Wow, 30 g's. Man that is a lot! I bet that no one uses that high a
standard, lol.. I have a 90 pound steel bar that I am gonna moiunt to
my frame.
Thanks for the info!
mayf
neil@dbelltech.com wrote:
>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@autox.team.net
>[mailto:land-speed-bounces@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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