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Single/Double-Skin Hybrid KF Soft Kite

There is a hybrid soft-wing concept-space between a full parafoil, and a single-skin kite; based on Kline-Fogelman (KF) airfoils, which incorporate backward-facing steps. Its been gradually confirmed, despite skeptics, that select versions do in fact enhance performance (RC modelers have not doubted). A particular KF variant of interest to kite wing design, the KFm-1, has a section like a conventional foil, but with a step mid-chord, on the underside.

To make such a wing, select a high AR COTS parafoil and add a single-skin aft "skirt" to extend the TE, doubling the area. Rig new D-lines to the new TE. The neatest way to increase angle of attack is to draw the TE center down into a sort of keel, with the wingtips remaining relatively washed-out; otherwise, a scalloped edge results.

The KF Soft Kite may be a superior trade-off, a synergism even, between the luff-resistant double-skin parafoil against the lighter, simpler, cheaper single-skin wing.

Comment and development of this topic will be occurring here.       
All, send notes, links, drawings, papers, videos, plans, safety-critical findings, and photographs!

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