Thanks Dan,

I've read qutie a bit in the past about Curtis' patent for the stall
characteristics of the Pitts, quite clever and she is pretty docile upright
or inverted. I must say I especially like the 3,4,5G stalls, lots of warning
and buffet.

Do your DR-107 and 109 have different inverted and upright stall speeds?
Anyway I find it a tad confusing because I would expect the opposite.
Given that in upright flight the top of the top wing is totally clean but
inverted the 'top' of the now bottom wing has the cabanes etc mucking up
the upper surface lift. The bottom wing is pretty much the same inverted
and right side up, except for the spades etc, getting in the way.

Oh well, its a good rainy/windy day thing to puzzle about.

Cheers,

Peter


>Peter,
>I'll have to think about this one for a while. It's probably due to the
>general configuration and interference difference when inverted as opposed to
>upright.
>
>As a note-
>Teh Pitts is a postive stager biplane configuration.
>The forward wing of ALWAYS stalls first, upright or inverted. Think of it as
>a similar situtaion to a canard aircraft. The forward wing must stall first to
>allow the nose to drop (pitch down) after a stall.
>The upper wing (the forward wing) has a different airfoil section which stalls
>at a slightly lower angle of attack than the lower wing (the aft wing).
>
>Dan Rihn


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