FREE FLIGHT DURATION C02 MY YOUTHFUL memories CO2 motors somewhat limited remember seeing two around dont ever remember seeing air however remember Monogram C02-powered rocketit looked like V-2 didnt use motor just CO2 cartridge stuck back solid balsa model rocket ran horizontally along wire guided couple eye hooks body Lots fun During last few years Ive noticing considerable number articles about CO2 motors models several newsletters NFFS Digest Vol Libre articles work man Fritz Mueller Columbus Georgia articles have covered fine points loading tank get maximum amount liquid CO2 tank complete pressureversus-temperature graphs point Fritz stresses need keep CO2 models simple pieces detailed adaptation Lee Campbells popular Souper 30 P-30 kit use CO2 motor involves discarding rubber-model nose block prop temporarily strapping CO2 engine tank balance model proper CC center gravity engine mounted plywood former give four degrees downthrust degree right thrust top bottom bays just front pylon sheeted /32 balsa holes cut hold tank couldnt simpler Much Fritzs extensive knowledge CO2 comes conversations George Benedek Hungary Yes same Benedek developed wonderful Free Flight airfoils flew him contest talked shop home congenial wife Gisela cooked up delicious Hungarian meals writes Fritz Benedek won Jiri Smola Memorial CO2 competitions three years rowthe first against 140 competitors After Jiri Smola rules changed FiK formula give other competitors chance Now model square wings no tapers no geodesic ribs no folding prop would otherwise Fritz asks Rather rocket climbs used power models CO2 models climb like rubber model cruise portion unwinding curve means shallow climb around eight degrees relatively low power means no need auto surfaces other design engineering complications slow climb also means model doesnt need stiff structure required fast-climbing Wakefield power model rather mild power would make CO2 very good beginners class What CO2 motor may lack power makes up length motor run proper filling motor run excess two-minute flight maximum possible Coupled light wing loading models has lead some unusual DT dethermalizing techniques involving pop-up wings rotating rudders contest flyoffs contestant must start motor allow run ground set time much minute release model April 1998 115 American proponent CO2 Fritz Mueller prepares launch GM-63 powered model Wingspan 22 inches simple lightweight model George Benedek Hungary adjusts Modela-powered CO2 model Wing 1958 Wakefield placed fifth World Championships year Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller PAL Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstarnetcom effort reduce performance FiK class models rules changed last year include minimum weight maximum wing area tank size kept 3cc hut cooling tank charger permitted European response rules see drawing Kele X Fritzs own response favor simple P-30-style event minimum wingspan length rules information about C02 order GM-63 motor can contact Fritz directly Fritz Mueller 4117 Searcy Street Columbus GA 31907 Im sure stamped self-addressed envelope would appreciated Kele X latest issue French Free Flight magazine Vol Libre included clean FiK model Istvan Harsfalvi new rules international CO2 competition specify minimum weight 75 grams maximum projected surface area wing tail 12 sq din works out bit three ounces area about 186 square inches tank size limited 3cc Kele X has wingspan 1120mm about 44 inches wing area 1004 sq din about 155 square inches stab area 189 sq dm about 30 square inches 20% wing area model has several interesting structural features wing uses carbon-fiber D-box full-depth balsa spar instead open rear structure back portion wing sheeted top bottom 4 mm Depron entire stab sheeted 03 mm Depron extruded foam plastic material used Europe wall insulation So far have found source country Note wing spar doubled Perhaps wing panel built halves allow difference thickness between carbon D-box skin Join squadron Brand new squadron markings. Available L 4OO o- a44 1/8 1/6 & 1/4 scales Caa1 & Cooi CkaAt D Theres always thing new major decals29 works.squadron insinias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAO0W MA 01028 TEL 413-525-4110 FAX 413-525-7794 116 Model Aviation il Benedeks model shows simple installation motor tank Fitting above engine filler tip used charge tank thicker Depron sheeting rear portion fuselage round crosssection made carbon Keviar 270mm diameter homemade prop turns around 1000 rpm very poor German correct bladed prop moderately high-aspect-ratio wing slender fuselage overall clean lines show obvious attempt drag reduction feel important often ignored factor Low drag especially important small lightly-loaded models get glide speed up enough move airfoil decent Reynolds number range Flying Rain Sunday last October crawled out bed three am loaded up car made three-hour drive Crawfordsville Georgia Thermal Thumbers Metro Atlantas Fall contest weather reports promising light rain falling got field Best absolutely no wind years since flown rain thought would good learning experience new plastic coverings really work well wet weather no sign sagging get Japanese tissue collect water Although wiped wing tail off between flights could tell model getting more tail-heavy typical Wakefield has center gravity around 55% tail moment arm around 900mm small stab As CG kept shifting aft stall started creeping glide did easy thing started pulling trailing edge stab down turned out wrong choice After few flights run out adjustment ALUMINUM CENTER STOCK NO 3000 K&S has added 28 new aluminum items its product line Aluminum Center features round square tubing rod sheet 12 lengths round tubes rods sheets 6061 -T6 aluminum alloy very strong lightweight square tubing 3003-H14 aluminum alloy very easy work carefully engineered line aluminum products has unlimited uses development types projects KS ENGINEERING 6917 W 59th Street ago IL 60638 773 586-8503 773 586-8556 VIDEO $995 L APPLIES 10 PURCHASE PRICE OF KIT KIT $26500 PLANS $3500 MUD DUCK AVIATION 7118 West moreland Dr WarrentonVA 20187 540 347-1134 April1998 117 Another Benedek model has inverted engine underslung tank Because low rpm molded plastic props can safely used CO2 See giant FLY SEND $100 FOR OUR FULL LINE CATALOG V APRIL FOOL cZ might lust 1st real still dont have WALSTON RETRIEVAL SYSTEM kind yourself disposition year Make flying season easier Call us now WALSTON RETRIEVAL SYSTEMS 725 Cooper Lake Rd SE Smyrna GA 30082 770-434-4905 800-657-4672 Fax 770-431-0119 Visa AmEx PRECISION FIBERGJ Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 9am 6 pm EDT7 ONALA HOBBY STORES ASSOCIA11O INC Send $1 00 catalog $200 Outside US Dept 3 2805 Big Bend Dr ville TN 37803 LOOK FOR YOUR LOCAL NRHSA HOBBY SHOP ON SITE EXPERT ADVICE AND INFORMATION QUALITY MODELING PRODUCTS WERE THERE WHEN YOU NEED US WHERE ELSE CAN YOU GET THAT GLOW PLUG ON SATURDAY MORNING AMA FAX APPLICATIONS AVAILABLE LOCAL CLUB NEWS AND HAPPENINGS PART OF NATIONWIDE ORGANIZATION WORKING FOR THE BETTERMENT OF THE HOBBY INDUSTRY HAVE YOU EVER RACED ON MAIL ORDER TRACK REMEMBER WHO GOT YOU STARTED IN R/C screw couldnt pull stab down further Much worse model also run out stall recovery CG back around 65% because water tail decalage difference incidence between wing stab incidence reduced model would recover stall hindsight should have left stab incidence alone added nose weight get rid stall glide got back home stripped 1/4-mil MylarTM covering off stab placed stab structure scale no visible moisture stab didnt feel damp recorded weight next day stab some 8 g lighter water evaporated Note stab carbon D box trailing edge balsa parts spar ribs Flying rain also taught few things about clothes other gear good rain suit must waterproof hat biggest problem reading glasses normally wear string around neck dont lose rain lenses hang parallel ground act like two small saucers collect raindrops finally resorted keeping pocket Visibility retrieval can problem rain heavy overcast Luckily calm conditions morning meant chases less 100 yards really nice watch model gliding circle right around launch point did have pair yellow sunglasses available necessary Favored shooters cut through haze increase contrast 4118 Model Aviation 4The Worlds Finest Laser Cut Rubber Powered Free Flight Scale Kits nrr worlds leader Laser Cut Model Aircraft Kits Engineering kft features finest LASER CUT BALSA PARTS Contest Rubber Detailed Computer Dabw7 Plans Corporation Complete Hardvere PacA Authentic Watersllde Decaib Molded PlastIc Propeller Real Colored TIssue Light Wwght Wheels Complete Step t Step Building Instruc*lons Please check local hobby dealer fireL kIts availabl better hobby shops around world 1431 Chaffee Dr Suite #3 Full Line catejag $200 Add $450 shipping khOverseas orders add 20%Fl residents add 6% sales tax Tltuavifle FL 32780 KMade USADealer inquires invited407 264-2488
Edition: Model Aviation - 1998/04
Page Numbers: 115, 116, 117, 118
Edition: Model Aviation - 1998/04
Page Numbers: 115, 116, 117, 118
FREE FLIGHT DURATION C02 MY YOUTHFUL memories CO2 motors somewhat limited remember seeing two around dont ever remember seeing air however remember Monogram C02-powered rocketit looked like V-2 didnt use motor just CO2 cartridge stuck back solid balsa model rocket ran horizontally along wire guided couple eye hooks body Lots fun During last few years Ive noticing considerable number articles about CO2 motors models several newsletters NFFS Digest Vol Libre articles work man Fritz Mueller Columbus Georgia articles have covered fine points loading tank get maximum amount liquid CO2 tank complete pressureversus-temperature graphs point Fritz stresses need keep CO2 models simple pieces detailed adaptation Lee Campbells popular Souper 30 P-30 kit use CO2 motor involves discarding rubber-model nose block prop temporarily strapping CO2 engine tank balance model proper CC center gravity engine mounted plywood former give four degrees downthrust degree right thrust top bottom bays just front pylon sheeted /32 balsa holes cut hold tank couldnt simpler Much Fritzs extensive knowledge CO2 comes conversations George Benedek Hungary Yes same Benedek developed wonderful Free Flight airfoils flew him contest talked shop home congenial wife Gisela cooked up delicious Hungarian meals writes Fritz Benedek won Jiri Smola Memorial CO2 competitions three years rowthe first against 140 competitors After Jiri Smola rules changed FiK formula give other competitors chance Now model square wings no tapers no geodesic ribs no folding prop would otherwise Fritz asks Rather rocket climbs used power models CO2 models climb like rubber model cruise portion unwinding curve means shallow climb around eight degrees relatively low power means no need auto surfaces other design engineering complications slow climb also means model doesnt need stiff structure required fast-climbing Wakefield power model rather mild power would make CO2 very good beginners class What CO2 motor may lack power makes up length motor run proper filling motor run excess two-minute flight maximum possible Coupled light wing loading models has lead some unusual DT dethermalizing techniques involving pop-up wings rotating rudders contest flyoffs contestant must start motor allow run ground set time much minute release model April 1998 115 American proponent CO2 Fritz Mueller prepares launch GM-63 powered model Wingspan 22 inches simple lightweight model George Benedek Hungary adjusts Modela-powered CO2 model Wing 1958 Wakefield placed fifth World Championships year Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller PAL Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstarnetcom effort reduce performance FiK class models rules changed last year include minimum weight maximum wing area tank size kept 3cc hut cooling tank charger permitted European response rules see drawing Kele X Fritzs own response favor simple P-30-style event minimum wingspan length rules information about C02 order GM-63 motor can contact Fritz directly Fritz Mueller 4117 Searcy Street Columbus GA 31907 Im sure stamped self-addressed envelope would appreciated Kele X latest issue French Free Flight magazine Vol Libre included clean FiK model Istvan Harsfalvi new rules international CO2 competition specify minimum weight 75 grams maximum projected surface area wing tail 12 sq din works out bit three ounces area about 186 square inches tank size limited 3cc Kele X has wingspan 1120mm about 44 inches wing area 1004 sq din about 155 square inches stab area 189 sq dm about 30 square inches 20% wing area model has several interesting structural features wing uses carbon-fiber D-box full-depth balsa spar instead open rear structure back portion wing sheeted top bottom 4 mm Depron entire stab sheeted 03 mm Depron extruded foam plastic material used Europe wall insulation So far have found source country Note wing spar doubled Perhaps wing panel built halves allow difference thickness between carbon D-box skin Join squadron Brand new squadron markings. Available L 4OO o- a44 1/8 1/6 & 1/4 scales Caa1 & Cooi CkaAt D Theres always thing new major decals29 works.squadron insinias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAO0W MA 01028 TEL 413-525-4110 FAX 413-525-7794 116 Model Aviation il Benedeks model shows simple installation motor tank Fitting above engine filler tip used charge tank thicker Depron sheeting rear portion fuselage round crosssection made carbon Keviar 270mm diameter homemade prop turns around 1000 rpm very poor German correct bladed prop moderately high-aspect-ratio wing slender fuselage overall clean lines show obvious attempt drag reduction feel important often ignored factor Low drag especially important small lightly-loaded models get glide speed up enough move airfoil decent Reynolds number range Flying Rain Sunday last October crawled out bed three am loaded up car made three-hour drive Crawfordsville Georgia Thermal Thumbers Metro Atlantas Fall contest weather reports promising light rain falling got field Best absolutely no wind years since flown rain thought would good learning experience new plastic coverings really work well wet weather no sign sagging get Japanese tissue collect water Although wiped wing tail off between flights could tell model getting more tail-heavy typical Wakefield has center gravity around 55% tail moment arm around 900mm small stab As CG kept shifting aft stall started creeping glide did easy thing started pulling trailing edge stab down turned out wrong choice After few flights run out adjustment ALUMINUM CENTER STOCK NO 3000 K&S has added 28 new aluminum items its product line Aluminum Center features round square tubing rod sheet 12 lengths round tubes rods sheets 6061 -T6 aluminum alloy very strong lightweight square tubing 3003-H14 aluminum alloy very easy work carefully engineered line aluminum products has unlimited uses development types projects KS ENGINEERING 6917 W 59th Street ago IL 60638 773 586-8503 773 586-8556 VIDEO $995 L APPLIES 10 PURCHASE PRICE OF KIT KIT $26500 PLANS $3500 MUD DUCK AVIATION 7118 West moreland Dr WarrentonVA 20187 540 347-1134 April1998 117 Another Benedek model has inverted engine underslung tank Because low rpm molded plastic props can safely used CO2 See giant FLY SEND $100 FOR OUR FULL LINE CATALOG V APRIL FOOL cZ might lust 1st real still dont have WALSTON RETRIEVAL SYSTEM kind yourself disposition year Make flying season easier Call us now WALSTON RETRIEVAL SYSTEMS 725 Cooper Lake Rd SE Smyrna GA 30082 770-434-4905 800-657-4672 Fax 770-431-0119 Visa AmEx PRECISION FIBERGJ Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 9am 6 pm EDT7 ONALA HOBBY STORES ASSOCIA11O INC Send $1 00 catalog $200 Outside US Dept 3 2805 Big Bend Dr ville TN 37803 LOOK FOR YOUR LOCAL NRHSA HOBBY SHOP ON SITE EXPERT ADVICE AND INFORMATION QUALITY MODELING PRODUCTS WERE THERE WHEN YOU NEED US WHERE ELSE CAN YOU GET THAT GLOW PLUG ON SATURDAY MORNING AMA FAX APPLICATIONS AVAILABLE LOCAL CLUB NEWS AND HAPPENINGS PART OF NATIONWIDE ORGANIZATION WORKING FOR THE BETTERMENT OF THE HOBBY INDUSTRY HAVE YOU EVER RACED ON MAIL ORDER TRACK REMEMBER WHO GOT YOU STARTED IN R/C screw couldnt pull stab down further Much worse model also run out stall recovery CG back around 65% because water tail decalage difference incidence between wing stab incidence reduced model would recover stall hindsight should have left stab incidence alone added nose weight get rid stall glide got back home stripped 1/4-mil MylarTM covering off stab placed stab structure scale no visible moisture stab didnt feel damp recorded weight next day stab some 8 g lighter water evaporated Note stab carbon D box trailing edge balsa parts spar ribs Flying rain also taught few things about clothes other gear good rain suit must waterproof hat biggest problem reading glasses normally wear string around neck dont lose rain lenses hang parallel ground act like two small saucers collect raindrops finally resorted keeping pocket Visibility retrieval can problem rain heavy overcast Luckily calm conditions morning meant chases less 100 yards really nice watch model gliding circle right around launch point did have pair yellow sunglasses available necessary Favored shooters cut through haze increase contrast 4118 Model Aviation 4The Worlds Finest Laser Cut Rubber Powered Free Flight Scale Kits nrr worlds leader Laser Cut Model Aircraft Kits Engineering kft features finest LASER CUT BALSA PARTS Contest Rubber Detailed Computer Dabw7 Plans Corporation Complete Hardvere PacA Authentic Watersllde Decaib Molded PlastIc Propeller Real Colored TIssue Light Wwght Wheels Complete Step t Step Building Instruc*lons Please check local hobby dealer fireL kIts availabl better hobby shops around world 1431 Chaffee Dr Suite #3 Full Line catejag $200 Add $450 shipping khOverseas orders add 20%Fl residents add 6% sales tax Tltuavifle FL 32780 KMade USADealer inquires invited407 264-2488
Edition: Model Aviation - 1998/04
Page Numbers: 115, 116, 117, 118
FREE FLIGHT DURATION C02 MY YOUTHFUL memories CO2 motors somewhat limited remember seeing two around dont ever remember seeing air however remember Monogram C02-powered rocketit looked like V-2 didnt use motor just CO2 cartridge stuck back solid balsa model rocket ran horizontally along wire guided couple eye hooks body Lots fun During last few years Ive noticing considerable number articles about CO2 motors models several newsletters NFFS Digest Vol Libre articles work man Fritz Mueller Columbus Georgia articles have covered fine points loading tank get maximum amount liquid CO2 tank complete pressureversus-temperature graphs point Fritz stresses need keep CO2 models simple pieces detailed adaptation Lee Campbells popular Souper 30 P-30 kit use CO2 motor involves discarding rubber-model nose block prop temporarily strapping CO2 engine tank balance model proper CC center gravity engine mounted plywood former give four degrees downthrust degree right thrust top bottom bays just front pylon sheeted /32 balsa holes cut hold tank couldnt simpler Much Fritzs extensive knowledge CO2 comes conversations George Benedek Hungary Yes same Benedek developed wonderful Free Flight airfoils flew him contest talked shop home congenial wife Gisela cooked up delicious Hungarian meals writes Fritz Benedek won Jiri Smola Memorial CO2 competitions three years rowthe first against 140 competitors After Jiri Smola rules changed FiK formula give other competitors chance Now model square wings no tapers no geodesic ribs no folding prop would otherwise Fritz asks Rather rocket climbs used power models CO2 models climb like rubber model cruise portion unwinding curve means shallow climb around eight degrees relatively low power means no need auto surfaces other design engineering complications slow climb also means model doesnt need stiff structure required fast-climbing Wakefield power model rather mild power would make CO2 very good beginners class What CO2 motor may lack power makes up length motor run proper filling motor run excess two-minute flight maximum possible Coupled light wing loading models has lead some unusual DT dethermalizing techniques involving pop-up wings rotating rudders contest flyoffs contestant must start motor allow run ground set time much minute release model April 1998 115 American proponent CO2 Fritz Mueller prepares launch GM-63 powered model Wingspan 22 inches simple lightweight model George Benedek Hungary adjusts Modela-powered CO2 model Wing 1958 Wakefield placed fifth World Championships year Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller PAL Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstarnetcom effort reduce performance FiK class models rules changed last year include minimum weight maximum wing area tank size kept 3cc hut cooling tank charger permitted European response rules see drawing Kele X Fritzs own response favor simple P-30-style event minimum wingspan length rules information about C02 order GM-63 motor can contact Fritz directly Fritz Mueller 4117 Searcy Street Columbus GA 31907 Im sure stamped self-addressed envelope would appreciated Kele X latest issue French Free Flight magazine Vol Libre included clean FiK model Istvan Harsfalvi new rules international CO2 competition specify minimum weight 75 grams maximum projected surface area wing tail 12 sq din works out bit three ounces area about 186 square inches tank size limited 3cc Kele X has wingspan 1120mm about 44 inches wing area 1004 sq din about 155 square inches stab area 189 sq dm about 30 square inches 20% wing area model has several interesting structural features wing uses carbon-fiber D-box full-depth balsa spar instead open rear structure back portion wing sheeted top bottom 4 mm Depron entire stab sheeted 03 mm Depron extruded foam plastic material used Europe wall insulation So far have found source country Note wing spar doubled Perhaps wing panel built halves allow difference thickness between carbon D-box skin Join squadron Brand new squadron markings. Available L 4OO o- a44 1/8 1/6 & 1/4 scales Caa1 & Cooi CkaAt D Theres always thing new major decals29 works.squadron insinias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAO0W MA 01028 TEL 413-525-4110 FAX 413-525-7794 116 Model Aviation il Benedeks model shows simple installation motor tank Fitting above engine filler tip used charge tank thicker Depron sheeting rear portion fuselage round crosssection made carbon Keviar 270mm diameter homemade prop turns around 1000 rpm very poor German correct bladed prop moderately high-aspect-ratio wing slender fuselage overall clean lines show obvious attempt drag reduction feel important often ignored factor Low drag especially important small lightly-loaded models get glide speed up enough move airfoil decent Reynolds number range Flying Rain Sunday last October crawled out bed three am loaded up car made three-hour drive Crawfordsville Georgia Thermal Thumbers Metro Atlantas Fall contest weather reports promising light rain falling got field Best absolutely no wind years since flown rain thought would good learning experience new plastic coverings really work well wet weather no sign sagging get Japanese tissue collect water Although wiped wing tail off between flights could tell model getting more tail-heavy typical Wakefield has center gravity around 55% tail moment arm around 900mm small stab As CG kept shifting aft stall started creeping glide did easy thing started pulling trailing edge stab down turned out wrong choice After few flights run out adjustment ALUMINUM CENTER STOCK NO 3000 K&S has added 28 new aluminum items its product line Aluminum Center features round square tubing rod sheet 12 lengths round tubes rods sheets 6061 -T6 aluminum alloy very strong lightweight square tubing 3003-H14 aluminum alloy very easy work carefully engineered line aluminum products has unlimited uses development types projects KS ENGINEERING 6917 W 59th Street ago IL 60638 773 586-8503 773 586-8556 VIDEO $995 L APPLIES 10 PURCHASE PRICE OF KIT KIT $26500 PLANS $3500 MUD DUCK AVIATION 7118 West moreland Dr WarrentonVA 20187 540 347-1134 April1998 117 Another Benedek model has inverted engine underslung tank Because low rpm molded plastic props can safely used CO2 See giant FLY SEND $100 FOR OUR FULL LINE CATALOG V APRIL FOOL cZ might lust 1st real still dont have WALSTON RETRIEVAL SYSTEM kind yourself disposition year Make flying season easier Call us now WALSTON RETRIEVAL SYSTEMS 725 Cooper Lake Rd SE Smyrna GA 30082 770-434-4905 800-657-4672 Fax 770-431-0119 Visa AmEx PRECISION FIBERGJ Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 9am 6 pm EDT7 ONALA HOBBY STORES ASSOCIA11O INC Send $1 00 catalog $200 Outside US Dept 3 2805 Big Bend Dr ville TN 37803 LOOK FOR YOUR LOCAL NRHSA HOBBY SHOP ON SITE EXPERT ADVICE AND INFORMATION QUALITY MODELING PRODUCTS WERE THERE WHEN YOU NEED US WHERE ELSE CAN YOU GET THAT GLOW PLUG ON SATURDAY MORNING AMA FAX APPLICATIONS AVAILABLE LOCAL CLUB NEWS AND HAPPENINGS PART OF NATIONWIDE ORGANIZATION WORKING FOR THE BETTERMENT OF THE HOBBY INDUSTRY HAVE YOU EVER RACED ON MAIL ORDER TRACK REMEMBER WHO GOT YOU STARTED IN R/C screw couldnt pull stab down further Much worse model also run out stall recovery CG back around 65% because water tail decalage difference incidence between wing stab incidence reduced model would recover stall hindsight should have left stab incidence alone added nose weight get rid stall glide got back home stripped 1/4-mil MylarTM covering off stab placed stab structure scale no visible moisture stab didnt feel damp recorded weight next day stab some 8 g lighter water evaporated Note stab carbon D box trailing edge balsa parts spar ribs Flying rain also taught few things about clothes other gear good rain suit must waterproof hat biggest problem reading glasses normally wear string around neck dont lose rain lenses hang parallel ground act like two small saucers collect raindrops finally resorted keeping pocket Visibility retrieval can problem rain heavy overcast Luckily calm conditions morning meant chases less 100 yards really nice watch model gliding circle right around launch point did have pair yellow sunglasses available necessary Favored shooters cut through haze increase contrast 4118 Model Aviation 4The Worlds Finest Laser Cut Rubber Powered Free Flight Scale Kits nrr worlds leader Laser Cut Model Aircraft Kits Engineering kft features finest LASER CUT BALSA PARTS Contest Rubber Detailed Computer Dabw7 Plans Corporation Complete Hardvere PacA Authentic Watersllde Decaib Molded PlastIc Propeller Real Colored TIssue Light Wwght Wheels Complete Step t Step Building Instruc*lons Please check local hobby dealer fireL kIts availabl better hobby shops around world 1431 Chaffee Dr Suite #3 Full Line catejag $200 Add $450 shipping khOverseas orders add 20%Fl residents add 6% sales tax Tltuavifle FL 32780 KMade USADealer inquires invited407 264-2488
Edition: Model Aviation - 1998/04
Page Numbers: 115, 116, 117, 118
FREE FLIGHT DURATION C02 MY YOUTHFUL memories CO2 motors somewhat limited remember seeing two around dont ever remember seeing air however remember Monogram C02-powered rocketit looked like V-2 didnt use motor just CO2 cartridge stuck back solid balsa model rocket ran horizontally along wire guided couple eye hooks body Lots fun During last few years Ive noticing considerable number articles about CO2 motors models several newsletters NFFS Digest Vol Libre articles work man Fritz Mueller Columbus Georgia articles have covered fine points loading tank get maximum amount liquid CO2 tank complete pressureversus-temperature graphs point Fritz stresses need keep CO2 models simple pieces detailed adaptation Lee Campbells popular Souper 30 P-30 kit use CO2 motor involves discarding rubber-model nose block prop temporarily strapping CO2 engine tank balance model proper CC center gravity engine mounted plywood former give four degrees downthrust degree right thrust top bottom bays just front pylon sheeted /32 balsa holes cut hold tank couldnt simpler Much Fritzs extensive knowledge CO2 comes conversations George Benedek Hungary Yes same Benedek developed wonderful Free Flight airfoils flew him contest talked shop home congenial wife Gisela cooked up delicious Hungarian meals writes Fritz Benedek won Jiri Smola Memorial CO2 competitions three years rowthe first against 140 competitors After Jiri Smola rules changed FiK formula give other competitors chance Now model square wings no tapers no geodesic ribs no folding prop would otherwise Fritz asks Rather rocket climbs used power models CO2 models climb like rubber model cruise portion unwinding curve means shallow climb around eight degrees relatively low power means no need auto surfaces other design engineering complications slow climb also means model doesnt need stiff structure required fast-climbing Wakefield power model rather mild power would make CO2 very good beginners class What CO2 motor may lack power makes up length motor run proper filling motor run excess two-minute flight maximum possible Coupled light wing loading models has lead some unusual DT dethermalizing techniques involving pop-up wings rotating rudders contest flyoffs contestant must start motor allow run ground set time much minute release model April 1998 115 American proponent CO2 Fritz Mueller prepares launch GM-63 powered model Wingspan 22 inches simple lightweight model George Benedek Hungary adjusts Modela-powered CO2 model Wing 1958 Wakefield placed fifth World Championships year Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller PAL Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstarnetcom effort reduce performance FiK class models rules changed last year include minimum weight maximum wing area tank size kept 3cc hut cooling tank charger permitted European response rules see drawing Kele X Fritzs own response favor simple P-30-style event minimum wingspan length rules information about C02 order GM-63 motor can contact Fritz directly Fritz Mueller 4117 Searcy Street Columbus GA 31907 Im sure stamped self-addressed envelope would appreciated Kele X latest issue French Free Flight magazine Vol Libre included clean FiK model Istvan Harsfalvi new rules international CO2 competition specify minimum weight 75 grams maximum projected surface area wing tail 12 sq din works out bit three ounces area about 186 square inches tank size limited 3cc Kele X has wingspan 1120mm about 44 inches wing area 1004 sq din about 155 square inches stab area 189 sq dm about 30 square inches 20% wing area model has several interesting structural features wing uses carbon-fiber D-box full-depth balsa spar instead open rear structure back portion wing sheeted top bottom 4 mm Depron entire stab sheeted 03 mm Depron extruded foam plastic material used Europe wall insulation So far have found source country Note wing spar doubled Perhaps wing panel built halves allow difference thickness between carbon D-box skin Join squadron Brand new squadron markings. Available L 4OO o- a44 1/8 1/6 & 1/4 scales Caa1 & Cooi CkaAt D Theres always thing new major decals29 works.squadron insinias NORTHEAST SCREEN GRAPHICS P0 BOX 304 EAST LONGMEAO0W MA 01028 TEL 413-525-4110 FAX 413-525-7794 116 Model Aviation il Benedeks model shows simple installation motor tank Fitting above engine filler tip used charge tank thicker Depron sheeting rear portion fuselage round crosssection made carbon Keviar 270mm diameter homemade prop turns around 1000 rpm very poor German correct bladed prop moderately high-aspect-ratio wing slender fuselage overall clean lines show obvious attempt drag reduction feel important often ignored factor Low drag especially important small lightly-loaded models get glide speed up enough move airfoil decent Reynolds number range Flying Rain Sunday last October crawled out bed three am loaded up car made three-hour drive Crawfordsville Georgia Thermal Thumbers Metro Atlantas Fall contest weather reports promising light rain falling got field Best absolutely no wind years since flown rain thought would good learning experience new plastic coverings really work well wet weather no sign sagging get Japanese tissue collect water Although wiped wing tail off between flights could tell model getting more tail-heavy typical Wakefield has center gravity around 55% tail moment arm around 900mm small stab As CG kept shifting aft stall started creeping glide did easy thing started pulling trailing edge stab down turned out wrong choice After few flights run out adjustment ALUMINUM CENTER STOCK NO 3000 K&S has added 28 new aluminum items its product line Aluminum Center features round square tubing rod sheet 12 lengths round tubes rods sheets 6061 -T6 aluminum alloy very strong lightweight square tubing 3003-H14 aluminum alloy very easy work carefully engineered line aluminum products has unlimited uses development types projects KS ENGINEERING 6917 W 59th Street ago IL 60638 773 586-8503 773 586-8556 VIDEO $995 L APPLIES 10 PURCHASE PRICE OF KIT KIT $26500 PLANS $3500 MUD DUCK AVIATION 7118 West moreland Dr WarrentonVA 20187 540 347-1134 April1998 117 Another Benedek model has inverted engine underslung tank Because low rpm molded plastic props can safely used CO2 See giant FLY SEND $100 FOR OUR FULL LINE CATALOG V APRIL FOOL cZ might lust 1st real still dont have WALSTON RETRIEVAL SYSTEM kind yourself disposition year Make flying season easier Call us now WALSTON RETRIEVAL SYSTEMS 725 Cooper Lake Rd SE Smyrna GA 30082 770-434-4905 800-657-4672 Fax 770-431-0119 Visa AmEx PRECISION FIBERGJ Hundreds cowls radial cowls & wheelpants Strong lightweight one-piece construction Exact duplicate manufacturers original Phone orders information call 423-984-0828 9am 6 pm EDT7 ONALA HOBBY STORES ASSOCIA11O INC Send $1 00 catalog $200 Outside US Dept 3 2805 Big Bend Dr ville TN 37803 LOOK FOR YOUR LOCAL NRHSA HOBBY SHOP ON SITE EXPERT ADVICE AND INFORMATION QUALITY MODELING PRODUCTS WERE THERE WHEN YOU NEED US WHERE ELSE CAN YOU GET THAT GLOW PLUG ON SATURDAY MORNING AMA FAX APPLICATIONS AVAILABLE LOCAL CLUB NEWS AND HAPPENINGS PART OF NATIONWIDE ORGANIZATION WORKING FOR THE BETTERMENT OF THE HOBBY INDUSTRY HAVE YOU EVER RACED ON MAIL ORDER TRACK REMEMBER WHO GOT YOU STARTED IN R/C screw couldnt pull stab down further Much worse model also run out stall recovery CG back around 65% because water tail decalage difference incidence between wing stab incidence reduced model would recover stall hindsight should have left stab incidence alone added nose weight get rid stall glide got back home stripped 1/4-mil MylarTM covering off stab placed stab structure scale no visible moisture stab didnt feel damp recorded weight next day stab some 8 g lighter water evaporated Note stab carbon D box trailing edge balsa parts spar ribs Flying rain also taught few things about clothes other gear good rain suit must waterproof hat biggest problem reading glasses normally wear string around neck dont lose rain lenses 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