Quote:
Originally Posted by Blue_Heron
There's one other thing to look out for. A thick inner laminate spreads the crushing/puncture loads from the engine mounting bolts. Your thin laminate won't, so either get large fender washers or plates to spread the load over a larger area.
Dave
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I suggest getting a couple of feet of 6061 aluminum C channel. Per ASTM B 308 with the rounded inside corners. I used 3 x 1.75". I put 2 feet down in the bilge. Use that as your "washer". It will transfer the load across to the box stringers. If you can handle the look, 3 feet of the same up in the splashwell will help spread the load there, too. With a little handiwork with a file and drill, you can use it as a cable trough for the outboard wiring harness and transom mounted depth sounder wiring harness.
To me, it makes more sense than trying to crush plywood under a fender washer that is distorting under the bolt load to become dome shaped.
I used this:
http://www.mcmaster.com/#1630T321