Quote:
Originally Posted by freebeard
Aren't all cylinders rectangular? Excepting [s]non-parallel[/s[ right angle end caps?
My point had to do with putting a balance beam with two models in a wind tunnel. (Or on a platform on a moving vehicle).
At Permalink #29 I showed Wally Byam's teardrop with a 50% radius on the front edges. Airstream have brought this back in their Base Camp model.
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* I'm not in possession of the necessary data from which to accurately answer that question.
* I chose 'square', as, from a 'forwards', or 'rearwards' observation point, most RV travel trailers have a 'rectangular' footprint.
* If you design edge radii from the 'height', it won't match the 'sides,' and vice versa.
* By using the square-root of the frontal area, you get a 'compromise' radius which agrees all-around ( this was formally presented as an an aerodynamic 'solution' in Hucho's 2nd Edition book ).
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* I don't comprehend what you're describing when you you use the term 'balance beam', and I'm reluctant to speculate.
* I see no advantage to Wally's design, nor the Base Camp's.
* 'Aerodynamically,' there would be no gap between the TV and TT.
* Their frontal areas would be equally matched also ( take a look at El Paso ( Texas ) Sun Metro's, NFI Group's, low-floor, articulated, 100% gap-filled, pusher-trailer transit buses ).
https://www.flickr.com/photos/drum118/48193865117