Strain gage for, measuring downforce |
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Strain gage for, measuring downforce |
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. |
john rogers |
Apr 29 2009, 11:41 PM
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#22
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
I think most race cars use a type of potentiometer on each strut (or shock) and feed the movement into data recorders. They measure on a flat surface like the front straight at Willow Springs to zero and then add wings, spoilers, etc at repeat to see how much compression there is at the same speed at the same place on the track. This method has been used since 1969 when Chevy came out with the Z28 Camaro and had the little duck tail and a chin spoiler (I had a dark green one with both) and made all sorts of wild claims about them. One of the magazines tested them and found that the rear spoiler did nothing at any speed (as our short one does) but the chin spoiler did give measuable down force at 130 MPH which tops for a 4.10 geared Z28 at the time.
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