Mike,
Not correcting your theory or practice of low-drag flying, just the
Spitfire airfoil part. Spitfires had a NACA 2213 airfoil at the root,
tapering to 9% (2209) near the tip and washed out to keep the elliptical
planform from stalling all at once across the span.
Chris K.
On 3/13/2020 9:51 PM, Mike Stirewalt via KRnet wrote:
Jeff said,
"While many seem to poo-poo the RAF-48 airfoil, mostly for it's unknown
data points, it is a gentle airfoil with plenty of warning for stalls."
That's certainly been my experience. Maybe it's just an OWT but I read
or heard many years ago that it's the same airfoil as the Spitfire.
That's probably a meaningless statement since there were several Mk
Spitfire designs and could easily have had different airfoils . . .
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