FREE FLIGHT INDOOR APOLOGY couple columns back got careless Bob Meuser gave proper dressing-down Dear Bud Re column May 1996 issue Mod Aviation first paragraph say . Easy B wings may have form bracing ts funny thought FAI Indoor wings could braced Gotcha imagine meant . wings Easy B models may braced tail surfaces motor stick etc . whatever Bud replies Right Regarding Question Bob Eberle Im sure understand question guess means blade angle might deviate what intended point measurement ultra-simplistic disgustingly superficial answer dont know dug up Bob paraphrased comment made during phone conversations doesnt quite hack Perhaps what meant say something along lines Measuring blaSe angle certain radius will tell pitch radius might representative prop whole especially blades alike prop does have uniform pitch can get complete picture measuring blade angle several radii blade pitch uniform saying has certain pitch doesnt tell whole story anyhow Usually nominal pitch measured arbitrary radius about 7/10 tip radius no standard nor single effective radius applicable pitch distributions blade shapes Also doesnt make much sense present formula telling what symbols mean formula applies As stands formula presented P D meaningless Like said got careless Sorry about P course pitch D might taken diameter corresponding measurement radius would correct unlikely event blade angle 6340 formula correct D means radius case might better name R blade angle 450 generally Pitch pi x radius x tan blade angle radius formula requires also pitch radius same units inches metric blade angle expressed degrees Growing Two columns ago posted suggestion us Internet could share E-mail addresses idea forming quick-reaction network 10 growing send address rten@intexnet Before long Ill circulate list 1966 MiniStick Postal Results following times culled full report released Larry Coslick hosted event aid other editors Indoor News Views Fliers seven countries participated following entrant counts USA 33 Japan 40 France 2 England 3 Canada 3 Sweden 3 Italy 6 Spain 3 total includes some fliers posted two times top five times USA Japan given complete results remaining countries Multiple entries appear below fliers highest time shown CountryTime Ceiling MultiplierScore Flier Ffrst Place International VanGorder Walt Clem Jim Toni Yatabe Vancil Mark Platt Bob Toni Onishi Mzik Larry Frugoli Gene-Francis Collins Walt Shigezoshi Nonaka Kazumasa Kihara Shigezashi Nonald Wilson Roy Alverez Phil Roch Edmond OGrady Dan Tomkvist George Olshefsky Peter Don Steeb Long Don Grange Yannick Tabellini Renzo Pontan Sven Dimes George V DeAngelo Giacomo Hartstrein Daniel Pianigiani Franco Font-Bellot Luis Rodriguez Santiago De Robertis Stefania Spagnoli Maurio Haro-Martinez F Fagnotti Maunzio USA USA JAPAN USA USA JAPAN USA FRANCE USA JAPAN JAPAN JAPAN ENGLAND CANADA FRANCE CANADA SWEDEN CANADA CANADA CANADA FRANCE ITALY SWEDEN ENGLAND ITALY SWEDEN ITALY SPAIN SPAIN ITALY ITALY SPAIN ITALY 538 17916 1733 932598 558 563 424 398 547 473 378 359 470 473 439 438 478 354 483 250 439 403 363 256 279 263 246 259 181 155 127 134 116 102 81 97 23 2952 105 8166 2952 20 822 8166 2592 2952 2592 2807 483 1952 59 78 59 59 483 1952 269 238 193 269 1984 269 133 164 269 269 133 269 1618 1504 1984 2101 1504 1682 2098 2101 1562 1504 1562 1527 1288 1694 1205 2122 1205 1205 1288 1694 1546 1602 1699 1546 1686 1546 1873 1775 1546 1546 1873 1546 902628 846670 841139 836138 822608 795698 792969 754205 734367 711323 685930 668656 615 803 599506 582014 530509 528994 485614 467614 433541 431136 421298 417902 400397 305160 239620 237870 237819 179328 157685 151713 149956 MiniStick Catapult Glider Records Jump Again MimStick Category Time I 923 IV 1134 IV ll36 Catapult Glider Standard Class II 0294 * Kenny Krempetz II 0505 Wayne Triven Catapult Glider UnlImited Class II 0420 Kurt Kremperz II 0507 Wayne Triven FlierDate Walt Van Gorder 4/11/96 Walt Van Gorder 4/15/96 Bob Eberle 4/20/96 Model Design Modified Knish K777 Modified Knish K777 Original Design 4/02/96 Team Design** 4/20/96 Original Design 4/02/96 Original Design 4/20/96 Original Design *Junior Entrant **Fafler/son team Can Learn Results Maybe sosee what think Figure 1 graph seconds/foot altitude selected entries complete results list As compiled chart realized doesnt tell whole story Vein Hackers entry 162 seconds 59-foot site model reached estimated 48 feet computes about 34 seconds/foot Vein can extrapolate easily see needs lower sink rate become truly competitive International Postal So can youget best no-touch secift time can no-touch flight practice flat ceiling see fall curve Site Ingenuity interesting piece taken newsletter Langley Brainbusters edited Abram Van Dover particularly timely us lesson clear can fly places given proper connections and/or arrangements FlashIndoor Flying Back Thanks guys like Hewitt Phillips Lee Person now can fly 30 x 60 wind tunnel big step us now have 90-foot ceiling Check map can September 1996 119 Figure 1 plot time vs ceiling height MiniStick Postal entries see text Bud Tenny sketch Figure 2 Idealized torque curve Tan II parameters identified see text Bud Tenny sketch get site too much fuss dont have NASA militaiy sticker would better off coming NASA gate working way around airfield Hying Opportunities truncated list contains some unverified data gives some advance notice Check everything Always venfy contest date phone before leaving home CaliforniaBurbank Blacksheep Exhibition Squadron has monthly sessions second Fridays Cat Luther Burbank Middle School Tony Naccarato Tel 818 842-5062 CaliforniaGarden Grove Weekly sessions Crystal Cathedral Garden Grove California John Wenk 4621 Silverleaf Ave Orange CA 92669 Tel 714 633-8546 CaliforniaMann County 20 miles north San Francisco Year-round minicontests 8 am-2 pm 4th Sunday month Contact George Benson 204 Benson Circle Mill Valley CA 94941 Tel 415 388-1809 CaliforniaSan Diego Fun Fly Scale sessions monthly Colina Del Sol Community Center Cat 15316 Orange Ave San Diego Howard Haupt 3860 Ecochee Ave San Diego CA 92117 Tel 619 272-5656 CanadaWinnipeg Manitoba Cat land Cat 111 flying sessions Contact Bame Taylor 2 Thackery Winnipeg Manitoba Canada R3K OHl Tel 204 889-4737 ConnecticutNorwich Flying sessions held Saturdays 9 am-l pm 1994-95 Contact John Koptonak 3 Wiemes Ct Waterfonzl CT 06385 Tel 203 442-9003 UlinoisChicago area Year-round weekly sessions held 6-11 pm Monday evenings Bob Warmann 245 N Oaldawn Elmhurst IL 60126 Tel 708 834-9075 IowaCedar Rapids Non-sanctioned Indoor flying Nov 1994 through Feb 1995 Paul Mcllrath 152448 St NE Cedar Rapids IA 52402 Tel 319 393-4677 Kentucky Louisville Flying sessions held regularly Contact Mason Plank 3207 Oriole Dr Louisville KY 40213 Tel 502 634-8191 New JerseyLakehurst 1995 flying sessions/contests/record trials Hangar #1 continue Contact Gary Underwood 24 Kennebec Ct Bordentown NJ 08505 Tel 609 324-9004 North CarolinaCharlotte Flying sessions Friday night year-round Contact Cliff Culpepper 1401 Femdiffe Rd Charlotte NC 28211 Tel 704 366-7350 details OhioCleveland area Weekly sessions yearround Cat sites Contact Vein Hacker 25599 Breckennidge Dr Euclid OH 441171807 Tel 216 486-4990 Flight Trim/Design discussion before added comments what prompted design study Doug McIean mentioned recent column believe Dougs study automatically incorporates consideration fullbore winding Boeing Hawks newsletter edited Gene Stubbs Trinmiing Low Ceilings Conditions Oxbow started interesting discussion go about trimming power say Pennyplane fly under low ceiling having lots structure As see it goes something like climb rate has limited avoid getting tangled up ceiling beams shallow climb airplane can luck bounce off lowest beams keep flying So choose longest motor think will unwind way select rubber width airplane will cruise climb gently during plateau region rubber torque curve stop winding before get power burst region torque curve Bud Tenny comment considerable gain launch tums can gains different winding technique Refer Fig 2 shows complete full-bore windup instead winding near expected max torque C Let motor relax keep length required fit between hooks model Massage re-arrange knots dip fingers Armor dunng nine torque falls stabilizes D Follow winding/unwinding curve note winding launch torque will cause model climb until reaches levelflight torque model will land dead-stick reaches critical torque too little torque keep prop pulling Jim Clem calls remaining part flight lead sled Now consider full-bore windup Point D slowly unwind launch torque B motor now has 19 percent turns predicted flight should have about 12 percent longer duration example assumes neither flight touched top curves closely approximate shape Tan II torque curves under stated conditions apply principle real life must know level flight torque rubber weight used choose rubber loop length weightllength make level flight torque fall near middle flat portion curve 120 Model Aviation 8116 487 U o40010540 -J 179 30 I0 o20 2360 2324 U 20 o25918 @295172 z 0 43111 483 99 59818 102030405060 CEILING HEIGHT Feet c 0 Flight lime- bunch Launch torque B - author found trash can Ace bandage just right mold Pennyplane ribs Bud Tenny photo Electric Power have promised reports Electric Indoor events six different persons past two years know Ive heard Electric motors verge greater importance Indoor thanks Gene Stubbs incredibly competent newsletter Boeing Hawks newsletter Microelectric Motors Don Reich Model Airplane Distributors has discovered source tiny Electric motors presumably same sold Kenway KR-2 unit its powered capacitor since 50 mAh batteries would too heavy motors used silent pagers drive eccentric weight vibrator Don able get couple less $5 made thrust measurements Kenway unit using small props have available different charge voltages capacitor rated 25V little reluctant go highest recommended Kenway charge voltage 42V three fully charged Ni-Cds initial tests motor 2-3V rather disappointing didnt seem have enough thrust fly anything going 42V really pepped up performance fact tore thrust balance sling apart went zinging across workbench After rebuilding balance making some controlled measurements found best prop far familiar 3-inch black nylon Comet prop sold both Kenway HiLine Performance 42V charge approximately follows Initial burst Gradual fade Residual tall THRUST 5-6g 3-4g 1-3g DURATION 5 sec 20sec 2Osec filing down prop thickness removing capacitor jacket got power system weight down 85g thrust 3g lasting almost 30 seconds assuming thrust/weight ratio 14 unit could fly Scale airplane total weight about 12 g leaves 3-4g airframe seems doable light Indoor Peanut Scale airplane especially since fuselage doesnt have support rubber motor Bud Tenny comments possible such tiny capacitor-powered motor could foster free flight event controlled charge capacitor fixed amount energy would serve level playing field can get Indoor duration fixed amount energy Think about winner would have both electronic aerodynamic skills Ribs Boxes previous column showed mold sheet strip ribs Forms matter luck photo shows molded Pennyplane ribson trash can Ace medical bandage holding wood form set over hot tamp dry HER CUT creates new standard ease accuracy cutting white blue foam wing cores ds off Precise single wire tracking concert micro-adjustable balance weights guided exclusive three-point tracking system guarantees ripple-free surfaces No trailing edge burn-out common two wire systems Couple FEATHER CUT Tekoas THERMAL GENERATOR fool proof temperature control youll Pro. first time out Cuts straight taper wings fins stabilizers matically ts tape edge workbench dining table stores its own heavy duty mailing tube lete kit anodized plated components no hardware store trips ructions include cutting first wing making templates old Bow 40 52 Available Power supply required Guaranteed out perform rest Simply bestl 9 TEKOA THE CENTER OF DESIGN 49380 SKYHARBOR WAY FEATHER CUT $14950 S & H THERMAL GENERATOR Power Supply $11950 S & H uPsc~1 IWI DAILY 4338 Austin Blvd Island Park NV11558TeI 516-431-4127Fax 516-889-2682 FEATURING UTEWEIGHT EUT CONDUIT TUBING & QUICK LOCK SUP ON FITTiNGS NO TOOLS [ICWDEW1 I3/41I BxlO$80$110I lOslO$85$115I $5211$180 -C F1cUDE1 I3/4II 8x10$96$130I lOslO$100$136I L222iJ BREAKDOWN MODEL Fits In Cars & Can Shipped UPS Add Amounts Below Unit Price BxIO& 10x10 Flat 440 3/4 & $45 SxlO & lOslO Peaked 436 3/4 & $45 P 10s20 Flat $ 13/4l & $73 1l 10x20 Peaked 3/4-6003/460034-6 603/4-4 003/4-6003/4-6503/4-750 l-8001-800I 900I 5001 800l-9001i000 P4LP40P5FFOOT PAD P03FOLBUNGlE DDQ 3/4-6003/4-6S03/4 7503/4 6503/46003/4-600 l-900 l-90010007501 800l-800 S WOOSHIEm BAILS OUT Release scale-like Parachutisti real crowd pleaser lot funl Brilliant colors Fl orange Fl pink yellow red white blue gold Complete figure & release system $1895 ect plus $385 5/H Model ttViation Special Med White & Blue Red & Gold Combol $1895 325 S/H SEND ORDER TODAY TO HOBBY HUT MANUFACTURING 2020 W 21st St N Suite #77 Wichita KS 67203-21 07 Dept MflV send SASE brochure wE MAMJFACIURE & 5TDcX SEVER AL OTHER SYSTEMS & HAVE FIlL [HE OF ACCESEORIES ALL WITH THE VENDOR 14 MW CALL FAX OR MAt uS TO PLACE YOUR ORDER OR TO RECEIVE YOUR FREF CATALOG September 1996 121 E DUAL$Y POP UP CANOPIES $29900 lOxlO LIGHTWEIGHT $39900 lOxlO HEAVYWEIGHT Sets Up Less 30 Seconc No Tools Required Other Sizes 8x8 10x15 10x20 etsu Inunder60 secon sI No ronas corapsnaaJs1om logoS lettering available no assemblyll 131 RAVENWOCO Ro VERSAILLES KY 40383
Edition: Model Aviation - 1996/09
Page Numbers: 119, 120, 121
Edition: Model Aviation - 1996/09
Page Numbers: 119, 120, 121
FREE FLIGHT INDOOR APOLOGY couple columns back got careless Bob Meuser gave proper dressing-down Dear Bud Re column May 1996 issue Mod Aviation first paragraph say . Easy B wings may have form bracing ts funny thought FAI Indoor wings could braced Gotcha imagine meant . wings Easy B models may braced tail surfaces motor stick etc . whatever Bud replies Right Regarding Question Bob Eberle Im sure understand question guess means blade angle might deviate what intended point measurement ultra-simplistic disgustingly superficial answer dont know dug up Bob paraphrased comment made during phone conversations doesnt quite hack Perhaps what meant say something along lines Measuring blaSe angle certain radius will tell pitch radius might representative prop whole especially blades alike prop does have uniform pitch can get complete picture measuring blade angle several radii blade pitch uniform saying has certain pitch doesnt tell whole story anyhow Usually nominal pitch measured arbitrary radius about 7/10 tip radius no standard nor single effective radius applicable pitch distributions blade shapes Also doesnt make much sense present formula telling what symbols mean formula applies As stands formula presented P D meaningless Like said got careless Sorry about P course pitch D might taken diameter corresponding measurement radius would correct unlikely event blade angle 6340 formula correct D means radius case might better name R blade angle 450 generally Pitch pi x radius x tan blade angle radius formula requires also pitch radius same units inches metric blade angle expressed degrees Growing Two columns ago posted suggestion us Internet could share E-mail addresses idea forming quick-reaction network 10 growing send address rten@intexnet Before long Ill circulate list 1966 MiniStick Postal Results following times culled full report released Larry Coslick hosted event aid other editors Indoor News Views Fliers seven countries participated following entrant counts USA 33 Japan 40 France 2 England 3 Canada 3 Sweden 3 Italy 6 Spain 3 total includes some fliers posted two times top five times USA Japan given complete results remaining countries Multiple entries appear below fliers highest time shown CountryTime Ceiling MultiplierScore Flier Ffrst Place International VanGorder Walt Clem Jim Toni Yatabe Vancil Mark Platt Bob Toni Onishi Mzik Larry Frugoli Gene-Francis Collins Walt Shigezoshi Nonaka Kazumasa Kihara Shigezashi Nonald Wilson Roy Alverez Phil Roch Edmond OGrady Dan Tomkvist George Olshefsky Peter Don Steeb Long Don Grange Yannick Tabellini Renzo Pontan Sven Dimes George V DeAngelo Giacomo Hartstrein Daniel Pianigiani Franco Font-Bellot Luis Rodriguez Santiago De Robertis Stefania Spagnoli Maurio Haro-Martinez F Fagnotti Maunzio USA USA JAPAN USA USA JAPAN USA FRANCE USA JAPAN JAPAN JAPAN ENGLAND CANADA FRANCE CANADA SWEDEN CANADA CANADA CANADA FRANCE ITALY SWEDEN ENGLAND ITALY SWEDEN ITALY SPAIN SPAIN ITALY ITALY SPAIN ITALY 538 17916 1733 932598 558 563 424 398 547 473 378 359 470 473 439 438 478 354 483 250 439 403 363 256 279 263 246 259 181 155 127 134 116 102 81 97 23 2952 105 8166 2952 20 822 8166 2592 2952 2592 2807 483 1952 59 78 59 59 483 1952 269 238 193 269 1984 269 133 164 269 269 133 269 1618 1504 1984 2101 1504 1682 2098 2101 1562 1504 1562 1527 1288 1694 1205 2122 1205 1205 1288 1694 1546 1602 1699 1546 1686 1546 1873 1775 1546 1546 1873 1546 902628 846670 841139 836138 822608 795698 792969 754205 734367 711323 685930 668656 615 803 599506 582014 530509 528994 485614 467614 433541 431136 421298 417902 400397 305160 239620 237870 237819 179328 157685 151713 149956 MiniStick Catapult Glider Records Jump Again MimStick Category Time I 923 IV 1134 IV ll36 Catapult Glider Standard Class II 0294 * Kenny Krempetz II 0505 Wayne Triven Catapult Glider UnlImited Class II 0420 Kurt Kremperz II 0507 Wayne Triven FlierDate Walt Van Gorder 4/11/96 Walt Van Gorder 4/15/96 Bob Eberle 4/20/96 Model Design Modified Knish K777 Modified Knish K777 Original Design 4/02/96 Team Design** 4/20/96 Original Design 4/02/96 Original Design 4/20/96 Original Design *Junior Entrant **Fafler/son team Can Learn Results Maybe sosee what think Figure 1 graph seconds/foot altitude selected entries complete results list As compiled chart realized doesnt tell whole story Vein Hackers entry 162 seconds 59-foot site model reached estimated 48 feet computes about 34 seconds/foot Vein can extrapolate easily see needs lower sink rate become truly competitive International Postal So can youget best no-touch secift time can no-touch flight practice flat ceiling see fall curve Site Ingenuity interesting piece taken newsletter Langley Brainbusters edited Abram Van Dover particularly timely us lesson clear can fly places given proper connections and/or arrangements FlashIndoor Flying Back Thanks guys like Hewitt Phillips Lee Person now can fly 30 x 60 wind tunnel big step us now have 90-foot ceiling Check map can September 1996 119 Figure 1 plot time vs ceiling height MiniStick Postal entries see text Bud Tenny sketch Figure 2 Idealized torque curve Tan II parameters identified see text Bud Tenny sketch get site too much fuss dont have NASA militaiy sticker would better off coming NASA gate working way around airfield Hying Opportunities truncated list contains some unverified data gives some advance notice Check everything Always venfy contest date phone before leaving home CaliforniaBurbank Blacksheep Exhibition Squadron has monthly sessions second Fridays Cat Luther Burbank Middle School Tony Naccarato Tel 818 842-5062 CaliforniaGarden Grove Weekly sessions Crystal Cathedral Garden Grove California John Wenk 4621 Silverleaf Ave Orange CA 92669 Tel 714 633-8546 CaliforniaMann County 20 miles north San Francisco Year-round minicontests 8 am-2 pm 4th Sunday month Contact George Benson 204 Benson Circle Mill Valley CA 94941 Tel 415 388-1809 CaliforniaSan Diego Fun Fly Scale sessions monthly Colina Del Sol Community Center Cat 15316 Orange Ave San Diego Howard Haupt 3860 Ecochee Ave San Diego CA 92117 Tel 619 272-5656 CanadaWinnipeg Manitoba Cat land Cat 111 flying sessions Contact Bame Taylor 2 Thackery Winnipeg Manitoba Canada R3K OHl Tel 204 889-4737 ConnecticutNorwich Flying sessions held Saturdays 9 am-l pm 1994-95 Contact John Koptonak 3 Wiemes Ct Waterfonzl CT 06385 Tel 203 442-9003 UlinoisChicago area Year-round weekly sessions held 6-11 pm Monday evenings Bob Warmann 245 N Oaldawn Elmhurst IL 60126 Tel 708 834-9075 IowaCedar Rapids Non-sanctioned Indoor flying Nov 1994 through Feb 1995 Paul Mcllrath 152448 St NE Cedar Rapids IA 52402 Tel 319 393-4677 Kentucky Louisville Flying sessions held regularly Contact Mason Plank 3207 Oriole Dr Louisville KY 40213 Tel 502 634-8191 New JerseyLakehurst 1995 flying sessions/contests/record trials Hangar #1 continue Contact Gary Underwood 24 Kennebec Ct Bordentown NJ 08505 Tel 609 324-9004 North CarolinaCharlotte Flying sessions Friday night year-round Contact Cliff Culpepper 1401 Femdiffe Rd Charlotte NC 28211 Tel 704 366-7350 details OhioCleveland area Weekly sessions yearround Cat sites Contact Vein Hacker 25599 Breckennidge Dr Euclid OH 441171807 Tel 216 486-4990 Flight Trim/Design discussion before added comments what prompted design study Doug McIean mentioned recent column believe Dougs study automatically incorporates consideration fullbore winding Boeing Hawks newsletter edited Gene Stubbs Trinmiing Low Ceilings Conditions Oxbow started interesting discussion go about trimming power say Pennyplane fly under low ceiling having lots structure As see it goes something like climb rate has limited avoid getting tangled up ceiling beams shallow climb airplane can luck bounce off lowest beams keep flying So choose longest motor think will unwind way select rubber width airplane will cruise climb gently during plateau region rubber torque curve stop winding before get power burst region torque curve Bud Tenny comment considerable gain launch tums can gains different winding technique Refer Fig 2 shows complete full-bore windup instead winding near expected max torque C Let motor relax keep length required fit between hooks model Massage re-arrange knots dip fingers Armor dunng nine torque falls stabilizes D Follow winding/unwinding curve note winding launch torque will cause model climb until reaches levelflight torque model will land dead-stick reaches critical torque too little torque keep prop pulling Jim Clem calls remaining part flight lead sled Now consider full-bore windup Point D slowly unwind launch torque B motor now has 19 percent turns predicted flight should have about 12 percent longer duration example assumes neither flight touched top curves closely approximate shape Tan II torque curves under stated conditions apply principle real life must know level flight torque rubber weight used choose rubber loop length weightllength make level flight torque fall near middle flat portion curve 120 Model Aviation 8116 487 U o40010540 -J 179 30 I0 o20 2360 2324 U 20 o25918 @295172 z 0 43111 483 99 59818 102030405060 CEILING HEIGHT Feet c 0 Flight lime- bunch Launch torque B - author found trash can Ace bandage just right mold Pennyplane ribs Bud Tenny photo Electric Power have promised reports Electric Indoor events six different persons past two years know Ive heard Electric motors verge greater importance Indoor thanks Gene Stubbs incredibly competent newsletter Boeing Hawks newsletter Microelectric Motors Don Reich Model Airplane Distributors has discovered source tiny Electric motors presumably same sold Kenway KR-2 unit its powered capacitor since 50 mAh batteries would too heavy motors used silent pagers drive eccentric weight vibrator Don able get couple less $5 made thrust measurements Kenway unit using small props have available different charge voltages capacitor rated 25V little reluctant go highest recommended Kenway charge voltage 42V three fully charged Ni-Cds initial tests motor 2-3V rather disappointing didnt seem have enough thrust fly anything going 42V really pepped up performance fact tore thrust balance sling apart went zinging across workbench After rebuilding balance making some controlled measurements found best prop far familiar 3-inch black nylon Comet prop sold both Kenway HiLine Performance 42V charge approximately follows Initial burst Gradual fade Residual tall THRUST 5-6g 3-4g 1-3g DURATION 5 sec 20sec 2Osec filing down prop thickness removing capacitor jacket got power system weight down 85g thrust 3g lasting almost 30 seconds assuming thrust/weight ratio 14 unit could fly Scale airplane total weight about 12 g leaves 3-4g airframe seems doable light Indoor Peanut Scale airplane especially since fuselage doesnt have support rubber motor Bud Tenny comments possible such tiny capacitor-powered motor could foster free flight event controlled charge capacitor fixed amount energy would serve level playing field can get Indoor duration fixed amount energy Think about winner would have both electronic aerodynamic skills Ribs Boxes previous column showed mold sheet strip ribs Forms matter luck photo shows molded Pennyplane ribson trash can Ace medical bandage holding wood form set over hot tamp dry HER CUT creates new standard ease accuracy cutting white blue foam wing cores ds off Precise single wire tracking concert micro-adjustable balance weights guided exclusive three-point tracking system guarantees ripple-free surfaces No trailing edge burn-out common two wire systems Couple FEATHER CUT Tekoas THERMAL GENERATOR fool proof temperature control youll Pro. first time out Cuts straight taper wings fins stabilizers matically ts tape edge workbench dining table stores its own heavy duty mailing tube lete kit anodized plated components no hardware store trips ructions include cutting first wing making templates old Bow 40 52 Available Power supply required Guaranteed out perform rest Simply bestl 9 TEKOA THE CENTER OF DESIGN 49380 SKYHARBOR WAY FEATHER CUT $14950 S & H THERMAL GENERATOR Power Supply $11950 S & H uPsc~1 IWI DAILY 4338 Austin Blvd Island Park NV11558TeI 516-431-4127Fax 516-889-2682 FEATURING UTEWEIGHT EUT CONDUIT TUBING & QUICK LOCK SUP ON FITTiNGS NO TOOLS [ICWDEW1 I3/41I BxlO$80$110I lOslO$85$115I $5211$180 -C F1cUDE1 I3/4II 8x10$96$130I lOslO$100$136I L222iJ BREAKDOWN MODEL Fits In Cars & Can Shipped UPS Add Amounts Below Unit Price BxIO& 10x10 Flat 440 3/4 & $45 SxlO & lOslO Peaked 436 3/4 & $45 P 10s20 Flat $ 13/4l & $73 1l 10x20 Peaked 3/4-6003/460034-6 603/4-4 003/4-6003/4-6503/4-750 l-8001-800I 900I 5001 800l-9001i000 P4LP40P5FFOOT PAD P03FOLBUNGlE DDQ 3/4-6003/4-6S03/4 7503/4 6503/46003/4-600 l-900 l-90010007501 800l-800 S WOOSHIEm BAILS OUT Release scale-like Parachutisti real crowd pleaser lot funl Brilliant colors Fl orange Fl pink yellow red white blue gold Complete figure & release system $1895 ect plus $385 5/H Model ttViation Special Med White & Blue Red & Gold Combol $1895 325 S/H SEND ORDER TODAY TO HOBBY HUT MANUFACTURING 2020 W 21st St N Suite #77 Wichita KS 67203-21 07 Dept MflV send SASE brochure wE MAMJFACIURE & 5TDcX SEVER AL OTHER SYSTEMS & HAVE FIlL [HE OF ACCESEORIES ALL WITH THE VENDOR 14 MW CALL FAX OR MAt uS TO PLACE YOUR ORDER OR TO RECEIVE YOUR FREF CATALOG September 1996 121 E DUAL$Y POP UP CANOPIES $29900 lOxlO LIGHTWEIGHT $39900 lOxlO HEAVYWEIGHT Sets Up Less 30 Seconc No Tools Required Other Sizes 8x8 10x15 10x20 etsu Inunder60 secon sI No ronas corapsnaaJs1om logoS lettering available no assemblyll 131 RAVENWOCO Ro VERSAILLES KY 40383
Edition: Model Aviation - 1996/09
Page Numbers: 119, 120, 121
FREE FLIGHT INDOOR APOLOGY couple columns back got careless Bob Meuser gave proper dressing-down Dear Bud Re column May 1996 issue Mod Aviation first paragraph say . Easy B wings may have form bracing ts funny thought FAI Indoor wings could braced Gotcha imagine meant . wings Easy B models may braced tail surfaces motor stick etc . whatever Bud replies Right Regarding Question Bob Eberle Im sure understand question guess means blade angle might deviate what intended point measurement ultra-simplistic disgustingly superficial answer dont know dug up Bob paraphrased comment made during phone conversations doesnt quite hack Perhaps what meant say something along lines Measuring blaSe angle certain radius will tell pitch radius might representative prop whole especially blades alike prop does have uniform pitch can get complete picture measuring blade angle several radii blade pitch uniform saying has certain pitch doesnt tell whole story anyhow Usually nominal pitch measured arbitrary radius about 7/10 tip radius no standard nor single effective radius applicable pitch distributions blade shapes Also doesnt make much sense present formula telling what symbols mean formula applies As stands formula presented P D meaningless Like said got careless Sorry about P course pitch D might taken diameter corresponding measurement radius would correct unlikely event blade angle 6340 formula correct D means radius case might better name R blade angle 450 generally Pitch pi x radius x tan blade angle radius formula requires also pitch radius same units inches metric blade angle expressed degrees Growing Two columns ago posted suggestion us Internet could share E-mail addresses idea forming quick-reaction network 10 growing send address rten@intexnet Before long Ill circulate list 1966 MiniStick Postal Results following times culled full report released Larry Coslick hosted event aid other editors Indoor News Views Fliers seven countries participated following entrant counts USA 33 Japan 40 France 2 England 3 Canada 3 Sweden 3 Italy 6 Spain 3 total includes some fliers posted two times top five times USA Japan given complete results remaining countries Multiple entries appear below fliers highest time shown CountryTime Ceiling MultiplierScore Flier Ffrst Place International VanGorder Walt Clem Jim Toni Yatabe Vancil Mark Platt Bob Toni Onishi Mzik Larry Frugoli Gene-Francis Collins Walt Shigezoshi Nonaka Kazumasa Kihara Shigezashi Nonald Wilson Roy Alverez Phil Roch Edmond OGrady Dan Tomkvist George Olshefsky Peter Don Steeb Long Don Grange Yannick Tabellini Renzo Pontan Sven Dimes George V DeAngelo Giacomo Hartstrein Daniel Pianigiani Franco Font-Bellot Luis Rodriguez Santiago De Robertis Stefania Spagnoli Maurio Haro-Martinez F Fagnotti Maunzio USA USA JAPAN USA USA JAPAN USA FRANCE USA JAPAN JAPAN JAPAN ENGLAND CANADA FRANCE CANADA SWEDEN CANADA CANADA CANADA FRANCE ITALY SWEDEN ENGLAND ITALY SWEDEN ITALY SPAIN SPAIN ITALY ITALY SPAIN ITALY 538 17916 1733 932598 558 563 424 398 547 473 378 359 470 473 439 438 478 354 483 250 439 403 363 256 279 263 246 259 181 155 127 134 116 102 81 97 23 2952 105 8166 2952 20 822 8166 2592 2952 2592 2807 483 1952 59 78 59 59 483 1952 269 238 193 269 1984 269 133 164 269 269 133 269 1618 1504 1984 2101 1504 1682 2098 2101 1562 1504 1562 1527 1288 1694 1205 2122 1205 1205 1288 1694 1546 1602 1699 1546 1686 1546 1873 1775 1546 1546 1873 1546 902628 846670 841139 836138 822608 795698 792969 754205 734367 711323 685930 668656 615 803 599506 582014 530509 528994 485614 467614 433541 431136 421298 417902 400397 305160 239620 237870 237819 179328 157685 151713 149956 MiniStick Catapult Glider Records Jump Again MimStick Category Time I 923 IV 1134 IV ll36 Catapult Glider Standard Class II 0294 * Kenny Krempetz II 0505 Wayne Triven Catapult Glider UnlImited Class II 0420 Kurt Kremperz II 0507 Wayne Triven FlierDate Walt Van Gorder 4/11/96 Walt Van Gorder 4/15/96 Bob Eberle 4/20/96 Model Design Modified Knish K777 Modified Knish K777 Original Design 4/02/96 Team Design** 4/20/96 Original Design 4/02/96 Original Design 4/20/96 Original Design *Junior Entrant **Fafler/son team Can Learn Results Maybe sosee what think Figure 1 graph seconds/foot altitude selected entries complete results list As compiled chart realized doesnt tell whole story Vein Hackers entry 162 seconds 59-foot site model reached estimated 48 feet computes about 34 seconds/foot Vein can extrapolate easily see needs lower sink rate become truly competitive International Postal So can youget best no-touch secift time can no-touch flight practice flat ceiling see fall curve Site Ingenuity interesting piece taken newsletter Langley Brainbusters edited Abram Van Dover particularly timely us lesson clear can fly places given proper connections and/or arrangements FlashIndoor Flying Back Thanks guys like Hewitt Phillips Lee Person now can fly 30 x 60 wind tunnel big step us now have 90-foot ceiling Check map can September 1996 119 Figure 1 plot time vs ceiling height MiniStick Postal entries see text Bud Tenny sketch Figure 2 Idealized torque curve Tan II parameters identified see text Bud Tenny sketch get site too much fuss dont have NASA militaiy sticker would better off coming NASA gate working way around airfield Hying Opportunities truncated list contains some unverified data gives some advance notice Check everything Always venfy contest date phone before leaving home CaliforniaBurbank Blacksheep Exhibition Squadron has monthly sessions second Fridays Cat Luther Burbank Middle School Tony Naccarato Tel 818 842-5062 CaliforniaGarden Grove Weekly sessions Crystal Cathedral Garden Grove California John Wenk 4621 Silverleaf Ave Orange CA 92669 Tel 714 633-8546 CaliforniaMann County 20 miles north San Francisco Year-round minicontests 8 am-2 pm 4th Sunday month Contact George Benson 204 Benson Circle Mill Valley CA 94941 Tel 415 388-1809 CaliforniaSan Diego Fun Fly Scale sessions monthly Colina Del Sol Community Center Cat 15316 Orange Ave San Diego Howard Haupt 3860 Ecochee Ave San Diego CA 92117 Tel 619 272-5656 CanadaWinnipeg Manitoba Cat land Cat 111 flying sessions Contact Bame Taylor 2 Thackery Winnipeg Manitoba Canada R3K OHl Tel 204 889-4737 ConnecticutNorwich Flying sessions held Saturdays 9 am-l pm 1994-95 Contact John Koptonak 3 Wiemes Ct Waterfonzl CT 06385 Tel 203 442-9003 UlinoisChicago area Year-round weekly sessions held 6-11 pm Monday evenings Bob Warmann 245 N Oaldawn Elmhurst IL 60126 Tel 708 834-9075 IowaCedar Rapids Non-sanctioned Indoor flying Nov 1994 through Feb 1995 Paul Mcllrath 152448 St NE Cedar Rapids IA 52402 Tel 319 393-4677 Kentucky Louisville Flying sessions held regularly Contact Mason Plank 3207 Oriole Dr Louisville KY 40213 Tel 502 634-8191 New JerseyLakehurst 1995 flying sessions/contests/record trials Hangar #1 continue Contact Gary Underwood 24 Kennebec Ct Bordentown NJ 08505 Tel 609 324-9004 North CarolinaCharlotte Flying sessions Friday night year-round Contact Cliff Culpepper 1401 Femdiffe Rd Charlotte NC 28211 Tel 704 366-7350 details OhioCleveland area Weekly sessions yearround Cat sites Contact Vein Hacker 25599 Breckennidge Dr Euclid OH 441171807 Tel 216 486-4990 Flight Trim/Design discussion before added comments what prompted design study Doug McIean mentioned recent column believe Dougs study automatically incorporates consideration fullbore winding Boeing Hawks newsletter edited Gene Stubbs Trinmiing Low Ceilings Conditions Oxbow started interesting discussion go about trimming power say Pennyplane fly under low ceiling having lots structure As see it goes something like climb rate has limited avoid getting tangled up ceiling beams shallow climb airplane can luck bounce off lowest beams keep flying So choose longest motor think will unwind way select rubber width airplane will cruise climb gently during plateau region rubber torque curve stop winding before get power burst region torque curve Bud Tenny comment considerable gain launch tums can gains different winding technique Refer Fig 2 shows complete full-bore windup instead winding near expected max torque C Let motor relax keep length required fit between hooks model Massage re-arrange knots dip fingers Armor dunng nine torque falls stabilizes D Follow winding/unwinding curve note winding launch torque will cause model climb until reaches levelflight torque model will land dead-stick reaches critical torque too little torque keep prop pulling Jim Clem calls remaining part flight lead sled Now consider full-bore windup Point D slowly unwind launch torque B motor now has 19 percent turns predicted flight should have about 12 percent longer duration example assumes neither flight touched top curves closely approximate shape Tan II torque curves under stated conditions apply principle real life must know level flight torque rubber weight used choose rubber loop length weightllength make level flight torque fall near middle flat portion curve 120 Model Aviation 8116 487 U o40010540 -J 179 30 I0 o20 2360 2324 U 20 o25918 @295172 z 0 43111 483 99 59818 102030405060 CEILING HEIGHT Feet c 0 Flight lime- bunch Launch torque B - author found trash can Ace bandage just right mold Pennyplane ribs Bud Tenny photo Electric Power have promised reports Electric Indoor events six different persons past two years know Ive heard Electric motors verge greater importance Indoor thanks Gene Stubbs incredibly competent newsletter Boeing Hawks newsletter Microelectric Motors Don Reich Model Airplane Distributors has discovered source tiny Electric motors presumably same sold Kenway KR-2 unit its powered capacitor since 50 mAh batteries would too heavy motors used silent pagers drive eccentric weight vibrator Don able get couple less $5 made thrust measurements Kenway unit using small props have available different charge voltages capacitor rated 25V little reluctant go highest recommended Kenway charge voltage 42V three fully charged Ni-Cds initial tests motor 2-3V rather disappointing didnt seem have enough thrust fly anything going 42V really pepped up performance fact tore thrust balance sling apart went zinging across workbench After rebuilding balance making some controlled measurements found best prop far familiar 3-inch black nylon Comet prop sold both Kenway HiLine Performance 42V charge approximately follows Initial burst Gradual fade Residual tall THRUST 5-6g 3-4g 1-3g DURATION 5 sec 20sec 2Osec filing down prop thickness removing capacitor jacket got power system weight down 85g thrust 3g lasting almost 30 seconds assuming thrust/weight ratio 14 unit could fly Scale airplane total weight about 12 g leaves 3-4g airframe seems doable light Indoor Peanut Scale airplane especially since fuselage doesnt have support rubber motor Bud Tenny comments possible such tiny capacitor-powered motor could foster free flight event controlled charge capacitor fixed amount energy would serve level playing field can get Indoor duration fixed amount energy Think about winner would have both electronic aerodynamic skills Ribs Boxes previous column showed mold sheet strip ribs Forms matter luck photo shows molded Pennyplane ribson trash can Ace medical bandage holding wood form set over hot tamp dry HER CUT creates new standard ease accuracy cutting white blue foam wing cores ds off Precise single wire tracking concert micro-adjustable balance weights guided exclusive three-point tracking system guarantees ripple-free surfaces No trailing edge burn-out common two wire systems Couple FEATHER CUT Tekoas THERMAL GENERATOR fool proof temperature control youll Pro. first time out Cuts straight taper wings fins stabilizers matically ts tape edge workbench dining table stores its own heavy duty mailing tube lete kit anodized plated components no hardware store trips ructions include cutting first wing making templates old Bow 40 52 Available Power supply required Guaranteed out perform rest Simply bestl 9 TEKOA THE CENTER OF DESIGN 49380 SKYHARBOR WAY FEATHER CUT $14950 S & H THERMAL GENERATOR Power Supply $11950 S & H uPsc~1 IWI DAILY 4338 Austin Blvd Island Park NV11558TeI 516-431-4127Fax 516-889-2682 FEATURING UTEWEIGHT EUT CONDUIT TUBING & QUICK LOCK SUP ON FITTiNGS NO TOOLS [ICWDEW1 I3/41I BxlO$80$110I lOslO$85$115I $5211$180 -C F1cUDE1 I3/4II 8x10$96$130I lOslO$100$136I L222iJ BREAKDOWN MODEL Fits In Cars & Can Shipped UPS Add Amounts Below Unit Price BxIO& 10x10 Flat 440 3/4 & $45 SxlO & lOslO Peaked 436 3/4 & $45 P 10s20 Flat $ 13/4l & $73 1l 10x20 Peaked 3/4-6003/460034-6 603/4-4 003/4-6003/4-6503/4-750 l-8001-800I 900I 5001 800l-9001i000 P4LP40P5FFOOT PAD P03FOLBUNGlE DDQ 3/4-6003/4-6S03/4 7503/4 6503/46003/4-600 l-900 l-90010007501 800l-800 S WOOSHIEm BAILS OUT Release scale-like Parachutisti real crowd pleaser lot funl Brilliant colors Fl orange Fl pink yellow red white blue gold Complete figure & release system $1895 ect plus $385 5/H Model ttViation Special Med White & Blue Red & Gold Combol $1895 325 S/H SEND ORDER TODAY TO HOBBY HUT MANUFACTURING 2020 W 21st St N Suite #77 Wichita KS 67203-21 07 Dept MflV send SASE brochure wE MAMJFACIURE & 5TDcX SEVER AL OTHER SYSTEMS & HAVE FIlL [HE OF ACCESEORIES ALL WITH THE VENDOR 14 MW CALL FAX OR MAt uS TO PLACE YOUR ORDER OR TO RECEIVE YOUR FREF CATALOG September 1996 121 E DUAL$Y POP UP CANOPIES $29900 lOxlO LIGHTWEIGHT $39900 lOxlO HEAVYWEIGHT Sets Up Less 30 Seconc No Tools Required Other Sizes 8x8 10x15 10x20 etsu Inunder60 secon sI No ronas corapsnaaJs1om logoS lettering available no assemblyll 131 RAVENWOCO Ro VERSAILLES KY 40383
