Super User J Francho Posted January 16, 2018 Super User Posted January 16, 2018 I have an aluminum foil on my Bullet 21XDC/Promax 2.5L. I'm also running a four blade prop that has lots of stern lift. Boat planes in just under four seconds at 16-17 mph. The foil has no effect on top end, since it's not in the water when the boat is full planed out. Quote
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