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| OS FS.20 4-stroke powered Senior (Tileston) |
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| FX Ryan (L) Eut Tileston (R) K&B .29 |
At Galesville, NY 1990
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| Eut |
Inverted engine
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| Eut Tileston (L) Colin Borthwick (R) Queensland, Aus. |
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| Mervil Lispsey Lake Sam Rayburn, TX |
Scorpion Major: Upright engine (low thrustline)
Scorpion Senior: Inverted engine (high thrustline)
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