|
This may not be the exact right thread to post this, but so many threads seem to devolve into discussions about the ideal template, I'll try here....
What I don't think I have ever seen is a "template" that describes what the minimum rear "tail" needs to look like to achieve attached flow. This shape is NOT ideal relative to drag, but should have much less drag than say a flat rear like a semi trailer, or even a sphere. We see this over and over, less than ideal shapes making good aero numbers. From the Dryden van, to Trailer Tails, to Joe Schmoe's kammback, to the latest hybrid car, etc. We hear a lot about attached flow and tuft testing here as being a reasonable metric. Just what shape do we need to get that? (And just how good is it?)
|