A question about Moff foils....

   Downward-facing winglets already in action at the worlds - this is Ben Paton comparing his foil to world champion Bora Gulari's.

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Mark Jardine Send Private Message Find Member's Posts Visit Member's Homepage Admin Group Joined: 12 Mar 04 Location: Milford-on-Sea, United King Online Status: Offline Posts: 1028	Post Options Post Reply Quote Mark Jardine Report Post Quote Reply Topic: A question about Moff foils.... Posted: 07 Nov 13 at 7:42pm
	Downward-facing winglets already in action at the worlds - this is Ben Paton comparing his foil to world champion Bora Gulari's.

Granite Send Private Message Find Member's Posts Visit Member's Homepage Far too distracted from work Joined: 12 May 04 Location: Scotland Online Status: Offline Posts: 476	Post Options Post Reply Quote Granite Report Post Quote Reply Posted: 07 Nov 13 at 11:41pm
	There are scale issues, and flow reigeme issues that complicate things for foils. My understanding of the upward longer winglets on aircraft is that there is a vortex generated at the wing tip. The winglet is positioned so that the part of the vortex that is flowing back towards the aircraft impinges on the winglet. the shape of the end of the wing, together with the shape of the winglet and the toe in angle are all critical to performance. To get that right on the scale of moth foils would be fractions of a mm and fractions of a degree, so tricky to get right. One of the big effects that helps dihedral provide stability is side slip, I don't thinkt he moths side slip in the same way.
	If it doesn't break it's too heavy; if it does it wasn't built right