GOOD NEWS Back May column asked modelers assist Jed Mottola Fairlawn NJ getting Saito 90 twin repaired almost run Out ideas after contacting several potential sources wrote assistance column reached Model Aviation ed itorial offices editor remembered other MA staffer just gotten Saito repaired A&M Aircraft Supply 18015 Crest Carrol ton TX 75006 quickly wrote directly Jed tell him Saito repair source left request assistance June column just see what would happen results got letter pictures Jed week ago has gotten Saito re paired reports got lot responses about get repairs Thanks Its nice things other really make RC modeling gratifying hobby reeeived letter Michael Heuer pres ident International Aerobatic Club IAC wrote want retain ability make quick changes well obviously warranted procedure works July IDeadline year submission proposals Known Compulsory sequences Rules Committee meets August con sider proposals recommended Known category Sportsman through Advanced published September October issue Sport Aerobatics October 15Deadline year actual proposals changes rules consid ered Rules Committee over winter usu ally January February recommenda tions made Board following March spring meeting Recommendations adopted rejected modified Board changes agreed principle final proposals summarized April issue Sport Aerobatics operate very short lead times certain sections magazine such Lines & Angles Notes information contained Members can comment proposals detail enjoyed column very much June issue Model Aviation discussion rules proposals very timely appropriate discipline sport aviation well have rules proposals year additionally complicated rules made FAI/CIVA level try stay compatible times particularly respect judging criteria Re cently adopted lengthier procedure though Mike Hayden lost Escape let get between him sun during fiight two years have foster Cajun Nats Lafayette LA didnt seem lose sense humor over however membershin input proposals course 52 Model Aviation Radio Cono Sport Aerobatics Ron Van Putte III SleEpy Oaks Rd Ft Walton Beach FL 32548 ony Stiliman Pensacola FL says Arcomaster 60 best Pattern airplane hes ever Master class contest record Southeast makes very good case claim Kit available Mutchiers HobbIes 4620 Crandaii-Lanesville Rd Corydon IN 47112 Jed Mottolas Saito 90 fourstroke finally fixed Theres long story behind thisread column now powers 7-ft.span Sky Spy L Plane used tow banners take aerial movies dummy pilot made gluing together backto-back Polaroid photos Jed Another Jeds planes originaldesign ducted fan job R Rossi 81 resides homemade tube fuselage 6 ft long time up Board meeting following No vember JanuaryFinal rules changes adopted Board put effect date con test year So far has worked well has gotten very positive reviews membership really appreciate input Michael Heuer because IAC has difficult prob lems associated rules AMA does still get job done 25% less time wouldnt believe number people called wrote about find out about Eclipse model pictures August column Since column appeared have purchased Eclipse fuselage beautiful plan construct built-up wing using computer-aided graphics compute rib shapes laser printer ob tain rib templates weight built-up wing has lighter foam-wing version Henry Pioruns waffle pattern corelightening holes Back business hand have two ad dresses manufacturer Eclipse actually produced British Columbia Canada shipments US customers made out state Washington two ad dresses High Performance Models 9556-116 St North Delta BC V4C 6Z4 Canada HP Models 494 Tyee Dr Pt Roberts WA 98281 Take pick write information Last month wrote would missing years Nats time didnt know would covering Nats Model Aviation asked recommendation substi tute reporter magazines Publisher Ed itor Carl Wheeley time didnt have Shortly afterward went Masters Tournament chatting Paul Verger Lafayette LA knew wasnt going Nats asked covering mag azine told him didnt know vol unteered After returned home called Carl recom mended ask Paul cover Nats cause read Pauls writing K-Factor newsletter National Society Radio Con trolled AerobaticsNSRCA knew could handle Paul tries come across sort comedian small town Louisiana does well intelligent perceptive mind lurks behind facade Secrets out Paul show what mean following lifted Pauls last column K-Factor wrote about factors affect judging said BIAS know dear old Halo Fac tor no doubt exists some ex tent dont feel major factor people think top fliers fly well fly smart make difficult de tect errors make main thing being Big Dog does top guys get judges attention will watch carefully No goes sleep Chips flights However mistakes made will noted good judge Bias also allows Big Dogs little room style fly creative way its considered style fly same way its considered being out step course fairbut said life fair probably handful fliers Continued page 152 FREE CATALOG Best 40 Ever 4 Channel nch Span Semi-Symmetrical Wing 25 - 40 Engine 3-3-1/2 lbs Superior Performance Available Favorite Hobby Shop Guaranteed Satisfaction FW4 ~4O Tidewoleu 4GPb J4SM IdwcMiae4 Ocal FL 32671 S eLa~A3925-C SE 45th Coufl ILfPWI rL4A4JflLI4L 4 694-3531 WASHINGTONS AMA BASE. $ r couple per nighl Free Parking Cars Free Full Breakfasts Free Metropass Sat Sun Free DC Area Map Free Harrington Hawk Cafeteria & Cafe Check day Minimum stay 2 nights _ *AMA 11th & E Streets NW Washington DC 20004 MMEMBER RATE 1-800-424-8532 628 8140 Y"Tax included October 1989 53 Designed Manufactured Charles Michael FitzDatrick Highest Quality Most Powerful INCLUDES Beautiful muffler alu prop spinner nut glow plug Double precision ball bearings Direct order Immediate UPS insured shipment $29800 plus $495 S&H Sorry no COD Send check MO FITZPATRICK 2120 BENTLEY #303 WEST LOS ANGELES CALIFORNIA 90025TEL 213-477-2092 INCLUDES MUFFLER Experienced Modelers Only Engine World Engine its Class OVaStn5rr OVt,eHoAe Me,o Center Srrtttay WOULD YOU SAW HOLE IN THIS FUSELAGE Der Svitch direct replacement on-board on/off switch radio equipment hides inside fuselage activated outside included bar magnet vibration proof reliable submers ible consumes no power easy use install Ideal scale sport float planes boats sail planes helicopters Dont ugly up fuselage Der Svitch TO BATTERY DERSVITCHBAR MAGNET CHARO NC JACK ECEIVER P00 Peo two basic models Model 1401 comes connectors use old ones $1995 Model 1402 comes connectors Futaba J G Airtronics $2995 Both models include installation instructions bar magnet Optionally available Model 1405 LED $895 red LED lamp 20 leads indicates radio state can installed instrument panel realistic effect Order Include name address specify models needed include check money order send Ragan/Barker Group 5050 Quorum Drive #741 Dallas TX 75240 Please add $250 perorderto cover UPS charges &TX residents add sales tax credit card orders call between 900 500 central M-F Please allow 2-4 weeks delivery RC Soaring/Blakeslee Continued page 149 believe products provide useful tool Sailplane fliers What MaxSoar PC-Soar Based input 30 design measurements such wingspan chord airfoil etc programs cal culate following 23 aircraft design parameters Wing area equivalent dihedral aspcct ratio recommended dihedral average chord angle incidence aerodynamic center loading Horizontal tail area average chord aspect ra tio aerodynamic center longitudinal stability fac tor Vertical tail area average chord aspect ra tio aerodynamic center tail volume sideslip stability factor Miscellaneous forward CG limit rear CG limit aircraft neutral point online help MaxSoar provides ranges average values calculated values way added Jeffs urg ing earlier letter Its thing able calculate sideslip instability factor its another have guide what should table flight speed Reynolds number tal aircraft drag coefficient sink rate lift-todrag ratio about 10 coefficient lift values generated about 50 num bers table calculating involves hundreds calculations Generating table re quires accessing data file 40 50 numbers representing performance polar airfoil being considered Incidentally currently pro vide about 70 airfoil polar data files adding data become available programs plot values can quickly understood designer MaxSoar PC-Soar allow designer overlay several aircraft polars com parison makes simple observe ef fects design changes compare different de signs see effect ballasting design course can output printer documenting design process discussing others Lee did just dream calcula tions upwe simply automated equa tions available modelers because peo ple like Martin Simons Lynn Cromer Ren Van Putte Alex Strojnik Michael Selig Blame Beron-Rawdon others published books articles aerodynamics mod els Are works last word model de sign Absolutely provide excel lent start would like address Jeffs specific com plaints mentions changing dihedral angle 200 sweeping wing 300 perform ance polars changing correct made conscious decision during writing programs disregard reduction projected area due dihedral decision based fact reduction lifting sur face 15 percent 100 dihedral average dihedral rudder-controlled Glider area reduction aileron ship 30 dihedral less 015 percent ab surd 200 dihedral reduces area 60 per cent program does calculate outlined several recent articles MA equivalent dihe dral angle based dihedral information pro vided designer equations programs indi cate effect performance due wing sweep unless affects area wingspan chord maintained wing swept area remains constant does affect perform ance according equations used would effects local angle attack various wing sections due circulation ef fects other sections what magni tude effects might dont know Jeff knows Lee would interested hear ing Jeff did mention wing sweep well horizontal vertical tail sweep correctly taken account calculation aerody namic centers neutral point tail volume etc Jeff mentions individual building up whole folders design comparisons states evaluations meaningless individ ual beta tester MaxSoar program has flown Gliders 20 years has achieved LSF Level IV needs eight-hour Slope flight Level V has participated local regional contests Great Race LSF Nats has also flown F3B quarter-final level has spent last 10 years studying model aerodynamics compiling de tailed design information has performed field tests effects ballast sink rate flying speed gracious enough let Lee use notebook design information provided airfoil polar data use libraries Since calculating virtually same parameters MaxSoar provided good check code compiling design information hand took about 10 hours per model did calculate performance polars Much time spent checking math mistakes computers dont make Now MaxSoar takes about 30 minutes including performance polars Since has flown designs documented believe him says MaxSoars calculated performance corre lates well flight experience Gliders performed relative another crux issue designer needs basis comparing design versus another believe programs provide basis As can see times mentioned above programs provide 20-to- 1 reduction time required calculate simple design pa rameters let alone performance data takes about five months build Glider few hours front computer can keep building Glider going perform expectations consider time well spent thanks John Hohensee taking time write above letter New Soaring club George Voss wrote let us know Oklahoma City Silent Fliers club now operation Sailplaners Okie City area can get information George 1403 Lincolnshire Road Oklahoma City OK 73159 telephone 1-405/793-9213 RC Aerobatics/Van Putte Continued page 53 nation can deviate normal still able score Hanno makes style rather following hes World Champion STYLE PREFERENCE isnt exactly same what Ive talking about Im talk ing about guy wants see pattern flown particular way other styles will appreciated Everyone like some degree some us very bad about know local judge likes low fast Thats worth extra point maneuver isnt fair either its human nature very difficult counter try let affect score 152 Model Aviation Introducing Invisible SvitchTM Made USA still creeps now no other reason simply looks better looks good scores high HUMAN ERROR recent contest sev eral us watching flight amaz ing hear different opinions quality maneuver would have thought watching different airplanes Yes maybe problem people will detect errorsminor onesthat other people simply will see dont see errors scores will obviously higher folks have reputations being easy judges simply dont see errors Its because arent looking because dont see mistakes training problem really eyesight perception prob lem judges usually score very high upper classes mistakes small er rors also probably affected old buddy Halo Factor think youll agree Paul Verger will have very interesting Nats report Im looking ward reading RC Giant Scale/de Vries Continued page 55 way go found Radio Shack carries torch proper oxygen cylindersso Im back business usual schedule holds next month space will taken over Nats reports Back atcha December issue probably news big IMAA to-do Odessa TX RC Old-Timers/Mathews Continued page 57 lateral area floats So would appear quite accident Dan hit design wellsuited flying off waterbut red hot traditional flying anyone interested twin floats 20 long profile much like full-scale Edo floats bottom steps located planes CG 4i/2 wide supported three wire units attached fuselage bottom cross braces two spots tail float single 8 x 3-in unit having teardrop shape mounted directly below horizontal tail plane Scorpion Major kit withdrawn market Bunch concentrated produc ing engines Later made tethered race cars speedboat kit never again pro duced model airplane kits Hisengines continued mainstay com pany until suicide 1948 Scorpion Major RC-Assist model quote Gerald Murphy Herford TX Bunch Scorpion Major powered ignition O&R 29 flies better should really wanted after watching Eut Tileston fly times contestsa real contender looked like Old-Timer Rubber job engine has character gear legs built using six pieces balsa wheels balsa cores surgical tubing tires turned out about 6 oz overweight smaller batteries some other mods still 3 oz over shows difficult get smaller model down 10 oz/sq ft Continued page 1S7 LANDER INDUST 1005 19TH 5T CT VISA HAVAC MONTANA 59501 406-265-6529 BUILDING BOARD 24x72$5395NtLFRT 24x48$4495NcLFRT CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surfate bonded 3/4' laminated warp free base straight true work surtace will last years years J * ***** * ****** * * * ** *** ** *** * * * * * WANDIT * N *Dealers Invited * *wile ysirwarranty *p * * or Dry 1OftCORD~ * * Stick Abrasives p *A KeenMachine gives ecceptional *sandingcontrol excellent finish * * 89Basic Ccl 1 flat Wand 1 *of 6 grits *10395Builder Special mcI 2 tlat hatt *round wand 5 6 grits *12995Deluxe includes 3 flat 2 half p *round wands 2 buff wands *tO 6 grits * *Addilionaf wands Abrasives available *See local hobby shop *WANDITOMFG. I44OS916O *p * P09515183Ddu1flt752sI51pp October 1989 153 L- 1
Edition: Model Aviation - 1989/10
Page Numbers: 52, 53, 152, 153
GOOD NEWS Back May column asked modelers assist Jed Mottola Fairlawn NJ getting Saito 90 twin repaired almost run Out ideas after contacting several potential sources wrote assistance column reached Model Aviation ed itorial offices editor remembered other MA staffer just gotten Saito repaired A&M Aircraft Supply 18015 Crest Carrol ton TX 75006 quickly wrote directly Jed tell him Saito repair source left request assistance June column just see what would happen results got letter pictures Jed week ago has gotten Saito re paired reports got lot responses about get repairs Thanks Its nice things other really make RC modeling gratifying hobby reeeived letter Michael Heuer pres ident International Aerobatic Club IAC wrote want retain ability make quick changes well obviously warranted procedure works July IDeadline year submission proposals Known Compulsory sequences Rules Committee meets August con sider proposals recommended Known category Sportsman through Advanced published September October issue Sport Aerobatics October 15Deadline year actual proposals changes rules consid ered Rules Committee over winter usu ally January February recommenda tions made Board following March spring meeting Recommendations adopted rejected modified Board changes agreed principle final proposals summarized April issue Sport Aerobatics operate very short lead times certain sections magazine such Lines & Angles Notes information contained Members can comment proposals detail enjoyed column very much June issue Model Aviation discussion rules proposals very timely appropriate discipline sport aviation well have rules proposals year additionally complicated rules made FAI/CIVA level try stay compatible times particularly respect judging criteria Re cently adopted lengthier procedure though Mike Hayden lost Escape let get between him sun during fiight two years have foster Cajun Nats Lafayette LA didnt seem lose sense humor over however membershin input proposals course 52 Model Aviation Radio Cono Sport Aerobatics Ron Van Putte III SleEpy Oaks Rd Ft Walton Beach FL 32548 ony Stiliman Pensacola FL says Arcomaster 60 best Pattern airplane hes ever Master class contest record Southeast makes very good case claim Kit available Mutchiers HobbIes 4620 Crandaii-Lanesville Rd Corydon IN 47112 Jed Mottolas Saito 90 fourstroke finally fixed Theres long story behind thisread column now powers 7-ft.span Sky Spy L Plane used tow banners take aerial movies dummy pilot made gluing together backto-back Polaroid photos Jed Another Jeds planes originaldesign ducted fan job R Rossi 81 resides homemade tube fuselage 6 ft long time up Board meeting following No vember JanuaryFinal rules changes adopted Board put effect date con test year So far has worked well has gotten very positive reviews membership really appreciate input Michael Heuer because IAC has difficult prob lems associated rules AMA does still get job done 25% less time wouldnt believe number people called wrote about find out about Eclipse model pictures August column Since column appeared have purchased Eclipse fuselage beautiful plan construct built-up wing using computer-aided graphics compute rib shapes laser printer ob tain rib templates weight built-up wing has lighter foam-wing version Henry Pioruns waffle pattern corelightening holes Back business hand have two ad dresses manufacturer Eclipse actually produced British Columbia Canada shipments US customers made out state Washington two ad dresses High Performance Models 9556-116 St North Delta BC V4C 6Z4 Canada HP Models 494 Tyee Dr Pt Roberts WA 98281 Take pick write information Last month wrote would missing years Nats time didnt know would covering Nats Model Aviation asked recommendation substi tute reporter magazines Publisher Ed itor Carl Wheeley time didnt have Shortly afterward went Masters Tournament chatting Paul Verger Lafayette LA knew wasnt going Nats asked covering mag azine told him didnt know vol unteered After returned home called Carl recom mended ask Paul cover Nats cause read Pauls writing K-Factor newsletter National Society Radio Con trolled AerobaticsNSRCA knew could handle Paul tries come across sort comedian small town Louisiana does well intelligent perceptive mind lurks behind facade Secrets out Paul show what mean following lifted Pauls last column K-Factor wrote about factors affect judging said BIAS know dear old Halo Fac tor no doubt exists some ex tent dont feel major factor people think top fliers fly well fly smart make difficult de tect errors make main thing being Big Dog does top guys get judges attention will watch carefully No goes sleep Chips flights However mistakes made will noted good judge Bias also allows Big Dogs little room style fly creative way its considered style fly same way its considered being out step course fairbut said life fair probably handful fliers Continued page 152 FREE CATALOG Best 40 Ever 4 Channel nch Span Semi-Symmetrical Wing 25 - 40 Engine 3-3-1/2 lbs Superior Performance Available Favorite Hobby Shop Guaranteed Satisfaction FW4 ~4O Tidewoleu 4GPb J4SM IdwcMiae4 Ocal FL 32671 S eLa~A3925-C SE 45th Coufl ILfPWI rL4A4JflLI4L 4 694-3531 WASHINGTONS AMA BASE. $ r couple per nighl Free Parking Cars Free Full Breakfasts Free Metropass Sat Sun Free DC Area Map Free Harrington Hawk Cafeteria & Cafe Check day Minimum stay 2 nights _ *AMA 11th & E Streets NW Washington DC 20004 MMEMBER RATE 1-800-424-8532 628 8140 Y"Tax included October 1989 53 Designed Manufactured Charles Michael FitzDatrick Highest Quality Most Powerful INCLUDES Beautiful muffler alu prop spinner nut glow plug Double precision ball bearings Direct order Immediate UPS insured shipment $29800 plus $495 S&H Sorry no COD Send check MO FITZPATRICK 2120 BENTLEY #303 WEST LOS ANGELES CALIFORNIA 90025TEL 213-477-2092 INCLUDES MUFFLER Experienced Modelers Only Engine World Engine its Class OVaStn5rr OVt,eHoAe Me,o Center Srrtttay WOULD YOU SAW HOLE IN THIS FUSELAGE Der Svitch direct replacement on-board on/off switch radio equipment hides inside fuselage activated outside included bar magnet vibration proof reliable submers ible consumes no power easy use install Ideal scale sport float planes boats sail planes helicopters Dont ugly up fuselage Der Svitch TO BATTERY DERSVITCHBAR MAGNET CHARO NC JACK ECEIVER P00 Peo two basic models Model 1401 comes connectors use old ones $1995 Model 1402 comes connectors Futaba J G Airtronics $2995 Both models include installation instructions bar magnet Optionally available Model 1405 LED $895 red LED lamp 20 leads indicates radio state can installed instrument panel realistic effect Order Include name address specify models needed include check money order send Ragan/Barker Group 5050 Quorum Drive #741 Dallas TX 75240 Please add $250 perorderto cover UPS charges &TX residents add sales tax credit card orders call between 900 500 central M-F Please allow 2-4 weeks delivery RC Soaring/Blakeslee Continued page 149 believe products provide useful tool Sailplane fliers What MaxSoar PC-Soar Based input 30 design measurements such wingspan chord airfoil etc programs cal culate following 23 aircraft design parameters Wing area equivalent dihedral aspcct ratio recommended dihedral average chord angle incidence aerodynamic center loading Horizontal tail area average chord aspect ra tio aerodynamic center longitudinal stability fac tor Vertical tail area average chord aspect ra tio aerodynamic center tail volume sideslip stability factor Miscellaneous forward CG limit rear CG limit aircraft neutral point online help MaxSoar provides ranges average values calculated values way added Jeffs urg ing earlier letter Its thing able calculate sideslip instability factor its another have guide what should table flight speed Reynolds number tal aircraft drag coefficient sink rate lift-todrag ratio about 10 coefficient lift values generated about 50 num bers table calculating involves hundreds calculations Generating table re quires accessing data file 40 50 numbers representing performance polar airfoil being considered Incidentally currently pro vide about 70 airfoil polar data files adding data become available programs plot values can quickly understood designer MaxSoar PC-Soar allow designer overlay several aircraft polars com parison makes simple observe ef fects design changes compare different de signs see effect ballasting design course can output printer documenting design process discussing others Lee did just dream calcula tions upwe simply automated equa tions available modelers because peo ple like Martin Simons Lynn Cromer Ren Van Putte Alex Strojnik Michael Selig Blame Beron-Rawdon others published books articles aerodynamics mod els Are works last word model de sign Absolutely provide excel lent start would like address Jeffs specific com plaints mentions changing dihedral angle 200 sweeping wing 300 perform ance polars changing correct made conscious decision during writing programs disregard reduction projected area due dihedral decision based fact reduction lifting sur face 15 percent 100 dihedral average dihedral rudder-controlled Glider area reduction aileron ship 30 dihedral less 015 percent ab surd 200 dihedral reduces area 60 per cent program does calculate outlined several recent articles MA equivalent dihe dral angle based dihedral information pro vided designer equations programs indi cate effect performance due wing sweep unless affects area wingspan chord maintained wing swept area remains constant does affect perform ance according equations used would effects local angle attack various wing sections due circulation ef fects other sections what magni tude effects might dont know Jeff knows Lee would interested hear ing Jeff did mention wing sweep well horizontal vertical tail sweep correctly taken account calculation aerody namic centers neutral point tail volume etc Jeff mentions individual building up whole folders design comparisons states evaluations meaningless individ ual beta tester MaxSoar program has flown Gliders 20 years has achieved LSF Level IV needs eight-hour Slope flight Level V has participated local regional contests Great Race LSF Nats has also flown F3B quarter-final level has spent last 10 years studying model aerodynamics compiling de tailed design information has performed field tests effects ballast sink rate flying speed gracious enough let Lee use notebook design information provided airfoil polar data use libraries Since calculating virtually same parameters MaxSoar provided good check code compiling design information hand took about 10 hours per model did calculate performance polars Much time spent checking math mistakes computers dont make Now MaxSoar takes about 30 minutes including performance polars Since has flown designs documented believe him says MaxSoars calculated performance corre lates well flight experience Gliders performed relative another crux issue designer needs basis comparing design versus another believe programs provide basis As can see times mentioned above programs provide 20-to- 1 reduction time required calculate simple design pa rameters let alone performance data takes about five months build Glider few hours front computer can keep building Glider going perform expectations consider time well spent thanks John Hohensee taking time write above letter New Soaring club George Voss wrote let us know Oklahoma City Silent Fliers club now operation Sailplaners Okie City area can get information George 1403 Lincolnshire Road Oklahoma City OK 73159 telephone 1-405/793-9213 RC Aerobatics/Van Putte Continued page 53 nation can deviate normal still able score Hanno makes style rather following hes World Champion STYLE PREFERENCE isnt exactly same what Ive talking about Im talk ing about guy wants see pattern flown particular way other styles will appreciated Everyone like some degree some us very bad about know local judge likes low fast Thats worth extra point maneuver isnt fair either its human nature very difficult counter try let affect score 152 Model Aviation Introducing Invisible SvitchTM Made USA still creeps now no other reason simply looks better looks good scores high HUMAN ERROR recent contest sev eral us watching flight amaz ing hear different opinions quality maneuver would have thought watching different airplanes Yes maybe problem people will detect errorsminor onesthat other people simply will see dont see errors scores will obviously higher folks have reputations being easy judges simply dont see errors Its because arent looking because dont see mistakes training problem really eyesight perception prob lem judges usually score very high upper classes mistakes small er rors also probably affected old buddy Halo Factor think youll agree Paul Verger will have very interesting Nats report Im looking ward reading RC Giant Scale/de Vries Continued page 55 way go found Radio Shack carries torch proper oxygen cylindersso Im back business usual schedule holds next month space will taken over Nats reports Back atcha December issue probably news big IMAA to-do Odessa TX RC Old-Timers/Mathews Continued page 57 lateral area floats So would appear quite accident Dan hit design wellsuited flying off waterbut red hot traditional flying anyone interested twin floats 20 long profile much like full-scale Edo floats bottom steps located planes CG 4i/2 wide supported three wire units attached fuselage bottom cross braces two spots tail float single 8 x 3-in unit having teardrop shape mounted directly below horizontal tail plane Scorpion Major kit withdrawn market Bunch concentrated produc ing engines Later made tethered race cars speedboat kit never again pro duced model airplane kits Hisengines continued mainstay com pany until suicide 1948 Scorpion Major RC-Assist model quote Gerald Murphy Herford TX Bunch Scorpion Major powered ignition O&R 29 flies better should really wanted after watching Eut Tileston fly times contestsa real contender looked like Old-Timer Rubber job engine has character gear legs built using six pieces balsa wheels balsa cores surgical tubing tires turned out about 6 oz overweight smaller batteries some other mods still 3 oz over shows difficult get smaller model down 10 oz/sq ft Continued page 1S7 LANDER INDUST 1005 19TH 5T CT VISA HAVAC MONTANA 59501 406-265-6529 BUILDING BOARD 24x72$5395NtLFRT 24x48$4495NcLFRT CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surfate bonded 3/4' laminated warp free base straight true work surtace will last years years J * ***** * ****** * * * ** *** ** *** * * * * * WANDIT * N *Dealers Invited * *wile ysirwarranty *p * * or Dry 1OftCORD~ * * Stick Abrasives p *A KeenMachine gives ecceptional *sandingcontrol excellent finish * * 89Basic Ccl 1 flat Wand 1 *of 6 grits *10395Builder Special mcI 2 tlat hatt *round wand 5 6 grits *12995Deluxe includes 3 flat 2 half p *round wands 2 buff wands *tO 6 grits * *Addilionaf wands Abrasives available *See local hobby shop *WANDITOMFG. I44OS916O *p * P09515183Ddu1flt752sI51pp October 1989 153 L- 1
Edition: Model Aviation - 1989/10
Page Numbers: 52, 53, 152, 153
GOOD NEWS Back May column asked modelers assist Jed Mottola Fairlawn NJ getting Saito 90 twin repaired almost run Out ideas after contacting several potential sources wrote assistance column reached Model Aviation ed itorial offices editor remembered other MA staffer just gotten Saito repaired A&M Aircraft Supply 18015 Crest Carrol ton TX 75006 quickly wrote directly Jed tell him Saito repair source left request assistance June column just see what would happen results got letter pictures Jed week ago has gotten Saito re paired reports got lot responses about get repairs Thanks Its nice things other really make RC modeling gratifying hobby reeeived letter Michael Heuer pres ident International Aerobatic Club IAC wrote want retain ability make quick changes well obviously warranted procedure works July IDeadline year submission proposals Known Compulsory sequences Rules Committee meets August con sider proposals recommended Known category Sportsman through Advanced published September October issue Sport Aerobatics October 15Deadline year actual proposals changes rules consid ered Rules Committee over winter usu ally January February recommenda tions made Board following March spring meeting Recommendations adopted rejected modified Board changes agreed principle final proposals summarized April issue Sport Aerobatics operate very short lead times certain sections magazine such Lines & Angles Notes information contained Members can comment proposals detail enjoyed column very much June issue Model Aviation discussion rules proposals very timely appropriate discipline sport aviation well have rules proposals year additionally complicated rules made FAI/CIVA level try stay compatible times particularly respect judging criteria Re cently adopted lengthier procedure though Mike Hayden lost Escape let get between him sun during fiight two years have foster Cajun Nats Lafayette LA didnt seem lose sense humor over however membershin input proposals course 52 Model Aviation Radio Cono Sport Aerobatics Ron Van Putte III SleEpy Oaks Rd Ft Walton Beach FL 32548 ony Stiliman Pensacola FL says Arcomaster 60 best Pattern airplane hes ever Master class contest record Southeast makes very good case claim Kit available Mutchiers HobbIes 4620 Crandaii-Lanesville Rd Corydon IN 47112 Jed Mottolas Saito 90 fourstroke finally fixed Theres long story behind thisread column now powers 7-ft.span Sky Spy L Plane used tow banners take aerial movies dummy pilot made gluing together backto-back Polaroid photos Jed Another Jeds planes originaldesign ducted fan job R Rossi 81 resides homemade tube fuselage 6 ft long time up Board meeting following No vember JanuaryFinal rules changes adopted Board put effect date con test year So far has worked well has gotten very positive reviews membership really appreciate input Michael Heuer because IAC has difficult prob lems associated rules AMA does still get job done 25% less time wouldnt believe number people called wrote about find out about Eclipse model pictures August column Since column appeared have purchased Eclipse fuselage beautiful plan construct built-up wing using computer-aided graphics compute rib shapes laser printer ob tain rib templates weight built-up wing has lighter foam-wing version Henry Pioruns waffle pattern corelightening holes Back business hand have two ad dresses manufacturer Eclipse actually produced British Columbia Canada shipments US customers made out state Washington two ad dresses High Performance Models 9556-116 St North Delta BC V4C 6Z4 Canada HP Models 494 Tyee Dr Pt Roberts WA 98281 Take pick write information Last month wrote would missing years Nats time didnt know would covering Nats Model Aviation asked recommendation substi tute reporter magazines Publisher Ed itor Carl Wheeley time didnt have Shortly afterward went Masters Tournament chatting Paul Verger Lafayette LA knew wasnt going Nats asked covering mag azine told him didnt know vol unteered After returned home called Carl recom mended ask Paul cover Nats cause read Pauls writing K-Factor newsletter National Society Radio Con trolled AerobaticsNSRCA knew could handle Paul tries come across sort comedian small town Louisiana does well intelligent perceptive mind lurks behind facade Secrets out Paul show what mean following lifted Pauls last column K-Factor wrote about factors affect judging said BIAS know dear old Halo Fac tor no doubt exists some ex tent dont feel major factor people think top fliers fly well fly smart make difficult de tect errors make main thing being Big Dog does top guys get judges attention will watch carefully No goes sleep Chips flights However mistakes made will noted good judge Bias also allows Big Dogs little room style fly creative way its considered style fly same way its considered being out step course fairbut said life fair probably handful fliers Continued page 152 FREE CATALOG Best 40 Ever 4 Channel nch Span Semi-Symmetrical Wing 25 - 40 Engine 3-3-1/2 lbs Superior Performance Available Favorite Hobby Shop Guaranteed Satisfaction FW4 ~4O Tidewoleu 4GPb J4SM IdwcMiae4 Ocal FL 32671 S eLa~A3925-C SE 45th Coufl ILfPWI rL4A4JflLI4L 4 694-3531 WASHINGTONS AMA BASE. $ r couple per nighl Free Parking Cars Free Full Breakfasts Free Metropass Sat Sun Free DC Area Map Free Harrington Hawk Cafeteria & Cafe Check day Minimum stay 2 nights _ *AMA 11th & E Streets NW Washington DC 20004 MMEMBER RATE 1-800-424-8532 628 8140 Y"Tax included October 1989 53 Designed Manufactured Charles Michael FitzDatrick Highest Quality Most Powerful INCLUDES Beautiful muffler alu prop spinner nut glow plug Double precision ball bearings Direct order Immediate UPS insured shipment $29800 plus $495 S&H Sorry no COD Send check MO FITZPATRICK 2120 BENTLEY #303 WEST LOS ANGELES CALIFORNIA 90025TEL 213-477-2092 INCLUDES MUFFLER Experienced Modelers Only Engine World Engine its Class OVaStn5rr OVt,eHoAe Me,o Center Srrtttay WOULD YOU SAW HOLE IN THIS FUSELAGE Der Svitch direct replacement on-board on/off switch radio equipment hides inside fuselage activated outside included bar magnet vibration proof reliable submers ible consumes no power easy use install Ideal scale sport float planes boats sail planes helicopters Dont ugly up fuselage Der Svitch TO BATTERY DERSVITCHBAR MAGNET CHARO NC JACK ECEIVER P00 Peo two basic models Model 1401 comes connectors use old ones $1995 Model 1402 comes connectors Futaba J G Airtronics $2995 Both models include installation instructions bar magnet Optionally available Model 1405 LED $895 red LED lamp 20 leads indicates radio state can installed instrument panel realistic effect Order Include name address specify models needed include check money order send Ragan/Barker Group 5050 Quorum Drive #741 Dallas TX 75240 Please add $250 perorderto cover UPS charges &TX residents add sales tax credit card orders call between 900 500 central M-F Please allow 2-4 weeks delivery RC Soaring/Blakeslee Continued page 149 believe products provide useful tool Sailplane fliers What MaxSoar PC-Soar Based input 30 design measurements such wingspan chord airfoil etc programs cal culate following 23 aircraft design parameters Wing area equivalent dihedral aspcct ratio recommended dihedral average chord angle incidence aerodynamic center loading Horizontal tail area average chord aspect ra tio aerodynamic center longitudinal stability fac tor Vertical tail area average chord aspect ra tio aerodynamic center tail volume sideslip stability factor Miscellaneous forward CG limit rear CG limit aircraft neutral point online help MaxSoar provides ranges average values calculated values way added Jeffs urg ing earlier letter Its thing able calculate sideslip instability factor its another have guide what should table flight speed Reynolds number tal aircraft drag coefficient sink rate lift-todrag ratio about 10 coefficient lift values generated about 50 num bers table calculating involves hundreds calculations Generating table re quires accessing data file 40 50 numbers representing performance polar airfoil being considered Incidentally currently pro vide about 70 airfoil polar data files adding data become available programs plot values can quickly understood designer MaxSoar PC-Soar allow designer overlay several aircraft polars com parison makes simple observe ef fects design changes compare different de signs see effect ballasting design course can output printer documenting design process discussing others Lee did just dream calcula tions upwe simply automated equa tions available modelers because peo ple like Martin Simons Lynn Cromer Ren Van Putte Alex Strojnik Michael Selig Blame Beron-Rawdon others published books articles aerodynamics mod els Are works last word model de sign Absolutely provide excel lent start would like address Jeffs specific com plaints mentions changing dihedral angle 200 sweeping wing 300 perform ance polars changing correct made conscious decision during writing programs disregard reduction projected area due dihedral decision based fact reduction lifting sur face 15 percent 100 dihedral average dihedral rudder-controlled Glider area reduction aileron ship 30 dihedral less 015 percent ab surd 200 dihedral reduces area 60 per cent program does calculate outlined several recent articles MA equivalent dihe dral angle based dihedral information pro vided designer equations programs indi cate effect performance due wing sweep unless affects area wingspan chord maintained wing swept area remains constant does affect perform ance according equations used would effects local angle attack various wing sections due circulation ef fects other sections what magni tude effects might dont know Jeff knows Lee would interested hear ing Jeff did mention wing sweep well horizontal vertical tail sweep correctly taken account calculation aerody namic centers neutral point tail volume etc Jeff mentions individual building up whole folders design comparisons states evaluations meaningless individ ual beta tester MaxSoar program has flown Gliders 20 years has achieved LSF Level IV needs eight-hour Slope flight Level V has participated local regional contests Great Race LSF Nats has also flown F3B quarter-final level has spent last 10 years studying model aerodynamics compiling de tailed design information has performed field tests effects ballast sink rate flying speed gracious enough let Lee use notebook design information provided airfoil polar data use libraries Since calculating virtually same parameters MaxSoar provided good check code compiling design information hand took about 10 hours per model did calculate performance polars Much time spent checking math mistakes computers dont make Now MaxSoar takes about 30 minutes including performance polars Since has flown designs documented believe him says MaxSoars calculated performance corre lates well flight experience Gliders performed relative another crux issue designer needs basis comparing design versus another believe programs provide basis As can see times mentioned above programs provide 20-to- 1 reduction time required calculate simple design pa rameters let alone performance data takes about five months build Glider few hours front computer can keep building Glider going perform expectations consider time well spent thanks John Hohensee taking time write above letter New Soaring club George Voss wrote let us know Oklahoma City Silent Fliers club now operation Sailplaners Okie City area can get information George 1403 Lincolnshire Road Oklahoma City OK 73159 telephone 1-405/793-9213 RC Aerobatics/Van Putte Continued page 53 nation can deviate normal still able score Hanno makes style rather following hes World Champion STYLE PREFERENCE isnt exactly same what Ive talking about Im talk ing about guy wants see pattern flown particular way other styles will appreciated Everyone like some degree some us very bad about know local judge likes low fast Thats worth extra point maneuver isnt fair either its human nature very difficult counter try let affect score 152 Model Aviation Introducing Invisible SvitchTM Made USA still creeps now no other reason simply looks better looks good scores high HUMAN ERROR recent contest sev eral us watching flight amaz ing hear different opinions quality maneuver would have thought watching different airplanes Yes maybe problem people will detect errorsminor onesthat other people simply will see dont see errors scores will obviously higher folks have reputations being easy judges simply dont see errors Its because arent looking because dont see mistakes training problem really eyesight perception prob lem judges usually score very high upper classes mistakes small er rors also probably affected old buddy Halo Factor think youll agree Paul Verger will have very interesting Nats report Im looking ward reading RC Giant Scale/de Vries Continued page 55 way go found Radio Shack carries torch proper oxygen cylindersso Im back business usual schedule holds next month space will taken over Nats reports Back atcha December issue probably news big IMAA to-do Odessa TX RC Old-Timers/Mathews Continued page 57 lateral area floats So would appear quite accident Dan hit design wellsuited flying off waterbut red hot traditional flying anyone interested twin floats 20 long profile much like full-scale Edo floats bottom steps located planes CG 4i/2 wide supported three wire units attached fuselage bottom cross braces two spots tail float single 8 x 3-in unit having teardrop shape mounted directly below horizontal tail plane Scorpion Major kit withdrawn market Bunch concentrated produc ing engines Later made tethered race cars speedboat kit never again pro duced model airplane kits Hisengines continued mainstay com pany until suicide 1948 Scorpion Major RC-Assist model quote Gerald Murphy Herford TX Bunch Scorpion Major powered ignition O&R 29 flies better should really wanted after watching Eut Tileston fly times contestsa real contender looked like Old-Timer Rubber job engine has character gear legs built using six pieces balsa wheels balsa cores surgical tubing tires turned out about 6 oz overweight smaller batteries some other mods still 3 oz over shows difficult get smaller model down 10 oz/sq ft Continued page 1S7 LANDER INDUST 1005 19TH 5T CT VISA HAVAC MONTANA 59501 406-265-6529 BUILDING BOARD 24x72$5395NtLFRT 24x48$4495NcLFRT CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surfate bonded 3/4' laminated warp free base straight true work surtace will last years years J * ***** * ****** * * * ** *** ** *** * * * * * WANDIT * N *Dealers Invited * *wile ysirwarranty *p * * or Dry 1OftCORD~ * * Stick Abrasives p *A KeenMachine gives ecceptional *sandingcontrol excellent finish * * 89Basic Ccl 1 flat Wand 1 *of 6 grits *10395Builder Special mcI 2 tlat hatt *round wand 5 6 grits *12995Deluxe includes 3 flat 2 half p *round wands 2 buff wands *tO 6 grits * *Addilionaf wands Abrasives available *See local hobby shop *WANDITOMFG. I44OS916O *p * P09515183Ddu1flt752sI51pp October 1989 153 L- 1
Edition: Model Aviation - 1989/10
Page Numbers: 52, 53, 152, 153
GOOD NEWS Back May column asked modelers assist Jed Mottola Fairlawn NJ getting Saito 90 twin repaired almost run Out ideas after contacting several potential sources wrote assistance column reached Model Aviation ed itorial offices editor remembered other MA staffer just gotten Saito repaired A&M Aircraft Supply 18015 Crest Carrol ton TX 75006 quickly wrote directly Jed tell him Saito repair source left request assistance June column just see what would happen results got letter pictures Jed week ago has gotten Saito re paired reports got lot responses about get repairs Thanks Its nice things other really make RC modeling gratifying hobby reeeived letter Michael Heuer pres ident International Aerobatic Club IAC wrote want retain ability make quick changes well obviously warranted procedure works July IDeadline year submission proposals Known Compulsory sequences Rules Committee meets August con sider proposals recommended Known category Sportsman through Advanced published September October issue Sport Aerobatics October 15Deadline year actual proposals changes rules consid ered Rules Committee over winter usu ally January February recommenda tions made Board following March spring meeting Recommendations adopted rejected modified Board changes agreed principle final proposals summarized April issue Sport Aerobatics operate very short lead times certain sections magazine such Lines & Angles Notes information contained Members can comment proposals detail enjoyed column very much June issue Model Aviation discussion rules proposals very timely appropriate discipline sport aviation well have rules proposals year additionally complicated rules made FAI/CIVA level try stay compatible times particularly respect judging criteria Re cently adopted lengthier procedure though Mike Hayden lost Escape let get between him sun during fiight two years have foster Cajun Nats Lafayette LA didnt seem lose sense humor over however membershin input proposals course 52 Model Aviation Radio Cono Sport Aerobatics Ron Van Putte III SleEpy Oaks Rd Ft Walton Beach FL 32548 ony Stiliman Pensacola FL says Arcomaster 60 best Pattern airplane hes ever Master class contest record Southeast makes very good case claim Kit available Mutchiers HobbIes 4620 Crandaii-Lanesville Rd Corydon IN 47112 Jed Mottolas Saito 90 fourstroke finally fixed Theres long story behind thisread column now powers 7-ft.span Sky Spy L Plane used tow banners take aerial movies dummy pilot made gluing together backto-back Polaroid photos Jed Another Jeds planes originaldesign ducted fan job R Rossi 81 resides homemade tube fuselage 6 ft long time up Board meeting following No vember JanuaryFinal rules changes adopted Board put effect date con test year So far has worked well has gotten very positive reviews membership really appreciate input Michael Heuer because IAC has difficult prob lems associated rules AMA does still get job done 25% less time wouldnt believe number people called wrote about find out about Eclipse model pictures August column Since column appeared have purchased Eclipse fuselage beautiful plan construct built-up wing using computer-aided graphics compute rib shapes laser printer ob tain rib templates weight built-up wing has lighter foam-wing version Henry Pioruns waffle pattern corelightening holes Back business hand have two ad dresses manufacturer Eclipse actually produced British Columbia Canada shipments US customers made out state Washington two ad dresses High Performance Models 9556-116 St North Delta BC V4C 6Z4 Canada HP Models 494 Tyee Dr Pt Roberts WA 98281 Take pick write information Last month wrote would missing years Nats time didnt know would covering Nats Model Aviation asked recommendation substi tute reporter magazines Publisher Ed itor Carl Wheeley time didnt have Shortly afterward went Masters Tournament chatting Paul Verger Lafayette LA knew wasnt going Nats asked covering mag azine told him didnt know vol unteered After returned home called Carl recom mended ask Paul cover Nats cause read Pauls writing K-Factor newsletter National Society Radio Con trolled AerobaticsNSRCA knew could handle Paul tries come across sort comedian small town Louisiana does well intelligent perceptive mind lurks behind facade Secrets out Paul show what mean following lifted Pauls last column K-Factor wrote about factors affect judging said BIAS know dear old Halo Fac tor no doubt exists some ex tent dont feel major factor people think top fliers fly well fly smart make difficult de tect errors make main thing being Big Dog does top guys get judges attention will watch carefully No goes sleep Chips flights However mistakes made will noted good judge Bias also allows Big Dogs little room style fly creative way its considered style fly same way its considered being out step course fairbut said life fair probably handful fliers Continued page 152 FREE CATALOG Best 40 Ever 4 Channel nch Span Semi-Symmetrical Wing 25 - 40 Engine 3-3-1/2 lbs Superior Performance Available Favorite Hobby Shop Guaranteed Satisfaction FW4 ~4O Tidewoleu 4GPb J4SM IdwcMiae4 Ocal FL 32671 S eLa~A3925-C SE 45th Coufl ILfPWI rL4A4JflLI4L 4 694-3531 WASHINGTONS AMA BASE. $ r couple per nighl Free Parking Cars Free Full Breakfasts Free Metropass Sat Sun Free DC Area Map Free Harrington Hawk Cafeteria & Cafe Check day Minimum stay 2 nights _ *AMA 11th & E Streets NW Washington DC 20004 MMEMBER RATE 1-800-424-8532 628 8140 Y"Tax included October 1989 53 Designed Manufactured Charles Michael FitzDatrick Highest Quality Most Powerful INCLUDES Beautiful muffler alu prop spinner nut glow plug Double precision ball bearings Direct order Immediate UPS insured shipment $29800 plus $495 S&H Sorry no COD Send check MO FITZPATRICK 2120 BENTLEY #303 WEST LOS ANGELES CALIFORNIA 90025TEL 213-477-2092 INCLUDES MUFFLER Experienced Modelers Only Engine World Engine its Class OVaStn5rr OVt,eHoAe Me,o Center Srrtttay WOULD YOU SAW HOLE IN THIS FUSELAGE Der Svitch direct replacement on-board on/off switch radio equipment hides inside fuselage activated outside included bar magnet vibration proof reliable submers ible consumes no power easy use install Ideal scale sport float planes boats sail planes helicopters Dont ugly up fuselage Der Svitch TO BATTERY DERSVITCHBAR MAGNET CHARO NC JACK ECEIVER P00 Peo two basic models Model 1401 comes connectors use old ones $1995 Model 1402 comes connectors Futaba J G Airtronics $2995 Both models include installation instructions bar magnet Optionally available Model 1405 LED $895 red LED lamp 20 leads indicates radio state can installed instrument panel realistic effect Order Include name address specify models needed include check money order send Ragan/Barker Group 5050 Quorum Drive #741 Dallas TX 75240 Please add $250 perorderto cover UPS charges &TX residents add sales tax credit card orders call between 900 500 central M-F Please allow 2-4 weeks delivery RC Soaring/Blakeslee Continued page 149 believe products provide useful tool Sailplane fliers What MaxSoar PC-Soar Based input 30 design measurements such wingspan chord airfoil etc programs cal culate following 23 aircraft design parameters Wing area equivalent dihedral aspcct ratio recommended dihedral average chord angle incidence aerodynamic center loading Horizontal tail area average chord aspect ra tio aerodynamic center longitudinal stability fac tor Vertical tail area average chord aspect ra tio aerodynamic center tail volume sideslip stability factor Miscellaneous forward CG limit rear CG limit aircraft neutral point online help MaxSoar provides ranges average values calculated values way added Jeffs urg ing earlier letter Its thing able calculate sideslip instability factor its another have guide what should table flight speed Reynolds number tal aircraft drag coefficient sink rate lift-todrag ratio about 10 coefficient lift values generated about 50 num bers table calculating involves hundreds calculations Generating table re quires accessing data file 40 50 numbers representing performance polar airfoil being considered Incidentally currently pro vide about 70 airfoil polar data files adding data become available programs plot values can quickly understood designer MaxSoar PC-Soar allow designer overlay several aircraft polars com parison makes simple observe ef fects design changes compare different de signs see effect ballasting design course can output printer documenting design process discussing others Lee did just dream calcula tions upwe simply automated equa tions available modelers because peo ple like Martin Simons Lynn Cromer Ren Van Putte Alex Strojnik Michael Selig Blame Beron-Rawdon others published books articles aerodynamics mod els Are works last word model de sign Absolutely provide excel lent start would like address Jeffs specific com plaints mentions changing dihedral angle 200 sweeping wing 300 perform ance polars changing correct made conscious decision during writing programs disregard reduction projected area due dihedral decision based fact reduction lifting sur face 15 percent 100 dihedral average dihedral rudder-controlled Glider area reduction aileron ship 30 dihedral less 015 percent ab surd 200 dihedral reduces area 60 per cent program does calculate outlined several recent articles MA equivalent dihe dral angle based dihedral information pro vided designer equations programs indi cate effect performance due wing sweep unless affects area wingspan chord maintained wing swept area remains constant does affect perform ance according equations used would effects local angle attack various wing sections due circulation ef fects other sections what magni tude effects might dont know Jeff knows Lee would interested hear ing Jeff did mention wing sweep well horizontal vertical tail sweep correctly taken account calculation aerody namic centers neutral point tail volume etc Jeff mentions individual building up whole folders design comparisons states evaluations meaningless individ ual beta tester MaxSoar program has flown Gliders 20 years has achieved LSF Level IV needs eight-hour Slope flight Level V has participated local regional contests Great Race LSF Nats has also flown F3B quarter-final level has spent last 10 years studying model aerodynamics compiling de tailed design information has performed field tests effects ballast sink rate flying speed gracious enough let Lee use notebook design information provided airfoil polar data use libraries Since calculating virtually same parameters MaxSoar provided good check code compiling design information hand took about 10 hours per model did calculate performance polars Much time spent checking math mistakes computers dont make Now MaxSoar takes about 30 minutes including performance polars Since has flown designs documented believe him says MaxSoars calculated performance corre lates well flight experience Gliders performed relative another crux issue designer needs basis comparing design versus another believe programs provide basis As can see times mentioned above programs provide 20-to- 1 reduction time required calculate simple design pa rameters let alone performance data takes about five months build Glider few hours front computer can keep building Glider going perform expectations consider time well spent thanks John Hohensee taking time write above letter New Soaring club George Voss wrote let us know Oklahoma City Silent Fliers club now operation Sailplaners Okie City area can get information George 1403 Lincolnshire Road Oklahoma City OK 73159 telephone 1-405/793-9213 RC Aerobatics/Van Putte Continued page 53 nation can deviate normal still able score Hanno makes style rather following hes World Champion STYLE PREFERENCE isnt exactly same what Ive talking about Im talk ing about guy wants see pattern flown particular way other styles will appreciated Everyone like some degree some us very bad about know local judge likes low fast Thats worth extra point maneuver isnt fair either its human nature very difficult counter try let affect score 152 Model Aviation Introducing Invisible SvitchTM Made USA still creeps now no other reason simply looks better looks good scores high HUMAN ERROR recent contest sev eral us watching flight amaz ing hear different opinions quality maneuver would have thought watching different airplanes Yes maybe problem people will detect errorsminor onesthat other people simply will see dont see errors scores will obviously higher folks have reputations being easy judges simply dont see errors Its because arent looking because dont see mistakes training problem really eyesight perception prob lem judges usually score very high upper classes mistakes small er rors also probably affected old buddy Halo Factor think youll agree Paul Verger will have very interesting Nats report Im looking ward reading RC Giant Scale/de Vries Continued page 55 way go found Radio Shack carries torch proper oxygen cylindersso Im back business usual schedule holds next month space will taken over Nats reports Back atcha December issue probably news big IMAA to-do Odessa TX RC Old-Timers/Mathews Continued page 57 lateral area floats So would appear quite accident Dan hit design wellsuited flying off waterbut red hot traditional flying anyone interested twin floats 20 long profile much like full-scale Edo floats bottom steps located planes CG 4i/2 wide supported three wire units attached fuselage bottom cross braces two spots tail float single 8 x 3-in unit having teardrop shape mounted directly below horizontal tail plane Scorpion Major kit withdrawn market Bunch concentrated produc ing engines Later made tethered race cars speedboat kit never again pro duced model airplane kits Hisengines continued mainstay com pany until suicide 1948 Scorpion Major RC-Assist model quote Gerald Murphy Herford TX Bunch Scorpion Major powered ignition O&R 29 flies better should really wanted after watching Eut Tileston fly times contestsa real contender looked like Old-Timer Rubber job engine has character gear legs built using six pieces balsa wheels balsa cores surgical tubing tires turned out about 6 oz overweight smaller batteries some other mods still 3 oz over shows difficult get smaller model down 10 oz/sq ft Continued page 1S7 LANDER INDUST 1005 19TH 5T CT VISA HAVAC MONTANA 59501 406-265-6529 BUILDING BOARD 24x72$5395NtLFRT 24x48$4495NcLFRT CANADIAN ORDERS ADD 25% Build straight spending fortune durable high density 1/2' pin surfate bonded 3/4' laminated warp free base straight true work surtace will last years years J * ***** * ****** * * * ** *** ** *** * * * * * WANDIT * N *Dealers Invited * *wile ysirwarranty *p * * or Dry 1OftCORD~ * * Stick Abrasives p *A KeenMachine gives ecceptional *sandingcontrol excellent finish * * 89Basic Ccl 1 flat Wand 1 *of 6 grits *10395Builder Special mcI 2 tlat hatt *round wand 5 6 grits *12995Deluxe includes 3 flat 2 half p *round wands 2 buff wands *tO 6 grits * *Addilionaf wands Abrasives available *See local hobby shop *WANDITOMFG. I44OS916O *p * P09515183Ddu1flt752sI51pp October 1989 153 L- 1