ENGINE PREPARATION subject teresting article have just read appeared SEMPRA newsletter Im sure its author Dennis OBrian wont mind passing wrote primarily Sport Pylon enthus iasts basic principles hold true Py ion classes What makes winner Racing aircraft design Propeller technology Engine Flying skills What answer simple Its ingredientsplus pinch luck large pinch chatter throughout pits race fast persons going usually followed cheated up engines Well being time another have accused such underhanded tactics am tell long-awaited article will reveal almost secrets sit down get comfortable read picking engine look several ex amples brand have decided pur chase its possible cant purchasing via mail order Feel drag ging roughness rotating crankshaft piston off compression tells case machining crankshaft clearances ad equate Further roughness gritty spots de tected may tell presence metal par ticles assembly other foreign matter may engine factory others have already turned engine over may already have damaged critical sealing areas between piston liner Open exhaust port look vertical scratches sleeve slowly move piston upward look vertical scratches gouges its sur face especially toward top piston detect best bet move other engine choice pastes above checks look closely top edge piston Ideally want see small shiny area about 1A6 /32 wide around top edge piston piston skirt meets piston top ring should remain consistent possible varying width goes around much piston can see through exhaust port consistency tells mating surfaces piston sleeve rela tively round true An uneven ring may due out-of-round piston and/or sleeve such being conducive good seal hence leading loss power Now remove glow plug en gine turn engine slowly top dead cen ter feel very distinct grab piston approaches top dead center requires some effort continue moving piston through area top dead centerand other prerequi sites have passed check go ahead buy engine Note some engines grab slightly others Now have jewel home real fun begins Find yourself nice bowl cere al bowl works great fill half full lac quer thinner acetone Lay out paper towel disassemble engine Start backplate cylinder head carburetor etc until bolt-on components have removed Remove cylinder liner inserting hard wood dowel through top sleeve gle end exhaust port Bolt old prop onto crankshaft rotate shaft very slowly will result piston forcing sleeve out engine case sleeve will come out may have heat crankcase around perimeter sleeve torch means nor try pry sleeve out using screwdriver other metal object Further need secure crankcase working engine squeeze case vise may use vise simply secure engine-mounting lugs vise jaws Remember distort sleeve case other engine parts may well throw parts away start over may know have damaged component cannot emphasize enough importance gen tle handling prying using vise oper ate engine Once sleeve out remove piston-androd assembly carefidly sliding lower end rod off crankshafts crankpin al low components drop through top crankcase Important Mark rear con necting rod piston-and-rod assembly restored its correct orientation engine reassembled Slide crankshaft out rear crankcase remove rear crankshaft bearing should wrap rag folded-over pa per towel around cylinder portion crank case may held firmly case being heated torch area bear ing case reasonably hot rap rear case sharply piece wood until rear bearing falls out Now heat case area front crankshaft bearing Insert dowel through crankshaft hole place end against rear front bearing Rap end dowel hammer until bearing comes out front case Now disassembled place bear ings bolts crankshaft propeller drive washer cone bowl lacquer thinner Using acid brush other suitable tool clean parts thoroughly rinse com pletely thinner ideal case air hose should used blow liquid out bearings after cleaning available use stream water turning bearings rinsing water used check make sure bearings spin freely submerge thinner again before placing pa per towel dry Remove other parts thinner after Continued page 146 September 1988 57 Radio Control Pylon Racing Bill Hager 4HollySpiingsDr Conme TX 77302 Jim Greer R holds Denight Special Gary Ponnell hooking up fuel line Ed Rankin R Dave Layman calling Ed has flying Formula since 1967 still winning Recommended charge current Article index Ni-Cd cell weights DC-DC Super Charger mod parts list Connector wire resis tance Leisure 05 perform ance Caliph power systems Astm 15 props/power Geared Astro 05 15 props/power Popular equipment 85 Electric Fly 19 Weight Importance Plane/power system Radio servo receiver battery Covering Framework examples 20 Wfring Size/kind/loss/weight Soldering Connectors Auto model chargers Organizer Twins 6/85 9/85 4/87 9/87 12/87 2/88 2/88 7/88 8/88 3/86 1/84 4/84 8/87 1/84 1/84 4/84 10/84 11/84 2/84 10/87 12/87 2/84 2/84 3/85 7/85 2/86 6/87 So ends another columnalbeit somewhat unus ual hope find useful doing couldnt help think useful master index Electric articles magazines last 15 years would Would ever killer project Next month back normal column format Please forward comment question SASE please photo ad dress given very top column Thanks five years fun everyone RC Helicopters/Jolly Continued page 56 side frames tail tube gyro mount engine mount bearing mounts made fa miliar friend aluminum However landing gear tail rotor housing washout assembly blade grips blade mounts tail rotor mounts bellcranks yoke main reduction gear tail rotor blades molded fiber-filled plastic rest X-Cell made accepted materials Included smoked Lexan canopy all-metal inline swashplate metal clutch steel starting shaft both main tail rotor shafts centerless ground hardened steel As layout X-Cell conventional two side frames trapping engine mounts bearing mounts tail tube engine mounted vertically glow plug pointing aft starting shaft positioned forward main rotor shaft main reduction gear nylon has tail-rotor-drive takeoff track molded side covered least mistake 60-size X-Cell has ball bearings something rotates would expect control system virtually slop-free featur ing four-point attachment swashplate Col lective pitch activated via mixer roll servo output arm Using method 200 col lective pitch travel possible fore-and-aft cyclic pitch elevator servo mounted unique position just aft main rotor shaft its pushrod both straight short As matter fact pushrods straight runs course adds precise response al ready tight controls As far physical statistics go X-Cell 60 has overall length 53 height 16 main rotor diameter 57 engine-torotor reduction gear ratio 91 feature unique X-Cell use delta hinge tail rotor Theoretically reduces effect side gusts machine cant tell difference tell truth feature interesting Making use stock flybar weights adjust able head dampening wide collective range produces very adaptable machine can made respond needs wide range fliers novices all-out aerobatic perform ers looking X-Cell should get accessories designed adaptable other machines First would Rotor-Sport blades have proven give great performance well made ex hibit good characteristics during aerobatics cluding autorotations have commend Miniature Aircraft its use sticky-back vinyl blade covering excellent choice nd will lift off use Also available Magna pipes ex haust system allows smooth power keeps mass Helicopters longitudinal centerof-gravity As mentioned earlier instruction manual excellent Following letter will yield very easily built smooth-flying aerobatic per former After flying X-Cell have say few machines will match its flight performance probably best-rolling Helicop ter available today Just before mailed off months colusim magazines editorial office Ted Schoonard kindly sent photos some accessories X-Cell noteworthy Quick Silver version basically three-piece lightweight fiberglass molding turns stock X-Cell full-bodied FM-style machine addition 10 oz all-up weight mechanics have modified ac cept fuselage Merely remove canopy tail rotor housing install two fuselage halves over mechanics Theres real good thinking total adjustments can made removing mechanics shell will report other updates later column am now getting close running out space summary would like state X-Cell combination quality parts sound cur rent Helicopter design thinking brought together great kit yielding Helicopter great performance Because Schoonards strong interest improving products expect will see still excellent products coming years now personal note Wait Schoonard has very ill during first part 1988 behalf fraternity RC Helicopter enthusi asts congratulate Walt X-Cell wish speedy recovery can get back Helicopters love much BCNU RC Pylon Racing/Hager Continued page 57 brush cleaning place paper towel Spray fine mist WD4O other com parable lubricant parts Inspect interior crankcase flash sharp edges around ports machined areas spect carefully presence foreign materi al Using #11 X-Acto blade gently clean rough and/or sharp edges Inspect area sleeve goes case high spots rough edges detected wrap piece #400or #600-grit wet/dry sandpaper around fin ger dowel spray some WD4O sandpa per gently rotate sandpaper bore area Inspect rear crankcase cover appears crankshaft hitting cover some places polish rear covers face portion faces crankshaft things assem 146 Model Aviation I I II U UHuA Send $1 tO toupon lsrwithysurssme andsddresallsADDRESS MlcroMark 340-569Snyder Ave flvkeIeYHIhta NJ O722CITYSTATEZIP3 -7 top 9 t3t t98 UJzttru tats oattng tampionzjip CaUJornia contest attracts soar,nqs Jinest atuL rewards winners cask Lovesongs hindsongs Canianos dominated winners circLe capturing 7 oJ top spots Jrotn top JoCows Dave 1an&s Lovesong Steve CLasen klindsong Bob Dodqson song Shown Lenci song Brad CLasen Super Cansano Steve CaUup Windsong Jim Kirstine dsong shown photo ir Send 2 stamps free cata[og SON DESIGNS 21230 Damson Road Bothell WA 98021 206 776 -8067 Mon 9 am 5 pm bled piece 400/600 wet-or-dry sandpa per Make sure rest paper rigid per fectly flat surface sueh piece glassbetter yet piece marble Spray sandpaper WD4O before polishing crankcase cover Move cover over sandpaper figure eight motion until rub marks re moved Another way cure problem add extra gasket rear cover reassembling engine provided engine uses gas ket joint wont work Rossi example since engine uses 0-ring seal area Carefully clean rinse parts thinner spray WD4O Begin reassembly placing bearings freczer no joke about half-hour Heat front crankcase front bear ing area Take cold bearing freczer place front crankshaft use crankshaft tool insert bearing case front scheme allows snout shaft align bearing hole Gently tap rear crankshaft press bearing case Remove crankshaft bearing place bard round object having diameter less bearing agalnst front bearing Tap object until bearing fully seated case properly sized socket socket-wrench set ideal tool task Use similar procedure reinstalling rear crankshaft bearing Use dowel against rear crankshaft tapping seat bearing Remove crankshaft once agalo use socket other suitable object press agalnst rear bearing make cer tain completely seated Now slide crankshaft engine spin crank case should spin freely rock back forth after being released slowing down no drag crankshaft does spin freely bolt prop onto shaft heat crankcase areas front rear bearings tap gently crankshaft fore aft crankshaft still completely free remove once again check bearings foreign material Pay particular attention area bore case between front rear crankshaft bearings crankshaft rub bing area should polish case piece 400/600 wet-or-dry sandpaper wrapped around dowel approximately diameter bore Remember spray WD4O before rotating bore area case Take small step time because shaft must seal area engine run ning Make trial fits frequent intervals Fully clean out case bearings thinner before reinserting crankshaft can out removing bearings unless foreign mate rial gets bearings cant rinsed out drag still after youve tried procedures check crankshaft runout bearings proper seating Once youre satisfied crankshaft area reinstall piston-and-rod assembly back case rear rodwhich marked disassembled itfacing rear engine careful scar sides piston Reset connecting rod crankpin set piston bottom dead center Very carefully slide sleeve top case about halfway Slowly rotate crankshaft bring pis ton up bottom sleeve Put finger down through sleeve use steer top piston sleeve push sleeve fully case Twist sleeve around care fully exhaust intake ports line up openings crankcase Look through exhaust port line up transfer boost ports look down through sleeve top help line up exhaust port Next reinstall cylinder head placing attaching bolts until hand tight begin gradually tightening bolt se quence using crossing pattern ie front bolt rear bolt left front right rear etc until tight Now oil bearings crankshaft piston/sleeve parts Marvel Mystery Oil similar lubricant pouring intake exhaust areas well open back engine Hand crank engine old prop place making sure feels loose off com pression pops back forth easily flipped through compression seems OK install backplate Once again use crossing pattern tightening up bolts Finally install carburetor prop drive washer havent already done test run break engine fol lowing steps should taken Bolt exhaust header engine Make sure headers opening same size exhaust port engine its use Dremel tool files header bring about match two openings Place engine test stand fill tank same type fuel used racing 12 V2% 15% nitro Hook up rod carburetor throttle arm install proper tuned pipe its pressure fitting connected fuel tank Install un loaded prop 8 x 6 paddle prop works fine BATT- CHEKk Saves Time . Saves Models Install RC Models 3-Level indication receiver battery status press button Precise Rugged Small Light 1/2 oz Made SA Also custom units other applications Order Today $1495 dealer send check money order postpaid Protune Corp 914 462-6452 PO Box 1808 Poughkeopsle NY 12601 INY State residents add sales taxi September 1988 147 High Performance Models presentsthe ECL IPSE Designed Henry Piorun Former Canadian National Champion FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pre-Cut Holes Wing Joiner Tubes Ultralight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fibergiass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9556116 St North Delta British Columbia 6Z4 Canada 604-588-0605 Basic Kit $12500 Pre-Buift Kit- $32500 laddslsoosftHl Send Check Money Order ATIONS Wingspan50 Wing Area500 sq Length34 Weight3/2 4 lbs TERMSU Engine25 40 Check Money Order COD Cash Add $400 Shipping Add $300 COD Arizona Reaidents add 6% Sales Tax BACK BY POPULAR DEMAND FUMTOFLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE KIT FEATURES Built Up Wing & Fuselage Select Balsa Spruce & Light Plywood Parts Machined & Fitted Photo Illustrated Construction Book Complete Hardware Package DEALER Tn-Gear Tail Dragger INVITED i vi 1 Wna wu m 1 15 1 i m aa u —.a uinaa. m I flCA 1 ThAUC5 U 9 South Plaza Way #335Flagstaff Arizona 86001 fire up engine leave running rich long period time Bring up rich two-cycle allow run wide open its running needle out solid two-cycle continuously until fuel runs out Occasionally pinch fuel line en gine solid two-cycle make peak Quickly release fuel line needle en gine back slightly rich condition Repeat steps running out two three 10-to12-ox tanks fuel using ear protec tion doing arent Ed Now install prop caliber intend race Start engine slowly bring peak Check pinching fuel line seeing rpm increases releasing fuel line rpm doesnt rise pinch line running too lean Back offi engine reaches its peak speed read rpm tach record value Stop engine remove pipe start cutting length header quarter-inch increments After cut reinstall pipe reneedle engine its peak Read record rpm Con tinue doing until rpm no longer increases approximate length want run pipe alrcraft Actually may have go slightly shorter since engine unloads air pipe would tune pipe slightly shorter length what established test stand suggest first try air proper length estab lished test stand Lastly super engine will no good prop pipe pipe length etc working together Again combination things contribute top operation Most importantly must able fly aircraft consistently around pylonswhich requires practice fastest model world will always finish last cant bend around poles have written article hopes rank beginners will understand ben efit Obviously methods improving engines performance cheating other cheeks changes etc re quire dollars spare parts special tools some expensive purpose Sport Pylon use basically box-stock en gines would rather stay away types mods As mentioned first lines article right combination ingredi ents will competitive circuit Thanks Dennis OBrian good thoughts feel necessary modif engine need Formula Good luck PS have ideas helpful hints would benefit fellow flier send can pass along Please note new address given very top column Corn puters/Evans Continued page 60 last theyre running down quicker can keep track lasf re charged cycled battery packs keeping track recycling times youll know its time replace batter ies Youll know its time disassem ble engines whether different types fuel give less fouling computer better house full servants Its cheaper too Let look after tedious tasks model building several free programs show calculate plot alrfoils varying chords Ask computer friends check lo cal bulletin boards programs programs thatll print out wing rib patterns according specifica tions Ive seen inexpensive computers such Commodore-64 spend days hunched over drafting board can building flying Finally more simple computer programs showing up maga zines like such things calcu late appropriate center gravity match propeller specifications power drag factors figure out efficient fuel mixture may have type programs computer once youve done can share other members club between clubs member typed pro gram youd have club library Youll find time spend paid back times over time save avoiding hand cal culations dream scratch builders Scale en thusiasts able draft plan quickly easily change di mensions whenever want isnt pipe dream exists Computer Assisted Design CAD programs theyre readily available IBM- Macintosh-type computer Once youve en tered blueprint can modify change its scale size seconds youre happy results can restore original wink CAD systems neednt expensive Some low cost ones sell around $75 club could easily create librar ies plans exchange Im just walting see plans service will first supply blueprints three-view diagrams programs No RC club should computer first use jumps mind keep ing membership lists way nobody forgotten membership renewals can tracked dues can collected fairly Amazingly members wholl swear paid human collector last month promise pay next week will cough up confronted computerized state ment guess weve programmed creditors computers No club member wants spend hours bal ancing books could out flying Likewise no auditing committee wants burn out its collective eyes trying decipher hieroglyphics gen eral ledger Theyd rather use eyes track planes lot inex pensive free accounting programs lying around computerized accounting pack age will reduce treasurers bookkeep ing time 10 15 minutes month Better yet audit committee can check over printed reports during coffee break person turning out newsletter will job almost willingly have computer system Youll surprised much quality newsletter will improve youll able get items print hours instead daysso members will learn about last-minute changes Pattern con test week before event rather month after Systems run newsletter vary may have simple word processing pro gram lets print correctly punctu ated grammatically correct articles simpleand inexpensivedot matrix print er other end scale may have desktop publishing system lets 148 Model Aviation
Edition: Model Aviation - 1988/09
Page Numbers: 57, 146, 147, 148
ENGINE PREPARATION subject teresting article have just read appeared SEMPRA newsletter Im sure its author Dennis OBrian wont mind passing wrote primarily Sport Pylon enthus iasts basic principles hold true Py ion classes What makes winner Racing aircraft design Propeller technology Engine Flying skills What answer simple Its ingredientsplus pinch luck large pinch chatter throughout pits race fast persons going usually followed cheated up engines Well being time another have accused such underhanded tactics am tell long-awaited article will reveal almost secrets sit down get comfortable read picking engine look several ex amples brand have decided pur chase its possible cant purchasing via mail order Feel drag ging roughness rotating crankshaft piston off compression tells case machining crankshaft clearances ad equate Further roughness gritty spots de tected may tell presence metal par ticles assembly other foreign matter may engine factory others have already turned engine over may already have damaged critical sealing areas between piston liner Open exhaust port look vertical scratches sleeve slowly move piston upward look vertical scratches gouges its sur face especially toward top piston detect best bet move other engine choice pastes above checks look closely top edge piston Ideally want see small shiny area about 1A6 /32 wide around top edge piston piston skirt meets piston top ring should remain consistent possible varying width goes around much piston can see through exhaust port consistency tells mating surfaces piston sleeve rela tively round true An uneven ring may due out-of-round piston and/or sleeve such being conducive good seal hence leading loss power Now remove glow plug en gine turn engine slowly top dead cen ter feel very distinct grab piston approaches top dead center requires some effort continue moving piston through area top dead centerand other prerequi sites have passed check go ahead buy engine Note some engines grab slightly others Now have jewel home real fun begins Find yourself nice bowl cere al bowl works great fill half full lac quer thinner acetone Lay out paper towel disassemble engine Start backplate cylinder head carburetor etc until bolt-on components have removed Remove cylinder liner inserting hard wood dowel through top sleeve gle end exhaust port Bolt old prop onto crankshaft rotate shaft very slowly will result piston forcing sleeve out engine case sleeve will come out may have heat crankcase around perimeter sleeve torch means nor try pry sleeve out using screwdriver other metal object Further need secure crankcase working engine squeeze case vise may use vise simply secure engine-mounting lugs vise jaws Remember distort sleeve case other engine parts may well throw parts away start over may know have damaged component cannot emphasize enough importance gen tle handling prying using vise oper ate engine Once sleeve out remove piston-androd assembly carefidly sliding lower end rod off crankshafts crankpin al low components drop through top crankcase Important Mark rear con necting rod piston-and-rod assembly restored its correct orientation engine reassembled Slide crankshaft out rear crankcase remove rear crankshaft bearing should wrap rag folded-over pa per towel around cylinder portion crank case may held firmly case being heated torch area bear ing case reasonably hot rap rear case sharply piece wood until rear bearing falls out Now heat case area front crankshaft bearing Insert dowel through crankshaft hole place end against rear front bearing Rap end dowel hammer until bearing comes out front case Now disassembled place bear ings bolts crankshaft propeller drive washer cone bowl lacquer thinner Using acid brush other suitable tool clean parts thoroughly rinse com pletely thinner ideal case air hose should used blow liquid out bearings after cleaning available use stream water turning bearings rinsing water used check make sure bearings spin freely submerge thinner again before placing pa per towel dry Remove other parts thinner after Continued page 146 September 1988 57 Radio Control Pylon Racing Bill Hager 4HollySpiingsDr Conme TX 77302 Jim Greer R holds Denight Special Gary Ponnell hooking up fuel line Ed Rankin R Dave Layman calling Ed has flying Formula since 1967 still winning Recommended charge current Article index Ni-Cd cell weights DC-DC Super Charger mod parts list Connector wire resis tance Leisure 05 perform ance Caliph power systems Astm 15 props/power Geared Astro 05 15 props/power Popular equipment 85 Electric Fly 19 Weight Importance Plane/power system Radio servo receiver battery Covering Framework examples 20 Wfring Size/kind/loss/weight Soldering Connectors Auto model chargers Organizer Twins 6/85 9/85 4/87 9/87 12/87 2/88 2/88 7/88 8/88 3/86 1/84 4/84 8/87 1/84 1/84 4/84 10/84 11/84 2/84 10/87 12/87 2/84 2/84 3/85 7/85 2/86 6/87 So ends another columnalbeit somewhat unus ual hope find useful doing couldnt help think useful master index Electric articles magazines last 15 years would Would ever killer project Next month back normal column format Please forward comment question SASE please photo ad dress given very top column Thanks five years fun everyone RC Helicopters/Jolly Continued page 56 side frames tail tube gyro mount engine mount bearing mounts made fa miliar friend aluminum However landing gear tail rotor housing washout assembly blade grips blade mounts tail rotor mounts bellcranks yoke main reduction gear tail rotor blades molded fiber-filled plastic rest X-Cell made accepted materials Included smoked Lexan canopy all-metal inline swashplate metal clutch steel starting shaft both main tail rotor shafts centerless ground hardened steel As layout X-Cell conventional two side frames trapping engine mounts bearing mounts tail tube engine mounted vertically glow plug pointing aft starting shaft positioned forward main rotor shaft main reduction gear nylon has tail-rotor-drive takeoff track molded side covered least mistake 60-size X-Cell has ball bearings something rotates would expect control system virtually slop-free featur ing four-point attachment swashplate Col lective pitch activated via mixer roll servo output arm Using method 200 col lective pitch travel possible fore-and-aft cyclic pitch elevator servo mounted unique position just aft main rotor shaft its pushrod both straight short As matter fact pushrods straight runs course adds precise response al ready tight controls As far physical statistics go X-Cell 60 has overall length 53 height 16 main rotor diameter 57 engine-torotor reduction gear ratio 91 feature unique X-Cell use delta hinge tail rotor Theoretically reduces effect side gusts machine cant tell difference tell truth feature interesting Making use stock flybar weights adjust able head dampening wide collective range produces very adaptable machine can made respond needs wide range fliers novices all-out aerobatic perform ers looking X-Cell should get accessories designed adaptable other machines First would Rotor-Sport blades have proven give great performance well made ex hibit good characteristics during aerobatics cluding autorotations have commend Miniature Aircraft its use sticky-back vinyl blade covering excellent choice nd will lift off use Also available Magna pipes ex haust system allows smooth power keeps mass Helicopters longitudinal centerof-gravity As mentioned earlier instruction manual excellent Following letter will yield very easily built smooth-flying aerobatic per former After flying X-Cell have say few machines will match its flight performance probably best-rolling Helicop ter available today Just before mailed off months colusim magazines editorial office Ted Schoonard kindly sent photos some accessories X-Cell noteworthy Quick Silver version basically three-piece lightweight fiberglass molding turns stock X-Cell full-bodied FM-style machine addition 10 oz all-up weight mechanics have modified ac cept fuselage Merely remove canopy tail rotor housing install two fuselage halves over mechanics Theres real good thinking total adjustments can made removing mechanics shell will report other updates later column am now getting close running out space summary would like state X-Cell combination quality parts sound cur rent Helicopter design thinking brought together great kit yielding Helicopter great performance Because Schoonards strong interest improving products expect will see still excellent products coming years now personal note Wait Schoonard has very ill during first part 1988 behalf fraternity RC Helicopter enthusi asts congratulate Walt X-Cell wish speedy recovery can get back Helicopters love much BCNU RC Pylon Racing/Hager Continued page 57 brush cleaning place paper towel Spray fine mist WD4O other com parable lubricant parts Inspect interior crankcase flash sharp edges around ports machined areas spect carefully presence foreign materi al Using #11 X-Acto blade gently clean rough and/or sharp edges Inspect area sleeve goes case high spots rough edges detected wrap piece #400or #600-grit wet/dry sandpaper around fin ger dowel spray some WD4O sandpa per gently rotate sandpaper bore area Inspect rear crankcase cover appears crankshaft hitting cover some places polish rear covers face portion faces crankshaft things assem 146 Model Aviation I I II U UHuA Send $1 tO toupon lsrwithysurssme andsddresallsADDRESS MlcroMark 340-569Snyder Ave flvkeIeYHIhta NJ O722CITYSTATEZIP3 -7 top 9 t3t t98 UJzttru tats oattng tampionzjip CaUJornia contest attracts soar,nqs Jinest atuL rewards winners cask Lovesongs hindsongs Canianos dominated winners circLe capturing 7 oJ top spots Jrotn top JoCows Dave 1an&s Lovesong Steve CLasen klindsong Bob Dodqson song Shown Lenci song Brad CLasen Super Cansano Steve CaUup Windsong Jim Kirstine dsong shown photo ir Send 2 stamps free cata[og SON DESIGNS 21230 Damson Road Bothell WA 98021 206 776 -8067 Mon 9 am 5 pm bled piece 400/600 wet-or-dry sandpa per Make sure rest paper rigid per fectly flat surface sueh piece glassbetter yet piece marble Spray sandpaper WD4O before polishing crankcase cover Move cover over sandpaper figure eight motion until rub marks re moved Another way cure problem add extra gasket rear cover reassembling engine provided engine uses gas ket joint wont work Rossi example since engine uses 0-ring seal area Carefully clean rinse parts thinner spray WD4O Begin reassembly placing bearings freczer no joke about half-hour Heat front crankcase front bear ing area Take cold bearing freczer place front crankshaft use crankshaft tool insert bearing case front scheme allows snout shaft align bearing hole Gently tap rear crankshaft press bearing case Remove crankshaft bearing place bard round object having diameter less bearing agalnst front bearing Tap object until bearing fully seated case properly sized socket socket-wrench set ideal tool task Use similar procedure reinstalling rear crankshaft bearing Use dowel against rear crankshaft tapping seat bearing Remove crankshaft once agalo use socket other suitable object press agalnst rear bearing make cer tain completely seated Now slide crankshaft engine spin crank case should spin freely rock back forth after being released slowing down no drag crankshaft does spin freely bolt prop onto shaft heat crankcase areas front rear bearings tap gently crankshaft fore aft crankshaft still completely free remove once again check bearings foreign material Pay particular attention area bore case between front rear crankshaft bearings crankshaft rub bing area should polish case piece 400/600 wet-or-dry sandpaper wrapped around dowel approximately diameter bore Remember spray WD4O before rotating bore area case Take small step time because shaft must seal area engine run ning Make trial fits frequent intervals Fully clean out case bearings thinner before reinserting crankshaft can out removing bearings unless foreign mate rial gets bearings cant rinsed out drag still after youve tried procedures check crankshaft runout bearings proper seating Once youre satisfied crankshaft area reinstall piston-and-rod assembly back case rear rodwhich marked disassembled itfacing rear engine careful scar sides piston Reset connecting rod crankpin set piston bottom dead center Very carefully slide sleeve top case about halfway Slowly rotate crankshaft bring pis ton up bottom sleeve Put finger down through sleeve use steer top piston sleeve push sleeve fully case Twist sleeve around care fully exhaust intake ports line up openings crankcase Look through exhaust port line up transfer boost ports look down through sleeve top help line up exhaust port Next reinstall cylinder head placing attaching bolts until hand tight begin gradually tightening bolt se quence using crossing pattern ie front bolt rear bolt left front right rear etc until tight Now oil bearings crankshaft piston/sleeve parts Marvel Mystery Oil similar lubricant pouring intake exhaust areas well open back engine Hand crank engine old prop place making sure feels loose off com pression pops back forth easily flipped through compression seems OK install backplate Once again use crossing pattern tightening up bolts Finally install carburetor prop drive washer havent already done test run break engine fol lowing steps should taken Bolt exhaust header engine Make sure headers opening same size exhaust port engine its use Dremel tool files header bring about match two openings Place engine test stand fill tank same type fuel used racing 12 V2% 15% nitro Hook up rod carburetor throttle arm install proper tuned pipe its pressure fitting connected fuel tank Install un loaded prop 8 x 6 paddle prop works fine BATT- CHEKk Saves Time . Saves Models Install RC Models 3-Level indication receiver battery status press button Precise Rugged Small Light 1/2 oz Made SA Also custom units other applications Order Today $1495 dealer send check money order postpaid Protune Corp 914 462-6452 PO Box 1808 Poughkeopsle NY 12601 INY State residents add sales taxi September 1988 147 High Performance Models presentsthe ECL IPSE Designed Henry Piorun Former Canadian National Champion FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pre-Cut Holes Wing Joiner Tubes Ultralight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fibergiass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9556116 St North Delta British Columbia 6Z4 Canada 604-588-0605 Basic Kit $12500 Pre-Buift Kit- $32500 laddslsoosftHl Send Check Money Order ATIONS Wingspan50 Wing Area500 sq Length34 Weight3/2 4 lbs TERMSU Engine25 40 Check Money Order COD Cash Add $400 Shipping Add $300 COD Arizona Reaidents add 6% Sales Tax BACK BY POPULAR DEMAND FUMTOFLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE KIT FEATURES Built Up Wing & Fuselage Select Balsa Spruce & Light Plywood Parts Machined & Fitted Photo Illustrated Construction Book Complete Hardware Package DEALER Tn-Gear Tail Dragger INVITED i vi 1 Wna wu m 1 15 1 i m aa u —.a uinaa. m I flCA 1 ThAUC5 U 9 South Plaza Way #335Flagstaff Arizona 86001 fire up engine leave running rich long period time Bring up rich two-cycle allow run wide open its running needle out solid two-cycle continuously until fuel runs out Occasionally pinch fuel line en gine solid two-cycle make peak Quickly release fuel line needle en gine back slightly rich condition Repeat steps running out two three 10-to12-ox tanks fuel using ear protec tion doing arent Ed Now install prop caliber intend race Start engine slowly bring peak Check pinching fuel line seeing rpm increases releasing fuel line rpm doesnt rise pinch line running too lean Back offi engine reaches its peak speed read rpm tach record value Stop engine remove pipe start cutting length header quarter-inch increments After cut reinstall pipe reneedle engine its peak Read record rpm Con tinue doing until rpm no longer increases approximate length want run pipe alrcraft Actually may have go slightly shorter since engine unloads air pipe would tune pipe slightly shorter length what established test stand suggest first try air proper length estab lished test stand Lastly super engine will no good prop pipe pipe length etc working together Again combination things contribute top operation Most importantly must able fly aircraft consistently around pylonswhich requires practice fastest model world will always finish last cant bend around poles have written article hopes rank beginners will understand ben efit Obviously methods improving engines performance cheating other cheeks changes etc re quire dollars spare parts special tools some expensive purpose Sport Pylon use basically box-stock en gines would rather stay away types mods As mentioned first lines article right combination ingredi ents will competitive circuit Thanks Dennis OBrian good thoughts feel necessary modif engine need Formula Good luck PS have ideas helpful hints would benefit fellow flier send can pass along Please note new address given very top column Corn puters/Evans Continued page 60 last theyre running down quicker can keep track lasf re charged cycled battery packs keeping track recycling times youll know its time replace batter ies Youll know its time disassem ble engines whether different types fuel give less fouling computer better house full servants Its cheaper too Let look after tedious tasks model building several free programs show calculate plot alrfoils varying chords Ask computer friends check lo cal bulletin boards programs programs thatll print out wing rib patterns according specifica tions Ive seen inexpensive computers such Commodore-64 spend days hunched over drafting board can building flying Finally more simple computer programs showing up maga zines like such things calcu late appropriate center gravity match propeller specifications power drag factors figure out efficient fuel mixture may have type programs computer once youve done can share other members club between clubs member typed pro gram youd have club library Youll find time spend paid back times over time save avoiding hand cal culations dream scratch builders Scale en thusiasts able draft plan quickly easily change di mensions whenever want isnt pipe dream exists Computer Assisted Design CAD programs theyre readily available IBM- Macintosh-type computer Once youve en tered blueprint can modify change its scale size seconds youre happy results can restore original wink CAD systems neednt expensive Some low cost ones sell around $75 club could easily create librar ies plans exchange Im just walting see plans service will first supply blueprints three-view diagrams programs No RC club should computer first use jumps mind keep ing membership lists way nobody forgotten membership renewals can tracked dues can collected fairly Amazingly members wholl swear paid human collector last month promise pay next week will cough up confronted computerized state ment guess weve programmed creditors computers No club member wants spend hours bal ancing books could out flying Likewise no auditing committee wants burn out its collective eyes trying decipher hieroglyphics gen eral ledger Theyd rather use eyes track planes lot inex pensive free accounting programs lying around computerized accounting pack age will reduce treasurers bookkeep ing time 10 15 minutes month Better yet audit committee can check over printed reports during coffee break person turning out newsletter will job almost willingly have computer system Youll surprised much quality newsletter will improve youll able get items print hours instead daysso members will learn about last-minute changes Pattern con test week before event rather month after Systems run newsletter vary may have simple word processing pro gram lets print correctly punctu ated grammatically correct articles simpleand inexpensivedot matrix print er other end scale may have desktop publishing system lets 148 Model Aviation
Edition: Model Aviation - 1988/09
Page Numbers: 57, 146, 147, 148
ENGINE PREPARATION subject teresting article have just read appeared SEMPRA newsletter Im sure its author Dennis OBrian wont mind passing wrote primarily Sport Pylon enthus iasts basic principles hold true Py ion classes What makes winner Racing aircraft design Propeller technology Engine Flying skills What answer simple Its ingredientsplus pinch luck large pinch chatter throughout pits race fast persons going usually followed cheated up engines Well being time another have accused such underhanded tactics am tell long-awaited article will reveal almost secrets sit down get comfortable read picking engine look several ex amples brand have decided pur chase its possible cant purchasing via mail order Feel drag ging roughness rotating crankshaft piston off compression tells case machining crankshaft clearances ad equate Further roughness gritty spots de tected may tell presence metal par ticles assembly other foreign matter may engine factory others have already turned engine over may already have damaged critical sealing areas between piston liner Open exhaust port look vertical scratches sleeve slowly move piston upward look vertical scratches gouges its sur face especially toward top piston detect best bet move other engine choice pastes above checks look closely top edge piston Ideally want see small shiny area about 1A6 /32 wide around top edge piston piston skirt meets piston top ring should remain consistent possible varying width goes around much piston can see through exhaust port consistency tells mating surfaces piston sleeve rela tively round true An uneven ring may due out-of-round piston and/or sleeve such being conducive good seal hence leading loss power Now remove glow plug en gine turn engine slowly top dead cen ter feel very distinct grab piston approaches top dead center requires some effort continue moving piston through area top dead centerand other prerequi sites have passed check go ahead buy engine Note some engines grab slightly others Now have jewel home real fun begins Find yourself nice bowl cere al bowl works great fill half full lac quer thinner acetone Lay out paper towel disassemble engine Start backplate cylinder head carburetor etc until bolt-on components have removed Remove cylinder liner inserting hard wood dowel through top sleeve gle end exhaust port Bolt old prop onto crankshaft rotate shaft very slowly will result piston forcing sleeve out engine case sleeve will come out may have heat crankcase around perimeter sleeve torch means nor try pry sleeve out using screwdriver other metal object Further need secure crankcase working engine squeeze case vise may use vise simply secure engine-mounting lugs vise jaws Remember distort sleeve case other engine parts may well throw parts away start over may know have damaged component cannot emphasize enough importance gen tle handling prying using vise oper ate engine Once sleeve out remove piston-androd assembly carefidly sliding lower end rod off crankshafts crankpin al low components drop through top crankcase Important Mark rear con necting rod piston-and-rod assembly restored its correct orientation engine reassembled Slide crankshaft out rear crankcase remove rear crankshaft bearing should wrap rag folded-over pa per towel around cylinder portion crank case may held firmly case being heated torch area bear ing case reasonably hot rap rear case sharply piece wood until rear bearing falls out Now heat case area front crankshaft bearing Insert dowel through crankshaft hole place end against rear front bearing Rap end dowel hammer until bearing comes out front case Now disassembled place bear ings bolts crankshaft propeller drive washer cone bowl lacquer thinner Using acid brush other suitable tool clean parts thoroughly rinse com pletely thinner ideal case air hose should used blow liquid out bearings after cleaning available use stream water turning bearings rinsing water used check make sure bearings spin freely submerge thinner again before placing pa per towel dry Remove other parts thinner after Continued page 146 September 1988 57 Radio Control Pylon Racing Bill Hager 4HollySpiingsDr Conme TX 77302 Jim Greer R holds Denight Special Gary Ponnell hooking up fuel line Ed Rankin R Dave Layman calling Ed has flying Formula since 1967 still winning Recommended charge current Article index Ni-Cd cell weights DC-DC Super Charger mod parts list Connector wire resis tance Leisure 05 perform ance Caliph power systems Astm 15 props/power Geared Astro 05 15 props/power Popular equipment 85 Electric Fly 19 Weight Importance Plane/power system Radio servo receiver battery Covering Framework examples 20 Wfring Size/kind/loss/weight Soldering Connectors Auto model chargers Organizer Twins 6/85 9/85 4/87 9/87 12/87 2/88 2/88 7/88 8/88 3/86 1/84 4/84 8/87 1/84 1/84 4/84 10/84 11/84 2/84 10/87 12/87 2/84 2/84 3/85 7/85 2/86 6/87 So ends another columnalbeit somewhat unus ual hope find useful doing couldnt help think useful master index Electric articles magazines last 15 years would Would ever killer project Next month back normal column format Please forward comment question SASE please photo ad dress given very top column Thanks five years fun everyone RC Helicopters/Jolly Continued page 56 side frames tail tube gyro mount engine mount bearing mounts made fa miliar friend aluminum However landing gear tail rotor housing washout assembly blade grips blade mounts tail rotor mounts bellcranks yoke main reduction gear tail rotor blades molded fiber-filled plastic rest X-Cell made accepted materials Included smoked Lexan canopy all-metal inline swashplate metal clutch steel starting shaft both main tail rotor shafts centerless ground hardened steel As layout X-Cell conventional two side frames trapping engine mounts bearing mounts tail tube engine mounted vertically glow plug pointing aft starting shaft positioned forward main rotor shaft main reduction gear nylon has tail-rotor-drive takeoff track molded side covered least mistake 60-size X-Cell has ball bearings something rotates would expect control system virtually slop-free featur ing four-point attachment swashplate Col lective pitch activated via mixer roll servo output arm Using method 200 col lective pitch travel possible fore-and-aft cyclic pitch elevator servo mounted unique position just aft main rotor shaft its pushrod both straight short As matter fact pushrods straight runs course adds precise response al ready tight controls As far physical statistics go X-Cell 60 has overall length 53 height 16 main rotor diameter 57 engine-torotor reduction gear ratio 91 feature unique X-Cell use delta hinge tail rotor Theoretically reduces effect side gusts machine cant tell difference tell truth feature interesting Making use stock flybar weights adjust able head dampening wide collective range produces very adaptable machine can made respond needs wide range fliers novices all-out aerobatic perform ers looking X-Cell should get accessories designed adaptable other machines First would Rotor-Sport blades have proven give great performance well made ex hibit good characteristics during aerobatics cluding autorotations have commend Miniature Aircraft its use sticky-back vinyl blade covering excellent choice nd will lift off use Also available Magna pipes ex haust system allows smooth power keeps mass Helicopters longitudinal centerof-gravity As mentioned earlier instruction manual excellent Following letter will yield very easily built smooth-flying aerobatic per former After flying X-Cell have say few machines will match its flight performance probably best-rolling Helicop ter available today Just before mailed off months colusim magazines editorial office Ted Schoonard kindly sent photos some accessories X-Cell noteworthy Quick Silver version basically three-piece lightweight fiberglass molding turns stock X-Cell full-bodied FM-style machine addition 10 oz all-up weight mechanics have modified ac cept fuselage Merely remove canopy tail rotor housing install two fuselage halves over mechanics Theres real good thinking total adjustments can made removing mechanics shell will report other updates later column am now getting close running out space summary would like state X-Cell combination quality parts sound cur rent Helicopter design thinking brought together great kit yielding Helicopter great performance Because Schoonards strong interest improving products expect will see still excellent products coming years now personal note Wait Schoonard has very ill during first part 1988 behalf fraternity RC Helicopter enthusi asts congratulate Walt X-Cell wish speedy recovery can get back Helicopters love much BCNU RC Pylon Racing/Hager Continued page 57 brush cleaning place paper towel Spray fine mist WD4O other com parable lubricant parts Inspect interior crankcase flash sharp edges around ports machined areas spect carefully presence foreign materi al Using #11 X-Acto blade gently clean rough and/or sharp edges Inspect area sleeve goes case high spots rough edges detected wrap piece #400or #600-grit wet/dry sandpaper around fin ger dowel spray some WD4O sandpa per gently rotate sandpaper bore area Inspect rear crankcase cover appears crankshaft hitting cover some places polish rear covers face portion faces crankshaft things assem 146 Model Aviation I I II U UHuA Send $1 tO toupon lsrwithysurssme andsddresallsADDRESS MlcroMark 340-569Snyder Ave flvkeIeYHIhta NJ O722CITYSTATEZIP3 -7 top 9 t3t t98 UJzttru tats oattng tampionzjip CaUJornia contest attracts soar,nqs Jinest atuL rewards winners cask Lovesongs hindsongs Canianos dominated winners circLe capturing 7 oJ top spots Jrotn top JoCows Dave 1an&s Lovesong Steve CLasen klindsong Bob Dodqson song Shown Lenci song Brad CLasen Super Cansano Steve CaUup Windsong Jim Kirstine dsong shown photo ir Send 2 stamps free cata[og SON DESIGNS 21230 Damson Road Bothell WA 98021 206 776 -8067 Mon 9 am 5 pm bled piece 400/600 wet-or-dry sandpa per Make sure rest paper rigid per fectly flat surface sueh piece glassbetter yet piece marble Spray sandpaper WD4O before polishing crankcase cover Move cover over sandpaper figure eight motion until rub marks re moved Another way cure problem add extra gasket rear cover reassembling engine provided engine uses gas ket joint wont work Rossi example since engine uses 0-ring seal area Carefully clean rinse parts thinner spray WD4O Begin reassembly placing bearings freczer no joke about half-hour Heat front crankcase front bear ing area Take cold bearing freczer place front crankshaft use crankshaft tool insert bearing case front scheme allows snout shaft align bearing hole Gently tap rear crankshaft press bearing case Remove crankshaft bearing place bard round object having diameter less bearing agalnst front bearing Tap object until bearing fully seated case properly sized socket socket-wrench set ideal tool task Use similar procedure reinstalling rear crankshaft bearing Use dowel against rear crankshaft tapping seat bearing Remove crankshaft once agalo use socket other suitable object press agalnst rear bearing make cer tain completely seated Now slide crankshaft engine spin crank case should spin freely rock back forth after being released slowing down no drag crankshaft does spin freely bolt prop onto shaft heat crankcase areas front rear bearings tap gently crankshaft fore aft crankshaft still completely free remove once again check bearings foreign material Pay particular attention area bore case between front rear crankshaft bearings crankshaft rub bing area should polish case piece 400/600 wet-or-dry sandpaper wrapped around dowel approximately diameter bore Remember spray WD4O before rotating bore area case Take small step time because shaft must seal area engine run ning Make trial fits frequent intervals Fully clean out case bearings thinner before reinserting crankshaft can out removing bearings unless foreign mate rial gets bearings cant rinsed out drag still after youve tried procedures check crankshaft runout bearings proper seating Once youre satisfied crankshaft area reinstall piston-and-rod assembly back case rear rodwhich marked disassembled itfacing rear engine careful scar sides piston Reset connecting rod crankpin set piston bottom dead center Very carefully slide sleeve top case about halfway Slowly rotate crankshaft bring pis ton up bottom sleeve Put finger down through sleeve use steer top piston sleeve push sleeve fully case Twist sleeve around care fully exhaust intake ports line up openings crankcase Look through exhaust port line up transfer boost ports look down through sleeve top help line up exhaust port Next reinstall cylinder head placing attaching bolts until hand tight begin gradually tightening bolt se quence using crossing pattern ie front bolt rear bolt left front right rear etc until tight Now oil bearings crankshaft piston/sleeve parts Marvel Mystery Oil similar lubricant pouring intake exhaust areas well open back engine Hand crank engine old prop place making sure feels loose off com pression pops back forth easily flipped through compression seems OK install backplate Once again use crossing pattern tightening up bolts Finally install carburetor prop drive washer havent already done test run break engine fol lowing steps should taken Bolt exhaust header engine Make sure headers opening same size exhaust port engine its use Dremel tool files header bring about match two openings Place engine test stand fill tank same type fuel used racing 12 V2% 15% nitro Hook up rod carburetor throttle arm install proper tuned pipe its pressure fitting connected fuel tank Install un loaded prop 8 x 6 paddle prop works fine BATT- CHEKk Saves Time . Saves Models Install RC Models 3-Level indication receiver battery status press button Precise Rugged Small Light 1/2 oz Made SA Also custom units other applications Order Today $1495 dealer send check money order postpaid Protune Corp 914 462-6452 PO Box 1808 Poughkeopsle NY 12601 INY State residents add sales taxi September 1988 147 High Performance Models presentsthe ECL IPSE Designed Henry Piorun Former Canadian National Champion FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pre-Cut Holes Wing Joiner Tubes Ultralight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fibergiass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9556116 St North Delta British Columbia 6Z4 Canada 604-588-0605 Basic Kit $12500 Pre-Buift Kit- $32500 laddslsoosftHl Send Check Money Order ATIONS Wingspan50 Wing Area500 sq Length34 Weight3/2 4 lbs TERMSU Engine25 40 Check Money Order COD Cash Add $400 Shipping Add $300 COD Arizona Reaidents add 6% Sales Tax BACK BY POPULAR DEMAND FUMTOFLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE KIT FEATURES Built Up Wing & Fuselage Select Balsa Spruce & Light Plywood Parts Machined & Fitted Photo Illustrated Construction Book Complete Hardware Package DEALER Tn-Gear Tail Dragger INVITED i vi 1 Wna wu m 1 15 1 i m aa u —.a uinaa. m I flCA 1 ThAUC5 U 9 South Plaza Way #335Flagstaff Arizona 86001 fire up engine leave running rich long period time Bring up rich two-cycle allow run wide open its running needle out solid two-cycle continuously until fuel runs out Occasionally pinch fuel line en gine solid two-cycle make peak Quickly release fuel line needle en gine back slightly rich condition Repeat steps running out two three 10-to12-ox tanks fuel using ear protec tion doing arent Ed Now install prop caliber intend race Start engine slowly bring peak Check pinching fuel line seeing rpm increases releasing fuel line rpm doesnt rise pinch line running too lean Back offi engine reaches its peak speed read rpm tach record value Stop engine remove pipe start cutting length header quarter-inch increments After cut reinstall pipe reneedle engine its peak Read record rpm Con tinue doing until rpm no longer increases approximate length want run pipe alrcraft Actually may have go slightly shorter since engine unloads air pipe would tune pipe slightly shorter length what established test stand suggest first try air proper length estab lished test stand Lastly super engine will no good prop pipe pipe length etc working together Again combination things contribute top operation Most importantly must able fly aircraft consistently around pylonswhich requires practice fastest model world will always finish last cant bend around poles have written article hopes rank beginners will understand ben efit Obviously methods improving engines performance cheating other cheeks changes etc re quire dollars spare parts special tools some expensive purpose Sport Pylon use basically box-stock en gines would rather stay away types mods As mentioned first lines article right combination ingredi ents will competitive circuit Thanks Dennis OBrian good thoughts feel necessary modif engine need Formula Good luck PS have ideas helpful hints would benefit fellow flier send can pass along Please note new address given very top column Corn puters/Evans Continued page 60 last theyre running down quicker can keep track lasf re charged cycled battery packs keeping track recycling times youll know its time replace batter ies Youll know its time disassem ble engines whether different types fuel give less fouling computer better house full servants Its cheaper too Let look after tedious tasks model building several free programs show calculate plot alrfoils varying chords Ask computer friends check lo cal bulletin boards programs programs thatll print out wing rib patterns according specifica tions Ive seen inexpensive computers such Commodore-64 spend days hunched over drafting board can building flying Finally more simple computer programs showing up maga zines like such things calcu late appropriate center gravity match propeller specifications power drag factors figure out efficient fuel mixture may have type programs computer once youve done can share other members club between clubs member typed pro gram youd have club library Youll find time spend paid back times over time save avoiding hand cal culations dream scratch builders Scale en thusiasts able draft plan quickly easily change di mensions whenever want isnt pipe dream exists Computer Assisted Design CAD programs theyre readily available IBM- Macintosh-type computer Once youve en tered blueprint can modify change its scale size seconds youre happy results can restore original wink CAD systems neednt expensive Some low cost ones sell around $75 club could easily create librar ies plans exchange Im just walting see plans service will first supply blueprints three-view diagrams programs No RC club should computer first use jumps mind keep ing membership lists way nobody forgotten membership renewals can tracked dues can collected fairly Amazingly members wholl swear paid human collector last month promise pay next week will cough up confronted computerized state ment guess weve programmed creditors computers No club member wants spend hours bal ancing books could out flying Likewise no auditing committee wants burn out its collective eyes trying decipher hieroglyphics gen eral ledger Theyd rather use eyes track planes lot inex pensive free accounting programs lying around computerized accounting pack age will reduce treasurers bookkeep ing time 10 15 minutes month Better yet audit committee can check over printed reports during coffee break person turning out newsletter will job almost willingly have computer system Youll surprised much quality newsletter will improve youll able get items print hours instead daysso members will learn about last-minute changes Pattern con test week before event rather month after Systems run newsletter vary may have simple word processing pro gram lets print correctly punctu ated grammatically correct articles simpleand inexpensivedot matrix print er other end scale may have desktop publishing system lets 148 Model Aviation
Edition: Model Aviation - 1988/09
Page Numbers: 57, 146, 147, 148
ENGINE PREPARATION subject teresting article have just read appeared SEMPRA newsletter Im sure its author Dennis OBrian wont mind passing wrote primarily Sport Pylon enthus iasts basic principles hold true Py ion classes What makes winner Racing aircraft design Propeller technology Engine Flying skills What answer simple Its ingredientsplus pinch luck large pinch chatter throughout pits race fast persons going usually followed cheated up engines Well being time another have accused such underhanded tactics am tell long-awaited article will reveal almost secrets sit down get comfortable read picking engine look several ex amples brand have decided pur chase its possible cant purchasing via mail order Feel drag ging roughness rotating crankshaft piston off compression tells case machining crankshaft clearances ad equate Further roughness gritty spots de tected may tell presence metal par ticles assembly other foreign matter may engine factory others have already turned engine over may already have damaged critical sealing areas between piston liner Open exhaust port look vertical scratches sleeve slowly move piston upward look vertical scratches gouges its sur face especially toward top piston detect best bet move other engine choice pastes above checks look closely top edge piston Ideally want see small shiny area about 1A6 /32 wide around top edge piston piston skirt meets piston top ring should remain consistent possible varying width goes around much piston can see through exhaust port consistency tells mating surfaces piston sleeve rela tively round true An uneven ring may due out-of-round piston and/or sleeve such being conducive good seal hence leading loss power Now remove glow plug en gine turn engine slowly top dead cen ter feel very distinct grab piston approaches top dead center requires some effort continue moving piston through area top dead centerand other prerequi sites have passed check go ahead buy engine Note some engines grab slightly others Now have jewel home real fun begins Find yourself nice bowl cere al bowl works great fill half full lac quer thinner acetone Lay out paper towel disassemble engine Start backplate cylinder head carburetor etc until bolt-on components have removed Remove cylinder liner inserting hard wood dowel through top sleeve gle end exhaust port Bolt old prop onto crankshaft rotate shaft very slowly will result piston forcing sleeve out engine case sleeve will come out may have heat crankcase around perimeter sleeve torch means nor try pry sleeve out using screwdriver other metal object Further need secure crankcase working engine squeeze case vise may use vise simply secure engine-mounting lugs vise jaws Remember distort sleeve case other engine parts may well throw parts away start over may know have damaged component cannot emphasize enough importance gen tle handling prying using vise oper ate engine Once sleeve out remove piston-androd assembly carefidly sliding lower end rod off crankshafts crankpin al low components drop through top crankcase Important Mark rear con necting rod piston-and-rod assembly restored its correct orientation engine reassembled Slide crankshaft out rear crankcase remove rear crankshaft bearing should wrap rag folded-over pa per towel around cylinder portion crank case may held firmly case being heated torch area bear ing case reasonably hot rap rear case sharply piece wood until rear bearing falls out Now heat case area front crankshaft bearing Insert dowel through crankshaft hole place end against rear front bearing Rap end dowel hammer until bearing comes out front case Now disassembled place bear ings bolts crankshaft propeller drive washer cone bowl lacquer thinner Using acid brush other suitable tool clean parts thoroughly rinse com pletely thinner ideal case air hose should used blow liquid out bearings after cleaning available use stream water turning bearings rinsing water used check make sure bearings spin freely submerge thinner again before placing pa per towel dry Remove other parts thinner after Continued page 146 September 1988 57 Radio Control Pylon Racing Bill Hager 4HollySpiingsDr Conme TX 77302 Jim Greer R holds Denight Special Gary Ponnell hooking up fuel line Ed Rankin R Dave Layman calling Ed has flying Formula since 1967 still winning Recommended charge current Article index Ni-Cd cell weights DC-DC Super Charger mod parts list Connector wire resis tance Leisure 05 perform ance Caliph power systems Astm 15 props/power Geared Astro 05 15 props/power Popular equipment 85 Electric Fly 19 Weight Importance Plane/power system Radio servo receiver battery Covering Framework examples 20 Wfring Size/kind/loss/weight Soldering Connectors Auto model chargers Organizer Twins 6/85 9/85 4/87 9/87 12/87 2/88 2/88 7/88 8/88 3/86 1/84 4/84 8/87 1/84 1/84 4/84 10/84 11/84 2/84 10/87 12/87 2/84 2/84 3/85 7/85 2/86 6/87 So ends another columnalbeit somewhat unus ual hope find useful doing couldnt help think useful master index Electric articles magazines last 15 years would Would ever killer project Next month back normal column format Please forward comment question SASE please photo ad dress given very top column Thanks five years fun everyone RC Helicopters/Jolly Continued page 56 side frames tail tube gyro mount engine mount bearing mounts made fa miliar friend aluminum However landing gear tail rotor housing washout assembly blade grips blade mounts tail rotor mounts bellcranks yoke main reduction gear tail rotor blades molded fiber-filled plastic rest X-Cell made accepted materials Included smoked Lexan canopy all-metal inline swashplate metal clutch steel starting shaft both main tail rotor shafts centerless ground hardened steel As layout X-Cell conventional two side frames trapping engine mounts bearing mounts tail tube engine mounted vertically glow plug pointing aft starting shaft positioned forward main rotor shaft main reduction gear nylon has tail-rotor-drive takeoff track molded side covered least mistake 60-size X-Cell has ball bearings something rotates would expect control system virtually slop-free featur ing four-point attachment swashplate Col lective pitch activated via mixer roll servo output arm Using method 200 col lective pitch travel possible fore-and-aft cyclic pitch elevator servo mounted unique position just aft main rotor shaft its pushrod both straight short As matter fact pushrods straight runs course adds precise response al ready tight controls As far physical statistics go X-Cell 60 has overall length 53 height 16 main rotor diameter 57 engine-torotor reduction gear ratio 91 feature unique X-Cell use delta hinge tail rotor Theoretically reduces effect side gusts machine cant tell difference tell truth feature interesting Making use stock flybar weights adjust able head dampening wide collective range produces very adaptable machine can made respond needs wide range fliers novices all-out aerobatic perform ers looking X-Cell should get accessories designed adaptable other machines First would Rotor-Sport blades have proven give great performance well made ex hibit good characteristics during aerobatics cluding autorotations have commend Miniature Aircraft its use sticky-back vinyl blade covering excellent choice nd will lift off use Also available Magna pipes ex haust system allows smooth power keeps mass Helicopters longitudinal centerof-gravity As mentioned earlier instruction manual excellent Following letter will yield very easily built smooth-flying aerobatic per former After flying X-Cell have say few machines will match its flight performance probably best-rolling Helicop ter available today Just before mailed off months colusim magazines editorial office Ted Schoonard kindly sent photos some accessories X-Cell noteworthy Quick Silver version basically three-piece lightweight fiberglass molding turns stock X-Cell full-bodied FM-style machine addition 10 oz all-up weight mechanics have modified ac cept fuselage Merely remove canopy tail rotor housing install two fuselage halves over mechanics Theres real good thinking total adjustments can made removing mechanics shell will report other updates later column am now getting close running out space summary would like state X-Cell combination quality parts sound cur rent Helicopter design thinking brought together great kit yielding Helicopter great performance Because Schoonards strong interest improving products expect will see still excellent products coming years now personal note Wait Schoonard has very ill during first part 1988 behalf fraternity RC Helicopter enthusi asts congratulate Walt X-Cell wish speedy recovery can get back Helicopters love much BCNU RC Pylon Racing/Hager Continued page 57 brush cleaning place paper towel Spray fine mist WD4O other com parable lubricant parts Inspect interior crankcase flash sharp edges around ports machined areas spect carefully presence foreign materi al Using #11 X-Acto blade gently clean rough and/or sharp edges Inspect area sleeve goes case high spots rough edges detected wrap piece #400or #600-grit wet/dry sandpaper around fin ger dowel spray some WD4O sandpa per gently rotate sandpaper bore area Inspect rear crankcase cover appears crankshaft hitting cover some places polish rear covers face portion faces crankshaft things assem 146 Model Aviation I I II U UHuA Send $1 tO toupon lsrwithysurssme andsddresallsADDRESS MlcroMark 340-569Snyder Ave flvkeIeYHIhta NJ O722CITYSTATEZIP3 -7 top 9 t3t t98 UJzttru tats oattng tampionzjip CaUJornia contest attracts soar,nqs Jinest atuL rewards winners cask Lovesongs hindsongs Canianos dominated winners circLe capturing 7 oJ top spots Jrotn top JoCows Dave 1an&s Lovesong Steve CLasen klindsong Bob Dodqson song Shown Lenci song Brad CLasen Super Cansano Steve CaUup Windsong Jim Kirstine dsong shown photo ir Send 2 stamps free cata[og SON DESIGNS 21230 Damson Road Bothell WA 98021 206 776 -8067 Mon 9 am 5 pm bled piece 400/600 wet-or-dry sandpa per Make sure rest paper rigid per fectly flat surface sueh piece glassbetter yet piece marble Spray sandpaper WD4O before polishing crankcase cover Move cover over sandpaper figure eight motion until rub marks re moved Another way cure problem add extra gasket rear cover reassembling engine provided engine uses gas ket joint wont work Rossi example since engine uses 0-ring seal area Carefully clean rinse parts thinner spray WD4O Begin reassembly placing bearings freczer no joke about half-hour Heat front crankcase front bear ing area Take cold bearing freczer place front crankshaft use crankshaft tool insert bearing case front scheme allows snout shaft align bearing hole Gently tap rear crankshaft press bearing case Remove crankshaft bearing place bard round object having diameter less bearing agalnst front bearing Tap object until bearing fully seated case properly sized socket socket-wrench set ideal tool task Use similar procedure reinstalling rear crankshaft bearing Use dowel against rear crankshaft tapping seat bearing Remove crankshaft once agalo use socket other suitable object press agalnst rear bearing make cer tain completely seated Now slide crankshaft engine spin crank case should spin freely rock back forth after being released slowing down no drag crankshaft does spin freely bolt prop onto shaft heat crankcase areas front rear bearings tap gently crankshaft fore aft crankshaft still completely free remove once again check bearings foreign material Pay particular attention area bore case between front rear crankshaft bearings crankshaft rub bing area should polish case piece 400/600 wet-or-dry sandpaper wrapped around dowel approximately diameter bore Remember spray WD4O before rotating bore area case Take small step time because shaft must seal area engine run ning Make trial fits frequent intervals Fully clean out case bearings thinner before reinserting crankshaft can out removing bearings unless foreign mate rial gets bearings cant rinsed out drag still after youve tried procedures check crankshaft runout bearings proper seating Once youre satisfied crankshaft area reinstall piston-and-rod assembly back case rear rodwhich marked disassembled itfacing rear engine careful scar sides piston Reset connecting rod crankpin set piston bottom dead center Very carefully slide sleeve top case about halfway Slowly rotate crankshaft bring pis ton up bottom sleeve Put finger down through sleeve use steer top piston sleeve push sleeve fully case Twist sleeve around care fully exhaust intake ports line up openings crankcase Look through exhaust port line up transfer boost ports look down through sleeve top help line up exhaust port Next reinstall cylinder head placing attaching bolts until hand tight begin gradually tightening bolt se quence using crossing pattern ie front bolt rear bolt left front right rear etc until tight Now oil bearings crankshaft piston/sleeve parts Marvel Mystery Oil similar lubricant pouring intake exhaust areas well open back engine Hand crank engine old prop place making sure feels loose off com pression pops back forth easily flipped through compression seems OK install backplate Once again use crossing pattern tightening up bolts Finally install carburetor prop drive washer havent already done test run break engine fol lowing steps should taken Bolt exhaust header engine Make sure headers opening same size exhaust port engine its use Dremel tool files header bring about match two openings Place engine test stand fill tank same type fuel used racing 12 V2% 15% nitro Hook up rod carburetor throttle arm install proper tuned pipe its pressure fitting connected fuel tank Install un loaded prop 8 x 6 paddle prop works fine BATT- CHEKk Saves Time . Saves Models Install RC Models 3-Level indication receiver battery status press button Precise Rugged Small Light 1/2 oz Made SA Also custom units other applications Order Today $1495 dealer send check money order postpaid Protune Corp 914 462-6452 PO Box 1808 Poughkeopsle NY 12601 INY State residents add sales taxi September 1988 147 High Performance Models presentsthe ECL IPSE Designed Henry Piorun Former Canadian National Champion FAI Canadian Team Member Designed Specifically FAI Pattern Flying Perform Equally Well Other AMA Classes Plug Wings rglass Belly Pan Pre-Cut Holes Wing Joiner Tubes Ultralight Honeycomb Win gcores extra $35 Optional Plastic Fiberglass Canopy Fibergiass Fuselage molded wing Joiner tube HIGH PERFORMANCE MODELS 9556116 St North Delta British Columbia 6Z4 Canada 604-588-0605 Basic Kit $12500 Pre-Buift Kit- $32500 laddslsoosftHl Send Check Money Order ATIONS Wingspan50 Wing Area500 sq Length34 Weight3/2 4 lbs TERMSU Engine25 40 Check Money Order COD Cash Add $400 Shipping Add $300 COD Arizona Reaidents add 6% Sales Tax BACK BY POPULAR DEMAND FUMTOFLY SPORTS AIRCRAFT SLOW AND STABLE WITH 25 ENGINE FOR TRAINING FAST AND FULLY AEROBATIC WITH 40 ENGINE KIT FEATURES Built Up Wing & Fuselage Select Balsa Spruce & Light Plywood Parts Machined & Fitted Photo Illustrated Construction Book Complete Hardware Package DEALER Tn-Gear Tail Dragger INVITED i vi 1 Wna wu m 1 15 1 i m aa u —.a uinaa. m I flCA 1 ThAUC5 U 9 South Plaza Way #335Flagstaff Arizona 86001 fire up engine leave running rich long period time Bring up rich two-cycle allow run wide open its running needle out solid two-cycle continuously until fuel runs out Occasionally pinch fuel line en gine solid two-cycle make peak Quickly release fuel line needle en gine back slightly rich condition Repeat steps running out two three 10-to12-ox tanks fuel using ear protec tion doing arent Ed Now install prop caliber intend race Start engine slowly bring peak Check pinching fuel line seeing rpm increases releasing fuel line rpm doesnt rise pinch line running too lean Back offi engine reaches its peak speed read rpm tach record value Stop engine remove pipe start cutting length header quarter-inch increments After cut reinstall pipe reneedle engine its peak Read record rpm Con tinue doing until rpm no longer increases approximate length want run pipe alrcraft Actually may have go slightly shorter since engine unloads air pipe would tune pipe slightly shorter length what established test stand suggest first try air proper length estab lished test stand Lastly super engine will no good prop pipe pipe length etc working together Again combination things contribute top operation Most importantly must able fly aircraft consistently around pylonswhich requires practice fastest model world will always finish last cant bend around poles have written article hopes rank beginners will understand ben efit Obviously methods improving engines performance cheating other cheeks changes etc re quire dollars spare parts special tools some expensive purpose Sport Pylon use basically box-stock en gines would rather stay away types mods As mentioned first lines article right combination ingredi ents will competitive circuit Thanks Dennis OBrian good thoughts feel necessary modif engine need Formula Good luck PS have ideas helpful hints would benefit fellow flier send can pass along Please note new address given very top column Corn puters/Evans Continued page 60 last theyre running down quicker can keep track lasf re charged cycled battery packs keeping track recycling times youll know its time replace batter ies Youll know its time disassem ble engines whether different types fuel give less fouling computer better house full servants Its cheaper too Let look after tedious tasks model building several free programs show calculate plot alrfoils varying chords Ask computer friends check lo cal bulletin boards programs programs thatll print out wing rib patterns according specifica tions Ive seen inexpensive computers such Commodore-64 spend days hunched over drafting board can building flying Finally more simple computer programs showing up maga zines like such things calcu late appropriate center gravity match propeller specifications power drag factors figure out efficient fuel mixture may have type programs computer once youve done can share other members club between clubs member typed pro gram youd have club library Youll find time spend paid back times over time save avoiding hand cal culations dream scratch builders Scale en thusiasts able draft plan quickly easily change di mensions whenever want isnt pipe dream exists Computer Assisted Design CAD programs theyre readily available IBM- Macintosh-type computer Once youve en tered blueprint can modify change its scale size seconds youre happy results can restore original wink CAD systems neednt expensive Some low cost ones sell around $75 club could easily create librar ies plans exchange Im just walting see plans service will first supply blueprints three-view diagrams programs No RC club should computer first use jumps mind keep ing membership lists way nobody forgotten membership renewals can tracked dues can collected fairly Amazingly members wholl swear paid human collector last month promise pay next week will cough up confronted computerized state ment guess weve programmed creditors computers No club member wants spend hours bal ancing books could out flying Likewise no auditing committee wants burn out its collective eyes trying decipher hieroglyphics gen eral ledger Theyd rather use eyes track planes lot inex pensive free accounting programs lying around computerized accounting pack age will reduce treasurers bookkeep ing time 10 15 minutes month Better yet audit committee can check over printed reports during coffee break person turning out newsletter will job almost willingly have computer system Youll surprised much quality newsletter will improve youll able get items print hours instead daysso members will learn about last-minute changes Pattern con test week before event rather month after Systems run newsletter vary may have simple word processing pro gram lets print correctly punctu ated grammatically correct articles simpleand inexpensivedot matrix print er other end scale may have desktop publishing system lets 148 Model Aviation