Hi Syd I should have said the wider width of the propwash as it spreads out behind the prop. Imagine an adjustable beam maglite when your standing in front of the plane. The 7150 would have had been just wide wnough to encompass the tail. The 7148 however would have been a much wider rearward beam going well wider than the tail. Wide enough in my case to include the inner 1/2 of each wing and the gear. Then imagine the lighted part of the plane being in increased drag relevant to the higher speed air. I'm terrible at explaining things exactly as I think them most times.
Claude
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