Quote:
Originally Posted by JulianEdgar
In that case you're confused, I think.
Hucho's reference to bistable flow (in your words - 28-degree-to 32-degree range, where the separation line jumps between a fastback and squareback wake pattern) is nothing to do with boat-tailing, it's to do with the vertical angle of the rear hatch.
The lack of separation edge is obviously causing the feathery side separation - nothing to do with hatchback versus squareback flow patterns.
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Bistable ( Hucho's word ) would not be limited to the rear slant angle.
Separation and re-attachment, or the lack thereof may occur anywhere in the aft-body.
While it's inefficiency may be absorbed within the confines of the specification of the vehicle, drag-wise, it may turn out to be objectionable, noise-wise, requiring a change to body tooling in order for noise abatement, something enforced in the USA.