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So 62.72 CFM * 1.0756 = 67.46 CFM, making lots of assumptions.
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That seems reasonable. My 1600cc engine is supposedly produces approx. 1500cfm of cooling air and 1500cfm of exhaust.
I was thinking about the radiator air at max body width. In the wake I'd mix the exhaust and air at the last possible moment, in a stainless steel muffler tip that looks like a high-bypass jet engine.
The Dyson fan may be more or less efficient than you computer cooling fan. It's moving air at 55mph in a still room, in a moving vehicle more velocity might be required. But 1200cfm from 400watts would consume ~1/2 horsepower.
Note the circle is about 1 meter in circumference and the slot is 1.3mm. A 1 foot circle would be at the end of a long boattail.