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Wings with a Twis tSteve McKinlay, s.mckinlay@xtra.co.nz42 R/C Soaring Digest
first became aware of Pitcherons/I Wingerons not long after I first becameinterested in flying RC sailplanes in 2000.At the time, threads on RCGroups andelsewhere inspired my imagination ofwildly twisting, fast flying slopers. I hadno experience with flying sailplanes, butthat didn’t stop me dreaming of flyingthese high performance planes. Soonafter I bought my first RC plane (an EPPP51) and learnt the basics of flying. Myprogression of learning after that wassimilar to most, a couple of EPP planesbefore my first crunchy (a 2m Mefisto),my first molded plane and various otherplanes over the next six or so years.A little history first. As far as I have beenable to research, wingerons have beenaround for a long time with the 160" HegiSB10 wingeron in the late 1970’s alongwith the Sailplanes International Axel inEurope and the Bridgeman Snipe in theUS of around the same era being someof, if not the earliest designs using thiscontrol method. Others since then havemodified well known planes like theHobie Hawk and Sagitta to wingerondesign.The pitcheron control was invented as faras I can see by Ken Stuhr of VS Sailplanefame in the late 1980’s when he designedand built the now famous Rotor. Kendesigned and built what are consideredby many to be some of the finest (andnow rarest) examples of pitcherons andwingerons: the Rotor, Vmax and Xica.These slopers were responsible forinspiring others to design their own TWFplanes.The slopes around the Tri City areain Washington State (Eagle, Chandlerand Kiona Buttes) and the NorthernCalifornian coastal slopes are perhapsthe spiritual home of the TWF (twistywing fetish) designs. This is where Kenand others such as Charlie Richardsonand Harris Nelson designed, built andflew their planes and made them famous.Since then others have fallen in love withthe sleek designs and high performanceand have designed and built their own,some going onto commercial production.Examples include the Charlie RichardsonTurbo, Tom Feldvebel’s Kestrel, SigSamurai, Harris Nelson’s Shrike andothers including Harley Michaelis’ Orca.Recently there has been renewed interestin production models including someshort run of kits such as the re-releasedShrike and Shredder, the Pica and Ultron.The term TWF refers to both twisty wingtypes, and was thought up by BrianCourtice in his Ultron build thread onRCGroups. It was taken from a relatedterm: PNF (or pointy nose fetish) whichwas coined by Brian Laird to describethe predilection for pointy fuses of thefast and heavy planes which originated inNorthern California.Other priorities overtook my life (I wasfinishing Uni at the time and just startingmy first serious job and lost a lot ofmy spare time) though I still kept flyingwhenever possible. I had come acrossthe Orca, a 70" pitcheron designed andbuilt by Harley Michaelis – a well knownsailplane designer and builder (includingthe Genie line and the RDS) and fell inlove with the sleek purposeful design,but never figured I would be able to buildone.Years later, after some more experiencein flying and building, I came across theplans, Harley was generous enough tomake them publicly available with thehelp of his friend and TWF guru JayDecker. The design was for a slab sidedfuse made from wood, ply and balsa andcovered with fiberglass. At the time, I hadlittle experience in building planes fromscratch, but was playing around withbuilding wings with a vacuum bag. Theplan appealed to me in a number of ways– it was a beautiful plane, it looked easyenough to build, I could attempt my firstcomplete vac bagged wings, and it was apitcheron. So I printed the plans, boughtthe wood as well as some high powerservos and started to build.It came together much easier than I wasexpecting (with a lot of help via a buildthread on RCGroups). I’m no masterbuilder but I found the plans easy enoughto understand and managed to getthrough without any major dramas.I did change the plans in one crucialway – a fellow RCGer had generouslydonated a pair of beautiful machinedOctober 2008 43
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Page 3 and 4: R/C Soaring DigestManaging Editors,
Page 5 and 6: the towmen and the strength of theh
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Page 9 and 10: Tents are a poor description of the
Page 11 and 12: of the juniors from Seattle so I di
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Page 15 and 16: The WorldChampionshipsThe Team Even
Page 17 and 18: US Junior WC F3J Team: Dave Kalamen
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Page 23 and 24: spin and managed to fly the plane b
Page 25 and 26: Above and clockwise: Junior Team to
Page 27 and 28: Clockwise from above:The Supra wing
Page 29 and 30: Joe Wurts, Manager for Team New Zea
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Page 33 and 34: Above and right: Cody Remington pre
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Page 37 and 38: The F3J WorldChampionship Fly-offsT
Page 39 and 40: Ben Clerx’ plane box and travelin
Page 41: Above: Ordering at McD’s is easy
Page 45 and 46: We agreed that Dan would launch for
Page 47 and 48: out light and stiff and looked up t
Page 49 and 50: Uncle Sydney’s gossip columnMiles
Page 51 and 52: quite as grand for this club compet
Page 57 and 58: Rol Klingberg built and flew hang g
Page 59 and 60: The KW 100 awaits another flight. H
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Page 65 and 66: The FerengiRules of SoaringBy Peter
Page 67 and 68: Tinamous are strictly neotropical b
Page 69 and 70: Tinamou SpecificationsSpan 95"Chord
Page 71 and 72: The finished tip panel ready for sh
Page 73 and 74: One of the two tow hook blocks inst
Page 75 and 76: in the hatch, thus holding the hatc
Page 77 and 78: in handling, but I’ve since remov
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