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Dubya dubya,
Let us know just at what stage of the repower you are at because Neil is right, the old reduction gear can be fitted to the new engine with a only bit of trouble but not as much as with eliminating it completely. That job would need:
1 new prop
2 new shaft (down to 3/4" dia. and longer length
3 new shaft seal
4 new cutless bearing
I general, a bigger wheel(prop) is always a tad more efficient with all other factors being equal. This is true with our Col. 36.
The Col. 36 does just fine with a 16x10 or 16x11(mine). We have the luxury of having a big place to swing that wheel. I did a lot of reading, mostly Dave Gerr's Propellor Handbook, and it turns out that our boats were just fitted quite well in the first place. Restoring the original setup would be the best.
Mine bites good, and because it is aft of the rudder, backs like a forklift.(that's a good thing)
Russ
__________________
 Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1
"Since when is napping doing nothing?"
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