Theoritical hull speed for displacement hull ( keels)is 1.34 multiplied by the square root of the waterline length. A 25 ft mirage probably has 22 ft or so of water line. the calc will give you a max speed of 6.2 knots
Here is everything you wanted to know and a bit besides.This was posted the other day and is amazing!It gives your water line at 20.72 ft. and a hull speed of 6.1.
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