BACK spring 1954 Purdue University Engineering School learning about aeronautical engineering However time spent think ing about college looking forward flying first radio-controlled airplane deBolt Kitten purchased late previous summer mind lot during winter spring semesters finally flown successftilly summer Atwood 049 power radio system included ECE hard tube receiver homebuilt groundbased transmitter batteries escape ment Sigma 4F relay receiver airborne system weighed cur rent four-channel system single channel Regardless enjoyable flying session old Kitten subsequent years fly deBolt Sonic Cruiser Viscount designs todays RC modelers can also trace early flying enjoyment owning deBolt kit Thats gleam nostalgia came eyes Model Aviations editor Bill Winter sent letter Fran Ptaszkiewicz Fran has plans deBolts kits both RC Control Line airplanes offers send list receives stamped selfaddressed envelope Prices plans very reasonable Write Fran Ptaszkiewicz 23 Marler Drive Tonawanda NY 14150 way Fran looking copy Live Wire Senior plans According Fran Senior interim design between Live Wire Trainer Cruiser very built available copies plans master destroyed during fire Harold late 1950s have copy plans please write Fran let him know Pattern Problem Month submitted Major Dick Cline Sierra Vista AZ way Problem idea something add column first problem included last month Its up rest share want same Dicks problem follows have Hobby Barn Curare HP 61 has center-of-gravity front-to-back side-to-side about right Inside outside loops fine problem end third loop Im heading about 450 direction entry quite common problem ever several possible causes sometimes difficult correct able straighten loops out would probably see model turning continuously original heading means directional trim correct airplane skidding through air Among main causes type motion incorrect engine alignment installation vertical fin angle fuselage curved banana shaped fuselage asymmetric yawing effects mufflers pipes engine offset error usually difficult detect Probably best way find out whether contributing problem offset engine direction opposite way heading changing retrim ailerons rudder described last months column heading change loops reduced know engine offset problem can carry eliminate careful during vertical fin installation have fiberglass fuselage integral vertical fin probably have fin straight However weve probably vertical fin end up installed crooked balsa fuselage rudder can used trim out inherent yawing tendency crooked fin will Continued page 102 July 1979 23 varied flock airplanes appeared st Western Ohio Radio Kontrol Society WORKS Flying Circus sponsored annually club flying site near Dayton Photograph Chuck Shade trlars I~re3oun uuunI .ow Ip stop him flying RC airplanes assisted Mel Bray prepared special trans miller sticks Charlie grip Six pairs ayes watch maneuvers George Aibright fires up engine UtopiaUtopia Enterprises Co Completely prebuilt ready finish Earl Haury flies competition new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495 RUNNING RADIALS Aave erwded/ Worth waiting bet Low vibration-light weight-high torquesheer sculpture eye As cylinders come time youll know youre flying total scale its best Want com plete act Add custom designed on-board ignition system keeps glow plugs hot idle smooth scale-like landings SPECIFICATIONS 5cyl 7cyl Total diaplacenient1573cm3 196 cuin2213cm3 135 cuin Weight623 grams 22 oz 737 grams 26 oz Bore1587mm 625 in1587mm 625 Stroke16mm 630 16mm 630 Compression Ratio9 19 1 RPM1000-5000 10005000 Length1270cm 5 fromprop nut rear carbl Width15cm 6 Ret Prop Size16-818-6 GOLD PRESTIGE COLLECTORS EDITION _ HECUTIUE AGINES co 104th Ave Orland Perk Ill USA 60462 Area 312/349-1998 * Reserved Registered serial numbers * Fully Operational * Delux Packaging * Trimed 14K Gold Price- 5 cvi-- $79500 7 cyl . $89500 Direct Only y order bank draft certified check Clearance delay up three weeks personal checks Add $300 shipping handling insurance IL residents add 5% sales tax Foreign orders add 10% total UPS Air Service possible installations better others re ducing yaw effects Most aircraft designs appear best horizontally mounted engine coupled pipe passes under wing drag-induced yawing tendency seems less way wing installation removal complicated time next month hope have received suggestions Pattern Prob lem Month number receive will good indication level interest future idea As read Cincinnati Aero modelers will working hard lastminute preparations 1979 RC Mas ters Team Selection Finals will held June 2 324 Lakeport Airport near Celina OH just received press release AMA containing names 45 fliers have qualified program several new names scattered among old familiar ones will interesting see fare competition competitor wont have travel very far compete Fred Kugel lives Celina Several others will also come -from nearby include Don Lowe Dave Brown Tony Frackowiak Dean Koger guys really feel sorry competitors West South west like Joe Bridi Jim Kimbro Don Weitz Bill Thomas Nevertheless eligible competitors will hope Im too report what happens Several months ago wrote about tech nique use prepare fiberglasscloth-covered skins foam wings Appar ently lot confusion about indicated several recent conversations letters subject Perhaps would help went through time prepare wing skins using 1/16 X 3 balsa sheets because theyre cheaper skin will cover both top bottom wing panel skin very easy prepare rectangular wing tapered wing requires bit cutting fitting balsa sheets arranged center sheet parallel leading edge wing outside sheets parallel trailing edges sheets prepared fill open area course wing tapered some sheets will have cut angle fit adjoining edges sanded until fit perfectly use Hot Stuff Zap Jet other cyanoacrylate adhesives can used glue sheets together Work top non-stick surface like wax paper avoid sticking sheets whatever below Sand joint 280 grit sand paper block soon two pieces joined will literally make glue joint disappear wait until joints have made will visible After entire skin has prepared use orbital sander sand entire skin take out irregularities due variations sheet thickness lightweight fiberglass cloth applied wing skin before putting skin foam wing skin placed table has covered wax paper piece glass cloth cut slightly larger skin sandable epoxy like Southern R/G Products Epoxy Kit used stick cloth skin hold cloth over skin brush epoxy through cloth skin Small wrinkles easily removed pulling along edges cloth excess epoxy removed soaked up using roll toilet paper short piece broom handle As outer layer paper becomes soaked peeled off discarded Keep up process until no epoxy appears toilet paper Trim off excess glass cloth epoxy has cured skin applied foam wing glass cloth outside might surprised hear people werent sure glass cloth keeps balsa cracking skin rolled around wing leading edge After wing sections joined light sanding two coats good primer sanded between coats will make cloth weave disappear Try Ron Van Putte 12 Connie Drive Shal imar FL 32579 writing advertisers mention read about Model Aviation July1979 103 INTRODUCTORY PRICE 5 cyl price- -$68500 7 cvi price - $78500OPtlONA ONBOARD IGNITION Anodized Black - $ 5000 uding Fast Chorger54500
Edition: Model Aviation - 1979/07
Page Numbers: 23, 102, 103
BACK spring 1954 Purdue University Engineering School learning about aeronautical engineering However time spent think ing about college looking forward flying first radio-controlled airplane deBolt Kitten purchased late previous summer mind lot during winter spring semesters finally flown successftilly summer Atwood 049 power radio system included ECE hard tube receiver homebuilt groundbased transmitter batteries escape ment Sigma 4F relay receiver airborne system weighed cur rent four-channel system single channel Regardless enjoyable flying session old Kitten subsequent years fly deBolt Sonic Cruiser Viscount designs todays RC modelers can also trace early flying enjoyment owning deBolt kit Thats gleam nostalgia came eyes Model Aviations editor Bill Winter sent letter Fran Ptaszkiewicz Fran has plans deBolts kits both RC Control Line airplanes offers send list receives stamped selfaddressed envelope Prices plans very reasonable Write Fran Ptaszkiewicz 23 Marler Drive Tonawanda NY 14150 way Fran looking copy Live Wire Senior plans According Fran Senior interim design between Live Wire Trainer Cruiser very built available copies plans master destroyed during fire Harold late 1950s have copy plans please write Fran let him know Pattern Problem Month submitted Major Dick Cline Sierra Vista AZ way Problem idea something add column first problem included last month Its up rest share want same Dicks problem follows have Hobby Barn Curare HP 61 has center-of-gravity front-to-back side-to-side about right Inside outside loops fine problem end third loop Im heading about 450 direction entry quite common problem ever several possible causes sometimes difficult correct able straighten loops out would probably see model turning continuously original heading means directional trim correct airplane skidding through air Among main causes type motion incorrect engine alignment installation vertical fin angle fuselage curved banana shaped fuselage asymmetric yawing effects mufflers pipes engine offset error usually difficult detect Probably best way find out whether contributing problem offset engine direction opposite way heading changing retrim ailerons rudder described last months column heading change loops reduced know engine offset problem can carry eliminate careful during vertical fin installation have fiberglass fuselage integral vertical fin probably have fin straight However weve probably vertical fin end up installed crooked balsa fuselage rudder can used trim out inherent yawing tendency crooked fin will Continued page 102 July 1979 23 varied flock airplanes appeared st Western Ohio Radio Kontrol Society WORKS Flying Circus sponsored annually club flying site near Dayton Photograph Chuck Shade trlars I~re3oun uuunI .ow Ip stop him flying RC airplanes assisted Mel Bray prepared special trans miller sticks Charlie grip Six pairs ayes watch maneuvers George Aibright fires up engine UtopiaUtopia Enterprises Co Completely prebuilt ready finish Earl Haury flies competition new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495 RUNNING RADIALS Aave erwded/ Worth waiting bet Low vibration-light weight-high torquesheer sculpture eye As cylinders come time youll know youre flying total scale its best Want com plete act Add custom designed on-board ignition system keeps glow plugs hot idle smooth scale-like landings SPECIFICATIONS 5cyl 7cyl Total diaplacenient1573cm3 196 cuin2213cm3 135 cuin Weight623 grams 22 oz 737 grams 26 oz Bore1587mm 625 in1587mm 625 Stroke16mm 630 16mm 630 Compression Ratio9 19 1 RPM1000-5000 10005000 Length1270cm 5 fromprop nut rear carbl Width15cm 6 Ret Prop Size16-818-6 GOLD PRESTIGE COLLECTORS EDITION _ HECUTIUE AGINES co 104th Ave Orland Perk Ill USA 60462 Area 312/349-1998 * Reserved Registered serial numbers * Fully Operational * Delux Packaging * Trimed 14K Gold Price- 5 cvi-- $79500 7 cyl . $89500 Direct Only y order bank draft certified check Clearance delay up three weeks personal checks Add $300 shipping handling insurance IL residents add 5% sales tax Foreign orders add 10% total UPS Air Service possible installations better others re ducing yaw effects Most aircraft designs appear best horizontally mounted engine coupled pipe passes under wing drag-induced yawing tendency seems less way wing installation removal complicated time next month hope have received suggestions Pattern Prob lem Month number receive will good indication level interest future idea As read Cincinnati Aero modelers will working hard lastminute preparations 1979 RC Mas ters Team Selection Finals will held June 2 324 Lakeport Airport near Celina OH just received press release AMA containing names 45 fliers have qualified program several new names scattered among old familiar ones will interesting see fare competition competitor wont have travel very far compete Fred Kugel lives Celina Several others will also come -from nearby include Don Lowe Dave Brown Tony Frackowiak Dean Koger guys really feel sorry competitors West South west like Joe Bridi Jim Kimbro Don Weitz Bill Thomas Nevertheless eligible competitors will hope Im too report what happens Several months ago wrote about tech nique use prepare fiberglasscloth-covered skins foam wings Appar ently lot confusion about indicated several recent conversations letters subject Perhaps would help went through time prepare wing skins using 1/16 X 3 balsa sheets because theyre cheaper skin will cover both top bottom wing panel skin very easy prepare rectangular wing tapered wing requires bit cutting fitting balsa sheets arranged center sheet parallel leading edge wing outside sheets parallel trailing edges sheets prepared fill open area course wing tapered some sheets will have cut angle fit adjoining edges sanded until fit perfectly use Hot Stuff Zap Jet other cyanoacrylate adhesives can used glue sheets together Work top non-stick surface like wax paper avoid sticking sheets whatever below Sand joint 280 grit sand paper block soon two pieces joined will literally make glue joint disappear wait until joints have made will visible After entire skin has prepared use orbital sander sand entire skin take out irregularities due variations sheet thickness lightweight fiberglass cloth applied wing skin before putting skin foam wing skin placed table has covered wax paper piece glass cloth cut slightly larger skin sandable epoxy like Southern R/G Products Epoxy Kit used stick cloth skin hold cloth over skin brush epoxy through cloth skin Small wrinkles easily removed pulling along edges cloth excess epoxy removed soaked up using roll toilet paper short piece broom handle As outer layer paper becomes soaked peeled off discarded Keep up process until no epoxy appears toilet paper Trim off excess glass cloth epoxy has cured skin applied foam wing glass cloth outside might surprised hear people werent sure glass cloth keeps balsa cracking skin rolled around wing leading edge After wing sections joined light sanding two coats good primer sanded between coats will make cloth weave disappear Try Ron Van Putte 12 Connie Drive Shal imar FL 32579 writing advertisers mention read about Model Aviation July1979 103 INTRODUCTORY PRICE 5 cyl price- -$68500 7 cvi price - $78500OPtlONA ONBOARD IGNITION Anodized Black - $ 5000 uding Fast Chorger54500
Edition: Model Aviation - 1979/07
Page Numbers: 23, 102, 103
BACK spring 1954 Purdue University Engineering School learning about aeronautical engineering However time spent think ing about college looking forward flying first radio-controlled airplane deBolt Kitten purchased late previous summer mind lot during winter spring semesters finally flown successftilly summer Atwood 049 power radio system included ECE hard tube receiver homebuilt groundbased transmitter batteries escape ment Sigma 4F relay receiver airborne system weighed cur rent four-channel system single channel Regardless enjoyable flying session old Kitten subsequent years fly deBolt Sonic Cruiser Viscount designs todays RC modelers can also trace early flying enjoyment owning deBolt kit Thats gleam nostalgia came eyes Model Aviations editor Bill Winter sent letter Fran Ptaszkiewicz Fran has plans deBolts kits both RC Control Line airplanes offers send list receives stamped selfaddressed envelope Prices plans very reasonable Write Fran Ptaszkiewicz 23 Marler Drive Tonawanda NY 14150 way Fran looking copy Live Wire Senior plans According Fran Senior interim design between Live Wire Trainer Cruiser very built available copies plans master destroyed during fire Harold late 1950s have copy plans please write Fran let him know Pattern Problem Month submitted Major Dick Cline Sierra Vista AZ way Problem idea something add column first problem included last month Its up rest share want same Dicks problem follows have Hobby Barn Curare HP 61 has center-of-gravity front-to-back side-to-side about right Inside outside loops fine problem end third loop Im heading about 450 direction entry quite common problem ever several possible causes sometimes difficult correct able straighten loops out would probably see model turning continuously original heading means directional trim correct airplane skidding through air Among main causes type motion incorrect engine alignment installation vertical fin angle fuselage curved banana shaped fuselage asymmetric yawing effects mufflers pipes engine offset error usually difficult detect Probably best way find out whether contributing problem offset engine direction opposite way heading changing retrim ailerons rudder described last months column heading change loops reduced know engine offset problem can carry eliminate careful during vertical fin installation have fiberglass fuselage integral vertical fin probably have fin straight However weve probably vertical fin end up installed crooked balsa fuselage rudder can used trim out inherent yawing tendency crooked fin will Continued page 102 July 1979 23 varied flock airplanes appeared st Western Ohio Radio Kontrol Society WORKS Flying Circus sponsored annually club flying site near Dayton Photograph Chuck Shade trlars I~re3oun uuunI .ow Ip stop him flying RC airplanes assisted Mel Bray prepared special trans miller sticks Charlie grip Six pairs ayes watch maneuvers George Aibright fires up engine UtopiaUtopia Enterprises Co Completely prebuilt ready finish Earl Haury flies competition new releases Bucker ITT herb clukey wingspan Seagu 11for rubber available soon C02 power SEE YOURsend 25$ DEALER NOWcatalog FLYLINE MODELS INC 282000A53V55u5B PAISPAX VIRGINIA 2200TOOl 532030 cisely extend human arms legs senses man controls crate alivethe pilot its brain will build model Cubs forever Maybe Hazel Sigs Clipped-Wing Cubthe big flies typical air show ship others mind finest model Cubs classic sense 6-foot J-3 Chuck Hollinger appeared Air Trails during fifties kitted Berkeley Berkeley Fairchild low-wing trainer another Hollinger masterpiece Berkeley failed product line went Fox Sig Well bet Sig has some Hollinger J-3 plans barn about Sig Mac Mike Ah Cub-yellow Hollinger Cub What collectors item what bird model Cub captures essence real Cub its framing its flight stuff dreams made RC Technique/Myers continued page 19 about Lithium batteries ELTs know about should no trick make up similar system using nickle cadmium batteries important points 1 backup battery should have separate electrical path receiver avoid total failure broken wire 2 backup battery should operate simultaneously parallel ANNOUNCING Fast Steep Climb FLat Slow Glide 4 new P30 class model designed novice mind has potential win toughest THE POTENT30 Delece kit lectures include Rolled balsa fuselage wing mount dt Completed prop nose plug tail plugS rudder Precut wing ribs spar notches job rated balta strips Highest qualoty tossue lu bed Contest rubber Detailed instructoons flying tips help winl CAT NO R2 $695 PP check money Order CHAS WERLE 3620 MORSE AVE NOS SACTO CALIF 95821 primary battery backup battery idea should incor porated plane powered engine larger 049 larger heavier airplane important protection becomes wind blows dust eyes system fails club has few rules number 1 rule Buddy System Flying alone asking trouble Suppose have make landing cant see kid standing behind runway Does situation always leave enough time take eyes off plane quick look larger models certainly feasible use two parallel completely independent RC systems control No doubt will some complaints about Hogging Channels increased reliability will Mathematically operating two parallel systems 9 reliability system reli ability becomes 99 think unnecessarily high consider fact reliability goal Lunar Module 99999 try figure out achieved Well friends Ive run out column space before have run out ideas have read far consider call new ideas increased RC systms reli ability will publish far space permits credit presenting George Myers 70 Froehlich Farm Rd Hicksvile NY 11801 Ugly/Beckman continued page 22 epoxy use Tra-Bond 2248 made Tra Can Inc 55 North St Medford Mass 02155 can supply what call BIPAX premeasured amounts resin hardener single plastic bag separated plastic clip remove clip mix two parts cut off corner bag squeeze out epoxy Pot life three hours have plenty time assemble things must follow special curing schedule muffler parts fitted ready mix apply epoxy Put thin coat surfaces contact screws before install Run bead epoxy along seams joints epoxy thixotropic helps keep want it will thin out run bit during cure pile too thick Once everything except engine course together let sit room temper ature 700—750F 12 hours specs call two hours at650C two hours 900 C four hours 1 250C temper atures convert 1490F 1940F 2570F will lower end kitchen ovens range arent super critical get close can important shot pick time can tie up oven eight hours straight end result will muffler will hold together normal operating tem peratures engine warts will out sight RC Aerobatics/Van Putte continued page 23 cause during straight flight However air craft speed changes during loops will proba bly cause airplane yaw since correct rudder trim will vary airspeed Check alignment vertical fin fix misalignment discover prepared use rudder during loops correct heading tendency Fiberglass fuselages have gone long way toward elimination bananashaped fuselage curved fuselage causes side force generated after rudder adjusted trim out yawing tendency straight flight combination side force change correct rudder trim during loops causes airplane move sideways change heading Unfortunately elimination problem would require fuselage modification people willing perform alternative use rudder compensate yawing tendency vow build fuselage straight next time Most engine-muffler/pipe installations will cause yaw problems unless rear exhaust engine coupled tuned pipe installed fuselage used drag muffler/pipe causes yawing tendency aircraft Some pipe 102 Model Aviation ONLY LIGHiWEIGHTOUNCE SUPERPERSO FT / COVE RITE STRONGER BY FAR THAN ANY OTHER IRON ON RED WHITE BLUE YELLOW ORANGE ANTIQUE FABRIC COVERIT 420 Babylon Rd Horsham Pa 19044 great schoolyard scale TRAVEL AIR 6000 020 power 36span 12 channel RIC tree flight 51495 RUNNING RADIALS Aave erwded/ Worth waiting bet Low vibration-light weight-high torquesheer sculpture eye As cylinders come time youll know youre flying total scale its best Want com plete act Add custom designed on-board ignition system keeps glow plugs hot idle smooth scale-like landings SPECIFICATIONS 5cyl 7cyl Total diaplacenient1573cm3 196 cuin2213cm3 135 cuin Weight623 grams 22 oz 737 grams 26 oz Bore1587mm 625 in1587mm 625 Stroke16mm 630 16mm 630 Compression Ratio9 19 1 RPM1000-5000 10005000 Length1270cm 5 fromprop nut rear carbl Width15cm 6 Ret Prop Size16-818-6 GOLD PRESTIGE COLLECTORS EDITION _ HECUTIUE AGINES co 104th Ave Orland Perk Ill USA 60462 Area 312/349-1998 * Reserved Registered serial numbers * Fully Operational * Delux Packaging * Trimed 14K Gold Price- 5 cvi-- $79500 7 cyl . $89500 Direct Only y order bank draft certified check Clearance delay up three weeks personal checks Add $300 shipping handling insurance IL residents add 5% sales tax Foreign orders add 10% total UPS Air Service possible installations better others re ducing yaw effects Most aircraft designs appear best horizontally mounted engine coupled pipe passes under wing drag-induced yawing tendency seems less way wing installation removal complicated time next month hope have received suggestions Pattern Prob lem Month number receive will good indication level interest future idea As read Cincinnati Aero modelers will working hard lastminute preparations 1979 RC Mas ters Team Selection Finals will held June 2 324 Lakeport Airport near Celina OH just received press release AMA containing names 45 fliers have qualified program several new names scattered among old familiar ones will interesting see fare competition competitor wont have travel very far compete Fred Kugel lives Celina Several others will also come -from nearby include Don Lowe Dave Brown Tony Frackowiak Dean Koger guys really feel sorry competitors West South west like Joe Bridi Jim Kimbro Don Weitz Bill Thomas Nevertheless eligible competitors will hope Im too report what happens Several months ago wrote about tech nique use prepare fiberglasscloth-covered skins foam wings Appar ently lot confusion about indicated several recent conversations letters subject Perhaps would help went through time prepare wing skins using 1/16 X 3 balsa sheets because theyre cheaper skin will cover both top bottom wing panel skin very easy prepare rectangular wing tapered wing requires bit cutting fitting balsa sheets arranged center sheet parallel leading edge wing outside sheets parallel trailing edges sheets prepared fill open area course wing tapered some sheets will have cut angle fit adjoining edges sanded until fit perfectly use Hot Stuff Zap Jet other cyanoacrylate adhesives can used glue sheets together Work top non-stick surface like wax paper avoid sticking sheets whatever below Sand joint 280 grit sand paper block soon two pieces joined will literally make glue joint disappear wait until joints have made will visible After entire skin has prepared use orbital sander sand entire skin take out irregularities due variations sheet thickness lightweight fiberglass cloth applied wing skin before putting skin foam wing skin placed table has covered wax paper piece glass cloth cut slightly larger skin sandable epoxy like Southern R/G Products Epoxy Kit used stick cloth skin hold cloth over skin brush epoxy through cloth skin Small wrinkles easily removed pulling along edges cloth excess epoxy removed soaked up using roll toilet paper short piece broom handle As outer layer paper becomes soaked peeled off discarded Keep up process until no epoxy appears toilet paper Trim off excess glass cloth epoxy has cured skin applied foam wing glass cloth outside might surprised hear people werent sure glass cloth keeps balsa cracking skin rolled around wing leading edge After wing sections joined light sanding two coats good primer sanded between coats will make cloth weave disappear Try Ron Van Putte 12 Connie Drive Shal imar FL 32579 writing advertisers mention read about Model Aviation July1979 103 INTRODUCTORY PRICE 5 cyl price- -$68500 7 cvi price - $78500OPtlONA ONBOARD IGNITION Anodized Black - $ 5000 uding Fast Chorger54500