35 mph

[THEFERMANATOR]

Originally Posted by Jetty Rocker

Sounds like you got your RPM's confused. Normally your RPM's will change @500 RPM's between prop pitches. And If the diameter is the same, you will turn @200 rpm's less changing from an alluminum to a stainless. Maybe this will help.

The new aluminum series for the OMC engines work like stainless props do for the most part. I ran a 19 VIPIR on my bowrider which would run 47-48 loaded down and turn 5600 RPM's. I then tried one of the newer large diameter aluminums that turned 5400 RPM's and ran 45-46 MPH. The diameter as well as blade design plays a large role in propping. I would think the APOLLO 4 blade in a 16 or 18 pitch would work really well on a V-20 for lower HP numbers. A large diameter like a MIRAGE would work well too probably, but I don't think a V-20 is really heavy enough to really need a 15"-15 1/2" prop.