WE WERE contest watching Combat airplanes just falling out sky dont mean hitting other werent capable flyingat least flying turning same time could better thought Sure would easy Wed design exercise see just what improved performance could con veniently little planes Three years have passed since getting at fly better hasnt come easily some difficulties solve CL ls beset problems because low Reynolds Number regime operate Everything works against props small inefficient Line airframe drag large relative thrust Worst wing sections airfoils compromised low maidmum lift coefficients poor lift/drag ratios compounded power deficien cies Cox TD 049 neat engine compared 15 35 cu Combat engines has poor power-to-weight ratio less power per cubic inch thing to give engine comprehensive hop-up Everything counts small increment im proved efficiency area will added together give us substantial performance crease basic design parameters Monoboom borrowed larger Monoboom FAI AMA airframes design charac teristics give spectacular results ap plied rame its inherently poorer efficiencies concept involves high aspect ratio wing compactness practical stream lining Area asymmetry planform trim alignment optimized absorb minimum power airplane turning hard suitable airfoil selected help out Wing loading aspect ratio main determinants turn radius airplane can achieve Mono does spectacularly fast stall free four-foot-diameter loops lighter loading would allow still tighter turns intro duce penetration stability problems gnsty turbulent air conditions models can built really light have much relative drag dont penetrate well cant exploit light loadings least real world conditions could fly inside building really still air lighter wing loading Monobooms 415 oz per sq ft could used winds over 12 mph would wish airplane heavier smaller either would increase wing loading improve penetration Mono aspect ratio AR seven to-one about best can given area speed envelope exists aerodynamically speaking narrow range optimum AR out optimum real quick because its small wing section loses effi ciency rapidly decreasing chord width higher AR wing area will produce airplane slower top speed bigger turn radius poorer penetration So will much lower AR Streamlining important aerodymanic device vital rol Line modeL Keeping simple weve done well could airfoil planform veryslippery Getting control linkage inside engine mounted flush its bearers tight stream lined nacelle helped dramatically still much can done engine cowling spinner lead-out connections inside wing hollow streamlined rudder enclose stabilator horn benefit overall perfor mance of things would significant also require substantial fabrication effort Iz 58 Model Aviation FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 bIUFIU BOOM I& I/I6 PLYWOOD BELICRANK MOUNT BLADDER TOP VIEWcDWARTNENT INBOARD LE SHEETINACAP JTRIPS B TOP CENTER 3/16 SO BALSA L ESHEETING OMITTED FORI/32VERT LEAD OUT GUIDEB LB SOFTCLARITYGRAB WEB 3/WnjnernItrn I/B 3A6 BALSA24 5OVSRALL LG SPARS ALB SOFT-----GIG V2A 2IOVERALL LGTH 005 AL HINGE____________ ________________ TRIM TAB DO MOT DELETE 1/ 01B MILTISTBAND/L.A LEAD-OUT LINESDUBAO BALL UNK V52 BASSWOOD DOBEERS V32 BALSA OR OPTIONAL STREAMLAFO RUDDER INO NEWEl VERY FAST .COX TD 045 -GEE TEXT FOR REWORKING ENGINE 2 LAABNATIO@B OF Ar BALSA TRIM LEFT BEE FOR CONTROL CABLE DENIER GECTION NEETING 1A6 I/4BBLSA CAPAYRFA VTAIL BOOM RUDDER DETAIL 202 FIBERGLASS PATTEAPI 7r7k LEKMID TRUNG-/ EDGE NACELLE 5 LA SOFT BALSA MILL OUT FOR MOUNTING ENABlE 35 S MAPLE MOTOR MOLBYS czz SILGR!EAN-VW BALSA 5 LB SOFT 10 REWIRED VB SOFT BALSA 2 REOD 1A6 BALSA SHEETING LB SOFT A-GRAB7 -4-Ziil7 _ El IjIB CAPSTBIPS ViA BALSA SOFT CENTER SECTION SHEETINGTOP BOTTOM IllII/ IIV32 VERY DENI4 WEB FROM CAPSYRIP YE SUPPORTS MATERIAL WING TlP WEIGI4T N\IIGRAM YE VRA BALSA B BOY YE GREETING lAB BALSAI2 CE / GLASS CLOTh MID LB ISOFTI C-GRAINHOT STIFF lOP ARE BOTIOM GOLDBERG FLEX POINT HINGE TRAINFD TO GAB WIOTH LINK\ PLYWOOD Hl OUBRO RUBSTIFF S 3ILNI*4 030 CAINE ASSENRY 2 CE GLASS cAmH HOT STIFF TOP MID BOTTOM STABILATOR RIMPUFD STARLATE MHGF GLASS B HOT STIFF TOP B BOTTOIA LONG PANEL OF STAB __ reOABO~ ILATOR — BACELLE2AMED BALSA FIlER CR-ABlEk-vBmqASS TImIG HORNTAP 2 56 MOLINTTAP OLT DRAd mcsEi I4OPELT ISA ALIAI ROD STARILATORnfWIp5n BY MOPPELE GROUP TEAM PLUIS 2AXLE—I counci moms se ISTAB CONTROL OEIMRCO Perhaps better have airplane fly never gets built Construction assembly sequence has worked best us Cut out wood parts champher TE sheeting Sub-assemblies order inclusion wing structure Bellcrankcut leads 21 24 long attach install ball link mount platform Cable attach socket Engine mount glue up cut lug reliefs drill install blind nuts Nacelleglue up fit engine blind nut clearance Wing tipsapply fiberglass properly broken-in tuned TO 049 develops enough power pull plane 82 mph fast say Author says time yours stiffeners Boomglue up drill finish andepoxy bushings Stabilatorshape add fiberglass Continued page 150 j-PlN---3/lesQ~jSQzj LIE ON BOARD IfRE/i sketch better words describing authots method bulidina wino September 1982 59 ON 019 DEPTh SAUGE/ / lAB C-GRAIN BALSA IGOFfl WING TIPS single-point lead-out guide formed crush ing5/32-in brasstubing feelergauge Pr cision fit groups tracks lead-outs minimum drag Litti things add up tlgnT ana streaminea naceiie improves airnow snrougn propeller disc increases props efficiency Good engine tips text determine prop size let us assume dyna mometer measurement has made super engine giving peak hp 5000 rpm n583 revs/sec Using hp multiply ing efficiency 81 enter Figure 2 1134 Drag Horsepower find speed 165 mph perfect pilot interesting note pilot can engine question lose system about 8 mph Finally Figure 7 note range values over d may vary limited J both speed V engine revs per second n now fixed spread shown Table 3 ComputedfromthedefinitionofCponFigure 7 shows diameter 488 ft 586 UsingJ 85 Cp06 inFigure7 sets Wd ratio 092 Note propeller diameterd applies two-bladed prop translate one-blader multiply d constant 115 results one-blade diameter of67 inches p/d ratio unchanged 092 giving pitch 61 inches dimensions one-bladers used 1981 team trials 65-in diameter 6-in pitch speed turned 165 mph better conversion multiplier going twoblade one-blade might 112 terms present practice detailed design pro cedure giving information chord distribu tion pitch distribution available Refer ence 7 References I Analytic Experimental Tools useful Select ing Developing Power Model Propellers D Monson NFFS Symposium 1980 2 Drag Control Lines Models H Jex et aL 195 1-52 Model Aeronautic Yearbook 3 BookFluid Dynamic Drag S Hoemer Inter ference Drag Two Circular Cylinders 4 BookMechanics Seely EnsignThe Conical Pendulum 5 Choosing Best Wakefield Propeller Meuser NFFS Sympo 1970 6 Propellers made Painless D Mendel NFFS Sympo 1970 7 Analytic Design Propellers having Minimum Induced Loss E Larrabee NFFS Sympo 1977 hope time readers column make attempt fly FAI Speed will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed Column Once again thanks Charlie Lieber wil lingness share much information us Gene Hempe 301 North Yale Dr Garlan4 TX 75042 Monoboom A/Hoffelt Continued page 59 stiffeners finish assemble boom Assembly Mark cut lead-out holes inboard ribs Pin bottom spar work board Lay ribs Make full-span jig proper height position bottom trailing edge jig -in behind ribs Square pin ribs trailing edge Work top spar square ribs space center engine mount Use cyano acrylate glue CA joints Cut nose off rib behind bladder compart ment Glue leading edge Pull pins bottom trailing edge Glue top trailing edge 30-mi epoxy Pin two inches Glue top leading edge sheet 30-mi epoxy Pin inch good trick pin through full-span strip 3/16 sq TE LE sparthis will hold 1/16 sheet Great Planes. Two favorite R/C classics Ask name Either way cant go wrong because both truly Great Planes Trainer 60TM daddy line favorite R/C modelers big 60 wingspan better stability plus plenty room installing radios y great looking design builds up fast can spend time air bench Precision machine cut sanded parts tricycle gear good ground handling. great looking design thats bound draw attention . performance proves beauty can skin deep use 40 engine youll have nice manageable beginning trainer Less $7795 KaosTM No wonder Kaos worlds popular choices comes time graduate low wing design build maintain kind aerobatic performance steals show time thanks famous Kaos tapered wing design. Made precision machine cut sanded parts fast easy assembly Less $7795 Thirty-four Great P Trainer 5 Trainer 10 Basic Trainer Trainer 20 Trainer 40 GLA 40 Trainer 60 Big Birdy Soar Birdy Tweedy Bird Dirty Birdy 40 Dirty Birdy 60 Super Sportster 40 Sun Hi 420 Quickest 200 Quickest 500 553j Kaos Super Kaos 40 Super ltaos 60 JEO Deception Cosmic Wind Rearwin Speedster Chipmunk Corbin Ace Kraft Super Ft CAP 20L AT-6 Texan P51 Mustang F7 Tigercat T28 Aerocommander Shnke Lockheed Sirius 150 Model Aviation shown installed 1Jreat Planes popular rainer bO key summer R/C fun Plus. two great new accessories Great Planes Switch n GIQwTM Now can forget about engine flameouts during low throttle maneuvers turning last winters work love pile spare parts U Switch n GlowiM Great Planes new on-board ignition system links throttle servo Pull throttle back lightweight battery pack puts glow back glow plug throttle setting desire As soon throttle up Switch n Glow cuts outE Its easy install lightweight affordable Great scale builders dont want cut holes engine cowlings starting Also ideal competition pattern flyers cant afford flame-out wrong time mention boaters last time flameout middle lake Dont take chances favorite R/C project Buy Switch n GlowiM Its insurance cant af ford Less $2495 complete SportFloats er go out lake can fish swim. can go seaplaning Great Planes new SportFloats 31 foam core floats handle large 60 size designs floats build up fast easy Just install landing gear blocks foam cores cover balsa ply sheeting included finish off favorite lake river new R/C thrills youre bound enjoy thanks SportFloats Less $2895 QAWINGcEP MO favorite R/C dealer PO BOX 721 URBANA ILLINOIS 61801 217/367-2069 place like vise will keep straight Add spar webbing trailing edge supports cap strips Flip wing upside down re-pin Trim leading edge bladder compartment add spar web area Glue cut-off rib web bladder area leading edge sheeting goes epoxy dry check loose joints Install bellcrank assembly Notch wing cable outlet Drill through rib install cable Glue center sheeting Sand wing Cut away sheeting install engine mount Mask blind nuts glue nacelle epoxy Fiberglass front end pattern shown plans Cut bladder access Finish wing tips lead-out guide Add tip weight Cover wing Fit booni Cut cable housing epoxy cured solder connector Add fuel pinch off Use contact cement trim tab rudder Engine Now plane finished grab TD 049 .. wait minute want Mono ly smoke TD will probably need little tuning great deal myth floating around regarding extraction horsepower engines spent few weekends test stand sorting through possibilities Right off take new motor apart wash out metal bits Throw needle valve assembly trash go buy fine-thread replacement unit made Kustom Kraftsman ship Ace RC youre shopping get half doxen GloBee competition glow heads connecting rod reset tooL connecting rod retaining socket piston weakest link engine socket will pound itself sloppy during break-in will have reset Several reset tools available dealer prefer unit made Davis Diesel Develop ment includes jig prevent piston distortion Drill venturi 125 carefully reassemble engine two gaskets under glow head seems three pertinent factors lA engine performance fuel compression state engines break-in factors closely interrelated change necessitates adjustment others obain optimum power First no such thing fuel too hot TD 049 snot traditional ingredi ents open exhaust configuration anyway little engines have very high surfacearea-to-displacement ratio al ways run too cold practical minimum horsepower search 40% nitro Best tested 75% nitro 10% propylene oxide 15% Klotz generally six eight hundred rpm faster 40% 22000 range hottest fuels cylinder head temperature didnt go over 390 degrees best power setting below what needed best thermal efficiency indi cates could use hotter fuel rye told current Klotz oil has substantial castor content dont know behaved though did lubricating well buming leanish settings have read TD instruction sheet might think couple rich runs ground will have new 049 Combat engine ready will always use 10% nitro exploit high-nitro fuels make horsepower protracted break-in necessary TD piston grows heat-cycled running cooling Higher temperature ranges September 1982 151 PrnG1 TUNGSTEN CARBIDE Mans Hardest Material next Diamond LIFETIME SANDING TOOLS 4 -tF - RADIUS TOOL 2 TOOLS IN ONE MONEY BACK 7 GUARANTEE 3/4 Radius TOOL Ohio add 6% sales tax $695 pp Check Money Order No GODS Wholesale & Dealer Inquiries Invited D G PRODUCTS CO 209 CARRIANDS DR DAYTON OHIO 45429 high nitro fuels make grow still What needed enough running stabilize swell ing pistonand wear proper fit its cylinder process cant rushed lots intro lean settings applied too soon piston will galland show dull scratched surface actually swollen piston pressing hard against cylinder wall metal rubbed torn off galls badly will distort surfaces piston cylinder engine will never make much power Start medium-nitro fuel two gaskets under glow head Use prop cut diameter sufficiently allow approximately 18000 rpm engine just breaking two-cycle Run engine about three minutes time checking piston galling between runs starts gall richen setting run way until piston appears polished Tight en gines can have break-in hastened apply ing Fox Lustrox polishing abrasive piston between runs Dont run Lustrox through putting venturi Just mix little fuel dab exhaust port between runs engine will hold peak power setting three minutes sagging galling piston change high-nitro fuel will using fly Remove two head gaskets hot fuel 40% nitro less Go through break-in running sequence until full power setting can held three minutes trauma Now have elusive pistomcylinder fit sought after lA enthus iasts best performance compression must set particular fuel mix done adding removing gaskets under glow head greater fuels nitro content lower compression must washers GloBee Racing glow head better comes engine consistently tests 200 faster stock has mechan ically superior clamping arrangement less costly final compression setting best done test stand will need good tachometer will discern changes 50 rpm Take readings range head settings will see pattern Allow engine stabilize come up temperature reading Gen erally speaking GloBee head tight rod gasket good 40% two 75% engines differ lotyours might odd will pay test Okay TD ready bolt Mono ViA best performing prop have found Windsor Master Airscrew 5A x 4 Use 012 35-ft multi-strand lines may Force US FF Champs/Meuser Continued page 65 regular Mulvihill eventmodels built tuned survive rigors thermal flying few modelers build especially-light models trim still-air conditions modelers Bob White won event its first four runnings Consequently eyes him launched familiar twinfin modeL climbed flawlessly two minutes altitude perhaps 500 ft before beginning its majestic circling glide landing 10 mm 49 sec later within 50 yards launch ing point giving White fifth consecutive win possession Oakland Cloud Dusters Perpetual Trophy yet another year Inasmuch 152 Model Aviation
Edition: Model Aviation - 1982/09
Page Numbers: 58, 59, 150, 151, 152
WE WERE contest watching Combat airplanes just falling out sky dont mean hitting other werent capable flyingat least flying turning same time could better thought Sure would easy Wed design exercise see just what improved performance could con veniently little planes Three years have passed since getting at fly better hasnt come easily some difficulties solve CL ls beset problems because low Reynolds Number regime operate Everything works against props small inefficient Line airframe drag large relative thrust Worst wing sections airfoils compromised low maidmum lift coefficients poor lift/drag ratios compounded power deficien cies Cox TD 049 neat engine compared 15 35 cu Combat engines has poor power-to-weight ratio less power per cubic inch thing to give engine comprehensive hop-up Everything counts small increment im proved efficiency area will added together give us substantial performance crease basic design parameters Monoboom borrowed larger Monoboom FAI AMA airframes design charac teristics give spectacular results ap plied rame its inherently poorer efficiencies concept involves high aspect ratio wing compactness practical stream lining Area asymmetry planform trim alignment optimized absorb minimum power airplane turning hard suitable airfoil selected help out Wing loading aspect ratio main determinants turn radius airplane can achieve Mono does spectacularly fast stall free four-foot-diameter loops lighter loading would allow still tighter turns intro duce penetration stability problems gnsty turbulent air conditions models can built really light have much relative drag dont penetrate well cant exploit light loadings least real world conditions could fly inside building really still air lighter wing loading Monobooms 415 oz per sq ft could used winds over 12 mph would wish airplane heavier smaller either would increase wing loading improve penetration Mono aspect ratio AR seven to-one about best can given area speed envelope exists aerodynamically speaking narrow range optimum AR out optimum real quick because its small wing section loses effi ciency rapidly decreasing chord width higher AR wing area will produce airplane slower top speed bigger turn radius poorer penetration So will much lower AR Streamlining important aerodymanic device vital rol Line modeL Keeping simple weve done well could airfoil planform veryslippery Getting control linkage inside engine mounted flush its bearers tight stream lined nacelle helped dramatically still much can done engine cowling spinner lead-out connections inside wing hollow streamlined rudder enclose stabilator horn benefit overall perfor mance of things would significant also require substantial fabrication effort Iz 58 Model Aviation FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 bIUFIU BOOM I& I/I6 PLYWOOD BELICRANK MOUNT BLADDER TOP VIEWcDWARTNENT INBOARD LE SHEETINACAP JTRIPS B TOP CENTER 3/16 SO BALSA L ESHEETING OMITTED FORI/32VERT LEAD OUT GUIDEB LB SOFTCLARITYGRAB WEB 3/WnjnernItrn I/B 3A6 BALSA24 5OVSRALL LG SPARS ALB SOFT-----GIG V2A 2IOVERALL LGTH 005 AL HINGE____________ ________________ TRIM TAB DO MOT DELETE 1/ 01B MILTISTBAND/L.A LEAD-OUT LINESDUBAO BALL UNK V52 BASSWOOD DOBEERS V32 BALSA OR OPTIONAL STREAMLAFO RUDDER INO NEWEl VERY FAST .COX TD 045 -GEE TEXT FOR REWORKING ENGINE 2 LAABNATIO@B OF Ar BALSA TRIM LEFT BEE FOR CONTROL CABLE DENIER GECTION NEETING 1A6 I/4BBLSA CAPAYRFA VTAIL BOOM RUDDER DETAIL 202 FIBERGLASS PATTEAPI 7r7k LEKMID TRUNG-/ EDGE NACELLE 5 LA SOFT BALSA MILL OUT FOR MOUNTING ENABlE 35 S MAPLE MOTOR MOLBYS czz SILGR!EAN-VW BALSA 5 LB SOFT 10 REWIRED VB SOFT BALSA 2 REOD 1A6 BALSA SHEETING LB SOFT A-GRAB7 -4-Ziil7 _ El IjIB CAPSTBIPS ViA BALSA SOFT CENTER SECTION SHEETINGTOP BOTTOM IllII/ IIV32 VERY DENI4 WEB FROM CAPSYRIP YE SUPPORTS MATERIAL WING TlP WEIGI4T N\IIGRAM YE VRA BALSA B BOY YE GREETING lAB BALSAI2 CE / GLASS CLOTh MID LB ISOFTI C-GRAINHOT STIFF lOP ARE BOTIOM GOLDBERG FLEX POINT HINGE TRAINFD TO GAB WIOTH LINK\ PLYWOOD Hl OUBRO RUBSTIFF S 3ILNI*4 030 CAINE ASSENRY 2 CE GLASS cAmH HOT STIFF TOP MID BOTTOM STABILATOR RIMPUFD STARLATE MHGF GLASS B HOT STIFF TOP B BOTTOIA LONG PANEL OF STAB __ reOABO~ ILATOR — BACELLE2AMED BALSA FIlER CR-ABlEk-vBmqASS TImIG HORNTAP 2 56 MOLINTTAP OLT DRAd mcsEi I4OPELT ISA ALIAI ROD STARILATORnfWIp5n BY MOPPELE GROUP TEAM PLUIS 2AXLE—I counci moms se ISTAB CONTROL OEIMRCO Perhaps better have airplane fly never gets built Construction assembly sequence has worked best us Cut out wood parts champher TE sheeting Sub-assemblies order inclusion wing structure Bellcrankcut leads 21 24 long attach install ball link mount platform Cable attach socket Engine mount glue up cut lug reliefs drill install blind nuts Nacelleglue up fit engine blind nut clearance Wing tipsapply fiberglass properly broken-in tuned TO 049 develops enough power pull plane 82 mph fast say Author says time yours stiffeners Boomglue up drill finish andepoxy bushings Stabilatorshape add fiberglass Continued page 150 j-PlN---3/lesQ~jSQzj LIE ON BOARD IfRE/i sketch better words describing authots method bulidina wino September 1982 59 ON 019 DEPTh SAUGE/ / lAB C-GRAIN BALSA IGOFfl WING TIPS single-point lead-out guide formed crush ing5/32-in brasstubing feelergauge Pr cision fit groups tracks lead-outs minimum drag Litti things add up tlgnT ana streaminea naceiie improves airnow snrougn propeller disc increases props efficiency Good engine tips text determine prop size let us assume dyna mometer measurement has made super engine giving peak hp 5000 rpm n583 revs/sec Using hp multiply ing efficiency 81 enter Figure 2 1134 Drag Horsepower find speed 165 mph perfect pilot interesting note pilot can engine question lose system about 8 mph Finally Figure 7 note range values over d may vary limited J both speed V engine revs per second n now fixed spread shown Table 3 ComputedfromthedefinitionofCponFigure 7 shows diameter 488 ft 586 UsingJ 85 Cp06 inFigure7 sets Wd ratio 092 Note propeller diameterd applies two-bladed prop translate one-blader multiply d constant 115 results one-blade diameter of67 inches p/d ratio unchanged 092 giving pitch 61 inches dimensions one-bladers used 1981 team trials 65-in diameter 6-in pitch speed turned 165 mph better conversion multiplier going twoblade one-blade might 112 terms present practice detailed design pro cedure giving information chord distribu tion pitch distribution available Refer ence 7 References I Analytic Experimental Tools useful Select ing Developing Power Model Propellers D Monson NFFS Symposium 1980 2 Drag Control Lines Models H Jex et aL 195 1-52 Model Aeronautic Yearbook 3 BookFluid Dynamic Drag S Hoemer Inter ference Drag Two Circular Cylinders 4 BookMechanics Seely EnsignThe Conical Pendulum 5 Choosing Best Wakefield Propeller Meuser NFFS Sympo 1970 6 Propellers made Painless D Mendel NFFS Sympo 1970 7 Analytic Design Propellers having Minimum Induced Loss E Larrabee NFFS Sympo 1977 hope time readers column make attempt fly FAI Speed will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed Column Once again thanks Charlie Lieber wil lingness share much information us Gene Hempe 301 North Yale Dr Garlan4 TX 75042 Monoboom A/Hoffelt Continued page 59 stiffeners finish assemble boom Assembly Mark cut lead-out holes inboard ribs Pin bottom spar work board Lay ribs Make full-span jig proper height position bottom trailing edge jig -in behind ribs Square pin ribs trailing edge Work top spar square ribs space center engine mount Use cyano acrylate glue CA joints Cut nose off rib behind bladder compart ment Glue leading edge Pull pins bottom trailing edge Glue top trailing edge 30-mi epoxy Pin two inches Glue top leading edge sheet 30-mi epoxy Pin inch good trick pin through full-span strip 3/16 sq TE LE sparthis will hold 1/16 sheet Great Planes. Two favorite R/C classics Ask name Either way cant go wrong because both truly Great Planes Trainer 60TM daddy line favorite R/C modelers big 60 wingspan better stability plus plenty room installing radios y great looking design builds up fast can spend time air bench Precision machine cut sanded parts tricycle gear good ground handling. great looking design thats bound draw attention . performance proves beauty can skin deep use 40 engine youll have nice manageable beginning trainer Less $7795 KaosTM No wonder Kaos worlds popular choices comes time graduate low wing design build maintain kind aerobatic performance steals show time thanks famous Kaos tapered wing design. Made precision machine cut sanded parts fast easy assembly Less $7795 Thirty-four Great P Trainer 5 Trainer 10 Basic Trainer Trainer 20 Trainer 40 GLA 40 Trainer 60 Big Birdy Soar Birdy Tweedy Bird Dirty Birdy 40 Dirty Birdy 60 Super Sportster 40 Sun Hi 420 Quickest 200 Quickest 500 553j Kaos Super Kaos 40 Super ltaos 60 JEO Deception Cosmic Wind Rearwin Speedster Chipmunk Corbin Ace Kraft Super Ft CAP 20L AT-6 Texan P51 Mustang F7 Tigercat T28 Aerocommander Shnke Lockheed Sirius 150 Model Aviation shown installed 1Jreat Planes popular rainer bO key summer R/C fun Plus. two great new accessories Great Planes Switch n GIQwTM Now can forget about engine flameouts during low throttle maneuvers turning last winters work love pile spare parts U Switch n GlowiM Great Planes new on-board ignition system links throttle servo Pull throttle back lightweight battery pack puts glow back glow plug throttle setting desire As soon throttle up Switch n Glow cuts outE Its easy install lightweight affordable Great scale builders dont want cut holes engine cowlings starting Also ideal competition pattern flyers cant afford flame-out wrong time mention boaters last time flameout middle lake Dont take chances favorite R/C project Buy Switch n GlowiM Its insurance cant af ford Less $2495 complete SportFloats er go out lake can fish swim. can go seaplaning Great Planes new SportFloats 31 foam core floats handle large 60 size designs floats build up fast easy Just install landing gear blocks foam cores cover balsa ply sheeting included finish off favorite lake river new R/C thrills youre bound enjoy thanks SportFloats Less $2895 QAWINGcEP MO favorite R/C dealer PO BOX 721 URBANA ILLINOIS 61801 217/367-2069 place like vise will keep straight Add spar webbing trailing edge supports cap strips Flip wing upside down re-pin Trim leading edge bladder compartment add spar web area Glue cut-off rib web bladder area leading edge sheeting goes epoxy dry check loose joints Install bellcrank assembly Notch wing cable outlet Drill through rib install cable Glue center sheeting Sand wing Cut away sheeting install engine mount Mask blind nuts glue nacelle epoxy Fiberglass front end pattern shown plans Cut bladder access Finish wing tips lead-out guide Add tip weight Cover wing Fit booni Cut cable housing epoxy cured solder connector Add fuel pinch off Use contact cement trim tab rudder Engine Now plane finished grab TD 049 .. wait minute want Mono ly smoke TD will probably need little tuning great deal myth floating around regarding extraction horsepower engines spent few weekends test stand sorting through possibilities Right off take new motor apart wash out metal bits Throw needle valve assembly trash go buy fine-thread replacement unit made Kustom Kraftsman ship Ace RC youre shopping get half doxen GloBee competition glow heads connecting rod reset tooL connecting rod retaining socket piston weakest link engine socket will pound itself sloppy during break-in will have reset Several reset tools available dealer prefer unit made Davis Diesel Develop ment includes jig prevent piston distortion Drill venturi 125 carefully reassemble engine two gaskets under glow head seems three pertinent factors lA engine performance fuel compression state engines break-in factors closely interrelated change necessitates adjustment others obain optimum power First no such thing fuel too hot TD 049 snot traditional ingredi ents open exhaust configuration anyway little engines have very high surfacearea-to-displacement ratio al ways run too cold practical minimum horsepower search 40% nitro Best tested 75% nitro 10% propylene oxide 15% Klotz generally six eight hundred rpm faster 40% 22000 range hottest fuels cylinder head temperature didnt go over 390 degrees best power setting below what needed best thermal efficiency indi cates could use hotter fuel rye told current Klotz oil has substantial castor content dont know behaved though did lubricating well buming leanish settings have read TD instruction sheet might think couple rich runs ground will have new 049 Combat engine ready will always use 10% nitro exploit high-nitro fuels make horsepower protracted break-in necessary TD piston grows heat-cycled running cooling Higher temperature ranges September 1982 151 PrnG1 TUNGSTEN CARBIDE Mans Hardest Material next Diamond LIFETIME SANDING TOOLS 4 -tF - RADIUS TOOL 2 TOOLS IN ONE MONEY BACK 7 GUARANTEE 3/4 Radius TOOL Ohio add 6% sales tax $695 pp Check Money Order No GODS Wholesale & Dealer Inquiries Invited D G PRODUCTS CO 209 CARRIANDS DR DAYTON OHIO 45429 high nitro fuels make grow still What needed enough running stabilize swell ing pistonand wear proper fit its cylinder process cant rushed lots intro lean settings applied too soon piston will galland show dull scratched surface actually swollen piston pressing hard against cylinder wall metal rubbed torn off galls badly will distort surfaces piston cylinder engine will never make much power Start medium-nitro fuel two gaskets under glow head Use prop cut diameter sufficiently allow approximately 18000 rpm engine just breaking two-cycle Run engine about three minutes time checking piston galling between runs starts gall richen setting run way until piston appears polished Tight en gines can have break-in hastened apply ing Fox Lustrox polishing abrasive piston between runs Dont run Lustrox through putting venturi Just mix little fuel dab exhaust port between runs engine will hold peak power setting three minutes sagging galling piston change high-nitro fuel will using fly Remove two head gaskets hot fuel 40% nitro less Go through break-in running sequence until full power setting can held three minutes trauma Now have elusive pistomcylinder fit sought after lA enthus iasts best performance compression must set particular fuel mix done adding removing gaskets under glow head greater fuels nitro content lower compression must washers GloBee Racing glow head better comes engine consistently tests 200 faster stock has mechan ically superior clamping arrangement less costly final compression setting best done test stand will need good tachometer will discern changes 50 rpm Take readings range head settings will see pattern Allow engine stabilize come up temperature reading Gen erally speaking GloBee head tight rod gasket good 40% two 75% engines differ lotyours might odd will pay test Okay TD ready bolt Mono ViA best performing prop have found Windsor Master Airscrew 5A x 4 Use 012 35-ft multi-strand lines may Force US FF Champs/Meuser Continued page 65 regular Mulvihill eventmodels built tuned survive rigors thermal flying few modelers build especially-light models trim still-air conditions modelers Bob White won event its first four runnings Consequently eyes him launched familiar twinfin modeL climbed flawlessly two minutes altitude perhaps 500 ft before beginning its majestic circling glide landing 10 mm 49 sec later within 50 yards launch ing point giving White fifth consecutive win possession Oakland Cloud Dusters Perpetual Trophy yet another year Inasmuch 152 Model Aviation
Edition: Model Aviation - 1982/09
Page Numbers: 58, 59, 150, 151, 152
WE WERE contest watching Combat airplanes just falling out sky dont mean hitting other werent capable flyingat least flying turning same time could better thought Sure would easy Wed design exercise see just what improved performance could con veniently little planes Three years have passed since getting at fly better hasnt come easily some difficulties solve CL ls beset problems because low Reynolds Number regime operate Everything works against props small inefficient Line airframe drag large relative thrust Worst wing sections airfoils compromised low maidmum lift coefficients poor lift/drag ratios compounded power deficien cies Cox TD 049 neat engine compared 15 35 cu Combat engines has poor power-to-weight ratio less power per cubic inch thing to give engine comprehensive hop-up Everything counts small increment im proved efficiency area will added together give us substantial performance crease basic design parameters Monoboom borrowed larger Monoboom FAI AMA airframes design charac teristics give spectacular results ap plied rame its inherently poorer efficiencies concept involves high aspect ratio wing compactness practical stream lining Area asymmetry planform trim alignment optimized absorb minimum power airplane turning hard suitable airfoil selected help out Wing loading aspect ratio main determinants turn radius airplane can achieve Mono does spectacularly fast stall free four-foot-diameter loops lighter loading would allow still tighter turns intro duce penetration stability problems gnsty turbulent air conditions models can built really light have much relative drag dont penetrate well cant exploit light loadings least real world conditions could fly inside building really still air lighter wing loading Monobooms 415 oz per sq ft could used winds over 12 mph would wish airplane heavier smaller either would increase wing loading improve penetration Mono aspect ratio AR seven to-one about best can given area speed envelope exists aerodynamically speaking narrow range optimum AR out optimum real quick because its small wing section loses effi ciency rapidly decreasing chord width higher AR wing area will produce airplane slower top speed bigger turn radius poorer penetration So will much lower AR Streamlining important aerodymanic device vital rol Line modeL Keeping simple weve done well could airfoil planform veryslippery Getting control linkage inside engine mounted flush its bearers tight stream lined nacelle helped dramatically still much can done engine cowling spinner lead-out connections inside wing hollow streamlined rudder enclose stabilator horn benefit overall perfor mance of things would significant also require substantial fabrication effort Iz 58 Model Aviation FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 bIUFIU BOOM I& I/I6 PLYWOOD BELICRANK MOUNT BLADDER TOP VIEWcDWARTNENT INBOARD LE SHEETINACAP JTRIPS B TOP CENTER 3/16 SO BALSA L ESHEETING OMITTED FORI/32VERT LEAD OUT GUIDEB LB SOFTCLARITYGRAB WEB 3/WnjnernItrn I/B 3A6 BALSA24 5OVSRALL LG SPARS ALB SOFT-----GIG V2A 2IOVERALL LGTH 005 AL HINGE____________ ________________ TRIM TAB DO MOT DELETE 1/ 01B MILTISTBAND/L.A LEAD-OUT LINESDUBAO BALL UNK V52 BASSWOOD DOBEERS V32 BALSA OR OPTIONAL STREAMLAFO RUDDER INO NEWEl VERY FAST .COX TD 045 -GEE TEXT FOR REWORKING ENGINE 2 LAABNATIO@B OF Ar BALSA TRIM LEFT BEE FOR CONTROL CABLE DENIER GECTION NEETING 1A6 I/4BBLSA CAPAYRFA VTAIL BOOM RUDDER DETAIL 202 FIBERGLASS PATTEAPI 7r7k LEKMID TRUNG-/ EDGE NACELLE 5 LA SOFT BALSA MILL OUT FOR MOUNTING ENABlE 35 S MAPLE MOTOR MOLBYS czz SILGR!EAN-VW BALSA 5 LB SOFT 10 REWIRED VB SOFT BALSA 2 REOD 1A6 BALSA SHEETING LB SOFT A-GRAB7 -4-Ziil7 _ El IjIB CAPSTBIPS ViA BALSA SOFT CENTER SECTION SHEETINGTOP BOTTOM IllII/ IIV32 VERY DENI4 WEB FROM CAPSYRIP YE SUPPORTS MATERIAL WING TlP WEIGI4T N\IIGRAM YE VRA BALSA B BOY YE GREETING lAB BALSAI2 CE / GLASS CLOTh MID LB ISOFTI C-GRAINHOT STIFF lOP ARE BOTIOM GOLDBERG FLEX POINT HINGE TRAINFD TO GAB WIOTH LINK\ PLYWOOD Hl OUBRO RUBSTIFF S 3ILNI*4 030 CAINE ASSENRY 2 CE GLASS cAmH HOT STIFF TOP MID BOTTOM STABILATOR RIMPUFD STARLATE MHGF GLASS B HOT STIFF TOP B BOTTOIA LONG PANEL OF STAB __ reOABO~ ILATOR — BACELLE2AMED BALSA FIlER CR-ABlEk-vBmqASS TImIG HORNTAP 2 56 MOLINTTAP OLT DRAd mcsEi I4OPELT ISA ALIAI ROD STARILATORnfWIp5n BY MOPPELE GROUP TEAM PLUIS 2AXLE—I counci moms se ISTAB CONTROL OEIMRCO Perhaps better have airplane fly never gets built Construction assembly sequence has worked best us Cut out wood parts champher TE sheeting Sub-assemblies order inclusion wing structure Bellcrankcut leads 21 24 long attach install ball link mount platform Cable attach socket Engine mount glue up cut lug reliefs drill install blind nuts Nacelleglue up fit engine blind nut clearance Wing tipsapply fiberglass properly broken-in tuned TO 049 develops enough power pull plane 82 mph fast say Author says time yours stiffeners Boomglue up drill finish andepoxy bushings Stabilatorshape add fiberglass Continued page 150 j-PlN---3/lesQ~jSQzj LIE ON BOARD IfRE/i sketch better words describing authots method bulidina wino September 1982 59 ON 019 DEPTh SAUGE/ / lAB C-GRAIN BALSA IGOFfl WING TIPS single-point lead-out guide formed crush ing5/32-in brasstubing feelergauge Pr cision fit groups tracks lead-outs minimum drag Litti things add up tlgnT ana streaminea naceiie improves airnow snrougn propeller disc increases props efficiency Good engine tips text determine prop size let us assume dyna mometer measurement has made super engine giving peak hp 5000 rpm n583 revs/sec Using hp multiply ing efficiency 81 enter Figure 2 1134 Drag Horsepower find speed 165 mph perfect pilot interesting note pilot can engine question lose system about 8 mph Finally Figure 7 note range values over d may vary limited J both speed V engine revs per second n now fixed spread shown Table 3 ComputedfromthedefinitionofCponFigure 7 shows diameter 488 ft 586 UsingJ 85 Cp06 inFigure7 sets Wd ratio 092 Note propeller diameterd applies two-bladed prop translate one-blader multiply d constant 115 results one-blade diameter of67 inches p/d ratio unchanged 092 giving pitch 61 inches dimensions one-bladers used 1981 team trials 65-in diameter 6-in pitch speed turned 165 mph better conversion multiplier going twoblade one-blade might 112 terms present practice detailed design pro cedure giving information chord distribu tion pitch distribution available Refer ence 7 References I Analytic Experimental Tools useful Select ing Developing Power Model Propellers D Monson NFFS Symposium 1980 2 Drag Control Lines Models H Jex et aL 195 1-52 Model Aeronautic Yearbook 3 BookFluid Dynamic Drag S Hoemer Inter ference Drag Two Circular Cylinders 4 BookMechanics Seely EnsignThe Conical Pendulum 5 Choosing Best Wakefield Propeller Meuser NFFS Sympo 1970 6 Propellers made Painless D Mendel NFFS Sympo 1970 7 Analytic Design Propellers having Minimum Induced Loss E Larrabee NFFS Sympo 1977 hope time readers column make attempt fly FAI Speed will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed Column Once again thanks Charlie Lieber wil lingness share much information us Gene Hempe 301 North Yale Dr Garlan4 TX 75042 Monoboom A/Hoffelt Continued page 59 stiffeners finish assemble boom Assembly Mark cut lead-out holes inboard ribs Pin bottom spar work board Lay ribs Make full-span jig proper height position bottom trailing edge jig -in behind ribs Square pin ribs trailing edge Work top spar square ribs space center engine mount Use cyano acrylate glue CA joints Cut nose off rib behind bladder compart ment Glue leading edge Pull pins bottom trailing edge Glue top trailing edge 30-mi epoxy Pin two inches Glue top leading edge sheet 30-mi epoxy Pin inch good trick pin through full-span strip 3/16 sq TE LE sparthis will hold 1/16 sheet Great Planes. Two favorite R/C classics Ask name Either way cant go wrong because both truly Great Planes Trainer 60TM daddy line favorite R/C modelers big 60 wingspan better stability plus plenty room installing radios y great looking design builds up fast can spend time air bench Precision machine cut sanded parts tricycle gear good ground handling. great looking design thats bound draw attention . performance proves beauty can skin deep use 40 engine youll have nice manageable beginning trainer Less $7795 KaosTM No wonder Kaos worlds popular choices comes time graduate low wing design build maintain kind aerobatic performance steals show time thanks famous Kaos tapered wing design. Made precision machine cut sanded parts fast easy assembly Less $7795 Thirty-four Great P Trainer 5 Trainer 10 Basic Trainer Trainer 20 Trainer 40 GLA 40 Trainer 60 Big Birdy Soar Birdy Tweedy Bird Dirty Birdy 40 Dirty Birdy 60 Super Sportster 40 Sun Hi 420 Quickest 200 Quickest 500 553j Kaos Super Kaos 40 Super ltaos 60 JEO Deception Cosmic Wind Rearwin Speedster Chipmunk Corbin Ace Kraft Super Ft CAP 20L AT-6 Texan P51 Mustang F7 Tigercat T28 Aerocommander Shnke Lockheed Sirius 150 Model Aviation shown installed 1Jreat Planes popular rainer bO key summer R/C fun Plus. two great new accessories Great Planes Switch n GIQwTM Now can forget about engine flameouts during low throttle maneuvers turning last winters work love pile spare parts U Switch n GlowiM Great Planes new on-board ignition system links throttle servo Pull throttle back lightweight battery pack puts glow back glow plug throttle setting desire As soon throttle up Switch n Glow cuts outE Its easy install lightweight affordable Great scale builders dont want cut holes engine cowlings starting Also ideal competition pattern flyers cant afford flame-out wrong time mention boaters last time flameout middle lake Dont take chances favorite R/C project Buy Switch n GlowiM Its insurance cant af ford Less $2495 complete SportFloats er go out lake can fish swim. can go seaplaning Great Planes new SportFloats 31 foam core floats handle large 60 size designs floats build up fast easy Just install landing gear blocks foam cores cover balsa ply sheeting included finish off favorite lake river new R/C thrills youre bound enjoy thanks SportFloats Less $2895 QAWINGcEP MO favorite R/C dealer PO BOX 721 URBANA ILLINOIS 61801 217/367-2069 place like vise will keep straight Add spar webbing trailing edge supports cap strips Flip wing upside down re-pin Trim leading edge bladder compartment add spar web area Glue cut-off rib web bladder area leading edge sheeting goes epoxy dry check loose joints Install bellcrank assembly Notch wing cable outlet Drill through rib install cable Glue center sheeting Sand wing Cut away sheeting install engine mount Mask blind nuts glue nacelle epoxy Fiberglass front end pattern shown plans Cut bladder access Finish wing tips lead-out guide Add tip weight Cover wing Fit booni Cut cable housing epoxy cured solder connector Add fuel pinch off Use contact cement trim tab rudder Engine Now plane finished grab TD 049 .. wait minute want Mono ly smoke TD will probably need little tuning great deal myth floating around regarding extraction horsepower engines spent few weekends test stand sorting through possibilities Right off take new motor apart wash out metal bits Throw needle valve assembly trash go buy fine-thread replacement unit made Kustom Kraftsman ship Ace RC youre shopping get half doxen GloBee competition glow heads connecting rod reset tooL connecting rod retaining socket piston weakest link engine socket will pound itself sloppy during break-in will have reset Several reset tools available dealer prefer unit made Davis Diesel Develop ment includes jig prevent piston distortion Drill venturi 125 carefully reassemble engine two gaskets under glow head seems three pertinent factors lA engine performance fuel compression state engines break-in factors closely interrelated change necessitates adjustment others obain optimum power First no such thing fuel too hot TD 049 snot traditional ingredi ents open exhaust configuration anyway little engines have very high surfacearea-to-displacement ratio al ways run too cold practical minimum horsepower search 40% nitro Best tested 75% nitro 10% propylene oxide 15% Klotz generally six eight hundred rpm faster 40% 22000 range hottest fuels cylinder head temperature didnt go over 390 degrees best power setting below what needed best thermal efficiency indi cates could use hotter fuel rye told current Klotz oil has substantial castor content dont know behaved though did lubricating well buming leanish settings have read TD instruction sheet might think couple rich runs ground will have new 049 Combat engine ready will always use 10% nitro exploit high-nitro fuels make horsepower protracted break-in necessary TD piston grows heat-cycled running cooling Higher temperature ranges September 1982 151 PrnG1 TUNGSTEN CARBIDE Mans Hardest Material next Diamond LIFETIME SANDING TOOLS 4 -tF - RADIUS TOOL 2 TOOLS IN ONE MONEY BACK 7 GUARANTEE 3/4 Radius TOOL Ohio add 6% sales tax $695 pp Check Money Order No GODS Wholesale & Dealer Inquiries Invited D G PRODUCTS CO 209 CARRIANDS DR DAYTON OHIO 45429 high nitro fuels make grow still What needed enough running stabilize swell ing pistonand wear proper fit its cylinder process cant rushed lots intro lean settings applied too soon piston will galland show dull scratched surface actually swollen piston pressing hard against cylinder wall metal rubbed torn off galls badly will distort surfaces piston cylinder engine will never make much power Start medium-nitro fuel two gaskets under glow head Use prop cut diameter sufficiently allow approximately 18000 rpm engine just breaking two-cycle Run engine about three minutes time checking piston galling between runs starts gall richen setting run way until piston appears polished Tight en gines can have break-in hastened apply ing Fox Lustrox polishing abrasive piston between runs Dont run Lustrox through putting venturi Just mix little fuel dab exhaust port between runs engine will hold peak power setting three minutes sagging galling piston change high-nitro fuel will using fly Remove two head gaskets hot fuel 40% nitro less Go through break-in running sequence until full power setting can held three minutes trauma Now have elusive pistomcylinder fit sought after lA enthus iasts best performance compression must set particular fuel mix done adding removing gaskets under glow head greater fuels nitro content lower compression must washers GloBee Racing glow head better comes engine consistently tests 200 faster stock has mechan ically superior clamping arrangement less costly final compression setting best done test stand will need good tachometer will discern changes 50 rpm Take readings range head settings will see pattern Allow engine stabilize come up temperature reading Gen erally speaking GloBee head tight rod gasket good 40% two 75% engines differ lotyours might odd will pay test Okay TD ready bolt Mono ViA best performing prop have found Windsor Master Airscrew 5A x 4 Use 012 35-ft multi-strand lines may Force US FF Champs/Meuser Continued page 65 regular Mulvihill eventmodels built tuned survive rigors thermal flying few modelers build especially-light models trim still-air conditions modelers Bob White won event its first four runnings Consequently eyes him launched familiar twinfin modeL climbed flawlessly two minutes altitude perhaps 500 ft before beginning its majestic circling glide landing 10 mm 49 sec later within 50 yards launch ing point giving White fifth consecutive win possession Oakland Cloud Dusters Perpetual Trophy yet another year Inasmuch 152 Model Aviation
Edition: Model Aviation - 1982/09
Page Numbers: 58, 59, 150, 151, 152
WE WERE contest watching Combat airplanes just falling out sky dont mean hitting other werent capable flyingat least flying turning same time could better thought Sure would easy Wed design exercise see just what improved performance could con veniently little planes Three years have passed since getting at fly better hasnt come easily some difficulties solve CL ls beset problems because low Reynolds Number regime operate Everything works against props small inefficient Line airframe drag large relative thrust Worst wing sections airfoils compromised low maidmum lift coefficients poor lift/drag ratios compounded power deficien cies Cox TD 049 neat engine compared 15 35 cu Combat engines has poor power-to-weight ratio less power per cubic inch thing to give engine comprehensive hop-up Everything counts small increment im proved efficiency area will added together give us substantial performance crease basic design parameters Monoboom borrowed larger Monoboom FAI AMA airframes design charac teristics give spectacular results ap plied rame its inherently poorer efficiencies concept involves high aspect ratio wing compactness practical stream lining Area asymmetry planform trim alignment optimized absorb minimum power airplane turning hard suitable airfoil selected help out Wing loading aspect ratio main determinants turn radius airplane can achieve Mono does spectacularly fast stall free four-foot-diameter loops lighter loading would allow still tighter turns intro duce penetration stability problems gnsty turbulent air conditions models can built really light have much relative drag dont penetrate well cant exploit light loadings least real world conditions could fly inside building really still air lighter wing loading Monobooms 415 oz per sq ft could used winds over 12 mph would wish airplane heavier smaller either would increase wing loading improve penetration Mono aspect ratio AR seven to-one about best can given area speed envelope exists aerodynamically speaking narrow range optimum AR out optimum real quick because its small wing section loses effi ciency rapidly decreasing chord width higher AR wing area will produce airplane slower top speed bigger turn radius poorer penetration So will much lower AR Streamlining important aerodymanic device vital rol Line modeL Keeping simple weve done well could airfoil planform veryslippery Getting control linkage inside engine mounted flush its bearers tight stream lined nacelle helped dramatically still much can done engine cowling spinner lead-out connections inside wing hollow streamlined rudder enclose stabilator horn benefit overall perfor mance of things would significant also require substantial fabrication effort Iz 58 Model Aviation FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 bIUFIU BOOM I& I/I6 PLYWOOD BELICRANK MOUNT BLADDER TOP VIEWcDWARTNENT INBOARD LE SHEETINACAP JTRIPS B TOP CENTER 3/16 SO BALSA L ESHEETING OMITTED FORI/32VERT LEAD OUT GUIDEB LB SOFTCLARITYGRAB WEB 3/WnjnernItrn I/B 3A6 BALSA24 5OVSRALL LG SPARS ALB SOFT-----GIG V2A 2IOVERALL LGTH 005 AL HINGE____________ ________________ TRIM TAB DO MOT DELETE 1/ 01B MILTISTBAND/L.A LEAD-OUT LINESDUBAO BALL UNK V52 BASSWOOD DOBEERS V32 BALSA OR OPTIONAL STREAMLAFO RUDDER INO NEWEl VERY FAST .COX TD 045 -GEE TEXT FOR REWORKING ENGINE 2 LAABNATIO@B OF Ar BALSA TRIM LEFT BEE FOR CONTROL CABLE DENIER GECTION NEETING 1A6 I/4BBLSA CAPAYRFA VTAIL BOOM RUDDER DETAIL 202 FIBERGLASS PATTEAPI 7r7k LEKMID TRUNG-/ EDGE NACELLE 5 LA SOFT BALSA MILL OUT FOR MOUNTING ENABlE 35 S MAPLE MOTOR MOLBYS czz SILGR!EAN-VW BALSA 5 LB SOFT 10 REWIRED VB SOFT BALSA 2 REOD 1A6 BALSA SHEETING LB SOFT A-GRAB7 -4-Ziil7 _ El IjIB CAPSTBIPS ViA BALSA SOFT CENTER SECTION SHEETINGTOP BOTTOM IllII/ IIV32 VERY DENI4 WEB FROM CAPSYRIP YE SUPPORTS MATERIAL WING TlP WEIGI4T N\IIGRAM YE VRA BALSA B BOY YE GREETING lAB BALSAI2 CE / GLASS CLOTh MID LB ISOFTI C-GRAINHOT STIFF lOP ARE BOTIOM GOLDBERG FLEX POINT HINGE TRAINFD TO GAB WIOTH LINK\ PLYWOOD Hl OUBRO RUBSTIFF S 3ILNI*4 030 CAINE ASSENRY 2 CE GLASS cAmH HOT STIFF TOP MID BOTTOM STABILATOR RIMPUFD STARLATE MHGF GLASS B HOT STIFF TOP B BOTTOIA LONG PANEL OF STAB __ reOABO~ ILATOR — BACELLE2AMED BALSA FIlER CR-ABlEk-vBmqASS TImIG HORNTAP 2 56 MOLINTTAP OLT DRAd mcsEi I4OPELT ISA ALIAI ROD STARILATORnfWIp5n BY MOPPELE GROUP TEAM PLUIS 2AXLE—I counci moms se ISTAB CONTROL OEIMRCO Perhaps better have airplane fly never gets built Construction assembly sequence has worked best us Cut out wood parts champher TE sheeting Sub-assemblies order inclusion wing structure Bellcrankcut leads 21 24 long attach install ball link mount platform Cable attach socket Engine mount glue up cut lug reliefs drill install blind nuts Nacelleglue up fit engine blind nut clearance Wing tipsapply fiberglass properly broken-in tuned TO 049 develops enough power pull plane 82 mph fast say Author says time yours stiffeners Boomglue up drill finish andepoxy bushings Stabilatorshape add fiberglass Continued page 150 j-PlN---3/lesQ~jSQzj LIE ON BOARD IfRE/i sketch better words describing authots method bulidina wino September 1982 59 ON 019 DEPTh SAUGE/ / lAB C-GRAIN BALSA IGOFfl WING TIPS single-point lead-out guide formed crush ing5/32-in brasstubing feelergauge Pr cision fit groups tracks lead-outs minimum drag Litti things add up tlgnT ana streaminea naceiie improves airnow snrougn propeller disc increases props efficiency Good engine tips text determine prop size let us assume dyna mometer measurement has made super engine giving peak hp 5000 rpm n583 revs/sec Using hp multiply ing efficiency 81 enter Figure 2 1134 Drag Horsepower find speed 165 mph perfect pilot interesting note pilot can engine question lose system about 8 mph Finally Figure 7 note range values over d may vary limited J both speed V engine revs per second n now fixed spread shown Table 3 ComputedfromthedefinitionofCponFigure 7 shows diameter 488 ft 586 UsingJ 85 Cp06 inFigure7 sets Wd ratio 092 Note propeller diameterd applies two-bladed prop translate one-blader multiply d constant 115 results one-blade diameter of67 inches p/d ratio unchanged 092 giving pitch 61 inches dimensions one-bladers used 1981 team trials 65-in diameter 6-in pitch speed turned 165 mph better conversion multiplier going twoblade one-blade might 112 terms present practice detailed design pro cedure giving information chord distribu tion pitch distribution available Refer ence 7 References I Analytic Experimental Tools useful Select ing Developing Power Model Propellers D Monson NFFS Symposium 1980 2 Drag Control Lines Models H Jex et aL 195 1-52 Model Aeronautic Yearbook 3 BookFluid Dynamic Drag S Hoemer Inter ference Drag Two Circular Cylinders 4 BookMechanics Seely EnsignThe Conical Pendulum 5 Choosing Best Wakefield Propeller Meuser NFFS Sympo 1970 6 Propellers made Painless D Mendel NFFS Sympo 1970 7 Analytic Design Propellers having Minimum Induced Loss E Larrabee NFFS Sympo 1977 hope time readers column make attempt fly FAI Speed will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed Column Once again thanks Charlie Lieber wil lingness share much information us Gene Hempe 301 North Yale Dr Garlan4 TX 75042 Monoboom A/Hoffelt Continued page 59 stiffeners finish assemble boom Assembly Mark cut lead-out holes inboard ribs Pin bottom spar work board Lay ribs Make full-span jig proper height position bottom trailing edge jig -in behind ribs Square pin ribs trailing edge Work top spar square ribs space center engine mount Use cyano acrylate glue CA joints Cut nose off rib behind bladder compart ment Glue leading edge Pull pins bottom trailing edge Glue top trailing edge 30-mi epoxy Pin two inches Glue top leading edge sheet 30-mi epoxy Pin inch good trick pin through full-span strip 3/16 sq TE LE sparthis will hold 1/16 sheet Great Planes. Two favorite R/C classics Ask name Either way cant go wrong because both truly Great Planes Trainer 60TM daddy line favorite R/C modelers big 60 wingspan better stability plus plenty room installing radios y great looking design builds up fast can spend time air bench Precision machine cut sanded parts tricycle gear good ground handling. great looking design thats bound draw attention . performance proves beauty can skin deep use 40 engine youll have nice manageable beginning trainer Less $7795 KaosTM No wonder Kaos worlds popular choices comes time graduate low wing design build maintain kind aerobatic performance steals show time thanks famous Kaos tapered wing design. Made precision machine cut sanded parts fast easy assembly Less $7795 Thirty-four Great P Trainer 5 Trainer 10 Basic Trainer Trainer 20 Trainer 40 GLA 40 Trainer 60 Big Birdy Soar Birdy Tweedy Bird Dirty Birdy 40 Dirty Birdy 60 Super Sportster 40 Sun Hi 420 Quickest 200 Quickest 500 553j Kaos Super Kaos 40 Super ltaos 60 JEO Deception Cosmic Wind Rearwin Speedster Chipmunk Corbin Ace Kraft Super Ft CAP 20L AT-6 Texan P51 Mustang F7 Tigercat T28 Aerocommander Shnke Lockheed Sirius 150 Model Aviation shown installed 1Jreat Planes popular rainer bO key summer R/C fun Plus. two great new accessories Great Planes Switch n GIQwTM Now can forget about engine flameouts during low throttle maneuvers turning last winters work love pile spare parts U Switch n GlowiM Great Planes new on-board ignition system links throttle servo Pull throttle back lightweight battery pack puts glow back glow plug throttle setting desire As soon throttle up Switch n Glow cuts outE Its easy install lightweight affordable Great scale builders dont want cut holes engine cowlings starting Also ideal competition pattern flyers cant afford flame-out wrong time mention boaters last time flameout middle lake Dont take chances favorite R/C project Buy Switch n GlowiM Its insurance cant af ford Less $2495 complete SportFloats er go out lake can fish swim. can go seaplaning Great Planes new SportFloats 31 foam core floats handle large 60 size designs floats build up fast easy Just install landing gear blocks foam cores cover balsa ply sheeting included finish off favorite lake river new R/C thrills youre bound enjoy thanks SportFloats Less $2895 QAWINGcEP MO favorite R/C dealer PO BOX 721 URBANA ILLINOIS 61801 217/367-2069 place like vise will keep straight Add spar webbing trailing edge supports cap strips Flip wing upside down re-pin Trim leading edge bladder compartment add spar web area Glue cut-off rib web bladder area leading edge sheeting goes epoxy dry check loose joints Install bellcrank assembly Notch wing cable outlet Drill through rib install cable Glue center sheeting Sand wing Cut away sheeting install engine mount Mask blind nuts glue nacelle epoxy Fiberglass front end pattern shown plans Cut bladder access Finish wing tips lead-out guide Add tip weight Cover wing Fit booni Cut cable housing epoxy cured solder connector Add fuel pinch off Use contact cement trim tab rudder Engine Now plane finished grab TD 049 .. wait minute want Mono ly smoke TD will probably need little tuning great deal myth floating around regarding extraction horsepower engines spent few weekends test stand sorting through possibilities Right off take new motor apart wash out metal bits Throw needle valve assembly trash go buy fine-thread replacement unit made Kustom Kraftsman ship Ace RC youre shopping get half doxen GloBee competition glow heads connecting rod reset tooL connecting rod retaining socket piston weakest link engine socket will pound itself sloppy during break-in will have reset Several reset tools available dealer prefer unit made Davis Diesel Develop ment includes jig prevent piston distortion Drill venturi 125 carefully reassemble engine two gaskets under glow head seems three pertinent factors lA engine performance fuel compression state engines break-in factors closely interrelated change necessitates adjustment others obain optimum power First no such thing fuel too hot TD 049 snot traditional ingredi ents open exhaust configuration anyway little engines have very high surfacearea-to-displacement ratio al ways run too cold practical minimum horsepower search 40% nitro Best tested 75% nitro 10% propylene oxide 15% Klotz generally six eight hundred rpm faster 40% 22000 range hottest fuels cylinder head temperature didnt go over 390 degrees best power setting below what needed best thermal efficiency indi cates could use hotter fuel rye told current Klotz oil has substantial castor content dont know behaved though did lubricating well buming leanish settings have read TD instruction sheet might think couple rich runs ground will have new 049 Combat engine ready will always use 10% nitro exploit high-nitro fuels make horsepower protracted break-in necessary TD piston grows heat-cycled running cooling Higher temperature ranges September 1982 151 PrnG1 TUNGSTEN CARBIDE Mans Hardest Material next Diamond LIFETIME SANDING TOOLS 4 -tF - RADIUS TOOL 2 TOOLS IN ONE MONEY BACK 7 GUARANTEE 3/4 Radius TOOL Ohio add 6% sales tax $695 pp Check Money Order No GODS Wholesale & Dealer Inquiries Invited D G PRODUCTS CO 209 CARRIANDS DR DAYTON OHIO 45429 high nitro fuels make grow still What needed enough running stabilize swell ing pistonand wear proper fit its cylinder process cant rushed lots intro lean settings applied too soon piston will galland show dull scratched surface actually swollen piston pressing hard against cylinder wall metal rubbed torn off galls badly will distort surfaces piston cylinder engine will never make much power Start medium-nitro fuel two gaskets under glow head Use prop cut diameter sufficiently allow approximately 18000 rpm engine just breaking two-cycle Run engine about three minutes time checking piston galling between runs starts gall richen setting run way until piston appears polished Tight en gines can have break-in hastened apply ing Fox Lustrox polishing abrasive piston between runs Dont run Lustrox through putting venturi Just mix little fuel dab exhaust port between runs engine will hold peak power setting three minutes sagging galling piston change high-nitro fuel will using fly Remove two head gaskets hot fuel 40% nitro less Go through break-in running sequence until full power setting can held three minutes trauma Now have elusive pistomcylinder fit sought after lA enthus iasts best performance compression must set particular fuel mix done adding removing gaskets under glow head greater fuels nitro content lower compression must washers GloBee Racing glow head better comes engine consistently tests 200 faster stock has mechan ically superior clamping arrangement less costly final compression setting best done test stand will need good tachometer will discern changes 50 rpm Take readings range head settings will see pattern Allow engine stabilize come up temperature reading Gen erally speaking GloBee head tight rod gasket good 40% two 75% engines differ lotyours might odd will pay test Okay TD ready bolt Mono ViA best performing prop have found Windsor Master Airscrew 5A x 4 Use 012 35-ft multi-strand lines may Force US FF Champs/Meuser Continued page 65 regular Mulvihill eventmodels built tuned survive rigors thermal flying few modelers build especially-light models trim still-air conditions modelers Bob White won event its first four runnings Consequently eyes him launched familiar twinfin modeL climbed flawlessly two minutes altitude perhaps 500 ft before beginning its majestic circling glide landing 10 mm 49 sec later within 50 yards launch ing point giving White fifth consecutive win possession Oakland Cloud Dusters Perpetual Trophy yet another year Inasmuch 152 Model Aviation
Edition: Model Aviation - 1982/09
Page Numbers: 58, 59, 150, 151, 152
WE WERE contest watching Combat airplanes just falling out sky dont mean hitting other werent capable flyingat least flying turning same time could better thought Sure would easy Wed design exercise see just what improved performance could con veniently little planes Three years have passed since getting at fly better hasnt come easily some difficulties solve CL ls beset problems because low Reynolds Number regime operate Everything works against props small inefficient Line airframe drag large relative thrust Worst wing sections airfoils compromised low maidmum lift coefficients poor lift/drag ratios compounded power deficien cies Cox TD 049 neat engine compared 15 35 cu Combat engines has poor power-to-weight ratio less power per cubic inch thing to give engine comprehensive hop-up Everything counts small increment im proved efficiency area will added together give us substantial performance crease basic design parameters Monoboom borrowed larger Monoboom FAI AMA airframes design charac teristics give spectacular results ap plied rame its inherently poorer efficiencies concept involves high aspect ratio wing compactness practical stream lining Area asymmetry planform trim alignment optimized absorb minimum power airplane turning hard suitable airfoil selected help out Wing loading aspect ratio main determinants turn radius airplane can achieve Mono does spectacularly fast stall free four-foot-diameter loops lighter loading would allow still tighter turns intro duce penetration stability problems gnsty turbulent air conditions models can built really light have much relative drag dont penetrate well cant exploit light loadings least real world conditions could fly inside building really still air lighter wing loading Monobooms 415 oz per sq ft could used winds over 12 mph would wish airplane heavier smaller either would increase wing loading improve penetration Mono aspect ratio AR seven to-one about best can given area speed envelope exists aerodynamically speaking narrow range optimum AR out optimum real quick because its small wing section loses effi ciency rapidly decreasing chord width higher AR wing area will produce airplane slower top speed bigger turn radius poorer penetration So will much lower AR Streamlining important aerodymanic device vital rol Line modeL Keeping simple weve done well could airfoil planform veryslippery Getting control linkage inside engine mounted flush its bearers tight stream lined nacelle helped dramatically still much can done engine cowling spinner lead-out connections inside wing hollow streamlined rudder enclose stabilator horn benefit overall perfor mance of things would significant also require substantial fabrication effort Iz 58 Model Aviation FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 bIUFIU BOOM I& I/I6 PLYWOOD BELICRANK MOUNT BLADDER TOP VIEWcDWARTNENT INBOARD LE SHEETINACAP JTRIPS B TOP CENTER 3/16 SO BALSA L ESHEETING OMITTED FORI/32VERT LEAD OUT GUIDEB LB SOFTCLARITYGRAB WEB 3/WnjnernItrn I/B 3A6 BALSA24 5OVSRALL LG SPARS ALB SOFT-----GIG V2A 2IOVERALL LGTH 005 AL HINGE____________ ________________ TRIM TAB DO MOT DELETE 1/ 01B MILTISTBAND/L.A LEAD-OUT LINESDUBAO BALL UNK V52 BASSWOOD DOBEERS V32 BALSA OR OPTIONAL STREAMLAFO RUDDER INO NEWEl VERY FAST .COX TD 045 -GEE TEXT FOR REWORKING ENGINE 2 LAABNATIO@B OF Ar BALSA TRIM LEFT BEE FOR CONTROL CABLE DENIER GECTION NEETING 1A6 I/4BBLSA CAPAYRFA VTAIL BOOM RUDDER DETAIL 202 FIBERGLASS PATTEAPI 7r7k LEKMID TRUNG-/ EDGE NACELLE 5 LA SOFT BALSA MILL OUT FOR MOUNTING ENABlE 35 S MAPLE MOTOR MOLBYS czz SILGR!EAN-VW BALSA 5 LB SOFT 10 REWIRED VB SOFT BALSA 2 REOD 1A6 BALSA SHEETING LB SOFT A-GRAB7 -4-Ziil7 _ El IjIB CAPSTBIPS ViA BALSA SOFT CENTER SECTION SHEETINGTOP BOTTOM IllII/ IIV32 VERY DENI4 WEB FROM CAPSYRIP YE SUPPORTS MATERIAL WING TlP WEIGI4T N\IIGRAM YE VRA BALSA B BOY YE GREETING lAB BALSAI2 CE / GLASS CLOTh MID LB ISOFTI C-GRAINHOT STIFF lOP ARE BOTIOM GOLDBERG FLEX POINT HINGE TRAINFD TO GAB WIOTH LINK\ PLYWOOD Hl OUBRO RUBSTIFF S 3ILNI*4 030 CAINE ASSENRY 2 CE GLASS cAmH HOT STIFF TOP MID BOTTOM STABILATOR RIMPUFD STARLATE MHGF GLASS B HOT STIFF TOP B BOTTOIA LONG PANEL OF STAB __ reOABO~ ILATOR — BACELLE2AMED BALSA FIlER CR-ABlEk-vBmqASS TImIG HORNTAP 2 56 MOLINTTAP OLT DRAd mcsEi I4OPELT ISA ALIAI ROD STARILATORnfWIp5n BY MOPPELE GROUP TEAM PLUIS 2AXLE—I counci moms se ISTAB CONTROL OEIMRCO Perhaps better have airplane fly never gets built Construction assembly sequence has worked best us Cut out wood parts champher TE sheeting Sub-assemblies order inclusion wing structure Bellcrankcut leads 21 24 long attach install ball link mount platform Cable attach socket Engine mount glue up cut lug reliefs drill install blind nuts Nacelleglue up fit engine blind nut clearance Wing tipsapply fiberglass properly broken-in tuned TO 049 develops enough power pull plane 82 mph fast say Author says time yours stiffeners Boomglue up drill finish andepoxy bushings Stabilatorshape add fiberglass Continued page 150 j-PlN---3/lesQ~jSQzj LIE ON BOARD IfRE/i sketch better words describing authots method bulidina wino September 1982 59 ON 019 DEPTh SAUGE/ / lAB C-GRAIN BALSA IGOFfl WING TIPS single-point lead-out guide formed crush ing5/32-in brasstubing feelergauge Pr cision fit groups tracks lead-outs minimum drag Litti things add up tlgnT ana streaminea naceiie improves airnow snrougn propeller disc increases props efficiency Good engine tips text determine prop size let us assume dyna mometer measurement has made super engine giving peak hp 5000 rpm n583 revs/sec Using hp multiply ing efficiency 81 enter Figure 2 1134 Drag Horsepower find speed 165 mph perfect pilot interesting note pilot can engine question lose system about 8 mph Finally Figure 7 note range values over d may vary limited J both speed V engine revs per second n now fixed spread shown Table 3 ComputedfromthedefinitionofCponFigure 7 shows diameter 488 ft 586 UsingJ 85 Cp06 inFigure7 sets Wd ratio 092 Note propeller diameterd applies two-bladed prop translate one-blader multiply d constant 115 results one-blade diameter of67 inches p/d ratio unchanged 092 giving pitch 61 inches dimensions one-bladers used 1981 team trials 65-in diameter 6-in pitch speed turned 165 mph better conversion multiplier going twoblade one-blade might 112 terms present practice detailed design pro cedure giving information chord distribu tion pitch distribution available Refer ence 7 References I Analytic Experimental Tools useful Select ing Developing Power Model Propellers D Monson NFFS Symposium 1980 2 Drag Control Lines Models H Jex et aL 195 1-52 Model Aeronautic Yearbook 3 BookFluid Dynamic Drag S Hoemer Inter ference Drag Two Circular Cylinders 4 BookMechanics Seely EnsignThe Conical Pendulum 5 Choosing Best Wakefield Propeller Meuser NFFS Sympo 1970 6 Propellers made Painless D Mendel NFFS Sympo 1970 7 Analytic Design Propellers having Minimum Induced Loss E Larrabee NFFS Sympo 1977 hope time readers column make attempt fly FAI Speed will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed Column Once again thanks Charlie Lieber wil lingness share much information us Gene Hempe 301 North Yale Dr Garlan4 TX 75042 Monoboom A/Hoffelt Continued page 59 stiffeners finish assemble boom Assembly Mark cut lead-out holes inboard ribs Pin bottom spar work board Lay ribs Make full-span jig proper height position bottom trailing edge jig -in behind ribs Square pin ribs trailing edge Work top spar square ribs space center engine mount Use cyano acrylate glue CA joints Cut nose off rib behind bladder compart ment Glue leading edge Pull pins bottom trailing edge Glue top trailing edge 30-mi epoxy Pin two inches Glue top leading edge sheet 30-mi epoxy Pin inch good trick pin through full-span strip 3/16 sq TE LE sparthis will hold 1/16 sheet Great Planes. Two favorite R/C classics Ask name Either way cant go wrong because both truly Great Planes Trainer 60TM daddy line favorite R/C modelers big 60 wingspan better stability plus plenty room installing radios y great looking design builds up fast can spend time air bench Precision machine cut sanded parts tricycle gear good ground handling. great looking design thats bound draw attention . performance proves beauty can skin deep use 40 engine youll have nice manageable beginning trainer Less $7795 KaosTM No wonder Kaos worlds popular choices comes time graduate low wing design build maintain kind aerobatic performance steals show time thanks famous Kaos tapered wing design. Made precision machine cut sanded parts fast easy assembly Less $7795 Thirty-four Great P Trainer 5 Trainer 10 Basic Trainer Trainer 20 Trainer 40 GLA 40 Trainer 60 Big Birdy Soar Birdy Tweedy Bird Dirty Birdy 40 Dirty Birdy 60 Super Sportster 40 Sun Hi 420 Quickest 200 Quickest 500 553j Kaos Super Kaos 40 Super ltaos 60 JEO Deception Cosmic Wind Rearwin Speedster Chipmunk Corbin Ace Kraft Super Ft CAP 20L AT-6 Texan P51 Mustang F7 Tigercat T28 Aerocommander Shnke Lockheed Sirius 150 Model Aviation shown installed 1Jreat Planes popular rainer bO key summer R/C fun Plus. two great new accessories Great Planes Switch n GIQwTM Now can forget about engine flameouts during low throttle maneuvers turning last winters work love pile spare parts U Switch n GlowiM Great Planes new on-board ignition system links throttle servo Pull throttle back lightweight battery pack puts glow back glow plug throttle setting desire As soon throttle up Switch n Glow cuts outE Its easy install lightweight affordable Great scale builders dont want cut holes engine cowlings starting Also ideal competition pattern flyers cant afford flame-out wrong time mention boaters last time flameout middle lake Dont take chances favorite R/C project Buy Switch n GlowiM Its insurance cant af ford Less $2495 complete SportFloats er go out lake can fish swim. can go seaplaning Great Planes new SportFloats 31 foam core floats handle large 60 size designs floats build up fast easy Just install landing gear blocks foam cores cover balsa ply sheeting included finish off favorite lake river new R/C thrills youre bound enjoy thanks SportFloats Less $2895 QAWINGcEP MO favorite R/C dealer PO BOX 721 URBANA ILLINOIS 61801 217/367-2069 place like vise will keep straight Add spar webbing trailing edge supports cap strips Flip wing upside down re-pin Trim leading edge bladder compartment add spar web area Glue cut-off rib web bladder area leading edge sheeting goes epoxy dry check loose joints Install bellcrank assembly Notch wing cable outlet Drill through rib install cable Glue center sheeting Sand wing Cut away sheeting install engine mount Mask blind nuts glue nacelle epoxy Fiberglass front end pattern shown plans Cut bladder access Finish wing tips lead-out guide Add tip weight Cover wing Fit booni Cut cable housing epoxy cured solder connector Add fuel pinch off Use contact cement trim tab rudder Engine Now plane finished grab TD 049 .. wait minute want Mono ly smoke TD will probably need little tuning great deal myth floating around regarding extraction horsepower engines spent few weekends test stand sorting through possibilities Right off take new motor apart wash out metal bits Throw needle valve assembly trash go buy fine-thread replacement unit made Kustom Kraftsman ship Ace RC youre shopping get half doxen GloBee competition glow heads connecting rod reset tooL connecting rod retaining socket piston weakest link engine socket will pound itself sloppy during break-in will have reset Several reset tools available dealer prefer unit made Davis Diesel Develop ment includes jig prevent piston distortion Drill venturi 125 carefully reassemble engine two gaskets under glow head seems three pertinent factors lA engine performance fuel compression state engines break-in factors closely interrelated change necessitates adjustment others obain optimum power First no such thing fuel too hot TD 049 snot traditional ingredi ents open exhaust configuration anyway little engines have very high surfacearea-to-displacement ratio al ways run too cold practical minimum horsepower search 40% nitro Best tested 75% nitro 10% propylene oxide 15% Klotz generally six eight hundred rpm faster 40% 22000 range hottest fuels cylinder head temperature didnt go over 390 degrees best power setting below what needed best thermal efficiency indi cates could use hotter fuel rye told current Klotz oil has substantial castor content dont know behaved though did lubricating well buming leanish settings have read TD instruction sheet might think couple rich runs ground will have new 049 Combat engine ready will always use 10% nitro exploit high-nitro fuels make horsepower protracted break-in necessary TD piston grows heat-cycled running cooling Higher temperature ranges September 1982 151 PrnG1 TUNGSTEN CARBIDE Mans Hardest Material next Diamond LIFETIME SANDING TOOLS 4 -tF - RADIUS TOOL 2 TOOLS IN ONE MONEY BACK 7 GUARANTEE 3/4 Radius TOOL Ohio add 6% sales tax $695 pp Check Money Order No GODS Wholesale & Dealer Inquiries Invited D G PRODUCTS CO 209 CARRIANDS DR DAYTON OHIO 45429 high nitro fuels make grow still What needed enough running stabilize swell ing pistonand wear proper fit its cylinder process cant rushed lots intro lean settings applied too soon piston will galland show dull scratched surface actually swollen piston pressing hard against cylinder wall metal rubbed torn off galls badly will distort surfaces piston cylinder engine will never make much power Start medium-nitro fuel two gaskets under glow head Use prop cut diameter sufficiently allow approximately 18000 rpm engine just breaking two-cycle Run engine about three minutes time checking piston galling between runs starts gall richen setting run way until piston appears polished Tight en gines can have break-in hastened apply ing Fox Lustrox polishing abrasive piston between runs Dont run Lustrox through putting venturi Just mix little fuel dab exhaust port between runs engine will hold peak power setting three minutes sagging galling piston change high-nitro fuel will using fly Remove two head gaskets hot fuel 40% nitro less Go through break-in running sequence until full power setting can held three minutes trauma Now have elusive pistomcylinder fit sought after lA enthus iasts best performance compression must set particular fuel mix done adding removing gaskets under glow head greater fuels nitro content lower compression must washers GloBee Racing glow head better comes engine consistently tests 200 faster stock has mechan ically superior clamping arrangement less costly final compression setting best done test stand will need good tachometer will discern changes 50 rpm Take readings range head settings will see pattern Allow engine stabilize come up temperature reading Gen erally speaking GloBee head tight rod gasket good 40% two 75% engines differ lotyours might odd will pay test Okay TD ready bolt Mono ViA best performing prop have found Windsor Master Airscrew 5A x 4 Use 012 35-ft multi-strand lines may Force US FF Champs/Meuser Continued page 65 regular Mulvihill eventmodels built tuned survive rigors thermal flying few modelers build especially-light models trim still-air conditions modelers Bob White won event its first four runnings Consequently eyes him launched familiar twinfin modeL climbed flawlessly two minutes altitude perhaps 500 ft before beginning its majestic circling glide landing 10 mm 49 sec later within 50 yards launch ing point giving White fifth consecutive win possession Oakland Cloud Dusters Perpetual Trophy yet another year Inasmuch 152 Model Aviation