/ 1 IF YOU HAVE observed full-scale aero batic flying probably enjoyed pre sentation smoke used emphasize maneuvers Most suredly smoke adds class aerobatic show am certain will interested article explains can add class model airplanes use smoke authors Acrobat Sport BipeHP 40 en gineequipped smoke system detailed article about pilot Typical modeler am reproducing something outstandingly good full scale use models challenge must has long-time desire perfect use smoke stunt model airplanes few past attempts failed recent endeavor ex plained article really works meet some years ago watched John Lenahan Utica NY fly cute little bipe very well use smoke Likewise recently observed Bob Noll Endicott NY fly model excellently similar system Both served inspiration SMOKE SYSTEM ASSEMBLYI CARB FUEL TUBING EXPANSION CHAMBER MUFFLER VENTSFUEL TANK SMOKE OIL TUBING OIL TANK SERVO PRESSURE OUT TO TANK 54 Model Aviation PRESSURE LINE IN COMBO FUEL &OIL TANK MATERIAL 008 TIN PLATE OR FUEL CAN MATERIAL ALL TUBING 1/8 BRASS FUEL COMPARTMENT PRESSURE COMPARTMENT FOR SMOKE Ii PRESSURE Fill OIL liii KI REAR VIEW OIL [jf OIL OUTLET 1II~,~ III III N Jii IIii [I SOLDER SEALED BULKHEAD IiLLA LThJ CLUNK SIZE TO SUITE MODEL Smoke systems may appear simple unless done properly either smoke will look good engine performance can suffer smoke design has proven itself presentation-wise en gine keeps working like charm addi tion smoke can turned off will very little maintenance needed much required construct smoke system other some extra space model engine pressure tap normal fuel tank engine other pressure tank carry smoke oil expansion chamber-style muffler pressure control valve Also order possess ability turn smoke off will fifth servo needed second best way use high throttle trim op erate pressure valve above items may either purchased made yourself friendly machinist following information will help what ever decision First engine needs pressure tap fitting transmits crankcase pressure about 3 lbs PSI pressure tank Most sport stunt engines have pressure fittings however simple install Fox K&B have pressure fit tings purchase convenient way install pressure fitting re place engines crankcase screws fitting itself doing cer tain screw hole opens crank case inside fails sim ply deepen original hole drill other inside crankcase meet present screw hole Two fuel tanks needed ex plained later two-compartment tank similar made model may used employing two tanks model use the first tank usual engine fuel second tank may similar first must ca pable being sealed plugged hold pressure vent system neeeded fuel tank required will have use two vents filling pressure inlet Quite often pressure tank may sealed simply slipping piece plugged fuel tubing over fill tube no room oil tank particular model did have over sized fuel tank compartment making tank tailor-fit tank compartment gained enough capacity use two compartment tank would hold enough fuel smoke oil required normal flight Information about building two compartment tank illustrated ar ticle About really needed construction some 1/8 brass tub ing about 008 tinplate An old gallon fuel can will yield tinplate no cost pressure shut-off valve key smoke system pressure tap closed idle speeds possible loss pressure could effect idle engine Also before flight pressure tap open engine running smoke oil can drain tank engine flooding fouling up fuel mixture course ability shut pressure valve off will what al lows smoke display start stop flight important keep pressure valve closed en gine running idle speed ground addition supply tank made own control value However can easily purchased Rhom-Air similar brand retract gear system includes pressure valve Such valve will work fine smoke system prefer make own valve some machining required have work properly will need following material short piece Y4 ID brass tubing slightly longer piece inum brass rod three /4 OD 0 ring seals simple sliding type shut-off valve first position allows pres sure pass oil tank valve slid second position tank outlet will sealed off valve acts seal keep pressure en gine assured no pressure leakage will disrupt engines performance turn page 093218125203093562 2 IIII 312375 063 RING#52 DRILL WASHER #52 DRILL*42 DRILL 7/8D Ii ID BRASS TUBE ___________I/8OD 7/8VALVE CLOSED 1 5/8 VALVE OPEN PRESSURE VALVE RANCE OR- 005j February 1977 55 - NI I -.I ~ VENTSPRESSURE IIINLET - FUEL TO CARB Valve construction Cut / ID tubing size Polish inside tubing very important slide operate freely 0 ring seals create considerable fric tion Polishing easily done excel lent results Take piece en dowel rod sized slip-fit tubing Coat dowel rod lapping compound rotate inside tubing keeping smooth finish mind slide rod should slip-fit inside tubing nor mally after polishing tube First drill inlet hole end rod blind hole Secondly cut 0 ring slats rod relief area outlet hole will placed valve seal properly yet still move freely impor tant 0 ring slots sized cor rectly Polish off burrs complete turning blind hole end rod sized accept fuel line tubing Next drill outlet hole blind hole relief area Flatten remain ing end rod file drill hole pushrod clevis attach ment rod should now move freely tube Solder outlet tube valve tube Drill 1/6 hole through valve tube inside outlet tube Solder fastening bracket valve tube re quired mounting Remove burrs caused drilling Clean inside tube thoroughly solvent Slip 0 rings rod Lubricate well Insert rod tube rod does move easily polish inside tube until does valve now completed ready use muffler serves vaporizing chamber smoke oil Heat muffler causes oil vaporize other types mufflers will work ex pansion chamber-style muffler best holds oil longer heating vaporizing better An inlet fitting oil line neces sary muffler mufflers al ready have pressure fitting will continued page 8] Skywriter Below The dual compartment tank pres sure valve slide removed tube Required pressure tap expansion type muffler 56 Model Aviation Above Another view dual compartment tank pressure valve position Old fuel can good source tinplate Left The tank can custom tailored fuselage appropriate size airplane careful fueling oil fuelmistake can frustrating fifth servo required operate system second best use high throttle trim operate valve 600 feet before went test se quence Compression off gb-plug dive five secondscompression worked worked well decided try shallower dive would use whole 150 feet altitude Again worked well Up until now allowed engine really stop dead didnt pro duce power still spun still flying thought would give try Compression off compression compression off gb-plug dive 100 feet compression Nothing happened tried again 250-foot 30-degree dive allow plenty spin-up roared life What relief Two tries pro duced starts flight Out eight tries got six starts various dive angles days efforts arent stopping Improvements occur us often system becom ing feasible general modeling feel can eliminate excessive diving using higher pitch prop symmetrical airfoil will also free dependence gb-plug power throttle allow different settings starting addition engine modifications extra servo C-cell nicad added Extra weight 3 ounces Photo Bill Watson have interest sytem restart glider motor ther mals fade just want talk shop write SC Watson 1358 Rollercoaster Rd Tuescon Arizona 85704 Skywriter/de Bolt continued page 56 fine install crankcase pressure fittings best loca tion fitting close en gine exhaust possible greatest amount heat Plumbing procedure Connect fuel tank usual Run fuel tubing shut-off valve pressure tap engine tubing must plastic surgical rubber Mineral oil affects pure rubber tubing Connect another piece tubing oil tank outlet muffler fitting certain tubing fits tightly pressure could blow off Most combusti ble oil will smoke Normal home fuel oil automotive diesel fuel kerosene will work whatever readily available important always fill oil oil tank fuel fuel tank Speaking experience mix-up can extremely frustrating Skywriting Procedure First make sure pressure valve closed position may get false engine setting start engine tune check its oper ation Once engine operating cor rectly smoke can used will Oil consumption high best conserve smoke using dis play desired Smoke effect real istic controlled displayed dramatic maneuvers Creating smoke system model aircraft very rewarding project will become proud recipient count less hours enjoyment Skywriting pos sibilities endless Aerobatics can mastered easily helpful aid smoke Paint self creative pictures sky bit fancy writing Play tic-tac-toe flier buddy Send smoke signals wife may little late din ner Advertise favorite club huge smoke letters Show best gal much love draw name encircled smoke heart instance will out standing member club skywrit ing arouses awe envy wherever demonstrated February 1977 81 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Solar 5IotFilm HOT FUEL PROOF DOPEEXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel prool lightweight PUCIUM IncIuStrie8 InC 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028
Edition: Model Aviation - 1977/02
Page Numbers: 54, 55, 56, 81
/ 1 IF YOU HAVE observed full-scale aero batic flying probably enjoyed pre sentation smoke used emphasize maneuvers Most suredly smoke adds class aerobatic show am certain will interested article explains can add class model airplanes use smoke authors Acrobat Sport BipeHP 40 en gineequipped smoke system detailed article about pilot Typical modeler am reproducing something outstandingly good full scale use models challenge must has long-time desire perfect use smoke stunt model airplanes few past attempts failed recent endeavor ex plained article really works meet some years ago watched John Lenahan Utica NY fly cute little bipe very well use smoke Likewise recently observed Bob Noll Endicott NY fly model excellently similar system Both served inspiration SMOKE SYSTEM ASSEMBLYI CARB FUEL TUBING EXPANSION CHAMBER MUFFLER VENTSFUEL TANK SMOKE OIL TUBING OIL TANK SERVO PRESSURE OUT TO TANK 54 Model Aviation PRESSURE LINE IN COMBO FUEL &OIL TANK MATERIAL 008 TIN PLATE OR FUEL CAN MATERIAL ALL TUBING 1/8 BRASS FUEL COMPARTMENT PRESSURE COMPARTMENT FOR SMOKE Ii PRESSURE Fill OIL liii KI REAR VIEW OIL [jf OIL OUTLET 1II~,~ III III N Jii IIii [I SOLDER SEALED BULKHEAD IiLLA LThJ CLUNK SIZE TO SUITE MODEL Smoke systems may appear simple unless done properly either smoke will look good engine performance can suffer smoke design has proven itself presentation-wise en gine keeps working like charm addi tion smoke can turned off will very little maintenance needed much required construct smoke system other some extra space model engine pressure tap normal fuel tank engine other pressure tank carry smoke oil expansion chamber-style muffler pressure control valve Also order possess ability turn smoke off will fifth servo needed second best way use high throttle trim op erate pressure valve above items may either purchased made yourself friendly machinist following information will help what ever decision First engine needs pressure tap fitting transmits crankcase pressure about 3 lbs PSI pressure tank Most sport stunt engines have pressure fittings however simple install Fox K&B have pressure fit tings purchase convenient way install pressure fitting re place engines crankcase screws fitting itself doing cer tain screw hole opens crank case inside fails sim ply deepen original hole drill other inside crankcase meet present screw hole Two fuel tanks needed ex plained later two-compartment tank similar made model may used employing two tanks model use the first tank usual engine fuel second tank may similar first must ca pable being sealed plugged hold pressure vent system neeeded fuel tank required will have use two vents filling pressure inlet Quite often pressure tank may sealed simply slipping piece plugged fuel tubing over fill tube no room oil tank particular model did have over sized fuel tank compartment making tank tailor-fit tank compartment gained enough capacity use two compartment tank would hold enough fuel smoke oil required normal flight Information about building two compartment tank illustrated ar ticle About really needed construction some 1/8 brass tub ing about 008 tinplate An old gallon fuel can will yield tinplate no cost pressure shut-off valve key smoke system pressure tap closed idle speeds possible loss pressure could effect idle engine Also before flight pressure tap open engine running smoke oil can drain tank engine flooding fouling up fuel mixture course ability shut pressure valve off will what al lows smoke display start stop flight important keep pressure valve closed en gine running idle speed ground addition supply tank made own control value However can easily purchased Rhom-Air similar brand retract gear system includes pressure valve Such valve will work fine smoke system prefer make own valve some machining required have work properly will need following material short piece Y4 ID brass tubing slightly longer piece inum brass rod three /4 OD 0 ring seals simple sliding type shut-off valve first position allows pres sure pass oil tank valve slid second position tank outlet will sealed off valve acts seal keep pressure en gine assured no pressure leakage will disrupt engines performance turn page 093218125203093562 2 IIII 312375 063 RING#52 DRILL WASHER #52 DRILL*42 DRILL 7/8D Ii ID BRASS TUBE ___________I/8OD 7/8VALVE CLOSED 1 5/8 VALVE OPEN PRESSURE VALVE RANCE OR- 005j February 1977 55 - NI I -.I ~ VENTSPRESSURE IIINLET - FUEL TO CARB Valve construction Cut / ID tubing size Polish inside tubing very important slide operate freely 0 ring seals create considerable fric tion Polishing easily done excel lent results Take piece en dowel rod sized slip-fit tubing Coat dowel rod lapping compound rotate inside tubing keeping smooth finish mind slide rod should slip-fit inside tubing nor mally after polishing tube First drill inlet hole end rod blind hole Secondly cut 0 ring slats rod relief area outlet hole will placed valve seal properly yet still move freely impor tant 0 ring slots sized cor rectly Polish off burrs complete turning blind hole end rod sized accept fuel line tubing Next drill outlet hole blind hole relief area Flatten remain ing end rod file drill hole pushrod clevis attach ment rod should now move freely tube Solder outlet tube valve tube Drill 1/6 hole through valve tube inside outlet tube Solder fastening bracket valve tube re quired mounting Remove burrs caused drilling Clean inside tube thoroughly solvent Slip 0 rings rod Lubricate well Insert rod tube rod does move easily polish inside tube until does valve now completed ready use muffler serves vaporizing chamber smoke oil Heat muffler causes oil vaporize other types mufflers will work ex pansion chamber-style muffler best holds oil longer heating vaporizing better An inlet fitting oil line neces sary muffler mufflers al ready have pressure fitting will continued page 8] Skywriter Below The dual compartment tank pres sure valve slide removed tube Required pressure tap expansion type muffler 56 Model Aviation Above Another view dual compartment tank pressure valve position Old fuel can good source tinplate Left The tank can custom tailored fuselage appropriate size airplane careful fueling oil fuelmistake can frustrating fifth servo required operate system second best use high throttle trim operate valve 600 feet before went test se quence Compression off gb-plug dive five secondscompression worked worked well decided try shallower dive would use whole 150 feet altitude Again worked well Up until now allowed engine really stop dead didnt pro duce power still spun still flying thought would give try Compression off compression compression off gb-plug dive 100 feet compression Nothing happened tried again 250-foot 30-degree dive allow plenty spin-up roared life What relief Two tries pro duced starts flight Out eight tries got six starts various dive angles days efforts arent stopping Improvements occur us often system becom ing feasible general modeling feel can eliminate excessive diving using higher pitch prop symmetrical airfoil will also free dependence gb-plug power throttle allow different settings starting addition engine modifications extra servo C-cell nicad added Extra weight 3 ounces Photo Bill Watson have interest sytem restart glider motor ther mals fade just want talk shop write SC Watson 1358 Rollercoaster Rd Tuescon Arizona 85704 Skywriter/de Bolt continued page 56 fine install crankcase pressure fittings best loca tion fitting close en gine exhaust possible greatest amount heat Plumbing procedure Connect fuel tank usual Run fuel tubing shut-off valve pressure tap engine tubing must plastic surgical rubber Mineral oil affects pure rubber tubing Connect another piece tubing oil tank outlet muffler fitting certain tubing fits tightly pressure could blow off Most combusti ble oil will smoke Normal home fuel oil automotive diesel fuel kerosene will work whatever readily available important always fill oil oil tank fuel fuel tank Speaking experience mix-up can extremely frustrating Skywriting Procedure First make sure pressure valve closed position may get false engine setting start engine tune check its oper ation Once engine operating cor rectly smoke can used will Oil consumption high best conserve smoke using dis play desired Smoke effect real istic controlled displayed dramatic maneuvers Creating smoke system model aircraft very rewarding project will become proud recipient count less hours enjoyment Skywriting pos sibilities endless Aerobatics can mastered easily helpful aid smoke Paint self creative pictures sky bit fancy writing Play tic-tac-toe flier buddy Send smoke signals wife may little late din ner Advertise favorite club huge smoke letters Show best gal much love draw name encircled smoke heart instance will out standing member club skywrit ing arouses awe envy wherever demonstrated February 1977 81 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Solar 5IotFilm HOT FUEL PROOF DOPEEXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel prool lightweight PUCIUM IncIuStrie8 InC 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028
Edition: Model Aviation - 1977/02
Page Numbers: 54, 55, 56, 81
/ 1 IF YOU HAVE observed full-scale aero batic flying probably enjoyed pre sentation smoke used emphasize maneuvers Most suredly smoke adds class aerobatic show am certain will interested article explains can add class model airplanes use smoke authors Acrobat Sport BipeHP 40 en gineequipped smoke system detailed article about pilot Typical modeler am reproducing something outstandingly good full scale use models challenge must has long-time desire perfect use smoke stunt model airplanes few past attempts failed recent endeavor ex plained article really works meet some years ago watched John Lenahan Utica NY fly cute little bipe very well use smoke Likewise recently observed Bob Noll Endicott NY fly model excellently similar system Both served inspiration SMOKE SYSTEM ASSEMBLYI CARB FUEL TUBING EXPANSION CHAMBER MUFFLER VENTSFUEL TANK SMOKE OIL TUBING OIL TANK SERVO PRESSURE OUT TO TANK 54 Model Aviation PRESSURE LINE IN COMBO FUEL &OIL TANK MATERIAL 008 TIN PLATE OR FUEL CAN MATERIAL ALL TUBING 1/8 BRASS FUEL COMPARTMENT PRESSURE COMPARTMENT FOR SMOKE Ii PRESSURE Fill OIL liii KI REAR VIEW OIL [jf OIL OUTLET 1II~,~ III III N Jii IIii [I SOLDER SEALED BULKHEAD IiLLA LThJ CLUNK SIZE TO SUITE MODEL Smoke systems may appear simple unless done properly either smoke will look good engine performance can suffer smoke design has proven itself presentation-wise en gine keeps working like charm addi tion smoke can turned off will very little maintenance needed much required construct smoke system other some extra space model engine pressure tap normal fuel tank engine other pressure tank carry smoke oil expansion chamber-style muffler pressure control valve Also order possess ability turn smoke off will fifth servo needed second best way use high throttle trim op erate pressure valve above items may either purchased made yourself friendly machinist following information will help what ever decision First engine needs pressure tap fitting transmits crankcase pressure about 3 lbs PSI pressure tank Most sport stunt engines have pressure fittings however simple install Fox K&B have pressure fit tings purchase convenient way install pressure fitting re place engines crankcase screws fitting itself doing cer tain screw hole opens crank case inside fails sim ply deepen original hole drill other inside crankcase meet present screw hole Two fuel tanks needed ex plained later two-compartment tank similar made model may used employing two tanks model use the first tank usual engine fuel second tank may similar first must ca pable being sealed plugged hold pressure vent system neeeded fuel tank required will have use two vents filling pressure inlet Quite often pressure tank may sealed simply slipping piece plugged fuel tubing over fill tube no room oil tank particular model did have over sized fuel tank compartment making tank tailor-fit tank compartment gained enough capacity use two compartment tank would hold enough fuel smoke oil required normal flight Information about building two compartment tank illustrated ar ticle About really needed construction some 1/8 brass tub ing about 008 tinplate An old gallon fuel can will yield tinplate no cost pressure shut-off valve key smoke system pressure tap closed idle speeds possible loss pressure could effect idle engine Also before flight pressure tap open engine running smoke oil can drain tank engine flooding fouling up fuel mixture course ability shut pressure valve off will what al lows smoke display start stop flight important keep pressure valve closed en gine running idle speed ground addition supply tank made own control value However can easily purchased Rhom-Air similar brand retract gear system includes pressure valve Such valve will work fine smoke system prefer make own valve some machining required have work properly will need following material short piece Y4 ID brass tubing slightly longer piece inum brass rod three /4 OD 0 ring seals simple sliding type shut-off valve first position allows pres sure pass oil tank valve slid second position tank outlet will sealed off valve acts seal keep pressure en gine assured no pressure leakage will disrupt engines performance turn page 093218125203093562 2 IIII 312375 063 RING#52 DRILL WASHER #52 DRILL*42 DRILL 7/8D Ii ID BRASS TUBE ___________I/8OD 7/8VALVE CLOSED 1 5/8 VALVE OPEN PRESSURE VALVE RANCE OR- 005j February 1977 55 - NI I -.I ~ VENTSPRESSURE IIINLET - FUEL TO CARB Valve construction Cut / ID tubing size Polish inside tubing very important slide operate freely 0 ring seals create considerable fric tion Polishing easily done excel lent results Take piece en dowel rod sized slip-fit tubing Coat dowel rod lapping compound rotate inside tubing keeping smooth finish mind slide rod should slip-fit inside tubing nor mally after polishing tube First drill inlet hole end rod blind hole Secondly cut 0 ring slats rod relief area outlet hole will placed valve seal properly yet still move freely impor tant 0 ring slots sized cor rectly Polish off burrs complete turning blind hole end rod sized accept fuel line tubing Next drill outlet hole blind hole relief area Flatten remain ing end rod file drill hole pushrod clevis attach ment rod should now move freely tube Solder outlet tube valve tube Drill 1/6 hole through valve tube inside outlet tube Solder fastening bracket valve tube re quired mounting Remove burrs caused drilling Clean inside tube thoroughly solvent Slip 0 rings rod Lubricate well Insert rod tube rod does move easily polish inside tube until does valve now completed ready use muffler serves vaporizing chamber smoke oil Heat muffler causes oil vaporize other types mufflers will work ex pansion chamber-style muffler best holds oil longer heating vaporizing better An inlet fitting oil line neces sary muffler mufflers al ready have pressure fitting will continued page 8] Skywriter Below The dual compartment tank pres sure valve slide removed tube Required pressure tap expansion type muffler 56 Model Aviation Above Another view dual compartment tank pressure valve position Old fuel can good source tinplate Left The tank can custom tailored fuselage appropriate size airplane careful fueling oil fuelmistake can frustrating fifth servo required operate system second best use high throttle trim operate valve 600 feet before went test se quence Compression off gb-plug dive five secondscompression worked worked well decided try shallower dive would use whole 150 feet altitude Again worked well Up until now allowed engine really stop dead didnt pro duce power still spun still flying thought would give try Compression off compression compression off gb-plug dive 100 feet compression Nothing happened tried again 250-foot 30-degree dive allow plenty spin-up roared life What relief Two tries pro duced starts flight Out eight tries got six starts various dive angles days efforts arent stopping Improvements occur us often system becom ing feasible general modeling feel can eliminate excessive diving using higher pitch prop symmetrical airfoil will also free dependence gb-plug power throttle allow different settings starting addition engine modifications extra servo C-cell nicad added Extra weight 3 ounces Photo Bill Watson have interest sytem restart glider motor ther mals fade just want talk shop write SC Watson 1358 Rollercoaster Rd Tuescon Arizona 85704 Skywriter/de Bolt continued page 56 fine install crankcase pressure fittings best loca tion fitting close en gine exhaust possible greatest amount heat Plumbing procedure Connect fuel tank usual Run fuel tubing shut-off valve pressure tap engine tubing must plastic surgical rubber Mineral oil affects pure rubber tubing Connect another piece tubing oil tank outlet muffler fitting certain tubing fits tightly pressure could blow off Most combusti ble oil will smoke Normal home fuel oil automotive diesel fuel kerosene will work whatever readily available important always fill oil oil tank fuel fuel tank Speaking experience mix-up can extremely frustrating Skywriting Procedure First make sure pressure valve closed position may get false engine setting start engine tune check its oper ation Once engine operating cor rectly smoke can used will Oil consumption high best conserve smoke using dis play desired Smoke effect real istic controlled displayed dramatic maneuvers Creating smoke system model aircraft very rewarding project will become proud recipient count less hours enjoyment Skywriting pos sibilities endless Aerobatics can mastered easily helpful aid smoke Paint self creative pictures sky bit fancy writing Play tic-tac-toe flier buddy Send smoke signals wife may little late din ner Advertise favorite club huge smoke letters Show best gal much love draw name encircled smoke heart instance will out standing member club skywrit ing arouses awe envy wherever demonstrated February 1977 81 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Solar 5IotFilm HOT FUEL PROOF DOPEEXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel prool lightweight PUCIUM IncIuStrie8 InC 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028
Edition: Model Aviation - 1977/02
Page Numbers: 54, 55, 56, 81
/ 1 IF YOU HAVE observed full-scale aero batic flying probably enjoyed pre sentation smoke used emphasize maneuvers Most suredly smoke adds class aerobatic show am certain will interested article explains can add class model airplanes use smoke authors Acrobat Sport BipeHP 40 en gineequipped smoke system detailed article about pilot Typical modeler am reproducing something outstandingly good full scale use models challenge must has long-time desire perfect use smoke stunt model airplanes few past attempts failed recent endeavor ex plained article really works meet some years ago watched John Lenahan Utica NY fly cute little bipe very well use smoke Likewise recently observed Bob Noll Endicott NY fly model excellently similar system Both served inspiration SMOKE SYSTEM ASSEMBLYI CARB FUEL TUBING EXPANSION CHAMBER MUFFLER VENTSFUEL TANK SMOKE OIL TUBING OIL TANK SERVO PRESSURE OUT TO TANK 54 Model Aviation PRESSURE LINE IN COMBO FUEL &OIL TANK MATERIAL 008 TIN PLATE OR FUEL CAN MATERIAL ALL TUBING 1/8 BRASS FUEL COMPARTMENT PRESSURE COMPARTMENT FOR SMOKE Ii PRESSURE Fill OIL liii KI REAR VIEW OIL [jf OIL OUTLET 1II~,~ III III N Jii IIii [I SOLDER SEALED BULKHEAD IiLLA LThJ CLUNK SIZE TO SUITE MODEL Smoke systems may appear simple unless done properly either smoke will look good engine performance can suffer smoke design has proven itself presentation-wise en gine keeps working like charm addi tion smoke can turned off will very little maintenance needed much required construct smoke system other some extra space model engine pressure tap normal fuel tank engine other pressure tank carry smoke oil expansion chamber-style muffler pressure control valve Also order possess ability turn smoke off will fifth servo needed second best way use high throttle trim op erate pressure valve above items may either purchased made yourself friendly machinist following information will help what ever decision First engine needs pressure tap fitting transmits crankcase pressure about 3 lbs PSI pressure tank Most sport stunt engines have pressure fittings however simple install Fox K&B have pressure fit tings purchase convenient way install pressure fitting re place engines crankcase screws fitting itself doing cer tain screw hole opens crank case inside fails sim ply deepen original hole drill other inside crankcase meet present screw hole Two fuel tanks needed ex plained later two-compartment tank similar made model may used employing two tanks model use the first tank usual engine fuel second tank may similar first must ca pable being sealed plugged hold pressure vent system neeeded fuel tank required will have use two vents filling pressure inlet Quite often pressure tank may sealed simply slipping piece plugged fuel tubing over fill tube no room oil tank particular model did have over sized fuel tank compartment making tank tailor-fit tank compartment gained enough capacity use two compartment tank would hold enough fuel smoke oil required normal flight Information about building two compartment tank illustrated ar ticle About really needed construction some 1/8 brass tub ing about 008 tinplate An old gallon fuel can will yield tinplate no cost pressure shut-off valve key smoke system pressure tap closed idle speeds possible loss pressure could effect idle engine Also before flight pressure tap open engine running smoke oil can drain tank engine flooding fouling up fuel mixture course ability shut pressure valve off will what al lows smoke display start stop flight important keep pressure valve closed en gine running idle speed ground addition supply tank made own control value However can easily purchased Rhom-Air similar brand retract gear system includes pressure valve Such valve will work fine smoke system prefer make own valve some machining required have work properly will need following material short piece Y4 ID brass tubing slightly longer piece inum brass rod three /4 OD 0 ring seals simple sliding type shut-off valve first position allows pres sure pass oil tank valve slid second position tank outlet will sealed off valve acts seal keep pressure en gine assured no pressure leakage will disrupt engines performance turn page 093218125203093562 2 IIII 312375 063 RING#52 DRILL WASHER #52 DRILL*42 DRILL 7/8D Ii ID BRASS TUBE ___________I/8OD 7/8VALVE CLOSED 1 5/8 VALVE OPEN PRESSURE VALVE RANCE OR- 005j February 1977 55 - NI I -.I ~ VENTSPRESSURE IIINLET - FUEL TO CARB Valve construction Cut / ID tubing size Polish inside tubing very important slide operate freely 0 ring seals create considerable fric tion Polishing easily done excel lent results Take piece en dowel rod sized slip-fit tubing Coat dowel rod lapping compound rotate inside tubing keeping smooth finish mind slide rod should slip-fit inside tubing nor mally after polishing tube First drill inlet hole end rod blind hole Secondly cut 0 ring slats rod relief area outlet hole will placed valve seal properly yet still move freely impor tant 0 ring slots sized cor rectly Polish off burrs complete turning blind hole end rod sized accept fuel line tubing Next drill outlet hole blind hole relief area Flatten remain ing end rod file drill hole pushrod clevis attach ment rod should now move freely tube Solder outlet tube valve tube Drill 1/6 hole through valve tube inside outlet tube Solder fastening bracket valve tube re quired mounting Remove burrs caused drilling Clean inside tube thoroughly solvent Slip 0 rings rod Lubricate well Insert rod tube rod does move easily polish inside tube until does valve now completed ready use muffler serves vaporizing chamber smoke oil Heat muffler causes oil vaporize other types mufflers will work ex pansion chamber-style muffler best holds oil longer heating vaporizing better An inlet fitting oil line neces sary muffler mufflers al ready have pressure fitting will continued page 8] Skywriter Below The dual compartment tank pres sure valve slide removed tube Required pressure tap expansion type muffler 56 Model Aviation Above Another view dual compartment tank pressure valve position Old fuel can good source tinplate Left The tank can custom tailored fuselage appropriate size airplane careful fueling oil fuelmistake can frustrating fifth servo required operate system second best use high throttle trim operate valve 600 feet before went test se quence Compression off gb-plug dive five secondscompression worked worked well decided try shallower dive would use whole 150 feet altitude Again worked well Up until now allowed engine really stop dead didnt pro duce power still spun still flying thought would give try Compression off compression compression off gb-plug dive 100 feet compression Nothing happened tried again 250-foot 30-degree dive allow plenty spin-up roared life What relief Two tries pro duced starts flight Out eight tries got six starts various dive angles days efforts arent stopping Improvements occur us often system becom ing feasible general modeling feel can eliminate excessive diving using higher pitch prop symmetrical airfoil will also free dependence gb-plug power throttle allow different settings starting addition engine modifications extra servo C-cell nicad added Extra weight 3 ounces Photo Bill Watson have interest sytem restart glider motor ther mals fade just want talk shop write SC Watson 1358 Rollercoaster Rd Tuescon Arizona 85704 Skywriter/de Bolt continued page 56 fine install crankcase pressure fittings best loca tion fitting close en gine exhaust possible greatest amount heat Plumbing procedure Connect fuel tank usual Run fuel tubing shut-off valve pressure tap engine tubing must plastic surgical rubber Mineral oil affects pure rubber tubing Connect another piece tubing oil tank outlet muffler fitting certain tubing fits tightly pressure could blow off Most combusti ble oil will smoke Normal home fuel oil automotive diesel fuel kerosene will work whatever readily available important always fill oil oil tank fuel fuel tank Speaking experience mix-up can extremely frustrating Skywriting Procedure First make sure pressure valve closed position may get false engine setting start engine tune check its oper ation Once engine operating cor rectly smoke can used will Oil consumption high best conserve smoke using dis play desired Smoke effect real istic controlled displayed dramatic maneuvers Creating smoke system model aircraft very rewarding project will become proud recipient count less hours enjoyment Skywriting pos sibilities endless Aerobatics can mastered easily helpful aid smoke Paint self creative pictures sky bit fancy writing Play tic-tac-toe flier buddy Send smoke signals wife may little late din ner Advertise favorite club huge smoke letters Show best gal much love draw name encircled smoke heart instance will out standing member club skywrit ing arouses awe envy wherever demonstrated February 1977 81 TRY THESE OTHER CONTEST QUALITY PRODUCTS FROM PACTRA Solar 5IotFilm HOT FUEL PROOF DOPEEXCLUSIVE LOWHEAT AWARD WINNINGCOVERING FOR HI-GLOSS AND FLATFOAM & BALSA FINISHES AVAILABLEFLYING MODELS IN OVER 36 COLORSflexible ble IN BRUSH AND SPRAYfuel prool lightweight PUCIUM IncIuStrie8 InC 7060 HOLLYWOOD BLVD LOS ANGELES CA 90028