07-03-2015, 10:43 AM
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#15
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Moderator Emeritus
Brand: Thor Motor Coach
Model: 2011 Four Winds 28Z
State: Michigan
Posts: 1,273
THOR #531
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Quote:
Originally Posted by blw2
What I was trying to get at, was that I think the air tabs simulate the tapered bike helmet by adding energy to the airflow, so that it flows back smoothly similar to the bike helmet, rather than folding back in behind the blunt rear which causes the eddy currents, turbulence, and drag.
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That is kind of what the NASA article was saying... I think.
From the NASA article;
"At the back of a trailer, box van, or RV, Airtabs radically alter the airflow to reduce drag in two ways: Shifting the airflow pattern from vertical to horizontal to eliminate large eddies, and smoothing the airflow to artificially simulate a tapered rear of the vehicle."
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