I had the best seat to witness the spin from the timing trailer. The
roadster was still under power when it went into the spin. She tried to
correct it but appeared to over correct that is easy to do. She only has a
few rides on the salt and it got away from her
Glen
----- Original Message -----
From: <ifixmgs@cox.net>
To: "'land-speed-digest'" <land-speed@autox.team.net>
Sent: Saturday, September 08, 2007 6:59 PM
Subject: Re: [Land-speed] Putting a #2H fine point on Jo Codding'spin
>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@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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