Okay finally got this thing out into the water and I came up with the following:
GPS 43 mph @ 6000 rpm
Boat specs: hull wt 800 lbs, motor wt 300, had approx 400 lbs passenger weight and stuff and 8 gallons of fuel.
Using a Mercury Vengeance 16P SS prop
Boat model: witchcraft banshee
Motor: 1978...