I would think that it depends on several factors... width and height, where any additional braces would be... it isn't just a simple answer.

Ed

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"André Langevin" wrote in message ...
mmmm seems nobody is building in aluminum...

"André Langevin" wrote in message ...
Hi, does someone knows the thickness required for an aluminum transom to support the weight and pushes of a 200 HP engine without deforming ? I guessed 3/8" but i'm no engineer.

Any advice would be truly appreciated.