Quote:
Originally Posted by examorph
Thank you for the very helpful information, the pit crew trials idea is great! and also to the other poster, thank you for the link. 
So if weight is the main priority should I not worry about chasing a very low Cd? I have managed to achieve 0.38 but going lower is taking a lot of time designing and testing in the tunnel do you think its worth it?
Also, if anyone knows of any 4 wheel vehicles that have gone to Cd's of as low as 0.2 or even 0.1 could you please tell me the vehicle details.
Thanks |
The 1987 GM Sunraycer registered Cd 0.089 as a wind tunnel model when the wheel fairings were on.Without them,in full-scale,the actual race car registered Cd 0.12.
George Washington University reported that the wheel fairings on their Sunforce-1 car reduced drag by 34.48%.
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The 1996 HONDA Dream-2, 4-wheel conversion registered Cd 0.10 with CFD.
It has a frontal area of 12.269 square-feet (US),and a Drag Factor,CdA = 1.2269 square-feet.
The Dream is 5.788 times as long as it is tall,with a curb weight of 187.33 kg (413-pounds ).Top speed- 80.778 mph.
At 100 km/h (62.13 mph ) the Dream -2, 4-wheeler required 5.26 kW (7.062-hp) of power to overcome aero and R-R forces.
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The Dream,as a 4-wheeler would be a very good car to mimic.Just remove the PV array to reduce it down to a 'tadpole'/'pumpkin seed' and look for less than Cd 0.10.