Theoretical comparison of the flow over a flat delta wing and a rectangular pyramid
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Abstract
Slender-body theory is used to compare the flow over the bottom surface of a flat delta wing at incidence and the delta-like surfaces of a pyramid of rectangular section, interest being focussed on the centre line and on the flow attachment lines where they exist. Pyramids are found which reproduce closely the flow in the neighbourhood of the delta centre line. Other pyramids are found which have the same position of the attachment lines as a delta wing, the approxirnation to the flow being good when the attachment lines are near the centre line but deteriorating as they move outboard.