A
cut off on a double elliptical? I think you mean a Spitfire tip.
that is an example yes, but more like the Spitfire Mk XIV clip wing
the feature of double ellipticals is that they excite spanwise flow up to the tip. The idea is to balance the work the wing is doing from root to tip. Ordinarily the tips lose efficiency, so sucking air from the body of the wing increases the speed of flow over that section to the tip rebalances effort.
Hence while the shape of the wing has more area at the bottom than the top (technically lowering CE) the efficiency or work done across the span is meant to be equal.
There are pseudo ways of accomplishing almost the same thing using straight and taper sections, but not so elegantly. Really the actual profile might ultimately e a feature of the materials you choose to make it from, I just assumed composite.
the feature of double ellipticals is that they excite spanwise flow up to the tip. The idea is to balance the work the wing is doing from root to tip. Ordinarily the tips lose efficiency, so sucking air from the body of the wing increases the speed of flow over that section to the tip rebalances effort.
Hence while the shape of the wing has more area at the bottom than the top (technically lowering CE) the efficiency or work done across the span is meant to be equal.
There are pseudo ways of accomplishing almost the same thing using straight and taper sections, but not so elegantly. Really the actual profile might ultimately e a feature of the materials you choose to make it from, I just assumed composite.
Part of my dilemma is that with the symmetrical foils I am getting exactly the same lift at the tip.. And when the apparent wind kicks in I am going to get a higher angle of attack at the tip and even more lift.... Raising my CoE
A proa has particular limitations, it cant accept twist, and it must be symmetric.
I wouldn't be trying anything too ambitious on the first wing
I wouldn't be trying anything too ambitious on the first wing
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Posted by: robriley@rocketmail.com
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