Bi isq& Sa Scratch-buIldIng WE Plan N Pattern sets way go get beet designs com plete Full-Size layouts parts drawings bill mater lais save up 50% over comparable kit costs Quarter Scale R/C World Wan SE-5A 80A Wingspan- 0 2220 sq area 78 22 Engines Plan N Pattern Set RCQS-7.. $2495 SPAD C-Xlll World Wan Capable Flyer Captures Imagination 79/a Wingspan 2120 sq area 13 31 Engines Plan N Pattern Set RCQS-8.. $2795 FOKKER TRIPLANE DR-I 72 Wingspan 1772 sq area 78 150 Engines Plan N Pattern Set RCQS-8.. $2495 Quarter Scale-Golden Age Curtis Falcon 114 Wingspan- 3158 sq area Quadra Size Engine Plan N Pattern Set RCQS-13.. $2795 1/6 Scale-Golden Age French Mureau C-I 58 Wingspan 450 sq area Plan N Pattern Set RC8S-1$1295 Puss Moth 724 WinnoianARfl orn WACO SRE Cabin Biplane R/C 521/2 Wingspan 640 sq areaFor 19 40 Engines Plan N Pattern Set RC8S-3$1295 Best Ducted Fans SKYRAY F4D-l Plan Form 1 Scale Duct Fan RIC RK-20 Fan Unit Plan N Pattern Set RCD F-i$1995 Bill Efliqer Fasadleg Member AMA NFFS 1111sf Ismer Prices Complete Plans Sub Assembly Detailed Parts Lists Add $200 Mailing Tube SEND FOR BROcHURE ahead crowd New Brochure showing new Plan Sets 1988 Send *100 its ref undable first orderl WE Technical Services PO Box 76884-A Atlanta GA 30328 Piper Skycycle author Ken Wilson commended excellent Piper Skycycle article March issue Model Aviation Up until now heard few mentions airplane unaware ever kitted model manufacturers past acquired set plans Skycycle Cleve land Co some years ago extent knowledge model interesting facts Mr Wilson described certainly held interest Its obvious Piper Skycycle plane designed before its time marketed today especially kit form probably would business success Im looking forward seeing someone publish plans RC model fol lowing article Ken Wilson Alvin E Johnson Oxford PA More Airfoils Moments feel should respond Mr Brownlees remarks critique article letter editor February issue letter confuses Aerody namic Center AC Center Pressure CP Aerodynamic Cen ter about no movement symmetrical section small con stant negative moment cambered section CP simply point through resultant lift vector enve lope acts. other words lift acts given angle attack cambered sections CP does move. aft decreases angle attack forward increases angle attack Secondly some upturned elevon Clark Y section can suitable tailless configuration long CG properly placed After reading letter am still wonder ing what tried say Brad Powers San Diego CA must congratulate excel lent choice printed Mr Brownlees letter February 1986 issue Continued page 10 1 0 1 * U 0 0 0z z U 0 IA U hi -I z U LII w z -I U IL U -J 0 0 z U 0 U 0 S U $129 Plus $ 50 Postage Handling Available Dealer CE 8 Model Aviation Letters Editor letters will carefully considered general interest used Send Mod 1 Aviation 1810 Samuel Morse Dr Reston VA 22090 Plan N Pattern Set RC5S-~14ib NJ Its Listed Need See hobby shop order direct $075 Price $795 plus $180 UPS total ign air mail 5 $795 plus $5501 US dollars please Send Check MO Credit Card info Consumers Guide 150 Ott St Harrisonburg VA 22801 C 703 4340350 Nlno Address Charge Card No MC VISA CIIAICFI MasterCard lB # _____________________ Expiration SinnAri Model Aviation although did surprise bit see type letter otherwise excellent letter however sentence particular bothers namely says CP moment zero sort language feel would appropriate talking about chordwise bending stresses wing panel picture what meant force must applied wing panel balance lift force strategi cally located will also balance pitch ing moment location such force called center pressure mo ments taken about point will add up zero could stop right might feel am nitpicking So will add regardless what point chosen take moments about will add up zero Therefore CP unique point respect also feel sooner CP concept buried forgotten about better concerned James E Brock Amboy WA Another MAP Conversion compliments Dick Sarpolus Bernie Raad excellent Model Anal ysis Program January 1986 issue took some mystery out model parameters However though program operation rather straight forward little awkward use repeated calculations uses lot paper understandable since intended bare bones program So after couple runs wrote updated version Atari computer allows make repeated calculations prints out data ready probably several modelers out would like use Model Analysis Program finding origi nal little difficult work am therefore making version available 5-in diskette anyone inter ested no charge program system requirements follows Atari computer except new 5205T least 32K memory disk drive compatible printer interface Since program does use special commands should work print ers would like try program send SASE blank disk Please allow room written instruc tions included Atari version MAP will added disk returned addition features men tioned above special file will added will allow program load run automatically Hopefully will make easier less computer experience would best enclose disk sturdy mailing envelopes made purpose Please make sure Continued page 12 10 Model Aviation Consumers Guide Radio Control Products THIRD EDITION ished Oct 11985 What happens famous STICK combined St Croix quality CANARD-PUSHER configuration S imply EASIEST-TO-BUILD BESTFLYING canard airplane available high quality wood parts kit precision cut EASY TO ASSEMBLE great instructions plans youll canard flying just few days Plus thoroughly tested aerodynamic perfor mance assures airplane will easy fly LOADS OF FUN Fly bare bones have fun customiz make very own Star Wars ship Now can join CANARD REVOLU TION easy way.at price can afford Tell dealer went experience fun canard flying Its easiest best available call 800-626-7042 toil free ORDERS ONLY ST CROIX MODELS OX 279 FALLS WI 54552 details other Zimbabwe Model Products kits call write Full color deluxe catalog -$100 ZIMPRO MARKETING disk blank contains files will returned unchanged hope people will find program useful encourage program mers some other personal com puters join help fellow modelers Remember share knowledge everyone benefits Ken Rusnok PO Box 116 W Chicago IL 60185 An Era Stormy Flying Dont ask happened really dont know ended up President focus show Started out publicity made progress incremental stages newspaper radio TV contacts listed Yellow Pages some super contests always good crowds RC planes thrilling maneuvering through clouds generated much revenue colorful aerobatic display wish could today didnt happen way distant yellow ranch house dissenting person appeared Right middle contest spectator cheered lone complainer red hair abra sive could last words said Youre gonna hear Shortly thereafter via Registered Mail believe Town Board sent us letter asking us leave field nine years tenure best state almost heart attack tensions began grate combat contest gained knowledge club clearance Shortly thereafter byjamming frequencies proceeded destroy nine beloved airplanes now wasnt uneeded Consider time involved building detail plane personal loss significant sustained great personal pain planning engineering high materials cost suffered tremendously equip ment totally lost intelligently reacted staging out posts several sectors directional radio receivers docu ment interference vectors vectors defined cause problem hampers radio equipment functioning source Mr S PO BOX 3076 OAK RIDGE TENNESSEE 37830 Tel 615 482-6188Continued page 139 SPAN 60 Fi nroq 35-45 req 4Chan FOAM WING CORES PRECISION MADE EXPANDED BEAD POLYSTYRENE REPLACEMENT WING & STAB CORES FOR ALL POPULAR R/C AIRCRAFT OVER 250 DIFFERENT WINGS IN STOCK FOR IMMEDIATE DELI VER SO IF YOU HAVE FAVORITE BIRD THAT NEEDS WING CALL OR CRYSTAL CLEAR THERMOFORMED CANOPIES DRESS UP YOUR PLANE WITH NEW CANOPY FROM WING MFG TOP QUALITY TOOLING & MATERIAL MAKES THESE SECOND TO NONE WE HAVE LOTS OF SHAPES & SIZES IN STOCK WHICH FIT MOST KITS & RA SCRATCH BUILT MODELS WING MFG P0 BOX 33 cRYsTAL LAKE IL 60014 Phone 815/459-0417 VISIT OUR OUTLET STORE AT 15 MORGAN 5TREET IN CRYSTAL LAKE IL SEND $350 FOR DESCRIPTIVE PRODUCT CATALOG L 1985 USA National Champion Ivan Kristensen Now Available Special Economy Kit $19995 Letters Editor Continued page 12 Thus weve filed criminal complaint charges against guy shooting down airplanes flying through sky Its lengthy battle prosecute sin come down home stretch hope will win Now before leave office have recommendation state Lets finish up court case forget about hate Weve lived through three years prob lems some us its rough Lets get sport model avi ation weve suffered long enough Mike Barklow Appleton WI accompanying letter Mike said foregoing poem written 1983 stepping down president Valley Aero Modelers clubs newsletter notpri nted due suit progress Despite best efforts club lost flying field doldrums briefperiod maintaining positive attitude group able establish new flying site rebuild itself now bigger better ever very gratying to organization Mike notes Safety/Preston Continued page 20 about accident members havent heard heres story heard few weeks ago member friend out flying weather fairly cold member standing wing tip friends plane friend attempting start using standard electric starter plastic engagement cone Somehow engine started friend surprised starter slipped off spinner hit ground trigger still depressed strn spin ning plastic cone exploded sending fragments directions friend got small piece through part ear sliver hit member corner eye caine out again doctor says 50% chance will lose eye may have have cornea transplant incident tragic enough itself stop think what could have happened occurred field person hurt innocent bystander kid Weve got keep spectators children out pit area Friends not. comment incident repeat something Ive said several times previously consider pair safety glass es starting model working shop Have safe month John Preston 12235 Tildenwood Dr Rockville MD 20852 Plane Talk/Winter Continued page 28 things become bit sticky Some will understand presentation its entirety am fortunates can interpret comments virtue simple diagram no math Will prescription fly Ponder photo giant tailless Ugly Stik involves no trick airfoils Follow Joe end youll find other comments play Let assume perfectly symmetric aircraft argument Tschirgi warms up has symmetric airfoils both wing tail thrust line wing tail CG centerline has zero-zero incidence setup also assume fore-and-aft CG position such model trim level flight Since model perfectly symmetric pitch plane its obvious model will also fly straight level verted assumptions solu tion clear leaves another problem can such model trim angle attack except zero tricky part model symmetric angle attack airflow over Behind wing generating lift have downwash evidence vorticity shed wing Its strength centerline strong function aspect ratio normal model configurations downwash small function angle attack concentrated directly down stream model changes angle attack tail sweeps through region Generally results pitching moment curves nonlinear have reduced static stability near zero lift sym metric model assumed stabil izer center downwash field However CG far enough aft static stability can zero unstable region exhibiting positive static margins outside unstable point maximum downwash effect model will have two trim points symmetric model postulated would equal opposite sign lift coefficients best visualized referring illustration fact dynamic pressure re duced wings wake Joe goes also contributes non-linearity course reversal cannot exist unless static stability quite small tail out wakeie CG well aft brings up another interesting point models easy fly some cases easiest have little static Continued page 142 May1986 139 n ou sy SEE- HFE THE BOTTLE OF ZRPJET LEPKED FiND sNIcKE YOU TRIED TO SCRPTCH YOUR GIGGLEEP / 0
Edition: Model Aviation - 1986/05
Page Numbers: 8, 10, 12, 139
Bi isq& Sa Scratch-buIldIng WE Plan N Pattern sets way go get beet designs com plete Full-Size layouts parts drawings bill mater lais save up 50% over comparable kit costs Quarter Scale R/C World Wan SE-5A 80A Wingspan- 0 2220 sq area 78 22 Engines Plan N Pattern Set RCQS-7.. $2495 SPAD C-Xlll World Wan Capable Flyer Captures Imagination 79/a Wingspan 2120 sq area 13 31 Engines Plan N Pattern Set RCQS-8.. $2795 FOKKER TRIPLANE DR-I 72 Wingspan 1772 sq area 78 150 Engines Plan N Pattern Set RCQS-8.. $2495 Quarter Scale-Golden Age Curtis Falcon 114 Wingspan- 3158 sq area Quadra Size Engine Plan N Pattern Set RCQS-13.. $2795 1/6 Scale-Golden Age French Mureau C-I 58 Wingspan 450 sq area Plan N Pattern Set RC8S-1$1295 Puss Moth 724 WinnoianARfl orn WACO SRE Cabin Biplane R/C 521/2 Wingspan 640 sq areaFor 19 40 Engines Plan N Pattern Set RC8S-3$1295 Best Ducted Fans SKYRAY F4D-l Plan Form 1 Scale Duct Fan RIC RK-20 Fan Unit Plan N Pattern Set RCD F-i$1995 Bill Efliqer Fasadleg Member AMA NFFS 1111sf Ismer Prices Complete Plans Sub Assembly Detailed Parts Lists Add $200 Mailing Tube SEND FOR BROcHURE ahead crowd New Brochure showing new Plan Sets 1988 Send *100 its ref undable first orderl WE Technical Services PO Box 76884-A Atlanta GA 30328 Piper Skycycle author Ken Wilson commended excellent Piper Skycycle article March issue Model Aviation Up until now heard few mentions airplane unaware ever kitted model manufacturers past acquired set plans Skycycle Cleve land Co some years ago extent knowledge model interesting facts Mr Wilson described certainly held interest Its obvious Piper Skycycle plane designed before its time marketed today especially kit form probably would business success Im looking forward seeing someone publish plans RC model fol lowing article Ken Wilson Alvin E Johnson Oxford PA More Airfoils Moments feel should respond Mr Brownlees remarks critique article letter editor February issue letter confuses Aerody namic Center AC Center Pressure CP Aerodynamic Cen ter about no movement symmetrical section small con stant negative moment cambered section CP simply point through resultant lift vector enve lope acts. other words lift acts given angle attack cambered sections CP does move. aft decreases angle attack forward increases angle attack Secondly some upturned elevon Clark Y section can suitable tailless configuration long CG properly placed After reading letter am still wonder ing what tried say Brad Powers San Diego CA must congratulate excel lent choice printed Mr Brownlees letter February 1986 issue Continued page 10 1 0 1 * U 0 0 0z z U 0 IA U hi -I z U LII w z -I U IL U -J 0 0 z U 0 U 0 S U $129 Plus $ 50 Postage Handling Available Dealer CE 8 Model Aviation Letters Editor letters will carefully considered general interest used Send Mod 1 Aviation 1810 Samuel Morse Dr Reston VA 22090 Plan N Pattern Set RC5S-~14ib NJ Its Listed Need See hobby shop order direct $075 Price $795 plus $180 UPS total ign air mail 5 $795 plus $5501 US dollars please Send Check MO Credit Card info Consumers Guide 150 Ott St Harrisonburg VA 22801 C 703 4340350 Nlno Address Charge Card No MC VISA CIIAICFI MasterCard lB # _____________________ Expiration SinnAri Model Aviation although did surprise bit see type letter otherwise excellent letter however sentence particular bothers namely says CP moment zero sort language feel would appropriate talking about chordwise bending stresses wing panel picture what meant force must applied wing panel balance lift force strategi cally located will also balance pitch ing moment location such force called center pressure mo ments taken about point will add up zero could stop right might feel am nitpicking So will add regardless what point chosen take moments about will add up zero Therefore CP unique point respect also feel sooner CP concept buried forgotten about better concerned James E Brock Amboy WA Another MAP Conversion compliments Dick Sarpolus Bernie Raad excellent Model Anal ysis Program January 1986 issue took some mystery out model parameters However though program operation rather straight forward little awkward use repeated calculations uses lot paper understandable since intended bare bones program So after couple runs wrote updated version Atari computer allows make repeated calculations prints out data ready probably several modelers out would like use Model Analysis Program finding origi nal little difficult work am therefore making version available 5-in diskette anyone inter ested no charge program system requirements follows Atari computer except new 5205T least 32K memory disk drive compatible printer interface Since program does use special commands should work print ers would like try program send SASE blank disk Please allow room written instruc tions included Atari version MAP will added disk returned addition features men tioned above special file will added will allow program load run automatically Hopefully will make easier less computer experience would best enclose disk sturdy mailing envelopes made purpose Please make sure Continued page 12 10 Model Aviation Consumers Guide Radio Control Products THIRD EDITION ished Oct 11985 What happens famous STICK combined St Croix quality CANARD-PUSHER configuration S imply EASIEST-TO-BUILD BESTFLYING canard airplane available high quality wood parts kit precision cut EASY TO ASSEMBLE great instructions plans youll canard flying just few days Plus thoroughly tested aerodynamic perfor mance assures airplane will easy fly LOADS OF FUN Fly bare bones have fun customiz make very own Star Wars ship Now can join CANARD REVOLU TION easy way.at price can afford Tell dealer went experience fun canard flying Its easiest best available call 800-626-7042 toil free ORDERS ONLY ST CROIX MODELS OX 279 FALLS WI 54552 details other Zimbabwe Model Products kits call write Full color deluxe catalog -$100 ZIMPRO MARKETING disk blank contains files will returned unchanged hope people will find program useful encourage program mers some other personal com puters join help fellow modelers Remember share knowledge everyone benefits Ken Rusnok PO Box 116 W Chicago IL 60185 An Era Stormy Flying Dont ask happened really dont know ended up President focus show Started out publicity made progress incremental stages newspaper radio TV contacts listed Yellow Pages some super contests always good crowds RC planes thrilling maneuvering through clouds generated much revenue colorful aerobatic display wish could today didnt happen way distant yellow ranch house dissenting person appeared Right middle contest spectator cheered lone complainer red hair abra sive could last words said Youre gonna hear Shortly thereafter via Registered Mail believe Town Board sent us letter asking us leave field nine years tenure best state almost heart attack tensions began grate combat contest gained knowledge club clearance Shortly thereafter byjamming frequencies proceeded destroy nine beloved airplanes now wasnt uneeded Consider time involved building detail plane personal loss significant sustained great personal pain planning engineering high materials cost suffered tremendously equip ment totally lost intelligently reacted staging out posts several sectors directional radio receivers docu ment interference vectors vectors defined cause problem hampers radio equipment functioning source Mr S PO BOX 3076 OAK RIDGE TENNESSEE 37830 Tel 615 482-6188Continued page 139 SPAN 60 Fi nroq 35-45 req 4Chan FOAM WING CORES PRECISION MADE EXPANDED BEAD POLYSTYRENE REPLACEMENT WING & STAB CORES FOR ALL POPULAR R/C AIRCRAFT OVER 250 DIFFERENT WINGS IN STOCK FOR IMMEDIATE DELI VER SO IF YOU HAVE FAVORITE BIRD THAT NEEDS WING CALL OR CRYSTAL CLEAR THERMOFORMED CANOPIES DRESS UP YOUR PLANE WITH NEW CANOPY FROM WING MFG TOP QUALITY TOOLING & MATERIAL MAKES THESE SECOND TO NONE WE HAVE LOTS OF SHAPES & SIZES IN STOCK WHICH FIT MOST KITS & RA SCRATCH BUILT MODELS WING MFG P0 BOX 33 cRYsTAL LAKE IL 60014 Phone 815/459-0417 VISIT OUR OUTLET STORE AT 15 MORGAN 5TREET IN CRYSTAL LAKE IL SEND $350 FOR DESCRIPTIVE PRODUCT CATALOG L 1985 USA National Champion Ivan Kristensen Now Available Special Economy Kit $19995 Letters Editor Continued page 12 Thus weve filed criminal complaint charges against guy shooting down airplanes flying through sky Its lengthy battle prosecute sin come down home stretch hope will win Now before leave office have recommendation state Lets finish up court case forget about hate Weve lived through three years prob lems some us its rough Lets get sport model avi ation weve suffered long enough Mike Barklow Appleton WI accompanying letter Mike said foregoing poem written 1983 stepping down president Valley Aero Modelers clubs newsletter notpri nted due suit progress Despite best efforts club lost flying field doldrums briefperiod maintaining positive attitude group able establish new flying site rebuild itself now bigger better ever very gratying to organization Mike notes Safety/Preston Continued page 20 about accident members havent heard heres story heard few weeks ago member friend out flying weather fairly cold member standing wing tip friends plane friend attempting start using standard electric starter plastic engagement cone Somehow engine started friend surprised starter slipped off spinner hit ground trigger still depressed strn spin ning plastic cone exploded sending fragments directions friend got small piece through part ear sliver hit member corner eye caine out again doctor says 50% chance will lose eye may have have cornea transplant incident tragic enough itself stop think what could have happened occurred field person hurt innocent bystander kid Weve got keep spectators children out pit area Friends not. comment incident repeat something Ive said several times previously consider pair safety glass es starting model working shop Have safe month John Preston 12235 Tildenwood Dr Rockville MD 20852 Plane Talk/Winter Continued page 28 things become bit sticky Some will understand presentation its entirety am fortunates can interpret comments virtue simple diagram no math Will prescription fly Ponder photo giant tailless Ugly Stik involves no trick airfoils Follow Joe end youll find other comments play Let assume perfectly symmetric aircraft argument Tschirgi warms up has symmetric airfoils both wing tail thrust line wing tail CG centerline has zero-zero incidence setup also assume fore-and-aft CG position such model trim level flight Since model perfectly symmetric pitch plane its obvious model will also fly straight level verted assumptions solu tion clear leaves another problem can such model trim angle attack except zero tricky part model symmetric angle attack airflow over Behind wing generating lift have downwash evidence vorticity shed wing Its strength centerline strong function aspect ratio normal model configurations downwash small function angle attack concentrated directly down stream model changes angle attack tail sweeps through region Generally results pitching moment curves nonlinear have reduced static stability near zero lift sym metric model assumed stabil izer center downwash field However CG far enough aft static stability can zero unstable region exhibiting positive static margins outside unstable point maximum downwash effect model will have two trim points symmetric model postulated would equal opposite sign lift coefficients best visualized referring illustration fact dynamic pressure re duced wings wake Joe goes also contributes non-linearity course reversal cannot exist unless static stability quite small tail out wakeie CG well aft brings up another interesting point models easy fly some cases easiest have little static Continued page 142 May1986 139 n ou sy SEE- HFE THE BOTTLE OF ZRPJET LEPKED FiND sNIcKE YOU TRIED TO SCRPTCH YOUR GIGGLEEP / 0
Edition: Model Aviation - 1986/05
Page Numbers: 8, 10, 12, 139
Bi isq& Sa Scratch-buIldIng WE Plan N Pattern sets way go get beet designs com plete Full-Size layouts parts drawings bill mater lais save up 50% over comparable kit costs Quarter Scale R/C World Wan SE-5A 80A Wingspan- 0 2220 sq area 78 22 Engines Plan N Pattern Set RCQS-7.. $2495 SPAD C-Xlll World Wan Capable Flyer Captures Imagination 79/a Wingspan 2120 sq area 13 31 Engines Plan N Pattern Set RCQS-8.. $2795 FOKKER TRIPLANE DR-I 72 Wingspan 1772 sq area 78 150 Engines Plan N Pattern Set RCQS-8.. $2495 Quarter Scale-Golden Age Curtis Falcon 114 Wingspan- 3158 sq area Quadra Size Engine Plan N Pattern Set RCQS-13.. $2795 1/6 Scale-Golden Age French Mureau C-I 58 Wingspan 450 sq area Plan N Pattern Set RC8S-1$1295 Puss Moth 724 WinnoianARfl orn WACO SRE Cabin Biplane R/C 521/2 Wingspan 640 sq areaFor 19 40 Engines Plan N Pattern Set RC8S-3$1295 Best Ducted Fans SKYRAY F4D-l Plan Form 1 Scale Duct Fan RIC RK-20 Fan Unit Plan N Pattern Set RCD F-i$1995 Bill Efliqer Fasadleg Member AMA NFFS 1111sf Ismer Prices Complete Plans Sub Assembly Detailed Parts Lists Add $200 Mailing Tube SEND FOR BROcHURE ahead crowd New Brochure showing new Plan Sets 1988 Send *100 its ref undable first orderl WE Technical Services PO Box 76884-A Atlanta GA 30328 Piper Skycycle author Ken Wilson commended excellent Piper Skycycle article March issue Model Aviation Up until now heard few mentions airplane unaware ever kitted model manufacturers past acquired set plans Skycycle Cleve land Co some years ago extent knowledge model interesting facts Mr Wilson described certainly held interest Its obvious Piper Skycycle plane designed before its time marketed today especially kit form probably would business success Im looking forward seeing someone publish plans RC model fol lowing article Ken Wilson Alvin E Johnson Oxford PA More Airfoils Moments feel should respond Mr Brownlees remarks critique article letter editor February issue letter confuses Aerody namic Center AC Center Pressure CP Aerodynamic Cen ter about no movement symmetrical section small con stant negative moment cambered section CP simply point through resultant lift vector enve lope acts. other words lift acts given angle attack cambered sections CP does move. aft decreases angle attack forward increases angle attack Secondly some upturned elevon Clark Y section can suitable tailless configuration long CG properly placed After reading letter am still wonder ing what tried say Brad Powers San Diego CA must congratulate excel lent choice printed Mr Brownlees letter February 1986 issue Continued page 10 1 0 1 * U 0 0 0z z U 0 IA U hi -I z U LII w z -I U IL U -J 0 0 z U 0 U 0 S U $129 Plus $ 50 Postage Handling Available Dealer CE 8 Model Aviation Letters Editor letters will carefully considered general interest used Send Mod 1 Aviation 1810 Samuel Morse Dr Reston VA 22090 Plan N Pattern Set RC5S-~14ib NJ Its Listed Need See hobby shop order direct $075 Price $795 plus $180 UPS total ign air mail 5 $795 plus $5501 US dollars please Send Check MO Credit Card info Consumers Guide 150 Ott St Harrisonburg VA 22801 C 703 4340350 Nlno Address Charge Card No MC VISA CIIAICFI MasterCard lB # _____________________ Expiration SinnAri Model Aviation although did surprise bit see type letter otherwise excellent letter however sentence particular bothers namely says CP moment zero sort language feel would appropriate talking about chordwise bending stresses wing panel picture what meant force must applied wing panel balance lift force strategi cally located will also balance pitch ing moment location such force called center pressure mo ments taken about point will add up zero could stop right might feel am nitpicking So will add regardless what point chosen take moments about will add up zero Therefore CP unique point respect also feel sooner CP concept buried forgotten about better concerned James E Brock Amboy WA Another MAP Conversion compliments Dick Sarpolus Bernie Raad excellent Model Anal ysis Program January 1986 issue took some mystery out model parameters However though program operation rather straight forward little awkward use repeated calculations uses lot paper understandable since intended bare bones program So after couple runs wrote updated version Atari computer allows make repeated calculations prints out data ready probably several modelers out would like use Model Analysis Program finding origi nal little difficult work am therefore making version available 5-in diskette anyone inter ested no charge program system requirements follows Atari computer except new 5205T least 32K memory disk drive compatible printer interface Since program does use special commands should work print ers would like try program send SASE blank disk Please allow room written instruc tions included Atari version MAP will added disk returned addition features men tioned above special file will added will allow program load run automatically Hopefully will make easier less computer experience would best enclose disk sturdy mailing envelopes made purpose Please make sure Continued page 12 10 Model Aviation Consumers Guide Radio Control Products THIRD EDITION ished Oct 11985 What happens famous STICK combined St Croix quality CANARD-PUSHER configuration S imply EASIEST-TO-BUILD BESTFLYING canard airplane available high quality wood parts kit precision cut EASY TO ASSEMBLE great instructions plans youll canard flying just few days Plus thoroughly tested aerodynamic perfor mance assures airplane will easy fly LOADS OF FUN Fly bare bones have fun customiz make very own Star Wars ship Now can join CANARD REVOLU TION easy way.at price can afford Tell dealer went experience fun canard flying Its easiest best available call 800-626-7042 toil free ORDERS ONLY ST CROIX MODELS OX 279 FALLS WI 54552 details other Zimbabwe Model Products kits call write Full color deluxe catalog -$100 ZIMPRO MARKETING disk blank contains files will returned unchanged hope people will find program useful encourage program mers some other personal com puters join help fellow modelers Remember share knowledge everyone benefits Ken Rusnok PO Box 116 W Chicago IL 60185 An Era Stormy Flying Dont ask happened really dont know ended up President focus show Started out publicity made progress incremental stages newspaper radio TV contacts listed Yellow Pages some super contests always good crowds RC planes thrilling maneuvering through clouds generated much revenue colorful aerobatic display wish could today didnt happen way distant yellow ranch house dissenting person appeared Right middle contest spectator cheered lone complainer red hair abra sive could last words said Youre gonna hear Shortly thereafter via Registered Mail believe Town Board sent us letter asking us leave field nine years tenure best state almost heart attack tensions began grate combat contest gained knowledge club clearance Shortly thereafter byjamming frequencies proceeded destroy nine beloved airplanes now wasnt uneeded Consider time involved building detail plane personal loss significant sustained great personal pain planning engineering high materials cost suffered tremendously equip ment totally lost intelligently reacted staging out posts several sectors directional radio receivers docu ment interference vectors vectors defined cause problem hampers radio equipment functioning source Mr S PO BOX 3076 OAK RIDGE TENNESSEE 37830 Tel 615 482-6188Continued page 139 SPAN 60 Fi nroq 35-45 req 4Chan FOAM WING CORES PRECISION MADE EXPANDED BEAD POLYSTYRENE REPLACEMENT WING & STAB CORES FOR ALL POPULAR R/C AIRCRAFT OVER 250 DIFFERENT WINGS IN STOCK FOR IMMEDIATE DELI VER SO IF YOU HAVE FAVORITE BIRD THAT NEEDS WING CALL OR CRYSTAL CLEAR THERMOFORMED CANOPIES DRESS UP YOUR PLANE WITH NEW CANOPY FROM WING MFG TOP QUALITY TOOLING & MATERIAL MAKES THESE SECOND TO NONE WE HAVE LOTS OF SHAPES & SIZES IN STOCK WHICH FIT MOST KITS & RA SCRATCH BUILT MODELS WING MFG P0 BOX 33 cRYsTAL LAKE IL 60014 Phone 815/459-0417 VISIT OUR OUTLET STORE AT 15 MORGAN 5TREET IN CRYSTAL LAKE IL SEND $350 FOR DESCRIPTIVE PRODUCT CATALOG L 1985 USA National Champion Ivan Kristensen Now Available Special Economy Kit $19995 Letters Editor Continued page 12 Thus weve filed criminal complaint charges against guy shooting down airplanes flying through sky Its lengthy battle prosecute sin come down home stretch hope will win Now before leave office have recommendation state Lets finish up court case forget about hate Weve lived through three years prob lems some us its rough Lets get sport model avi ation weve suffered long enough Mike Barklow Appleton WI accompanying letter Mike said foregoing poem written 1983 stepping down president Valley Aero Modelers clubs newsletter notpri nted due suit progress Despite best efforts club lost flying field doldrums briefperiod maintaining positive attitude group able establish new flying site rebuild itself now bigger better ever very gratying to organization Mike notes Safety/Preston Continued page 20 about accident members havent heard heres story heard few weeks ago member friend out flying weather fairly cold member standing wing tip friends plane friend attempting start using standard electric starter plastic engagement cone Somehow engine started friend surprised starter slipped off spinner hit ground trigger still depressed strn spin ning plastic cone exploded sending fragments directions friend got small piece through part ear sliver hit member corner eye caine out again doctor says 50% chance will lose eye may have have cornea transplant incident tragic enough itself stop think what could have happened occurred field person hurt innocent bystander kid Weve got keep spectators children out pit area Friends not. comment incident repeat something Ive said several times previously consider pair safety glass es starting model working shop Have safe month John Preston 12235 Tildenwood Dr Rockville MD 20852 Plane Talk/Winter Continued page 28 things become bit sticky Some will understand presentation its entirety am fortunates can interpret comments virtue simple diagram no math Will prescription fly Ponder photo giant tailless Ugly Stik involves no trick airfoils Follow Joe end youll find other comments play Let assume perfectly symmetric aircraft argument Tschirgi warms up has symmetric airfoils both wing tail thrust line wing tail CG centerline has zero-zero incidence setup also assume fore-and-aft CG position such model trim level flight Since model perfectly symmetric pitch plane its obvious model will also fly straight level verted assumptions solu tion clear leaves another problem can such model trim angle attack except zero tricky part model symmetric angle attack airflow over Behind wing generating lift have downwash evidence vorticity shed wing Its strength centerline strong function aspect ratio normal model configurations downwash small function angle attack concentrated directly down stream model changes angle attack tail sweeps through region Generally results pitching moment curves nonlinear have reduced static stability near zero lift sym metric model assumed stabil izer center downwash field However CG far enough aft static stability can zero unstable region exhibiting positive static margins outside unstable point maximum downwash effect model will have two trim points symmetric model postulated would equal opposite sign lift coefficients best visualized referring illustration fact dynamic pressure re duced wings wake Joe goes also contributes non-linearity course reversal cannot exist unless static stability quite small tail out wakeie CG well aft brings up another interesting point models easy fly some cases easiest have little static Continued page 142 May1986 139 n ou sy SEE- HFE THE BOTTLE OF ZRPJET LEPKED FiND sNIcKE YOU TRIED TO SCRPTCH YOUR GIGGLEEP / 0
Edition: Model Aviation - 1986/05
Page Numbers: 8, 10, 12, 139
Bi isq& Sa Scratch-buIldIng WE Plan N Pattern sets way go get beet designs com plete Full-Size layouts parts drawings bill mater lais save up 50% over comparable kit costs Quarter Scale R/C World Wan SE-5A 80A Wingspan- 0 2220 sq area 78 22 Engines Plan N Pattern Set RCQS-7.. $2495 SPAD C-Xlll World Wan Capable Flyer Captures Imagination 79/a Wingspan 2120 sq area 13 31 Engines Plan N Pattern Set RCQS-8.. $2795 FOKKER TRIPLANE DR-I 72 Wingspan 1772 sq area 78 150 Engines Plan N Pattern Set RCQS-8.. $2495 Quarter Scale-Golden Age Curtis Falcon 114 Wingspan- 3158 sq area Quadra Size Engine Plan N Pattern Set RCQS-13.. $2795 1/6 Scale-Golden Age French Mureau C-I 58 Wingspan 450 sq area Plan N Pattern Set RC8S-1$1295 Puss Moth 724 WinnoianARfl orn WACO SRE Cabin Biplane R/C 521/2 Wingspan 640 sq areaFor 19 40 Engines Plan N Pattern Set RC8S-3$1295 Best Ducted Fans SKYRAY F4D-l Plan Form 1 Scale Duct Fan RIC RK-20 Fan Unit Plan N Pattern Set RCD F-i$1995 Bill Efliqer Fasadleg Member AMA NFFS 1111sf Ismer Prices Complete Plans Sub Assembly Detailed Parts Lists Add $200 Mailing Tube SEND FOR BROcHURE ahead crowd New Brochure showing new Plan Sets 1988 Send *100 its ref undable first orderl WE Technical Services PO Box 76884-A Atlanta GA 30328 Piper Skycycle author Ken Wilson commended excellent Piper Skycycle article March issue Model Aviation Up until now heard few mentions airplane unaware ever kitted model manufacturers past acquired set plans Skycycle Cleve land Co some years ago extent knowledge model interesting facts Mr Wilson described certainly held interest Its obvious Piper Skycycle plane designed before its time marketed today especially kit form probably would business success Im looking forward seeing someone publish plans RC model fol lowing article Ken Wilson Alvin E Johnson Oxford PA More Airfoils Moments feel should respond Mr Brownlees remarks critique article letter editor February issue letter confuses Aerody namic Center AC Center Pressure CP Aerodynamic Cen ter about no movement symmetrical section small con stant negative moment cambered section CP simply point through resultant lift vector enve lope acts. other words lift acts given angle attack cambered sections CP does move. aft decreases angle attack forward increases angle attack Secondly some upturned elevon Clark Y section can suitable tailless configuration long CG properly placed After reading letter am still wonder ing what tried say Brad Powers San Diego CA must congratulate excel lent choice printed Mr Brownlees letter February 1986 issue Continued page 10 1 0 1 * U 0 0 0z z U 0 IA U hi -I z U LII w z -I U IL U -J 0 0 z U 0 U 0 S U $129 Plus $ 50 Postage Handling Available Dealer CE 8 Model Aviation Letters Editor letters will carefully considered general interest used Send Mod 1 Aviation 1810 Samuel Morse Dr Reston VA 22090 Plan N Pattern Set RC5S-~14ib NJ Its Listed Need See hobby shop order direct $075 Price $795 plus $180 UPS total ign air mail 5 $795 plus $5501 US dollars please Send Check MO Credit Card info Consumers Guide 150 Ott St Harrisonburg VA 22801 C 703 4340350 Nlno Address Charge Card No MC VISA CIIAICFI MasterCard lB # _____________________ Expiration SinnAri Model Aviation although did surprise bit see type letter otherwise excellent letter however sentence particular bothers namely says CP moment zero sort language feel would appropriate talking about chordwise bending stresses wing panel picture what meant force must applied wing panel balance lift force strategi cally located will also balance pitch ing moment location such force called center pressure mo ments taken about point will add up zero could stop right might feel am nitpicking So will add regardless what point chosen take moments about will add up zero Therefore CP unique point respect also feel sooner CP concept buried forgotten about better concerned James E Brock Amboy WA Another MAP Conversion compliments Dick Sarpolus Bernie Raad excellent Model Anal ysis Program January 1986 issue took some mystery out model parameters However though program operation rather straight forward little awkward use repeated calculations uses lot paper understandable since intended bare bones program So after couple runs wrote updated version Atari computer allows make repeated calculations prints out data ready probably several modelers out would like use Model Analysis Program finding origi nal little difficult work am therefore making version available 5-in diskette anyone inter ested no charge program system requirements follows Atari computer except new 5205T least 32K memory disk drive compatible printer interface Since program does use special commands should work print ers would like try program send SASE blank disk Please allow room written instruc tions included Atari version MAP will added disk returned addition features men tioned above special file will added will allow program load run automatically Hopefully will make easier less computer experience would best enclose disk sturdy mailing envelopes made purpose Please make sure Continued page 12 10 Model Aviation Consumers Guide Radio Control Products THIRD EDITION ished Oct 11985 What happens famous STICK combined St Croix quality CANARD-PUSHER configuration S imply EASIEST-TO-BUILD BESTFLYING canard airplane available high quality wood parts kit precision cut EASY TO ASSEMBLE great instructions plans youll canard flying just few days Plus thoroughly tested aerodynamic perfor mance assures airplane will easy fly LOADS OF FUN Fly bare bones have fun customiz make very own Star Wars ship Now can join CANARD REVOLU TION easy way.at price can afford Tell dealer went experience fun canard flying Its easiest best available call 800-626-7042 toil free ORDERS ONLY ST CROIX MODELS OX 279 FALLS WI 54552 details other Zimbabwe Model Products kits call write Full color deluxe catalog -$100 ZIMPRO MARKETING disk blank contains files will returned unchanged hope people will find program useful encourage program mers some other personal com puters join help fellow modelers Remember share knowledge everyone benefits Ken Rusnok PO Box 116 W Chicago IL 60185 An Era Stormy Flying Dont ask happened really dont know ended up President focus show Started out publicity made progress incremental stages newspaper radio TV contacts listed Yellow Pages some super contests always good crowds RC planes thrilling maneuvering through clouds generated much revenue colorful aerobatic display wish could today didnt happen way distant yellow ranch house dissenting person appeared Right middle contest spectator cheered lone complainer red hair abra sive could last words said Youre gonna hear Shortly thereafter via Registered Mail believe Town Board sent us letter asking us leave field nine years tenure best state almost heart attack tensions began grate combat contest gained knowledge club clearance Shortly thereafter byjamming frequencies proceeded destroy nine beloved airplanes now wasnt uneeded Consider time involved building detail plane personal loss significant sustained great personal pain planning engineering high materials cost suffered tremendously equip ment totally lost intelligently reacted staging out posts several sectors directional radio receivers docu ment interference vectors vectors defined cause problem hampers radio equipment functioning source Mr S PO BOX 3076 OAK RIDGE TENNESSEE 37830 Tel 615 482-6188Continued page 139 SPAN 60 Fi nroq 35-45 req 4Chan FOAM WING CORES PRECISION MADE EXPANDED BEAD POLYSTYRENE REPLACEMENT WING & STAB CORES FOR ALL POPULAR R/C AIRCRAFT OVER 250 DIFFERENT WINGS IN STOCK FOR IMMEDIATE DELI VER SO IF YOU HAVE FAVORITE BIRD THAT NEEDS WING CALL OR CRYSTAL CLEAR THERMOFORMED CANOPIES DRESS UP YOUR PLANE WITH NEW CANOPY FROM WING MFG TOP QUALITY TOOLING & MATERIAL MAKES THESE SECOND TO NONE WE HAVE LOTS OF SHAPES & SIZES IN STOCK WHICH FIT MOST KITS & RA SCRATCH BUILT MODELS WING MFG P0 BOX 33 cRYsTAL LAKE IL 60014 Phone 815/459-0417 VISIT OUR OUTLET STORE AT 15 MORGAN 5TREET IN CRYSTAL LAKE IL SEND $350 FOR DESCRIPTIVE PRODUCT CATALOG L 1985 USA National Champion Ivan Kristensen Now Available Special Economy Kit $19995 Letters Editor Continued page 12 Thus weve filed criminal complaint charges against guy shooting down airplanes flying through sky Its lengthy battle prosecute sin come down home stretch hope will win Now before leave office have recommendation state Lets finish up court case forget about hate Weve lived through three years prob lems some us its rough Lets get sport model avi ation weve suffered long enough Mike Barklow Appleton WI accompanying letter Mike said foregoing poem written 1983 stepping down president Valley Aero Modelers clubs newsletter notpri nted due suit progress Despite best efforts club lost flying field doldrums briefperiod maintaining positive attitude group able establish new flying site rebuild itself now bigger better ever very gratying to organization Mike notes Safety/Preston Continued page 20 about accident members havent heard heres story heard few weeks ago member friend out flying weather fairly cold member standing wing tip friends plane friend attempting start using standard electric starter plastic engagement cone Somehow engine started friend surprised starter slipped off spinner hit ground trigger still depressed strn spin ning plastic cone exploded sending fragments directions friend got small piece through part ear sliver hit member corner eye caine out again doctor says 50% chance will lose eye may have have cornea transplant incident tragic enough itself stop think what could have happened occurred field person hurt innocent bystander kid Weve got keep spectators children out pit area Friends not. comment incident repeat something Ive said several times previously consider pair safety glass es starting model working shop Have safe month John Preston 12235 Tildenwood Dr Rockville MD 20852 Plane Talk/Winter Continued page 28 things become bit sticky Some will understand presentation its entirety am fortunates can interpret comments virtue simple diagram no math Will prescription fly Ponder photo giant tailless Ugly Stik involves no trick airfoils Follow Joe end youll find other comments play Let assume perfectly symmetric aircraft argument Tschirgi warms up has symmetric airfoils both wing tail thrust line wing tail CG centerline has zero-zero incidence setup also assume fore-and-aft CG position such model trim level flight Since model perfectly symmetric pitch plane its obvious model will also fly straight level verted assumptions solu tion clear leaves another problem can such model trim angle attack except zero tricky part model symmetric angle attack airflow over Behind wing generating lift have downwash evidence vorticity shed wing Its strength centerline strong function aspect ratio normal model configurations downwash small function angle attack concentrated directly down stream model changes angle attack tail sweeps through region Generally results pitching moment curves nonlinear have reduced static stability near zero lift sym metric model assumed stabil izer center downwash field However CG far enough aft static stability can zero unstable region exhibiting positive static margins outside unstable point maximum downwash effect model will have two trim points symmetric model postulated would equal opposite sign lift coefficients best visualized referring illustration fact dynamic pressure re duced wings wake Joe goes also contributes non-linearity course reversal cannot exist unless static stability quite small tail out wakeie CG well aft brings up another interesting point models easy fly some cases easiest have little static Continued page 142 May1986 139 n ou sy SEE- HFE THE BOTTLE OF ZRPJET LEPKED FiND sNIcKE YOU TRIED TO SCRPTCH YOUR GIGGLEEP / 0