Westronics wrote: Another possible (but this one is practical)
I'm not sure this idea is impractical. We've talked about boat tails before and I always assumed they would have to be upwards of 20 feet long to provide much in the way of a benefit. The Dutch claim the optimum length is only 2 meters or about 6.6 feet. That is much more plausible and perhaps it would scale down slightly on a MH. The device they show could be modified to fold flat against the rear when not driving. If the gain is real they might start to show up on trucks and motorhomes. The pressure to increase fuel economy is only going to get worse in the future. Besides, I wonder what happens if you add AirTabs to the rear of the boat tail??
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