land-speed
[Top] [All Lists]

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

To: <drmayf@mayfco.com>
Subject: Re: [Land-speed] Ballast.... and Hotels......
From: <neil@dbelltech.com>
Date: Fri, 2 Jan 2009 15:42:48 -0700
Mayf;

The "30 Gs" is a WAG-- if an impact switch is triggered at 10 to 12 Gs, it
makes me think there may be higher G crashes than that. Just a guess,
though.

Regards, Neil   Tucson, AZ


-----Original Message-----
From: drmayf [mailto:drmayf@mayfco.com] 
Sent: Friday, January 02, 2009 3:36 PM
To: neil@dbelltech.com
Cc: 'LSR'
Subject: Re: [Land-speed] Ballast.... and Hotels......

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
>_______________________________________________
>Support Team.Net  http://www.team.net/donate.html
>
>Land-speed mailing list
>
>You are subscribed as neil@dbelltech.com
>
>http://autox.team.net/mailman/listinfo/land-speed
_______________________________________________
Support Team.Net  http://www.team.net/donate.html

Land-speed mailing list


http://autox.team.net/mailman/listinfo/land-speed

<Prev in Thread] Current Thread [Next in Thread>