50 johnson

[JohnsonM50]

I am not sure that any work has been done to it or not. I got this prop given to me years ago. It may be like the old saying "you get what you pay for"

I think the gearcase is about 3:1 so with 25 pitch at at 5500Rs [conservative est.] your at about 40-42 depending on efficiency. If the gearcase is a different ratio this would be out the window.

[fs5]

the johno (omc)50's ran a 2.3 to 1 ratio ,

[JohnsonM50]

Thatll bring it to the low to mid 50s

[OUTBOARDER]

Turning the 13 X 25P on Clydes Ride 5,000rpm is about 46mph.
No trim , notice that moving back in boat increases speed with no change in rpm. The cup definitely makes a difference which bumps the speed up and makes my spreadsheet wrong . Am looking for 50' s with low water pu on the 15:28 case and a little exhaust work.

[JohnsonM50]

Turning the 13 X 25P on Clydes Ride 5,000rpm is about 46mph.
No trim , notice that moving back in boat increases speed with no change in rpm. The cup definitely makes a difference which bumps the speed up and makes my spreadsheet wrong . Am looking for 50' s with low water pu on the 15:28 case and a little exhaust work.

was adding that at a potential 5500, actual Rs youll get, ride conditions, slippage & resistance are a ruff guess. [in my experience usually less than ya hope for ]