Mariner 40hp ex navy mid shaft rpm range
i have got the above engine on my 4m searider and took it for its first outing last weekend
flat out with me and the mrs on it was reving to approx 5600-5700rpm
with me and 2 others it was about 5300rpm
these seem a bit to high to me so i think i will need a larger pitch as it will mainly be used by me and the mrs and occassionally a few others. it has a 13" at the moment so would a 15" sound about right?
another question is idealy i want a stainless prop for it but have heard tails about if a 15" alloy prop is correct then i would need a 16"-17" stainless due to the extra weight and better efficiency of the stainless...... is this true or do i just get the same?