Control Line AEROBA TICS Wynn Paul BACK business Now Nationals FAI team tryouts have come gone along outstanding flying bench-flying associated events Im going pick up left off October 1983 issue conclude series painting tips supplied Windy Urtnowski next years Nationals sup posed happen Reno NV high elevation enjoys high temperatures hangar-flying centered need creating special Nats-84 Stunt plane will have light light lightwith very powerful engine Some suggestions heard Build Gieseke Nobler ST 46 engine Build 650-sq-in Stunt plane cover silkspan forget finish put ST 60 OS Max 45 FSR hope 50 oz take three dozen different props Reno Well lets conclude Windys ideas thinking about High-Tech superlight Stunter 84 go Speaking making light finishes heres what Windy has say about paint covers airframe Dopes especially light colors cover poorly because pig ment materials 5% product Imron epoxy paints comparison 40-50% solid Its usually solid part material makes weight difference commonly associate epoxy finishes What means epoxy right very little material necessaryabout 10% what normally use dope cover same area order accomplish need super-good touch-up paint spray gun keep weight reasonable doesnt mean big spray gun expensive small automobile paint touch-up gun way also expensive touch-up gun gives better coverage applying material uniformly smaller droplets full-size guns Paint coverage less material possible high-quality touch-up gun Another thing can colored dope let can color settle let pigment settle Continued page 172 January 1984 73 Frank Williams Houston TX original Lone Star Stunter Its big modelspans 58 flies Supertigre 60 Closeup below shows details unique front end model Sullivan 8-oz slant clunk tank uses muffler pressure Prop Top Flite 14-6 cut 12-6 Open competitor 83 Nats Mrs Karen Meador Cedar Grove NJ flaw Gieseke Nobler kit-plane powered OS Max 35 FInish Aero Gloss husband Glen annual Top Twenty finisher Nats dont see lady contestants Encourage CESS Perhaps need something bit out-of-the ordinary scale competition Cessna 182 big stable airplane ideal scale trainer 40 engine Put 60 under cowl fly circles around competition semi-symmetrical airfoil makes 182 groove yet its docile kitten total scale realism add optional flaps Trike gear pleasant ground handling kit all-balsa lots hardware molded parts speedy construction clear plans special illustrated construction booklet make kit anyone can build Kit features Span 72 Area 702 Sq 5-7 lbs flying weight 4 channel Power 40 60 182 265 NE 88rS ee Main Fo da3380 Teepoone935 436 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE BROWNTEl CO A-23 PEANUT$2995STANDARD TELCO$2495 cAMPuS BEE$3495TURBO 3095 $3293 cAMPuS TWIN$5995TURBO 9000$3995 SODA CHARGER$1295 02 CONVERSiON TO CO-2$3995 NEW C4TAIOG No 25- $150 DnAhiA.. PHONE 91914424938 UWbflUVyfIUT 91914999970 W BOX 2498-MALA MESA CA 92041 cost sheet belicranks control handles now available write L-R Prod ucts Ltd 77-87 Archdale Ave Detroit MI 48228 Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Paul Continued oaoe 73 bottom pour off 10% clear off top will make 10% increase solid coverage will improved ac cordingly Caution dont pour off 10% will risk improper adhesion paint surface Windy has say about fillets feel Aero Gloss doesnt go well over fillets because high-shrink product shrinks Sig Randolph both relatively low-shrink dopes Aero Gloss part nitrate dope does adhere well also shrinks lot best both worlds low-shrink nitrate like Randolph fillet technique use tape HalfA prop leave fillets relatively rough would done last step after talc-filler sanded sealed coat clear Next step would air-brushing inch oversprayfive coats auto primer allowed dry hour between coats would sanded-in No 400 paper after coats have dried over night Fine grade 00 steel wool excellent sanding-in fillets youd like try something new use glovesthose splin ters awful' Miscellaneous comments include Low shrink dopes work well Nobler Juno types airframes have large areas silkspan ribs underneath Ran dolph Products puts out some good literature regarding combinations dope products PO Box 67 Carlstadt New Jersey 07072 dopes also come tinted help get coat over large surfaces mean translucent tracer-color clear nitrate butyrate dopes products available tint tint clear crystalclear best spray gun Ive found spraying DeVilbis touch-up gun available places sell auto body supplies will cost about $100 use number two tip about 40 lb air pressure spray Imron about 50 lb pressure spray dope Thinner comes grades expensive called slow rich pen etrating thinner recommended except clean gun Fast non penetrating thinner what wantyou will use thinner mix will loosen paint spraying over DuPont 3608 S good fast thinner Fast thinner cheaper really works best airplanesand wont melt canopies found out hard way conclude basic facts about various types paint characteris tics Imron goes over anything use cheap est lacquer thinner available spray 50 lb let cure eight hours tack total 24 hours Sig Randolph dopes will go over auto primer 2 nitrate 3 Aero Gloss 4 other butyrates 5 acrylics use Randolph dope thinner Sig thinner spray 35-45 lb let dry four hours Randolph nitrate dope will go over bare wood Epoxolite use Randolph dope thinner Sig thinner brush thinned 50% solution let dry hour Aero Gloss suggested cover over Aero Gloss use Aero Gloss thinner spray 35-45 lb let dry four hours normally Acrylic lacquers will go over 1 auto primer 2 nitrate dopes 3 Aero Gloss dope 4 butyrate dopes use rich lacquer thin ner colors cheap thinner clear spray 50 lb let dry least hour Epoxy paints like Hobbypoxy generally will go over dope Imron acrylic paint use special Hobbypoxy thinner spray 50-60 lb let dry eight hours full day Generally speaking about item Windys discourse some modelers may take issue dislike using Aero Gloss clear fillets bare wood 172 Model Aviation INTRODUCING THE NEW FOX 29 BB Bore732 Stroke715 Displacement299 RPM 9-B prop .. 14000 WeIght9 os Fuel Consumption 5 Os mm Fox Schneurle 29 brand new replacement popular Baffle 29 todays modern technology latest model Fox 29 produces half again power older 29 does little no nitro new 29 interchangeable earlier model Fox 29s Isnt time trust model powerful new Fox engine 23000 Fox 29BBBC Schneurle$5995 13000 Fox 29BBCL Schneurle4495 90236 Tilt-up Muffler1495 90237 TiltDown Muffler1495 FOX MFG CO 5305 TOWS0N AVE F09T SMITH ARK 72901 Hot tine 15011 6461656 know builders insist using Aero Gloss fillets first adding other clear instance Stan Pow ell recent Model Aviation Dove con struction article September 1983 advises using Aero Gloss over fillets switching Sig Lite-Coat clear rest plane Whatever remember Windy states no magic sensible ways channel efforts experiments Nothing substitutes hard work attention detail magic could front row Stan Powell now well just have keep sanding rubbing away Again thanks Windys patience answering letters returned him clarification series have questions comments write him 9 Union Ave Little Ferry NJ 07643 201-440-0905 Wynn Paul 1640 Maywick Dr Lexing ton KY 40504 CL Navy Carrier/Perry Continued oaqe 74 Fuel Tanks common problem among Profile Carrier models tendency engine go lean acceleration rich once airborne problem achieving good engine performance both during takeoff in-flight pro nounced larger venturi intake areas Some modelers have resorted partially closing throttle takeoff opening once airplane airborne Consistent per formance under conditions can hard achieve ideal situation would occur could set needle valve consistently ground say -turn open optimum first break hard two-cycle have engine lean out immediately upon release sagging hold optimum setting through acceleration high-speed flight Its impossible achieve type performance must use variation uniflow tank-venting scheme vent line should end near front tank reduce fuel pressure variations during acceleration should also outboard needle valve achieve good mixture both acceleration high-speed flight vent should end point below carburetorto prevent fuel siphoning through carb before engine started two drawings illustrate tanks used Carl T Tom Schaefer Nats Profile Carrier Open winner airplanes Toms tank little harder adjust doesnt require hole through fuselage vent line tune model high-speed flight first determine needle valve setting richer optimum easily repeatable engine should go good mixture airplane begins move takeoff should go over-lean engine leans out sags must find richer setting move vent tube lower tank next step set in-flight mixture adjusting vent engine too lean can Start richer mixture ground 2 Tilt external vent end pointed directly airstream 3 Move tank internal end vent line entire fuel tank inboard engine too rich flight can Start leaner setting sure engine wont sag takeoff 2 Bend cut external vent pointed less square ly airstream start 450 go 600 900 required 3 Move tank internal end vent line entire fuel tank outboard case moving position vent line relative needle valve will have greatest effect whether accomplished moving vent within tank moving tank itself sure start takeoff full tank duplicate competition conditions following procedure engine can set little rich ground can made perform well throughout takeoff high-speed flight Richard L Perry 7578 Vogels Way Springfield VA 22153 SAFE FLYING IS NO ACCIDENT January 1984 173
Edition: Model Aviation - 1984/01
Page Numbers: 73, 172, 173
Control Line AEROBA TICS Wynn Paul BACK business Now Nationals FAI team tryouts have come gone along outstanding flying bench-flying associated events Im going pick up left off October 1983 issue conclude series painting tips supplied Windy Urtnowski next years Nationals sup posed happen Reno NV high elevation enjoys high temperatures hangar-flying centered need creating special Nats-84 Stunt plane will have light light lightwith very powerful engine Some suggestions heard Build Gieseke Nobler ST 46 engine Build 650-sq-in Stunt plane cover silkspan forget finish put ST 60 OS Max 45 FSR hope 50 oz take three dozen different props Reno Well lets conclude Windys ideas thinking about High-Tech superlight Stunter 84 go Speaking making light finishes heres what Windy has say about paint covers airframe Dopes especially light colors cover poorly because pig ment materials 5% product Imron epoxy paints comparison 40-50% solid Its usually solid part material makes weight difference commonly associate epoxy finishes What means epoxy right very little material necessaryabout 10% what normally use dope cover same area order accomplish need super-good touch-up paint spray gun keep weight reasonable doesnt mean big spray gun expensive small automobile paint touch-up gun way also expensive touch-up gun gives better coverage applying material uniformly smaller droplets full-size guns Paint coverage less material possible high-quality touch-up gun Another thing can colored dope let can color settle let pigment settle Continued page 172 January 1984 73 Frank Williams Houston TX original Lone Star Stunter Its big modelspans 58 flies Supertigre 60 Closeup below shows details unique front end model Sullivan 8-oz slant clunk tank uses muffler pressure Prop Top Flite 14-6 cut 12-6 Open competitor 83 Nats Mrs Karen Meador Cedar Grove NJ flaw Gieseke Nobler kit-plane powered OS Max 35 FInish Aero Gloss husband Glen annual Top Twenty finisher Nats dont see lady contestants Encourage CESS Perhaps need something bit out-of-the ordinary scale competition Cessna 182 big stable airplane ideal scale trainer 40 engine Put 60 under cowl fly circles around competition semi-symmetrical airfoil makes 182 groove yet its docile kitten total scale realism add optional flaps Trike gear pleasant ground handling kit all-balsa lots hardware molded parts speedy construction clear plans special illustrated construction booklet make kit anyone can build Kit features Span 72 Area 702 Sq 5-7 lbs flying weight 4 channel Power 40 60 182 265 NE 88rS ee Main Fo da3380 Teepoone935 436 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE BROWNTEl CO A-23 PEANUT$2995STANDARD TELCO$2495 cAMPuS BEE$3495TURBO 3095 $3293 cAMPuS TWIN$5995TURBO 9000$3995 SODA CHARGER$1295 02 CONVERSiON TO CO-2$3995 NEW C4TAIOG No 25- $150 DnAhiA.. PHONE 91914424938 UWbflUVyfIUT 91914999970 W BOX 2498-MALA MESA CA 92041 cost sheet belicranks control handles now available write L-R Prod ucts Ltd 77-87 Archdale Ave Detroit MI 48228 Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Paul Continued oaoe 73 bottom pour off 10% clear off top will make 10% increase solid coverage will improved ac cordingly Caution dont pour off 10% will risk improper adhesion paint surface Windy has say about fillets feel Aero Gloss doesnt go well over fillets because high-shrink product shrinks Sig Randolph both relatively low-shrink dopes Aero Gloss part nitrate dope does adhere well also shrinks lot best both worlds low-shrink nitrate like Randolph fillet technique use tape HalfA prop leave fillets relatively rough would done last step after talc-filler sanded sealed coat clear Next step would air-brushing inch oversprayfive coats auto primer allowed dry hour between coats would sanded-in No 400 paper after coats have dried over night Fine grade 00 steel wool excellent sanding-in fillets youd like try something new use glovesthose splin ters awful' Miscellaneous comments include Low shrink dopes work well Nobler Juno types airframes have large areas silkspan ribs underneath Ran dolph Products puts out some good literature regarding combinations dope products PO Box 67 Carlstadt New Jersey 07072 dopes also come tinted help get coat over large surfaces mean translucent tracer-color clear nitrate butyrate dopes products available tint tint clear crystalclear best spray gun Ive found spraying DeVilbis touch-up gun available places sell auto body supplies will cost about $100 use number two tip about 40 lb air pressure spray Imron about 50 lb pressure spray dope Thinner comes grades expensive called slow rich pen etrating thinner recommended except clean gun Fast non penetrating thinner what wantyou will use thinner mix will loosen paint spraying over DuPont 3608 S good fast thinner Fast thinner cheaper really works best airplanesand wont melt canopies found out hard way conclude basic facts about various types paint characteris tics Imron goes over anything use cheap est lacquer thinner available spray 50 lb let cure eight hours tack total 24 hours Sig Randolph dopes will go over auto primer 2 nitrate 3 Aero Gloss 4 other butyrates 5 acrylics use Randolph dope thinner Sig thinner spray 35-45 lb let dry four hours Randolph nitrate dope will go over bare wood Epoxolite use Randolph dope thinner Sig thinner brush thinned 50% solution let dry hour Aero Gloss suggested cover over Aero Gloss use Aero Gloss thinner spray 35-45 lb let dry four hours normally Acrylic lacquers will go over 1 auto primer 2 nitrate dopes 3 Aero Gloss dope 4 butyrate dopes use rich lacquer thin ner colors cheap thinner clear spray 50 lb let dry least hour Epoxy paints like Hobbypoxy generally will go over dope Imron acrylic paint use special Hobbypoxy thinner spray 50-60 lb let dry eight hours full day Generally speaking about item Windys discourse some modelers may take issue dislike using Aero Gloss clear fillets bare wood 172 Model Aviation INTRODUCING THE NEW FOX 29 BB Bore732 Stroke715 Displacement299 RPM 9-B prop .. 14000 WeIght9 os Fuel Consumption 5 Os mm Fox Schneurle 29 brand new replacement popular Baffle 29 todays modern technology latest model Fox 29 produces half again power older 29 does little no nitro new 29 interchangeable earlier model Fox 29s Isnt time trust model powerful new Fox engine 23000 Fox 29BBBC Schneurle$5995 13000 Fox 29BBCL Schneurle4495 90236 Tilt-up Muffler1495 90237 TiltDown Muffler1495 FOX MFG CO 5305 TOWS0N AVE F09T SMITH ARK 72901 Hot tine 15011 6461656 know builders insist using Aero Gloss fillets first adding other clear instance Stan Pow ell recent Model Aviation Dove con struction article September 1983 advises using Aero Gloss over fillets switching Sig Lite-Coat clear rest plane Whatever remember Windy states no magic sensible ways channel efforts experiments Nothing substitutes hard work attention detail magic could front row Stan Powell now well just have keep sanding rubbing away Again thanks Windys patience answering letters returned him clarification series have questions comments write him 9 Union Ave Little Ferry NJ 07643 201-440-0905 Wynn Paul 1640 Maywick Dr Lexing ton KY 40504 CL Navy Carrier/Perry Continued oaqe 74 Fuel Tanks common problem among Profile Carrier models tendency engine go lean acceleration rich once airborne problem achieving good engine performance both during takeoff in-flight pro nounced larger venturi intake areas Some modelers have resorted partially closing throttle takeoff opening once airplane airborne Consistent per formance under conditions can hard achieve ideal situation would occur could set needle valve consistently ground say -turn open optimum first break hard two-cycle have engine lean out immediately upon release sagging hold optimum setting through acceleration high-speed flight Its impossible achieve type performance must use variation uniflow tank-venting scheme vent line should end near front tank reduce fuel pressure variations during acceleration should also outboard needle valve achieve good mixture both acceleration high-speed flight vent should end point below carburetorto prevent fuel siphoning through carb before engine started two drawings illustrate tanks used Carl T Tom Schaefer Nats Profile Carrier Open winner airplanes Toms tank little harder adjust doesnt require hole through fuselage vent line tune model high-speed flight first determine needle valve setting richer optimum easily repeatable engine should go good mixture airplane begins move takeoff should go over-lean engine leans out sags must find richer setting move vent tube lower tank next step set in-flight mixture adjusting vent engine too lean can Start richer mixture ground 2 Tilt external vent end pointed directly airstream 3 Move tank internal end vent line entire fuel tank inboard engine too rich flight can Start leaner setting sure engine wont sag takeoff 2 Bend cut external vent pointed less square ly airstream start 450 go 600 900 required 3 Move tank internal end vent line entire fuel tank outboard case moving position vent line relative needle valve will have greatest effect whether accomplished moving vent within tank moving tank itself sure start takeoff full tank duplicate competition conditions following procedure engine can set little rich ground can made perform well throughout takeoff high-speed flight Richard L Perry 7578 Vogels Way Springfield VA 22153 SAFE FLYING IS NO ACCIDENT January 1984 173
Edition: Model Aviation - 1984/01
Page Numbers: 73, 172, 173
Control Line AEROBA TICS Wynn Paul BACK business Now Nationals FAI team tryouts have come gone along outstanding flying bench-flying associated events Im going pick up left off October 1983 issue conclude series painting tips supplied Windy Urtnowski next years Nationals sup posed happen Reno NV high elevation enjoys high temperatures hangar-flying centered need creating special Nats-84 Stunt plane will have light light lightwith very powerful engine Some suggestions heard Build Gieseke Nobler ST 46 engine Build 650-sq-in Stunt plane cover silkspan forget finish put ST 60 OS Max 45 FSR hope 50 oz take three dozen different props Reno Well lets conclude Windys ideas thinking about High-Tech superlight Stunter 84 go Speaking making light finishes heres what Windy has say about paint covers airframe Dopes especially light colors cover poorly because pig ment materials 5% product Imron epoxy paints comparison 40-50% solid Its usually solid part material makes weight difference commonly associate epoxy finishes What means epoxy right very little material necessaryabout 10% what normally use dope cover same area order accomplish need super-good touch-up paint spray gun keep weight reasonable doesnt mean big spray gun expensive small automobile paint touch-up gun way also expensive touch-up gun gives better coverage applying material uniformly smaller droplets full-size guns Paint coverage less material possible high-quality touch-up gun Another thing can colored dope let can color settle let pigment settle Continued page 172 January 1984 73 Frank Williams Houston TX original Lone Star Stunter Its big modelspans 58 flies Supertigre 60 Closeup below shows details unique front end model Sullivan 8-oz slant clunk tank uses muffler pressure Prop Top Flite 14-6 cut 12-6 Open competitor 83 Nats Mrs Karen Meador Cedar Grove NJ flaw Gieseke Nobler kit-plane powered OS Max 35 FInish Aero Gloss husband Glen annual Top Twenty finisher Nats dont see lady contestants Encourage CESS Perhaps need something bit out-of-the ordinary scale competition Cessna 182 big stable airplane ideal scale trainer 40 engine Put 60 under cowl fly circles around competition semi-symmetrical airfoil makes 182 groove yet its docile kitten total scale realism add optional flaps Trike gear pleasant ground handling kit all-balsa lots hardware molded parts speedy construction clear plans special illustrated construction booklet make kit anyone can build Kit features Span 72 Area 702 Sq 5-7 lbs flying weight 4 channel Power 40 60 182 265 NE 88rS ee Main Fo da3380 Teepoone935 436 WE NOW HAVE COMPLETE LINE OF BROWN TELCO DAVIS CO-2 ENGINES INCLUDING SPARE PARTS SERVICE BROWNTEl CO A-23 PEANUT$2995STANDARD TELCO$2495 cAMPuS BEE$3495TURBO 3095 $3293 cAMPuS TWIN$5995TURBO 9000$3995 SODA CHARGER$1295 02 CONVERSiON TO CO-2$3995 NEW C4TAIOG No 25- $150 DnAhiA.. PHONE 91914424938 UWbflUVyfIUT 91914999970 W BOX 2498-MALA MESA CA 92041 cost sheet belicranks control handles now available write L-R Prod ucts Ltd 77-87 Archdale Ave Detroit MI 48228 Bill Boss 77-06 269th St New Hyde Park NY 11040 CL Aerobatics/Paul Continued oaoe 73 bottom pour off 10% clear off top will make 10% increase solid coverage will improved ac cordingly Caution dont pour off 10% will risk improper adhesion paint surface Windy has say about fillets feel Aero Gloss doesnt go well over fillets because high-shrink product shrinks Sig Randolph both relatively low-shrink dopes Aero Gloss part nitrate dope does adhere well also shrinks lot best both worlds low-shrink nitrate like Randolph fillet technique use tape HalfA prop leave fillets relatively rough would done last step after talc-filler sanded sealed coat clear Next step would air-brushing inch oversprayfive coats auto primer allowed dry hour between coats would sanded-in No 400 paper after coats have dried over night Fine grade 00 steel wool excellent sanding-in fillets youd like try something new use glovesthose splin ters awful' Miscellaneous comments include Low shrink dopes work well Nobler Juno types airframes have large areas silkspan ribs underneath Ran dolph Products puts out some good literature regarding combinations dope products PO Box 67 Carlstadt New Jersey 07072 dopes also come tinted help get coat over large surfaces mean translucent tracer-color clear nitrate butyrate dopes products available tint tint clear crystalclear best spray gun Ive found spraying DeVilbis touch-up gun available places sell auto body supplies will cost about $100 use number two tip about 40 lb air pressure spray Imron about 50 lb pressure spray dope Thinner comes grades expensive called slow rich pen etrating thinner recommended except clean gun Fast non penetrating thinner what wantyou will use thinner mix will loosen paint spraying over DuPont 3608 S good fast thinner Fast thinner cheaper really works best airplanesand wont melt canopies found out hard way conclude basic facts about various types paint characteris tics Imron goes over anything use cheap est lacquer thinner available spray 50 lb let cure eight hours tack total 24 hours Sig Randolph dopes will go over auto primer 2 nitrate 3 Aero Gloss 4 other butyrates 5 acrylics use Randolph dope thinner Sig thinner spray 35-45 lb let dry four hours Randolph nitrate dope will go over bare wood Epoxolite use Randolph dope thinner Sig thinner brush thinned 50% solution let dry hour Aero Gloss suggested cover over Aero Gloss use Aero Gloss thinner spray 35-45 lb let dry four hours normally Acrylic lacquers will go over 1 auto primer 2 nitrate dopes 3 Aero Gloss dope 4 butyrate dopes use rich lacquer thin ner colors cheap thinner clear spray 50 lb let dry least hour Epoxy paints like Hobbypoxy generally will go over dope Imron acrylic paint use special Hobbypoxy thinner spray 50-60 lb let dry eight hours full day Generally speaking about item Windys discourse some modelers may take issue dislike using Aero Gloss clear fillets bare wood 172 Model Aviation INTRODUCING THE NEW FOX 29 BB Bore732 Stroke715 Displacement299 RPM 9-B prop .. 14000 WeIght9 os Fuel Consumption 5 Os mm Fox Schneurle 29 brand new replacement popular Baffle 29 todays modern technology latest model Fox 29 produces half again power older 29 does little no nitro new 29 interchangeable earlier model Fox 29s Isnt time trust model powerful new Fox engine 23000 Fox 29BBBC Schneurle$5995 13000 Fox 29BBCL Schneurle4495 90236 Tilt-up Muffler1495 90237 TiltDown Muffler1495 FOX MFG CO 5305 TOWS0N AVE F09T SMITH ARK 72901 Hot tine 15011 6461656 know builders insist using Aero Gloss fillets first adding other clear instance Stan Pow ell recent Model Aviation Dove con struction article September 1983 advises using Aero Gloss over fillets switching Sig Lite-Coat clear rest plane Whatever remember Windy states no magic sensible ways channel efforts experiments Nothing substitutes hard work attention detail magic could front row Stan Powell now well just have keep sanding rubbing away Again thanks Windys patience answering letters returned him clarification series have questions comments write him 9 Union Ave Little Ferry NJ 07643 201-440-0905 Wynn Paul 1640 Maywick Dr Lexing ton KY 40504 CL Navy Carrier/Perry Continued oaqe 74 Fuel Tanks common problem among Profile Carrier models tendency engine go lean acceleration rich once airborne problem achieving good engine performance both during takeoff in-flight pro nounced larger venturi intake areas Some modelers have resorted partially closing throttle takeoff opening once airplane airborne Consistent per formance under conditions can hard achieve ideal situation would occur could set needle valve consistently ground say -turn open optimum first break hard two-cycle have engine lean out immediately upon release sagging hold optimum setting through acceleration high-speed flight Its impossible achieve type performance must use variation uniflow tank-venting scheme vent line should end near front tank reduce fuel pressure variations during acceleration should also outboard needle valve achieve good mixture both acceleration high-speed flight vent should end point below carburetorto prevent fuel siphoning through carb before engine started two drawings illustrate tanks used Carl T Tom Schaefer Nats Profile Carrier Open winner airplanes Toms tank little harder adjust doesnt require hole through fuselage vent line tune model high-speed flight first determine needle valve setting richer optimum easily repeatable engine should go good mixture airplane begins move takeoff should go over-lean engine leans out sags must find richer setting move vent tube lower tank next step set in-flight mixture adjusting vent engine too lean can Start richer mixture ground 2 Tilt external vent end pointed directly airstream 3 Move tank internal end vent line entire fuel tank inboard engine too rich flight can Start leaner setting sure engine wont sag takeoff 2 Bend cut external vent pointed less square ly airstream start 450 go 600 900 required 3 Move tank internal end vent line entire fuel tank outboard case moving position vent line relative needle valve will have greatest effect whether accomplished moving vent within tank moving tank itself sure start takeoff full tank duplicate competition conditions following procedure engine can set little rich ground can made perform well throughout takeoff high-speed flight Richard L Perry 7578 Vogels Way Springfield VA 22153 SAFE FLYING IS NO ACCIDENT January 1984 173