Radio Technic George M Myers MONITORING RF environment Last month asked What will switchable-RF transmitter SRF shows up field know Ive just changed S synthesized switchable dont wony about Whats important fact switching its done month going look couple defense mechanisms first defense mechanism bell cat Figure 1 shows special flag SRF transmitters have proposed flag used identify such transmitters points out threat transmitter might switch frequency un mistakable way assume numbers will printed 10-page comic book would slip transparent plastic sleeve Therefore whenever owner switched channels would have to notify would turn some pages Everything stores transmitter Noth ing forgotten home work bench No problems pastel colors color-blind RCers proposal accepted may see 1984-85 AMA rule book several crashes 1983 Nats Since crashes seemed related Ii Jr Fl FD 41 RED RIBBON WHITE FiELDS BLACK NUMERALS 1 212H x 1W x ue jL 1/4 Stroke FIGURE 1 Remember good old days RC transmitters transmitted frequency Well times about endbecause new switchable-frequency SF sets about appear market George has proposed SF sets should have special frequency flaga red warn other fliers set capable being air channel owner such set would unable carry complete set tha color-coded flags anywayand could ever remember flag went channel SF transmitter would have carry complete set channel numbers slip frequency-flag windows though interference frequencies 72160 75640 MHz cry went up werent told about answer Nats Committee hn Lange 721 converter combined old automobile radio have capability monitor RC channelsas well Commercial Carriers between channels two sets owned AMA Bob Aberle photo again maybe could build monitor right transmitterlike George did Ace Silver Seven small RC receiver loudspeaker right inside case 38 Model Aviation cause didnt know about would suppose someone used monitor check such interference before fact Someone checked during problem Dan Kahn trapped interference 72160 75640 interference inter mittent youve got hap pens need proper tools detect set up monitor 72-73 MHz band 75 World Engines Airtronics scanners flight line impound tables too close flight line much use beyond catching returned transmitter left ON weekends like precious wait week chance fly rains wife comes up some last-minute Honey dos car needs fixing kids want take somewhere friend wants something else Such things breed frus tration miss weekend flying dont miss few hours field miss least week because thats long will take next opportunity come around crash due interference lose week because have find time repairs before can look time fly Monitoring RF environ ment deducts flying time deduction greater time spent making repairs So arent people doing monitoring arent second defense mechanism monitor ing ways monitoring Figure 2 shows cheapest possible way Look folks order fly safely future some places its now youd better protect yourself monitoring what RC channel youre using George gave us information Bird Dog frequency monitoring system January 1982 issuenow hems latest low-priced modi fication Youll need cheap AM radio under $10 old servo cabie/connector set plug jack some wIre solder give usable dedicated frequency monitor Thems no good excuse failing monitor own frequencyl version Electronic Bird-dog Janu Continued page 138 May 1984 39 _ CHEAP AM RECEIVER TO RECEIVER 1 N I________________ EXCHANGE TWO WIRES ON THE EARPHONE JACK TO OBTAIN THE CIRCUIT SHOWN FIGURE 2 H) ) ) LISTEN TO WHAT YOUR AIRPLANE HEARS TUNE FOR BEST SOUND BY TWISTING THE OUTPUT ARM 1 REMOVE SERVO MOTOR SERVO PLUGSERVO2 INSTALL EARPHONE YOUR RECEIVERCABLE IN ITS PLACE 3 DISREGARD WIRE SOLDER ED TO THESERVO MOTOR SHELL ITS GROUND WIRECLIP IT / Heres Radio Shack programmable scanner built Australian market Jack Aibrecht bought AMA business trip Australia can monitor US RC channels Bill Hershberger made some minor modifications Improve little Photo Aberie AMA past-president Walt Good sent us photo classy frequency control board used club Florida colored frequency-flag miniatures have clipped AMA New Frequency centerfold published Febmary 1983 issue Copies centerfold available request PR Dept AMA HO Pieces 1M plywood glued transmitter pins clipped-out miniature channel flags glued ply ILZUZL a/c 361 Iso RoadSan Antonio TX 73216 512 414712 FUTABA 7FGKFM23395 6FGK FMSOLD OUT 7FGK18495 6FGK16495 5FGK15495 6FG15495 4FG14995 4L3-5/2810495 2F2/S-28-R4H7495 S-28SERVO1895 5-32SERVO2595 COVERINGS Monokote Opaque 3 Rolls1695 Monokoge Trans. 3 Rolls1695 Monokote Met. 3 Rolls2095 CYANOACRYLATE Hot Stuff HS-t e169 Itol Stuff HSTl /z Ounce169 Hot Stuff HS-4 2 Ounce589 Hot Stuff HST-4 2 Ounce539 Slot Shot245 Jet Ouncet79 Super Jet e179 Jet 2 Ounce599 Super Jet 2 Ounce599 EPOXY GLUE Deveon 30 Minute 9 Ounce595 Devrou 5 Minute 9 Ounce595 Hobbypoxy 113 Ounce359 tiobbypoxy IV 3 Ounce559 Hobbypoxy III 3 Ounce295 SULLIVAN HT #600 Starter2795 HTD #601 Starter3095 HTD24 #602 Starter3295 PLEASE NOTE Prices subject change manufacturers prices change items subject availability time sale Prices effect until next Model Aviation Issue Show room prices may slightly higher Visit show room San Antonio jW discount price list refunded first order Shipping& Handling Prepaid orders S300 COD Credit Card orders 5595 Overseas orders add estimated shipping 25% deposit re4uired first lime COD 55% sates tax required Texas residents Personal checks delay shipping 15 days Cavalier/Laycock Continued oaae 135 hole get below engine mount better have too much paint enough ready cover fuselage now time add main landing gear After covering add tail wheel assembly wing tail hold-down dowels tray method radio installation has worked fine Use epoxy mount tray Incidentally tray strengthens center fuselage sure about getting center gravity CG lo cated correctly install radio tray last move fore aft get proper balance position Wing Once ribs cut wing panels assemble quite fast Incidentally four ribs can cut 3 x 36-in sheet made rib template As ply splicing two pieces together make big enough piece Build wing half flat plan Before joining two wing halves com plete wing tips easier work just half wing number ways join wing halves have favorite means go ahead use method works well follows As build wing half trim spars leading trailing edges correct length dihedral angle dihedral angle template very useful worth effort necessary make Build both wing halves add Vs-in center rib wing half Blockup half bring two halves together check fit satisfied glue epoxy Now have complete wing needing dihedral reinforcing Carefully slot center ribs dihedral braces Glue epoxy clamp place Finally add shear webs wing ready final sanding Tail Construction straightforward Square ends crosspieces sanding block careful cutting slots hinges Unless hinge pins exactly line will take extra force move control surface putting extra load radio servo battery Whether make tail assembly remov able epoxy permanently fuselage usually depends space ve hicle mid-sized two-door Ameri can car can carry wing inside pas senger area fuselage removable tail carried trunk transporta tion permits one-piece fuselage tail build wayyoull save yourself some extra work Finishing used translucent Super Mono Kote looks great built-up fuselage also adds sense being light weight wing tail can covered two rolls pieces cut shown plan use method make Super MonoKote lap joint over wing rib dont shrink part until whole wing has covered Make sure lap joint well-sealed use regular house hold iron final shrinking trim around windows used /4-in pressure-sensitive tape After cover ing add tip skids wing horizon tal taildont fly holding wing down make six 10-in loops use 20 rubber -in rubber strip Flying will find Cavalier easy plane fly However havent flown multi-channel RC before suggest have qualified flier help during early flights Cavalier doesnt have vices Its likely ground-loop take off landing Basic commonsense rules apply take off make sure model heading directly wind important lightly-loaded models such Cavalier Landings fun final approach should directly wind Cut engine throttle idle Add up-elevator trim establish glide start flare-out model about six feet above ground Keep giving vp-elevator until touch-down stick should way back point As takeoff very little roll windy weather dont attempt taxiing Once model turned crosswind wind will tend flip over does very little damage modelthe wing strongbut does spoil otherwise good landing usually kill engine carry model back pits Have fun building flying Cavalier Its model pushing state art honest goodness fun flier Radio Technique/Myers Continued page 39 ary 1982 MA page 30 can used monitoring tool arent flying can go off flight line about 500 feet plug Bird-dog airplane turn ON try find out whats hap pening channel unit draws quite bit flight pack about 300 mA use Ace Fast Field Charger 34K40 similar device put back what take out before flying youre too thrilled idea running down flight pack heres another approach Figure 3 shows Ace Sil ver Seven transmitter modified addi tion small RC receiver loudspeaker inside set could likewise Since have 5R900 battery pack trans mitter expanded-scale voltmeter front panel small current drawn monitoring no concern switch back transmitter selects either Monitor Transmitter function thought playing might plug receiver crystal monitor check channel before 138 Model Aviation RIC SCALE PLANS Curtlsn Hawk P44 60 apan 1500 aq I. lieu$3495 Aeronca Modal K-193731apan$1995 Piper Sup Cub Cnalnar PA-I 2 31 upas. S 1995 Piper Pacar PA-20 39 span Vs Scat$2995 Piper Trl-PncerPA-22 39 span V Scale 5 DH-85 Leopard Moth l11tpas /Scal#$1995 DH.80A Puns Moth ill apes VScaIe$1995 Sphsks Akronsa afar 60 spas Ill Scala$1495 Send SelfAddreaaed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident
Edition: Model Aviation - 1984/05
Page Numbers: 38, 39, 138, 139
Radio Technic George M Myers MONITORING RF environment Last month asked What will switchable-RF transmitter SRF shows up field know Ive just changed S synthesized switchable dont wony about Whats important fact switching its done month going look couple defense mechanisms first defense mechanism bell cat Figure 1 shows special flag SRF transmitters have proposed flag used identify such transmitters points out threat transmitter might switch frequency un mistakable way assume numbers will printed 10-page comic book would slip transparent plastic sleeve Therefore whenever owner switched channels would have to notify would turn some pages Everything stores transmitter Noth ing forgotten home work bench No problems pastel colors color-blind RCers proposal accepted may see 1984-85 AMA rule book several crashes 1983 Nats Since crashes seemed related Ii Jr Fl FD 41 RED RIBBON WHITE FiELDS BLACK NUMERALS 1 212H x 1W x ue jL 1/4 Stroke FIGURE 1 Remember good old days RC transmitters transmitted frequency Well times about endbecause new switchable-frequency SF sets about appear market George has proposed SF sets should have special frequency flaga red warn other fliers set capable being air channel owner such set would unable carry complete set tha color-coded flags anywayand could ever remember flag went channel SF transmitter would have carry complete set channel numbers slip frequency-flag windows though interference frequencies 72160 75640 MHz cry went up werent told about answer Nats Committee hn Lange 721 converter combined old automobile radio have capability monitor RC channelsas well Commercial Carriers between channels two sets owned AMA Bob Aberle photo again maybe could build monitor right transmitterlike George did Ace Silver Seven small RC receiver loudspeaker right inside case 38 Model Aviation cause didnt know about would suppose someone used monitor check such interference before fact Someone checked during problem Dan Kahn trapped interference 72160 75640 interference inter mittent youve got hap pens need proper tools detect set up monitor 72-73 MHz band 75 World Engines Airtronics scanners flight line impound tables too close flight line much use beyond catching returned transmitter left ON weekends like precious wait week chance fly rains wife comes up some last-minute Honey dos car needs fixing kids want take somewhere friend wants something else Such things breed frus tration miss weekend flying dont miss few hours field miss least week because thats long will take next opportunity come around crash due interference lose week because have find time repairs before can look time fly Monitoring RF environ ment deducts flying time deduction greater time spent making repairs So arent people doing monitoring arent second defense mechanism monitor ing ways monitoring Figure 2 shows cheapest possible way Look folks order fly safely future some places its now youd better protect yourself monitoring what RC channel youre using George gave us information Bird Dog frequency monitoring system January 1982 issuenow hems latest low-priced modi fication Youll need cheap AM radio under $10 old servo cabie/connector set plug jack some wIre solder give usable dedicated frequency monitor Thems no good excuse failing monitor own frequencyl version Electronic Bird-dog Janu Continued page 138 May 1984 39 _ CHEAP AM RECEIVER TO RECEIVER 1 N I________________ EXCHANGE TWO WIRES ON THE EARPHONE JACK TO OBTAIN THE CIRCUIT SHOWN FIGURE 2 H) ) ) LISTEN TO WHAT YOUR AIRPLANE HEARS TUNE FOR BEST SOUND BY TWISTING THE OUTPUT ARM 1 REMOVE SERVO MOTOR SERVO PLUGSERVO2 INSTALL EARPHONE YOUR RECEIVERCABLE IN ITS PLACE 3 DISREGARD WIRE SOLDER ED TO THESERVO MOTOR SHELL ITS GROUND WIRECLIP IT / Heres Radio Shack programmable scanner built Australian market Jack Aibrecht bought AMA business trip Australia can monitor US RC channels Bill Hershberger made some minor modifications Improve little Photo Aberie AMA past-president Walt Good sent us photo classy frequency control board used club Florida colored frequency-flag miniatures have clipped AMA New Frequency centerfold published Febmary 1983 issue Copies centerfold available request PR Dept AMA HO Pieces 1M plywood glued transmitter pins clipped-out miniature channel flags glued ply ILZUZL a/c 361 Iso RoadSan Antonio TX 73216 512 414712 FUTABA 7FGKFM23395 6FGK FMSOLD OUT 7FGK18495 6FGK16495 5FGK15495 6FG15495 4FG14995 4L3-5/2810495 2F2/S-28-R4H7495 S-28SERVO1895 5-32SERVO2595 COVERINGS Monokote Opaque 3 Rolls1695 Monokoge Trans. 3 Rolls1695 Monokote Met. 3 Rolls2095 CYANOACRYLATE Hot Stuff HS-t e169 Itol Stuff HSTl /z Ounce169 Hot Stuff HS-4 2 Ounce589 Hot Stuff HST-4 2 Ounce539 Slot Shot245 Jet Ouncet79 Super Jet e179 Jet 2 Ounce599 Super Jet 2 Ounce599 EPOXY GLUE Deveon 30 Minute 9 Ounce595 Devrou 5 Minute 9 Ounce595 Hobbypoxy 113 Ounce359 tiobbypoxy IV 3 Ounce559 Hobbypoxy III 3 Ounce295 SULLIVAN HT #600 Starter2795 HTD #601 Starter3095 HTD24 #602 Starter3295 PLEASE NOTE Prices subject change manufacturers prices change items subject availability time sale Prices effect until next Model Aviation Issue Show room prices may slightly higher Visit show room San Antonio jW discount price list refunded first order Shipping& Handling Prepaid orders S300 COD Credit Card orders 5595 Overseas orders add estimated shipping 25% deposit re4uired first lime COD 55% sates tax required Texas residents Personal checks delay shipping 15 days Cavalier/Laycock Continued oaae 135 hole get below engine mount better have too much paint enough ready cover fuselage now time add main landing gear After covering add tail wheel assembly wing tail hold-down dowels tray method radio installation has worked fine Use epoxy mount tray Incidentally tray strengthens center fuselage sure about getting center gravity CG lo cated correctly install radio tray last move fore aft get proper balance position Wing Once ribs cut wing panels assemble quite fast Incidentally four ribs can cut 3 x 36-in sheet made rib template As ply splicing two pieces together make big enough piece Build wing half flat plan Before joining two wing halves com plete wing tips easier work just half wing number ways join wing halves have favorite means go ahead use method works well follows As build wing half trim spars leading trailing edges correct length dihedral angle dihedral angle template very useful worth effort necessary make Build both wing halves add Vs-in center rib wing half Blockup half bring two halves together check fit satisfied glue epoxy Now have complete wing needing dihedral reinforcing Carefully slot center ribs dihedral braces Glue epoxy clamp place Finally add shear webs wing ready final sanding Tail Construction straightforward Square ends crosspieces sanding block careful cutting slots hinges Unless hinge pins exactly line will take extra force move control surface putting extra load radio servo battery Whether make tail assembly remov able epoxy permanently fuselage usually depends space ve hicle mid-sized two-door Ameri can car can carry wing inside pas senger area fuselage removable tail carried trunk transporta tion permits one-piece fuselage tail build wayyoull save yourself some extra work Finishing used translucent Super Mono Kote looks great built-up fuselage also adds sense being light weight wing tail can covered two rolls pieces cut shown plan use method make Super MonoKote lap joint over wing rib dont shrink part until whole wing has covered Make sure lap joint well-sealed use regular house hold iron final shrinking trim around windows used /4-in pressure-sensitive tape After cover ing add tip skids wing horizon tal taildont fly holding wing down make six 10-in loops use 20 rubber -in rubber strip Flying will find Cavalier easy plane fly However havent flown multi-channel RC before suggest have qualified flier help during early flights Cavalier doesnt have vices Its likely ground-loop take off landing Basic commonsense rules apply take off make sure model heading directly wind important lightly-loaded models such Cavalier Landings fun final approach should directly wind Cut engine throttle idle Add up-elevator trim establish glide start flare-out model about six feet above ground Keep giving vp-elevator until touch-down stick should way back point As takeoff very little roll windy weather dont attempt taxiing Once model turned crosswind wind will tend flip over does very little damage modelthe wing strongbut does spoil otherwise good landing usually kill engine carry model back pits Have fun building flying Cavalier Its model pushing state art honest goodness fun flier Radio Technique/Myers Continued page 39 ary 1982 MA page 30 can used monitoring tool arent flying can go off flight line about 500 feet plug Bird-dog airplane turn ON try find out whats hap pening channel unit draws quite bit flight pack about 300 mA use Ace Fast Field Charger 34K40 similar device put back what take out before flying youre too thrilled idea running down flight pack heres another approach Figure 3 shows Ace Sil ver Seven transmitter modified addi tion small RC receiver loudspeaker inside set could likewise Since have 5R900 battery pack trans mitter expanded-scale voltmeter front panel small current drawn monitoring no concern switch back transmitter selects either Monitor Transmitter function thought playing might plug receiver crystal monitor check channel before 138 Model Aviation RIC SCALE PLANS Curtlsn Hawk P44 60 apan 1500 aq I. lieu$3495 Aeronca Modal K-193731apan$1995 Piper Sup Cub Cnalnar PA-I 2 31 upas. S 1995 Piper Pacar PA-20 39 span Vs Scat$2995 Piper Trl-PncerPA-22 39 span V Scale 5 DH-85 Leopard Moth l11tpas /Scal#$1995 DH.80A Puns Moth ill apes VScaIe$1995 Sphsks Akronsa afar 60 spas Ill Scala$1495 Send SelfAddreaaed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident
Edition: Model Aviation - 1984/05
Page Numbers: 38, 39, 138, 139
Radio Technic George M Myers MONITORING RF environment Last month asked What will switchable-RF transmitter SRF shows up field know Ive just changed S synthesized switchable dont wony about Whats important fact switching its done month going look couple defense mechanisms first defense mechanism bell cat Figure 1 shows special flag SRF transmitters have proposed flag used identify such transmitters points out threat transmitter might switch frequency un mistakable way assume numbers will printed 10-page comic book would slip transparent plastic sleeve Therefore whenever owner switched channels would have to notify would turn some pages Everything stores transmitter Noth ing forgotten home work bench No problems pastel colors color-blind RCers proposal accepted may see 1984-85 AMA rule book several crashes 1983 Nats Since crashes seemed related Ii Jr Fl FD 41 RED RIBBON WHITE FiELDS BLACK NUMERALS 1 212H x 1W x ue jL 1/4 Stroke FIGURE 1 Remember good old days RC transmitters transmitted frequency Well times about endbecause new switchable-frequency SF sets about appear market George has proposed SF sets should have special frequency flaga red warn other fliers set capable being air channel owner such set would unable carry complete set tha color-coded flags anywayand could ever remember flag went channel SF transmitter would have carry complete set channel numbers slip frequency-flag windows though interference frequencies 72160 75640 MHz cry went up werent told about answer Nats Committee hn Lange 721 converter combined old automobile radio have capability monitor RC channelsas well Commercial Carriers between channels two sets owned AMA Bob Aberle photo again maybe could build monitor right transmitterlike George did Ace Silver Seven small RC receiver loudspeaker right inside case 38 Model Aviation cause didnt know about would suppose someone used monitor check such interference before fact Someone checked during problem Dan Kahn trapped interference 72160 75640 interference inter mittent youve got hap pens need proper tools detect set up monitor 72-73 MHz band 75 World Engines Airtronics scanners flight line impound tables too close flight line much use beyond catching returned transmitter left ON weekends like precious wait week chance fly rains wife comes up some last-minute Honey dos car needs fixing kids want take somewhere friend wants something else Such things breed frus tration miss weekend flying dont miss few hours field miss least week because thats long will take next opportunity come around crash due interference lose week because have find time repairs before can look time fly Monitoring RF environ ment deducts flying time deduction greater time spent making repairs So arent people doing monitoring arent second defense mechanism monitor ing ways monitoring Figure 2 shows cheapest possible way Look folks order fly safely future some places its now youd better protect yourself monitoring what RC channel youre using George gave us information Bird Dog frequency monitoring system January 1982 issuenow hems latest low-priced modi fication Youll need cheap AM radio under $10 old servo cabie/connector set plug jack some wIre solder give usable dedicated frequency monitor Thems no good excuse failing monitor own frequencyl version Electronic Bird-dog Janu Continued page 138 May 1984 39 _ CHEAP AM RECEIVER TO RECEIVER 1 N I________________ EXCHANGE TWO WIRES ON THE EARPHONE JACK TO OBTAIN THE CIRCUIT SHOWN FIGURE 2 H) ) ) LISTEN TO WHAT YOUR AIRPLANE HEARS TUNE FOR BEST SOUND BY TWISTING THE OUTPUT ARM 1 REMOVE SERVO MOTOR SERVO PLUGSERVO2 INSTALL EARPHONE YOUR RECEIVERCABLE IN ITS PLACE 3 DISREGARD WIRE SOLDER ED TO THESERVO MOTOR SHELL ITS GROUND WIRECLIP IT / Heres Radio Shack programmable scanner built Australian market Jack Aibrecht bought AMA business trip Australia can monitor US RC channels Bill Hershberger made some minor modifications Improve little Photo Aberie AMA past-president Walt Good sent us photo classy frequency control board used club Florida colored frequency-flag miniatures have clipped AMA New Frequency centerfold published Febmary 1983 issue Copies centerfold available request PR Dept AMA HO Pieces 1M plywood glued transmitter pins clipped-out miniature channel flags glued ply ILZUZL a/c 361 Iso RoadSan Antonio TX 73216 512 414712 FUTABA 7FGKFM23395 6FGK FMSOLD OUT 7FGK18495 6FGK16495 5FGK15495 6FG15495 4FG14995 4L3-5/2810495 2F2/S-28-R4H7495 S-28SERVO1895 5-32SERVO2595 COVERINGS Monokote Opaque 3 Rolls1695 Monokoge Trans. 3 Rolls1695 Monokote Met. 3 Rolls2095 CYANOACRYLATE Hot Stuff HS-t e169 Itol Stuff HSTl /z Ounce169 Hot Stuff HS-4 2 Ounce589 Hot Stuff HST-4 2 Ounce539 Slot Shot245 Jet Ouncet79 Super Jet e179 Jet 2 Ounce599 Super Jet 2 Ounce599 EPOXY GLUE Deveon 30 Minute 9 Ounce595 Devrou 5 Minute 9 Ounce595 Hobbypoxy 113 Ounce359 tiobbypoxy IV 3 Ounce559 Hobbypoxy III 3 Ounce295 SULLIVAN HT #600 Starter2795 HTD #601 Starter3095 HTD24 #602 Starter3295 PLEASE NOTE Prices subject change manufacturers prices change items subject availability time sale Prices effect until next Model Aviation Issue Show room prices may slightly higher Visit show room San Antonio jW discount price list refunded first order Shipping& Handling Prepaid orders S300 COD Credit Card orders 5595 Overseas orders add estimated shipping 25% deposit re4uired first lime COD 55% sates tax required Texas residents Personal checks delay shipping 15 days Cavalier/Laycock Continued oaae 135 hole get below engine mount better have too much paint enough ready cover fuselage now time add main landing gear After covering add tail wheel assembly wing tail hold-down dowels tray method radio installation has worked fine Use epoxy mount tray Incidentally tray strengthens center fuselage sure about getting center gravity CG lo cated correctly install radio tray last move fore aft get proper balance position Wing Once ribs cut wing panels assemble quite fast Incidentally four ribs can cut 3 x 36-in sheet made rib template As ply splicing two pieces together make big enough piece Build wing half flat plan Before joining two wing halves com plete wing tips easier work just half wing number ways join wing halves have favorite means go ahead use method works well follows As build wing half trim spars leading trailing edges correct length dihedral angle dihedral angle template very useful worth effort necessary make Build both wing halves add Vs-in center rib wing half Blockup half bring two halves together check fit satisfied glue epoxy Now have complete wing needing dihedral reinforcing Carefully slot center ribs dihedral braces Glue epoxy clamp place Finally add shear webs wing ready final sanding Tail Construction straightforward Square ends crosspieces sanding block careful cutting slots hinges Unless hinge pins exactly line will take extra force move control surface putting extra load radio servo battery Whether make tail assembly remov able epoxy permanently fuselage usually depends space ve hicle mid-sized two-door Ameri can car can carry wing inside pas senger area fuselage removable tail carried trunk transporta tion permits one-piece fuselage tail build wayyoull save yourself some extra work Finishing used translucent Super Mono Kote looks great built-up fuselage also adds sense being light weight wing tail can covered two rolls pieces cut shown plan use method make Super MonoKote lap joint over wing rib dont shrink part until whole wing has covered Make sure lap joint well-sealed use regular house hold iron final shrinking trim around windows used /4-in pressure-sensitive tape After cover ing add tip skids wing horizon tal taildont fly holding wing down make six 10-in loops use 20 rubber -in rubber strip Flying will find Cavalier easy plane fly However havent flown multi-channel RC before suggest have qualified flier help during early flights Cavalier doesnt have vices Its likely ground-loop take off landing Basic commonsense rules apply take off make sure model heading directly wind important lightly-loaded models such Cavalier Landings fun final approach should directly wind Cut engine throttle idle Add up-elevator trim establish glide start flare-out model about six feet above ground Keep giving vp-elevator until touch-down stick should way back point As takeoff very little roll windy weather dont attempt taxiing Once model turned crosswind wind will tend flip over does very little damage modelthe wing strongbut does spoil otherwise good landing usually kill engine carry model back pits Have fun building flying Cavalier Its model pushing state art honest goodness fun flier Radio Technique/Myers Continued page 39 ary 1982 MA page 30 can used monitoring tool arent flying can go off flight line about 500 feet plug Bird-dog airplane turn ON try find out whats hap pening channel unit draws quite bit flight pack about 300 mA use Ace Fast Field Charger 34K40 similar device put back what take out before flying youre too thrilled idea running down flight pack heres another approach Figure 3 shows Ace Sil ver Seven transmitter modified addi tion small RC receiver loudspeaker inside set could likewise Since have 5R900 battery pack trans mitter expanded-scale voltmeter front panel small current drawn monitoring no concern switch back transmitter selects either Monitor Transmitter function thought playing might plug receiver crystal monitor check channel before 138 Model Aviation RIC SCALE PLANS Curtlsn Hawk P44 60 apan 1500 aq I. lieu$3495 Aeronca Modal K-193731apan$1995 Piper Sup Cub Cnalnar PA-I 2 31 upas. S 1995 Piper Pacar PA-20 39 span Vs Scat$2995 Piper Trl-PncerPA-22 39 span V Scale 5 DH-85 Leopard Moth l11tpas /Scal#$1995 DH.80A Puns Moth ill apes VScaIe$1995 Sphsks Akronsa afar 60 spas Ill Scala$1495 Send SelfAddreaaed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident
Edition: Model Aviation - 1984/05
Page Numbers: 38, 39, 138, 139
Radio Technic George M Myers MONITORING RF environment Last month asked What will switchable-RF transmitter SRF shows up field know Ive just changed S synthesized switchable dont wony about Whats important fact switching its done month going look couple defense mechanisms first defense mechanism bell cat Figure 1 shows special flag SRF transmitters have proposed flag used identify such transmitters points out threat transmitter might switch frequency un mistakable way assume numbers will printed 10-page comic book would slip transparent plastic sleeve Therefore whenever owner switched channels would have to notify would turn some pages Everything stores transmitter Noth ing forgotten home work bench No problems pastel colors color-blind RCers proposal accepted may see 1984-85 AMA rule book several crashes 1983 Nats Since crashes seemed related Ii Jr Fl FD 41 RED RIBBON WHITE FiELDS BLACK NUMERALS 1 212H x 1W x ue jL 1/4 Stroke FIGURE 1 Remember good old days RC transmitters transmitted frequency Well times about endbecause new switchable-frequency SF sets about appear market George has proposed SF sets should have special frequency flaga red warn other fliers set capable being air channel owner such set would unable carry complete set tha color-coded flags anywayand could ever remember flag went channel SF transmitter would have carry complete set channel numbers slip frequency-flag windows though interference frequencies 72160 75640 MHz cry went up werent told about answer Nats Committee hn Lange 721 converter combined old automobile radio have capability monitor RC channelsas well Commercial Carriers between channels two sets owned AMA Bob Aberle photo again maybe could build monitor right transmitterlike George did Ace Silver Seven small RC receiver loudspeaker right inside case 38 Model Aviation cause didnt know about would suppose someone used monitor check such interference before fact Someone checked during problem Dan Kahn trapped interference 72160 75640 interference inter mittent youve got hap pens need proper tools detect set up monitor 72-73 MHz band 75 World Engines Airtronics scanners flight line impound tables too close flight line much use beyond catching returned transmitter left ON weekends like precious wait week chance fly rains wife comes up some last-minute Honey dos car needs fixing kids want take somewhere friend wants something else Such things breed frus tration miss weekend flying dont miss few hours field miss least week because thats long will take next opportunity come around crash due interference lose week because have find time repairs before can look time fly Monitoring RF environ ment deducts flying time deduction greater time spent making repairs So arent people doing monitoring arent second defense mechanism monitor ing ways monitoring Figure 2 shows cheapest possible way Look folks order fly safely future some places its now youd better protect yourself monitoring what RC channel youre using George gave us information Bird Dog frequency monitoring system January 1982 issuenow hems latest low-priced modi fication Youll need cheap AM radio under $10 old servo cabie/connector set plug jack some wIre solder give usable dedicated frequency monitor Thems no good excuse failing monitor own frequencyl version Electronic Bird-dog Janu Continued page 138 May 1984 39 _ CHEAP AM RECEIVER TO RECEIVER 1 N I________________ EXCHANGE TWO WIRES ON THE EARPHONE JACK TO OBTAIN THE CIRCUIT SHOWN FIGURE 2 H) ) ) LISTEN TO WHAT YOUR AIRPLANE HEARS TUNE FOR BEST SOUND BY TWISTING THE OUTPUT ARM 1 REMOVE SERVO MOTOR SERVO PLUGSERVO2 INSTALL EARPHONE YOUR RECEIVERCABLE IN ITS PLACE 3 DISREGARD WIRE SOLDER ED TO THESERVO MOTOR SHELL ITS GROUND WIRECLIP IT / Heres Radio Shack programmable scanner built Australian market Jack Aibrecht bought AMA business trip Australia can monitor US RC channels Bill Hershberger made some minor modifications Improve little Photo Aberie AMA past-president Walt Good sent us photo classy frequency control board used club Florida colored frequency-flag miniatures have clipped AMA New Frequency centerfold published Febmary 1983 issue Copies centerfold available request PR Dept AMA HO Pieces 1M plywood glued transmitter pins clipped-out miniature channel flags glued ply ILZUZL a/c 361 Iso RoadSan Antonio TX 73216 512 414712 FUTABA 7FGKFM23395 6FGK FMSOLD OUT 7FGK18495 6FGK16495 5FGK15495 6FG15495 4FG14995 4L3-5/2810495 2F2/S-28-R4H7495 S-28SERVO1895 5-32SERVO2595 COVERINGS Monokote Opaque 3 Rolls1695 Monokoge Trans. 3 Rolls1695 Monokote Met. 3 Rolls2095 CYANOACRYLATE Hot Stuff HS-t e169 Itol Stuff HSTl /z Ounce169 Hot Stuff HS-4 2 Ounce589 Hot Stuff HST-4 2 Ounce539 Slot Shot245 Jet Ouncet79 Super Jet e179 Jet 2 Ounce599 Super Jet 2 Ounce599 EPOXY GLUE Deveon 30 Minute 9 Ounce595 Devrou 5 Minute 9 Ounce595 Hobbypoxy 113 Ounce359 tiobbypoxy IV 3 Ounce559 Hobbypoxy III 3 Ounce295 SULLIVAN HT #600 Starter2795 HTD #601 Starter3095 HTD24 #602 Starter3295 PLEASE NOTE Prices subject change manufacturers prices change items subject availability time sale Prices effect until next Model Aviation Issue Show room prices may slightly higher Visit show room San Antonio jW discount price list refunded first order Shipping& Handling Prepaid orders S300 COD Credit Card orders 5595 Overseas orders add estimated shipping 25% deposit re4uired first lime COD 55% sates tax required Texas residents Personal checks delay shipping 15 days Cavalier/Laycock Continued oaae 135 hole get below engine mount better have too much paint enough ready cover fuselage now time add main landing gear After covering add tail wheel assembly wing tail hold-down dowels tray method radio installation has worked fine Use epoxy mount tray Incidentally tray strengthens center fuselage sure about getting center gravity CG lo cated correctly install radio tray last move fore aft get proper balance position Wing Once ribs cut wing panels assemble quite fast Incidentally four ribs can cut 3 x 36-in sheet made rib template As ply splicing two pieces together make big enough piece Build wing half flat plan Before joining two wing halves com plete wing tips easier work just half wing number ways join wing halves have favorite means go ahead use method works well follows As build wing half trim spars leading trailing edges correct length dihedral angle dihedral angle template very useful worth effort necessary make Build both wing halves add Vs-in center rib wing half Blockup half bring two halves together check fit satisfied glue epoxy Now have complete wing needing dihedral reinforcing Carefully slot center ribs dihedral braces Glue epoxy clamp place Finally add shear webs wing ready final sanding Tail Construction straightforward Square ends crosspieces sanding block careful cutting slots hinges Unless hinge pins exactly line will take extra force move control surface putting extra load radio servo battery Whether make tail assembly remov able epoxy permanently fuselage usually depends space ve hicle mid-sized two-door Ameri can car can carry wing inside pas senger area fuselage removable tail carried trunk transporta tion permits one-piece fuselage tail build wayyoull save yourself some extra work Finishing used translucent Super Mono Kote looks great built-up fuselage also adds sense being light weight wing tail can covered two rolls pieces cut shown plan use method make Super MonoKote lap joint over wing rib dont shrink part until whole wing has covered Make sure lap joint well-sealed use regular house hold iron final shrinking trim around windows used /4-in pressure-sensitive tape After cover ing add tip skids wing horizon tal taildont fly holding wing down make six 10-in loops use 20 rubber -in rubber strip Flying will find Cavalier easy plane fly However havent flown multi-channel RC before suggest have qualified flier help during early flights Cavalier doesnt have vices Its likely ground-loop take off landing Basic commonsense rules apply take off make sure model heading directly wind important lightly-loaded models such Cavalier Landings fun final approach should directly wind Cut engine throttle idle Add up-elevator trim establish glide start flare-out model about six feet above ground Keep giving vp-elevator until touch-down stick should way back point As takeoff very little roll windy weather dont attempt taxiing Once model turned crosswind wind will tend flip over does very little damage modelthe wing strongbut does spoil otherwise good landing usually kill engine carry model back pits Have fun building flying Cavalier Its model pushing state art honest goodness fun flier Radio Technique/Myers Continued page 39 ary 1982 MA page 30 can used monitoring tool arent flying can go off flight line about 500 feet plug Bird-dog airplane turn ON try find out whats hap pening channel unit draws quite bit flight pack about 300 mA use Ace Fast Field Charger 34K40 similar device put back what take out before flying youre too thrilled idea running down flight pack heres another approach Figure 3 shows Ace Sil ver Seven transmitter modified addi tion small RC receiver loudspeaker inside set could likewise Since have 5R900 battery pack trans mitter expanded-scale voltmeter front panel small current drawn monitoring no concern switch back transmitter selects either Monitor Transmitter function thought playing might plug receiver crystal monitor check channel before 138 Model Aviation RIC SCALE PLANS Curtlsn Hawk P44 60 apan 1500 aq I. lieu$3495 Aeronca Modal K-193731apan$1995 Piper Sup Cub Cnalnar PA-I 2 31 upas. S 1995 Piper Pacar PA-20 39 span Vs Scat$2995 Piper Trl-PncerPA-22 39 span V Scale 5 DH-85 Leopard Moth l11tpas /Scal#$1995 DH.80A Puns Moth ill apes VScaIe$1995 Sphsks Akronsa afar 60 spas Ill Scala$1495 Send SelfAddreaaed Stamped Envelope Complete List HOBBY CAPITOL RIC 46 N Oak St. Ventura CA 93001 24 insignia sheets also letters numbers 0 niajordecals available popular 40 -60 sizes plus American Giant Scale size believe majordeC8I5 have comprehensive assortment available now -with sizes styles coming time pressure sensitive water transfer WellbetthlslsOflellfle handing line.the complete line decals available model anywhere OCAG l love being handed major decals Os buos nqu es nv ed TEL 413 525 4110 CONTACT YOUR LOCAL HOBBY SHOP OR WRITE OIREIZT NORTHEAST SCREEN CRAPHICS 21 FISHER AVE. EAST LOOGMEADOW MA 01028 plugging airplane fly course youd need system inter changeable receiver crystals sides flying buddies might like thought youll have transmitter out impound area youre using fly could lead next solu tion still expensive Figure 4 shows 721 converter sold John Lange fully described construction article Receiving Converters RC Frequencies Model Aviation Feb ruary 1982 page 36 et seq John has sev eral versions item available might want contact him 1700 N 37th Ave Stone Park IL 60165 As know have attached discarded automobile radio use lot advantage rig can tune between RC channels thereby letting hear Com mercial Carrier stations live great help identifying inter ference sources John Lange DFC-at-large has donated couple built-up units AMA use AMA-sponsored contests have added some tape recordings ex plain use give exam ples kinds things might hear rapid education persons might use Figure 5 shows programmable scanner made Australian market scans new RC channels Jack Albrecht bought AMA trip ll Hershberger did some work improve little Both men members AMA frequency committee arent tunate have right kind men job unit kept AMA HQ used needed AMA competitions tape recording unit well Ive heard rumors Bearcat manu facturers scanners virtually thing considering making similar unit available US write ask may sooner George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 Four-Cycle/Randolph Continued DaGe 42 Four-cycle engines have crankcase breathers As piston goes up down cylinder air must come go out crankcase breather provided al low action pressure tap tightly-cowled engine installation should vented outside squirt oil breather after flying session gives shaft bearings good lubrication ability turn larger efficient pro pellers reasonable speed tends offset somewhat less power developed four-cycle compared faster-revving two-stroker example 40 four-cycle easily turns 12-6 prop 8500 9000 rpm ability should especially appeal fly Scale airplanes large radial cowls summary state-of-the-art now stands four-cycle engine produces about 75% much power same size twocycle does half fuel ear one-fourth much noise noise rumble rather whine Recommended additional reading Small Gas Engines Paul Weissler Harper & Row About Small Gas Engines Jud Purvis Goodheart-Wilcox Diesel & High Compression Gas Engine Fundamentals Edgar J Kates American Technical Society Internal Combustion Engine Works David Urquhart Henry Z Walck Inc writing advertisers mention read about Model Aviation LI _____COMPLETE THIS FORM t1JE4SUEA MAILING uj\E7.LABEL FROM RECENT LET US KNOW WHERE YOU ARE GOING move please let US know advanceSIX weeks required change address Attach current MA mailing label check appropriate box mail Subscrip tion Dept Model AviatIon 1810 Samuel Morse Dr Reston VA 22090 Check appropriate boxenclose payment C NEW SUBSCRIPTION U CHANGE OF ADDRESS Non-AMA subscription rates $1800 12 months US possessions eisewhere Including Canada Mexico $2400 US Schools $900 US Libraries $1350 NAME ADDRESS CITY/STATf _______________________________________________ ZIP ________________ MODEL AVIATION 1810 SAMUEL MORSE DR RESTON VA 22090 May1984 139 FLYING NEAR AIRPORTS BE CAREFUL PROTECT YOUR RIGHT TO FLY Safe Flying No Accident