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Old 08-27-2014, 07:45 PM   #144 (permalink)
aerohead
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software

Quote:
Originally Posted by godscountry View Post
Allert Jacobs claims stability in crosswinds up to 40 mph,is that a misprint and if not,whats going on here.I have read he has improved his mileage from around 130 to a best 221 with the addition of a manual clutch,sprocket change and a 88 lb body and hardware.If true,what makes his relatively short wheelbase partial streamliner so stable and could some of these designs be tested in a computer program? Could you test crosswind stability in a software program?
In bluff-body,3D,automotive work,CFD is okay for pick-and-shovel work,but the automakers always do a full-scale mockup for actual tunnel testing and aero tuning.
They can do an actual velocity/pressure profiles,locate the center-of-pressure at varying degrees of yaw,as well as lift/drag/pitch,and roll moments.
Smoke can reveal trouble spots.
Cal Tech's GALCIT tunnel has been used by racing teams to evaluate fully-enclosed Bonneville streamliner motorcycles.
One might underwrite some graduate studies in the tunnel to test out a design roughed in with CFD.A phone call or email would get you pricing info for tunnel time.
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