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A flying wing shape

This flying wing shape seems to yield interesting results. Flight direction is towards the top of the page. The wing is flat with the two ouside triangles slightly bend upwards. The center of gravity is located on the black dot:

The prototype was made out of an A4 sheet of paper. In the drawing below, the slightly darker surface is made of two layers of paper glued together. The dark front part is made of many layers of tightly folded and glued paper on the upper side:

A view from the front:

Wing span is 295 mm, chord is 68 mm and weight is 5 grams.

The idea behind this shape was that the two outside triangles would serve to control the yaw. At first I thought to use two vertical little surfaces, like this:

Suppose the glider yaws rightwards. The left surface will brake more while the right surface brakes less. This is supposed to make the wing yaw back leftwards:

I tried out this system with paper gliders and got stable flights when lifting only slightly the outside surfaces. I finally converged to the shape presented in this text, which has a good flight yield.

I don't know exactly how the air moves around this wing shape. I believe one reason for the finesse is the upwards triangles decrease the lift on the outside parts of the wing. Maybe this mimics the shape of wing tip salmons or seagull wings, like my previous glider.

I don't know if this wing shape can be made stable enough to build a serious airplane. Anyway it seems interesting for RC flight. When lifting more upwards the two triangles, the wing keeps a stable flight, yet it is braked and looses altitude quickly. When lifting a little bit only one triangle, the wing is made to turn.

Eric Brasseur  -  February 6 2005