I feel your pain. I wasted a ton of $ making mistakes along those lines. I went through exactly that problem (almost) with my 39. I wanted a 2:1 reduction, (ZF) but ended up with a 2:6 reduction, B/C the dealer didn't have the 2:1 and it was April, and I didn't want to lose the season, and had to crank the (2 blade) Maxprop up to a very high pitch, It had a very annoying chop -chop-chop sound at certain rpms - then I ended up replacing the engine and got the right 2:1 ratio, and then got a 3 blade so I could go a little smaller, and get rid of that chop sound.
I would be a little leary of going too much past the strut with only a 7/8" shaft, I felt those were too small as it was. If you move it back and get a deeper one, then you have to beef up the glass where you mount that one. Not many good options. I would put it back the way it was, and then continue looking for another boat! Sorry, I am pretty good at annoying answers. Bill Coleman Erie, PA On Wed, May 28, 2025 at 12:17 PM Della Barba, Joe via CnC-List < cnc-list@cnc-list.com> wrote: > The replacement engine I have is getting ready for final testing once I > get the carb fixed. It all looks good so far, but in case it doesn’t work > out the salvage shop down the road has a couple of nice diesel engines that > may be Plan B. > > Here is my dilemma – they all suggest 15 or 16 inch props, maybe a 14 inch > 3 blade as the smallest. The original prop on Coquina was a 13x7 that > BARELY cleared the hull. A 14 inch would be touching the hull. The only way > I can see even doing that is getting a longer shaft and/or moving the > engine aft. This raises the second issue, I cannot seem to find any 14 inch > or larger props made for 7/8” shafts. Do people change the shaft diameter > to 1 inch? That would seem to require a new stuffing box and a new strut > unless there are 1” cutless bearings that fit the stock strut. > > > > *Joe Della Barba* > > *Coquina* > > *C&C 35 MK I* > Your contributions help pay the fees associated with this list and help to > keep it active. Please help by making a small contribution using PayPal > at: https://www.paypal.com/paypalme/stumurray All contributions are > greatly appreciated. >
Your contributions help pay the fees associated with this list and help to keep it active. Please help by making a small contribution using PayPal at: https://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.
