QUICK neatest special events 1987 Nationals pit crew competition preparing starting engines clean start winning crew able start engine about 06 seconds thought about watched new flier field last Saturday having very little luck starting Supertigre G-21 Combat engine wore out battery patience fingers will take week recover Hed have thrilled get engine running six minutes mention 06 seconds Whether youre sport flier Combat aficio nado have two engine-starting methods guaranteed work little practice First dont flip engine forward unless its either really loose very hot Turn prop un til engine starting compression stroke hit prop backwards Youll hitting leading edge prop forcing down wards second way turn prop against com pression turn about quarter-turn clockwise will put blade roughly straight up down Now hit prop forward Using either method very little resis tance never actually turn engine past top-dead-center bouncing method causes engine momentarily run backwards engines will burn out excess prime running forward 06 seconds youre good enough Excess prime engine like G-2 1 ABC type bad news try flip ward theyre cold Editors note ABC refers type engine construction piston aluminum cylinder brass chrome-plaredRMcM takes healthy dose fuel exhaust port bounce method work right Try three four drops fuel placed directly port Turn engine through once see have good bump plug glowing brightly theres no bump try adding few drops fuel Youll know have put too much fuel because engine will run backwards sputter right amount what determine experimentation remember reprime engine sputters along burns out fuel guy field amazed see little effort needs ex pended start high-compression engine cold day times flipping forward way get engine going method can often aided small atomizer bottle filled 50/50 solution fuel Marvel Mystery Oil Remember bounce-off-compression method requires sharp hit flick propeller rather flip used through compression finger actually pushes piston 64 Model Aviation Control Line Combat Charlie Johnson 3716 Ingraham St San Diego CA 92109 Heres original external bladder tank setup Greg Hills Combat model later ver sion belicrank moved aft bladder could centered over CG crude setup flew well although maneuvers much better toward end flight s fuel depletion moved CG aft Massive amount fuel permitted very long flights Continued page 148 Charlies Rossi 15 AAC suddenly lost power Teardown inspection engine revealed some pretty fearful damage occurred Above aluminum piston some foreign matter couldnt make up bore together piston lost out Although total loss less severe seizures can smoothed out power restored Loose circlips glow plug elements bearing retainers small rocks can really job en gine L Below Piston crown shows chunks metal missing cratering no chance sealing Iron-piston engines can display signs crown caving discoloration excessive heat Aluminum pistons easier inspect because usualy have parts miss ing melted away R Below head insert reveals pitted metal large glob alu minum also left imprint piston crown broken glow plug element probably did damage since original plugs element missing engine torn down TWINS ARE CLASSIC AND AFFORDABLE Looking inexpensive opposed twin replace shaking smelly gas burner want scale like appearance smooth running 2 cycle glow operation Yes its back basics EHS Tradings Twin Star Comments .Have lot cognes rio doubt probsblij best. Bill Thomas Lake Havasu AZ .The Twin Star escsptonsly smooth engne displacement size. clae Lee ENGINE EDITOR RCM MAGAZINE answer question often asked- muffler muffler & header available CALL FOR INFORMAllON EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII 96720 1 -800-63HOBBV 808 935-9009 HAWAIISTD TIME 10 AM-7PM Mon-S 00 Without Muffler second contest will Paducah KY August 14 will include profile-models-only Scale event flown AMA event #509 Sport Scale rules Allen writes Sport Scale event sched uled St Louis contest will first CL Scale event flown area since 1981 second year Profile event Paducah full details contest site loca tions write Allen above address Direct Connection name newsletter new club called Knights Round Cir cle located Orange Los Angeles Coun ties CA area new club boasts some promi nent names CL circles Membership cludes Dale Kim Bart Klapinski John MeCol lum Dave Williams Jed Kusik Barry Bax ter Mike Keville clubs newsletter editor has asked tell about Day Contest held Sunday August 21 will include multiengined-profiles-only Scale event con test being run Jerrys Kids pro ceeds will go MDA prob lem newsletter item Mike sent did have location contest So please write Mike Keville 6618 Dashwood Street Lakewood CA 90713 full details worthwhile endeavor Please send correspondenceespecially pho tos relating CL Scaleto address shown very top column CL Combat/Johnson Continued page 64 about analyzing some typical engine problemsnot kind crank flies out front engine little nagging ones engine just doesnt run right Youll see pictures foreign matter right place can ruin engine pronto Broken glow plug elements notorious bat tering piston crowns cylinder head squish bands find combustion chamber pock marked like the picture should look other problems inside engine unless ye just made pit stop dirt pile crimped-type bearing retainers often come apart brass goes through engine theres lot slop rod wrist pin boss piston engine will lack power will eventually destroy itself Before tear engine down should sure yourself fuel system clean have fresh batch fuel bolts tight no air leaks structural joints engine mounted securely engine run ning poorly seems OK try new glow plug before tearing things apart Fuel containing lot trapped water will cause endless grief will bad glow plug feel things grinding around turn propeller over have look inside en gine Get habit analyzing what hap pened just crashed rock-hard ground engine vibrates next run may bent crankshaft loose mount model survived crash youre puzzled continuing problem look over part magnifying glass 8X loupe photo store Look cracks pistonand especially around intake port crankshaft Check crankpin scoring piston liner signs overheating season going Combat fliers dream Money Nats will history time read over Memorial Day weekend will terrific regional meet Eugene OR featuring Combat events well just about everything else contest held right airport convenience us fly meets will first Regionals new state-of-the-art flying site really sounds like theyve got fantastic site competition always super Check Calendar Sanctioned Events aka Contest Calendar information Also coming along will Bladder Grabber some incredible prizes AMA Nationals Texas Slow Combat Championships CL World Championships finally hold onto plug wrench $1000-first-prize Com bat meet AMA Sanction No 584 1AA Combat Internats triple-elimination Combat meet held Jasonville IN over Labor Day September 3-4 1988 weekend Sponsor CD meet Mr Energy himself Doe Passen Think about can get As overhead compartment airplane mea sured compartments couple 767s designers kindly made big enough biggest Fast Combat models course have careful someone doesnt toss 30-lb briefcase top Closet space good too beware some smaller airliners inch jam148 Model Aviation 40 CC/24 CU IN SAFE FLYING IS NO ACCIDENT 0 cf b 0 000 PLENTY OF FREE PARKING Yc C // IA \3/ FAIIIOROUNDS NI * VIMONIUM NO40 N BALTIMORE ~S MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 4 5 1988 Saturday- 9am 5pm Sunday- 10am 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored ThE RADK CONTROL MODELERS OF BALilMORE SWAP SHOP $10 FULL TABLE PER DAY $5 E PER DAY NO DEALERS PLEASE Pre-Registration CALL WAYNE MELLOR 301-788-3742 evenings FOR IrIFORMAflOlI COIflACF MARC DIRECTORS DAN YARCHIN & JOHN KIRK 912 Cromwell Bridge Road Towsori MD 21204 301655-0220 301825-8138 packed people bunch people using external controls fuel systems Id like point out few things have come up recently Obviously bladder tank breaks pits may blasted fuel remote chance fire drag external bladder doesnt seem hurt performance too much plane easier build stronger both bellcrank bladder vulnerable impact dam age Since fliers hook lines directly bellcrank much better chance lines being broken using much heavier lead-outs sure inspect line ends often youre used doing seem fray often some reason last column barely hit streets got call Al Kelly offering advice die sel engines Al finds easy work diesels also thinks nothing boring Out Picco 21 making 36 Just flick over says use soft stick whack prop like Racer Tim Gillott Hmmm said Al recommended mixture 35 %-40% ethyl ether 20% oilwhich can mixture cas tor oil mineral oil drugstore Youll also need 2%-3% amyl propyl nitrate rest kerosene ether amyl nitrate may raise eyebrows some folks lo cal chemical supply store because both have uses other model airplane fuels have trouble just show wonderful family-oriented magazine point out infor mation column Al did recommend Davis Diesel conversions sald ABC engines best Fox 36 MK IV would good bet big prop would aid starting beasts Ill bet would also really enhance perform ance Slow Combat model Bonus points Slow mufflers diesels found some real cheap dowels local su permarket work well reinforcing foam wings can put vertically between spars lock place pointed end skewer easily punches through foam just add little glue stuff back through wing cut off flush spar can done field repair after model has covered strengthen lead-out guide area can stick skewers through sip rib foam few inches keep tip flexing steering model important model has lot line rake spars way forward Drilling through engine mount block out 45 0 angle wing another way keep lot rigidity wing little sticks practically free weigh very little add lot strength Spar notches way too big spars Rather pour extra glue try shimming spar us ing medium-weight silkspan Cut piece silkspan about two inches wide youre using % x A-in spars length equal models wingspan Saturate tissue white glue squeegee off excess Put spar middle tissue press spar down foam cores overlapping paper onto foam does tighten up joint bonds spar foam much better Extra layers paper can used over spar add strength can also use small amounts fiberglass cloth things up center section really beef CL Navy Carrier/Perry Continued page 65 As usual will select winner correctly identify months Mystery Plane months winner receives years member ship Navy Carrier Society Nontraditional control systems Bill Boss CL Scale column has number articles about electric electronic control systems CL mo dels January issue provided particularly good summary well addresses inquiring about purchasing electronic control systems Such systems allow two lines provide control multiple functionsa definite advantage Scale models operating features would seem potential advantage Carrier flying well because reduced line drag two lines instead three Ive looked advantages gained using fewer three lines Carrier sim plicity Neither cost Threeline systems cheap easy simple proven available Two-line systems tend An electronic control system also has slight weight penalty model caused necessary bat tery pack decoder servo What advantage potential advantage comes increasing performance reducing line drag analysis performed relied number assumptions simplify process Most assumptions arent critical discussion Ill discuss engineer types curiousContinued page 1S2 June 1988 149
Edition: Model Aviation - 1988/06
Page Numbers: 64, 148, 149
QUICK neatest special events 1987 Nationals pit crew competition preparing starting engines clean start winning crew able start engine about 06 seconds thought about watched new flier field last Saturday having very little luck starting Supertigre G-21 Combat engine wore out battery patience fingers will take week recover Hed have thrilled get engine running six minutes mention 06 seconds Whether youre sport flier Combat aficio nado have two engine-starting methods guaranteed work little practice First dont flip engine forward unless its either really loose very hot Turn prop un til engine starting compression stroke hit prop backwards Youll hitting leading edge prop forcing down wards second way turn prop against com pression turn about quarter-turn clockwise will put blade roughly straight up down Now hit prop forward Using either method very little resis tance never actually turn engine past top-dead-center bouncing method causes engine momentarily run backwards engines will burn out excess prime running forward 06 seconds youre good enough Excess prime engine like G-2 1 ABC type bad news try flip ward theyre cold Editors note ABC refers type engine construction piston aluminum cylinder brass chrome-plaredRMcM takes healthy dose fuel exhaust port bounce method work right Try three four drops fuel placed directly port Turn engine through once see have good bump plug glowing brightly theres no bump try adding few drops fuel Youll know have put too much fuel because engine will run backwards sputter right amount what determine experimentation remember reprime engine sputters along burns out fuel guy field amazed see little effort needs ex pended start high-compression engine cold day times flipping forward way get engine going method can often aided small atomizer bottle filled 50/50 solution fuel Marvel Mystery Oil Remember bounce-off-compression method requires sharp hit flick propeller rather flip used through compression finger actually pushes piston 64 Model Aviation Control Line Combat Charlie Johnson 3716 Ingraham St San Diego CA 92109 Heres original external bladder tank setup Greg Hills Combat model later ver sion belicrank moved aft bladder could centered over CG crude setup flew well although maneuvers much better toward end flight s fuel depletion moved CG aft Massive amount fuel permitted very long flights Continued page 148 Charlies Rossi 15 AAC suddenly lost power Teardown inspection engine revealed some pretty fearful damage occurred Above aluminum piston some foreign matter couldnt make up bore together piston lost out Although total loss less severe seizures can smoothed out power restored Loose circlips glow plug elements bearing retainers small rocks can really job en gine L Below Piston crown shows chunks metal missing cratering no chance sealing Iron-piston engines can display signs crown caving discoloration excessive heat Aluminum pistons easier inspect because usualy have parts miss ing melted away R Below head insert reveals pitted metal large glob alu minum also left imprint piston crown broken glow plug element probably did damage since original plugs element missing engine torn down TWINS ARE CLASSIC AND AFFORDABLE Looking inexpensive opposed twin replace shaking smelly gas burner want scale like appearance smooth running 2 cycle glow operation Yes its back basics EHS Tradings Twin Star Comments .Have lot cognes rio doubt probsblij best. Bill Thomas Lake Havasu AZ .The Twin Star escsptonsly smooth engne displacement size. clae Lee ENGINE EDITOR RCM MAGAZINE answer question often asked- muffler muffler & header available CALL FOR INFORMAllON EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII 96720 1 -800-63HOBBV 808 935-9009 HAWAIISTD TIME 10 AM-7PM Mon-S 00 Without Muffler second contest will Paducah KY August 14 will include profile-models-only Scale event flown AMA event #509 Sport Scale rules Allen writes Sport Scale event sched uled St Louis contest will first CL Scale event flown area since 1981 second year Profile event Paducah full details contest site loca tions write Allen above address Direct Connection name newsletter new club called Knights Round Cir cle located Orange Los Angeles Coun ties CA area new club boasts some promi nent names CL circles Membership cludes Dale Kim Bart Klapinski John MeCol lum Dave Williams Jed Kusik Barry Bax ter Mike Keville clubs newsletter editor has asked tell about Day Contest held Sunday August 21 will include multiengined-profiles-only Scale event con test being run Jerrys Kids pro ceeds will go MDA prob lem newsletter item Mike sent did have location contest So please write Mike Keville 6618 Dashwood Street Lakewood CA 90713 full details worthwhile endeavor Please send correspondenceespecially pho tos relating CL Scaleto address shown very top column CL Combat/Johnson Continued page 64 about analyzing some typical engine problemsnot kind crank flies out front engine little nagging ones engine just doesnt run right Youll see pictures foreign matter right place can ruin engine pronto Broken glow plug elements notorious bat tering piston crowns cylinder head squish bands find combustion chamber pock marked like the picture should look other problems inside engine unless ye just made pit stop dirt pile crimped-type bearing retainers often come apart brass goes through engine theres lot slop rod wrist pin boss piston engine will lack power will eventually destroy itself Before tear engine down should sure yourself fuel system clean have fresh batch fuel bolts tight no air leaks structural joints engine mounted securely engine run ning poorly seems OK try new glow plug before tearing things apart Fuel containing lot trapped water will cause endless grief will bad glow plug feel things grinding around turn propeller over have look inside en gine Get habit analyzing what hap pened just crashed rock-hard ground engine vibrates next run may bent crankshaft loose mount model survived crash youre puzzled continuing problem look over part magnifying glass 8X loupe photo store Look cracks pistonand especially around intake port crankshaft Check crankpin scoring piston liner signs overheating season going Combat fliers dream Money Nats will history time read over Memorial Day weekend will terrific regional meet Eugene OR featuring Combat events well just about everything else contest held right airport convenience us fly meets will first Regionals new state-of-the-art flying site really sounds like theyve got fantastic site competition always super Check Calendar Sanctioned Events aka Contest Calendar information Also coming along will Bladder Grabber some incredible prizes AMA Nationals Texas Slow Combat Championships CL World Championships finally hold onto plug wrench $1000-first-prize Com bat meet AMA Sanction No 584 1AA Combat Internats triple-elimination Combat meet held Jasonville IN over Labor Day September 3-4 1988 weekend Sponsor CD meet Mr Energy himself Doe Passen Think about can get As overhead compartment airplane mea sured compartments couple 767s designers kindly made big enough biggest Fast Combat models course have careful someone doesnt toss 30-lb briefcase top Closet space good too beware some smaller airliners inch jam148 Model Aviation 40 CC/24 CU IN SAFE FLYING IS NO ACCIDENT 0 cf b 0 000 PLENTY OF FREE PARKING Yc C // IA \3/ FAIIIOROUNDS NI * VIMONIUM NO40 N BALTIMORE ~S MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 4 5 1988 Saturday- 9am 5pm Sunday- 10am 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored ThE RADK CONTROL MODELERS OF BALilMORE SWAP SHOP $10 FULL TABLE PER DAY $5 E PER DAY NO DEALERS PLEASE Pre-Registration CALL WAYNE MELLOR 301-788-3742 evenings FOR IrIFORMAflOlI COIflACF MARC DIRECTORS DAN YARCHIN & JOHN KIRK 912 Cromwell Bridge Road Towsori MD 21204 301655-0220 301825-8138 packed people bunch people using external controls fuel systems Id like point out few things have come up recently Obviously bladder tank breaks pits may blasted fuel remote chance fire drag external bladder doesnt seem hurt performance too much plane easier build stronger both bellcrank bladder vulnerable impact dam age Since fliers hook lines directly bellcrank much better chance lines being broken using much heavier lead-outs sure inspect line ends often youre used doing seem fray often some reason last column barely hit streets got call Al Kelly offering advice die sel engines Al finds easy work diesels also thinks nothing boring Out Picco 21 making 36 Just flick over says use soft stick whack prop like Racer Tim Gillott Hmmm said Al recommended mixture 35 %-40% ethyl ether 20% oilwhich can mixture cas tor oil mineral oil drugstore Youll also need 2%-3% amyl propyl nitrate rest kerosene ether amyl nitrate may raise eyebrows some folks lo cal chemical supply store because both have uses other model airplane fuels have trouble just show wonderful family-oriented magazine point out infor mation column Al did recommend Davis Diesel conversions sald ABC engines best Fox 36 MK IV would good bet big prop would aid starting beasts Ill bet would also really enhance perform ance Slow Combat model Bonus points Slow mufflers diesels found some real cheap dowels local su permarket work well reinforcing foam wings can put vertically between spars lock place pointed end skewer easily punches through foam just add little glue stuff back through wing cut off flush spar can done field repair after model has covered strengthen lead-out guide area can stick skewers through sip rib foam few inches keep tip flexing steering model important model has lot line rake spars way forward Drilling through engine mount block out 45 0 angle wing another way keep lot rigidity wing little sticks practically free weigh very little add lot strength Spar notches way too big spars Rather pour extra glue try shimming spar us ing medium-weight silkspan Cut piece silkspan about two inches wide youre using % x A-in spars length equal models wingspan Saturate tissue white glue squeegee off excess Put spar middle tissue press spar down foam cores overlapping paper onto foam does tighten up joint bonds spar foam much better Extra layers paper can used over spar add strength can also use small amounts fiberglass cloth things up center section really beef CL Navy Carrier/Perry Continued page 65 As usual will select winner correctly identify months Mystery Plane months winner receives years member ship Navy Carrier Society Nontraditional control systems Bill Boss CL Scale column has number articles about electric electronic control systems CL mo dels January issue provided particularly good summary well addresses inquiring about purchasing electronic control systems Such systems allow two lines provide control multiple functionsa definite advantage Scale models operating features would seem potential advantage Carrier flying well because reduced line drag two lines instead three Ive looked advantages gained using fewer three lines Carrier sim plicity Neither cost Threeline systems cheap easy simple proven available Two-line systems tend An electronic control system also has slight weight penalty model caused necessary bat tery pack decoder servo What advantage potential advantage comes increasing performance reducing line drag analysis performed relied number assumptions simplify process Most assumptions arent critical discussion Ill discuss engineer types curiousContinued page 1S2 June 1988 149
Edition: Model Aviation - 1988/06
Page Numbers: 64, 148, 149
QUICK neatest special events 1987 Nationals pit crew competition preparing starting engines clean start winning crew able start engine about 06 seconds thought about watched new flier field last Saturday having very little luck starting Supertigre G-21 Combat engine wore out battery patience fingers will take week recover Hed have thrilled get engine running six minutes mention 06 seconds Whether youre sport flier Combat aficio nado have two engine-starting methods guaranteed work little practice First dont flip engine forward unless its either really loose very hot Turn prop un til engine starting compression stroke hit prop backwards Youll hitting leading edge prop forcing down wards second way turn prop against com pression turn about quarter-turn clockwise will put blade roughly straight up down Now hit prop forward Using either method very little resis tance never actually turn engine past top-dead-center bouncing method causes engine momentarily run backwards engines will burn out excess prime running forward 06 seconds youre good enough Excess prime engine like G-2 1 ABC type bad news try flip ward theyre cold Editors note ABC refers type engine construction piston aluminum cylinder brass chrome-plaredRMcM takes healthy dose fuel exhaust port bounce method work right Try three four drops fuel placed directly port Turn engine through once see have good bump plug glowing brightly theres no bump try adding few drops fuel Youll know have put too much fuel because engine will run backwards sputter right amount what determine experimentation remember reprime engine sputters along burns out fuel guy field amazed see little effort needs ex pended start high-compression engine cold day times flipping forward way get engine going method can often aided small atomizer bottle filled 50/50 solution fuel Marvel Mystery Oil Remember bounce-off-compression method requires sharp hit flick propeller rather flip used through compression finger actually pushes piston 64 Model Aviation Control Line Combat Charlie Johnson 3716 Ingraham St San Diego CA 92109 Heres original external bladder tank setup Greg Hills Combat model later ver sion belicrank moved aft bladder could centered over CG crude setup flew well although maneuvers much better toward end flight s fuel depletion moved CG aft Massive amount fuel permitted very long flights Continued page 148 Charlies Rossi 15 AAC suddenly lost power Teardown inspection engine revealed some pretty fearful damage occurred Above aluminum piston some foreign matter couldnt make up bore together piston lost out Although total loss less severe seizures can smoothed out power restored Loose circlips glow plug elements bearing retainers small rocks can really job en gine L Below Piston crown shows chunks metal missing cratering no chance sealing Iron-piston engines can display signs crown caving discoloration excessive heat Aluminum pistons easier inspect because usualy have parts miss ing melted away R Below head insert reveals pitted metal large glob alu minum also left imprint piston crown broken glow plug element probably did damage since original plugs element missing engine torn down TWINS ARE CLASSIC AND AFFORDABLE Looking inexpensive opposed twin replace shaking smelly gas burner want scale like appearance smooth running 2 cycle glow operation Yes its back basics EHS Tradings Twin Star Comments .Have lot cognes rio doubt probsblij best. Bill Thomas Lake Havasu AZ .The Twin Star escsptonsly smooth engne displacement size. clae Lee ENGINE EDITOR RCM MAGAZINE answer question often asked- muffler muffler & header available CALL FOR INFORMAllON EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII 96720 1 -800-63HOBBV 808 935-9009 HAWAIISTD TIME 10 AM-7PM Mon-S 00 Without Muffler second contest will Paducah KY August 14 will include profile-models-only Scale event flown AMA event #509 Sport Scale rules Allen writes Sport Scale event sched uled St Louis contest will first CL Scale event flown area since 1981 second year Profile event Paducah full details contest site loca tions write Allen above address Direct Connection name newsletter new club called Knights Round Cir cle located Orange Los Angeles Coun ties CA area new club boasts some promi nent names CL circles Membership cludes Dale Kim Bart Klapinski John MeCol lum Dave Williams Jed Kusik Barry Bax ter Mike Keville clubs newsletter editor has asked tell about Day Contest held Sunday August 21 will include multiengined-profiles-only Scale event con test being run Jerrys Kids pro ceeds will go MDA prob lem newsletter item Mike sent did have location contest So please write Mike Keville 6618 Dashwood Street Lakewood CA 90713 full details worthwhile endeavor Please send correspondenceespecially pho tos relating CL Scaleto address shown very top column CL Combat/Johnson Continued page 64 about analyzing some typical engine problemsnot kind crank flies out front engine little nagging ones engine just doesnt run right Youll see pictures foreign matter right place can ruin engine pronto Broken glow plug elements notorious bat tering piston crowns cylinder head squish bands find combustion chamber pock marked like the picture should look other problems inside engine unless ye just made pit stop dirt pile crimped-type bearing retainers often come apart brass goes through engine theres lot slop rod wrist pin boss piston engine will lack power will eventually destroy itself Before tear engine down should sure yourself fuel system clean have fresh batch fuel bolts tight no air leaks structural joints engine mounted securely engine run ning poorly seems OK try new glow plug before tearing things apart Fuel containing lot trapped water will cause endless grief will bad glow plug feel things grinding around turn propeller over have look inside en gine Get habit analyzing what hap pened just crashed rock-hard ground engine vibrates next run may bent crankshaft loose mount model survived crash youre puzzled continuing problem look over part magnifying glass 8X loupe photo store Look cracks pistonand especially around intake port crankshaft Check crankpin scoring piston liner signs overheating season going Combat fliers dream Money Nats will history time read over Memorial Day weekend will terrific regional meet Eugene OR featuring Combat events well just about everything else contest held right airport convenience us fly meets will first Regionals new state-of-the-art flying site really sounds like theyve got fantastic site competition always super Check Calendar Sanctioned Events aka Contest Calendar information Also coming along will Bladder Grabber some incredible prizes AMA Nationals Texas Slow Combat Championships CL World Championships finally hold onto plug wrench $1000-first-prize Com bat meet AMA Sanction No 584 1AA Combat Internats triple-elimination Combat meet held Jasonville IN over Labor Day September 3-4 1988 weekend Sponsor CD meet Mr Energy himself Doe Passen Think about can get As overhead compartment airplane mea sured compartments couple 767s designers kindly made big enough biggest Fast Combat models course have careful someone doesnt toss 30-lb briefcase top Closet space good too beware some smaller airliners inch jam148 Model Aviation 40 CC/24 CU IN SAFE FLYING IS NO ACCIDENT 0 cf b 0 000 PLENTY OF FREE PARKING Yc C // IA \3/ FAIIIOROUNDS NI * VIMONIUM NO40 N BALTIMORE ~S MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 4 5 1988 Saturday- 9am 5pm Sunday- 10am 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored ThE RADK CONTROL MODELERS OF BALilMORE SWAP SHOP $10 FULL TABLE PER DAY $5 E PER DAY NO DEALERS PLEASE Pre-Registration CALL WAYNE MELLOR 301-788-3742 evenings FOR IrIFORMAflOlI COIflACF MARC DIRECTORS DAN YARCHIN & JOHN KIRK 912 Cromwell Bridge Road Towsori MD 21204 301655-0220 301825-8138 packed people bunch people using external controls fuel systems Id like point out few things have come up recently Obviously bladder tank breaks pits may blasted fuel remote chance fire drag external bladder doesnt seem hurt performance too much plane easier build stronger both bellcrank bladder vulnerable impact dam age Since fliers hook lines directly bellcrank much better chance lines being broken using much heavier lead-outs sure inspect line ends often youre used doing seem fray often some reason last column barely hit streets got call Al Kelly offering advice die sel engines Al finds easy work diesels also thinks nothing boring Out Picco 21 making 36 Just flick over says use soft stick whack prop like Racer Tim Gillott Hmmm said Al recommended mixture 35 %-40% ethyl ether 20% oilwhich can mixture cas tor oil mineral oil drugstore Youll also need 2%-3% amyl propyl nitrate rest kerosene ether amyl nitrate may raise eyebrows some folks lo cal chemical supply store because both have uses other model airplane fuels have trouble just show wonderful family-oriented magazine point out infor mation column Al did recommend Davis Diesel conversions sald ABC engines best Fox 36 MK IV would good bet big prop would aid starting beasts Ill bet would also really enhance perform ance Slow Combat model Bonus points Slow mufflers diesels found some real cheap dowels local su permarket work well reinforcing foam wings can put vertically between spars lock place pointed end skewer easily punches through foam just add little glue stuff back through wing cut off flush spar can done field repair after model has covered strengthen lead-out guide area can stick skewers through sip rib foam few inches keep tip flexing steering model important model has lot line rake spars way forward Drilling through engine mount block out 45 0 angle wing another way keep lot rigidity wing little sticks practically free weigh very little add lot strength Spar notches way too big spars Rather pour extra glue try shimming spar us ing medium-weight silkspan Cut piece silkspan about two inches wide youre using % x A-in spars length equal models wingspan Saturate tissue white glue squeegee off excess Put spar middle tissue press spar down foam cores overlapping paper onto foam does tighten up joint bonds spar foam much better Extra layers paper can used over spar add strength can also use small amounts fiberglass cloth things up center section really beef CL Navy Carrier/Perry Continued page 65 As usual will select winner correctly identify months Mystery Plane months winner receives years member ship Navy Carrier Society Nontraditional control systems Bill Boss CL Scale column has number articles about electric electronic control systems CL mo dels January issue provided particularly good summary well addresses inquiring about purchasing electronic control systems Such systems allow two lines provide control multiple functionsa definite advantage Scale models operating features would seem potential advantage Carrier flying well because reduced line drag two lines instead three Ive looked advantages gained using fewer three lines Carrier sim plicity Neither cost Threeline systems cheap easy simple proven available Two-line systems tend An electronic control system also has slight weight penalty model caused necessary bat tery pack decoder servo What advantage potential advantage comes increasing performance reducing line drag analysis performed relied number assumptions simplify process Most assumptions arent critical discussion Ill discuss engineer types curiousContinued page 1S2 June 1988 149