Hi,
DS aifoils from Dirk Pflug
""The DP-DS-airfoils are made for extreme top speed DS-sessions (Re =
1.000.000 - 2.000.000. They start to run at a speed of 40 m/sec or more.
They are thick so that itīs easier to build a rigid wing and dam fast.
If you will use them for a normal F3B or F3F soarer you will be
disappointed. The design has a much longer laminar flow than the DS-19
which is used by Brian McLean's Extreme. This should lead to a
remarkable higher top DS-speed. The laminar bucket is for the most of
the airfoils between Cl = 0.15 and 0.6 and therefore in the most used
lift regions what concerns DS."
see it on http://tracfoil.free.fr/airfoils/d.htm
J-C E
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