bertram31.com

Not really high performance, but our 32 Cary has transom mounted rudders. She turned just fine, that’s why I was curious if transom mounted rudders would work on the 31 Bertram. Haha.. With 250hp cummins in that 32 Cary, the cruise speed was 27 knots and wot was 34 knots

So I can rotate and clock those ZF’s at an angle, bob?

When I get some more time, I’m gonna look at everything again. I just can’t seem to get the shaft even ball park close to where it needs to be to maintain the same propellor location. Motor is sitting almost as low as it can go without transmission hitting the hull. Only thing I can think of to do i...

So, I’ve dropped the starboard motor pretty low to the hull, I have about 5/16” clearance between the hull and the lowest point on the ZF220A gear.. I don’t want to bring the motor any further forward though. It’s definitely eating my lunch. Tempted to just cut barrel off and reweld it to settle for...

Currently setting the 315hp Cummins in our Bahia mar. I have a set of stainless struts I have modified to fit our 31. The barrel angle is 11°… where I’ve currently got the starboard engine and dummy shaft mocked up, the propeller will be sitting around 7”-8” further aft, leaving me scratching my hea...

Haha, I heard that! I’ve already got the new Marlin tower started, once engines and running gear are in place, I think everything else will be downhill and shady! Gonna be a pretty interesting setup. We raised floor height starting at the aft bulk head going all the way to the v-birth. The floor is ...

Apologies for the super late reply. Had some things come up and hadn’t had a chance to work on the boat for a while. But, just got the engines sitting in the engine beds this past week. Once I get a little bit further along I’ll post some pictures. Going to be running a shaft tube from the hull all ...

I’d recommend the zinc coat as well on all submerged aluminum.. and if possible, run a grounding wire to the swim platform on like one of the through bolts... I’m in the marine aluminum fab business, and have seen how fast electrolysis can eat aluminum when being submerged for periods of time.

I second that, bob.

Thanks, tony. I’ve definitely been soaking in all the info y’all are feeding me. I think I’m going to completely rebuild my engine beds and try to get the motors as low as possible. I built mounts that bolt onto the bell housing so the transmissions are floating. Carl, Bob had me second guessing if ...

I see where you’re coming from, I yanked the old original structs off this evening and had them side by side with the new ones and boy is there a size difference.. lol.. but I think I can make them work.

Bob, all I wanted to run was 1-1/2” but the salvage boat we got the motors and running gear & motors from had 1-3/4” shafts. The shaft diameter may be way over kill, but I don’t see how it could hurt performance wise? I’m not going to use all 102” of shaft either. I’m just working with what I got.

Carl, I wish I would have gotten on this forum sooner so I can write about the whole story on our boat lol. There is so much I have yet to add to it. So here’s a little taste... as to where I got the struts, another mariner’s miss fortune with a rotten wood core boat, became a jackpot for our overha...

Craig, yes, we are rebuilding the rudder shelf, have blank canvas to work with. And from what I’ve read on this site I was planning to offset the rudders. Wondering if anyone has tried moving rudders and struts further aft. Bob, I will definitely give it search. I think I’ve read about your setup be...

Anyone running 11° struts and by chance 315hp Cummins? I’m curious to how the boat rides with that setup, I have a pair of 11° struts I’m fitting to our Bahia Mar. shaft logs are cut out and for some reason the guy who did a lot of the fiberglass work for the overhaul, removed and filled in the rudd...