Quote:
Originally Posted by JulianEdgar
I think it is impossible to accurately calculate Cd* by coastdown tests, without very sophisticated data gathering (including real time wind/yaw) and very good modelling (including all rotational inertias).
Given the high speeds you are using, it might be possible to measure some relative changes in drag. Do the tests again with windows up / windows down and see how much consistent difference in speeds you can record after 50 seconds.
(* let alone to three decimal places!!)
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Yes this test isn't intended to find the real Cd but to find a "good" method (or refine and fix it for a better estimate)
to estimate it and make relative comparisons with the various upgrade made
I will do the Windows Up/Down test. I promise
