Chassis Torsional Stiffness, as if we haven't talked about this before

[Faterooski]

Can anyone give me approximate measured torsional rigidities and masses for your chassis? I know people will say that this has been discussed on here before, but I looked and I can't find people's actual measured results. Plenty of suggested guidelines and goals to shoot for, but very few real measured numbers. Past cars are fine, I wouldn't ask someone to give away their top-secret '06 world beaters!
Thanks!

[Faterooski]

Can anyone give me approximate measured torsional rigidities and masses for your chassis? I know people will say that this has been discussed on here before, but I looked and I can't find people's actual measured results. Plenty of suggested guidelines and goals to shoot for, but very few real measured numbers. Past cars are fine, I wouldn't ask someone to give away their top-secret '06 world beaters!
Thanks!

[Draksia]

I think the general number is roughly 10 times your roll stiffness but I will the more explaination to be who can explain better then I.

[jack]

faterooski, stiffness numbers are a lot like dyno numbers, the method used to get the number can have a lot of influence. you cant just take numbers from a bunch of schools and compare them without taking into account many different factors.

they are also like dyno numbers in the sense that simply achieving high number doesnt really matter too much--especially if you dont want one. instead, decide what overall goals you want for your car, and see where that puts you for a chassis
stiffness.

[jack]

i just read that and realized i didnt make my point:

the point is, dont worry about what other schools have. just do the best you can on your car given your constraints and goals.

[Faterooski]

Well, normally I wouldn't worry other other teams' values, but I need this info for a homework assignment and I'm having a hard time finding any info.

I know I'm going to shoot for around 2000 ft*lbs/degree and 65 lbs overall. Sounds pretty reasonable, doesn't it?

[jack]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Faterooski:
Well, normally I wouldn't worry other other teams' values, but I need this info for a homework assignment and I'm having a hard time finding any info. </div></BLOCKQUOTE>

dont people learn how to make stuff up in college anymore?? http://fsae.com/groupee_common/emoticons/icon_razz.gif http://fsae.com/groupee_common/emoticons/icon_wink.gif

[Erich Ohlde]

Seeing as how i've claimed this for wheel to wheel stiffness, I have been informed by my team that this was only measured front wheel to rear of chassis. 6500ftlbs/deg with a chassis weight of 44lbs

[Storbeck]

Would anybody be interested in setting up an unoficial volunteer standardized torsional stiffness tester at competition, at some team's pit area. Probably wouldn't be too hard to set up, could be interesting.

Unoficial prize for stiffest, or closest guess or something, possibly beer...

Just throwing it out there.

[DaveC]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> All electrical components and wiring harnesses depend on proper circuit functioning, which is the transmission of charged ions by retention of the visible spectral manifestation known as "smoke". Smoke is the thing that makes electrical circuits work. Don't be fooled by scientists and engineers talking about excited electrons and the like. Smoke is the key to all things electrical </div></BLOCKQUOTE>


Oh, so THATS why when you "let the smoke out" of electronics they dont work any more.

[Erich Ohlde]

pretty much http://fsae.com/groupee_common/emoticons/icon_smile.gif thats why heat shrink is so nice. you can get it air tight and the smoke cant get out