HERE WE GO AGAIN received letter James Sanders Oklahoma City OK member Baxter Field Club says four flying clubs Oklahoma City think best Dont Anyway main theme James letter will strike famil iar chord hearts souls anyone has read column very long James wrote am getting some heated arguments Okle land Oklahoma have share wild winds leads question Does airplane feel wind flight have very strong opinion does prove point explain airplane has fal len shear wind downdraft Also small aircraft enters tornado will torn shreds Could please give us expert view subject Does airplane feel wind Okay pro con wind effects combat ants out can almost hear gnashing teeth see fists waving air Lets sensible rational people about Without lot fanfare let say air plane cannot feel steady wind once has reached stabilized flight after takeoff However airplane can feel unsteady wind Some ex amples unsteady wind gusts wind shear dust devils tornados Obviously airplane sitting runway can feel klnds wind establishes itself flight within air mass moving uniformly steady wind can no longer feel wind feels bumps air steady wind Thats Im going say subject now After chiding before about provoklng read ers subject wind effects airplanes Ra dio Control Modelers Sunday Flier Ken Wil lard probably getting ready again also received very nice letter Dick Han son Dick Hanson Models questioned statement January 1989 column took very complicated set interactions enable alrplane fly upright inverted chang ing elevator input wrote am profes sional aerodynamicistso patient please relate just complicated interchange will produce identical upright inverted flight read thought Blast thinks Ive got secret hidden away has eluded Pat tern designers years truth dont have secret share However have seen air planes capable upright invertatrim Angle Attack atrim Figure 1 Does curve look familiar similar Rons January 89 column solid line shows variation aircrafts pitching moment respect wing angle attack elevator deflection steady-state level flight pitching moment must zero denoted atim inverted flight wing must fly negative angle tack noted m since elevator position has changed would large pitching moment present dotted line means airplane would trim level inverted flight theres story well see Figure 2 Pitching Moment atrlm atrim Angle Attack Figure 2 Van Putte states aircraft pitching moment curve like plane would fly either upright inverted same elevator setting notes some bombs rockets have pitching moment curves resemble 44 Model Aviation Radio Control Sport Aerobatics Ron Van Putte Ill SleepyOaks Rd Ft Walton Dead, FL 32548 Will Aurora fly upright inverted same elevator setting No its still tough beat elevator subject column Auroras belong Steve Helms Pitching Moment ed flight same elevator input Does mean airplanes great Pattern de signs general no Nevertheless want show what must have happened enable airplanes trim upright inverted same elevator input January column set curves pitching moment versus angle attack three elevator settings order airplane trimmed steady level flight airplanes lift must equai its weight net pitching mo ment must zero means elevator must adjusted pitching moment zeroed out airplane trim angle attack look pitching moment curve satisfies requirements will look like Figure 1 Youll note slope pitching mo ment negative mean increase decrease angle attack trim gle attack will result pitching moment tends return angle attack trim angle attack tendency return trim angle attack called static longitudi nal stability way achieve proper placement aircrafts center-of-gravity Vir tually aircraft should statically stable successful fliers because static stability aircraft cannot dynamically stable Air planes like F-16 statically unstable thats another story because use black box control systems achieve stability look Figure 1 again youll see pitching moment curve passes through zero once trim angle attack roll airplane inverted rolling about axis airplane its angle attack will neg ative what before will large pitching moment present pitching moment must zero trim cant roll airplane inverted expect trim out un less put Down elevator Now lets take look another pitching mo ment curve Suppose airplane pitching moment versus angle attack curve elevator setting looked like Figure 2 looks strange doesnt However has two trim angles attack upright inverted flight addition statically stable small perturbations angle attack about trim angle attack An airplane exhibiting kind pitching moment curve could fly either upright inverted same angle attack question Can airplane built pitching moment curve looks like Yes takes several complicated interac tions achieve said before Its uncommon bombs mis siles have pitching moment curve looks like Figure 2 see quite few working Air Force Eglin AFB admit unusual airplane exhibit such pitching characteristics Thats dont see airplanes can roll inverted keep same elevator trim However though possible airplane can per form trick isnt necessarily contest winner Dick Hanson Mr Tiporare knows lot about practical side aerodynamics Part what wrote may interest lot Using models fly edge very easily test vehicles can alter track pushing top pushing bottom control ling factor rudder input consequent crease angle attack fuselage blanks partially download trim stabilizer allows wing change its angle Continued page 146 Leader Small Airfoil Technology MASIE1I AIRSCRL1 four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer GJP Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sizes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 614 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See your Hobby Dealer MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rosa CA 95401 March 1989 45 ELECTRIC SERIES Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 02 $2000 1/4 scale 4 02 $2800 1/5 scale 3 02 $2400 1/3 scale 9 02 $3200 Pius $500 postage packing Airmail z fast delvey send phone Visa Mastercharge number AH DESIGNS 79 Pen-y-Maes Ave Rhyi Ciwyd LL18 4ED UK Tel 745-53987 zation laminar turbulent flow very interesting original research Hew itts part final item drawing some nice prizes Bob Sealy donated Ultima kit World Engines Expert radio Paul Carison kit new Quasoar design Ace Radio Digipace Needless say didnt get thing quickly off airport get back Denver work Monday visit Oshkosh two days seminar very educational memorable weekend time went very quickly enjoyed greatly Id say attendees seemed enjoy ing themselves too What else would ex pect 100 guys get together talk Soar ing Finally Id like thank members MARCS club putting sem inar including Chairman Bill Vogelsang Walt Seaborg Al Scidmore Tim Morgan Frank Baker Joe Imilkowskl espe cially Carl Mohs excellent taxi ser vice RC Aerobatics/Van Putte Continued page 45 attack Usually almost always wing sim ply assumes streamlined profile af fected dihedral Naturally model skidding more rudder input creased dihedral now produces its own forc es depending other force setups di hedral fuselage shape stabilizer etc good models have tested will easily fly straight line shift top bottom rudder corrections what its worth best designs exhibit least corkscrewing altitude loss always have lots forward lateral area better put distribution fuselage side area approximates wing CG fuselage knife edge flight very close CG normally indicated Very interesting Dick Thanks got note Bud Overn Santa Ana CA wrote passing Hi Johnson no longer able get thin styrofoam sheets called white skin Through efforts George Sparr Aerospace Composite Prod ucts again available 24-in sheets ad dress PO Box 16621 Irvine CA 92714 Thanks hint Bud Modelers might also interested George has lot composite products including glass cloth Kevlar mat Aero c mar Aero k mat others Ive proba bly forgotten Drop him line As written its just before Christmas hope nice happily building away onor otherwise enjoyingyour RC oriented presents Santa might well building because its cold almost everywhere country late January panhandle Florida RC Scale/Hanft Continued page 47 possible prefer make full-stall land ing roundout effected airspeed dissi pates altitude ever slightly above runway attitude established held grad ually pulling back stick holding nose aircraft up losing airspeed until aircraft settles softly onto runway grass full Up elevator paramount point keep aircraft nosing over own misfortune point slightly before tend relax elevator rudder controland ground loop inevit able ground loop uncontrolled maneuver aircraft makes rapid turnoften full 3600—while rolling along ground conventional-geared aircraft wing tip outboard side turn can scrape ground often causing some airframe/fabric damage RMcM Scale model makes proper stall landing pretty realistic its sure bring roar spectators fellow contes tants Tricycle-gear planes follow almost same se quence except initial contact ground main gear airspeed lost nose gear gently settles through make contact runway elevator can no longer hold off have seen space shut tle return earth have watched breathlessly command pilots gently land huge craft Its like attempting landing plane full eggs Just beautiful Dont agree present flight can make differ ence between average score winning Continued page 148 ultimate question LOVESONG answer have tried latest hi-tech looking thermal competition gliders know original. Windeong better Well liked Windsong will love Lovesong Al Doig has said Lovesong finally got right High praise Indeed great modifier himself - Send 2 stamps new catalog I DOD~ON DEIiN Z1ZU Damson Road Bothell WA 98021 208-776-8067 146 Model Aviation iE1C E1 Balsa T000 Cutters OIJ 5 pc Masters Set 1/8 3/16 1/4 5/16 3/8 . $1698 3 pc Builders Set 3/161/4 5/16$998 Whether kit builder scratch builder SQUARE CUT Tools will save time Remove stubborn die cuts cut own squares slots Made US quality machined nickel plated steel Order set today See Dealer Cataloger Order dont carry Square cut Tools call us call well pay shipping US Canada D extra SOIJARE CUT Tools 4073 254-0516 905 N Harbor City Blvd Melbourne FL 32935 DeaIeg/Distributor Inquiries Invited Florida Residents Add 8% Sales Tax
Edition: Model Aviation - 1989/03
Page Numbers: 44, 45, 146
HERE WE GO AGAIN received letter James Sanders Oklahoma City OK member Baxter Field Club says four flying clubs Oklahoma City think best Dont Anyway main theme James letter will strike famil iar chord hearts souls anyone has read column very long James wrote am getting some heated arguments Okle land Oklahoma have share wild winds leads question Does airplane feel wind flight have very strong opinion does prove point explain airplane has fal len shear wind downdraft Also small aircraft enters tornado will torn shreds Could please give us expert view subject Does airplane feel wind Okay pro con wind effects combat ants out can almost hear gnashing teeth see fists waving air Lets sensible rational people about Without lot fanfare let say air plane cannot feel steady wind once has reached stabilized flight after takeoff However airplane can feel unsteady wind Some ex amples unsteady wind gusts wind shear dust devils tornados Obviously airplane sitting runway can feel klnds wind establishes itself flight within air mass moving uniformly steady wind can no longer feel wind feels bumps air steady wind Thats Im going say subject now After chiding before about provoklng read ers subject wind effects airplanes Ra dio Control Modelers Sunday Flier Ken Wil lard probably getting ready again also received very nice letter Dick Han son Dick Hanson Models questioned statement January 1989 column took very complicated set interactions enable alrplane fly upright inverted chang ing elevator input wrote am profes sional aerodynamicistso patient please relate just complicated interchange will produce identical upright inverted flight read thought Blast thinks Ive got secret hidden away has eluded Pat tern designers years truth dont have secret share However have seen air planes capable upright invertatrim Angle Attack atrim Figure 1 Does curve look familiar similar Rons January 89 column solid line shows variation aircrafts pitching moment respect wing angle attack elevator deflection steady-state level flight pitching moment must zero denoted atim inverted flight wing must fly negative angle tack noted m since elevator position has changed would large pitching moment present dotted line means airplane would trim level inverted flight theres story well see Figure 2 Pitching Moment atrlm atrim Angle Attack Figure 2 Van Putte states aircraft pitching moment curve like plane would fly either upright inverted same elevator setting notes some bombs rockets have pitching moment curves resemble 44 Model Aviation Radio Control Sport Aerobatics Ron Van Putte Ill SleepyOaks Rd Ft Walton Dead, FL 32548 Will Aurora fly upright inverted same elevator setting No its still tough beat elevator subject column Auroras belong Steve Helms Pitching Moment ed flight same elevator input Does mean airplanes great Pattern de signs general no Nevertheless want show what must have happened enable airplanes trim upright inverted same elevator input January column set curves pitching moment versus angle attack three elevator settings order airplane trimmed steady level flight airplanes lift must equai its weight net pitching mo ment must zero means elevator must adjusted pitching moment zeroed out airplane trim angle attack look pitching moment curve satisfies requirements will look like Figure 1 Youll note slope pitching mo ment negative mean increase decrease angle attack trim gle attack will result pitching moment tends return angle attack trim angle attack tendency return trim angle attack called static longitudi nal stability way achieve proper placement aircrafts center-of-gravity Vir tually aircraft should statically stable successful fliers because static stability aircraft cannot dynamically stable Air planes like F-16 statically unstable thats another story because use black box control systems achieve stability look Figure 1 again youll see pitching moment curve passes through zero once trim angle attack roll airplane inverted rolling about axis airplane its angle attack will neg ative what before will large pitching moment present pitching moment must zero trim cant roll airplane inverted expect trim out un less put Down elevator Now lets take look another pitching mo ment curve Suppose airplane pitching moment versus angle attack curve elevator setting looked like Figure 2 looks strange doesnt However has two trim angles attack upright inverted flight addition statically stable small perturbations angle attack about trim angle attack An airplane exhibiting kind pitching moment curve could fly either upright inverted same angle attack question Can airplane built pitching moment curve looks like Yes takes several complicated interac tions achieve said before Its uncommon bombs mis siles have pitching moment curve looks like Figure 2 see quite few working Air Force Eglin AFB admit unusual airplane exhibit such pitching characteristics Thats dont see airplanes can roll inverted keep same elevator trim However though possible airplane can per form trick isnt necessarily contest winner Dick Hanson Mr Tiporare knows lot about practical side aerodynamics Part what wrote may interest lot Using models fly edge very easily test vehicles can alter track pushing top pushing bottom control ling factor rudder input consequent crease angle attack fuselage blanks partially download trim stabilizer allows wing change its angle Continued page 146 Leader Small Airfoil Technology MASIE1I AIRSCRL1 four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer GJP Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sizes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 614 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See your Hobby Dealer MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rosa CA 95401 March 1989 45 ELECTRIC SERIES Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 02 $2000 1/4 scale 4 02 $2800 1/5 scale 3 02 $2400 1/3 scale 9 02 $3200 Pius $500 postage packing Airmail z fast delvey send phone Visa Mastercharge number AH DESIGNS 79 Pen-y-Maes Ave Rhyi Ciwyd LL18 4ED UK Tel 745-53987 zation laminar turbulent flow very interesting original research Hew itts part final item drawing some nice prizes Bob Sealy donated Ultima kit World Engines Expert radio Paul Carison kit new Quasoar design Ace Radio Digipace Needless say didnt get thing quickly off airport get back Denver work Monday visit Oshkosh two days seminar very educational memorable weekend time went very quickly enjoyed greatly Id say attendees seemed enjoy ing themselves too What else would ex pect 100 guys get together talk Soar ing Finally Id like thank members MARCS club putting sem inar including Chairman Bill Vogelsang Walt Seaborg Al Scidmore Tim Morgan Frank Baker Joe Imilkowskl espe cially Carl Mohs excellent taxi ser vice RC Aerobatics/Van Putte Continued page 45 attack Usually almost always wing sim ply assumes streamlined profile af fected dihedral Naturally model skidding more rudder input creased dihedral now produces its own forc es depending other force setups di hedral fuselage shape stabilizer etc good models have tested will easily fly straight line shift top bottom rudder corrections what its worth best designs exhibit least corkscrewing altitude loss always have lots forward lateral area better put distribution fuselage side area approximates wing CG fuselage knife edge flight very close CG normally indicated Very interesting Dick Thanks got note Bud Overn Santa Ana CA wrote passing Hi Johnson no longer able get thin styrofoam sheets called white skin Through efforts George Sparr Aerospace Composite Prod ucts again available 24-in sheets ad dress PO Box 16621 Irvine CA 92714 Thanks hint Bud Modelers might also interested George has lot composite products including glass cloth Kevlar mat Aero c mar Aero k mat others Ive proba bly forgotten Drop him line As written its just before Christmas hope nice happily building away onor otherwise enjoyingyour RC oriented presents Santa might well building because its cold almost everywhere country late January panhandle Florida RC Scale/Hanft Continued page 47 possible prefer make full-stall land ing roundout effected airspeed dissi pates altitude ever slightly above runway attitude established held grad ually pulling back stick holding nose aircraft up losing airspeed until aircraft settles softly onto runway grass full Up elevator paramount point keep aircraft nosing over own misfortune point slightly before tend relax elevator rudder controland ground loop inevit able ground loop uncontrolled maneuver aircraft makes rapid turnoften full 3600—while rolling along ground conventional-geared aircraft wing tip outboard side turn can scrape ground often causing some airframe/fabric damage RMcM Scale model makes proper stall landing pretty realistic its sure bring roar spectators fellow contes tants Tricycle-gear planes follow almost same se quence except initial contact ground main gear airspeed lost nose gear gently settles through make contact runway elevator can no longer hold off have seen space shut tle return earth have watched breathlessly command pilots gently land huge craft Its like attempting landing plane full eggs Just beautiful Dont agree present flight can make differ ence between average score winning Continued page 148 ultimate question LOVESONG answer have tried latest hi-tech looking thermal competition gliders know original. Windeong better Well liked Windsong will love Lovesong Al Doig has said Lovesong finally got right High praise Indeed great modifier himself - Send 2 stamps new catalog I DOD~ON DEIiN Z1ZU Damson Road Bothell WA 98021 208-776-8067 146 Model Aviation iE1C E1 Balsa T000 Cutters OIJ 5 pc Masters Set 1/8 3/16 1/4 5/16 3/8 . $1698 3 pc Builders Set 3/161/4 5/16$998 Whether kit builder scratch builder SQUARE CUT Tools will save time Remove stubborn die cuts cut own squares slots Made US quality machined nickel plated steel Order set today See Dealer Cataloger Order dont carry Square cut Tools call us call well pay shipping US Canada D extra SOIJARE CUT Tools 4073 254-0516 905 N Harbor City Blvd Melbourne FL 32935 DeaIeg/Distributor Inquiries Invited Florida Residents Add 8% Sales Tax
Edition: Model Aviation - 1989/03
Page Numbers: 44, 45, 146
HERE WE GO AGAIN received letter James Sanders Oklahoma City OK member Baxter Field Club says four flying clubs Oklahoma City think best Dont Anyway main theme James letter will strike famil iar chord hearts souls anyone has read column very long James wrote am getting some heated arguments Okle land Oklahoma have share wild winds leads question Does airplane feel wind flight have very strong opinion does prove point explain airplane has fal len shear wind downdraft Also small aircraft enters tornado will torn shreds Could please give us expert view subject Does airplane feel wind Okay pro con wind effects combat ants out can almost hear gnashing teeth see fists waving air Lets sensible rational people about Without lot fanfare let say air plane cannot feel steady wind once has reached stabilized flight after takeoff However airplane can feel unsteady wind Some ex amples unsteady wind gusts wind shear dust devils tornados Obviously airplane sitting runway can feel klnds wind establishes itself flight within air mass moving uniformly steady wind can no longer feel wind feels bumps air steady wind Thats Im going say subject now After chiding before about provoklng read ers subject wind effects airplanes Ra dio Control Modelers Sunday Flier Ken Wil lard probably getting ready again also received very nice letter Dick Han son Dick Hanson Models questioned statement January 1989 column took very complicated set interactions enable alrplane fly upright inverted chang ing elevator input wrote am profes sional aerodynamicistso patient please relate just complicated interchange will produce identical upright inverted flight read thought Blast thinks Ive got secret hidden away has eluded Pat tern designers years truth dont have secret share However have seen air planes capable upright invertatrim Angle Attack atrim Figure 1 Does curve look familiar similar Rons January 89 column solid line shows variation aircrafts pitching moment respect wing angle attack elevator deflection steady-state level flight pitching moment must zero denoted atim inverted flight wing must fly negative angle tack noted m since elevator position has changed would large pitching moment present dotted line means airplane would trim level inverted flight theres story well see Figure 2 Pitching Moment atrlm atrim Angle Attack Figure 2 Van Putte states aircraft pitching moment curve like plane would fly either upright inverted same elevator setting notes some bombs rockets have pitching moment curves resemble 44 Model Aviation Radio Control Sport Aerobatics Ron Van Putte Ill SleepyOaks Rd Ft Walton Dead, FL 32548 Will Aurora fly upright inverted same elevator setting No its still tough beat elevator subject column Auroras belong Steve Helms Pitching Moment ed flight same elevator input Does mean airplanes great Pattern de signs general no Nevertheless want show what must have happened enable airplanes trim upright inverted same elevator input January column set curves pitching moment versus angle attack three elevator settings order airplane trimmed steady level flight airplanes lift must equai its weight net pitching mo ment must zero means elevator must adjusted pitching moment zeroed out airplane trim angle attack look pitching moment curve satisfies requirements will look like Figure 1 Youll note slope pitching mo ment negative mean increase decrease angle attack trim gle attack will result pitching moment tends return angle attack trim angle attack tendency return trim angle attack called static longitudi nal stability way achieve proper placement aircrafts center-of-gravity Vir tually aircraft should statically stable successful fliers because static stability aircraft cannot dynamically stable Air planes like F-16 statically unstable thats another story because use black box control systems achieve stability look Figure 1 again youll see pitching moment curve passes through zero once trim angle attack roll airplane inverted rolling about axis airplane its angle attack will neg ative what before will large pitching moment present pitching moment must zero trim cant roll airplane inverted expect trim out un less put Down elevator Now lets take look another pitching mo ment curve Suppose airplane pitching moment versus angle attack curve elevator setting looked like Figure 2 looks strange doesnt However has two trim angles attack upright inverted flight addition statically stable small perturbations angle attack about trim angle attack An airplane exhibiting kind pitching moment curve could fly either upright inverted same angle attack question Can airplane built pitching moment curve looks like Yes takes several complicated interac tions achieve said before Its uncommon bombs mis siles have pitching moment curve looks like Figure 2 see quite few working Air Force Eglin AFB admit unusual airplane exhibit such pitching characteristics Thats dont see airplanes can roll inverted keep same elevator trim However though possible airplane can per form trick isnt necessarily contest winner Dick Hanson Mr Tiporare knows lot about practical side aerodynamics Part what wrote may interest lot Using models fly edge very easily test vehicles can alter track pushing top pushing bottom control ling factor rudder input consequent crease angle attack fuselage blanks partially download trim stabilizer allows wing change its angle Continued page 146 Leader Small Airfoil Technology MASIE1I AIRSCRL1 four series choose Master Airscrew offers full line propellers flying application made tough glass-filled nylon superior strength durability GIF SERIES Designed sport flyer GJP Series available 28 popular sizes 5-11 diameters K SERIES K Series designed 4 2 stroke applications Wide undercambered blades provide greater thrust slower turning 4 strokes 8 sizes including new 12 x 8 15 x 10 tips painted safety ANTIQUE SERIES performance series features scimitar shape swept back tips plenty undercamber s suitable application Sizes 12 x 6 13 x 614 x 716 x 7 new 10 x 5 11 x 6 gold glass-filled nylon 12 x 8 15 x 12 folding propellers geared systems 8 selffeathering adjustable pitch prop 05 direct drive give improved thrust glide less drag fixed blade props See your Hobby Dealer MASTER AIRSCREW propellers accessories Windsor Propeller Company 384 Tesconi Court Santa Rosa CA 95401 March 1989 45 ELECTRIC SERIES Europes leading manufacturer pilots supply fully positional figures National Scale Champs dress pilots known apparel Accessories include helmets goggles sunglasses bobble hats baseball caps floppy hats bone domes oxygen masks maewests popular types WWI WWII Sports piece suit stripes colours NATO piece suit map pockets olive green Glider pilots turtle neck sweaters floppy hat sunglasses Standard pilots tan pants simulated leather jacket fur collar baseball hat sunglasses pilots lightest ever come painted dressed ready fly 1/6 scale 2 02 $2000 1/4 scale 4 02 $2800 1/5 scale 3 02 $2400 1/3 scale 9 02 $3200 Pius $500 postage packing Airmail z fast delvey send phone Visa Mastercharge number AH DESIGNS 79 Pen-y-Maes Ave Rhyi Ciwyd LL18 4ED UK Tel 745-53987 zation laminar turbulent flow very interesting original research Hew itts part final item drawing some nice prizes Bob Sealy donated Ultima kit World Engines Expert radio Paul Carison kit new Quasoar design Ace Radio Digipace Needless say didnt get thing quickly off airport get back Denver work Monday visit Oshkosh two days seminar very educational memorable weekend time went very quickly enjoyed greatly Id say attendees seemed enjoy ing themselves too What else would ex pect 100 guys get together talk Soar ing Finally Id like thank members MARCS club putting sem inar including Chairman Bill Vogelsang Walt Seaborg Al Scidmore Tim Morgan Frank Baker Joe Imilkowskl espe cially Carl Mohs excellent taxi ser vice RC Aerobatics/Van Putte Continued page 45 attack Usually almost always wing sim ply assumes streamlined profile af fected dihedral Naturally model skidding more rudder input creased dihedral now produces its own forc es depending other force setups di hedral fuselage shape stabilizer etc good models have tested will easily fly straight line shift top bottom rudder corrections what its worth best designs exhibit least corkscrewing altitude loss always have lots forward lateral area better put distribution fuselage side area approximates wing CG fuselage knife edge flight very close CG normally indicated Very interesting Dick Thanks got note Bud Overn Santa Ana CA wrote passing Hi Johnson no longer able get thin styrofoam sheets called white skin Through efforts George Sparr Aerospace Composite Prod ucts again available 24-in sheets ad dress PO Box 16621 Irvine CA 92714 Thanks hint Bud Modelers might also interested George has lot composite products including glass cloth Kevlar mat Aero c mar Aero k mat others Ive proba bly forgotten Drop him line As written its just before Christmas hope nice happily building away onor otherwise enjoyingyour RC oriented presents Santa might well building because its cold almost everywhere country late January panhandle Florida RC Scale/Hanft Continued page 47 possible prefer make full-stall land ing roundout effected airspeed dissi pates altitude ever slightly above runway attitude established held grad ually pulling back stick holding nose aircraft up losing airspeed until aircraft settles softly onto runway grass full Up elevator paramount point keep aircraft nosing over own misfortune point slightly before tend relax elevator rudder controland ground loop inevit able ground loop uncontrolled maneuver aircraft makes rapid turnoften full 3600—while rolling along ground conventional-geared aircraft wing tip outboard side turn can scrape ground often causing some airframe/fabric damage RMcM Scale model makes proper stall landing pretty realistic its sure bring roar spectators fellow contes tants Tricycle-gear planes follow almost same se quence except initial contact ground main gear airspeed lost nose gear gently settles through make contact runway elevator can no longer hold off have seen space shut tle return earth have watched breathlessly command pilots gently land huge craft Its like attempting landing plane full eggs Just beautiful Dont agree present flight can make differ ence between average score winning Continued page 148 ultimate question LOVESONG answer have tried latest hi-tech looking thermal competition gliders know original. Windeong better Well liked Windsong will love Lovesong Al Doig has said Lovesong finally got right High praise Indeed great modifier himself - Send 2 stamps new catalog I DOD~ON DEIiN Z1ZU Damson Road Bothell WA 98021 208-776-8067 146 Model Aviation iE1C E1 Balsa T000 Cutters OIJ 5 pc Masters Set 1/8 3/16 1/4 5/16 3/8 . $1698 3 pc Builders Set 3/161/4 5/16$998 Whether kit builder scratch builder SQUARE CUT Tools will save time Remove stubborn die cuts cut own squares slots Made US quality machined nickel plated steel Order set today See Dealer Cataloger Order dont carry Square cut Tools call us call well pay shipping US Canada D extra SOIJARE CUT Tools 4073 254-0516 905 N Harbor City Blvd Melbourne FL 32935 DeaIeg/Distributor Inquiries Invited Florida Residents Add 8% Sales Tax