I have an older 25 foot Eliminator. Here is the boat (http://www.dcperformancecarbon.com/images/boat3). Mild BBC powered making maybe 375hp.
The drive is a Stern Powr (http://www.dcperformancecarbon.com/images/drive1) and the prop is a 14 1/2" x 25.5 pitch.
Using this prop calculator (http://www.rbbi.com/folders/prop/propcalc.htm) it shows I have 38% slip.
I have not had the boat on GPS yet but my speedo indicates 50mph @ 4400RPM. Could my speedo be that off? Maybe my tach? The calculator says at 20% slip I would be doing 65.
Next thing is where the hell do I find a prop for this boat if indeed all the numbers are correct?
The prop shaft is strange from what I can find.
19 splines, 1 3/8" dia shaft but the splined part is smaller. Then on the outdrive side there is a steep taper to about 1 11/16" . Also the splined portion is welded to the actual prop. Below are some pictures. Any help would be great.
Prop 1 (http://www.dcperformancecarbon.com/images/prop1)
Prop 2 (http://www.dcperformancecarbon.com/images/prop2)
Prop 3 (http://www.dcperformancecarbon.com/images/prop3)