accessories supplied Engine mount Homemade 3/32-in sheet alum Prop hub Homemade Recommended propeller Kolbo 20-5 Recommended fuel mix 161 Carburetor Make type Homeilte Waibro diaphragm pump Controls available Throttle choke Adjustments avail Idle set screw low-speed mixture Ignition Type Magneto mechanical points Spark plug Champion RCJ8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Grounding wire can added magneto Internal details Induction Reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Forged steel two pieces pressed together Bearings Caged needles front rear plus roller thrust bearing Conrod Stamped steel Bearings Rollerplain wrist pin Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firwall prop mount supplied 6-7/8 2 Prop rearmost point excluding rear shaft 5-1/8 plug 3 Prop forwardmost point 1-3/8 magneto 4 Maximum extension thrust line 5 plug @ 5-1/8 behind prop 5 VertIcal dimensions thrust line a Up 5 plug @ 5-1/8 behind prop b Down 4 carb @ 3 behind prop 6 Horizontal extension thrust line 2 carb @ 3 behind prop 7 Propeller hub diameter 11/2 Bolt hore diameter NAsingle 5/16-24 bolt 8 Propeller washer 112 aluminum 9 MountIng bolt pattern NA Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat compact except radial extension intake 2Amount quality instructions NA 3Ease starting Cold GoodiS 20 flips b Hot GoodS 10 flips 4 Ease mounting control hook-up Radial mounting easily made straight throttle hook-up 5 Ease carburetor adjustments Difficult engine running 6 Vibration levels Fairly low better chainsaw-derived engines 7 Cowlability In-line-type cowls difficult because carb position 8 Crankshaft bearing slop Very noticeable agree second half first part Granted performance air really bottom line Peak performance air depends proper combination air frame engine propeller static thrust tests ground wont tell optimum combina tion thing finds building plane installing engine putting prop flying try different props different trim and/or balance airframe until get what want what engine cant hack What find engine would go cowl will just barely fly labor love spent year have got much power weight nose its bear fly answer change engine isnt quite simple changing prop can has done weve heard lot horror stories makes sense start out engine reasonable fit power requirements some Giant Scale modelers dont necessarily include ourselves no problem pick engine will ball park aircraft being modeled vast majority us however would nice have some reasonably simpleway judge capabilities various engines available match requirements kind data around would never have embarked what has turned out time-consuming exhaust ing fascinating project Once started static thrust reasonably simple way measure engine capability Before series done will give thoughts match specific requirements Another point has brought up know pitch prop really what manufacturer says answer that dont know really dont care dont think average modeler cares Again performance counts prop does job dont really care what exact pitch No manufacturer deliberately going carve label prop improperly say differences props cannot exist supposed same Wood stable raw material world density grain manufacturing tolerances can result variations prop next Wood raw material props nowadays molded glass-filled plastic props can have similar variations reason have used prop given make size tests since primarily looking engines props Someday may take look props see much vary since thing modeler really needs consis tency As long 20-8 prop given make same cares pitch eight inches eight-and-a-half inches subject props reader suggested should use props readily available modelers reference course Kolbo Korp prop has used tests prop few hand started whole thing size 20-5 selected Kirby several years ago set up first lIomelite engine has proven successful prop Kirbys Mr Mulligan Gulfhawk both using Homelite engine included testing just because Z D T Z D T Z G T ZTZ G Z GProp 20-620-820-820-820-1020-1020-1020-1222-622-622-822-822-1022-1022-12 ne 2100210021002200230023002300230024002400Idle RPMi 6550600055005500495048005250520057004500Top RPM 137514135131225 1213513514612LbThrust 25002400 2600Idle RPM 5700 59005000 5300Top RPM 251112Lb Thrust 2200 22002000 2000 2200 1900 2000 2000 2000 2000 2000 2000 2000 2000 2000 Idle RPMI 6900 61505700 5800 5300 5300 5500 4700 5500 5800 4950 5350 4500 4500 3200 Top RPM 1514515151451451475 12515145151512148Lb Thrust 23002200 2300 2100 2000Idle RPM 8350 74006950 7000 6500 6550Top RPM 4t 2422252325 2225 2222Lb Thrust ber1981 37 Homelite purrs away itsfuel consumption run Its eventual home will Sparrowhawk Bob ever finishes plane it has turned out better performers engines Granted readily available hobby shops fact may no longer available other hand obviously has something going it might pay off look After never looked used anything wasnt readily available everyone flying models would still small arrows use mufflers another subject keeps coming up As pointed out last installment since didnt have mufflers engines decided make runs Three current engines came mufflers looked like good time get some idea what effect Husky has small stamped steel muffler assembly part original chainsaw installation After completed other tests made two additional runs same prop First ran muffler made sure engine peaked Out put muffler re-tuned engine noticeable effect improvement engines idling top end however dropped about 100 rpm lost almost pound thrust Hustler Evra have similar mufflers made B&B Specialties mufflers have fairly large rectangular expansion chambers two good-sized tubular stacks unable run Hustler its muffler did run Evra described above Husky same improvement idle observed time high end engine picked up 200 rpm solid pound thrust Obviously smaller model engines right amount back pressure can actually increase engines output too much will rob power didnt try judge noise reduction wish thank following firms assistance part Big Bangers project Dynathrust Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 EWH Specialties Inc 3012 Avenue E East Arlington TX 76011 Super Hustler Mk II Giezendanner USA PO Box 818 Pottstown PA 19464 Grish Bros St John IN 46373 Hobby Lobby International 1 Franklin Pike Circle Brentwood TN 37027 Evra J&Z Products 25029 5 Vermont Ave Harbor City CA 90710 Zinger JC Enterprises 2251 SW 28th Terrace Ft Continued page 115 Accessories supplied Engine mount No available Prop hub YesMuffler No available Other Pull start cord pulley Additional items required excluding prop fuel tank None Recommended propeller specifIed Recommended fuel mix 201 Carburetor Make type Walbrodiaphragm pump Controls available Throttle Adjustments avail Idle set screw high low mixture Ignition Type Magnetoelectronic Spark plug Champion DJ-8J Recommended gap 0025 Magneto gap 0015 Point gap NA Kill disable system Grounding lug magneto Internal details Induction Rear reed valve Cylinder Cast aluminumchromed Piston rings Aluminum ring Crankshaft Model engine style laminated counter-weight Bearings Two sealed ball bearings Conrod Twopiece stamped assembly Bearings Caged roller bearings both ends Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 FIrewall prop mount supplied 7 2 Prop rearmost point excluding rear shaft 6-5/8 carb 3 Prop forwardmost point 11/16 magneto 4 Maximum extension thrust line 5-9/16 plug behind Drop 5 Vertical dimensions thrust line a Up 5-9/16 plug @ 33/4 behind prop b Down 1f4 flywheel @ 1 behind prop 6 Horizontal extension thrust line 1/4 flywheel @ 1 behind prop 7 Propeller hub diameter 11/2 Bolt hole diameter NAsingle 3/8-16 stud 8 Propeller washer 11/2 aluminum starter pulley 9 Mounting bolt pattern 2-5/8 sq centered thrust line Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Very compactlooks like oversize model eng 2 Amount quality instructions Very goodcovers needed info modelers viewpoint 3 Ease starting See notes 4 Ease mounting control hook-up Radial mountstraightfor ward throttle hook-up 5 Ease carburetor adjustments idle screw almost Inaccessible mixture easy 6 Vibration levels Extremely smooth speeds 7 Cowiability Excellent requires deep firewall 8 Crankshaft bearing slop None detectable 38 Model Aviation its battery ignition module strapped fuel tank test runs shaft extension just behind prop added facilitate prop changes during testing HUBBY LUBBY/EVHA 190 ENGINE DATA Displacement 19 Cu Ifl Supplier Hobby Lobby Intl Price $7900 Mount $19 Muf 1 Franklin Pike CIrclefler $1995 Brentwood TN 37027Avatlabllity Direct Mfg Piston Powered Products Original use Lawnboy weed whip Weight 4 lb 9 oz w/mt & muf TEST DATA SUMMARY Max thrust 15 lb @ 5700 rpm Zinger 206 prop 201 fuel mix @ 08 oz/min fuel consumption Dieter Schiuter world famous helicopter designer presents new MinI-5y & Super MIniBoy Show Seration Toledo & Macs Features 25 40 convertible Cyclone fan cooling No heat sinks needed Spinner starting Shaft drive tail rotor Factory researched & developed ChoIpof Rapping hinges Seepav Collective heads Rock table yet fully aerobatic World fv~ois Schluter quality Noi Ccl le9tIve 19995 CollectIve 22995 parts stock World standard metrics sob dealer order direct train UNSEAM Inc 2594 subsidiary MINIATURE AIRCRAFT North Orange Blossom Trail ndo FL 32804 Phone 30514221531 plans using small nails brads hold place dry Since bends gentle laminations will form quite easily After adding ribs wing add upper 1/4 square spar spar laminated two strips alsa Although wing assembled flat bench top spar does bend downward toward tips Wet both pieces water place lamination rib notches glue top lamination sure install 3/32 vertical grain spar webs shown plans add considerable strength wing tail surfaces built up p balsa t balsa tip segments After adding dihedral wing sheeting center section 1/16 sheet balsa can return fuselage complete wing saddle Glue 1/32 ply wing rest fuselage wing place provide proper shape Trim fuselage sheeting necessary get good wing-to-saddle fit Finally add heavy paper 1/16 balsa sheet wing fillet between fuselage ply saddle Dont use usual epoxy putty resin microballoons filletsthis materials too heavy Covering finishing Since trying make everything light possible best way go Super MonoKote similar lightweight covering bottom wing tail fuselage covered flat Dove Gray top plane covered flat Olive Drab upper surfaces camouflaged coat flat tan light earth enamel epoxy Suitable paints include Pactra Military Flats spray can RS Perfect Paint K&B Hobbypoxy Before spraying wipe surface MonoKote thinner acetone remove trace grease oil After camouflage pattern has painted mask spray roundels numbers use masking tape masking markings remove tape adjacent colors will probably lifted off made stencils newspaper just wet paper slide wet stencil place spray Simple worked fine Miscellaneous strnctural details standard called out plan such landing gear mounting blocks wing hold-on dowel nylon bolt nose cowl can built up balsa blocks sheet can make fiberglass keep light vacuum-form out sheet plastic Light cardboard landing gear covers attached landing gear legs silicone glue add final touch ready fly Flying Notes Before flying make sure CG right place wing has no warps wing big dont want slightest warp Reheating covering twisting offending surface simple cure advisable make some fast taxi tests before flight will help get feel airplane before first takeoff Begin takeoff rnn holding up elevator prevent nose-over throttle gunned As soon some speed built up relax neutral plane may fly off itself may require slight bit up elevator help rotation good duration Astro 15 dont indulge steep turns altitude-losing maneu vers Gentle wide turns will retain altitude give maximum flight time taxiing position back pits on-off switch used necessary very effective have motor servo set up full power forward throttle control halfway back gives cruise power full back stick shuts off motor Flying Spitfire beautiful experience Its unique mixture Scale Soaring RC Free Flight Dont look usual gas model performance though wish tear up skies better off usual noisy greasy bombs Im knocking kind flying mind since much RC fun fits category lightly-loaded Scale electric stuff new refreshing change pace dont forget ship also does nice relaxed job sport flying glow engine scale realism something like scale speed appreciated either case sport Spit calm summer evening something behold can build light youll love Big Bangers/BeckmanCrawford Continued page 38 Lauderdale FL 33312 Husky Top Flite Models Inc. l9JI Narragansett Ave Chicago IL 60639 Now lets get notes subjective com ments about four engines tested time Homelite 16 engine currently available directly usable form fairly easy convert several use around country have inquiries about itsince Kirby both use As far Continued page 118 October1981 115 IN 81 ITS RICKS R/C MODELS % INTRODUCING THE RICK STICK SUPREMETHE WEEKENDER FLITE BOX SPORTTRAINER- FULLYAEROBATICSIZE 124 x 12 x 18 PLYWOOD SANDED READY FOR PRIMER SEALER HARDWARE AND 15 DRAWER CABINET INCLUDED 40 $4995 Pm-Cut Kit Hardware Landing Gear Full Length wood mdSPACE FOR 15 Drawer Cabinet 1-Gal Fuel Pre-Built Ready Fine Sand & Cover Battery Fuel Pump Power Panel Full Length Balsa Wood & Spruce SparsProp Bin Tool Tray Electric Hinged Surfaces Hardware HalIco GearStarter Cleaner Towels Nylon Bolts Tapped Bolt Gear&WingNo Other Like Send SASE Free Brochure 0 Dealer Inquiries Invited 0 Florida Residents Add 4% Sales Tax ICECKOavtO3OO Handling RIcws 1RODELS INC FL 33515I Kins Super coat Priner spray can$ 3 95 Point ThinnerS 4 95 Point Filters$ 1 49 Engine Oil$ 1 50 Engine Oil Kit519 00 Engine Rebuilding dleanrng Storage & Maintenance Kt$ 5 95 Kleen craay$ 1 95 Dust Masks$ 1 49 Send SASE fore 2 Box 481EIf avail FREE CatalogN-CRAFT As hand KY 41101yourlocalhobbyshop Dealers Invited i6O6i928-4763 order direct KY res add 5% sales tax AVIATION FILM CLASSICS ON VIDEOTAPE START YOUR OWN COLLECTION SF AVIATION FILRO ON EASY TO USE INEUPENOISE TIDEOCASOETTES ASIATION FILRS OF ALL TYPES FEATURES WAR DOCOPIENTARIES NEWSREEL ETC NOW ASAILABLE SN SlOES TAPESENT $1 00 FOR CATALSA UDS 1021J NSEPULVEDA MANHATTAS BCH CA 00256 Fiberglass Materials 5squareyards Choice oz cloth 12 Hour Epoxy Resin01500 per qt Mold ReleaseS3OO 16 02 Epoxy Primer K&BI03000 per gal Epoxy PaintThinner IK&BI01000 per gal Calitornia Residents add 6% Sales Tao Check Money Order onlySorry No COOs Bob Smith RIC Aircraft PO Box 33335 Granada Hills CA 91344 know Kirby did first conversion small chainsaw engine about four years ago bought chainsaw sale removed discarded saw parts cut away unneeded parts castiggs made prop adapter turned down flywheel fins business first engine went Nosen Mr Mulligan has flying beautifully three years has also flown Kirbys 28-lb Gulfhawk engine reported converted Bob use F9C-2 Sparrowhawk engine purchased local Homelite service center $6500 July August 1978 milling machine lathe used conversion work abso lutely necessary excess crankcase casting can cut away hacksaw file Kirby did turned out own prop adapters units available use Quadra will fit Homelite fins can left flywheel small weight penalty engine good size some smaller Giant Scale designs has proven realiable rugged power plant diffi cult cowl anything radial engine design intake manifold extending angle oppo site cylinder makes almost impossible get engine inline flat engine type cowls Note applications far have radials Kirbys 28-lb GulThawk far beyond what now consider reasonable engine size aircraft underpowered does fly little Homelite pulls through very realistic aerobatics Hobby Lobby/Evra 190 19 Cu engine has lot significant differences engines have worked up now has available three four years introduced fairly early continuing swell interest Giant Scale represents merging model airplane small engine techniques opinion has received less attention modelers truly deserves people Hobby Lobby took cylinder piston flywheel ignition system weed whip engine designed model-engine-type crankcase crankshaft complete mas sive ball bearings support shaft Walbro diaphragm pump carburetor mounted crankcase rear cover reed valve control induction result engine looks ways like larger version engines modelers have used years retains carburetor self-contained ignition have proven literally millions small gasoline engines crankcase design belongs Hobby Lobby engines manufac tured Piston Powered Products company makes original engine An electronic ignition system used engine starts easily once realize allow important factor engine must turning over approximately 400 rpm before ignition system will generate spark possible hand difficult point really clarified informa tion supplied early models engine current engines include starter pull rope pulley built prop washer tests used both pull rope Sullivan electric starter engine started immediately using either method never got pop out flipping hand Once pa t starting characteristics engine thee several items interestsome good some bad nicest things about Evra its in-line layout past weve talked about nice have engine no wider flywheel certainly tbe Evras case accomplished putting magneto right front cylinder intake rear crankcase cover course leads worst things about engine look data sheets youll find %-in between carburetor firewall carb does have built-in choke outin-the open test stand mounting hard properly choke engine built-in remotely operable choke would valuable addition engine As near could tell Evra never run briefly Most engines have worked have shown signs least short test runs decided give extra tankful break-in tendency heat up during operations indications like several other engines will need fair amount running really reach its peak ito low vibration easily cowled shape Evra should good engine lighter Giant Scale models especially original used flat in-line engine Husky 20 covered 23 Husky previous report isnt much say about slightly smaller one easily-cowled engines especially oiler pump removed other hand pump could very useful smoke system have room struck fairly flat power curve engine Husky 20 well made engine company very good reputation small engine field should able handle aircraft designed Quadra 118 Model Aviation will easier get some Super Hustler Mk II another engine has available some time test engine latest version understand significant differences ignition system have no personal experience earlier model cannot compare two Hustler significantly different Big Bangers Instead magneto uses onboard battery coil generate spark timing provided Hall Effect sensor electronic amplifier arrangement results cleaner looking engine since usual flywheel magneto coil gone carb front cylinder Hustler easily-cowled engine other hand ignition system requires relative myriad wires attendant increased probability failure test runs cut short problems couldnt straigtened out field First crimped-on battery connectors came off managed locate problem effect temporary fix Later engine began run rough refused start found lead soldered ground lug broken took care still no spark finally decided put off further attempts until could sort things Out As result did get some larger props have fuel consumption figures covered range props including recommended 20-8 figures show peak Zinger 20-6 will add data can collect Like Evra Hustler appears effort produce Big Banger configura tion closer what modelers have come expect certainly accomplishes wonder its worth added complication ignition system Schneider Races/Berliner Continued page 44 never have happened Lady Houston come forth contribution $500000 government refused foot bill Happily two S6B built John Boothman pilot # s-is 95 roared around course amazement thousands lined shores majestic demonstration aeronautics raised stature British aircraft industry its highest points wasnt very good racing Soon after race G H Stainforth became first person fly officially faster 400 mph set yet another Absolute World Speed Record time 4088 mph same S6B greastest seaplane raceand maybe greatest air racewas over Too bad French preparing several machines 1933 Schneider including pair Bernard Racers new 2000-hp Lorraine Radium engine Italians working bugs out sensational Macchi-Castoldi MC72 its tandem engines counterrotating propellers would later set 3-km speed record 441 mph still stands honor pilot Francesco Agello Though cheers soon died out lessons remained great mind Supermarine designer Mitchell came 1936 first thousands Spitfires Napier Lions Rolls Royce R engines came Merlin Curtiss D- 12 came Allison V-i 710 P-38 P-39 P-40 early P-Si ever-cleaner racers came flood knowledge about make airplanes go faster Isnt what air racing October1981 119 F4t ISpn~-~et3M331494a