Quote:
Originally Posted by orbywan
In the USA, trucking regulations limit the length of a boat tail on a 53 foot trailer to 18 inches, I believe, which is not even close to optimal.
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I remember reading that as long as the extension is not increasing cargo volume, that on semis and the like, a 4' extension is allowed for aerodynamic pruposes. I have seen a number of extensions on semis that are more than 18" in length, and reports say that the 4' versions are good for about 7% FE increase.
