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Flat Alum. Plate
I agree 1/4'' plate aluminum with a break and a backing plate,and cut to the profile of the bottom side of the wing...nice! I sure his water jet machine is in the shop! jig saw.
An race engineer said to me a rear wing of good design doesn't start to work until "about 60 mph) then the math takes placement/ surface area/shape /etc. Plus the GURNEY flap.
I might go with flat end cap and a interchangeable GURNEY flap.
NICE job!
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