GREETINGS world aerodynami cally strange MAs publisher Carl Wheeley has once again asked write guest column keep forces conventionality aftmounted-tails bay another month Ill start out following up two un conventional configurations discussed last time wrote column Since new wind-tunnel results have become available show have some great possibilities Free Flight Swept tips revisited wing tip design getting lot attention days highly ta pered tip leading edge sweep s theoretically predicted tips would reduce induced drag increase span efficiency parasite drag penalty winglets produce same theory predicts crescent-shaped wing could theoretically give span efficiencies greater elliptical wing last wrote about tips yet tested Since time NASA has tested swept tips wind tunnel Langley Research Center results tests reported Paul Vigyan worked KC Van Dam Bruce Holmes development design forum Oshkosh August swept sheared tips used straight-tapered wing give improvement ef ficiency about 3 percent over optimized Hoerner tip tips tested formed outer 12% wingspan 3 percent drag reduction may seem like much means difference about 10 seconds five-minute-max flight Indoor models fly 15 minutes 3 percent additional 315 seconds enough make big difference competition Perhaps its worth try particu larly span-limited events Now drag reduction provided simple sheared tip has demonstrated experi mentally NASA planning additional tests see higher span efficiencies theory predicts crescent wings can also realized practice results sheared-wing tests will published upcoming AIAA Ameri can Institute Aeronautics Astronautics Ed paper Another look boxplanes Another configura tion promises very low induced drag biplane wing tips connected together end plates boxplane configuration does have low induced drag parasite drag end fins has always tended reduce ben efit configuration Recently study done Peter Gall Hubert Smith deter small chord tip fin could get before became ineffective induced drag improvement created lost What found constant-chord 64 Model Aviation Free Flight Duration Barnaby Wainfan Don Jenkins electrIc-powered flying wing uses trailing edge-hinged spoiler R dether malization Flying wings have no tails pop up DTing challenge Don slides battery pack along arrow-shaft fuselage adjust CG Info column Hewitt Philips developed Superclimber has 36-in span 56 long Idea get rapid climb followed quick descent small-field flying W Hannan plc Hex-hoop built Bud Overn Santa Ana CA 1965 all-sheet-balsa powered reed-valve 020 Bud says flies well under power glide less spectacular Little fin atop wing provides same effect produced dihedral conventional wing wings chord end fins should about /3 chord wings trail ing edge end fins should trailing edges wings wind-tunnel tests show boxplane optimum end fins should have endurance 48 percent better pure biplane 129 percent better monoplane same span results experiments published August 1987 issue Journal Aircraft Pennyplane fliers take note Electric flying wing Don Jenlrins Indianapo lis IN has experimenting electric flying wing shown two photos model has 36-in span eight-inch chord powered ferrite 020 turning 6-3 prop has five-cell battery pack fuselage carbon-fiber arrow shaft batteries motor held shaft aluminum brackets bracket system allows Don move bat teries back forth easily adjust CG trimming especially nice plank-type flying wing does have elevators el evons tail adjust model has no vertical fins Don re ports flies well has led him several long chases photo shows Don holding model near hayfield goes trim Notice beautiful tall grass cushion shock landing trimming As California flier can tell sagebrush hard desert floor no substitute Small ferrite electric motors Ferrite motors smaller sizes ie 020 035 getting hard find As far know neither Astro Flite nor Leisure Electronics still sells shame since very motors ideal getting electric flying modest-sized sport models will fly goodsized models slow leisurely fashion great weekend fun flying Cobalt motors fine competition heavier expensive ferrite motors have always considered 020 035 fer rite motors electric equivalent reedvalve 020 049 Gas engines arent much good competition everyone has some have lot fun Lets hope Electric manufacturers will bring back small ferrite motors meantime hobby shops have found suit able substitutes limited quantities Dakota comments low-L/D Lift-to drag ratioEd sport models prompted letter Joe Wagner designer Dakota 049 bi plane said part reference radical suggestion end March column Dakota ORIGINAL low-L/D sport Free Flight modeland still flies just well today did 1949 first designed t have three little rascals right now y just like suggest column good climb rather sinky glide neglected mention Dakota last column mainly because appeared seven years born Dakota all-sheetbalsa biplane powered either 020 049 glow engine Back 1947 engine like OK Cub 049 just right present-day 049 would probably too hot RMcM Its cute little model same appealingly ugly way Pug dogs VW Beetles couldnt call beautifulbut have have anyway Plans Dakota still avail able $5 Joe Wagner 135 Waugh Ave New Wilmington PA 16142 Joe also offers plans Sioux Comanche Old-Timers January 1988 65 Flying plank Novice Pennyplane canard Al Beckatrom Its hard get simpler Al developed full-scale man-carrying EPB-1 Plank sailplane back Fifties Gene Larrabee caught Lynne Wainfan launching delta-winged model won North rop Flying Wing contest set contest recoord 1985 DIscolored spot middle wing repair patch midair collisIon 87 meet moves Taft Mile Square Detherinalizers flying wings us fly tailless models faced unique Continued page 157 Home hang ee Flight models closets full model boxes wall place store airplanes Luckily make good decorations scene Wainfans apartment circa 1981 Wainfans hole-in-the-wing DT L effective has found date Drag-paddle DT authors Cyrano-li P-30 R another apaproach problem Paddles work some times Usual result series stalls CG too far forward nothIng happens FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 042 thick pound box Price $1300 includes 4 oz Slick Lube $1200 no lube Slick costs $175 Postpaid us via ups Cal add 6tax SMALL BOX 1/4 lb rubber $450 size Orders up $1500 1/4 lb rubber mdse add $150 ups Ovar $15 add 10% a\1 SEND $1 FAl Model Supply FOR LOG tPOBOX3967TorranceCA 90510 CROCKET HOOKS NOW MADE BY FAI match material color surround ing area Maybe Dr Manns dyes food color ing would work Adding little white glue filler says Paul makes stickier harder sand Its main ingredient believe glass mi croballoons would suggest inhale too much sanding dust have hearing good things month about people getting wives involved modeling Shelly Dittman new hubby Rics hobby Jane Schlosberg has now done third model recent months like hear people sharing good thing Unfortu nately some women get good makes us guys look bad Like Addie Naccaratos huge float biplane just finished Lock heed Museum Hey Lympne fans Richard Riding editor Aeroplane Monthly has new book out called Ultralights Early British Classics incor porates lot material has already ap peared magazine series also has great deal interesting new stuff photo section early engines super 26 selected engines ABC 398cc Walter Micron Nifty planes like Watkinson Dingbat Perman Parasol Carden-Baynes Scud III Angus Aquila Comper autogiro Short Cockle etc grace its pages over 400 photographs scale draw ings data tables covering Golden Age British lightplane history during years tween two world wars book compel ling modelers available 1995 British pounds hardback ask bank international money order amount theyll charge dollars available Patrick Stephens Ltd Denington Estate Wel lingborough Northants NN8 2QD England Highly recommended Understanding propellers can difficult kids classes school often things like carve two opposite-direction blades same blank put camber face blade rear other things like Pennyplane props go upside-down blades get pitch set gives full drag feathered blade trying turn other set zero pitch Adults sometimes quite understand prop works either current fad molding blades side bottle cutting cottage cheese container points out certain misunderstanding spinning propellers tips move through air faster does its hubs Thats way dis tance around circle works Props get thrust way blades angled forward pitch like pitch thread Brits call airserews tip moving faster needs lower angle pitch gets its thrust augmented extra speed turning root end blade near hub just puttering around needs help can get come close what tips develop ing therefore needs much higher angle spect ready-made plastic prop carefully will see Now cut blade cylinder like cottage cheese container normally tilt blade 150 left vertical cylinder 15 0 left molding balsa laminates bot tle gives blade rotated normal fashion will have pitch hub less tip number modelers should know better have found out make blades slanted right guess what happens make perfectly almost normal-looking prop guessed pitch high need low vice-versa will fly model al right performance will suffer Thanks Paul Mellrath Keep blades angled right Pea nuts out snowdrifts Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 FF Duration/Wainfan Continued page 65 problem comes time bring down no stab pop up dethermalize model have tried series gadgets bring down some work some dont Don Ross reports pop-up drag paddle near nose version Cyrano II tailless P-30 December 1986 MAFull-Size Plan No 536 works reasonably well have tried method seems de pendent CG position model CG little too far forward model stable enough drag paddle has very little effect CG further aft drag paddle will pro duce stall bring model down Another method works reasonably well shown photo Don Jenkins Electric wing large spoiler hinged its trailing edge placed well aft wing will often trick use spoilers DT flying wing careful place spoiler should never hinge point forward 50% chord line Forward-mounted spoilers can cause large pitch-down moments can lead serious PRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM PINNE TT-2 75B TT-276-B TT-300-B fl30 1-B RETAIL APPROX SIZE PRICE WT 1-3/4 $1295 0Z 1395 100 OZ 1495 OZ 1695 145 05 1695 18805 1895 16605 1995 2150Z 2195200 05 2395 OZ 2595 OZ 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $3 00 Per Spinner PROP NUT ADAPTORS PART NOSIZE TT-140-A1/4-28 TT-610-A6x 1 0mm ET-710-A7s1Omm TT-516-A .5/16-24 TT-810-A .8s 10mm . TT-825-A .8 x 125mm TT-375-A .3/8-24 TT-125-A 125mm RETAIL APPROX PRICE WT $395 . 061 05 395 . 063 OZ 395 . 082 05 395 . 076 OZ 395 . 0760Z 395 . 075 05 495 . 11705 495 . 1150Z 3 Piece Set Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 536 SOUTH HOUSTON TEXAS 77587 713 943-1867 2-3/4 2-3/4/FAll 3 3/FAIl January 1988 157 THE DIFFERENT FOAM MODEL Lowest Cost Modeling COUGAR 1 Send $100 PEtH latest fine-grain sheet foam developments foam samples FREE foam sources Hard Shell finishes now available Dozens easy build foam airplane plans Peanuts R/C FOAM SCALE MODELS Box 662MA St Croix Falls WI 54024 PART NO TT-175-B TT200-B 2 TT-225-B 4 TT-226-B2-1/4 IFAII TT-250-B 2-1/2 TT-251-82-1/2/FAIl TIRED OF SINGLE CYLINDER VIBRATING ENGINES . HERE IS THE ANSWER Vibration worst enemies RIC modeling larger engine vibration will generated Opposing twin cylinders firing simultaneously reduces vibration half course twins cost manufacture EHS Trading Ltd has brought AFFORDABL TWIN Peoples Republic ot China SMOOTH reliable engine can yours fraction cost single cylinder II also looks fits better airplane cheekcowls radial cowls Just think very very few full scale airplanes using cylinder engine ORDER YOUR TWIN STAR TODAY Airframe valuable Radio will thank tomorrow fly ORDER YOUR TWIN STAR NOW CALL TOLL FREE information contact EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HAWAII STD TIME 10 AM7PM Mon-S AUTHENTIC NASA Flight Suits Pictures Jewelry Pens $300 decal fact sheet mission patch print catalog StarBase Exchange PO Box 580423 Houston TX 77258-0423 Whip Antenna Gives Hidden Performance Gone forever nightmare heli- flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIPANTENNA gives hidden performance Less 7 can mounted project front helicopter inside canopy virtually invisible 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 Patches Decals Jackets Hats A# MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 consequences Don Larsen California Free Flighter learned hard way 020 gaspowered wings modet spoiler DT hinge line 25% chord After launch climbed Out beautifully transitioned well gliding nicely untit dethermalizer popped spoiler came out caused large nose-down moment model exe cuted square outside figure-seven dove ver tically ground Needless say Don has moved spoiler back latest models Don better flying wing builders hobby always serious threat nual Northrop Flying Wing Contest own taitless P-30s have gotten ex treme let fuse burn through wing holddown rubberbands separate wing fuselage wing fuselage attached string wing spins maple-seed fashion fuselage hangs beneath way down type DT works well light weight models also produces some amus ing expressions shock spectators dont know deliberate think witnessing disaster progress Sometimes thermal gods hungry pop-off wing will keep eat ing model learned day trimming P-30s DT actu ated wing fuselage separated properly unfortunately DT fuse burned through rubberbands also burned string holding wing fuselage together fuselage came down rapidly wing continued climb thermal tum bling end-over-end eventually lost sight often get half 005 Taft quote Martyn Cowley thermals play keeps year experience watching P-30 pop-off wing go OOS overhead clear day AFTER wing come off fuselage hanging beneath string always seems happen right after drop flight badly enough put out money contest ast got model back great charms Taft modelers out chasing things very rarely stay lost Another photos shows latest attempt flying wing dethermalizer large chunk wing pivots around axis near trailing edge makes big hole wing al lows air flow over movable piece wing hold back end model down forcing stall model shown photo comes down flat just like conventional model DT disadvantage system large hole wing structural weak spot must careful make structure around strong enough carry loads around hole San Diego Orbiteers Club held its annual contest over Labor Day weekend Taft put great contest good time addition standard AMA events Orbiteers added some new fun classes competition Night P-30 Free Flight becomes truly eerie experi ence can see little green chem light circling silently overhead second fun event terminally hyperac tive Minuteman goal put up maximum number one-minute flights possi ble half-hour Contestants could use AMA-legal model model legal unofficial event being flown contest us too lazy fly treated mass launch kind model imagin able starting gun went off winner 10-year-old Junior flying Pee Wee-30 model Unfortunately prize magnum champagne too young legally drink situation com pounded champagne bottle sitting Taft sun everyone lust after exploded hot bottle contacted cold ice ice bucket last report CD going provide replacement award appropriate 10-year-old Orbiteers Annual first chance fly Pee Wee-30 no doubt mind Orbiteers originated P-30 have done again sod expect Pee Wee-30 become extremely popular models easy build fly event heck lot fun Barnaby Wainfan 2S03 Hardwick St Lakewood CA 90712 FF Old-Timers/Baker Continued page 66 release Herb Wahls excellent Bunch Tiger replica may popular choice Another recently approved scaled design 52-in version Stratostreak Kerswap Interceptor look out Plans show Arden 19 judgment should good B too 23 25 engine can get full-sized print plan Bob Larsh 45 South Whitcomb Ave Indianapolis IN 46241 $485 postpaid ask bet will include list other Old-Timer Nostalgia plans has well list full-sized plans Old-Timer HandLaunched Gliders include Hank Cole 158 Model Aviation TWIN STARI 2OO WITHOuT MuFFLEII 40 CC/24 CU IN
Edition: Model Aviation - 1988/01
Page Numbers: 64, 65, 157, 158
Edition: Model Aviation - 1988/01
Page Numbers: 64, 65, 157, 158
GREETINGS world aerodynami cally strange MAs publisher Carl Wheeley has once again asked write guest column keep forces conventionality aftmounted-tails bay another month Ill start out following up two un conventional configurations discussed last time wrote column Since new wind-tunnel results have become available show have some great possibilities Free Flight Swept tips revisited wing tip design getting lot attention days highly ta pered tip leading edge sweep s theoretically predicted tips would reduce induced drag increase span efficiency parasite drag penalty winglets produce same theory predicts crescent-shaped wing could theoretically give span efficiencies greater elliptical wing last wrote about tips yet tested Since time NASA has tested swept tips wind tunnel Langley Research Center results tests reported Paul Vigyan worked KC Van Dam Bruce Holmes development design forum Oshkosh August swept sheared tips used straight-tapered wing give improvement ef ficiency about 3 percent over optimized Hoerner tip tips tested formed outer 12% wingspan 3 percent drag reduction may seem like much means difference about 10 seconds five-minute-max flight Indoor models fly 15 minutes 3 percent additional 315 seconds enough make big difference competition Perhaps its worth try particu larly span-limited events Now drag reduction provided simple sheared tip has demonstrated experi mentally NASA planning additional tests see higher span efficiencies theory predicts crescent wings can also realized practice results sheared-wing tests will published upcoming AIAA Ameri can Institute Aeronautics Astronautics Ed paper Another look boxplanes Another configura tion promises very low induced drag biplane wing tips connected together end plates boxplane configuration does have low induced drag parasite drag end fins has always tended reduce ben efit configuration Recently study done Peter Gall Hubert Smith deter small chord tip fin could get before became ineffective induced drag improvement created lost What found constant-chord 64 Model Aviation Free Flight Duration Barnaby Wainfan Don Jenkins electrIc-powered flying wing uses trailing edge-hinged spoiler R dether malization Flying wings have no tails pop up DTing challenge Don slides battery pack along arrow-shaft fuselage adjust CG Info column Hewitt Philips developed Superclimber has 36-in span 56 long Idea get rapid climb followed quick descent small-field flying W Hannan plc Hex-hoop built Bud Overn Santa Ana CA 1965 all-sheet-balsa powered reed-valve 020 Bud says flies well under power glide less spectacular Little fin atop wing provides same effect produced dihedral conventional wing wings chord end fins should about /3 chord wings trail ing edge end fins should trailing edges wings wind-tunnel tests show boxplane optimum end fins should have endurance 48 percent better pure biplane 129 percent better monoplane same span results experiments published August 1987 issue Journal Aircraft Pennyplane fliers take note Electric flying wing Don Jenlrins Indianapo lis IN has experimenting electric flying wing shown two photos model has 36-in span eight-inch chord powered ferrite 020 turning 6-3 prop has five-cell battery pack fuselage carbon-fiber arrow shaft batteries motor held shaft aluminum brackets bracket system allows Don move bat teries back forth easily adjust CG trimming especially nice plank-type flying wing does have elevators el evons tail adjust model has no vertical fins Don re ports flies well has led him several long chases photo shows Don holding model near hayfield goes trim Notice beautiful tall grass cushion shock landing trimming As California flier can tell sagebrush hard desert floor no substitute Small ferrite electric motors Ferrite motors smaller sizes ie 020 035 getting hard find As far know neither Astro Flite nor Leisure Electronics still sells shame since very motors ideal getting electric flying modest-sized sport models will fly goodsized models slow leisurely fashion great weekend fun flying Cobalt motors fine competition heavier expensive ferrite motors have always considered 020 035 fer rite motors electric equivalent reedvalve 020 049 Gas engines arent much good competition everyone has some have lot fun Lets hope Electric manufacturers will bring back small ferrite motors meantime hobby shops have found suit able substitutes limited quantities Dakota comments low-L/D Lift-to drag ratioEd sport models prompted letter Joe Wagner designer Dakota 049 bi plane said part reference radical suggestion end March column Dakota ORIGINAL low-L/D sport Free Flight modeland still flies just well today did 1949 first designed t have three little rascals right now y just like suggest column good climb rather sinky glide neglected mention Dakota last column mainly because appeared seven years born Dakota all-sheetbalsa biplane powered either 020 049 glow engine Back 1947 engine like OK Cub 049 just right present-day 049 would probably too hot RMcM Its cute little model same appealingly ugly way Pug dogs VW Beetles couldnt call beautifulbut have have anyway Plans Dakota still avail able $5 Joe Wagner 135 Waugh Ave New Wilmington PA 16142 Joe also offers plans Sioux Comanche Old-Timers January 1988 65 Flying plank Novice Pennyplane canard Al Beckatrom Its hard get simpler Al developed full-scale man-carrying EPB-1 Plank sailplane back Fifties Gene Larrabee caught Lynne Wainfan launching delta-winged model won North rop Flying Wing contest set contest recoord 1985 DIscolored spot middle wing repair patch midair collisIon 87 meet moves Taft Mile Square Detherinalizers flying wings us fly tailless models faced unique Continued page 157 Home hang ee Flight models closets full model boxes wall place store airplanes Luckily make good decorations scene Wainfans apartment circa 1981 Wainfans hole-in-the-wing DT L effective has found date Drag-paddle DT authors Cyrano-li P-30 R another apaproach problem Paddles work some times Usual result series stalls CG too far forward nothIng happens FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 042 thick pound box Price $1300 includes 4 oz Slick Lube $1200 no lube Slick costs $175 Postpaid us via ups Cal add 6tax SMALL BOX 1/4 lb rubber $450 size Orders up $1500 1/4 lb rubber mdse add $150 ups Ovar $15 add 10% a\1 SEND $1 FAl Model Supply FOR LOG tPOBOX3967TorranceCA 90510 CROCKET HOOKS NOW MADE BY FAI match material color surround ing area Maybe Dr Manns dyes food color ing would work Adding little white glue filler says Paul makes stickier harder sand Its main ingredient believe glass mi croballoons would suggest inhale too much sanding dust have hearing good things month about people getting wives involved modeling Shelly Dittman new hubby Rics hobby Jane Schlosberg has now done third model recent months like hear people sharing good thing Unfortu nately some women get good makes us guys look bad Like Addie Naccaratos huge float biplane just finished Lock heed Museum Hey Lympne fans Richard Riding editor Aeroplane Monthly has new book out called Ultralights Early British Classics incor porates lot material has already ap peared magazine series also has great deal interesting new stuff photo section early engines super 26 selected engines ABC 398cc Walter Micron Nifty planes like Watkinson Dingbat Perman Parasol Carden-Baynes Scud III Angus Aquila Comper autogiro Short Cockle etc grace its pages over 400 photographs scale draw ings data tables covering Golden Age British lightplane history during years tween two world wars book compel ling modelers available 1995 British pounds hardback ask bank international money order amount theyll charge dollars available Patrick Stephens Ltd Denington Estate Wel lingborough Northants NN8 2QD England Highly recommended Understanding propellers can difficult kids classes school often things like carve two opposite-direction blades same blank put camber face blade rear other things like Pennyplane props go upside-down blades get pitch set gives full drag feathered blade trying turn other set zero pitch Adults sometimes quite understand prop works either current fad molding blades side bottle cutting cottage cheese container points out certain misunderstanding spinning propellers tips move through air faster does its hubs Thats way dis tance around circle works Props get thrust way blades angled forward pitch like pitch thread Brits call airserews tip moving faster needs lower angle pitch gets its thrust augmented extra speed turning root end blade near hub just puttering around needs help can get come close what tips develop ing therefore needs much higher angle spect ready-made plastic prop carefully will see Now cut blade cylinder like cottage cheese container normally tilt blade 150 left vertical cylinder 15 0 left molding balsa laminates bot tle gives blade rotated normal fashion will have pitch hub less tip number modelers should know better have found out make blades slanted right guess what happens make perfectly almost normal-looking prop guessed pitch high need low vice-versa will fly model al right performance will suffer Thanks Paul Mellrath Keep blades angled right Pea nuts out snowdrifts Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 FF Duration/Wainfan Continued page 65 problem comes time bring down no stab pop up dethermalize model have tried series gadgets bring down some work some dont Don Ross reports pop-up drag paddle near nose version Cyrano II tailless P-30 December 1986 MAFull-Size Plan No 536 works reasonably well have tried method seems de pendent CG position model CG little too far forward model stable enough drag paddle has very little effect CG further aft drag paddle will pro duce stall bring model down Another method works reasonably well shown photo Don Jenkins Electric wing large spoiler hinged its trailing edge placed well aft wing will often trick use spoilers DT flying wing careful place spoiler should never hinge point forward 50% chord line Forward-mounted spoilers can cause large pitch-down moments can lead serious PRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM PINNE TT-2 75B TT-276-B TT-300-B fl30 1-B RETAIL APPROX SIZE PRICE WT 1-3/4 $1295 0Z 1395 100 OZ 1495 OZ 1695 145 05 1695 18805 1895 16605 1995 2150Z 2195200 05 2395 OZ 2595 OZ 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $3 00 Per Spinner PROP NUT ADAPTORS PART NOSIZE TT-140-A1/4-28 TT-610-A6x 1 0mm ET-710-A7s1Omm TT-516-A .5/16-24 TT-810-A .8s 10mm . TT-825-A .8 x 125mm TT-375-A .3/8-24 TT-125-A 125mm RETAIL APPROX PRICE WT $395 . 061 05 395 . 063 OZ 395 . 082 05 395 . 076 OZ 395 . 0760Z 395 . 075 05 495 . 11705 495 . 1150Z 3 Piece Set Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 536 SOUTH HOUSTON TEXAS 77587 713 943-1867 2-3/4 2-3/4/FAll 3 3/FAIl January 1988 157 THE DIFFERENT FOAM MODEL Lowest Cost Modeling COUGAR 1 Send $100 PEtH latest fine-grain sheet foam developments foam samples FREE foam sources Hard Shell finishes now available Dozens easy build foam airplane plans Peanuts R/C FOAM SCALE MODELS Box 662MA St Croix Falls WI 54024 PART NO TT-175-B TT200-B 2 TT-225-B 4 TT-226-B2-1/4 IFAII TT-250-B 2-1/2 TT-251-82-1/2/FAIl TIRED OF SINGLE CYLINDER VIBRATING ENGINES . HERE IS THE ANSWER Vibration worst enemies RIC modeling larger engine vibration will generated Opposing twin cylinders firing simultaneously reduces vibration half course twins cost manufacture EHS Trading Ltd has brought AFFORDABL TWIN Peoples Republic ot China SMOOTH reliable engine can yours fraction cost single cylinder II also looks fits better airplane cheekcowls radial cowls Just think very very few full scale airplanes using cylinder engine ORDER YOUR TWIN STAR TODAY Airframe valuable Radio will thank tomorrow fly ORDER YOUR TWIN STAR NOW CALL TOLL FREE information contact EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HAWAII STD TIME 10 AM7PM Mon-S AUTHENTIC NASA Flight Suits Pictures Jewelry Pens $300 decal fact sheet mission patch print catalog StarBase Exchange PO Box 580423 Houston TX 77258-0423 Whip Antenna Gives Hidden Performance Gone forever nightmare heli- flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIPANTENNA gives hidden performance Less 7 can mounted project front helicopter inside canopy virtually invisible 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 Patches Decals Jackets Hats A# MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 consequences Don Larsen California Free Flighter learned hard way 020 gaspowered wings modet spoiler DT hinge line 25% chord After launch climbed Out beautifully transitioned well gliding nicely untit dethermalizer popped spoiler came out caused large nose-down moment model exe cuted square outside figure-seven dove ver tically ground Needless say Don has moved spoiler back latest models Don better flying wing builders hobby always serious threat nual Northrop Flying Wing Contest own taitless P-30s have gotten ex treme let fuse burn through wing holddown rubberbands separate wing fuselage wing fuselage attached string wing spins maple-seed fashion fuselage hangs beneath way down type DT works well light weight models also produces some amus ing expressions shock spectators dont know deliberate think witnessing disaster progress Sometimes thermal gods hungry pop-off wing will keep eat ing model learned day trimming P-30s DT actu ated wing fuselage separated properly unfortunately DT fuse burned through rubberbands also burned string holding wing fuselage together fuselage came down rapidly wing continued climb thermal tum bling end-over-end eventually lost sight often get half 005 Taft quote Martyn Cowley thermals play keeps year experience watching P-30 pop-off wing go OOS overhead clear day AFTER wing come off fuselage hanging beneath string always seems happen right after drop flight badly enough put out money contest ast got model back great charms Taft modelers out chasing things very rarely stay lost Another photos shows latest attempt flying wing dethermalizer large chunk wing pivots around axis near trailing edge makes big hole wing al lows air flow over movable piece wing hold back end model down forcing stall model shown photo comes down flat just like conventional model DT disadvantage system large hole wing structural weak spot must careful make structure around strong enough carry loads around hole San Diego Orbiteers Club held its annual contest over Labor Day weekend Taft put great contest good time addition standard AMA events Orbiteers added some new fun classes competition Night P-30 Free Flight becomes truly eerie experi ence can see little green chem light circling silently overhead second fun event terminally hyperac tive Minuteman goal put up maximum number one-minute flights possi ble half-hour Contestants could use AMA-legal model model legal unofficial event being flown contest us too lazy fly treated mass launch kind model imagin able starting gun went off winner 10-year-old Junior flying Pee Wee-30 model Unfortunately prize magnum champagne too young legally drink situation com pounded champagne bottle sitting Taft sun everyone lust after exploded hot bottle contacted cold ice ice bucket last report CD going provide replacement award appropriate 10-year-old Orbiteers Annual first chance fly Pee Wee-30 no doubt mind Orbiteers originated P-30 have done again sod expect Pee Wee-30 become extremely popular models easy build fly event heck lot fun Barnaby Wainfan 2S03 Hardwick St Lakewood CA 90712 FF Old-Timers/Baker Continued page 66 release Herb Wahls excellent Bunch Tiger replica may popular choice Another recently approved scaled design 52-in version Stratostreak Kerswap Interceptor look out Plans show Arden 19 judgment should good B too 23 25 engine can get full-sized print plan Bob Larsh 45 South Whitcomb Ave Indianapolis IN 46241 $485 postpaid ask bet will include list other Old-Timer Nostalgia plans has well list full-sized plans Old-Timer HandLaunched Gliders include Hank Cole 158 Model Aviation TWIN STARI 2OO WITHOuT MuFFLEII 40 CC/24 CU IN
Edition: Model Aviation - 1988/01
Page Numbers: 64, 65, 157, 158
GREETINGS world aerodynami cally strange MAs publisher Carl Wheeley has once again asked write guest column keep forces conventionality aftmounted-tails bay another month Ill start out following up two un conventional configurations discussed last time wrote column Since new wind-tunnel results have become available show have some great possibilities Free Flight Swept tips revisited wing tip design getting lot attention days highly ta pered tip leading edge sweep s theoretically predicted tips would reduce induced drag increase span efficiency parasite drag penalty winglets produce same theory predicts crescent-shaped wing could theoretically give span efficiencies greater elliptical wing last wrote about tips yet tested Since time NASA has tested swept tips wind tunnel Langley Research Center results tests reported Paul Vigyan worked KC Van Dam Bruce Holmes development design forum Oshkosh August swept sheared tips used straight-tapered wing give improvement ef ficiency about 3 percent over optimized Hoerner tip tips tested formed outer 12% wingspan 3 percent drag reduction may seem like much means difference about 10 seconds five-minute-max flight Indoor models fly 15 minutes 3 percent additional 315 seconds enough make big difference competition Perhaps its worth try particu larly span-limited events Now drag reduction provided simple sheared tip has demonstrated experi mentally NASA planning additional tests see higher span efficiencies theory predicts crescent wings can also realized practice results sheared-wing tests will published upcoming AIAA Ameri can Institute Aeronautics Astronautics Ed paper Another look boxplanes Another configura tion promises very low induced drag biplane wing tips connected together end plates boxplane configuration does have low induced drag parasite drag end fins has always tended reduce ben efit configuration Recently study done Peter Gall Hubert Smith deter small chord tip fin could get before became ineffective induced drag improvement created lost What found constant-chord 64 Model Aviation Free Flight Duration Barnaby Wainfan Don Jenkins electrIc-powered flying wing uses trailing edge-hinged spoiler R dether malization Flying wings have no tails pop up DTing challenge Don slides battery pack along arrow-shaft fuselage adjust CG Info column Hewitt Philips developed Superclimber has 36-in span 56 long Idea get rapid climb followed quick descent small-field flying W Hannan plc Hex-hoop built Bud Overn Santa Ana CA 1965 all-sheet-balsa powered reed-valve 020 Bud says flies well under power glide less spectacular Little fin atop wing provides same effect produced dihedral conventional wing wings chord end fins should about /3 chord wings trail ing edge end fins should trailing edges wings wind-tunnel tests show boxplane optimum end fins should have endurance 48 percent better pure biplane 129 percent better monoplane same span results experiments published August 1987 issue Journal Aircraft Pennyplane fliers take note Electric flying wing Don Jenlrins Indianapo lis IN has experimenting electric flying wing shown two photos model has 36-in span eight-inch chord powered ferrite 020 turning 6-3 prop has five-cell battery pack fuselage carbon-fiber arrow shaft batteries motor held shaft aluminum brackets bracket system allows Don move bat teries back forth easily adjust CG trimming especially nice plank-type flying wing does have elevators el evons tail adjust model has no vertical fins Don re ports flies well has led him several long chases photo shows Don holding model near hayfield goes trim Notice beautiful tall grass cushion shock landing trimming As California flier can tell sagebrush hard desert floor no substitute Small ferrite electric motors Ferrite motors smaller sizes ie 020 035 getting hard find As far know neither Astro Flite nor Leisure Electronics still sells shame since very motors ideal getting electric flying modest-sized sport models will fly goodsized models slow leisurely fashion great weekend fun flying Cobalt motors fine competition heavier expensive ferrite motors have always considered 020 035 fer rite motors electric equivalent reedvalve 020 049 Gas engines arent much good competition everyone has some have lot fun Lets hope Electric manufacturers will bring back small ferrite motors meantime hobby shops have found suit able substitutes limited quantities Dakota comments low-L/D Lift-to drag ratioEd sport models prompted letter Joe Wagner designer Dakota 049 bi plane said part reference radical suggestion end March column Dakota ORIGINAL low-L/D sport Free Flight modeland still flies just well today did 1949 first designed t have three little rascals right now y just like suggest column good climb rather sinky glide neglected mention Dakota last column mainly because appeared seven years born Dakota all-sheetbalsa biplane powered either 020 049 glow engine Back 1947 engine like OK Cub 049 just right present-day 049 would probably too hot RMcM Its cute little model same appealingly ugly way Pug dogs VW Beetles couldnt call beautifulbut have have anyway Plans Dakota still avail able $5 Joe Wagner 135 Waugh Ave New Wilmington PA 16142 Joe also offers plans Sioux Comanche Old-Timers January 1988 65 Flying plank Novice Pennyplane canard Al Beckatrom Its hard get simpler Al developed full-scale man-carrying EPB-1 Plank sailplane back Fifties Gene Larrabee caught Lynne Wainfan launching delta-winged model won North rop Flying Wing contest set contest recoord 1985 DIscolored spot middle wing repair patch midair collisIon 87 meet moves Taft Mile Square Detherinalizers flying wings us fly tailless models faced unique Continued page 157 Home hang ee Flight models closets full model boxes wall place store airplanes Luckily make good decorations scene Wainfans apartment circa 1981 Wainfans hole-in-the-wing DT L effective has found date Drag-paddle DT authors Cyrano-li P-30 R another apaproach problem Paddles work some times Usual result series stalls CG too far forward nothIng happens FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 042 thick pound box Price $1300 includes 4 oz Slick Lube $1200 no lube Slick costs $175 Postpaid us via ups Cal add 6tax SMALL BOX 1/4 lb rubber $450 size Orders up $1500 1/4 lb rubber mdse add $150 ups Ovar $15 add 10% a\1 SEND $1 FAl Model Supply FOR LOG tPOBOX3967TorranceCA 90510 CROCKET HOOKS NOW MADE BY FAI match material color surround ing area Maybe Dr Manns dyes food color ing would work Adding little white glue filler says Paul makes stickier harder sand Its main ingredient believe glass mi croballoons would suggest inhale too much sanding dust have hearing good things month about people getting wives involved modeling Shelly Dittman new hubby Rics hobby Jane Schlosberg has now done third model recent months like hear people sharing good thing Unfortu nately some women get good makes us guys look bad Like Addie Naccaratos huge float biplane just finished Lock heed Museum Hey Lympne fans Richard Riding editor Aeroplane Monthly has new book out called Ultralights Early British Classics incor porates lot material has already ap peared magazine series also has great deal interesting new stuff photo section early engines super 26 selected engines ABC 398cc Walter Micron Nifty planes like Watkinson Dingbat Perman Parasol Carden-Baynes Scud III Angus Aquila Comper autogiro Short Cockle etc grace its pages over 400 photographs scale draw ings data tables covering Golden Age British lightplane history during years tween two world wars book compel ling modelers available 1995 British pounds hardback ask bank international money order amount theyll charge dollars available Patrick Stephens Ltd Denington Estate Wel lingborough Northants NN8 2QD England Highly recommended Understanding propellers can difficult kids classes school often things like carve two opposite-direction blades same blank put camber face blade rear other things like Pennyplane props go upside-down blades get pitch set gives full drag feathered blade trying turn other set zero pitch Adults sometimes quite understand prop works either current fad molding blades side bottle cutting cottage cheese container points out certain misunderstanding spinning propellers tips move through air faster does its hubs Thats way dis tance around circle works Props get thrust way blades angled forward pitch like pitch thread Brits call airserews tip moving faster needs lower angle pitch gets its thrust augmented extra speed turning root end blade near hub just puttering around needs help can get come close what tips develop ing therefore needs much higher angle spect ready-made plastic prop carefully will see Now cut blade cylinder like cottage cheese container normally tilt blade 150 left vertical cylinder 15 0 left molding balsa laminates bot tle gives blade rotated normal fashion will have pitch hub less tip number modelers should know better have found out make blades slanted right guess what happens make perfectly almost normal-looking prop guessed pitch high need low vice-versa will fly model al right performance will suffer Thanks Paul Mellrath Keep blades angled right Pea nuts out snowdrifts Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 FF Duration/Wainfan Continued page 65 problem comes time bring down no stab pop up dethermalize model have tried series gadgets bring down some work some dont Don Ross reports pop-up drag paddle near nose version Cyrano II tailless P-30 December 1986 MAFull-Size Plan No 536 works reasonably well have tried method seems de pendent CG position model CG little too far forward model stable enough drag paddle has very little effect CG further aft drag paddle will pro duce stall bring model down Another method works reasonably well shown photo Don Jenkins Electric wing large spoiler hinged its trailing edge placed well aft wing will often trick use spoilers DT flying wing careful place spoiler should never hinge point forward 50% chord line Forward-mounted spoilers can cause large pitch-down moments can lead serious PRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM PINNE TT-2 75B TT-276-B TT-300-B fl30 1-B RETAIL APPROX SIZE PRICE WT 1-3/4 $1295 0Z 1395 100 OZ 1495 OZ 1695 145 05 1695 18805 1895 16605 1995 2150Z 2195200 05 2395 OZ 2595 OZ 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $3 00 Per Spinner PROP NUT ADAPTORS PART NOSIZE TT-140-A1/4-28 TT-610-A6x 1 0mm ET-710-A7s1Omm TT-516-A .5/16-24 TT-810-A .8s 10mm . TT-825-A .8 x 125mm TT-375-A .3/8-24 TT-125-A 125mm RETAIL APPROX PRICE WT $395 . 061 05 395 . 063 OZ 395 . 082 05 395 . 076 OZ 395 . 0760Z 395 . 075 05 495 . 11705 495 . 1150Z 3 Piece Set Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 536 SOUTH HOUSTON TEXAS 77587 713 943-1867 2-3/4 2-3/4/FAll 3 3/FAIl January 1988 157 THE DIFFERENT FOAM MODEL Lowest Cost Modeling COUGAR 1 Send $100 PEtH latest fine-grain sheet foam developments foam samples FREE foam sources Hard Shell finishes now available Dozens easy build foam airplane plans Peanuts R/C FOAM SCALE MODELS Box 662MA St Croix Falls WI 54024 PART NO TT-175-B TT200-B 2 TT-225-B 4 TT-226-B2-1/4 IFAII TT-250-B 2-1/2 TT-251-82-1/2/FAIl TIRED OF SINGLE CYLINDER VIBRATING ENGINES . HERE IS THE ANSWER Vibration worst enemies RIC modeling larger engine vibration will generated Opposing twin cylinders firing simultaneously reduces vibration half course twins cost manufacture EHS Trading Ltd has brought AFFORDABL TWIN Peoples Republic ot China SMOOTH reliable engine can yours fraction cost single cylinder II also looks fits better airplane cheekcowls radial cowls Just think very very few full scale airplanes using cylinder engine ORDER YOUR TWIN STAR TODAY Airframe valuable Radio will thank tomorrow fly ORDER YOUR TWIN STAR NOW CALL TOLL FREE information contact EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HAWAII STD TIME 10 AM7PM Mon-S AUTHENTIC NASA Flight Suits Pictures Jewelry Pens $300 decal fact sheet mission patch print catalog StarBase Exchange PO Box 580423 Houston TX 77258-0423 Whip Antenna Gives Hidden Performance Gone forever nightmare heli- flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIPANTENNA gives hidden performance Less 7 can mounted project front helicopter inside canopy virtually invisible 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 Patches Decals Jackets Hats A# MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 consequences Don Larsen California Free Flighter learned hard way 020 gaspowered wings modet spoiler DT hinge line 25% chord After launch climbed Out beautifully transitioned well gliding nicely untit dethermalizer popped spoiler came out caused large nose-down moment model exe cuted square outside figure-seven dove ver tically ground Needless say Don has moved spoiler back latest models Don better flying wing builders hobby always serious threat nual Northrop Flying Wing Contest own taitless P-30s have gotten ex treme let fuse burn through wing holddown rubberbands separate wing fuselage wing fuselage attached string wing spins maple-seed fashion fuselage hangs beneath way down type DT works well light weight models also produces some amus ing expressions shock spectators dont know deliberate think witnessing disaster progress Sometimes thermal gods hungry pop-off wing will keep eat ing model learned day trimming P-30s DT actu ated wing fuselage separated properly unfortunately DT fuse burned through rubberbands also burned string holding wing fuselage together fuselage came down rapidly wing continued climb thermal tum bling end-over-end eventually lost sight often get half 005 Taft quote Martyn Cowley thermals play keeps year experience watching P-30 pop-off wing go OOS overhead clear day AFTER wing come off fuselage hanging beneath string always seems happen right after drop flight badly enough put out money contest ast got model back great charms Taft modelers out chasing things very rarely stay lost Another photos shows latest attempt flying wing dethermalizer large chunk wing pivots around axis near trailing edge makes big hole wing al lows air flow over movable piece wing hold back end model down forcing stall model shown photo comes down flat just like conventional model DT disadvantage system large hole wing structural weak spot must careful make structure around strong enough carry loads around hole San Diego Orbiteers Club held its annual contest over Labor Day weekend Taft put great contest good time addition standard AMA events Orbiteers added some new fun classes competition Night P-30 Free Flight becomes truly eerie experi ence can see little green chem light circling silently overhead second fun event terminally hyperac tive Minuteman goal put up maximum number one-minute flights possi ble half-hour Contestants could use AMA-legal model model legal unofficial event being flown contest us too lazy fly treated mass launch kind model imagin able starting gun went off winner 10-year-old Junior flying Pee Wee-30 model Unfortunately prize magnum champagne too young legally drink situation com pounded champagne bottle sitting Taft sun everyone lust after exploded hot bottle contacted cold ice ice bucket last report CD going provide replacement award appropriate 10-year-old Orbiteers Annual first chance fly Pee Wee-30 no doubt mind Orbiteers originated P-30 have done again sod expect Pee Wee-30 become extremely popular models easy build fly event heck lot fun Barnaby Wainfan 2S03 Hardwick St Lakewood CA 90712 FF Old-Timers/Baker Continued page 66 release Herb Wahls excellent Bunch Tiger replica may popular choice Another recently approved scaled design 52-in version Stratostreak Kerswap Interceptor look out Plans show Arden 19 judgment should good B too 23 25 engine can get full-sized print plan Bob Larsh 45 South Whitcomb Ave Indianapolis IN 46241 $485 postpaid ask bet will include list other Old-Timer Nostalgia plans has well list full-sized plans Old-Timer HandLaunched Gliders include Hank Cole 158 Model Aviation TWIN STARI 2OO WITHOuT MuFFLEII 40 CC/24 CU IN
Edition: Model Aviation - 1988/01
Page Numbers: 64, 65, 157, 158
GREETINGS world aerodynami cally strange MAs publisher Carl Wheeley has once again asked write guest column keep forces conventionality aftmounted-tails bay another month Ill start out following up two un conventional configurations discussed last time wrote column Since new wind-tunnel results have become available show have some great possibilities Free Flight Swept tips revisited wing tip design getting lot attention days highly ta pered tip leading edge sweep s theoretically predicted tips would reduce induced drag increase span efficiency parasite drag penalty winglets produce same theory predicts crescent-shaped wing could theoretically give span efficiencies greater elliptical wing last wrote about tips yet tested Since time NASA has tested swept tips wind tunnel Langley Research Center results tests reported Paul Vigyan worked KC Van Dam Bruce Holmes development design forum Oshkosh August swept sheared tips used straight-tapered wing give improvement ef ficiency about 3 percent over optimized Hoerner tip tips tested formed outer 12% wingspan 3 percent drag reduction may seem like much means difference about 10 seconds five-minute-max flight Indoor models fly 15 minutes 3 percent additional 315 seconds enough make big difference competition Perhaps its worth try particu larly span-limited events Now drag reduction provided simple sheared tip has demonstrated experi mentally NASA planning additional tests see higher span efficiencies theory predicts crescent wings can also realized practice results sheared-wing tests will published upcoming AIAA Ameri can Institute Aeronautics Astronautics Ed paper Another look boxplanes Another configura tion promises very low induced drag biplane wing tips connected together end plates boxplane configuration does have low induced drag parasite drag end fins has always tended reduce ben efit configuration Recently study done Peter Gall Hubert Smith deter small chord tip fin could get before became ineffective induced drag improvement created lost What found constant-chord 64 Model Aviation Free Flight Duration Barnaby Wainfan Don Jenkins electrIc-powered flying wing uses trailing edge-hinged spoiler R dether malization Flying wings have no tails pop up DTing challenge Don slides battery pack along arrow-shaft fuselage adjust CG Info column Hewitt Philips developed Superclimber has 36-in span 56 long Idea get rapid climb followed quick descent small-field flying W Hannan plc Hex-hoop built Bud Overn Santa Ana CA 1965 all-sheet-balsa powered reed-valve 020 Bud says flies well under power glide less spectacular Little fin atop wing provides same effect produced dihedral conventional wing wings chord end fins should about /3 chord wings trail ing edge end fins should trailing edges wings wind-tunnel tests show boxplane optimum end fins should have endurance 48 percent better pure biplane 129 percent better monoplane same span results experiments published August 1987 issue Journal Aircraft Pennyplane fliers take note Electric flying wing Don Jenlrins Indianapo lis IN has experimenting electric flying wing shown two photos model has 36-in span eight-inch chord powered ferrite 020 turning 6-3 prop has five-cell battery pack fuselage carbon-fiber arrow shaft batteries motor held shaft aluminum brackets bracket system allows Don move bat teries back forth easily adjust CG trimming especially nice plank-type flying wing does have elevators el evons tail adjust model has no vertical fins Don re ports flies well has led him several long chases photo shows Don holding model near hayfield goes trim Notice beautiful tall grass cushion shock landing trimming As California flier can tell sagebrush hard desert floor no substitute Small ferrite electric motors Ferrite motors smaller sizes ie 020 035 getting hard find As far know neither Astro Flite nor Leisure Electronics still sells shame since very motors ideal getting electric flying modest-sized sport models will fly goodsized models slow leisurely fashion great weekend fun flying Cobalt motors fine competition heavier expensive ferrite motors have always considered 020 035 fer rite motors electric equivalent reedvalve 020 049 Gas engines arent much good competition everyone has some have lot fun Lets hope Electric manufacturers will bring back small ferrite motors meantime hobby shops have found suit able substitutes limited quantities Dakota comments low-L/D Lift-to drag ratioEd sport models prompted letter Joe Wagner designer Dakota 049 bi plane said part reference radical suggestion end March column Dakota ORIGINAL low-L/D sport Free Flight modeland still flies just well today did 1949 first designed t have three little rascals right now y just like suggest column good climb rather sinky glide neglected mention Dakota last column mainly because appeared seven years born Dakota all-sheetbalsa biplane powered either 020 049 glow engine Back 1947 engine like OK Cub 049 just right present-day 049 would probably too hot RMcM Its cute little model same appealingly ugly way Pug dogs VW Beetles couldnt call beautifulbut have have anyway Plans Dakota still avail able $5 Joe Wagner 135 Waugh Ave New Wilmington PA 16142 Joe also offers plans Sioux Comanche Old-Timers January 1988 65 Flying plank Novice Pennyplane canard Al Beckatrom Its hard get simpler Al developed full-scale man-carrying EPB-1 Plank sailplane back Fifties Gene Larrabee caught Lynne Wainfan launching delta-winged model won North rop Flying Wing contest set contest recoord 1985 DIscolored spot middle wing repair patch midair collisIon 87 meet moves Taft Mile Square Detherinalizers flying wings us fly tailless models faced unique Continued page 157 Home hang ee Flight models closets full model boxes wall place store airplanes Luckily make good decorations scene Wainfans apartment circa 1981 Wainfans hole-in-the-wing DT L effective has found date Drag-paddle DT authors Cyrano-li P-30 R another apaproach problem Paddles work some times Usual result series stalls CG too far forward nothIng happens FAI RUBBER Sizes 1/4 3/16 1/8 3/32 1/16 042 thick pound box Price $1300 includes 4 oz Slick Lube $1200 no lube Slick costs $175 Postpaid us via ups Cal add 6tax SMALL BOX 1/4 lb rubber $450 size Orders up $1500 1/4 lb rubber mdse add $150 ups Ovar $15 add 10% a\1 SEND $1 FAl Model Supply FOR LOG tPOBOX3967TorranceCA 90510 CROCKET HOOKS NOW MADE BY FAI match material color surround ing area Maybe Dr Manns dyes food color ing would work Adding little white glue filler says Paul makes stickier harder sand Its main ingredient believe glass mi croballoons would suggest inhale too much sanding dust have hearing good things month about people getting wives involved modeling Shelly Dittman new hubby Rics hobby Jane Schlosberg has now done third model recent months like hear people sharing good thing Unfortu nately some women get good makes us guys look bad Like Addie Naccaratos huge float biplane just finished Lock heed Museum Hey Lympne fans Richard Riding editor Aeroplane Monthly has new book out called Ultralights Early British Classics incor porates lot material has already ap peared magazine series also has great deal interesting new stuff photo section early engines super 26 selected engines ABC 398cc Walter Micron Nifty planes like Watkinson Dingbat Perman Parasol Carden-Baynes Scud III Angus Aquila Comper autogiro Short Cockle etc grace its pages over 400 photographs scale draw ings data tables covering Golden Age British lightplane history during years tween two world wars book compel ling modelers available 1995 British pounds hardback ask bank international money order amount theyll charge dollars available Patrick Stephens Ltd Denington Estate Wel lingborough Northants NN8 2QD England Highly recommended Understanding propellers can difficult kids classes school often things like carve two opposite-direction blades same blank put camber face blade rear other things like Pennyplane props go upside-down blades get pitch set gives full drag feathered blade trying turn other set zero pitch Adults sometimes quite understand prop works either current fad molding blades side bottle cutting cottage cheese container points out certain misunderstanding spinning propellers tips move through air faster does its hubs Thats way dis tance around circle works Props get thrust way blades angled forward pitch like pitch thread Brits call airserews tip moving faster needs lower angle pitch gets its thrust augmented extra speed turning root end blade near hub just puttering around needs help can get come close what tips develop ing therefore needs much higher angle spect ready-made plastic prop carefully will see Now cut blade cylinder like cottage cheese container normally tilt blade 150 left vertical cylinder 15 0 left molding balsa laminates bot tle gives blade rotated normal fashion will have pitch hub less tip number modelers should know better have found out make blades slanted right guess what happens make perfectly almost normal-looking prop guessed pitch high need low vice-versa will fly model al right performance will suffer Thanks Paul Mellrath Keep blades angled right Pea nuts out snowdrifts Bill Warner 423-C San Vicente Blvd Santa Monica CA 90402 FF Duration/Wainfan Continued page 65 problem comes time bring down no stab pop up dethermalize model have tried series gadgets bring down some work some dont Don Ross reports pop-up drag paddle near nose version Cyrano II tailless P-30 December 1986 MAFull-Size Plan No 536 works reasonably well have tried method seems de pendent CG position model CG little too far forward model stable enough drag paddle has very little effect CG further aft drag paddle will pro duce stall bring model down Another method works reasonably well shown photo Don Jenkins Electric wing large spoiler hinged its trailing edge placed well aft wing will often trick use spoilers DT flying wing careful place spoiler should never hinge point forward 50% chord line Forward-mounted spoilers can cause large pitch-down moments can lead serious PRECISION MODEL PRODUCTS Made USA BARSTOCK ALUMINUM PINNE TT-2 75B TT-276-B TT-300-B fl30 1-B RETAIL APPROX SIZE PRICE WT 1-3/4 $1295 0Z 1395 100 OZ 1495 OZ 1695 145 05 1695 18805 1895 16605 1995 2150Z 2195200 05 2395 OZ 2595 OZ 3 Pieces Cone Back Plate Retainer Screw Note 3 4 Blade Spinners Available Sizes Add $3 00 Per Spinner PROP NUT ADAPTORS PART NOSIZE TT-140-A1/4-28 TT-610-A6x 1 0mm ET-710-A7s1Omm TT-516-A .5/16-24 TT-810-A .8s 10mm . TT-825-A .8 x 125mm TT-375-A .3/8-24 TT-125-A 125mm RETAIL APPROX PRICE WT $395 . 061 05 395 . 063 OZ 395 . 082 05 395 . 076 OZ 395 . 0760Z 395 . 075 05 495 . 11705 495 . 1150Z 3 Piece Set Nut Washer Machined Bushing Add $350 Shipping Handling Prices subject change notice ROMCO MFG INC OX 536 SOUTH HOUSTON TEXAS 77587 713 943-1867 2-3/4 2-3/4/FAll 3 3/FAIl January 1988 157 THE DIFFERENT FOAM MODEL Lowest Cost Modeling COUGAR 1 Send $100 PEtH latest fine-grain sheet foam developments foam samples FREE foam sources Hard Shell finishes now available Dozens easy build foam airplane plans Peanuts R/C FOAM SCALE MODELS Box 662MA St Croix Falls WI 54024 PART NO TT-175-B TT200-B 2 TT-225-B 4 TT-226-B2-1/4 IFAII TT-250-B 2-1/2 TT-251-82-1/2/FAIl TIRED OF SINGLE CYLINDER VIBRATING ENGINES . HERE IS THE ANSWER Vibration worst enemies RIC modeling larger engine vibration will generated Opposing twin cylinders firing simultaneously reduces vibration half course twins cost manufacture EHS Trading Ltd has brought AFFORDABL TWIN Peoples Republic ot China SMOOTH reliable engine can yours fraction cost single cylinder II also looks fits better airplane cheekcowls radial cowls Just think very very few full scale airplanes using cylinder engine ORDER YOUR TWIN STAR TODAY Airframe valuable Radio will thank tomorrow fly ORDER YOUR TWIN STAR NOW CALL TOLL FREE information contact EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HAWAII STD TIME 10 AM7PM Mon-S AUTHENTIC NASA Flight Suits Pictures Jewelry Pens $300 decal fact sheet mission patch print catalog StarBase Exchange PO Box 580423 Houston TX 77258-0423 Whip Antenna Gives Hidden Performance Gone forever nightmare heli- flier dreads stepping 3 foot tenna ripping off front prized chopper just its ready fly Base loaded short WHIPANTENNA gives hidden performance Less 7 can mounted project front helicopter inside canopy virtually invisible 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 Patches Decals Jackets Hats A# MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 consequences Don Larsen California Free Flighter learned hard way 020 gaspowered wings modet spoiler DT hinge line 25% chord After launch climbed Out beautifully transitioned well gliding nicely untit dethermalizer popped spoiler came out caused large nose-down moment model exe cuted square outside figure-seven dove ver tically ground Needless say Don has moved spoiler back latest models Don better flying wing builders hobby always serious threat nual Northrop Flying Wing Contest own taitless P-30s have gotten ex treme let fuse burn through wing holddown rubberbands separate wing fuselage wing fuselage attached string wing spins maple-seed fashion fuselage hangs beneath way down type DT works well light weight models also produces some amus ing expressions shock spectators dont know deliberate think witnessing disaster progress Sometimes thermal gods hungry pop-off wing will keep eat ing model learned day trimming P-30s DT actu ated wing fuselage separated properly unfortunately DT fuse burned through rubberbands also burned string holding wing fuselage together fuselage came down rapidly wing continued climb thermal tum bling end-over-end eventually lost sight often get half 005 Taft quote Martyn Cowley thermals play keeps year experience watching P-30 pop-off wing go OOS overhead clear day AFTER wing come off fuselage hanging beneath string always seems happen right after drop flight badly enough put out money contest ast got model back great charms Taft modelers out chasing things very rarely stay lost Another photos shows latest attempt flying wing dethermalizer large chunk wing pivots around axis near trailing edge makes big hole wing al lows air flow over movable piece wing hold back end model down forcing stall model shown photo comes down flat just like conventional model DT disadvantage system large hole wing structural weak spot must careful make structure around strong enough carry loads around hole San Diego Orbiteers Club held its annual contest over Labor Day weekend Taft put great contest good time addition standard AMA events Orbiteers added some new fun classes competition Night P-30 Free Flight becomes truly eerie experi ence can see little green chem light circling silently overhead second fun event terminally hyperac tive Minuteman goal put up maximum number one-minute flights possi ble half-hour Contestants could use AMA-legal model model legal unofficial event being flown contest us too lazy fly treated mass launch kind model imagin able starting gun went off winner 10-year-old Junior flying Pee Wee-30 model Unfortunately prize magnum champagne too young legally drink situation com pounded champagne bottle sitting Taft sun everyone lust after exploded hot bottle contacted cold ice ice bucket last report CD going provide replacement award appropriate 10-year-old Orbiteers Annual first chance fly Pee Wee-30 no doubt mind Orbiteers originated P-30 have done again sod expect Pee Wee-30 become extremely popular models easy build fly event heck lot fun Barnaby Wainfan 2S03 Hardwick St Lakewood CA 90712 FF Old-Timers/Baker Continued page 66 release Herb Wahls excellent Bunch Tiger replica may popular choice Another recently approved scaled design 52-in version Stratostreak Kerswap Interceptor look out Plans show Arden 19 judgment should good B too 23 25 engine can get full-sized print plan Bob Larsh 45 South Whitcomb Ave Indianapolis IN 46241 $485 postpaid ask bet will include list other Old-Timer Nostalgia plans has well list full-sized plans Old-Timer HandLaunched Gliders include Hank Cole 158 Model Aviation TWIN STARI 2OO WITHOuT MuFFLEII 40 CC/24 CU IN
