Big Bangers for Big Birds

Bob Beckman Kirby Crawford hi ban ersfoi Four new BBs time 1 28 Cu 5 Cu None market authors wrote last review Two US-made Germany Japan THIS INSTALLMENT Big Bangers able several reasons First three test runs made day almost exactly year after first run started series weather understandably very similar what first time around cold cloudy no rain atmosphere club flying field quite different however Last year couldnt take deep breath someone asking either What doing Are model engines time knew what doing about comment heard didnt know Giant Scale engines Well didnt know either have sometimes asked ourselves would have started whole thing known manytherewereorrather howmanytherewere going Actually four engines covered month werent available started hadnt thought people now supplying four new entries Giant Scale engine field sizewise span range smallest weve looked largest yet fourth run Contempo Magnum II several weeks after first three didnt have Magnum hand during earlier runs winter closed us before could test kept waiting break would let us get data needed didnt come until mid-February point club flying field nothing mud Bob conned neighbors sitting still couple hours engine noise test runs made front yard Contrary usual practice two engines brand new got Magnum Titan used tests reported both run supplier time got no other units available saw no indication internal modifications either case waiting snow go away spent some time trying analyze data have As have said times static thrust far full story about engine/prop combinations thing really counts what happens air theres just no way include variables PropD rzTZZZDTzDTZT Engine15-615616-416-516-616-616-818-518-618-618-6 118-818-818-818-10 N Idle RPM2000 2100 2400 2100 2200 2200 2100 2100 2100 2200 2000 11800 2100 2100 t ~JJ Top RPM8300 8650 9300 8350 8000 7800 7300 8000 6400 7100 66006200 6550 5150 rust 95958iir 111051125 111111511511512975 Idle RPM r 2200 2200 2200 2200 2200 2200 2200 2200 ETop RPM 9600 7650 8900 8200 7900 8100 8250 7200 Lb Thrust 18 18 20 205 185 22 205 21 Idle RPM Top RPM Lb Thrust Idle RPMDDynathrustGGrish ~Top_RPM Lb ThrustKKoIbo2 2 TTop FliteZZinger 34 Model Aviation Kirby Crawford braces himself pull-cord starting Magnum Dick Roe hangs Dick will helping future engine tests Wide array props behind run engines Supplier Roush Manufacturing PO Box 251 Sandyville OH 44671 Original use Backpack blower Price $15995 Availability Direct & Dealers Mfg Kioritz Japan Weight 4 lb 8 oz mci mount TEST DATA SUMMARY Max thrust 12 lb @ 6550 rpm Zinger 18-8 prop 501 fuel mix @ 063 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub YesMuffler No Other None Additional items required excluding prop fuel tank None Recommended propellerRecommended fuel mix 501 Bel Ray MCi Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug RCJ-8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Magneto grounding lead Internal details Induction Direct piston porting Cylinder Aluminum chromed Crankshaft Forged steel three pieces pressed together Bearings Caged ball bearings front rear Conrod Forged Steel Bearings Caged roller top bottom Dimimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-1/8 2 Prop rearmost point excluding rear shaft 6-1/8 3 Prop forwardmost point 11 crankcase 4 Maximum extension thrust line 8-11/16 plug @ 2/4 behind prop 5 Vertical dimensions thrust line a Up 8-11/16 plug 0 2/4 behind prop b Down 1/4 rear housing/mount @ 6-1/8 behind prop 6 Horizontal extension thrust line 31/4 carb mounting screws @ 2/4 behind prop 7 Propeller hub diameter 1/4 in Bolt hole diameter 3/s three 8-32 bolts 8Propeller washer 1/4 dIameter 3/16 thick aluminum 9Mounting bolt pattern 33/4 wide 21/2 high thrust line center Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Neat compact except rear flywheel hous ing obviously high quality 2 Amount quality instructions available report time 3 Ease starting a Cold ExcellentS 10 flips b Hot Excellentoften first flip 4 Ease mounting control hook-up Simple radial mount straight-through throttle hook-up 5 Ease carburetor adjustments Easy access engine running 6 Vibration levels Extremely smooth speeds 7 Cowlabillty Good except side-mounted carb 8 Crankshaft bearing slop None detectable test rig like However should some way use data very least selecting prop range props start sure weve really got yet well tell what thinking point welcome comments suggestions rest tried putting data several different forms seemed interesting plot thrust versus rpm prop Figure No 1 example what did using data Top Flite 20-6 dot repre sents observed thrust rpm engine prop first glance seems like very random collection some pretty reasonable assumptions can made First seems logical thrust produced pro peller going vary directly rpm Second variation should pretty linear over usable range As rpm increases cavita tion other effects will reduce props efficiency saw no clear evidence ever reached point props used random collection dots now begins take meaning can see definite trend lower left upper right across graph laying straightedge down taking eyeball average can draw idealized curve props performance point someone bound ask line represents props performance arent dots line Thats valid question answer cant control compensate variables involved example should obvious change air density will change thrust produced given rpm test runs made different times very different atmospheric conditions fact surprised data isnt scattered Plots made props combined manufacturer charts like Figure No 2 shown Zinger Handy Kioritz inductive tach Roush Manu facturing Unit senses counts spark plug discharges indicate rpm Z K T T Z 0 T Z G Z Z T ZProp 18-1020-520-620-6 20-8 20-820-820-1020-1020-1020-1220-1220-1422-622-6Engine 2000 2000 2000 le RPM 5650 6100 5400 Top RPM 151125Lb ThrustN 2200 2200 2200 2100 2200 2200 2000 1800 2000 2000 2100 1900 2000 2100 Idle RPM 7300 7800 7200 7700 7450 6550 6850 6150 6150 6250 5350 5900 5200 6500 6900 Top RPM ii 122522202152252052021161951722235LbThrust 2000 2000 2000 2000 Idle RPMH 7000 6500 7500 7600 Top RPM 2752525 275275Lb Thrust 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 Idle RPM 7700 7300 7250 7100 7050 7100 6400 6900 6400 7300 7400 Top RPM 27272527275275252725272725 Lb Thrust 0 June 198235 KIORITZ JR ENGINE DATA Displacement 128 cu Supplier Contempo Hobby Prod Price $23900 11611 Cantara StAvailability Dealers No Hollywood CAMfg Homelite 91605Weight 4 lb 6 oz Tatone Original use Super E-Z chainsaw muffler mount TEST DATA SUMMARY Max thrust 235 lb @ 6900 rpm Zinger 22-6 prop 501 fuel mix 0 12 oz/min fuel consumption Accessories eupplied Engine mount Flat plate full mount available Prop hub YesMuffler Noavailable option Other None Additional items required excluding prop fuel tank Rightangle throttle linkage Recommended PropellerRecommended fuel mix Carburetor Make type Walbro diaphragm pump Controls available Throttle choke Adjustments avail High low mixture idle stop Ignition Type Electronic Spark plug RDJ-6JRecommended gap 0025 Magneto gap 000800 12 inPoint gap NA Kill disable system Ground lead coil Internal Details Induction Reed valve Cylinder Aluminum chromed Piston rings Cast aluminum 2 rings Crankshaft Forged steel piece Bearings Roller front ball thrust bearing rear Conrod Forged steel two-piece Bearings Roller top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back tide 1 Firewall prop w/mount supplied 6 w/Tatone mt 2 Prop rearm ott point excluding rear shaftl 5 cylinder boss 3 Prop forwardmost point 23/32 magneto coil 4 Maximum extension thrust line 6 plug @ 3 behind prop 5 Vertical dimensions thrust line a Up 6 plug 0 3 behind prop b Down 1I4 flywheel 0 1-5/32 behind prop 6 Horizontal extension thrust line 3 carb mount 0 2/4 behind prop 7 Propeller hub dia 1-15/16 Bolt hole dia 1 6 8-32 bolts 8 Propeller washer 1-15/16 dia 3/16 thick aluminum 9 Mounting bolt pattern Rectangle 3-7/8 wide 1/4 high thrust line 1-3/8 up 1-13/16 left side Tatone mt Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat well made typical chainsaw-type engine 2Amount quality instructions available report time 3Ease starting See notes about pull-cord starting Cold Goodb Hot Good 4Ease mounting controlhook-up Flush firewall Tatone mount hole rear shaft required standard mount Throttle requires right-angle linkage 5Ease carb adjustmentE Difficult access rearfacing needles 6Vibration levels Typical chainsaw idle vibration levels ex cessive quite smooth higherspeeds 7Cowlability Goodbetter thanmost engines displacement 8Crankshaft bearing slop Quite noticeable props because different sizes Zinger anything else other brands showed essentially same characteristics Once data put form several interesting things became visible First note close 18-8 18-6 lines During test runs several times wondered about performance Zinger 18-6 compared same size Top Flite would often re-run other verify reading Apparently have two 18-8 Zingers ofthem labeled 18-6 possible manufacturing error might occur doubt could happen often other hand possible two prop sizes could quite close perform ance seems less likely view other data much interest fact plots form families curves mean groups lines have similar char acteristics case slope steepness line As result form pattern parallel lines across graph turns out propeller performance curves families diameter prop asked advance probably would have assumed such families would pitch rather diameter Looking Figure No 2 can see 16-in props have performance curves parallel other very steep other end range 24In prop lines also parallel much steeper dont really know yet what means Instinctively feel should some simple way use information John Burns Big Propellers article July 198 issue Mode Builder presented data procedures propeller selection extremely interesting feel limited use modelers open thoughts subject will come back next installment Now lets get subjective impressions four engines covered time Kioriti Jr smallest four another new engine Roush Manufacturing also offer 24 Kioritz Part III series reported MagAero 128 cu engine based weed-whip power plant Kioritz Jr very similar comes small backpack blower engines similar some parts interchangeable first glance seem almost identical get side-by-side turns out close mirror images other obvious difference spark plug position straight out top Jr instead pointing forward MagAero Internally tome significant differences result somewhat different performance didnt think would ever see smoother running engine MagAero may does seem have bit power Roush doesnt trim much off crankcase casting hut add some other goodies An adapter turns carb around have straight shot throttle linkage needles accessible addition replace rear-mounted flywheel cover casting own cover integral motor mount new cover shaves both weight overall length engine just PropTZGZGZZ ZZGZGZ ZZZ Engine22-B22-822-1022-1022-1222-1222-1422-1624-624-824824-924-1024-12 24-14 24-16 Idle RPM 2000 2000 1800 1800 1800 2100 1800 1600 1800 1600 1800 1600 ETop_RPM 5800 6200 5350 5350 4350 5100 4200 6000 4750 5250 4250 4750 4300 c LbThrust 225221820516205 1622185205 175 195 18 cIdle RPM2400220021002000190020002000200020001800200018002000200020002000 Top RPM 7300 7150 6700 6700 5900 6250 5750 5700 7000 6200 6700 5750 6100 5750 5200 5000 rust 2852825 275 2875 27292752825 2825 2833305 323175 2825 28 IdleR PM 2400 2400 2600 2400 2400 2400 2400 2400 2400 2200 2400 2400 2300 2200 2300 2200 isTop RPM 6950 7000 6600 6550 5650 6100 5600 5600 7100 6100 6500 5500 6000 5700 5000 4700 rust 282527527285 27285 275 27531 275325 285 315 315 2825 27 36 Model Aviation MAGNUM II ENGINE DATA Displacement 25 Cu TITAN ENGINE DATA Displacement 43 Cu Supplier Roush Manufacturing Price $28995 mci mt/muf PO Box 251Availability Direct & dealers Sandyville OH 44671Mfg Solo W Germany Original use Blower Weight 9 lb 8 oz mt/muf TEST DATA SUMMARY Max thrust 33 lb @ 6700 rpm Zinger 24-8 prop 501 fuel mix @2 184 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes Muffler Yes Other None Additional items required excluding prop fuel tank None Recommended propeller 22-12 24-16RCcOm fuel mix 501 BeIRay MG-i Carburetor Make type Tillotson diaphragm pump Controls available throttle choke Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug Champion RL85 Recommended gap 00250028 Magneto gap Fixed Point gap 0014 Kill disable system Magneto grounding lead Internal details Induction Direct piston porting Cylinder Cast aluminum steel sleeve Piston rings Aluminum 2 rings Crankshaft Forged steel Bearings Ball bearing front rear Conrod Forged steel Bearings Caged roller top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 7-1/16 2 Prop rearmost point excluding rear shaft 7-1/16 3 Prop forwardmost point 112 front cylinder fins 4 Max extension thrust line 7-15/16 plug @2 3 behind prop 5 Vertical dimensions thrust line a Up 7-5/8 plug @2 3 behind prop b Down 3-1/16 crankcase @ 4-3/8 behind prop 6 Horizontal extension thrust line 4-9/16 @2 32/4 behind prop 7 Prop hub diameter 1I4 Bolt hole dia 7/8 six 10-32 bolts 8 Propeller washer 114 diameter 2/ thick aluminum 9 Mounting bolt pattern Equilateral triangle 4-25/32 sides thrust line centered cylinder opposite apex Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Excellentfront end exceptionally clean 2Amount quality instructions Brief adequate 3Ease starting aCold Excellent3 5 flips b Hot Excellentoften first flip 4Ease mounting control hook-up Straightforward radial mount simple straight throttle linkage 5Ease carburetor adjustments Needles easily accessed en gine running 6Vibration levels Very low engine size 7Cowlability Very good side-mounted carb could cause problems narrow cowls 8Crankshaft bearing slop None detectable bit addition Kioritz Jr Roush offers parts convert MagAero essentially same engine Kioritz Jr fine engine lower end Giant Scale field Easy starting extremely smooth running two its Out standing features Magnum II thought new engines coming Japan take heart made USA comes Contempo Hobby Products based Homelite chainsaw engine Contempos arrangement Homelite has resulted what could bean impor tant precedent hobby Magnum ready-to-use Giant Scale engine backed nationwide organization warranty parts maintenance some maybe parts unique application will stocked Homelite parts depots 25 cu engine has 25% dis placement Quadra Its weight external dimensions however very close same will fit nicely aircraft designed use Quadra its extra power godsend designs externally similar size layout two engines have significant design differences Magnum util izes reed-valve induction electronic ignition Quadra piston-ported mechani cal points As chainsaw-derived en gines Magnum has rear shaft case bit longer can cut off shortened carburetor positioning un handy stock Quadra throttle takes some fancy linkage needles point straight back difficult get things annoying weve getting around Plo 06 116 16 520 ~1 m2j2DoS*6 June 198237 24 82* 6 22 8 22 S / Jo 1h41III /7 7/ / *0 1~~ Top Fl 20 6 V rgo-0 *1 Supplier Air rechPrice $34995 PO Box 9044Availability Direct Little Rock AR 72219Mfg Chrysler Outboard Corp Weight 7 lb 12 oz TEST DATA SUMMARY Max thrust 325 lb @ 6500 rpm Zinger 24-8 prop 281 fuel mix @ 207 oz/min fuel consumption Accessories supplied Engine mount Flat plate Prop hub YesMuffler No Other None Additional Items Required excluding prop fuel tank Right angle throttle linkage Recommended propeller 24-10 26-10 Recommended fuel mix 281 McCulloch Oil Carburetor Make type Tillotson diaphragm pump Controls available Throttle choke Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug RCJ-8Recommended gap 0030 Magneto gap 0010 inPoint gap 0015 Kill disable system Magneto grounding lead Internal details Induction Reed valve Cylinder Cast aluminum chromed Piston rings Aluminum 2 rings Crankshaft One-piece forged steel two counterweights Bearings Ball bearings front rear Conrod Two-piece forged steel Bearings Roller bearing top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 65/8 2 Prop rearmost point excluding rear shaft 6-7/8 exhaust boss 3 Prop forwardmost point 1-13/16 magneto 4 Maximum extension thrust line 6 plug @ 35/8 behind prop 5 Vertical dimensions thrust line a Up 614 plug @ 3-5/8 behind prop b Down 2-3/16 flywheel @ 23/16 behind prop 6 Horizontal extension thrust line 4-3/8 open choke plate @ 5 behind prop 7 Prop hub diameter 2 in Bolt hole dia Single 3/816 bolt 8 Prop washer 1/2 dia 1/16 thick steel 9 Mounting bolt pattern 3 high 4 wide thrust line centered Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Massive yet compact displacement 2 Amount quality instructions adequate makes good use engines original instructions supplementary air craft info 3 Ease starting Cold Good 1015 flips 0 Hot Excellent 23 flips 4 Ease mounting control hook-up Rear shaft extends behind mounting plate throttle requires right-angle linkage 5 Ease carburetor adjustments Rear-facing needles relatively accessible 6 Vibration levels shaker idling fairly smooth speed 7 Cowiability Easily cowled large models side-mounted carb may stick out 8 Crankshaft bearing slop Barely detectable years other engines Contempo working adapter rotate carb may available option Speaking options Tatone has made very nice mount muffler engine test runs made muffler usual practice After fuel consumption run put muffler see what effect high end rpm dropped 6900 6700 corresponding drop 15 lb thrust idle performance enhanced becoming smoother reliable results typical engines have run mufflers some starting problems test engine some reason never got pop turning over hand put Dynathrusts Dynahubs could use pull cord engine started right up have several reports around country about easy engine start loss explain experience plan make further tests will pass secret learn additional point should made Some people familiar origins Super Hustler have mistaken impression same engine both made Home lite similar displacement 25 26 cu completely different engines Magnum IIs operating characteristics typical chainsaw engines its displace ment smaller lighter particularly welcome alternative Quadra designs needing bit power Titan first West German engine show up Giant Scale power plant Its another blower engine exhibits smooth ness have come expect such engines Its construction similar Kioritz blower engines side-mounted carb exhaust rear-mounted flywheel another Continued page 97 Titan engine trim compact its43 cu size Manufactured West Germany B&B muffler comes standard equipment Cooling shroud part Westbends cylinder casting makes engine look bulky really doesnt add much weight 38 Model Aviation WESTBEND ENGINE DATA Displacement 50 Cu hurt score Duration next task once again Don Edberg scored 1000-point round Alex Bower still second Joe Wurts moved third Round three Distance again Edberg scored 1000 points aperfect score day Don now 303 points ahead second placer Larry Pettyjoltn Saturday night buffet-style banquet held Sands hotel contestants invited Sunday morning dawned gray cold field 630 21 0—a little cool Californian Sundays task would man-on-man Simulated Cross-Country actu ality task 10-lap Distance twist no maxed event scored man-on man someone maxed time 10 laps taken account fastest time 10 laps received 1000 points didnt max opponent did got buried understood object system still felt sad poor fellow could manage 934 laps nemesis got 10 feel man-on-man would have much sensible things considered Round four found Don Edberg 19th place round Despite losing 32 points Larry Pettyjohn Don still way out front Round five saw Don lose another 20 points Larry point top 10 moved finishing positions round six Don keep breaking airplane assured place top 10 Don won heat receiving another 1000 points just won second Two-Meter World Cup Bill Forrey moved 12th place first round take 2nd Larry Pettyjohn mere 14 points What ending third Two- Meter Cup now over except awards ceremony Members hobby industry very generous donations prizes Don Edberg received new Kraft 6channel radio two days work William Forrey latched onto new Futaba 7G radio outfit Third place finisher Larry Pettyjohn took home Ace Silver Seven Tx Fourth place Rick Schramack won Airtronics 6-channel system Rumor has next years contest may held Southern California dont plan attending Don Edberg needs competition Bangers Beckman- Crawford Continued page 38 Roush engine have equipped custom-designed rear cover mount 43 cu largest engines have handled its size however trim compact no flywheel bulk just behind prop will cowl easily side carb exhaust should no problem size aircraft its power will pull engine comes B&B muffler standard equipment test run muffler showed drop 50 rpm hrust idle already good butthe muffler did smooth out bit Titan easy-starting smooth-running powerful engine will particular interest big bird buffs hooked WW II fighter types Westbend 5 cu largest engine have tested date another US product have heard several individuals converting engine first time has offered ready-to-go state basic engine produced Chrysler Out board Corp have unable deter its original use laid out like chainsaw irs MORE THAN LUXURY. Just ask anyone uses precision engineered thoroughly tested on-board starters Lectra Starter Systems provide power reliability safety would expect product worthy fine R/C model Get behind propeller put finishing touch realism flying experience Once youve tried Eastcrafts Lectra Starter youil wonder ever got along EA STCRAFT Speciality Products June 198297 Dealer Inquiries InvitedSend $100 today complete catalog PO Box 508 Irwin PA 15642 412 864-4959 WARNING Tests have shown GloBee Glow Plugs habit forming Write Twinn-K Inc Dept GB3 Indianapolis Indiana 46231 ease seno me nyron Uriginals cataloglsl $500 Catalog price will credited towards initial purchase Name _____ Phone ____ Street RFD --____ Apt# ________ City____State ___-Zip _______ --I have enclosed check money order $. Please charge MC# ______ ___ Exp ___ VISAy _______ Iowa Residents Add 3% Sales Tax Prices Suhject Change Without Notice Send BYRON ORIGINALS PO Box 27g Ida Grove Iowa 51445 Ph 712-364-3165 #3 #4 #6 #8 SIZE #212 #312 #412 #612 #812 SIZE AMT/BAG #212 #312 #412 #612 #812 Remember Aerotrend source fine modeling hardware also offer complete line wood fiber glass field caddies other acces sories Send SASE free catalog todayDEALERS INVITED ERO TREND PRODUCTS 44W Prospect St New Haven CT06515 POWRWINCH perfect ampanion RETRIEVER Both units use special 4pole permanent nianet low current drain 12 volt ootor design also incurpor ates lightweight bit heavy duty welded painted steel fra features adjustable sotor amting plate insure proper drive tension R NCH has 0 Power handle either r unlimited sonsters anything between noid pro tected foot switch operation ed towline drun cunstruction ruired anti-kiting braking can readily disengaad al drus brake retrieval take-up onntrole 2000 feet braided nylon line tow ribban bell-bearing swivel bearing turnaround hub RETR EVER will eliminate losing turn fruency because long turnaraw tus retrieving lines Line crossings due wind shifts using sultiple winches will ne longer problan Best youll have launch-a--minute capability Other features inclnde -free operation due flycasting onde 0 Battery cables heavy duty clips feet braided nylon line ball bearing swivel Guide line aligmnt takeup imxle nd prevent line tangling drive shaft ORIER DIRECT FFCt4 *DAVEY UPmSYSTEMS CORPORATION ONE WOOD LANEMALVERNPA19355 2151644-0692 engine shafts out end case however shaft want use has left-hand thread prop adapter screws onto shaft locked place two cap screws single li-in prop bolt used con sider marginal size engine props will use certainly call six-bolt hub engine has exceptionally blocky look because cooling shroud cast cylinder along cooling fins shroud cant doing us harm its well worth few ounces adds Despite its size engine easily started handled well another power source well suited larger higher-performance models wish thank following firms cooperation Air Tech PO Box 9044 Little Rock AR 72219 Westbend Contempo Hobby Products 11611 Cantara St North Hollywood CA 91605 Magnum II Dynathrus Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 Grish Bros St John IN 46373 JZ Products 25029 So Vermont Ave Harbor City CA 90710 Zinger Roush Manufacturing PO Box 251 Sandy ville OH 44671 Kioritz Jr Titan Top Flite Models Inc 1901 Narragansett Ave Chicago IL 60639 AMA Building/Mankowski Continued page 39 Futaba Corp America2000 Hobby Publications1500 Donations $1000 K&B Manufacturing Midwest Products Dick McCoy Model Aero nautic Publications Baltek Corp Carl Gold berg Models Great Planes Distributing Co Sullivan Products World Engines Top Flite Models Pica Products Giezendanner USA Sig Manufacturing Sig Manufacturing Du-Bro Prod Inc Sterling Models Donations $500 MRCModel Rectifier Corp Airborne RC Distributors Dave Brown Products Montgomery Signs Sig Manufactur $22500 plus shiring * TRIrtJCItRY PRICES UNTIL JULY 31 1982 ing Co Swiss-Tex Emblems Byron Originals DN Mallory Distributors Inc Grober Co Donations up $100 Nico Engraving Tatone Products Flyline Models Dakon Hob bies Bernies Craft & Hobby Monogram Models JJ Levine & Associates California Hobby Distributors Wooden Specialty Co Pan American Distributors Crown Coca Cola Bottling Co Felix V Bass & Co Inc Polks Hobbies RC Soaring/Pruss Continued page 41 joiner housings metric wire plus linkage myriad catalog will justice catalog also lists imported kits Scale sport F3B slope fliers catalog costs $3 three bucks well spent Send Sailplane Factory Box 341 Red Lion PA 17356 phone 717 244-4508 Ask 1982 catalog item really caught eye set fittings high-start fitting comprised tapered piece resembles small plumb bob little over inch long high-start rubber stretched over larger end secured place short lock ring about 3/16 long hole exposed endof plumb bob ac commodates attach ring staking towline have ever wrapped fitting come loose knot rubber give out gadget answer model builders once awhile runs non-related Soaring item just has passed Ive run three books first two Frank Ebling compilation kit plans darn near everything has come out model box over past several years includes Sailplanes Pattern ships Free Flight Indoor Outdoor Rubber Control Line etc books great browsing through picking up con struction ideas just reminiscing piece-de- resistance isa book called Build98 Model Aviation HARDWARE

Bob Beckman Kirby Crawford hi ban ersfoi Four new BBs time 1 28 Cu 5 Cu None market authors wrote last review Two US-made Germany Japan THIS INSTALLMENT Big Bangers able several reasons First three test runs made day almost exactly year after first run started series weather understandably very similar what first time around cold cloudy no rain atmosphere club flying field quite different however Last year couldnt take deep breath someone asking either What doing Are model engines time knew what doing about comment heard didnt know Giant Scale engines Well didnt know either have sometimes asked ourselves would have started whole thing known manytherewereorrather howmanytherewere going Actually four engines covered month werent available started hadnt thought people now supplying four new entries Giant Scale engine field sizewise span range smallest weve looked largest yet fourth run Contempo Magnum II several weeks after first three didnt have Magnum hand during earlier runs winter closed us before could test kept waiting break would let us get data needed didnt come until mid-February point club flying field nothing mud Bob conned neighbors sitting still couple hours engine noise test runs made front yard Contrary usual practice two engines brand new got Magnum Titan used tests reported both run supplier time got no other units available saw no indication internal modifications either case waiting snow go away spent some time trying analyze data have As have said times static thrust far full story about engine/prop combinations thing really counts what happens air theres just no way include variables PropD rzTZZZDTzDTZT Engine15-615616-416-516-616-616-818-518-618-618-6 118-818-818-818-10 N Idle RPM2000 2100 2400 2100 2200 2200 2100 2100 2100 2200 2000 11800 2100 2100 t ~JJ Top RPM8300 8650 9300 8350 8000 7800 7300 8000 6400 7100 66006200 6550 5150 rust 95958iir 111051125 111111511511512975 Idle RPM r 2200 2200 2200 2200 2200 2200 2200 2200 ETop RPM 9600 7650 8900 8200 7900 8100 8250 7200 Lb Thrust 18 18 20 205 185 22 205 21 Idle RPM Top RPM Lb Thrust Idle RPMDDynathrustGGrish ~Top_RPM Lb ThrustKKoIbo2 2 TTop FliteZZinger 34 Model Aviation Kirby Crawford braces himself pull-cord starting Magnum Dick Roe hangs Dick will helping future engine tests Wide array props behind run engines Supplier Roush Manufacturing PO Box 251 Sandyville OH 44671 Original use Backpack blower Price $15995 Availability Direct & Dealers Mfg Kioritz Japan Weight 4 lb 8 oz mci mount TEST DATA SUMMARY Max thrust 12 lb @ 6550 rpm Zinger 18-8 prop 501 fuel mix @ 063 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub YesMuffler No Other None Additional items required excluding prop fuel tank None Recommended propellerRecommended fuel mix 501 Bel Ray MCi Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug RCJ-8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Magneto grounding lead Internal details Induction Direct piston porting Cylinder Aluminum chromed Crankshaft Forged steel three pieces pressed together Bearings Caged ball bearings front rear Conrod Forged Steel Bearings Caged roller top bottom Dimimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-1/8 2 Prop rearmost point excluding rear shaft 6-1/8 3 Prop forwardmost point 11 crankcase 4 Maximum extension thrust line 8-11/16 plug @ 2/4 behind prop 5 Vertical dimensions thrust line a Up 8-11/16 plug 0 2/4 behind prop b Down 1/4 rear housing/mount @ 6-1/8 behind prop 6 Horizontal extension thrust line 31/4 carb mounting screws @ 2/4 behind prop 7 Propeller hub diameter 1/4 in Bolt hole diameter 3/s three 8-32 bolts 8Propeller washer 1/4 dIameter 3/16 thick aluminum 9Mounting bolt pattern 33/4 wide 21/2 high thrust line center Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Neat compact except rear flywheel hous ing obviously high quality 2 Amount quality instructions available report time 3 Ease starting a Cold ExcellentS 10 flips b Hot Excellentoften first flip 4 Ease mounting control hook-up Simple radial mount straight-through throttle hook-up 5 Ease carburetor adjustments Easy access engine running 6 Vibration levels Extremely smooth speeds 7 Cowlabillty Good except side-mounted carb 8 Crankshaft bearing slop None detectable test rig like However should some way use data very least selecting prop range props start sure weve really got yet well tell what thinking point welcome comments suggestions rest tried putting data several different forms seemed interesting plot thrust versus rpm prop Figure No 1 example what did using data Top Flite 20-6 dot repre sents observed thrust rpm engine prop first glance seems like very random collection some pretty reasonable assumptions can made First seems logical thrust produced pro peller going vary directly rpm Second variation should pretty linear over usable range As rpm increases cavita tion other effects will reduce props efficiency saw no clear evidence ever reached point props used random collection dots now begins take meaning can see definite trend lower left upper right across graph laying straightedge down taking eyeball average can draw idealized curve props performance point someone bound ask line represents props performance arent dots line Thats valid question answer cant control compensate variables involved example should obvious change air density will change thrust produced given rpm test runs made different times very different atmospheric conditions fact surprised data isnt scattered Plots made props combined manufacturer charts like Figure No 2 shown Zinger Handy Kioritz inductive tach Roush Manu facturing Unit senses counts spark plug discharges indicate rpm Z K T T Z 0 T Z G Z Z T ZProp 18-1020-520-620-6 20-8 20-820-820-1020-1020-1020-1220-1220-1422-622-6Engine 2000 2000 2000 le RPM 5650 6100 5400 Top RPM 151125Lb ThrustN 2200 2200 2200 2100 2200 2200 2000 1800 2000 2000 2100 1900 2000 2100 Idle RPM 7300 7800 7200 7700 7450 6550 6850 6150 6150 6250 5350 5900 5200 6500 6900 Top RPM ii 122522202152252052021161951722235LbThrust 2000 2000 2000 2000 Idle RPMH 7000 6500 7500 7600 Top RPM 2752525 275275Lb Thrust 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 Idle RPM 7700 7300 7250 7100 7050 7100 6400 6900 6400 7300 7400 Top RPM 27272527275275252725272725 Lb Thrust 0 June 198235 KIORITZ JR ENGINE DATA Displacement 128 cu Supplier Contempo Hobby Prod Price $23900 11611 Cantara StAvailability Dealers No Hollywood CAMfg Homelite 91605Weight 4 lb 6 oz Tatone Original use Super E-Z chainsaw muffler mount TEST DATA SUMMARY Max thrust 235 lb @ 6900 rpm Zinger 22-6 prop 501 fuel mix 0 12 oz/min fuel consumption Accessories eupplied Engine mount Flat plate full mount available Prop hub YesMuffler Noavailable option Other None Additional items required excluding prop fuel tank Rightangle throttle linkage Recommended PropellerRecommended fuel mix Carburetor Make type Walbro diaphragm pump Controls available Throttle choke Adjustments avail High low mixture idle stop Ignition Type Electronic Spark plug RDJ-6JRecommended gap 0025 Magneto gap 000800 12 inPoint gap NA Kill disable system Ground lead coil Internal Details Induction Reed valve Cylinder Aluminum chromed Piston rings Cast aluminum 2 rings Crankshaft Forged steel piece Bearings Roller front ball thrust bearing rear Conrod Forged steel two-piece Bearings Roller top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back tide 1 Firewall prop w/mount supplied 6 w/Tatone mt 2 Prop rearm ott point excluding rear shaftl 5 cylinder boss 3 Prop forwardmost point 23/32 magneto coil 4 Maximum extension thrust line 6 plug @ 3 behind prop 5 Vertical dimensions thrust line a Up 6 plug 0 3 behind prop b Down 1I4 flywheel 0 1-5/32 behind prop 6 Horizontal extension thrust line 3 carb mount 0 2/4 behind prop 7 Propeller hub dia 1-15/16 Bolt hole dia 1 6 8-32 bolts 8 Propeller washer 1-15/16 dia 3/16 thick aluminum 9 Mounting bolt pattern Rectangle 3-7/8 wide 1/4 high thrust line 1-3/8 up 1-13/16 left side Tatone mt Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat well made typical chainsaw-type engine 2Amount quality instructions available report time 3Ease starting See notes about pull-cord starting Cold Goodb Hot Good 4Ease mounting controlhook-up Flush firewall Tatone mount hole rear shaft required standard mount Throttle requires right-angle linkage 5Ease carb adjustmentE Difficult access rearfacing needles 6Vibration levels Typical chainsaw idle vibration levels ex cessive quite smooth higherspeeds 7Cowlability Goodbetter thanmost engines displacement 8Crankshaft bearing slop Quite noticeable props because different sizes Zinger anything else other brands showed essentially same characteristics Once data put form several interesting things became visible First note close 18-8 18-6 lines During test runs several times wondered about performance Zinger 18-6 compared same size Top Flite would often re-run other verify reading Apparently have two 18-8 Zingers ofthem labeled 18-6 possible manufacturing error might occur doubt could happen often other hand possible two prop sizes could quite close perform ance seems less likely view other data much interest fact plots form families curves mean groups lines have similar char acteristics case slope steepness line As result form pattern parallel lines across graph turns out propeller performance curves families diameter prop asked advance probably would have assumed such families would pitch rather diameter Looking Figure No 2 can see 16-in props have performance curves parallel other very steep other end range 24In prop lines also parallel much steeper dont really know yet what means Instinctively feel should some simple way use information John Burns Big Propellers article July 198 issue Mode Builder presented data procedures propeller selection extremely interesting feel limited use modelers open thoughts subject will come back next installment Now lets get subjective impressions four engines covered time Kioriti Jr smallest four another new engine Roush Manufacturing also offer 24 Kioritz Part III series reported MagAero 128 cu engine based weed-whip power plant Kioritz Jr very similar comes small backpack blower engines similar some parts interchangeable first glance seem almost identical get side-by-side turns out close mirror images other obvious difference spark plug position straight out top Jr instead pointing forward MagAero Internally tome significant differences result somewhat different performance didnt think would ever see smoother running engine MagAero may does seem have bit power Roush doesnt trim much off crankcase casting hut add some other goodies An adapter turns carb around have straight shot throttle linkage needles accessible addition replace rear-mounted flywheel cover casting own cover integral motor mount new cover shaves both weight overall length engine just PropTZGZGZZ ZZGZGZ ZZZ Engine22-B22-822-1022-1022-1222-1222-1422-1624-624-824824-924-1024-12 24-14 24-16 Idle RPM 2000 2000 1800 1800 1800 2100 1800 1600 1800 1600 1800 1600 ETop_RPM 5800 6200 5350 5350 4350 5100 4200 6000 4750 5250 4250 4750 4300 c LbThrust 225221820516205 1622185205 175 195 18 cIdle RPM2400220021002000190020002000200020001800200018002000200020002000 Top RPM 7300 7150 6700 6700 5900 6250 5750 5700 7000 6200 6700 5750 6100 5750 5200 5000 rust 2852825 275 2875 27292752825 2825 2833305 323175 2825 28 IdleR PM 2400 2400 2600 2400 2400 2400 2400 2400 2400 2200 2400 2400 2300 2200 2300 2200 isTop RPM 6950 7000 6600 6550 5650 6100 5600 5600 7100 6100 6500 5500 6000 5700 5000 4700 rust 282527527285 27285 275 27531 275325 285 315 315 2825 27 36 Model Aviation MAGNUM II ENGINE DATA Displacement 25 Cu TITAN ENGINE DATA Displacement 43 Cu Supplier Roush Manufacturing Price $28995 mci mt/muf PO Box 251Availability Direct & dealers Sandyville OH 44671Mfg Solo W Germany Original use Blower Weight 9 lb 8 oz mt/muf TEST DATA SUMMARY Max thrust 33 lb @ 6700 rpm Zinger 24-8 prop 501 fuel mix @2 184 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes Muffler Yes Other None Additional items required excluding prop fuel tank None Recommended propeller 22-12 24-16RCcOm fuel mix 501 BeIRay MG-i Carburetor Make type Tillotson diaphragm pump Controls available throttle choke Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug Champion RL85 Recommended gap 00250028 Magneto gap Fixed Point gap 0014 Kill disable system Magneto grounding lead Internal details Induction Direct piston porting Cylinder Cast aluminum steel sleeve Piston rings Aluminum 2 rings Crankshaft Forged steel Bearings Ball bearing front rear Conrod Forged steel Bearings Caged roller top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 7-1/16 2 Prop rearmost point excluding rear shaft 7-1/16 3 Prop forwardmost point 112 front cylinder fins 4 Max extension thrust line 7-15/16 plug @2 3 behind prop 5 Vertical dimensions thrust line a Up 7-5/8 plug @2 3 behind prop b Down 3-1/16 crankcase @ 4-3/8 behind prop 6 Horizontal extension thrust line 4-9/16 @2 32/4 behind prop 7 Prop hub diameter 1I4 Bolt hole dia 7/8 six 10-32 bolts 8 Propeller washer 114 diameter 2/ thick aluminum 9 Mounting bolt pattern Equilateral triangle 4-25/32 sides thrust line centered cylinder opposite apex Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Excellentfront end exceptionally clean 2Amount quality instructions Brief adequate 3Ease starting aCold Excellent3 5 flips b Hot Excellentoften first flip 4Ease mounting control hook-up Straightforward radial mount simple straight throttle linkage 5Ease carburetor adjustments Needles easily accessed en gine running 6Vibration levels Very low engine size 7Cowlability Very good side-mounted carb could cause problems narrow cowls 8Crankshaft bearing slop None detectable bit addition Kioritz Jr Roush offers parts convert MagAero essentially same engine Kioritz Jr fine engine lower end Giant Scale field Easy starting extremely smooth running two its Out standing features Magnum II thought new engines coming Japan take heart made USA comes Contempo Hobby Products based Homelite chainsaw engine Contempos arrangement Homelite has resulted what could bean impor tant precedent hobby Magnum ready-to-use Giant Scale engine backed nationwide organization warranty parts maintenance some maybe parts unique application will stocked Homelite parts depots 25 cu engine has 25% dis placement Quadra Its weight external dimensions however very close same will fit nicely aircraft designed use Quadra its extra power godsend designs externally similar size layout two engines have significant design differences Magnum util izes reed-valve induction electronic ignition Quadra piston-ported mechani cal points As chainsaw-derived en gines Magnum has rear shaft case bit longer can cut off shortened carburetor positioning un handy stock Quadra throttle takes some fancy linkage needles point straight back difficult get things annoying weve getting around Plo 06 116 16 520 ~1 m2j2DoS*6 June 198237 24 82* 6 22 8 22 S / Jo 1h41III /7 7/ / *0 1~~ Top Fl 20 6 V rgo-0 *1 Supplier Air rechPrice $34995 PO Box 9044Availability Direct Little Rock AR 72219Mfg Chrysler Outboard Corp Weight 7 lb 12 oz TEST DATA SUMMARY Max thrust 325 lb @ 6500 rpm Zinger 24-8 prop 281 fuel mix @ 207 oz/min fuel consumption Accessories supplied Engine mount Flat plate Prop hub YesMuffler No Other None Additional Items Required excluding prop fuel tank Right angle throttle linkage Recommended propeller 24-10 26-10 Recommended fuel mix 281 McCulloch Oil Carburetor Make type Tillotson diaphragm pump Controls available Throttle choke Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug RCJ-8Recommended gap 0030 Magneto gap 0010 inPoint gap 0015 Kill disable system Magneto grounding lead Internal details Induction Reed valve Cylinder Cast aluminum chromed Piston rings Aluminum 2 rings Crankshaft One-piece forged steel two counterweights Bearings Ball bearings front rear Conrod Two-piece forged steel Bearings Roller bearing top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 65/8 2 Prop rearmost point excluding rear shaft 6-7/8 exhaust boss 3 Prop forwardmost point 1-13/16 magneto 4 Maximum extension thrust line 6 plug @ 35/8 behind prop 5 Vertical dimensions thrust line a Up 614 plug @ 3-5/8 behind prop b Down 2-3/16 flywheel @ 23/16 behind prop 6 Horizontal extension thrust line 4-3/8 open choke plate @ 5 behind prop 7 Prop hub diameter 2 in Bolt hole dia Single 3/816 bolt 8 Prop washer 1/2 dia 1/16 thick steel 9 Mounting bolt pattern 3 high 4 wide thrust line centered Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Massive yet compact displacement 2 Amount quality instructions adequate makes good use engines original instructions supplementary air craft info 3 Ease starting Cold Good 1015 flips 0 Hot Excellent 23 flips 4 Ease mounting control hook-up Rear shaft extends behind mounting plate throttle requires right-angle linkage 5 Ease carburetor adjustments Rear-facing needles relatively accessible 6 Vibration levels shaker idling fairly smooth speed 7 Cowiability Easily cowled large models side-mounted carb may stick out 8 Crankshaft bearing slop Barely detectable years other engines Contempo working adapter rotate carb may available option Speaking options Tatone has made very nice mount muffler engine test runs made muffler usual practice After fuel consumption run put muffler see what effect high end rpm dropped 6900 6700 corresponding drop 15 lb thrust idle performance enhanced becoming smoother reliable results typical engines have run mufflers some starting problems test engine some reason never got pop turning over hand put Dynathrusts Dynahubs could use pull cord engine started right up have several reports around country about easy engine start loss explain experience plan make further tests will pass secret learn additional point should made Some people familiar origins Super Hustler have mistaken impression same engine both made Home lite similar displacement 25 26 cu completely different engines Magnum IIs operating characteristics typical chainsaw engines its displace ment smaller lighter particularly welcome alternative Quadra designs needing bit power Titan first West German engine show up Giant Scale power plant Its another blower engine exhibits smooth ness have come expect such engines Its construction similar Kioritz blower engines side-mounted carb exhaust rear-mounted flywheel another Continued page 97 Titan engine trim compact its43 cu size Manufactured West Germany B&B muffler comes standard equipment Cooling shroud part Westbends cylinder casting makes engine look bulky really doesnt add much weight 38 Model Aviation WESTBEND ENGINE DATA Displacement 50 Cu hurt score Duration next task once again Don Edberg scored 1000-point round Alex Bower still second Joe Wurts moved third Round three Distance again Edberg scored 1000 points aperfect score day Don now 303 points ahead second placer Larry Pettyjoltn Saturday night buffet-style banquet held Sands hotel contestants invited Sunday morning dawned gray cold field 630 21 0—a little cool Californian Sundays task would man-on-man Simulated Cross-Country actu ality task 10-lap Distance twist no maxed event scored man-on man someone maxed time 10 laps taken account fastest time 10 laps received 1000 points didnt max opponent did got buried understood object system still felt sad poor fellow could manage 934 laps nemesis got 10 feel man-on-man would have much sensible things considered Round four found Don Edberg 19th place round Despite losing 32 points Larry Pettyjohn Don still way out front Round five saw Don lose another 20 points Larry point top 10 moved finishing positions round six Don keep breaking airplane assured place top 10 Don won heat receiving another 1000 points just won second Two-Meter World Cup Bill Forrey moved 12th place first round take 2nd Larry Pettyjohn mere 14 points What ending third Two- Meter Cup now over except awards ceremony Members hobby industry very generous donations prizes Don Edberg received new Kraft 6channel radio two days work William Forrey latched onto new Futaba 7G radio outfit Third place finisher Larry Pettyjohn took home Ace Silver Seven Tx Fourth place Rick Schramack won Airtronics 6-channel system Rumor has next years contest may held Southern California dont plan attending Don Edberg needs competition Bangers Beckman- Crawford Continued page 38 Roush engine have equipped custom-designed rear cover mount 43 cu largest engines have handled its size however trim compact no flywheel bulk just behind prop will cowl easily side carb exhaust should no problem size aircraft its power will pull engine comes B&B muffler standard equipment test run muffler showed drop 50 rpm hrust idle already good butthe muffler did smooth out bit Titan easy-starting smooth-running powerful engine will particular interest big bird buffs hooked WW II fighter types Westbend 5 cu largest engine have tested date another US product have heard several individuals converting engine first time has offered ready-to-go state basic engine produced Chrysler Out board Corp have unable deter its original use laid out like chainsaw irs MORE THAN LUXURY. Just ask anyone uses precision engineered thoroughly tested on-board starters Lectra Starter Systems provide power reliability safety would expect product worthy fine R/C model Get behind propeller put finishing touch realism flying experience Once youve tried Eastcrafts Lectra Starter youil wonder ever got along EA STCRAFT Speciality Products June 198297 Dealer Inquiries InvitedSend $100 today complete catalog PO Box 508 Irwin PA 15642 412 864-4959 WARNING Tests have shown GloBee Glow Plugs habit forming Write Twinn-K Inc Dept GB3 Indianapolis Indiana 46231 ease seno me nyron Uriginals cataloglsl $500 Catalog price will credited towards initial purchase Name _____ Phone ____ Street RFD --____ Apt# ________ City____State ___-Zip _______ --I have enclosed check money order $. Please charge MC# ______ ___ Exp ___ VISAy _______ Iowa Residents Add 3% Sales Tax Prices Suhject Change Without Notice Send BYRON ORIGINALS PO Box 27g Ida Grove Iowa 51445 Ph 712-364-3165 #3 #4 #6 #8 SIZE #212 #312 #412 #612 #812 SIZE AMT/BAG #212 #312 #412 #612 #812 Remember Aerotrend source fine modeling hardware also offer complete line wood fiber glass field caddies other acces sories Send SASE free catalog todayDEALERS INVITED ERO TREND PRODUCTS 44W Prospect St New Haven CT06515 POWRWINCH perfect ampanion RETRIEVER Both units use special 4pole permanent nianet low current drain 12 volt ootor design also incurpor ates lightweight bit heavy duty welded painted steel fra features adjustable sotor amting plate insure proper drive tension R NCH has 0 Power handle either r unlimited sonsters anything between noid pro tected foot switch operation ed towline drun cunstruction ruired anti-kiting braking can readily disengaad al drus brake retrieval take-up onntrole 2000 feet braided nylon line tow ribban bell-bearing swivel bearing turnaround hub RETR EVER will eliminate losing turn fruency because long turnaraw tus retrieving lines Line crossings due wind shifts using sultiple winches will ne longer problan Best youll have launch-a--minute capability Other features inclnde -free operation due flycasting onde 0 Battery cables heavy duty clips feet braided nylon line ball bearing swivel Guide line aligmnt takeup imxle nd prevent line tangling drive shaft ORIER DIRECT FFCt4 *DAVEY UPmSYSTEMS CORPORATION ONE WOOD LANEMALVERNPA19355 2151644-0692 engine shafts out end case however shaft want use has left-hand thread prop adapter screws onto shaft locked place two cap screws single li-in prop bolt used con sider marginal size engine props will use certainly call six-bolt hub engine has exceptionally blocky look because cooling shroud cast cylinder along cooling fins shroud cant doing us harm its well worth few ounces adds Despite its size engine easily started handled well another power source well suited larger higher-performance models wish thank following firms cooperation Air Tech PO Box 9044 Little Rock AR 72219 Westbend Contempo Hobby Products 11611 Cantara St North Hollywood CA 91605 Magnum II Dynathrus Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 Grish Bros St John IN 46373 JZ Products 25029 So Vermont Ave Harbor City CA 90710 Zinger Roush Manufacturing PO Box 251 Sandy ville OH 44671 Kioritz Jr Titan Top Flite Models Inc 1901 Narragansett Ave Chicago IL 60639 AMA Building/Mankowski Continued page 39 Futaba Corp America2000 Hobby Publications1500 Donations $1000 K&B Manufacturing Midwest Products Dick McCoy Model Aero nautic Publications Baltek Corp Carl Gold berg Models Great Planes Distributing Co Sullivan Products World Engines Top Flite Models Pica Products Giezendanner USA Sig Manufacturing Sig Manufacturing Du-Bro Prod Inc Sterling Models Donations $500 MRCModel Rectifier Corp Airborne RC Distributors Dave Brown Products Montgomery Signs Sig Manufactur $22500 plus shiring * TRIrtJCItRY PRICES UNTIL JULY 31 1982 ing Co Swiss-Tex Emblems Byron Originals DN Mallory Distributors Inc Grober Co Donations up $100 Nico Engraving Tatone Products Flyline Models Dakon Hob bies Bernies Craft & Hobby Monogram Models JJ Levine & Associates California Hobby Distributors Wooden Specialty Co Pan American Distributors Crown Coca Cola Bottling Co Felix V Bass & Co Inc Polks Hobbies RC Soaring/Pruss Continued page 41 joiner housings metric wire plus linkage myriad catalog will justice catalog also lists imported kits Scale sport F3B slope fliers catalog costs $3 three bucks well spent Send Sailplane Factory Box 341 Red Lion PA 17356 phone 717 244-4508 Ask 1982 catalog item really caught eye set fittings high-start fitting comprised tapered piece resembles small plumb bob little over inch long high-start rubber stretched over larger end secured place short lock ring about 3/16 long hole exposed endof plumb bob ac commodates attach ring staking towline have ever wrapped fitting come loose knot rubber give out gadget answer model builders once awhile runs non-related Soaring item just has passed Ive run three books first two Frank Ebling compilation kit plans darn near everything has come out model box over past several years includes Sailplanes Pattern ships Free Flight Indoor Outdoor Rubber Control Line etc books great browsing through picking up con struction ideas just reminiscing piece-de- resistance isa book called Build98 Model Aviation HARDWARE

Bob Beckman Kirby Crawford hi ban ersfoi Four new BBs time 1 28 Cu 5 Cu None market authors wrote last review Two US-made Germany Japan THIS INSTALLMENT Big Bangers able several reasons First three test runs made day almost exactly year after first run started series weather understandably very similar what first time around cold cloudy no rain atmosphere club flying field quite different however Last year couldnt take deep breath someone asking either What doing Are model engines time knew what doing about comment heard didnt know Giant Scale engines Well didnt know either have sometimes asked ourselves would have started whole thing known manytherewereorrather howmanytherewere going Actually four engines covered month werent available started hadnt thought people now supplying four new entries Giant Scale engine field sizewise span range smallest weve looked largest yet fourth run Contempo Magnum II several weeks after first three didnt have Magnum hand during earlier runs winter closed us before could test kept waiting break would let us get data needed didnt come until mid-February point club flying field nothing mud Bob conned neighbors sitting still couple hours engine noise test runs made front yard Contrary usual practice two engines brand new got Magnum Titan used tests reported both run supplier time got no other units available saw no indication internal modifications either case waiting snow go away spent some time trying analyze data have As have said times static thrust far full story about engine/prop combinations thing really counts what happens air theres just no way include variables PropD rzTZZZDTzDTZT Engine15-615616-416-516-616-616-818-518-618-618-6 118-818-818-818-10 N Idle RPM2000 2100 2400 2100 2200 2200 2100 2100 2100 2200 2000 11800 2100 2100 t ~JJ Top RPM8300 8650 9300 8350 8000 7800 7300 8000 6400 7100 66006200 6550 5150 rust 95958iir 111051125 111111511511512975 Idle RPM r 2200 2200 2200 2200 2200 2200 2200 2200 ETop RPM 9600 7650 8900 8200 7900 8100 8250 7200 Lb Thrust 18 18 20 205 185 22 205 21 Idle RPM Top RPM Lb Thrust Idle RPMDDynathrustGGrish ~Top_RPM Lb ThrustKKoIbo2 2 TTop FliteZZinger 34 Model Aviation Kirby Crawford braces himself pull-cord starting Magnum Dick Roe hangs Dick will helping future engine tests Wide array props behind run engines Supplier Roush Manufacturing PO Box 251 Sandyville OH 44671 Original use Backpack blower Price $15995 Availability Direct & Dealers Mfg Kioritz Japan Weight 4 lb 8 oz mci mount TEST DATA SUMMARY Max thrust 12 lb @ 6550 rpm Zinger 18-8 prop 501 fuel mix @ 063 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub YesMuffler No Other None Additional items required excluding prop fuel tank None Recommended propellerRecommended fuel mix 501 Bel Ray MCi Carburetor Make type Waibro diaphragm pump Controls available Throttle Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug RCJ-8Recommended gap 0025 Magneto gap 0010 inPoint gap 0015 Kill disable system Magneto grounding lead Internal details Induction Direct piston porting Cylinder Aluminum chromed Crankshaft Forged steel three pieces pressed together Bearings Caged ball bearings front rear Conrod Forged Steel Bearings Caged roller top bottom Dimimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 6-1/8 2 Prop rearmost point excluding rear shaft 6-1/8 3 Prop forwardmost point 11 crankcase 4 Maximum extension thrust line 8-11/16 plug @ 2/4 behind prop 5 Vertical dimensions thrust line a Up 8-11/16 plug 0 2/4 behind prop b Down 1/4 rear housing/mount @ 6-1/8 behind prop 6 Horizontal extension thrust line 31/4 carb mounting screws @ 2/4 behind prop 7 Propeller hub diameter 1/4 in Bolt hole diameter 3/s three 8-32 bolts 8Propeller washer 1/4 dIameter 3/16 thick aluminum 9Mounting bolt pattern 33/4 wide 21/2 high thrust line center Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Neat compact except rear flywheel hous ing obviously high quality 2 Amount quality instructions available report time 3 Ease starting a Cold ExcellentS 10 flips b Hot Excellentoften first flip 4 Ease mounting control hook-up Simple radial mount straight-through throttle hook-up 5 Ease carburetor adjustments Easy access engine running 6 Vibration levels Extremely smooth speeds 7 Cowlabillty Good except side-mounted carb 8 Crankshaft bearing slop None detectable test rig like However should some way use data very least selecting prop range props start sure weve really got yet well tell what thinking point welcome comments suggestions rest tried putting data several different forms seemed interesting plot thrust versus rpm prop Figure No 1 example what did using data Top Flite 20-6 dot repre sents observed thrust rpm engine prop first glance seems like very random collection some pretty reasonable assumptions can made First seems logical thrust produced pro peller going vary directly rpm Second variation should pretty linear over usable range As rpm increases cavita tion other effects will reduce props efficiency saw no clear evidence ever reached point props used random collection dots now begins take meaning can see definite trend lower left upper right across graph laying straightedge down taking eyeball average can draw idealized curve props performance point someone bound ask line represents props performance arent dots line Thats valid question answer cant control compensate variables involved example should obvious change air density will change thrust produced given rpm test runs made different times very different atmospheric conditions fact surprised data isnt scattered Plots made props combined manufacturer charts like Figure No 2 shown Zinger Handy Kioritz inductive tach Roush Manu facturing Unit senses counts spark plug discharges indicate rpm Z K T T Z 0 T Z G Z Z T ZProp 18-1020-520-620-6 20-8 20-820-820-1020-1020-1020-1220-1220-1422-622-6Engine 2000 2000 2000 le RPM 5650 6100 5400 Top RPM 151125Lb ThrustN 2200 2200 2200 2100 2200 2200 2000 1800 2000 2000 2100 1900 2000 2100 Idle RPM 7300 7800 7200 7700 7450 6550 6850 6150 6150 6250 5350 5900 5200 6500 6900 Top RPM ii 122522202152252052021161951722235LbThrust 2000 2000 2000 2000 Idle RPMH 7000 6500 7500 7600 Top RPM 2752525 275275Lb Thrust 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 Idle RPM 7700 7300 7250 7100 7050 7100 6400 6900 6400 7300 7400 Top RPM 27272527275275252725272725 Lb Thrust 0 June 198235 KIORITZ JR ENGINE DATA Displacement 128 cu Supplier Contempo Hobby Prod Price $23900 11611 Cantara StAvailability Dealers No Hollywood CAMfg Homelite 91605Weight 4 lb 6 oz Tatone Original use Super E-Z chainsaw muffler mount TEST DATA SUMMARY Max thrust 235 lb @ 6900 rpm Zinger 22-6 prop 501 fuel mix 0 12 oz/min fuel consumption Accessories eupplied Engine mount Flat plate full mount available Prop hub YesMuffler Noavailable option Other None Additional items required excluding prop fuel tank Rightangle throttle linkage Recommended PropellerRecommended fuel mix Carburetor Make type Walbro diaphragm pump Controls available Throttle choke Adjustments avail High low mixture idle stop Ignition Type Electronic Spark plug RDJ-6JRecommended gap 0025 Magneto gap 000800 12 inPoint gap NA Kill disable system Ground lead coil Internal Details Induction Reed valve Cylinder Aluminum chromed Piston rings Cast aluminum 2 rings Crankshaft Forged steel piece Bearings Roller front ball thrust bearing rear Conrod Forged steel two-piece Bearings Roller top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back tide 1 Firewall prop w/mount supplied 6 w/Tatone mt 2 Prop rearm ott point excluding rear shaftl 5 cylinder boss 3 Prop forwardmost point 23/32 magneto coil 4 Maximum extension thrust line 6 plug @ 3 behind prop 5 Vertical dimensions thrust line a Up 6 plug 0 3 behind prop b Down 1I4 flywheel 0 1-5/32 behind prop 6 Horizontal extension thrust line 3 carb mount 0 2/4 behind prop 7 Propeller hub dia 1-15/16 Bolt hole dia 1 6 8-32 bolts 8 Propeller washer 1-15/16 dia 3/16 thick aluminum 9 Mounting bolt pattern Rectangle 3-7/8 wide 1/4 high thrust line 1-3/8 up 1-13/16 left side Tatone mt Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Neat well made typical chainsaw-type engine 2Amount quality instructions available report time 3Ease starting See notes about pull-cord starting Cold Goodb Hot Good 4Ease mounting controlhook-up Flush firewall Tatone mount hole rear shaft required standard mount Throttle requires right-angle linkage 5Ease carb adjustmentE Difficult access rearfacing needles 6Vibration levels Typical chainsaw idle vibration levels ex cessive quite smooth higherspeeds 7Cowlability Goodbetter thanmost engines displacement 8Crankshaft bearing slop Quite noticeable props because different sizes Zinger anything else other brands showed essentially same characteristics Once data put form several interesting things became visible First note close 18-8 18-6 lines During test runs several times wondered about performance Zinger 18-6 compared same size Top Flite would often re-run other verify reading Apparently have two 18-8 Zingers ofthem labeled 18-6 possible manufacturing error might occur doubt could happen often other hand possible two prop sizes could quite close perform ance seems less likely view other data much interest fact plots form families curves mean groups lines have similar char acteristics case slope steepness line As result form pattern parallel lines across graph turns out propeller performance curves families diameter prop asked advance probably would have assumed such families would pitch rather diameter Looking Figure No 2 can see 16-in props have performance curves parallel other very steep other end range 24In prop lines also parallel much steeper dont really know yet what means Instinctively feel should some simple way use information John Burns Big Propellers article July 198 issue Mode Builder presented data procedures propeller selection extremely interesting feel limited use modelers open thoughts subject will come back next installment Now lets get subjective impressions four engines covered time Kioriti Jr smallest four another new engine Roush Manufacturing also offer 24 Kioritz Part III series reported MagAero 128 cu engine based weed-whip power plant Kioritz Jr very similar comes small backpack blower engines similar some parts interchangeable first glance seem almost identical get side-by-side turns out close mirror images other obvious difference spark plug position straight out top Jr instead pointing forward MagAero Internally tome significant differences result somewhat different performance didnt think would ever see smoother running engine MagAero may does seem have bit power Roush doesnt trim much off crankcase casting hut add some other goodies An adapter turns carb around have straight shot throttle linkage needles accessible addition replace rear-mounted flywheel cover casting own cover integral motor mount new cover shaves both weight overall length engine just PropTZGZGZZ ZZGZGZ ZZZ Engine22-B22-822-1022-1022-1222-1222-1422-1624-624-824824-924-1024-12 24-14 24-16 Idle RPM 2000 2000 1800 1800 1800 2100 1800 1600 1800 1600 1800 1600 ETop_RPM 5800 6200 5350 5350 4350 5100 4200 6000 4750 5250 4250 4750 4300 c LbThrust 225221820516205 1622185205 175 195 18 cIdle RPM2400220021002000190020002000200020001800200018002000200020002000 Top RPM 7300 7150 6700 6700 5900 6250 5750 5700 7000 6200 6700 5750 6100 5750 5200 5000 rust 2852825 275 2875 27292752825 2825 2833305 323175 2825 28 IdleR PM 2400 2400 2600 2400 2400 2400 2400 2400 2400 2200 2400 2400 2300 2200 2300 2200 isTop RPM 6950 7000 6600 6550 5650 6100 5600 5600 7100 6100 6500 5500 6000 5700 5000 4700 rust 282527527285 27285 275 27531 275325 285 315 315 2825 27 36 Model Aviation MAGNUM II ENGINE DATA Displacement 25 Cu TITAN ENGINE DATA Displacement 43 Cu Supplier Roush Manufacturing Price $28995 mci mt/muf PO Box 251Availability Direct & dealers Sandyville OH 44671Mfg Solo W Germany Original use Blower Weight 9 lb 8 oz mt/muf TEST DATA SUMMARY Max thrust 33 lb @ 6700 rpm Zinger 24-8 prop 501 fuel mix @2 184 oz/min fuel consumption Accessories supplied Engine mount Yes Prop hub Yes Muffler Yes Other None Additional items required excluding prop fuel tank None Recommended propeller 22-12 24-16RCcOm fuel mix 501 BeIRay MG-i Carburetor Make type Tillotson diaphragm pump Controls available throttle choke Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug Champion RL85 Recommended gap 00250028 Magneto gap Fixed Point gap 0014 Kill disable system Magneto grounding lead Internal details Induction Direct piston porting Cylinder Cast aluminum steel sleeve Piston rings Aluminum 2 rings Crankshaft Forged steel Bearings Ball bearing front rear Conrod Forged steel Bearings Caged roller top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 7-1/16 2 Prop rearmost point excluding rear shaft 7-1/16 3 Prop forwardmost point 112 front cylinder fins 4 Max extension thrust line 7-15/16 plug @2 3 behind prop 5 Vertical dimensions thrust line a Up 7-5/8 plug @2 3 behind prop b Down 3-1/16 crankcase @ 4-3/8 behind prop 6 Horizontal extension thrust line 4-9/16 @2 32/4 behind prop 7 Prop hub diameter 1I4 Bolt hole dia 7/8 six 10-32 bolts 8 Propeller washer 114 diameter 2/ thick aluminum 9 Mounting bolt pattern Equilateral triangle 4-25/32 sides thrust line centered cylinder opposite apex Subjective items following beyond ability measure di rectly offered opinions what worth 1Overall appearance Excellentfront end exceptionally clean 2Amount quality instructions Brief adequate 3Ease starting aCold Excellent3 5 flips b Hot Excellentoften first flip 4Ease mounting control hook-up Straightforward radial mount simple straight throttle linkage 5Ease carburetor adjustments Needles easily accessed en gine running 6Vibration levels Very low engine size 7Cowlability Very good side-mounted carb could cause problems narrow cowls 8Crankshaft bearing slop None detectable bit addition Kioritz Jr Roush offers parts convert MagAero essentially same engine Kioritz Jr fine engine lower end Giant Scale field Easy starting extremely smooth running two its Out standing features Magnum II thought new engines coming Japan take heart made USA comes Contempo Hobby Products based Homelite chainsaw engine Contempos arrangement Homelite has resulted what could bean impor tant precedent hobby Magnum ready-to-use Giant Scale engine backed nationwide organization warranty parts maintenance some maybe parts unique application will stocked Homelite parts depots 25 cu engine has 25% dis placement Quadra Its weight external dimensions however very close same will fit nicely aircraft designed use Quadra its extra power godsend designs externally similar size layout two engines have significant design differences Magnum util izes reed-valve induction electronic ignition Quadra piston-ported mechani cal points As chainsaw-derived en gines Magnum has rear shaft case bit longer can cut off shortened carburetor positioning un handy stock Quadra throttle takes some fancy linkage needles point straight back difficult get things annoying weve getting around Plo 06 116 16 520 ~1 m2j2DoS*6 June 198237 24 82* 6 22 8 22 S / Jo 1h41III /7 7/ / *0 1~~ Top Fl 20 6 V rgo-0 *1 Supplier Air rechPrice $34995 PO Box 9044Availability Direct Little Rock AR 72219Mfg Chrysler Outboard Corp Weight 7 lb 12 oz TEST DATA SUMMARY Max thrust 325 lb @ 6500 rpm Zinger 24-8 prop 281 fuel mix @ 207 oz/min fuel consumption Accessories supplied Engine mount Flat plate Prop hub YesMuffler No Other None Additional Items Required excluding prop fuel tank Right angle throttle linkage Recommended propeller 24-10 26-10 Recommended fuel mix 281 McCulloch Oil Carburetor Make type Tillotson diaphragm pump Controls available Throttle choke Adjustments avail High low mixture idle stop Ignition Type Mechanical points Spark plug RCJ-8Recommended gap 0030 Magneto gap 0010 inPoint gap 0015 Kill disable system Magneto grounding lead Internal details Induction Reed valve Cylinder Cast aluminum chromed Piston rings Aluminum 2 rings Crankshaft One-piece forged steel two counterweights Bearings Ball bearings front rear Conrod Two-piece forged steel Bearings Roller bearing top bottom Dimensions Orientation dimensions looking forward along crankshaft upright engine Prop refers propeller back side 1 Firewall prop mount supplied 65/8 2 Prop rearmost point excluding rear shaft 6-7/8 exhaust boss 3 Prop forwardmost point 1-13/16 magneto 4 Maximum extension thrust line 6 plug @ 35/8 behind prop 5 Vertical dimensions thrust line a Up 614 plug @ 3-5/8 behind prop b Down 2-3/16 flywheel @ 23/16 behind prop 6 Horizontal extension thrust line 4-3/8 open choke plate @ 5 behind prop 7 Prop hub diameter 2 in Bolt hole dia Single 3/816 bolt 8 Prop washer 1/2 dia 1/16 thick steel 9 Mounting bolt pattern 3 high 4 wide thrust line centered Subjective items following beyond ability measure di rectly offered opinions what worth 1 Overall appearance Massive yet compact displacement 2 Amount quality instructions adequate makes good use engines original instructions supplementary air craft info 3 Ease starting Cold Good 1015 flips 0 Hot Excellent 23 flips 4 Ease mounting control hook-up Rear shaft extends behind mounting plate throttle requires right-angle linkage 5 Ease carburetor adjustments Rear-facing needles relatively accessible 6 Vibration levels shaker idling fairly smooth speed 7 Cowiability Easily cowled large models side-mounted carb may stick out 8 Crankshaft bearing slop Barely detectable years other engines Contempo working adapter rotate carb may available option Speaking options Tatone has made very nice mount muffler engine test runs made muffler usual practice After fuel consumption run put muffler see what effect high end rpm dropped 6900 6700 corresponding drop 15 lb thrust idle performance enhanced becoming smoother reliable results typical engines have run mufflers some starting problems test engine some reason never got pop turning over hand put Dynathrusts Dynahubs could use pull cord engine started right up have several reports around country about easy engine start loss explain experience plan make further tests will pass secret learn additional point should made Some people familiar origins Super Hustler have mistaken impression same engine both made Home lite similar displacement 25 26 cu completely different engines Magnum IIs operating characteristics typical chainsaw engines its displace ment smaller lighter particularly welcome alternative Quadra designs needing bit power Titan first West German engine show up Giant Scale power plant Its another blower engine exhibits smooth ness have come expect such engines Its construction similar Kioritz blower engines side-mounted carb exhaust rear-mounted flywheel another Continued page 97 Titan engine trim compact its43 cu size Manufactured West Germany B&B muffler comes standard equipment Cooling shroud part Westbends cylinder casting makes engine look bulky really doesnt add much weight 38 Model Aviation WESTBEND ENGINE DATA Displacement 50 Cu hurt score Duration next task once again Don Edberg scored 1000-point round Alex Bower still second Joe Wurts moved third Round three Distance again Edberg scored 1000 points aperfect score day Don now 303 points ahead second placer Larry Pettyjoltn Saturday night buffet-style banquet held Sands hotel contestants invited Sunday morning dawned gray cold field 630 21 0—a little cool Californian Sundays task would man-on-man Simulated Cross-Country actu ality task 10-lap Distance twist no maxed event scored man-on man someone maxed time 10 laps taken account fastest time 10 laps received 1000 points didnt max opponent did got buried understood object system still felt sad poor fellow could manage 934 laps nemesis got 10 feel man-on-man would have much sensible things considered Round four found Don Edberg 19th place round Despite losing 32 points Larry Pettyjohn Don still way out front Round five saw Don lose another 20 points Larry point top 10 moved finishing positions round six Don keep breaking airplane assured place top 10 Don won heat receiving another 1000 points just won second Two-Meter World Cup Bill Forrey moved 12th place first round take 2nd Larry Pettyjohn mere 14 points What ending third Two- Meter Cup now over except awards ceremony Members hobby industry very generous donations prizes Don Edberg received new Kraft 6channel radio two days work William Forrey latched onto new Futaba 7G radio outfit Third place finisher Larry Pettyjohn took home Ace Silver Seven Tx Fourth place Rick Schramack won Airtronics 6-channel system Rumor has next years contest may held Southern California dont plan attending Don Edberg needs competition Bangers Beckman- Crawford Continued page 38 Roush engine have equipped custom-designed rear cover mount 43 cu largest engines have handled its size however trim compact no flywheel bulk just behind prop will cowl easily side carb exhaust should no problem size aircraft its power will pull engine comes B&B muffler standard equipment test run muffler showed drop 50 rpm hrust idle already good butthe muffler did smooth out bit Titan easy-starting smooth-running powerful engine will particular interest big bird buffs hooked WW II fighter types Westbend 5 cu largest engine have tested date another US product have heard several individuals converting engine first time has offered ready-to-go state basic engine produced Chrysler Out board Corp have unable deter its original use laid out like chainsaw irs MORE THAN LUXURY. Just ask anyone uses precision engineered thoroughly tested on-board starters Lectra Starter Systems provide power reliability safety would expect product worthy fine R/C model Get behind propeller put finishing touch realism flying experience Once youve tried Eastcrafts Lectra Starter youil wonder ever got along EA STCRAFT Speciality Products June 198297 Dealer Inquiries InvitedSend $100 today complete catalog PO Box 508 Irwin PA 15642 412 864-4959 WARNING Tests have shown GloBee Glow Plugs habit forming Write Twinn-K Inc Dept GB3 Indianapolis Indiana 46231 ease seno me nyron Uriginals cataloglsl $500 Catalog price will credited towards initial purchase Name _____ Phone ____ Street RFD --____ Apt# ________ City____State ___-Zip _______ --I have enclosed check money order $. Please charge MC# ______ ___ Exp ___ VISAy _______ Iowa Residents Add 3% Sales Tax Prices Suhject Change Without Notice Send BYRON ORIGINALS PO Box 27g Ida Grove Iowa 51445 Ph 712-364-3165 #3 #4 #6 #8 SIZE #212 #312 #412 #612 #812 SIZE AMT/BAG #212 #312 #412 #612 #812 Remember Aerotrend source fine modeling hardware also offer complete line wood fiber glass field caddies other acces sories Send SASE free catalog todayDEALERS INVITED ERO TREND PRODUCTS 44W Prospect St New Haven CT06515 POWRWINCH perfect ampanion RETRIEVER Both units use special 4pole permanent nianet low current drain 12 volt ootor design also incurpor ates lightweight bit heavy duty welded painted steel fra features adjustable sotor amting plate insure proper drive tension R NCH has 0 Power handle either r unlimited sonsters anything between noid pro tected foot switch operation ed towline drun cunstruction ruired anti-kiting braking can readily disengaad al drus brake retrieval take-up onntrole 2000 feet braided nylon line tow ribban bell-bearing swivel bearing turnaround hub RETR EVER will eliminate losing turn fruency because long turnaraw tus retrieving lines Line crossings due wind shifts using sultiple winches will ne longer problan Best youll have launch-a--minute capability Other features inclnde -free operation due flycasting onde 0 Battery cables heavy duty clips feet braided nylon line ball bearing swivel Guide line aligmnt takeup imxle nd prevent line tangling drive shaft ORIER DIRECT FFCt4 *DAVEY UPmSYSTEMS CORPORATION ONE WOOD LANEMALVERNPA19355 2151644-0692 engine shafts out end case however shaft want use has left-hand thread prop adapter screws onto shaft locked place two cap screws single li-in prop bolt used con sider marginal size engine props will use certainly call six-bolt hub engine has exceptionally blocky look because cooling shroud cast cylinder along cooling fins shroud cant doing us harm its well worth few ounces adds Despite its size engine easily started handled well another power source well suited larger higher-performance models wish thank following firms cooperation Air Tech PO Box 9044 Little Rock AR 72219 Westbend Contempo Hobby Products 11611 Cantara St North Hollywood CA 91605 Magnum II Dynathrus Props Inc 2541 NE 11th Ct Pompano Beach FL 33062 Grish Bros St John IN 46373 JZ Products 25029 So Vermont Ave Harbor City CA 90710 Zinger Roush Manufacturing PO Box 251 Sandy ville OH 44671 Kioritz Jr Titan Top Flite Models Inc 1901 Narragansett Ave Chicago IL 60639 AMA Building/Mankowski Continued page 39 Futaba Corp America2000 Hobby Publications1500 Donations $1000 K&B Manufacturing Midwest Products Dick McCoy Model Aero nautic Publications Baltek Corp Carl Gold berg Models Great Planes Distributing Co Sullivan Products World Engines Top Flite Models Pica Products Giezendanner USA Sig Manufacturing Sig Manufacturing Du-Bro Prod Inc Sterling Models Donations $500 MRCModel Rectifier Corp Airborne RC Distributors Dave Brown Products Montgomery Signs Sig Manufactur $22500 plus shiring * TRIrtJCItRY PRICES UNTIL JULY 31 1982 ing Co Swiss-Tex Emblems Byron Originals DN Mallory Distributors Inc Grober Co Donations up $100 Nico Engraving Tatone Products Flyline Models Dakon Hob bies Bernies Craft & Hobby Monogram Models JJ Levine & Associates California Hobby Distributors Wooden Specialty Co Pan American Distributors Crown Coca Cola Bottling Co Felix V Bass & Co Inc Polks Hobbies RC Soaring/Pruss Continued page 41 joiner housings metric wire plus linkage myriad catalog will justice catalog also lists imported kits Scale sport F3B slope fliers catalog costs $3 three bucks well spent Send Sailplane Factory Box 341 Red Lion PA 17356 phone 717 244-4508 Ask 1982 catalog item really caught eye set fittings high-start fitting comprised tapered piece resembles small plumb bob little over inch long high-start rubber stretched over larger end secured place short lock ring about 3/16 long hole exposed endof plumb bob ac commodates attach ring staking towline have ever wrapped fitting come loose knot rubber give out gadget answer model builders once awhile runs non-related Soaring item just has passed Ive run three books first two Frank Ebling compilation kit plans darn near everything has come out model box over past several years includes Sailplanes Pattern ships Free Flight Indoor Outdoor Rubber Control Line etc books great browsing through picking up con struction ideas just reminiscing piece-de- resistance isa book called Build98 Model Aviation HARDWARE