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Old 10-10-2018, 12:56 PM   #748 (permalink)
COcyclist
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Join Date: Dec 2007
Location: NW Colo
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TDi - '04 VW Golf
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90 day: 53.4 mpg (US)
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Quote:
Originally Posted by freebeard View Post
Any luck with the second one? VW-P3 appears equivalent to my Dasher while VW-P4 appears equivalent to the Rabbit/Golf.

I don't understand the two VW-P4 but only one VW-P3 profiles.

It looks like if the Dasher's profile was pushed to 74 it would be a slippery as the Golf/Rabbit. Does it make sense to apply the lower left scenario to the upper profile?
Perhaps these were all wind tunnel mock-ups of the mkI Golf/Rabbit. The 34 degree in the lower left looks closer to the mkIV Golf (my car) and if I read the graph correctly the triangles show lower Cd. Somewhere on here I remember seeing the back should be chopped at vertical for lowest drag.
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Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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