Transom Bracket - twin outboards

BA17 · #1 07-16-2010, 10:52 PM

I run twin F150's on a twin bracket as well and have no problems. I have fished the boat in some nasty weather and have never had the props slip at all. I was thinking it may be a prop issue, but sounds like it may be something else. What length are the shafts? Could the bracket be mounted too high? Could the bracket be mounted too low?

lobo1 · #2 07-16-2010, 11:06 PM

Wow! BA17 Glad to see you chime in here!!!! maybe you and I could compare a little information.

This boat I bought is wayyyy too nice to not be able to enjoy the ride in rough water! As it stands now - I can only run about 18 mph in the slop w/o prop issues.

Let me see what I have tomorrow with the motors lowered to the last hole and then if need be - I could compare your specs to mine????

peterb · #3 07-16-2010, 11:50 PM

Been there & done that. For years I ran a 1972 23' with twin 200 HP OX66's (see below picture). Also, it had an enclosed transom and a full flotation bracket.

I have the following questions for you:

Does the boat sit stern heavy in the water?

Do you have any balast materials up front?

What type of props are you using?

What kind of trim tabs are you using, and are you sure that they are properly working?

Have you checked your bracket to see if she has any water leaking into her?

Here is what I did with my set-up to get her dialed in.

I put 200 pounds of lead up front in the bow hatch

I had the engines mounted in the mid level setting on the bracket.

When the engines were at the highest level setting my 3 blade 19 pitch & 15.25 sws props were capable of coming out the water. When I put on 21 x 14, 7/8 props they did not come out of the water anymore.

SeaCraft's with brackets and alot of engine weight need alot of trim tab. I had 16 x 12 Bennett sportman trim tabs. I was not happy with their performance initially. I pulled the boat of the water and saw that the tabs were not working that well. It ended up being that I was a little low in transmission fluid. When I filled the system up, I had far more responsive tabs and a better handling boat.

I eventually went to 4 blade power tech props. They gave me decent stern life and improved the boat handling. My speed at WOT went down from 56 MPH to about 47 MPH, but I was happy with the trade-off.

If you have any specific questions, please let me know.

Regards,

Peter