The Seafari 25 will plane comfortably at 12 knots with a 5.7 duoprop.. At SeaBird 24(24 degree deadrise, very low cg) will plane comfortably at 11 knots with the same power. Never needed the slow plane with the Seafari, but it was a gift from heaven with the Seabird.
I think its cg and torque that has the most effect of low planing speed.
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