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candidate for magic airfoil section?

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Starflight

Well-Known Member
Joined
Nov 7, 2010
Messages
86
Location
Saskatchewan..."GO RIDERS"(pride)where's my banjo?
I know the title is 'corny' but after cruising through those hundreds of sections
graciously provided by "krauss", I couldn't help wondering why the 18.3% thick
Gottingen 679 showed such a superior L/D ratio (64.8) when that number is
usually reserved for thinner airfoils. The plotted polars add up (divide that is)
and I know the Rn is low at 100000. Could any of the owners of aerodynamics
programs please run the numbers for me at R=500000, 1million and 1.5million?
The last mentioned number approximates the landing approach speed for typical
ultralights. Are there any stall problems with that section in your opinions? Thanks.
 
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