Have much searching, I found that the transmission I have is a ZF10M which mates perfectly for the power of the Yanmar 3JH4E: 39hp. The transmission has a gear ratio of 1.48 for forward and 1.86 for reverse. The RV-10 has a ratio of 1.29. Combining the 2 ratios for forward gear would give me ratio of 1.91 at the prop, if I'm calculating this right. I want to know this because Flex-o-fold wants to know the gear ratio use use in calculating the pitch of the propeller.

Thanks,

Mike