[aerohead]

Originally Posted by JulianEdgar

I looked up each of your quotes and they're generally either taken out of context, refer to 'shapes' (not real cars), are a bit simplistic or are rather tortuously applied to support your theories.

All the professional car aerodynamicists that I asked to comment on the topic of 'what influences base pressures?' on real cars said there was no single answer, and the influences of various mechanisms were poorly understood.

My summary thus remains:

1. There is no simple, pat answer as to what influences base pressure on different cars.

2. Therefore, without testing, you're working very much in the dark as to the effectiveness of modifications.

3. Higher pressures on the side of the car, especially towards the rear, will likely increase base pressure. (And my testing clearly shows that higher side pressures occur with better flow attachment.)

4. Thick boundary layers towards the back of the car will likely increase base pressure.

Thanks for the response. The clocks about to run out here, and no time to cover all the items. I'll be back Friday, with a fresh 'clock' and will get back into it. Thanks again, see you Friday.