DIY static outboard bracket

[peiserma]

Originally Posted by garagenc

Inside I would use a full plate 1/4" thk across the transom to disburse the force on the transom. The plate should be a minimum of 4" larger than the distance across and above the outside area of the angle frame dimension.

Thanks for the detailed reply. I'll have to see what the local scrapyard has for stainless angles. Its not inexpensive.

I assume the inside plate can be aluminum since it's basically funtioning like a giant washer. Would you think that a 6" or 8" square plate for each of the bolts would serve nearly as well, or would you stick with your recommendation of a giant plate? I think an 18" 6061 aluminum plate 1/4" thick can be had for around $40.

The old motor was bolted to the transom with 4 bolts. OK to bolt bracket to transom using just these four?

[Destroyer]

Originally Posted by peiserma

I assume the inside plate can be aluminum since it's basically funtioning like a giant washer. Would you think that a 6" or 8" square plate for each of the bolts would serve nearly as well, or would you stick with your recommendation of a giant plate? I think an 18" 6061 aluminum plate 1/4" thick can be had for around $40.

NOoooo If you use Stainless Steel for one side of the bracket and Aluminum for the other you'll have two dissimilar metals and that will result in galvanic corrosion. Whatever metal you make one side of the bracket from you must make the other side of the bracket from also. Personally I would recommend using 1/2" thick Anodized Aluminum for the bracket since your engine is made of Aluminum also, and you want to keep all metals as close to the same as possible.

Originally Posted by Peiserma

The old motor was bolted to the transom with 4 bolts. OK to bolt bracket to transom using just these four?

Yes. The original holes will do just fine for the inside part of the bracket.