Quote:
Originally Posted by drmiller100
three different angles involved.
the top is REALLY safe at 20 degrees. 20 degrees is ABOUT 1 inch of drop in 3 inches of run.
The sides are "pretty safe" at 20 degrees, and REALLY safe at 15 degrees. Again, 1 inch of drop in 3 inches of run is pretty safe for the side.
the bottom is best left at 10 degrees. one in 5.
so. assume 96 wide. each side is 48 inches "wide". one in 3 would mean the back would be 144 inches long, which is pretty silly.
if you can make it 60 inches long you will get the vast majority of the benefit, as your top and bottom also taper.
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When you are saying "safe" are you assuming I'm making the sides a curved surface as best I can, or is that also ok even if the sides are just flat? I'm going to try to make the sides curved as best I can, but I don't have a way of rolling the tubing, I can only make multiple small bends in the tubing to approximate a large radius bend.
60" long seems like a fairly logical length from a feasibility standpoint. Any more than that is going to get unmanageable. Trailer is already 26' long without tongue.
I wonder why none of the new trailers out there have such features. Do ALL people pulling trailers seriously not care about fuel mileage? At $4/gallon for diesel I have to care. Would think they would have fuel saving options and show valid proof of such an addition. Seems like people would be interested if it was built in a way that looked "factory".
Is there a commercially available "drag reduction semi-cone" for the rear of trailers?