Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Boattail the most aerodynamic car... an Insight

Bicycle Bob · 08-13-2009, 04:06 PM

1. Yes, Kamm's principle still holds. You might be able to increase the slope on the back a bit, but for detail shaping, use a small lip on top and a concave rear panel, to get a single large, attached vortex. Rounding rarely helps that part of a bad shape.

2. Hermie, The flow should already be close to separating. Rounding only worsens the trailing turbulence. This was thoroughly tested by Dr. Wunibald Kamm, producing the most famous principle in automotive aerodynamics.

08-13-2009, 04:06 PM	#36 (permalink)
Bicycle Bob EcoModding Apprentice Join Date: May 2008 Location: N. Saskatchewan, CA Posts: 1,805 Appliance White - '93 Geo Metro 4-Dr. Auto Last 3: 42.35 mpg (US) Stealth RV - '91 Chevy Sprint Base Thanks: 91 Thanked 460 Times in 328 Posts	1. Yes, Kamm's principle still holds. You might be able to increase the slope on the back a bit, but for detail shaping, use a small lip on top and a concave rear panel, to get a single large, attached vortex. Rounding rarely helps that part of a bad shape. 2. Hermie, The flow should already be close to separating. Rounding only worsens the trailing turbulence. This was thoroughly tested by Dr. Wunibald Kamm, producing the most famous principle in automotive aerodynamics. Last edited by Bicycle Bob; 08-13-2009 at 05:43 PM.. Reason: Postings out of order written.