Lee200, on Dec 21 2010 - 03:31 PM, said:
If anyone out there can find some scientific info on drafting, I'd love to see it. The '66 mod (and the sports car) draft is based mostly on anecdotal evidence like Brabham saying he could feel a draft so many feet or seconds back of the car in front, etc. And there's precious little of even that floating around too.
I agree. We're all guessing here and I realize you guys are just doing your best with very little resources. So, I started doing some searching.
For some distance behind a high drag car, such as an open wheeled Formula car, the drag of a following car is reduced. This can be of the order of 30% reduction at 25 metres distance, and depends on the aerodynamic details of the two cars. This reduction in drag means that less power is needed to maintain the top speed and enables the car to accelerate (around 0.2g for a 450bhp car of the late �60's), even though it may be travelling at it's clean air top speed. If the driver accelerates from some 50 metres back behind the car in front, while in it's slipstream (drivers claim that they can feel the effect up to 100 metres behind), he will be travelling around 5 kph faster when he comes right up behind it. Popping out of the slipstream now enables him to use this speed advantage to overtake, but he will still use over 0.25 km to draw alongside and hopefully claim the next corner. Fast corners leading onto long straights were ideal for this manoeuvre."
100 meters is roughly an American football field. I'm not sure how credible this person is and it could be complete B.S., but it is at http://www.grandprix...ft/ft00196.html
There is also a very promising article in "Proceedings of the Institution of Mechanical Engineers. Part D, Journal of automobile engineering."
I have only been able to get page 1 of the article so far though (see attached).
Edited by SteveC43, Dec 21 2010 - 08:41 PM.