Quote:
Originally Posted by JulianEdgar
I haven't done any measurement but I would think the boundary layer is so thick back there that the gap basically acts as if it isn't there. Here are some pics of a local car after driving on wet dirt roads that seems to support that idea of no / very low flow:
I have done that extensively on my Insight (and all the data on this has already been published) but the damping and springs on the Impreza are too firm to easily do this statically.
I could do it dynamically (with weights in the boot) but to be honest, I can't be bothered.
The big wing provides downforce, and that's good enough for Alexander and me. All he wants to do now is finished sanding it back and painting it!
Basically, I hope this shows for all those people who spend all their time sitting behind a computer and arguing and guessing, how easy and cheap it is to measure real aero data...
Literally, about a day's work and under US$75...
(...and of course that measuring gear can be fitted to almost any car - you can use it for the rest of your life....) |
Other investigators applied measure loads directly over both axles, while simultaneously calibrating the recording equipment as a function of suspension travel.
NOTE: As some rear spoilers produced zero rear downforce, while simultaneously producing unacceptable levels of front lift, this is important enough to take the trouble of measuring.