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Old 11-23-2010, 02:35 PM   #8 (permalink)
COcyclist
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TDi - '04 VW Golf
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another tyro weighs in

Quote:
Originally Posted by Cd View Post
The angle of the back end is really steep - about the same as a new Beetle.
How did he get such a good Cd with all that flow separation ?
The Honda 600 is a very narrow car (just over 3 feet wide IIRC?) and to my eye it looks like the back window is a compound curved polycarbonate. It does appear to be too steep from a side view but there is probably a lot of taper from the sides. The New Beetle C pillar has sharp edges and minimal plan taper. I believe this creates two big trailing vortexes and increased drag (I have seen a fastback diagram from the Hucho book somewhere that shows this). The smooth compound curves on the P-100 would help fill the wake and reduce drag. The back end of Honda reminds me of the front of the Bullet Train I rode in 1979. It also looks like there is a 4 upslope on the rear diffuser. I wish we had more photos and info on this car. Thanks Phil, good find!
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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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