Soaring THE RC SAILPLANE World Cham pionships now slated March 28 through April 2 US team Skip Miller Dale Nutter Lemon Payne will South Africa competing against least nine other countries according latest report December CIAM Paris meeting announce ment least ten countries competing encouraging Flying same planes did Labor Day weekend finals Denver US team held practice session No vember 20 21 Tulsoar Club Tulsa Oklahoma sponsored event time read least practice session team will heldDallas January 22 23 keeping score some Tulsa results Six rounds flown Payne won three Miller two Nutter Scores winning round ranged Dan Pruss perfect 3000 three tasks wonPayne achieved twice 2552 best speed 146 seconds Nutter Grand Esprit Payne Legionair did 133 laps best mark distance tasks 12 20-mph winds Miller Aquila best lap average 917 Paynes speed average 1628 seconds high overall average scores incredibly close individual performances well Final averages Payne 26838 Miller 25542 Nutter 24325 still wish show support US team contributions can made Mr John Nielsen FAI Team Finance Chairman 3744 Lake Ave Wilmette IL 60091 Although fund raising raffle over fund still open donors Just Wings Enough interest has gen erated least club hold compe tition flying wingsonly flying wings Soaring Union Los Angeles SULA has enough members interest ed such contest 77 Dave Jones Western Plan Service Model Aviation Jan 1977 pg 86-87 no doubt has fluential various designs plans scale buffs Daves book lets contains three views six flying wings Included Horten II III IV Pioneer II Icarus V Horten series German design first designed 1931 1939 Horten brothers Walter Reimer model IV drawing board Horten IVs aspect ratio 2166 graceful departure other bat-wing types Jones drawings include substructure detail spoiler drag rudder locations era current Pioneer II Icarus V designs three views both enough stand-off scale documentation look ing detail Pioneer write Jim Marske 130 Crestwood Dr Michi gan City IN 46360 continued page 82 Below Tiahrt Mrlik launch weeds during last years famous Great Race Crosscountry racing requires team effort pix attest John Nielsen watches Warren Tiahrt Jeff Mrlik Dave Corven Greater Detroit Soaring Hiking Society Above Jeff Mrlik jumps piIots seat Tiahrt takes over land along course Left Jerry Mrlik launches original design what will eventual winnersome four hours 47 miles later Jeff controls RC Soaring/Pruss continued page 24 Brochures two dollars Icarus hang glider detailed information can obtained Icarus Aircraft 37 S Euclid SuiteS Pasadena CA 91101 Cross Country Dick Beltz pumped informa tion cause hes modest comes informa tion latest club hold crosscountry race Lancaster PA Area Soaring Society LASS held event Milton Hershey School Hershey PA Sept 25 course nearly eight miles school grounds win ner Dick Beltz own design Pokey time 49 minutes Dick uti lized high-start five launches Other finishers Don Goughnour 1 hr 06 mm 7 launches Bob Curry 1 hr 13 mm 7 launches Jerry Zeigenfuse 2 hr 04 mm 9 launches interesting note Beltzs over pace just behind set Mrlik/ Tiahrt Greater Detroit Soaring Hiking Society last July during Great Bicentennial RC Sailplane Race Yet Beltz averaged little over mile half per launch Detroit team over 35/I distance/launch ratio Since Great Race much arm chair flying has done fliers competed also observed also some just read about should remembered San Fernando Valley Silent Flyers got race business started happened two years ago inauguration Desert Dash unheard goal 20 miles SFVSFs have recent ly run third other two set up run downwind Now planes compete races downwind direction flight necessarily cut out crosscountry flying closed course flown Example super floater has its best glide ratio 101 say 10 mph know arent going cross much country have fly 10 mph headwind ap parent clubs entered Great Race However some points discussed since last summer can passed whatever its worth de partment super floater bird racing consider opposite extreme Nelson KA-6 new scene soaring Nelson KA-6 fibreglass sailplaneall fibreglass wings tail included appeared scene about eight years ago Weight nearly 11 pounds wing loading over 24 ounces per square foot Stall ing speed about 15 mph L/D about 301 about 35 mph Simply put meant mile high KA-6 could fly 30 miles encountering other thermal Now could find thermal did still thermal 30 miles flier should able find another race course likes Great Race could flown approximately hour 30 minutes utilizing launch above figures merely hypothetical However prac ticability such plane such race must questioned First stall speed 15 mph large landing zones have carefully select ed damage incurred plane type repair required usually beyond Hot Stuff/Monokote requirements Launching requires brute strength 12-volt winch ROG Rise Off Ground imperative cross-country courses can pro vide latter requirements Furthermore because such high aspect ratio visibility such plane good other 12-foot sailplanes mile high would impractical altitude reach doesnt mean ther mals couldnt encountered often course flown lower altitudes however possibility frequent landings would also have considered seems racing per formance gap between KA-6 days popular kits crosscountry racing aspect competition Yet gap can closed todays kits designed around precision/duration tasks performance gap reversed con siders KA-6 type precision/duration spot landing Todays designs ballasted should perform very well cross-country work analyzes FAI scores last summer can seen happy compromise can exist between lazy afternoon floater high performing KA-6 type can surmise outcome race between floater fewer launches required ship much higher L/D possibly requiring twice tows say plane higher wing loading possibly higher L/D would need launch often would necessarily get better mileage time went up point consider trade-off anticipated would advantage ship flew faster required launches could get few times less overall time ground flew slower Something else came arm chair analysis team effort must winning What pit crew auto racing ground crew fli ers Whatever method launching crew coordination must perfected brought up point solution seems long overdue point standardize band signals within soaring regards winch operation relocating upwind pul leys extending line length shortening line length etc would valuable especially outside assistance re quired during contests relocating cause wind shifts example seems signals must effi cient crew coordination during crosscountry work So have al ready devised system workswith out use public address system send way perhaps form standardization can take place meantime talk club cross-country flying pass results way Dan Pruss Rt 2 Box 490 Plainfield IL 60544 Bristol Scout/Headley continued page 46 lower /8-sq spars down board cement place 1/32 sheet ribs upper /8-sq spar tricky item next bending /8-sq leading edge Before try ing add piece soak hot water make bending easier As alternate highly curved portion leading edge can cut 1/8 sheet glue dry cut wing center glue back together using dihedral braces Wl scrap sheet used reenforce trailing edge 82 Model Aviation 5% nitro -$650 gallon 10% nitro $725 gallon 15% nitro $800 gallon 54 gallon drum 15% Custom Blended Bill Hager$21954 HARRYS HOBBIESWESHIP FREE WITH 100 GALLON ORDER 5214 N Dixie Drive Dayton Ohio 45414OM Fuel Dayton Nationals
Edition: Model Aviation - 1977/03
Page Numbers: 24, 82
Soaring THE RC SAILPLANE World Cham pionships now slated March 28 through April 2 US team Skip Miller Dale Nutter Lemon Payne will South Africa competing against least nine other countries according latest report December CIAM Paris meeting announce ment least ten countries competing encouraging Flying same planes did Labor Day weekend finals Denver US team held practice session No vember 20 21 Tulsoar Club Tulsa Oklahoma sponsored event time read least practice session team will heldDallas January 22 23 keeping score some Tulsa results Six rounds flown Payne won three Miller two Nutter Scores winning round ranged Dan Pruss perfect 3000 three tasks wonPayne achieved twice 2552 best speed 146 seconds Nutter Grand Esprit Payne Legionair did 133 laps best mark distance tasks 12 20-mph winds Miller Aquila best lap average 917 Paynes speed average 1628 seconds high overall average scores incredibly close individual performances well Final averages Payne 26838 Miller 25542 Nutter 24325 still wish show support US team contributions can made Mr John Nielsen FAI Team Finance Chairman 3744 Lake Ave Wilmette IL 60091 Although fund raising raffle over fund still open donors Just Wings Enough interest has gen erated least club hold compe tition flying wingsonly flying wings Soaring Union Los Angeles SULA has enough members interest ed such contest 77 Dave Jones Western Plan Service Model Aviation Jan 1977 pg 86-87 no doubt has fluential various designs plans scale buffs Daves book lets contains three views six flying wings Included Horten II III IV Pioneer II Icarus V Horten series German design first designed 1931 1939 Horten brothers Walter Reimer model IV drawing board Horten IVs aspect ratio 2166 graceful departure other bat-wing types Jones drawings include substructure detail spoiler drag rudder locations era current Pioneer II Icarus V designs three views both enough stand-off scale documentation look ing detail Pioneer write Jim Marske 130 Crestwood Dr Michi gan City IN 46360 continued page 82 Below Tiahrt Mrlik launch weeds during last years famous Great Race Crosscountry racing requires team effort pix attest John Nielsen watches Warren Tiahrt Jeff Mrlik Dave Corven Greater Detroit Soaring Hiking Society Above Jeff Mrlik jumps piIots seat Tiahrt takes over land along course Left Jerry Mrlik launches original design what will eventual winnersome four hours 47 miles later Jeff controls RC Soaring/Pruss continued page 24 Brochures two dollars Icarus hang glider detailed information can obtained Icarus Aircraft 37 S Euclid SuiteS Pasadena CA 91101 Cross Country Dick Beltz pumped informa tion cause hes modest comes informa tion latest club hold crosscountry race Lancaster PA Area Soaring Society LASS held event Milton Hershey School Hershey PA Sept 25 course nearly eight miles school grounds win ner Dick Beltz own design Pokey time 49 minutes Dick uti lized high-start five launches Other finishers Don Goughnour 1 hr 06 mm 7 launches Bob Curry 1 hr 13 mm 7 launches Jerry Zeigenfuse 2 hr 04 mm 9 launches interesting note Beltzs over pace just behind set Mrlik/ Tiahrt Greater Detroit Soaring Hiking Society last July during Great Bicentennial RC Sailplane Race Yet Beltz averaged little over mile half per launch Detroit team over 35/I distance/launch ratio Since Great Race much arm chair flying has done fliers competed also observed also some just read about should remembered San Fernando Valley Silent Flyers got race business started happened two years ago inauguration Desert Dash unheard goal 20 miles SFVSFs have recent ly run third other two set up run downwind Now planes compete races downwind direction flight necessarily cut out crosscountry flying closed course flown Example super floater has its best glide ratio 101 say 10 mph know arent going cross much country have fly 10 mph headwind ap parent clubs entered Great Race However some points discussed since last summer can passed whatever its worth de partment super floater bird racing consider opposite extreme Nelson KA-6 new scene soaring Nelson KA-6 fibreglass sailplaneall fibreglass wings tail included appeared scene about eight years ago Weight nearly 11 pounds wing loading over 24 ounces per square foot Stall ing speed about 15 mph L/D about 301 about 35 mph Simply put meant mile high KA-6 could fly 30 miles encountering other thermal Now could find thermal did still thermal 30 miles flier should able find another race course likes Great Race could flown approximately hour 30 minutes utilizing launch above figures merely hypothetical However prac ticability such plane such race must questioned First stall speed 15 mph large landing zones have carefully select ed damage incurred plane type repair required usually beyond Hot Stuff/Monokote requirements Launching requires brute strength 12-volt winch ROG Rise Off Ground imperative cross-country courses can pro vide latter requirements Furthermore because such high aspect ratio visibility such plane good other 12-foot sailplanes mile high would impractical altitude reach doesnt mean ther mals couldnt encountered often course flown lower altitudes however possibility frequent landings would also have considered seems racing per formance gap between KA-6 days popular kits crosscountry racing aspect competition Yet gap can closed todays kits designed around precision/duration tasks performance gap reversed con siders KA-6 type precision/duration spot landing Todays designs ballasted should perform very well cross-country work analyzes FAI scores last summer can seen happy compromise can exist between lazy afternoon floater high performing KA-6 type can surmise outcome race between floater fewer launches required ship much higher L/D possibly requiring twice tows say plane higher wing loading possibly higher L/D would need launch often would necessarily get better mileage time went up point consider trade-off anticipated would advantage ship flew faster required launches could get few times less overall time ground flew slower Something else came arm chair analysis team effort must winning What pit crew auto racing ground crew fli ers Whatever method launching crew coordination must perfected brought up point solution seems long overdue point standardize band signals within soaring regards winch operation relocating upwind pul leys extending line length shortening line length etc would valuable especially outside assistance re quired during contests relocating cause wind shifts example seems signals must effi cient crew coordination during crosscountry work So have al ready devised system workswith out use public address system send way perhaps form standardization can take place meantime talk club cross-country flying pass results way Dan Pruss Rt 2 Box 490 Plainfield IL 60544 Bristol Scout/Headley continued page 46 lower /8-sq spars down board cement place 1/32 sheet ribs upper /8-sq spar tricky item next bending /8-sq leading edge Before try ing add piece soak hot water make bending easier As alternate highly curved portion leading edge can cut 1/8 sheet glue dry cut wing center glue back together using dihedral braces Wl scrap sheet used reenforce trailing edge 82 Model Aviation 5% nitro -$650 gallon 10% nitro $725 gallon 15% nitro $800 gallon 54 gallon drum 15% Custom Blended Bill Hager$21954 HARRYS HOBBIESWESHIP FREE WITH 100 GALLON ORDER 5214 N Dixie Drive Dayton Ohio 45414OM Fuel Dayton Nationals