I forgot I had them but back in the DRMO days I got 4 large crates that had a large aluminum skin box shaped float. The back was open side and filled with foam, there are slots cut into the top and bottom edge to mount it . There was no writing left on the box. Did the goat have an add on float or were these maybe for the M113 surf board. I will have a picture tomorrow, it's raining.
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The trim vane for the M113A3 is made of plywood with aluminum. How big is your mystery box? I have a 113 in the shop right now that I am servicing and I could tell you from your pic if it would fit or not.
Goats were supposed to float......getting them to float was another issue.
Most vehicles that were designed to float and drive on hardball did neither well.
When I was at Fort Benning my unit used to have to take a M916 and lowboy out to Victory Pond and wait for Bradleys to sink while doing swim training.
It used to piss off the TC when we asked if they wanted to go ahead and hook the cable to the tow pintle so they wouldn't have to dive down to do it.
The DUKW was an exception...it think it was one of the better vehicles the military bought.
Ok here are pictures, the float or whatever is 5'8 1/2" long, main body is 6 1/4" thick and 25 1/2 high, edge of mounting flange to flange is 30 3/8" the metal is 1/4 thick. There are eight 1" and two 3" tabs cut into the top flange and only 3 elongated holes in the bottom. You gan tell it been in the shed for years, the other 3 are still banded in plywood boxes. So any body got an idea??
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I have never heard of or seen an official bow for a Goat. I have read where a barrel (or barrels) would be tied around Goats in order to help them float, but the extra drag it created all but negated any forward trust the wheels could produce. I don't recall anything in the TM's.
How about M114?
Goats would float if you could drive them into the water at a very shallow angle. If you hit a drop off or came in too steep you'd end up driving them under water.
The one's with the aluminum-blocked engines were not as heavy in the front but it only meant you could retrieve them with a lighter wrecker.