[Land-speed] Putting a #2H fine point on Jo Codding'spin
ifixmgs at cox.net
ifixmgs at cox.net
Sat Sep 8 18:59:58 MDT 2007
I agree that had the car simply swapped ends, even after backing off the throttle, with the brake handle hauled tight at speed, the leading shoes would be on the wrong side of the drums to be effective - most of us have re-positioned reversed shoe sets over the years to "magically" restore braking power...
With the throttle lifted, in neutral and/or clutch engaged, I would think that the CoF between salt and tires is low enough to lock them up until it swaps ends back to nose first, reloading the shoes hard against the drums (providing the lever is hauled tight). Theres a good chance that a hard tug on the brakes would induce a Hollywood spin regardless of which end is pointing wherever...
I'd also speculate that once the wheels were locked up, with all excess slack out of the cable, when the tail points in the direction of forward travel again, the force holding the shoes locked will outweigh the negative torque against the shoe set. In the last few frames right after the timing tower pass, the car swapped ends one last time right after the tires squeal (for the first time) and it looks like the brakes were set.
---- neil at dbelltech.com wrote:
> They must not be disc brakes then. Maybe a drum setup with leading shoes;
> those become trailing shoes in reverse and need lots higher brake line
> pressure. It would be interesting to know the details.
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