Originally Posted by willk
48 knots on a SR4 with a Yammie 50 is Guinness Book of Records material - the upper end reported for this rig (on here) is below 40kts, mid 30's being typical. There's not much SR4 left in the water at 35kts. I guess that explains some of the replies you've got/are going to get.
Fully agree.. only mono hull I know that is going close to 50 with a standard engine is the V-50 offshore boats. They have nose-cones for cooling water, prop axle is only 20mm bellow the bottom, and they use racing chopper or cleaver propellers. Not even all of these boat do 48...
I don't say its not possible to do 48 in a SR4, i just have hard to believe its possible with a standard 50 outboard, not even with a racing prop on, as aerodynamics is so much poorer than in the V-50 boats. Engine might be tuned or then the output is much more than 50.
As far as i know 2 strokes Yamies have not been sold in USA for a long time, at least not for private use?