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Old 01-27-2016, 12:55 PM   #1
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Default APR AOA question

So I finished installing my APR GTC-200 five seconds before Singular came out with their new wing set-up...oh well. Anyway, so the wing is currently set at 0 deg., read with a digital level at the center of the wing. I am preparing to install the proper Gurney Flap for the 60" wing (they have 2 different GTC-200 "Flaps" and they are NOT interchangeable, by the way).
After I install the flap do I readjust the wing to 0 deg with the level on top of the gurney flap for ) deg AOA or do I somehow need to compensate for the height of the Flap and leave it out of the equation when determining AOA?
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Old 01-27-2016, 01:10 PM   #2
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First, with the GTC-200, AOA is measured as a flat line from the front edge to the rear edge. The center of the wing will be sloped down towards the back of the car at 0*AOA.

I would set the wing at 0*AOA with the digital level laid across the front/rear edges, then install the Gurney flap, then remeasure the new angle with the level laid across the front edge and the Gurney flap. Make a note of the difference, then use that data to measure AOA changes in the future.
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Old 01-27-2016, 01:50 PM   #3
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Originally Posted by Savington View Post
First, with the GTC-200, AOA is measured as a flat line from the front edge to the rear edge. The center of the wing will be sloped down towards the back of the car at 0*AOA.

I would set the wing at 0*AOA with the digital level laid across the front/rear edges, then install the Gurney flap, then remeasure the new angle with the level laid across the front edge and the Gurney flap. Make a note of the difference, then use that data to measure AOA changes in the future.
So if I were to set the wing to 0*, And then set the top edge of the Singular end plates to 0*, I should in theory be able to read the AOA from the top of the endplates with or without the Gurney flap. Basically, the AOA ( at O*) of the wing remains the same with or without the Flap?
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Old 01-27-2016, 02:22 PM   #4
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Quote:
Originally Posted by joeereid View Post
So if I were to set the wing to 0*, And then set the top edge of the Singular end plates to 0*, I should in theory be able to read the AOA from the top of the endplates with or without the Gurney flap. Basically, the AOA ( at O*) of the wing remains the same with or without the Flap?
All above is correct... But:
The Singular endplates are angle-adjustable so that their relation to the airflow can remain the same regardless of the wing's aoa. If you follow the angle setup instructions that come with the endplates, you'll see that it says to set the wing angle first, then set the forward edge of the endplate to vertical using a level. The forward edge is your reference point, because the top edge is not intended to be horizontal.
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Old 01-27-2016, 04:17 PM   #5
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Got it...so read instructions....go figure.
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