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how about spraying a less viscous gas onto the surface , like ? only be good for a short run however, On the boats they vent air under the boat for a pretty big difference in drag at moderate speed, i think volvo patented it maybe 15 years ago , used on quite a few high performance boats now I think formula yachts uses it, in the james bond move, the world is not enough there is a sport cruiser driven in a chase scene in teh very beginning, we have the identical boat at the marina where i work and it has huge slots midship to carry air under the hull, heard it makes around 15 % improvement. course not really applicable but interesting.
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