Quote:
Originally Posted by NickGarrott
Thanks Pat. I know it is strong, I only worry about the thickness for the motor mount bolts. The DF300 is 610 lbs, I thought I needed thickness to resist the bolts trying to pull through.
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Your using two 3/4 cossa boards and then 4 layers of 1700 and your worried about bolts pulling threw? I don't think you need to worry.
I have seen too many heavy outboards out there bolted up with four bolts with small washers on two 3/4 layers of pine bc grade exterior ply that only had a few layers of matt only on the back side. Some how they seem to not fall off into the drink.
Yours seems to be well done and if you use large fender washers or large square washers like use in the electrical field on power poles and strut hangers to spread the load out some you will not have an issue.
On my 20's bracket transom ear I used 4"x1/4" anodized aluminum flat bar to help spread the load of the outboard bolts which is over kill.
You can even take the 4" flat bar and cut 4x4 squares out and use them to back the bolts as washers to spread the load out but that coosa is tough stuff and you shouldn't have much compression issues with it.