 Strain gage for, measuring downforce |
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| Randal |
 Apr 27 2009, 02:23 PM
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#21
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Advanced Member  Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750  |
Anyone know of a strain gage that measures in lbs or kg's that I can use to measure the downforce of my new rear spoiler. I plan on mounting it underneath the truck lid between the lid and the fiberglass frame. Like where the arrows are pointing:
 I figure if I can find something that reads the downward force I can just set it up with a video camera pointing at the gage, drive down the freeway. with the car on the trailer and get some readings. |
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| type11969 |
Apr 29 2009, 09:10 PM
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#22
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Senior Member Group: Members Posts: 1,231 Joined: 2-December 03 From: Collingswood, NJ Member No.: 1,410 Region Association: North East States |
I would think that you would want two strain gauges 90 degrees out from the leading and trailing edges too . . . unless you think you can assume that the wing is rigid enough that it is not flexing in at the center and causing the uprights to bow in towards each other as well.
Even with just 4 strain gauges you are gonna need a datalogger though. Load cells could definitely work, but they would have to be directly in the load path which makes implementation a little tricky. |
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| jd74914 |
Apr 29 2009, 10:31 PM
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#23
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
QUOTE(type11969 @ Apr 29 2009, 10:10 PM)  I would think that you would want two strain gauges 90 degrees out from the leading and trailing edges too . . . unless you think you can assume that the wing is rigid enough that it is not flexing in at the center and causing the uprights to bow in towards each other as well. Even with just 4 strain gauges you are gonna need a datalogger though. Load cells could definitely work, but they would have to be directly in the load path which makes implementation a little tricky. (IMG:style_emoticons/default/agree.gif) Having done a bunch of stuff with strain gauges lately (and had some friends doing a lot of stuff with load cells), the data acquisition would definitely be the tough part for most wings. They way your spoiler is set up is not really conducive for either of those methods since it is more like a ducktail IIRC. IMHO you're better off driving the thing and seeing what it feels like. That is, unless you can get good CFD data. (IMG:style_emoticons/default/smile.gif) |
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Posts in this topic
Randal Strain gage for Apr 27 2009, 02:23 PM
underthetire http://www.omega.com/pressure/psc.html Apr 27 2009, 02:32 PM
Randal
http://www.omega.com/pressure/psc.html
Very ve... Apr 27 2009, 04:57 PM underthetire
[quote name='underthetire' post='1162867' date='A... Apr 27 2009, 05:06 PM 6freak seems to me if it was on the trailer it would not ... Apr 27 2009, 03:01 PM Randal
seems to me if it was on the trailer it would not... Apr 27 2009, 03:22 PM J P Stein A load cell wold be what you need....2 actually ..... Apr 27 2009, 05:46 PM type11969 I would think that in order to get decent readings... Apr 27 2009, 09:06 PM Randal
I would think that in order to get decent reading... Apr 27 2009, 10:14 PM J P Stein
But if at 45mph it works and I start seeing more ... Apr 28 2009, 07:42 AM 6freak I agree with the 30mph statement ...and its probab... Apr 28 2009, 08:09 AM J P Stein
I agree with the 30mph statement ...and its proba... Apr 28 2009, 05:04 PM Joe Ricard And that's why diffusers are not legal for mos... Apr 29 2009, 05:12 AM john rogers Why not a "sucker car" like the one that... Apr 29 2009, 01:33 PM Randal
Why not a "sucker car" like the one tha... Apr 29 2009, 02:33 PM J P Stein Just my opinion, of course, but the load cells cou... Apr 29 2009, 06:54 PM Randal
Just my opinion, of course, but the load cells co... Apr 29 2009, 07:02 PM J P Stein At the National Tour 2007 first day IIRC he was 2 ... Apr 29 2009, 08:30 PM YksKrad Thought I'd toss my two cents in...
If your u... Apr 29 2009, 08:47 PM john rogers One way to make a "sucker car" that the ... Apr 29 2009, 09:35 PM john rogers I think most race cars use a type of potentiometer... Apr 29 2009, 11:41 PM |
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