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> How flexible do you think a stock, trailing arm is
ChrisFoley
post Dec 16 2005, 06:19 PM
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Specifically I am looking for rotational stiffness (ie. twist) of the trailing arm due to the tire contact patch resisting sideways sliding of the car. I'm only interested in forces greater than 1G during cornering.
I already know what happens but go ahead and take a guess. (IMG:style_emoticons/default/biggrin.gif)
I'll post pictures of my test fixture shortly.
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ppickerell
post Dec 16 2005, 07:41 PM
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Chris,
Do you intend to test before and after boxing?
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Posts in this topic
Racer Chris   How flexible do you think a stock, trailing arm is   Dec 16 2005, 06:19 PM
TimT   Chris the trailing arm appears to be a pretty sto...   Dec 16 2005, 06:25 PM
J P Stein   WAG: 1 deg @500 lbs. I'm assuming you're ...   Dec 16 2005, 06:26 PM
airsix   What exactly do you mean by "1G". I'm sure you...   Dec 16 2005, 07:09 PM
ppickerell   Chris, Do you intend to test before and after boxi...   Dec 16 2005, 07:41 PM
Dave_Darling   I'm guessing that most of the flex happens in ...   Dec 16 2005, 07:54 PM
spare time toys   My guess is it has flex designed into it at an amo...   Dec 16 2005, 08:08 PM
Racer Chris   So far JP is the only one really on the right trac...   Dec 16 2005, 08:24 PM
Racer Chris   Then I attached a 5ft piece of structural tubing t...   Dec 16 2005, 08:26 PM
Racer Chris   by putting a 200lb man's weight at the end of ...   Dec 16 2005, 08:32 PM
Racer Chris   I had a friend sit on the end of the tube and saw ...   Dec 16 2005, 08:34 PM
Racer Chris   I have several more tests planned already. 1) meas...   Dec 16 2005, 08:40 PM
TimT   Put the level on the trailing arm, not the lever ...   Dec 16 2005, 08:41 PM
TimT   and yes I see the angle you have welded on the bo...   Dec 16 2005, 08:42 PM
SpecialK   ....go on.... http://www.914wor...   Dec 16 2005, 08:43 PM
andys   Chris, This is exactly the kind of testing requir...   Dec 16 2005, 08:57 PM
goose2   If you mount the level in various locations on the...   Dec 16 2005, 09:06 PM
TimT     Dec 16 2005, 09:12 PM
rick 918-S   Put that level at the in board mounting in the dir...   Dec 16 2005, 09:21 PM
URY914   Chris, This is what the pro teams call "off season...   Dec 16 2005, 09:21 PM
Racer Chris   I am confident that wouldn't change the test ...   Dec 16 2005, 09:23 PM
r_towle   and you told me you were busy... ht...   Dec 16 2005, 09:34 PM
Racer Chris   My research is primarily aimed at Production race...   Dec 16 2005, 09:36 PM
Racer Chris   <...   Dec 16 2005, 09:38 PM
rick 918-S   There is no way that box would flex before that mi...   Dec 16 2005, 09:38 PM
TimT  
  Dec 16 2005, 09:41 PM
Racer Chris   One more goal I have is to possibly be able to twe...   Dec 16 2005, 09:44 PM
J P Stein     Dec 16 2005, 10:34 PM
TimT  
  Dec 16 2005, 10:35 PM
URY914   OK, that my $.02 worth, I'm going to bed....   Dec 16 2005, 10:38 PM
TimT   great thread.... I love this stuff.. Im out also....   Dec 16 2005, 10:41 PM
Racer Chris     Dec 16 2005, 10:49 PM
McMark   I can't wait to see if my thoughts about stiff...   Dec 16 2005, 11:22 PM
brant     Dec 17 2005, 12:04 AM
Mueller   nice work Chris.....   Dec 17 2005, 12:45 AM
Racer Chris   Mike, I have a dial indicator and mag base but not...   Dec 17 2005, 06:36 AM
9146986   I saw one of the 1997 GT1 chassis on a deflection ...   Dec 17 2005, 09:00 AM
Brett W   Now you are seeing the reason why many professiona...   Dec 17 2005, 09:13 AM
Thorshammer   I have'nt seen this thread until this morning,...   Dec 17 2005, 10:49 AM
groot   http://www.914world....   Dec 17 2005, 01:15 PM
ChicagoChris   This is great and even though he hasn’t yet done...   Dec 17 2005, 02:04 PM
bondo   Am I correct in assuming that 1 degree of deflecti...   Dec 17 2005, 02:58 PM
Racer Chris   OK I did some more experiments this morning. The f...   Dec 17 2005, 03:22 PM
Racer Chris   You will never load the suspension enough to reac...   Dec 17 2005, 03:27 PM
jhadler   Great project Chris! I'm really intereste...   Dec 17 2005, 03:28 PM
Racer Chris   http://www.914world.com/bbs2/h...   Dec 17 2005, 05:12 PM
Racer Chris   The amount of wheel spacers you use is largely du...   Dec 17 2005, 05:16 PM
Racer Chris   http://www...   Dec 17 2005, 05:41 PM
rick 918-S     Dec 17 2005, 06:14 PM
Brett W   OK, you go to all the trouble to fix the flexible ...   Dec 17 2005, 07:37 PM
rick 918-S   http://www.914world.com/bbs2...   Dec 17 2005, 07:53 PM
Dave_Darling   Chris, thank you very much for doing this testing,...   Dec 17 2005, 08:14 PM
Bleyseng   Yes, its interesting but... I like Muellers idea f...   Dec 17 2005, 08:18 PM
Mugs914   This is one of the best threads I've seen here...   Dec 17 2005, 09:30 PM
Mugs914   Here's a shot that shows where the tube comes ...   Dec 17 2005, 09:32 PM
Mugs914   Outboard side...   Dec 17 2005, 09:33 PM
McMark   That arm has an option for increased shock travel?...   Dec 17 2005, 10:04 PM
Aaron Cox     Dec 17 2005, 10:07 PM
rick 918-S   Oooo! shock travel= cool! <...   Dec 18 2005, 05:31 AM
Racer Chris   <...   Dec 18 2005, 05:33 AM
ein 6er   good stuff here guys!!!   Dec 18 2005, 09:18 AM
DJsRepS   Woah I replied to Tim's post before seing 5 pa...   Dec 18 2005, 09:20 AM
Brett W   That is Andy McNeal, I believe. That car is super...   Dec 18 2005, 09:43 AM
ein 6er   <...   Dec 18 2005, 10:14 AM
Mueller   strange idea to see where the twisting starts: co...   Dec 18 2005, 11:35 AM
r_towle   so, is carbon fiber an option here.. Can it be ef...   Dec 19 2005, 09:08 PM
Racer Chris   <...   Dec 20 2005, 05:29 AM
Bleyseng   http://www.914world.com/bbs2/...   Dec 20 2005, 08:23 AM
Racer Chris   Here's a diagram of what I intend to try next....   Dec 21 2005, 09:07 AM
r_towle   Chris, this looks great...though I would not trust...   Dec 21 2005, 09:13 AM
mrdezyne   http://www.914world.com/bbs2...   Dec 23 2005, 03:47 PM
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