It was a Volvo 280 boat. I put it at 17.5 per Jo at pantera.

Bravo 1 drive now. Mr. Gadgets has the drive at present.

12-14% slip after the prop is dialed in would be realistic.

I am at 10% or less depending on which prop. And what number you use for the B1s. Corrected or not

Good point^^^^^^^^
For a 26 pitch Bravo use 25.3 not 26.

Gonna need more prop if that engine is anywhere near close to 650 hp. Hang on tight.

BBlades recommended the 26 bravo 1 with all the info I gave him.

With my luck, I'm sure It won't be that easy.

I have an '84 Corsa. 26x7 hull. X is 18.5".
Ran 68 mph at 5300 rpm with a 24 Bravo
Runs 67 mph at 4800 rpm with a 26 Bravo


So, roughly 12% slip..