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Old Oct 11, 2012, 12:34 AM
Mitchell Covell is offline
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China, Guangdong, Shenzhen
Joined Nov 2010
74 Posts
Tests i n v o l v i n g variations i n the step geometry (locat
i o n , size and shape) indicate quite conclusively t h a t the l i f t i s primarily a
leading edge phenomenon which reaches a maximum when the step is not present.
Mhen the stepped airfoil i s turned upside down ( w i t h the step on tup of the
airfoil) there is a marked increase i n both ' i f t and lift/drag ratio b u t these
are s t i l l below the levels f o r conventional airfoils except a t very large
angles of a t t a c k .
Edward Lumsdaine
W i l l i a m S. Johnson
Lynn M. Fletcher
Judith E. Peach, 1974

It should be noted that these tests were carried out for 60,000 <= Re <= 135,000 and probably do not apply to the range of Re numbers associated with the formation of laminar separation bubbles.

We should be more careful about comparing apples and oranges.
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