John F Kilsdonk THE CL GOODYEAR Scale Racing event has enjoyed seven very popular years official AMA event event least rule-wise basically same 1968 some noticeable changes have taken place intent article attempt describe techno logical changes update so-called state-of-the-art Zipper model presented arti cle designed take full advantage new technology currently available event Perhaps noticed im provement event has creased airspeed models primary reason has advent Scheurle-ported engine design Al though now quite few different engines available three-intakeport design Rossi 15 has quickly emerged rule Goodyear event one-for-one basis engine pro duces 2000 rpm previous king event Super Tigre 15 improvement does come easily though Rossi difficult find times approximately triple price ST Replacement parts limited im possible locate put forth effort locate willing pay asking price two-thirds way home Now have rework engine us have some professional several people rework engines varying degrees proficiency Without doubt George Aldrich has best track record reworking Rossi 15s Good year rework engine consists Control Line GoodyearAn Update zjpper Because little has published late type model definitive article plan fill deep information gap author well known CL Racing circles making new cylinder head retiming crankshaft fitting piston cylinder piston-to-cylinder fit prob ably critical item must run fast must restart George seems have magic touch area Contact him directly details prices GMA Models 1317 St Marie Mission Texas 78572 further performance increases might experiment exhaust tuning have much luck expansion chambers ala CL speed have seen some interesting results using megaphones megaphone shown Fig No basically Rossi megaphone cant find look Rossi expan sion chamber cut off back section will have same thing strike out also still want pursue project can make yourself lathe have made tried several variations shown have found design best Bench tests properly tuned Rossi 50 percent nitro fuel prop pitched Fig No 2 should show rpm reading between 20000 21000 rpm Using leather glove holding megaphone engine should indicate 1000 1500 rpm increase above figure quite interesting looks like quick performance gain However gain static rpm due megaphone may fully realized air due some increase drag frontal area megaphone although some definite im provement will found Zipper used test bed megaphone particular design selected due its wing location respect axial centerline other September 1975 13 shut-off shown actuated pushrod Close-up model shows salient features design particular note cheekfull-down position megaphone fits snugly cowl covers fuel tank cowl removable access tank Rossi 15 producesover wing adds 1 OOO 1500 rpm sizeable rpm increase over Supertigre three times costthe static thrust NO OCR TEXT Control Line Goodyear words megaphone has clear wing Midget Mustangs several other designs low wings fit criteria also wings too low causing peculiar flying characteristics especially higher altitudes flight tests both megaphone indicate megaphone gives approximately 05 sec onds advantage eight laps about three mph Construction construction very straightforward typical Goodyear racers exception fuel tank stallation inboard side fuse lage necessary provide clearance megaphone fuel shut-off also necessitates fabricating large cheek cowl house fuel tank have access vacuum-forming facility fabricated 060 acetate plastic turned out similar bubble canopy could also probably use Alternate con struction cowl also possible balsa and/or fiberglass fuel tank held position rubber bands cowl held place angle brackets model shown However could just well epoxy both fuel tank cowl 750 3625 7553630 573 REF Not INSIDE DIAMETERS ARE CRITICAL OU1S0E DIAMETERS VARY WITH WALL THICKNESS ROSSI IS MEGAPHONE FIGURE NO1 place would sacrifice removeability case repair fuel shut-off shown plans mouse trap design fabricated inum plate using hack band saw some file work other components ordinary piano wire Du Bro wheel collars spring 080111 ID 020 WALL CONSTANT 023 MTL ALUMHUM September 1975 15 Above Fuel shut-off fits neatly between megaphone fuselage Right Another view megaphone source givenalso gear 00 NOT SCALE Downb JFK Left Underneath view shows landing gear fuel line details Another type landing gear may substituted Right Overall view model Design selected positions wing clear megaphone 0 I I 2 II I INC HE S 4-3/4 5 q5-1/2 5-1/2 q6 PROP PITCH TABLE FIGURE NO2 Control Line Goodyear springs have found best can purchased good hardware stores Select-A-Spring No 1 Make sure after shut-off assembled will completely squeeze off two pieces tubing tripped Alternate shut offs also commercially available W-K Hobbies 19 N Main Centerville Ohio 45459 513 433-0752 landing gear shown 060-inch titanium Since material hard find difficult work get pre-bent ready install Glenn Lee 819 Mandrake Batavia III 60510 Glenn also has available some excellent polyurethane wheels finishing technique prefer cover entire wing -oz fiber glass cloth polyester surfacing resin K&B Hobbypoxy Sig etc using microballoons fillets nicks After surface has prepared finish sanded 150-grit paper two coats Hobbypoxy color sprayed wet sanding between coats decals applied canopy trim put coat clear Hobbypoxy sprayed wet sanded 600 paper rubbed out waxed Install engine other hardware youre ready fly propeller next critical item fiberglass props seem give best performance also durable Bartels props made Ger about elusive Rossi engines K&W also makes some nice props available through Joe Klause 5851 Sandstone Dr Durham NC 27707 also other outlets basic 7-6 prop used pitched least start values shown Fig No 2 best results pitch gauge should used might experiment some different prop pitches values shown what have found best also necessary maintain same width thickness both prop blades pitching station dial caliper works best After have completed pitching routine make sure prop properly balanced fuel have found 50 percent nitromethane blend good place start minimum 20 percent synthetic oil Ucon LB 1025 Klotz should used blends balance being made up methanol increase nitro de crease methanol maintaining same percentage oil Premixed fuel avail able W-K Hobbies address same fuel shut-offs World Engines Randys Model Aeronautics 515 Coleman Blvd Mount Pleasant SC 29464 803 884-7411 continued page 79 16 Model Aviation Prop pitch gauge important top performance File used rework blades Calipers help con trol thickness blades picture parts layout mskes things look great deal simpler Note hardwood motor mount left picture also matching ply doublers Below Cheek cowl engine removed show motor mount tank installation details tank rubber-banded its position fits through opening ply doubler motor mount itself entire wing covered 1/2-oz fiberglass cloth polyester resinsuch K&B Hobby Poxy Sig Fiberglass props seem aive best Derformance also durable
Edition: Model Aviation - 1975/09
Page Numbers: 13, 14, 15, 16
John F Kilsdonk THE CL GOODYEAR Scale Racing event has enjoyed seven very popular years official AMA event event least rule-wise basically same 1968 some noticeable changes have taken place intent article attempt describe techno logical changes update so-called state-of-the-art Zipper model presented arti cle designed take full advantage new technology currently available event Perhaps noticed im provement event has creased airspeed models primary reason has advent Scheurle-ported engine design Al though now quite few different engines available three-intakeport design Rossi 15 has quickly emerged rule Goodyear event one-for-one basis engine pro duces 2000 rpm previous king event Super Tigre 15 improvement does come easily though Rossi difficult find times approximately triple price ST Replacement parts limited im possible locate put forth effort locate willing pay asking price two-thirds way home Now have rework engine us have some professional several people rework engines varying degrees proficiency Without doubt George Aldrich has best track record reworking Rossi 15s Good year rework engine consists Control Line GoodyearAn Update zjpper Because little has published late type model definitive article plan fill deep information gap author well known CL Racing circles making new cylinder head retiming crankshaft fitting piston cylinder piston-to-cylinder fit prob ably critical item must run fast must restart George seems have magic touch area Contact him directly details prices GMA Models 1317 St Marie Mission Texas 78572 further performance increases might experiment exhaust tuning have much luck expansion chambers ala CL speed have seen some interesting results using megaphones megaphone shown Fig No basically Rossi megaphone cant find look Rossi expan sion chamber cut off back section will have same thing strike out also still want pursue project can make yourself lathe have made tried several variations shown have found design best Bench tests properly tuned Rossi 50 percent nitro fuel prop pitched Fig No 2 should show rpm reading between 20000 21000 rpm Using leather glove holding megaphone engine should indicate 1000 1500 rpm increase above figure quite interesting looks like quick performance gain However gain static rpm due megaphone may fully realized air due some increase drag frontal area megaphone although some definite im provement will found Zipper used test bed megaphone particular design selected due its wing location respect axial centerline other September 1975 13 shut-off shown actuated pushrod Close-up model shows salient features design particular note cheekfull-down position megaphone fits snugly cowl covers fuel tank cowl removable access tank Rossi 15 producesover wing adds 1 OOO 1500 rpm sizeable rpm increase over Supertigre three times costthe static thrust NO OCR TEXT Control Line Goodyear words megaphone has clear wing Midget Mustangs several other designs low wings fit criteria also wings too low causing peculiar flying characteristics especially higher altitudes flight tests both megaphone indicate megaphone gives approximately 05 sec onds advantage eight laps about three mph Construction construction very straightforward typical Goodyear racers exception fuel tank stallation inboard side fuse lage necessary provide clearance megaphone fuel shut-off also necessitates fabricating large cheek cowl house fuel tank have access vacuum-forming facility fabricated 060 acetate plastic turned out similar bubble canopy could also probably use Alternate con struction cowl also possible balsa and/or fiberglass fuel tank held position rubber bands cowl held place angle brackets model shown However could just well epoxy both fuel tank cowl 750 3625 7553630 573 REF Not INSIDE DIAMETERS ARE CRITICAL OU1S0E DIAMETERS VARY WITH WALL THICKNESS ROSSI IS MEGAPHONE FIGURE NO1 place would sacrifice removeability case repair fuel shut-off shown plans mouse trap design fabricated inum plate using hack band saw some file work other components ordinary piano wire Du Bro wheel collars spring 080111 ID 020 WALL CONSTANT 023 MTL ALUMHUM September 1975 15 Above Fuel shut-off fits neatly between megaphone fuselage Right Another view megaphone source givenalso gear 00 NOT SCALE Downb JFK Left Underneath view shows landing gear fuel line details Another type landing gear may substituted Right Overall view model Design selected positions wing clear megaphone 0 I I 2 II I INC HE S 4-3/4 5 q5-1/2 5-1/2 q6 PROP PITCH TABLE FIGURE NO2 Control Line Goodyear springs have found best can purchased good hardware stores Select-A-Spring No 1 Make sure after shut-off assembled will completely squeeze off two pieces tubing tripped Alternate shut offs also commercially available W-K Hobbies 19 N Main Centerville Ohio 45459 513 433-0752 landing gear shown 060-inch titanium Since material hard find difficult work get pre-bent ready install Glenn Lee 819 Mandrake Batavia III 60510 Glenn also has available some excellent polyurethane wheels finishing technique prefer cover entire wing -oz fiber glass cloth polyester surfacing resin K&B Hobbypoxy Sig etc using microballoons fillets nicks After surface has prepared finish sanded 150-grit paper two coats Hobbypoxy color sprayed wet sanding between coats decals applied canopy trim put coat clear Hobbypoxy sprayed wet sanded 600 paper rubbed out waxed Install engine other hardware youre ready fly propeller next critical item fiberglass props seem give best performance also durable Bartels props made Ger about elusive Rossi engines K&W also makes some nice props available through Joe Klause 5851 Sandstone Dr Durham NC 27707 also other outlets basic 7-6 prop used pitched least start values shown Fig No 2 best results pitch gauge should used might experiment some different prop pitches values shown what have found best also necessary maintain same width thickness both prop blades pitching station dial caliper works best After have completed pitching routine make sure prop properly balanced fuel have found 50 percent nitromethane blend good place start minimum 20 percent synthetic oil Ucon LB 1025 Klotz should used blends balance being made up methanol increase nitro de crease methanol maintaining same percentage oil Premixed fuel avail able W-K Hobbies address same fuel shut-offs World Engines Randys Model Aeronautics 515 Coleman Blvd Mount Pleasant SC 29464 803 884-7411 continued page 79 16 Model Aviation Prop pitch gauge important top performance File used rework blades Calipers help con trol thickness blades picture parts layout mskes things look great deal simpler Note hardwood motor mount left picture also matching ply doublers Below Cheek cowl engine removed show motor mount tank installation details tank rubber-banded its position fits through opening ply doubler motor mount itself entire wing covered 1/2-oz fiberglass cloth polyester resinsuch K&B Hobby Poxy Sig Fiberglass props seem aive best Derformance also durable
Edition: Model Aviation - 1975/09
Page Numbers: 13, 14, 15, 16
John F Kilsdonk THE CL GOODYEAR Scale Racing event has enjoyed seven very popular years official AMA event event least rule-wise basically same 1968 some noticeable changes have taken place intent article attempt describe techno logical changes update so-called state-of-the-art Zipper model presented arti cle designed take full advantage new technology currently available event Perhaps noticed im provement event has creased airspeed models primary reason has advent Scheurle-ported engine design Al though now quite few different engines available three-intakeport design Rossi 15 has quickly emerged rule Goodyear event one-for-one basis engine pro duces 2000 rpm previous king event Super Tigre 15 improvement does come easily though Rossi difficult find times approximately triple price ST Replacement parts limited im possible locate put forth effort locate willing pay asking price two-thirds way home Now have rework engine us have some professional several people rework engines varying degrees proficiency Without doubt George Aldrich has best track record reworking Rossi 15s Good year rework engine consists Control Line GoodyearAn Update zjpper Because little has published late type model definitive article plan fill deep information gap author well known CL Racing circles making new cylinder head retiming crankshaft fitting piston cylinder piston-to-cylinder fit prob ably critical item must run fast must restart George seems have magic touch area Contact him directly details prices GMA Models 1317 St Marie Mission Texas 78572 further performance increases might experiment exhaust tuning have much luck expansion chambers ala CL speed have seen some interesting results using megaphones megaphone shown Fig No basically Rossi megaphone cant find look Rossi expan sion chamber cut off back section will have same thing strike out also still want pursue project can make yourself lathe have made tried several variations shown have found design best Bench tests properly tuned Rossi 50 percent nitro fuel prop pitched Fig No 2 should show rpm reading between 20000 21000 rpm Using leather glove holding megaphone engine should indicate 1000 1500 rpm increase above figure quite interesting looks like quick performance gain However gain static rpm due megaphone may fully realized air due some increase drag frontal area megaphone although some definite im provement will found Zipper used test bed megaphone particular design selected due its wing location respect axial centerline other September 1975 13 shut-off shown actuated pushrod Close-up model shows salient features design particular note cheekfull-down position megaphone fits snugly cowl covers fuel tank cowl removable access tank Rossi 15 producesover wing adds 1 OOO 1500 rpm sizeable rpm increase over Supertigre three times costthe static thrust NO OCR TEXT Control Line Goodyear words megaphone has clear wing Midget Mustangs several other designs low wings fit criteria also wings too low causing peculiar flying characteristics especially higher altitudes flight tests both megaphone indicate megaphone gives approximately 05 sec onds advantage eight laps about three mph Construction construction very straightforward typical Goodyear racers exception fuel tank stallation inboard side fuse lage necessary provide clearance megaphone fuel shut-off also necessitates fabricating large cheek cowl house fuel tank have access vacuum-forming facility fabricated 060 acetate plastic turned out similar bubble canopy could also probably use Alternate con struction cowl also possible balsa and/or fiberglass fuel tank held position rubber bands cowl held place angle brackets model shown However could just well epoxy both fuel tank cowl 750 3625 7553630 573 REF Not INSIDE DIAMETERS ARE CRITICAL OU1S0E DIAMETERS VARY WITH WALL THICKNESS ROSSI IS MEGAPHONE FIGURE NO1 place would sacrifice removeability case repair fuel shut-off shown plans mouse trap design fabricated inum plate using hack band saw some file work other components ordinary piano wire Du Bro wheel collars spring 080111 ID 020 WALL CONSTANT 023 MTL ALUMHUM September 1975 15 Above Fuel shut-off fits neatly between megaphone fuselage Right Another view megaphone source givenalso gear 00 NOT SCALE Downb JFK Left Underneath view shows landing gear fuel line details Another type landing gear may substituted Right Overall view model Design selected positions wing clear megaphone 0 I I 2 II I INC HE S 4-3/4 5 q5-1/2 5-1/2 q6 PROP PITCH TABLE FIGURE NO2 Control Line Goodyear springs have found best can purchased good hardware stores Select-A-Spring No 1 Make sure after shut-off assembled will completely squeeze off two pieces tubing tripped Alternate shut offs also commercially available W-K Hobbies 19 N Main Centerville Ohio 45459 513 433-0752 landing gear shown 060-inch titanium Since material hard find difficult work get pre-bent ready install Glenn Lee 819 Mandrake Batavia III 60510 Glenn also has available some excellent polyurethane wheels finishing technique prefer cover entire wing -oz fiber glass cloth polyester surfacing resin K&B Hobbypoxy Sig etc using microballoons fillets nicks After surface has prepared finish sanded 150-grit paper two coats Hobbypoxy color sprayed wet sanding between coats decals applied canopy trim put coat clear Hobbypoxy sprayed wet sanded 600 paper rubbed out waxed Install engine other hardware youre ready fly propeller next critical item fiberglass props seem give best performance also durable Bartels props made Ger about elusive Rossi engines K&W also makes some nice props available through Joe Klause 5851 Sandstone Dr Durham NC 27707 also other outlets basic 7-6 prop used pitched least start values shown Fig No 2 best results pitch gauge should used might experiment some different prop pitches values shown what have found best also necessary maintain same width thickness both prop blades pitching station dial caliper works best After have completed pitching routine make sure prop properly balanced fuel have found 50 percent nitromethane blend good place start minimum 20 percent synthetic oil Ucon LB 1025 Klotz should used blends balance being made up methanol increase nitro de crease methanol maintaining same percentage oil Premixed fuel avail able W-K Hobbies address same fuel shut-offs World Engines Randys Model Aeronautics 515 Coleman Blvd Mount Pleasant SC 29464 803 884-7411 continued page 79 16 Model Aviation Prop pitch gauge important top performance File used rework blades Calipers help con trol thickness blades picture parts layout mskes things look great deal simpler Note hardwood motor mount left picture also matching ply doublers Below Cheek cowl engine removed show motor mount tank installation details tank rubber-banded its position fits through opening ply doubler motor mount itself entire wing covered 1/2-oz fiberglass cloth polyester resinsuch K&B Hobby Poxy Sig Fiberglass props seem aive best Derformance also durable
Edition: Model Aviation - 1975/09
Page Numbers: 13, 14, 15, 16
John F Kilsdonk THE CL GOODYEAR Scale Racing event has enjoyed seven very popular years official AMA event event least rule-wise basically same 1968 some noticeable changes have taken place intent article attempt describe techno logical changes update so-called state-of-the-art Zipper model presented arti cle designed take full advantage new technology currently available event Perhaps noticed im provement event has creased airspeed models primary reason has advent Scheurle-ported engine design Al though now quite few different engines available three-intakeport design Rossi 15 has quickly emerged rule Goodyear event one-for-one basis engine pro duces 2000 rpm previous king event Super Tigre 15 improvement does come easily though Rossi difficult find times approximately triple price ST Replacement parts limited im possible locate put forth effort locate willing pay asking price two-thirds way home Now have rework engine us have some professional several people rework engines varying degrees proficiency Without doubt George Aldrich has best track record reworking Rossi 15s Good year rework engine consists Control Line GoodyearAn Update zjpper Because little has published late type model definitive article plan fill deep information gap author well known CL Racing circles making new cylinder head retiming crankshaft fitting piston cylinder piston-to-cylinder fit prob ably critical item must run fast must restart George seems have magic touch area Contact him directly details prices GMA Models 1317 St Marie Mission Texas 78572 further performance increases might experiment exhaust tuning have much luck expansion chambers ala CL speed have seen some interesting results using megaphones megaphone shown Fig No basically Rossi megaphone cant find look Rossi expan sion chamber cut off back section will have same thing strike out also still want pursue project can make yourself lathe have made tried several variations shown have found design best Bench tests properly tuned Rossi 50 percent nitro fuel prop pitched Fig No 2 should show rpm reading between 20000 21000 rpm Using leather glove holding megaphone engine should indicate 1000 1500 rpm increase above figure quite interesting looks like quick performance gain However gain static rpm due megaphone may fully realized air due some increase drag frontal area megaphone although some definite im provement will found Zipper used test bed megaphone particular design selected due its wing location respect axial centerline other September 1975 13 shut-off shown actuated pushrod Close-up model shows salient features design particular note cheekfull-down position megaphone fits snugly cowl covers fuel tank cowl removable access tank Rossi 15 producesover wing adds 1 OOO 1500 rpm sizeable rpm increase over Supertigre three times costthe static thrust NO OCR TEXT Control Line Goodyear words megaphone has clear wing Midget Mustangs several other designs low wings fit criteria also wings too low causing peculiar flying characteristics especially higher altitudes flight tests both megaphone indicate megaphone gives approximately 05 sec onds advantage eight laps about three mph Construction construction very straightforward typical Goodyear racers exception fuel tank stallation inboard side fuse lage necessary provide clearance megaphone fuel shut-off also necessitates fabricating large cheek cowl house fuel tank have access vacuum-forming facility fabricated 060 acetate plastic turned out similar bubble canopy could also probably use Alternate con struction cowl also possible balsa and/or fiberglass fuel tank held position rubber bands cowl held place angle brackets model shown However could just well epoxy both fuel tank cowl 750 3625 7553630 573 REF Not INSIDE DIAMETERS ARE CRITICAL OU1S0E DIAMETERS VARY WITH WALL THICKNESS ROSSI IS MEGAPHONE FIGURE NO1 place would sacrifice removeability case repair fuel shut-off shown plans mouse trap design fabricated inum plate using hack band saw some file work other components ordinary piano wire Du Bro wheel collars spring 080111 ID 020 WALL CONSTANT 023 MTL ALUMHUM September 1975 15 Above Fuel shut-off fits neatly between megaphone fuselage Right Another view megaphone source givenalso gear 00 NOT SCALE Downb JFK Left Underneath view shows landing gear fuel line details Another type landing gear may substituted Right Overall view model Design selected positions wing clear megaphone 0 I I 2 II I INC HE S 4-3/4 5 q5-1/2 5-1/2 q6 PROP PITCH TABLE FIGURE NO2 Control Line Goodyear springs have found best can purchased good hardware stores Select-A-Spring No 1 Make sure after shut-off assembled will completely squeeze off two pieces tubing tripped Alternate shut offs also commercially available W-K Hobbies 19 N Main Centerville Ohio 45459 513 433-0752 landing gear shown 060-inch titanium Since material hard find difficult work get pre-bent ready install Glenn Lee 819 Mandrake Batavia III 60510 Glenn also has available some excellent polyurethane wheels finishing technique prefer cover entire wing -oz fiber glass cloth polyester surfacing resin K&B Hobbypoxy Sig etc using microballoons fillets nicks After surface has prepared finish sanded 150-grit paper two coats Hobbypoxy color sprayed wet sanding between coats decals applied canopy trim put coat clear Hobbypoxy sprayed wet sanded 600 paper rubbed out waxed Install engine other hardware youre ready fly propeller next critical item fiberglass props seem give best performance also durable Bartels props made Ger about elusive Rossi engines K&W also makes some nice props available through Joe Klause 5851 Sandstone Dr Durham NC 27707 also other outlets basic 7-6 prop used pitched least start values shown Fig No 2 best results pitch gauge should used might experiment some different prop pitches values shown what have found best also necessary maintain same width thickness both prop blades pitching station dial caliper works best After have completed pitching routine make sure prop properly balanced fuel have found 50 percent nitromethane blend good place start minimum 20 percent synthetic oil Ucon LB 1025 Klotz should used blends balance being made up methanol increase nitro de crease methanol maintaining same percentage oil Premixed fuel avail able W-K Hobbies address same fuel shut-offs World Engines Randys Model Aeronautics 515 Coleman Blvd Mount Pleasant SC 29464 803 884-7411 continued page 79 16 Model Aviation Prop pitch gauge important top performance File used rework blades Calipers help con trol thickness blades picture parts layout mskes things look great deal simpler Note hardwood motor mount left picture also matching ply doublers Below Cheek cowl engine removed show motor mount tank installation details tank rubber-banded its position fits through opening ply doubler motor mount itself entire wing covered 1/2-oz fiberglass cloth polyester resinsuch K&B Hobby Poxy Sig Fiberglass props seem aive best Derformance also durable