Well, for your own safety at least, you did install a small radius edge at the top and sides. Certainly better than a near 90 degree angle or edge.
I will suggest adding a rubber lip of some kind to the bottom edge, not so much for aerodynamics but as a safety edge. If you can catch or cut yourself, you will, just a matter of time and circumstance.
Edit
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While out at lunch today I saw a tow truck bumper similar to the one linked below.
https://www.pushbumper.com/images/hp...ugust-2011.jpg
I thought it was interesting that when the middle part gets pulled out, the corners can get bent back at an even greater angle.
I'm not 100% convinced this is anymore aerodynamic than a less protruding version, mostly because of the pressure bubble (
gradient) I mentioned earlier, but it does at least look more aerodynamic.
Bluff Body:
http://fluidsengineering.asmedigital...icleid=1431196
Stagnation Line:
http://fluidsengineering.asmedigital...icleid=1484273
Edit-2
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Nice custom bumper with built-in winch on one, not exactly aerodynamic (
so much air underneath) but very clean looking for what it is.
http://www.cncoffroad.com/custom-bumper-fabrication/
Quote:
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We offer custom bumpers for almost any vehicle! Jeeps, trucks, cars, custom vehicles, and more. Made from 3/8″ and 3/16″ steel, we make sturdy bumpers with high-quality fully welded front and back seams.
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