at highway speed do not give an advantage to a sharp ended canoe. At subsonic speeds, a blunt entry and a tapered "stern" work best.
Our 15', 65#, high rocker, blunt ended ww tandem actually gets a bit better mileage on our Honda Accord than our 17', 50#, sharp ended flatwater tandem.
Another wild card in the mix is outfitting inside the canoe. The end bags in our ww canoe seem to stabilise turbulence. This probably makes more of a difference at the front end of the canoe, as it sits on the car. On the other hand, prominent minicell pedestals inside a canoe may impede air flow that has to occur.
There's a lot we don't know about canoe and kayak aerodynamics on car racks. Wish some grad student would supply the data.
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