Не надо фантазий от фонаря, есть формула D2=D1*(B1/B2) в степени 1/5
где D1 - диаметр двухлопастного винта
D2 - диаметр винта с другим количеством лопастей
B1 - количество лопастей исходного винта
B2 - количество лопастей искомого винта
А просто русским языком, относительно исходного диаметра двухлопастного винта, для трёхлопастного коэффициент 0.92, а четырёхлопастного 0.87
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