Charlie, thats Dave Williams, the Tailwind is a W-8, he is on the rotary Site here. I have a W-10 with a rotary B-13, Marcotte drive, 2.1 to 1 redrive. With prop speed at 2900 the cruise is above 230 mph. Being 88 years old and family matters I havn't flown it lately. John Downing Marion, MI
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