Quote:
Originally Posted by Snax
Before reading further in the thread, guessing #2, and potentially #1.
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Post read: Having no idea that they left the bottom basically flat, makes sense all around to me.
The Cambridge car crashing also makes a lot of sense. A crosswind against that profile at speed clearly lifted the rear while creating significant yaw force.
I think one way to address that issue without actually changing the form of the car would be to have 4-wheel steering, allowing the car to crab down the road dynamically with wind gusts. That would obviously only work to a point and is probably completely impractical in terms of lane keeping though.
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As a full-scale vehicle, the additional mass would be beneficial.
Ford's 1985 Probe-V concept of Cd 0.137 incorporated a small dorsal appendage behind the backlight to address center-of-pressure issues, and Ford claimed no problems with directional stability at speed.
NASCAR and Bonneville cars which become airborne typically lose traction and get sideways, becoming a crude airfoil in the process.
1991 Corvettes require 221-mph. Racing Beat's 1992 RX-7 Bonneville needed over 240-mph to get ten-feet into the air. The crash of the HONDATA was sort of the same story.