Quote:
Originally Posted by wyatt
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.  |
Quote:
Originally Posted by orbywan
I wasn't sure about the length, but I'm glad they allow 4 feet, that's more like it.
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Hi orbywan and wyatt -
I don't mean to split straws, but in actuality, the FMCSA (Federal Motor Carrier Safety Administration) allows us big rig guys up to a 60" boat-tail.
Not sure how much that 12" will help, but my the nice folks that make that Trailer Tail, ATDynamics, are building a custom unit for my new trailer. So I guess we will find out after we model it and build and test it.