Radio Control SPORT AEROBA TICS Ron Van Putte WANT TO SHARE several letters have received readers Usually letters contain questions can answer two letters arrived recently question have stumped doesnt ego bit good admit dont know answers questions about model aircraft aerodynamics can help modelers out itll make feel better first letter Cal Malinka Rialto CA wrote Read article January 1982 issue Model Aviation interest would like help correcting roll-yaw aerodynamic problem have en countered Top Flite Contender best sport flying models have owned has fault however As covered article rudder command given airplane rolls opposite direction Per article indicates wing should have dihedral wing per plans has no dihedral Some years back built 60-size Contender 2 di hedral wing panel worked fine far roll concerned did roll given rudder command did pitch down very severely scarey much up elevator necessary overcome downpitching effect Can give some ideas correct would like get 40-size Contender kit build sport flying can correct bad aerodynamic tendency have described As article mentions should enlarge fin underneath fuselage extend rudder below fuselage centerline that can done once used Contender investigate left yaw P factor effect try determine much contribution spiral slipstream has enlarged ventral fin underneath fuselage experiment noticed no difference left yaw during takeoff Im convinced effect mostly gyroscopic effect tail-dragger lifts uptheres hardly yaw tendency tricycle gear plane Unfortunately too dumb notice what effect large ventral fin roll effect giving rudder command strange pitching effect sometimes occurs rudder deflected has around some time first time heard about about 10 years ago Don Lowe asked what caused didnt have ready answer Don timeand still dont control problems able uncouple symmetric control aircraft motion pitch nonsymmetric controls motions roll yaw example dont expect aircraft roll yaw deflect elevator same way rudder deflection usually doesnt cause airplane pitch Un fortunately sometimes does prob ably factors cause airplane pitch rudder deflected including effect wing fuselage sidewash horizontal tail sideslip effect propeller wake both wing horizontal tail sideslip direct effect change airflow over horizontal tail due rudder de flection really dont know some airplanes pitch rudder deflected others dont someone has some good information subject about sharing rest us would great someone systematic process eliminating unwanted pitch rudder deflected wouldnt have excuses lousy-looking point rolls other hand wed have blame lousy flying Hmmm about second letter containing oroblem dont have surefire answer came Charlie Rector Fredericksburg VA said am writing see can help trim problem have run across couple times can find no explanation solution Two aircraft Sig Kavalier RCM Trainer 40 extremely sensitive elevator trim sensitive click trim lever will change aircrafts attitude climb dive Kavalier built Sig kit Trainer 40 Name Brand ab kits Both fly well exhibit no bad habits other sensitive trim have other Kavaliers Trainer 40s club response trim what would normally expect have tried shifting CG forward increasing incidence wingand did little good tried desensitizing elevator movement thing ac complished ran out up elevator landings Neither radio has excessive amount servo movement trim have RC around 20 years have learned little about trimming aircraft two have rest club stumped have no problem flying either ship 44 Model Aviation absolutely gorgeous Curare lastyears Baton Rouge LA contest Too bad cant have color photoB&W doesnt justice Builder Bill Johnston Prattyille AL Heres great team father Alan Joflncock tiles master class son Mlcnael rues xperr usually share same airplane contests around Texas City TX home base since normally trim aircraft descend slightly am always holding little back pressure stick However aircraft belong novices have very difficult time just flying level can shed light cause cure problem please let know Boy really stuck box didnt started reading letter sure would simple suggest several probable causes problem would lead easy solution However Charlie systematically cov ered almost fixes would try have left doesnt work Im out solution business about rest Remember airplane designs have flown successfully hundreds other modelers cant problem inherent design rest mulling over problem will have written last solution Charlie Rector hope works Just case bombs out about writing solution Also just case solution works Im going give now Quite few years ago remember Len Purdy similar problem Lanier aircraft designs squared off trailing edge elevators virtually elimin ated trim sensitivity retaining control effectiveness moderate-to-large control deflections sharp trailing edge elevator will necessarily make elevator trim smooth linear way trailing edge sharpness obtained often causes what called airflow separation elevator side other depending whether elevator trimmed up down turn causes large changes pitching moment acting airplane trailing edge elevator squared off elevator trim sensitivity decreases because airflow separation triggered trailing edge hope right solution Charlie Rectors problem Ill let know meantime please send solutions would like share rest us last letter Id like share contained solution rather problem should substantial general interest came Dick SnyderDallastown PA wrote Meant write few months ago mentioned about high fuel consumption using pipe went through couple years ago OS Max Supertigres Webras would just get through Expert pattern made long turnarounds might flame out about Spin time before started using 5% nitro fuel Cool Power did fuel mileage increase power did too Continued page 108 May 198245 Scale Stop Sign Bob Talley Unique craft fabricated 1-in Styrofoam engine quit glide ratio approximated light brick Elerons gave tremendous roll rate BUY DIRECT SAVE OVER 50% COMPLETE MODELERS ASSORTMENT OF FASTENERS MAY1981 NEWATYOURFINoERTEPSI~* RETAIL PRICE SURVEY **SHOWED ALLOY PARTS WITH *NEVER OFFERED BEFORE!**NO ORGANIZER AT OVER FIFTY * NO MORE SPECIAL TRIPS TO THE **OOLLARS THAN TWICE OUR* * HOBBY STORE IF IT IS OPEN**$2495* HSA-735 ALLOY STEEL SOCKET HEAD CAP SCREWS CONTENTS LISTPCS 256316 SOCKET HEAD CAP SCREW 25 256 4 SOCKET HEAD CAP SCREW 25 256 1 2 SOCKET HEAD CAP SCREW 25 4-401 4 SOCKET HEAD CAP SCREW 20 4-401 2 SOCKET HEAD CAP SCREW 29 2 440 OCKET HEAD CAP SCREW 20 440 1 SOCKET HEAD CAP SCREW 20 632 14 SOCKET HEAD CAP SCREW IS 632 2 SOCKET HEAD CAP SCREW 15 63239 SOCKET HEAD CAP SCREW 15 632 1 SOCKET HEAD CAP SCREW 15 6-32 1 SOCKET HEAD CAP SCREW15 6322 SOCKET HEAD CAP SCREW 15 IllliI6Vi FIllY I5A48s5i1— USA-agO ALLOY ASSORTMENT SHOWN Mail Order To * Please inolude S250 postage HARDWARE SYSTEMS * handlIng 7428Add $150 COD Washngtn Ave * Ming residants add 5% sales las Eden Pealrle MInn 55344* Orders will shipped withlng 48 Phone 8124416757 hours FLAT WASHERS SAE ZINC PLATED 4 75 65 95 75 85 05 TOTAL PCS 735 * ** *** ** ** ** * **** *** * KITSCOME COMPLETE WITH iS COMPARTMENT HEAVY DUTY INDUSTRIAL ORGANIZER * * * * * * * *A ***A ** * * ** ** ** A** ** ONLY $2495 IIEAT LAKES tOIEI & XIOU AII5ANDICK MAHER First Time POST OFFICE BOX 308THOMAS J MAHER TAWAS CITY MICHIGAN 48763 Advertised TELEPHONE 517 362-6078 AxIPSIUF (NSTRI Ii N 44~ SNJ HARVARD 633/8 Span 0 Power $18800 P4 SCALE IizzL2 1AICHIO3AITYPE99VAL 705 Span 60 90 POWer $22500 WE THINK YOU WILL AGREE THAT THEY ARE THE BEST NAWLLTD KITS YET FUSALAGE WINGS TAIL SURFACES WHITE EPOXY FINISH READY FOR PAINTS DETAILING EURATHANE FOAM RIGIDLY SUPPORTS EPOXY GELL COAT FIBERGLASS REINFORCED AT STRESS POINTS ONLY ASSEMBLY INSTALLATION OF EGUIPMENT & PAINTING REDUIRED SCALE WHEELS INCLUDED NO NEED TO COVER WITH BALSA SHEET OR FILM SUPERIOR PRODUCT WEole Lot LeIt Do CLUBS CHECK OUT OUR SPECIAL INTRODUCTORY OFFER FEATURES INCLUDE Space battery & meter panel Transmitter compartment Room gallon fuel MASTER AIRSCREW FLIGHTBOX KIT Master Airscrew Flight Box has features larger boxes compact handy arrangement parts cut imported mahogany plywood will take stain varnish paint finishes overall size l9Ysx 9Y2x 12 high $3at dealer 495 postpaid California add 6% Sales Tax Propeller storage Gravity closed small parts storage 7/8 aluminum handle e Complete instructions & fasteners WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 NYLON INSERT LOCK NUTS ZINC PLATED 258 440 632 models vary wing loading 16 37 ox per sq ft wing area Except slow-flight Capabilities lightly-loaded models problems wind Cant really see lot difference degree flight difficulty spot landing missed overshooting just likely heavy jobs floats too high altitude real difference difficulty seems result lack practice flying field avoid flight difficulty greatest benefit comes having reliable trainer flies Scalemodel characteristics pouring gallons fuel through its engine Bob Dolly Wiseher RL 1 S-221 Lapham Peak Roa4 Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 45 rpms ground about same vertical maneuvers lot power OS Max can fly full Masters pattern three maneuvers before have come theres usually ounce left original 16 So youre using higher nitro fuel am10% R VP try cutting back rushed out Sears got Some filled epoxy See February column R VP Works great Ive often wondered someone didnt Its really expensive either After receiving nice comment about Sears epoxy feeling pretty good until other night got long distance call Bud Wolfe Scottsdale AZ told people Sears store never heard it wasnt listed regional distribu toTs record books So apparently Sears filled epoxy isnt available everywhere However have purchased Dayton OH Washington DC booming metropolis Fort Walton Beach FL Since Bud went trouble letting know couldnt buy lived went local Sears store bought two packages sent him Now has package use take local Sears show what talking about Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 FLYING NEAR AIRPORTS BE CAREFUL 108 Model Aviation tICS Scale Hasters East Coast Scale Masters Qualifier orGES RAOIO CONmOL Bowie Maryland June 2-27 1982 Stand-Off Scale t Scale Registration 830- 1000 Superb Paved Flying Site Camping Field Excellent Prizes Tom Bayne CD 301 627-5118 17102 Earlham Ct Upper Marlboro MD 20772
Edition: Model Aviation - 1982/05
Page Numbers: 44, 45, 108
Radio Control SPORT AEROBA TICS Ron Van Putte WANT TO SHARE several letters have received readers Usually letters contain questions can answer two letters arrived recently question have stumped doesnt ego bit good admit dont know answers questions about model aircraft aerodynamics can help modelers out itll make feel better first letter Cal Malinka Rialto CA wrote Read article January 1982 issue Model Aviation interest would like help correcting roll-yaw aerodynamic problem have en countered Top Flite Contender best sport flying models have owned has fault however As covered article rudder command given airplane rolls opposite direction Per article indicates wing should have dihedral wing per plans has no dihedral Some years back built 60-size Contender 2 di hedral wing panel worked fine far roll concerned did roll given rudder command did pitch down very severely scarey much up elevator necessary overcome downpitching effect Can give some ideas correct would like get 40-size Contender kit build sport flying can correct bad aerodynamic tendency have described As article mentions should enlarge fin underneath fuselage extend rudder below fuselage centerline that can done once used Contender investigate left yaw P factor effect try determine much contribution spiral slipstream has enlarged ventral fin underneath fuselage experiment noticed no difference left yaw during takeoff Im convinced effect mostly gyroscopic effect tail-dragger lifts uptheres hardly yaw tendency tricycle gear plane Unfortunately too dumb notice what effect large ventral fin roll effect giving rudder command strange pitching effect sometimes occurs rudder deflected has around some time first time heard about about 10 years ago Don Lowe asked what caused didnt have ready answer Don timeand still dont control problems able uncouple symmetric control aircraft motion pitch nonsymmetric controls motions roll yaw example dont expect aircraft roll yaw deflect elevator same way rudder deflection usually doesnt cause airplane pitch Un fortunately sometimes does prob ably factors cause airplane pitch rudder deflected including effect wing fuselage sidewash horizontal tail sideslip effect propeller wake both wing horizontal tail sideslip direct effect change airflow over horizontal tail due rudder de flection really dont know some airplanes pitch rudder deflected others dont someone has some good information subject about sharing rest us would great someone systematic process eliminating unwanted pitch rudder deflected wouldnt have excuses lousy-looking point rolls other hand wed have blame lousy flying Hmmm about second letter containing oroblem dont have surefire answer came Charlie Rector Fredericksburg VA said am writing see can help trim problem have run across couple times can find no explanation solution Two aircraft Sig Kavalier RCM Trainer 40 extremely sensitive elevator trim sensitive click trim lever will change aircrafts attitude climb dive Kavalier built Sig kit Trainer 40 Name Brand ab kits Both fly well exhibit no bad habits other sensitive trim have other Kavaliers Trainer 40s club response trim what would normally expect have tried shifting CG forward increasing incidence wingand did little good tried desensitizing elevator movement thing ac complished ran out up elevator landings Neither radio has excessive amount servo movement trim have RC around 20 years have learned little about trimming aircraft two have rest club stumped have no problem flying either ship 44 Model Aviation absolutely gorgeous Curare lastyears Baton Rouge LA contest Too bad cant have color photoB&W doesnt justice Builder Bill Johnston Prattyille AL Heres great team father Alan Joflncock tiles master class son Mlcnael rues xperr usually share same airplane contests around Texas City TX home base since normally trim aircraft descend slightly am always holding little back pressure stick However aircraft belong novices have very difficult time just flying level can shed light cause cure problem please let know Boy really stuck box didnt started reading letter sure would simple suggest several probable causes problem would lead easy solution However Charlie systematically cov ered almost fixes would try have left doesnt work Im out solution business about rest Remember airplane designs have flown successfully hundreds other modelers cant problem inherent design rest mulling over problem will have written last solution Charlie Rector hope works Just case bombs out about writing solution Also just case solution works Im going give now Quite few years ago remember Len Purdy similar problem Lanier aircraft designs squared off trailing edge elevators virtually elimin ated trim sensitivity retaining control effectiveness moderate-to-large control deflections sharp trailing edge elevator will necessarily make elevator trim smooth linear way trailing edge sharpness obtained often causes what called airflow separation elevator side other depending whether elevator trimmed up down turn causes large changes pitching moment acting airplane trailing edge elevator squared off elevator trim sensitivity decreases because airflow separation triggered trailing edge hope right solution Charlie Rectors problem Ill let know meantime please send solutions would like share rest us last letter Id like share contained solution rather problem should substantial general interest came Dick SnyderDallastown PA wrote Meant write few months ago mentioned about high fuel consumption using pipe went through couple years ago OS Max Supertigres Webras would just get through Expert pattern made long turnarounds might flame out about Spin time before started using 5% nitro fuel Cool Power did fuel mileage increase power did too Continued page 108 May 198245 Scale Stop Sign Bob Talley Unique craft fabricated 1-in Styrofoam engine quit glide ratio approximated light brick Elerons gave tremendous roll rate BUY DIRECT SAVE OVER 50% COMPLETE MODELERS ASSORTMENT OF FASTENERS MAY1981 NEWATYOURFINoERTEPSI~* RETAIL PRICE SURVEY **SHOWED ALLOY PARTS WITH *NEVER OFFERED BEFORE!**NO ORGANIZER AT OVER FIFTY * NO MORE SPECIAL TRIPS TO THE **OOLLARS THAN TWICE OUR* * HOBBY STORE IF IT IS OPEN**$2495* HSA-735 ALLOY STEEL SOCKET HEAD CAP SCREWS CONTENTS LISTPCS 256316 SOCKET HEAD CAP SCREW 25 256 4 SOCKET HEAD CAP SCREW 25 256 1 2 SOCKET HEAD CAP SCREW 25 4-401 4 SOCKET HEAD CAP SCREW 20 4-401 2 SOCKET HEAD CAP SCREW 29 2 440 OCKET HEAD CAP SCREW 20 440 1 SOCKET HEAD CAP SCREW 20 632 14 SOCKET HEAD CAP SCREW IS 632 2 SOCKET HEAD CAP SCREW 15 63239 SOCKET HEAD CAP SCREW 15 632 1 SOCKET HEAD CAP SCREW 15 6-32 1 SOCKET HEAD CAP SCREW15 6322 SOCKET HEAD CAP SCREW 15 IllliI6Vi FIllY I5A48s5i1— USA-agO ALLOY ASSORTMENT SHOWN Mail Order To * Please inolude S250 postage HARDWARE SYSTEMS * handlIng 7428Add $150 COD Washngtn Ave * Ming residants add 5% sales las Eden Pealrle MInn 55344* Orders will shipped withlng 48 Phone 8124416757 hours FLAT WASHERS SAE ZINC PLATED 4 75 65 95 75 85 05 TOTAL PCS 735 * ** *** ** ** ** * **** *** * KITSCOME COMPLETE WITH iS COMPARTMENT HEAVY DUTY INDUSTRIAL ORGANIZER * * * * * * * *A ***A ** * * ** ** ** A** ** ONLY $2495 IIEAT LAKES tOIEI & XIOU AII5ANDICK MAHER First Time POST OFFICE BOX 308THOMAS J MAHER TAWAS CITY MICHIGAN 48763 Advertised TELEPHONE 517 362-6078 AxIPSIUF (NSTRI Ii N 44~ SNJ HARVARD 633/8 Span 0 Power $18800 P4 SCALE IizzL2 1AICHIO3AITYPE99VAL 705 Span 60 90 POWer $22500 WE THINK YOU WILL AGREE THAT THEY ARE THE BEST NAWLLTD KITS YET FUSALAGE WINGS TAIL SURFACES WHITE EPOXY FINISH READY FOR PAINTS DETAILING EURATHANE FOAM RIGIDLY SUPPORTS EPOXY GELL COAT FIBERGLASS REINFORCED AT STRESS POINTS ONLY ASSEMBLY INSTALLATION OF EGUIPMENT & PAINTING REDUIRED SCALE WHEELS INCLUDED NO NEED TO COVER WITH BALSA SHEET OR FILM SUPERIOR PRODUCT WEole Lot LeIt Do CLUBS CHECK OUT OUR SPECIAL INTRODUCTORY OFFER FEATURES INCLUDE Space battery & meter panel Transmitter compartment Room gallon fuel MASTER AIRSCREW FLIGHTBOX KIT Master Airscrew Flight Box has features larger boxes compact handy arrangement parts cut imported mahogany plywood will take stain varnish paint finishes overall size l9Ysx 9Y2x 12 high $3at dealer 495 postpaid California add 6% Sales Tax Propeller storage Gravity closed small parts storage 7/8 aluminum handle e Complete instructions & fasteners WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 NYLON INSERT LOCK NUTS ZINC PLATED 258 440 632 models vary wing loading 16 37 ox per sq ft wing area Except slow-flight Capabilities lightly-loaded models problems wind Cant really see lot difference degree flight difficulty spot landing missed overshooting just likely heavy jobs floats too high altitude real difference difficulty seems result lack practice flying field avoid flight difficulty greatest benefit comes having reliable trainer flies Scalemodel characteristics pouring gallons fuel through its engine Bob Dolly Wiseher RL 1 S-221 Lapham Peak Roa4 Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 45 rpms ground about same vertical maneuvers lot power OS Max can fly full Masters pattern three maneuvers before have come theres usually ounce left original 16 So youre using higher nitro fuel am10% R VP try cutting back rushed out Sears got Some filled epoxy See February column R VP Works great Ive often wondered someone didnt Its really expensive either After receiving nice comment about Sears epoxy feeling pretty good until other night got long distance call Bud Wolfe Scottsdale AZ told people Sears store never heard it wasnt listed regional distribu toTs record books So apparently Sears filled epoxy isnt available everywhere However have purchased Dayton OH Washington DC booming metropolis Fort Walton Beach FL Since Bud went trouble letting know couldnt buy lived went local Sears store bought two packages sent him Now has package use take local Sears show what talking about Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 FLYING NEAR AIRPORTS BE CAREFUL 108 Model Aviation tICS Scale Hasters East Coast Scale Masters Qualifier orGES RAOIO CONmOL Bowie Maryland June 2-27 1982 Stand-Off Scale t Scale Registration 830- 1000 Superb Paved Flying Site Camping Field Excellent Prizes Tom Bayne CD 301 627-5118 17102 Earlham Ct Upper Marlboro MD 20772
Edition: Model Aviation - 1982/05
Page Numbers: 44, 45, 108
Radio Control SPORT AEROBA TICS Ron Van Putte WANT TO SHARE several letters have received readers Usually letters contain questions can answer two letters arrived recently question have stumped doesnt ego bit good admit dont know answers questions about model aircraft aerodynamics can help modelers out itll make feel better first letter Cal Malinka Rialto CA wrote Read article January 1982 issue Model Aviation interest would like help correcting roll-yaw aerodynamic problem have en countered Top Flite Contender best sport flying models have owned has fault however As covered article rudder command given airplane rolls opposite direction Per article indicates wing should have dihedral wing per plans has no dihedral Some years back built 60-size Contender 2 di hedral wing panel worked fine far roll concerned did roll given rudder command did pitch down very severely scarey much up elevator necessary overcome downpitching effect Can give some ideas correct would like get 40-size Contender kit build sport flying can correct bad aerodynamic tendency have described As article mentions should enlarge fin underneath fuselage extend rudder below fuselage centerline that can done once used Contender investigate left yaw P factor effect try determine much contribution spiral slipstream has enlarged ventral fin underneath fuselage experiment noticed no difference left yaw during takeoff Im convinced effect mostly gyroscopic effect tail-dragger lifts uptheres hardly yaw tendency tricycle gear plane Unfortunately too dumb notice what effect large ventral fin roll effect giving rudder command strange pitching effect sometimes occurs rudder deflected has around some time first time heard about about 10 years ago Don Lowe asked what caused didnt have ready answer Don timeand still dont control problems able uncouple symmetric control aircraft motion pitch nonsymmetric controls motions roll yaw example dont expect aircraft roll yaw deflect elevator same way rudder deflection usually doesnt cause airplane pitch Un fortunately sometimes does prob ably factors cause airplane pitch rudder deflected including effect wing fuselage sidewash horizontal tail sideslip effect propeller wake both wing horizontal tail sideslip direct effect change airflow over horizontal tail due rudder de flection really dont know some airplanes pitch rudder deflected others dont someone has some good information subject about sharing rest us would great someone systematic process eliminating unwanted pitch rudder deflected wouldnt have excuses lousy-looking point rolls other hand wed have blame lousy flying Hmmm about second letter containing oroblem dont have surefire answer came Charlie Rector Fredericksburg VA said am writing see can help trim problem have run across couple times can find no explanation solution Two aircraft Sig Kavalier RCM Trainer 40 extremely sensitive elevator trim sensitive click trim lever will change aircrafts attitude climb dive Kavalier built Sig kit Trainer 40 Name Brand ab kits Both fly well exhibit no bad habits other sensitive trim have other Kavaliers Trainer 40s club response trim what would normally expect have tried shifting CG forward increasing incidence wingand did little good tried desensitizing elevator movement thing ac complished ran out up elevator landings Neither radio has excessive amount servo movement trim have RC around 20 years have learned little about trimming aircraft two have rest club stumped have no problem flying either ship 44 Model Aviation absolutely gorgeous Curare lastyears Baton Rouge LA contest Too bad cant have color photoB&W doesnt justice Builder Bill Johnston Prattyille AL Heres great team father Alan Joflncock tiles master class son Mlcnael rues xperr usually share same airplane contests around Texas City TX home base since normally trim aircraft descend slightly am always holding little back pressure stick However aircraft belong novices have very difficult time just flying level can shed light cause cure problem please let know Boy really stuck box didnt started reading letter sure would simple suggest several probable causes problem would lead easy solution However Charlie systematically cov ered almost fixes would try have left doesnt work Im out solution business about rest Remember airplane designs have flown successfully hundreds other modelers cant problem inherent design rest mulling over problem will have written last solution Charlie Rector hope works Just case bombs out about writing solution Also just case solution works Im going give now Quite few years ago remember Len Purdy similar problem Lanier aircraft designs squared off trailing edge elevators virtually elimin ated trim sensitivity retaining control effectiveness moderate-to-large control deflections sharp trailing edge elevator will necessarily make elevator trim smooth linear way trailing edge sharpness obtained often causes what called airflow separation elevator side other depending whether elevator trimmed up down turn causes large changes pitching moment acting airplane trailing edge elevator squared off elevator trim sensitivity decreases because airflow separation triggered trailing edge hope right solution Charlie Rectors problem Ill let know meantime please send solutions would like share rest us last letter Id like share contained solution rather problem should substantial general interest came Dick SnyderDallastown PA wrote Meant write few months ago mentioned about high fuel consumption using pipe went through couple years ago OS Max Supertigres Webras would just get through Expert pattern made long turnarounds might flame out about Spin time before started using 5% nitro fuel Cool Power did fuel mileage increase power did too Continued page 108 May 198245 Scale Stop Sign Bob Talley Unique craft fabricated 1-in Styrofoam engine quit glide ratio approximated light brick Elerons gave tremendous roll rate BUY DIRECT SAVE OVER 50% COMPLETE MODELERS ASSORTMENT OF FASTENERS MAY1981 NEWATYOURFINoERTEPSI~* RETAIL PRICE SURVEY **SHOWED ALLOY PARTS WITH *NEVER OFFERED BEFORE!**NO ORGANIZER AT OVER FIFTY * NO MORE SPECIAL TRIPS TO THE **OOLLARS THAN TWICE OUR* * HOBBY STORE IF IT IS OPEN**$2495* HSA-735 ALLOY STEEL SOCKET HEAD CAP SCREWS CONTENTS LISTPCS 256316 SOCKET HEAD CAP SCREW 25 256 4 SOCKET HEAD CAP SCREW 25 256 1 2 SOCKET HEAD CAP SCREW 25 4-401 4 SOCKET HEAD CAP SCREW 20 4-401 2 SOCKET HEAD CAP SCREW 29 2 440 OCKET HEAD CAP SCREW 20 440 1 SOCKET HEAD CAP SCREW 20 632 14 SOCKET HEAD CAP SCREW IS 632 2 SOCKET HEAD CAP SCREW 15 63239 SOCKET HEAD CAP SCREW 15 632 1 SOCKET HEAD CAP SCREW 15 6-32 1 SOCKET HEAD CAP SCREW15 6322 SOCKET HEAD CAP SCREW 15 IllliI6Vi FIllY I5A48s5i1— USA-agO ALLOY ASSORTMENT SHOWN Mail Order To * Please inolude S250 postage HARDWARE SYSTEMS * handlIng 7428Add $150 COD Washngtn Ave * Ming residants add 5% sales las Eden Pealrle MInn 55344* Orders will shipped withlng 48 Phone 8124416757 hours FLAT WASHERS SAE ZINC PLATED 4 75 65 95 75 85 05 TOTAL PCS 735 * ** *** ** ** ** * **** *** * KITSCOME COMPLETE WITH iS COMPARTMENT HEAVY DUTY INDUSTRIAL ORGANIZER * * * * * * * *A ***A ** * * ** ** ** A** ** ONLY $2495 IIEAT LAKES tOIEI & XIOU AII5ANDICK MAHER First Time POST OFFICE BOX 308THOMAS J MAHER TAWAS CITY MICHIGAN 48763 Advertised TELEPHONE 517 362-6078 AxIPSIUF (NSTRI Ii N 44~ SNJ HARVARD 633/8 Span 0 Power $18800 P4 SCALE IizzL2 1AICHIO3AITYPE99VAL 705 Span 60 90 POWer $22500 WE THINK YOU WILL AGREE THAT THEY ARE THE BEST NAWLLTD KITS YET FUSALAGE WINGS TAIL SURFACES WHITE EPOXY FINISH READY FOR PAINTS DETAILING EURATHANE FOAM RIGIDLY SUPPORTS EPOXY GELL COAT FIBERGLASS REINFORCED AT STRESS POINTS ONLY ASSEMBLY INSTALLATION OF EGUIPMENT & PAINTING REDUIRED SCALE WHEELS INCLUDED NO NEED TO COVER WITH BALSA SHEET OR FILM SUPERIOR PRODUCT WEole Lot LeIt Do CLUBS CHECK OUT OUR SPECIAL INTRODUCTORY OFFER FEATURES INCLUDE Space battery & meter panel Transmitter compartment Room gallon fuel MASTER AIRSCREW FLIGHTBOX KIT Master Airscrew Flight Box has features larger boxes compact handy arrangement parts cut imported mahogany plywood will take stain varnish paint finishes overall size l9Ysx 9Y2x 12 high $3at dealer 495 postpaid California add 6% Sales Tax Propeller storage Gravity closed small parts storage 7/8 aluminum handle e Complete instructions & fasteners WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 NYLON INSERT LOCK NUTS ZINC PLATED 258 440 632 models vary wing loading 16 37 ox per sq ft wing area Except slow-flight Capabilities lightly-loaded models problems wind Cant really see lot difference degree flight difficulty spot landing missed overshooting just likely heavy jobs floats too high altitude real difference difficulty seems result lack practice flying field avoid flight difficulty greatest benefit comes having reliable trainer flies Scalemodel characteristics pouring gallons fuel through its engine Bob Dolly Wiseher RL 1 S-221 Lapham Peak Roa4 Delafleld WI 53018 RC Aerobatics/Van Putte Continued page 45 rpms ground about same vertical maneuvers lot power OS Max can fly full Masters pattern three maneuvers before have come theres usually ounce left original 16 So youre using higher nitro fuel am10% R VP try cutting back rushed out Sears got Some filled epoxy See February column R VP Works great Ive often wondered someone didnt Its really expensive either After receiving nice comment about Sears epoxy feeling pretty good until other night got long distance call Bud Wolfe Scottsdale AZ told people Sears store never heard it wasnt listed regional distribu toTs record books So apparently Sears filled epoxy isnt available everywhere However have purchased Dayton OH Washington DC booming metropolis Fort Walton Beach FL Since Bud went trouble letting know couldnt buy lived went local Sears store bought two packages sent him Now has package use take local Sears show what talking about Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 FLYING NEAR AIRPORTS BE CAREFUL 108 Model Aviation tICS Scale Hasters East Coast Scale Masters Qualifier orGES RAOIO CONmOL Bowie Maryland June 2-27 1982 Stand-Off Scale t Scale Registration 830- 1000 Superb Paved Flying Site Camping Field Excellent Prizes Tom Bayne CD 301 627-5118 17102 Earlham Ct Upper Marlboro MD 20772