With Nationals in our rearview mirror (if we had one), we're looking forward to 2012 for another strong showing. Our car is on display in the GRM HQ office here in Holly Hill, Florida, and we've already started a list of things we want to accomplish during the offseason.
First item: a seat insert for Kim, our tech editor's wife. …
I guess this will be in the writeup, but that's heavy enough that I'm guessing it'll need to be fastened to the car and not just held in place by the driver? I wouldn't want my lower legs trying to stop a 68-lb plate attempting to leave the lower seat edgewise in a hard stop...
It's positioned in the car so that it's essentially strapped to your back--and the harnesses are keeping you/it in place. Wouldn't do it for a road racing car, but typical for autocross mod cars.
Would lead not be better? Heavier and can be set lower.
Since the weight is so critical i only mention the slight error in your weight of the plate, Pro-Engineer comes up with 63.675lbs for that size plate with sharp corners.
12x16x1.25 = 67.9 12x16.125x1.25 = 68.45
I don't know the exact envelope that you have to work with... So i just threw that size in there.
Lead
12x12.375x1.25 68.49lbs
You're right, it's more like 16" tall. Weighed 68 pounds on our big postal scale.
Per
Good deal!
I also don't like the idea of the weight "being strapped to your back" in the worse case an accident. Her chest would compress (just break ribs in the best case) So i offer a "simple suggestion" I would take some 90° angle steel and make a slide in plate retainer welded to the chassis (behind the seat?), with a bolt on top to retain it again for the worse case.
Good luck! :)
Good idea--I'll see if I can work that in.
This idea probably won't work for your application, but it is another avenue: ballast tank to fill/drain to give the correct weight.
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