[Land-speed] Putting a #2H fine point on Jo Codding'spin

Glen Barrett speedtimer at beyondbb.com
Sun Sep 9 09:56:30 MDT 2007


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 at cox.net>
To: "'land-speed-digest'" <land-speed at 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 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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