[Land-speed] Ballast.... and Hotels......

[neil at dbelltech.com]

Mayf;

Here's what I'd do-- calculate the shear load (F) that would be created by a
crash of perhaps 30 Gs (A) on the weight (M) that you're bolting down. (F =
M * A) Divide this shear load by the number of bolts (use as many as you
can) and then look up the shear strength of various sizes and materials of
bolts.

Whatever you do use large washers under the heads of the bolts as well as
under the nuts where they go through the sheet metal. A strong bolt is only
as safe as the bearing strength of what it's put through.

Add another safety factor to the calculated result if you want to be extra
conservative.

Maybe someone else may have a better idea.....

Regards, Neil   Tucson, AZ

-----Original Message-----
From: land-speed-bounces at autox.team.net
[mailto:land-speed-bounces at autox.team.net] On Behalf Of drmayf
Sent: Friday, January 02, 2009 2:02 PM
To: LSR
Subject: [Land-speed] Ballast.... and Hotels......

Well, time to kick off the new year with a general question regarding 
ballast.  I scanning the rule book I see that it only has to be bolted 
down, preferably to the frame and as low as possible is recommended. So 
what, if any, are general guidelines to screwing weight to the car 
frame? Som many bolts per pound? How many G's is it supposed to resist 
in an upset crash? Heck the motor is only generally screwed to the frame 
wih 4 bolts or so (2 front motor mounts and 2 for the trannyout back).

So what's the rule of thumb for size and number of ballast attachemnts?


Now, are the hotels accepting reservations yet?

mayf
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