Bob Beckman rPMu fflers accepted rt sport Butwhy IT WASNT long ago arguments against use mufflers heard throughout land Now flying sites getting scarcer noise pollution legislation looming more evidence hearing damage mufflers accepted have ugly scaleand scale-like aircraft neatly hidden muffler system neces sary solutions part sport sport pattern fliers usual muffler tuned pipe objectionable want build fly scale scale-like airplanes theyre like warts Grecian Urn Im referring now us Sunday Scale Fliers just allout competition scale buffs worst want have muffler hidden under cowl best exhaust system functional scale outlets Several mufflers available can fit best category some types sizes scale subjects chances mounting stock muffler latest dream ship results another wart solution custom-make muffler similar accompanying photographs have building custom mufflers cars planes several years Machine tools lathe milling machine etc help always necessary have made quite serviceable units using hand tools modelers have shops greatest problem has find ing ways hold parts together temperatures involved Muffler manufacturers use castings heli-arc welding join aluminum mani 20 Model Aviation AcroSport cowl removed Note support strap around expansion chamber screwed engine mount methods materials torch welding brazing exist author having much success favors combination fasteners high-temp epoxy onlything tnat snows outsloe AcroSports cowl two very scale-like furuLuIud ,ders scale orjust scale-like aircraft minimum requirement have muffler hidden under cowl Better exhaust system functional scale outlets REC2TS T FITDOlL AED TAF FOR lITRE EXHAUSTNOUNTIBI BOLTS 1/2 ALUN PLATE BIT UP INTERIOR PRF THESE ANILES TYIIGAL MANIFOLD DESTIN FOR INVERThD ENOINE 80 SCREW 6 PLACES 4 OR 6O ICB04 \O 0 fOREGO END GA 1/2OD DRILLGD OUT 7/16 FIGURE 030SGGOJ MOThS DIlL ISO PAP 32ff PRESSURE FT PTrNI SAC ADAPTER1/2 I2IASE IURINI OR 256 STSEWD CLEARANCE HLIS 2So ITRTfWf OTT TAPP2 RILES THIS JOINT CAN RE I EPOXIED OR SEALED WITH SILICONE RUBBER I3 LONG 6-60 OR 5-32 OUNTINI BOLTS MANITLD-THAMBER JIBT DETAIL RILE TUBE TO PIT GOOBER 3 URGE TUSNT ROUND TUBING DRILL 1/6 HrLES CLEAR OTTO ETTI SAW 0f FILE OR SAE SLIT PD -ALLOW FOB REED RADIUS CUT AWAY WITH ITAZOR RAW AND/OR FILE 13 CTREfTIS FLUSH WI ITD TOT GAL END CLOSURE SECTION THAI EXHAUST STAGE FIGURE 2 folds aluminum expansion chambers Neither method practical mod elers Methods materials torch welding brazing aluminum exist Ive never much luck solution has combination ofmechan ical fasteners high temperature epoxy approach muffler design far scientific far its successful 1 Based available aluminum tubing either round square determine size location largest expansion cham ber will fit available space 2 Design manifold connect engine exhaust stack expansion cham ber manifold should a Be easily attached re moved engine b Be permanently attached expansion chamber using small screws epoxy c Have exhaust path minimum cross-sectional area great greater total area exhaust ports engine cylinder 3 Add exhaust outlets expan sion chamber a Are scale size appearance exit cowl b Are permanently attached expansion chamber screws epoxy c Have total outlet area expansion chamber equal slight ly less total area exhaust ports engine cylinder 4 Add mechanical support ex pansion chamber engine mount firewall minimize strain manifold chamber joint Fig 1 exploded view muffler AcroSport lathe milling machine needed make unit Fig 2 essentially same muffler can built using tools modelers have available use square tubing Semco adapter avoids need machining operations yet end result two scale-like exhaust stacks sticking out bottom cowl identical Fig 1 drawings show mufflers designed use horizontally mounted engines same basic design can used upright inverted engine changing way manifold mates engine ex pansion chamber Almost unlimited varia tions possible including simulated line radial engine exhausts very least can get wart inside cowl Materials really hard find Hardware building supply stores usu ally cany aluminum tubing both round square sizes large enough make expansion chambers same source can supply rod tubing exhaust stacks Manifolds can made square tubing machine tools available solid aluminum thick scrap bin local machine shop will often provide everything need specific design various pieces will depend tools available As minimum youll need usual hand tools electric drill drill-press stand miniature lathe/milling machines modelers use will help lot ultimate completely equipped machine shop sophisticated tools mean difference appearance utility manifold must easily attached engine applying unusual stresses Most newer engines have built bosses can used mount homemade muffler Try avoid straps around engine might distort cylinder Seal joint silicone rubber making final assembly various pieces muffler held together machine screws epoxy Since epoxy will provide lot holding power screws small 0-80 practical screws hold things place epoxy cures no compli cated difficult jigging required real key whole thing Continued page 102 22 Model Aviation Small scale-like sport plane inverted 25 engine Air scoop aide cowl covers cornerof manifold Stacksexit open rearof cowl belowfuselage wing juncture Materials hard find Hardware building supply storescarry round squaretubing Minimum tools required arethe usual hand tools electric drill drilipress stand Hobbyists miniature lathe/milling machines help Unimat utopia Upside-down view inverted engine version muffler shows potential use upright engine Close off ends stacks add six smaller stacks out side V-12 exhaust system new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495
Edition: Model Aviation - 1979/07
Page Numbers: 20, 21, 22, 102
Bob Beckman rPMu fflers accepted rt sport Butwhy IT WASNT long ago arguments against use mufflers heard throughout land Now flying sites getting scarcer noise pollution legislation looming more evidence hearing damage mufflers accepted have ugly scaleand scale-like aircraft neatly hidden muffler system neces sary solutions part sport sport pattern fliers usual muffler tuned pipe objectionable want build fly scale scale-like airplanes theyre like warts Grecian Urn Im referring now us Sunday Scale Fliers just allout competition scale buffs worst want have muffler hidden under cowl best exhaust system functional scale outlets Several mufflers available can fit best category some types sizes scale subjects chances mounting stock muffler latest dream ship results another wart solution custom-make muffler similar accompanying photographs have building custom mufflers cars planes several years Machine tools lathe milling machine etc help always necessary have made quite serviceable units using hand tools modelers have shops greatest problem has find ing ways hold parts together temperatures involved Muffler manufacturers use castings heli-arc welding join aluminum mani 20 Model Aviation AcroSport cowl removed Note support strap around expansion chamber screwed engine mount methods materials torch welding brazing exist author having much success favors combination fasteners high-temp epoxy onlything tnat snows outsloe AcroSports cowl two very scale-like furuLuIud ,ders scale orjust scale-like aircraft minimum requirement have muffler hidden under cowl Better exhaust system functional scale outlets REC2TS T FITDOlL AED TAF FOR lITRE EXHAUSTNOUNTIBI BOLTS 1/2 ALUN PLATE BIT UP INTERIOR PRF THESE ANILES TYIIGAL MANIFOLD DESTIN FOR INVERThD ENOINE 80 SCREW 6 PLACES 4 OR 6O ICB04 \O 0 fOREGO END GA 1/2OD DRILLGD OUT 7/16 FIGURE 030SGGOJ MOThS DIlL ISO PAP 32ff PRESSURE FT PTrNI SAC ADAPTER1/2 I2IASE IURINI OR 256 STSEWD CLEARANCE HLIS 2So ITRTfWf OTT TAPP2 RILES THIS JOINT CAN RE I EPOXIED OR SEALED WITH SILICONE RUBBER I3 LONG 6-60 OR 5-32 OUNTINI BOLTS MANITLD-THAMBER JIBT DETAIL RILE TUBE TO PIT GOOBER 3 URGE TUSNT ROUND TUBING DRILL 1/6 HrLES CLEAR OTTO ETTI SAW 0f FILE OR SAE SLIT PD -ALLOW FOB REED RADIUS CUT AWAY WITH ITAZOR RAW AND/OR FILE 13 CTREfTIS FLUSH WI ITD TOT GAL END CLOSURE SECTION THAI EXHAUST STAGE FIGURE 2 folds aluminum expansion chambers Neither method practical mod elers Methods materials torch welding brazing aluminum exist Ive never much luck solution has combination ofmechan ical fasteners high temperature epoxy approach muffler design far scientific far its successful 1 Based available aluminum tubing either round square determine size location largest expansion cham ber will fit available space 2 Design manifold connect engine exhaust stack expansion cham ber manifold should a Be easily attached re moved engine b Be permanently attached expansion chamber using small screws epoxy c Have exhaust path minimum cross-sectional area great greater total area exhaust ports engine cylinder 3 Add exhaust outlets expan sion chamber a Are scale size appearance exit cowl b Are permanently attached expansion chamber screws epoxy c Have total outlet area expansion chamber equal slight ly less total area exhaust ports engine cylinder 4 Add mechanical support ex pansion chamber engine mount firewall minimize strain manifold chamber joint Fig 1 exploded view muffler AcroSport lathe milling machine needed make unit Fig 2 essentially same muffler can built using tools modelers have available use square tubing Semco adapter avoids need machining operations yet end result two scale-like exhaust stacks sticking out bottom cowl identical Fig 1 drawings show mufflers designed use horizontally mounted engines same basic design can used upright inverted engine changing way manifold mates engine ex pansion chamber Almost unlimited varia tions possible including simulated line radial engine exhausts very least can get wart inside cowl Materials really hard find Hardware building supply stores usu ally cany aluminum tubing both round square sizes large enough make expansion chambers same source can supply rod tubing exhaust stacks Manifolds can made square tubing machine tools available solid aluminum thick scrap bin local machine shop will often provide everything need specific design various pieces will depend tools available As minimum youll need usual hand tools electric drill drill-press stand miniature lathe/milling machines modelers use will help lot ultimate completely equipped machine shop sophisticated tools mean difference appearance utility manifold must easily attached engine applying unusual stresses Most newer engines have built bosses can used mount homemade muffler Try avoid straps around engine might distort cylinder Seal joint silicone rubber making final assembly various pieces muffler held together machine screws epoxy Since epoxy will provide lot holding power screws small 0-80 practical screws hold things place epoxy cures no compli cated difficult jigging required real key whole thing Continued page 102 22 Model Aviation Small scale-like sport plane inverted 25 engine Air scoop aide cowl covers cornerof manifold Stacksexit open rearof cowl belowfuselage wing juncture Materials hard find Hardware building supply storescarry round squaretubing Minimum tools required arethe usual hand tools electric drill drilipress stand Hobbyists miniature lathe/milling machines help Unimat utopia Upside-down view inverted engine version muffler shows potential use upright engine Close off ends stacks add six smaller stacks out side V-12 exhaust system new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495
Edition: Model Aviation - 1979/07
Page Numbers: 20, 21, 22, 102
Bob Beckman rPMu fflers accepted rt sport Butwhy IT WASNT long ago arguments against use mufflers heard throughout land Now flying sites getting scarcer noise pollution legislation looming more evidence hearing damage mufflers accepted have ugly scaleand scale-like aircraft neatly hidden muffler system neces sary solutions part sport sport pattern fliers usual muffler tuned pipe objectionable want build fly scale scale-like airplanes theyre like warts Grecian Urn Im referring now us Sunday Scale Fliers just allout competition scale buffs worst want have muffler hidden under cowl best exhaust system functional scale outlets Several mufflers available can fit best category some types sizes scale subjects chances mounting stock muffler latest dream ship results another wart solution custom-make muffler similar accompanying photographs have building custom mufflers cars planes several years Machine tools lathe milling machine etc help always necessary have made quite serviceable units using hand tools modelers have shops greatest problem has find ing ways hold parts together temperatures involved Muffler manufacturers use castings heli-arc welding join aluminum mani 20 Model Aviation AcroSport cowl removed Note support strap around expansion chamber screwed engine mount methods materials torch welding brazing exist author having much success favors combination fasteners high-temp epoxy onlything tnat snows outsloe AcroSports cowl two very scale-like furuLuIud ,ders scale orjust scale-like aircraft minimum requirement have muffler hidden under cowl Better exhaust system functional scale outlets REC2TS T FITDOlL AED TAF FOR lITRE EXHAUSTNOUNTIBI BOLTS 1/2 ALUN PLATE BIT UP INTERIOR PRF THESE ANILES TYIIGAL MANIFOLD DESTIN FOR INVERThD ENOINE 80 SCREW 6 PLACES 4 OR 6O ICB04 \O 0 fOREGO END GA 1/2OD DRILLGD OUT 7/16 FIGURE 030SGGOJ MOThS DIlL ISO PAP 32ff PRESSURE FT PTrNI SAC ADAPTER1/2 I2IASE IURINI OR 256 STSEWD CLEARANCE HLIS 2So ITRTfWf OTT TAPP2 RILES THIS JOINT CAN RE I EPOXIED OR SEALED WITH SILICONE RUBBER I3 LONG 6-60 OR 5-32 OUNTINI BOLTS MANITLD-THAMBER JIBT DETAIL RILE TUBE TO PIT GOOBER 3 URGE TUSNT ROUND TUBING DRILL 1/6 HrLES CLEAR OTTO ETTI SAW 0f FILE OR SAE SLIT PD -ALLOW FOB REED RADIUS CUT AWAY WITH ITAZOR RAW AND/OR FILE 13 CTREfTIS FLUSH WI ITD TOT GAL END CLOSURE SECTION THAI EXHAUST STAGE FIGURE 2 folds aluminum expansion chambers Neither method practical mod elers Methods materials torch welding brazing aluminum exist Ive never much luck solution has combination ofmechan ical fasteners high temperature epoxy approach muffler design far scientific far its successful 1 Based available aluminum tubing either round square determine size location largest expansion cham ber will fit available space 2 Design manifold connect engine exhaust stack expansion cham ber manifold should a Be easily attached re moved engine b Be permanently attached expansion chamber using small screws epoxy c Have exhaust path minimum cross-sectional area great greater total area exhaust ports engine cylinder 3 Add exhaust outlets expan sion chamber a Are scale size appearance exit cowl b Are permanently attached expansion chamber screws epoxy c Have total outlet area expansion chamber equal slight ly less total area exhaust ports engine cylinder 4 Add mechanical support ex pansion chamber engine mount firewall minimize strain manifold chamber joint Fig 1 exploded view muffler AcroSport lathe milling machine needed make unit Fig 2 essentially same muffler can built using tools modelers have available use square tubing Semco adapter avoids need machining operations yet end result two scale-like exhaust stacks sticking out bottom cowl identical Fig 1 drawings show mufflers designed use horizontally mounted engines same basic design can used upright inverted engine changing way manifold mates engine ex pansion chamber Almost unlimited varia tions possible including simulated line radial engine exhausts very least can get wart inside cowl Materials really hard find Hardware building supply stores usu ally cany aluminum tubing both round square sizes large enough make expansion chambers same source can supply rod tubing exhaust stacks Manifolds can made square tubing machine tools available solid aluminum thick scrap bin local machine shop will often provide everything need specific design various pieces will depend tools available As minimum youll need usual hand tools electric drill drill-press stand miniature lathe/milling machines modelers use will help lot ultimate completely equipped machine shop sophisticated tools mean difference appearance utility manifold must easily attached engine applying unusual stresses Most newer engines have built bosses can used mount homemade muffler Try avoid straps around engine might distort cylinder Seal joint silicone rubber making final assembly various pieces muffler held together machine screws epoxy Since epoxy will provide lot holding power screws small 0-80 practical screws hold things place epoxy cures no compli cated difficult jigging required real key whole thing Continued page 102 22 Model Aviation Small scale-like sport plane inverted 25 engine Air scoop aide cowl covers cornerof manifold Stacksexit open rearof cowl belowfuselage wing juncture Materials hard find Hardware building supply storescarry round squaretubing Minimum tools required arethe usual hand tools electric drill drilipress stand Hobbyists miniature lathe/milling machines help Unimat utopia Upside-down view inverted engine version muffler shows potential use upright engine Close off ends stacks add six smaller stacks out side V-12 exhaust system new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495
Edition: Model Aviation - 1979/07
Page Numbers: 20, 21, 22, 102
Bob Beckman rPMu fflers accepted rt sport Butwhy IT WASNT long ago arguments against use mufflers heard throughout land Now flying sites getting scarcer noise pollution legislation looming more evidence hearing damage mufflers accepted have ugly scaleand scale-like aircraft neatly hidden muffler system neces sary solutions part sport sport pattern fliers usual muffler tuned pipe objectionable want build fly scale scale-like airplanes theyre like warts Grecian Urn Im referring now us Sunday Scale Fliers just allout competition scale buffs worst want have muffler hidden under cowl best exhaust system functional scale outlets Several mufflers available can fit best category some types sizes scale subjects chances mounting stock muffler latest dream ship results another wart solution custom-make muffler similar accompanying photographs have building custom mufflers cars planes several years Machine tools lathe milling machine etc help always necessary have made quite serviceable units using hand tools modelers have shops greatest problem has find ing ways hold parts together temperatures involved Muffler manufacturers use castings heli-arc welding join aluminum mani 20 Model Aviation AcroSport cowl removed Note support strap around expansion chamber screwed engine mount methods materials torch welding brazing exist author having much success favors combination fasteners high-temp epoxy onlything tnat snows outsloe AcroSports cowl two very scale-like furuLuIud ,ders scale orjust scale-like aircraft minimum requirement have muffler hidden under cowl Better exhaust system functional scale outlets REC2TS T FITDOlL AED TAF FOR lITRE EXHAUSTNOUNTIBI BOLTS 1/2 ALUN PLATE BIT UP INTERIOR PRF THESE ANILES TYIIGAL MANIFOLD DESTIN FOR INVERThD ENOINE 80 SCREW 6 PLACES 4 OR 6O ICB04 \O 0 fOREGO END GA 1/2OD DRILLGD OUT 7/16 FIGURE 030SGGOJ MOThS DIlL ISO PAP 32ff PRESSURE FT PTrNI SAC ADAPTER1/2 I2IASE IURINI OR 256 STSEWD CLEARANCE HLIS 2So ITRTfWf OTT TAPP2 RILES THIS JOINT CAN RE I EPOXIED OR SEALED WITH SILICONE RUBBER I3 LONG 6-60 OR 5-32 OUNTINI BOLTS MANITLD-THAMBER JIBT DETAIL RILE TUBE TO PIT GOOBER 3 URGE TUSNT ROUND TUBING DRILL 1/6 HrLES CLEAR OTTO ETTI SAW 0f FILE OR SAE SLIT PD -ALLOW FOB REED RADIUS CUT AWAY WITH ITAZOR RAW AND/OR FILE 13 CTREfTIS FLUSH WI ITD TOT GAL END CLOSURE SECTION THAI EXHAUST STAGE FIGURE 2 folds aluminum expansion chambers Neither method practical mod elers Methods materials torch welding brazing aluminum exist Ive never much luck solution has combination ofmechan ical fasteners high temperature epoxy approach muffler design far scientific far its successful 1 Based available aluminum tubing either round square determine size location largest expansion cham ber will fit available space 2 Design manifold connect engine exhaust stack expansion cham ber manifold should a Be easily attached re moved engine b Be permanently attached expansion chamber using small screws epoxy c Have exhaust path minimum cross-sectional area great greater total area exhaust ports engine cylinder 3 Add exhaust outlets expan sion chamber a Are scale size appearance exit cowl b Are permanently attached expansion chamber screws epoxy c Have total outlet area expansion chamber equal slight ly less total area exhaust ports engine cylinder 4 Add mechanical support ex pansion chamber engine mount firewall minimize strain manifold chamber joint Fig 1 exploded view muffler AcroSport lathe milling machine needed make unit Fig 2 essentially same muffler can built using tools modelers have available use square tubing Semco adapter avoids need machining operations yet end result two scale-like exhaust stacks sticking out bottom cowl identical Fig 1 drawings show mufflers designed use horizontally mounted engines same basic design can used upright inverted engine changing way manifold mates engine ex pansion chamber Almost unlimited varia tions possible including simulated line radial engine exhausts very least can get wart inside cowl Materials really hard find Hardware building supply stores usu ally cany aluminum tubing both round square sizes large enough make expansion chambers same source can supply rod tubing exhaust stacks Manifolds can made square tubing machine tools available solid aluminum thick scrap bin local machine shop will often provide everything need specific design various pieces will depend tools available As minimum youll need usual hand tools electric drill drill-press stand miniature lathe/milling machines modelers use will help lot ultimate completely equipped machine shop sophisticated tools mean difference appearance utility manifold must easily attached engine applying unusual stresses Most newer engines have built bosses can used mount homemade muffler Try avoid straps around engine might distort cylinder Seal joint silicone rubber making final assembly various pieces muffler held together machine screws epoxy Since epoxy will provide lot holding power screws small 0-80 practical screws hold things place epoxy cures no compli cated difficult jigging required real key whole thing Continued page 102 22 Model Aviation Small scale-like sport plane inverted 25 engine Air scoop aide cowl covers cornerof manifold Stacksexit open rearof cowl belowfuselage wing juncture Materials hard find Hardware building supply storescarry round squaretubing Minimum tools required arethe usual hand tools electric drill drilipress stand Hobbyists miniature lathe/milling machines help Unimat utopia Upside-down view inverted engine version muffler shows potential use upright engine Close off ends stacks add six smaller stacks out side V-12 exhaust system new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495