Quote:
Originally Posted by aerohead
The conclusions drawn in the peer-reviewed technical papers are contextual.I believe you touch on that in your book.
|
Well, of course. But 'contextual' is the whole issue here: the context is that in some cases, full wheel covers increase drag. Isn't that the point?
Quote:
Originally Posted by aerohead
I didn't give any advice that I know of without caveats.
|
I am sorry, but I have seen lots of advice here - including from you - that is stated without any caveats whatsoever. Here's an example that was being used in a signature:
"At 55 mph, a 10% drag reduction translates to a 5% increase in fuel economy. At 70mph,a 10% drag reduction translates into a 6% increase -Phil Knox (Aerohead), Aerodynamics Seminar #2"
No caveats there.
(Nothing on what proportion of total drag is made up by CD vs rolling resistance - which is car-dependent? Nothing on the change in engine efficiency - BSFC if you like - as the rpm changes? For a discussion of this sort of thing, see Barnard,
Road Vehicle Aerodynamics Pages 54-55, and Stone,
Motor Vehicle Fuel Economy, Page 136.)