> bug buildup on [Martin Hollmann's blended 64212 airfoil ;
> 30% laminar flow on top and 70% laminar flow] resulted in
> an increased stall speed of about 15 knots.

I'm confused, if vortex generators make a turbulent layer
that stays attached to the wing longer, there by *lowering*
ones stall speed, how is the above true?

I do know the slightest frost on the leading edge of a LNC4
results in 7kts loss of cruse speed and very thin electric
ice boots [or LE tape] eats 5kts on the same plane. Having
never flown without at least one of the above, I had always
assumed my stalls were lower than a clean wing.

I'm confused..

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Utopian Maturity: Eternity, Liberty, Equality and now Fraternity & Altruism.