Re: I Need A Shrink !
1.78:1. You are gonna like the duoprop.
The 290 drive had two gear ratio's that I know of. The one I had wasn't marked. If yours is the same, you may have to infer the ratio from the year it was built. My 290s ratio was 1.91:1 (I think) I ran F5 stainless props and it seemed about right, max rpm: 4600 rpm, medium load.
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