Quote:
Originally Posted by ennored
Phil had posted some Cd reduction vs. template percentages somewhere. I copied them and other info into a spreadsheet. Assuming a three sided, flat bottom tail, the transom reduction doesn't follow the Cd reduction. And suggests even a short tail has the potential to make some pretty substantial improvements.
% Template Transom reduction Cd reduction
0 0 0.0%
10 2.1% 23.2%
20 6.2% 38.7%
30 14.3% 50.8%
40 25.8% 60.2%
50 40.0% 66.8%
Crude math, lots of assumptions, blah, blah, blah....
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Ah right. That!
I guess that making the air detach cleanly is worth 11.6% better MPG, because the improvement is huge, compared to the transom reduction!
I love math, especially when I am supposed to be doing something else (I wonder if I already did this somewhere):
% Template Transom reduction Cd reduction Additional increase
per segment per segment per segment
10 2.1% 23.2% 23.2%
20 4.1% 15.5% 12.6%
30 8.1% 12.1% 8.7%
40 11.5% 9.4% 6.2%
50 14.2% 6.6% 4.1%
Those are some diminishing returns!