7.5HP kicker motor prop, and high altitude

fishrdan

Admiral
Joined
Jan 25, 2008
Messages
6,989
I have a 7.5HP Force that I want to use as a kicker motor on my 18' Crestliner and I'm thinking I'll need to use a lower pitched prop. The outboard has a 8x9 1/4" prop right now and I have found 3, 5 and 7 pitch props for it, but unsure which will be right for a kicker motor.

I also use the 7.5HP outboard on my jon boat which I take up to 9000' and thinking I might be able to kill 2 birds with 1 stone and use the lower pitched prop on the jon boat while up at 9000'. I'm not sure what RPM the outboard is turning at 9000', but if I had to guess it's about 3500, the jon boat is a dog up there and only goes 12MPH on the fish finder speedo, instead of 27MPH.

I know I'm not giving much useful data (accurate RPM and speed) but just want to find out what pitch prop would be useful for a kicker motor and to use while up at 9000' on the jon boat, best guess.

Would a 7 pitch sound appropriate?
 
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