50 johnson

[Frank_King]

The transom bracket is yamaha pro 50, the steering arm and all other stuff is johnson 60.
I went to the machine shop and had some bronze bushings made. The bushing took up the od and id slack.
looking for any thoughts or hints. I am about to install on scat cat tunnel.

Frank.

[Ron Hill]

Pop the cowling off that motor, please, and take a couple of pictures...Could you post a picture or two of the Scat Cat???

60 HP, two cyclinder???

I think you have a "FAT C" here!

[JohnsonM50]

Ive got a 72 50hp Evinrude & found by curiosity that a stainless prop from an OMC 115 would fit the shaft & needed a minor change to bolt on,, made that thing come alive! Adds to your selection options anyway.:cool:

[OUTBOARDER]

Tried a 13" X 25P SE PROP on a 1986 twin and it worked much better than the 11-1/4" x 21P, Engine was set at 22" above the pad.

See Clydes Ride

[Ron Hill]

IS that "Slip on Hub" made out of one piece of aluminum??? Back when Howard Pipkorn was running SE, I made some slip on hub from aluminum billets...actaully, Donnie Spencer made them for me...I made a prop for Howard that I called "Jack the Bear"...much like the one in the picture...Howard won the SE World Championships in Beloit (I think) about 1976....

ADD:

We made the for Fj and SJ also...worked good to prevent "BLOW OUT"...

[Frank_King]

28046

28047

28048

I had to cut bottom pans to make them fit.

[Frank_King]

28049

25p is stamped on it, not sure what it is.

[JohnsonM50]

Id guess it is 25 pitch then, does it look to have been worked on?

[Frank_King]

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"

[formeone]

curious how fast you running ie how much improvment you got with bigger prop???.. and what sort boat you running??? ,,thanks,,

[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 :rolleyes:]