You keep quoting the summary as if it was the only and complete assessment, but it is not. The paragraph dealing with stability as such already gives a more detailed description, that being in general agreement with the summary, but more specific in that "The stability was essentially neutral in all flap-up, power-on conditions of flight except at low speeds, where some rearward motion of the stick occurred." And if we look for further detail on behaviour in accelerated flight, we find "the small static longitudinal stability of the Spitfire" I quoted. And this is proven by stick travel and stick force gradients, for anyone to see.
This doesn't change the fact that NACA found the plane neutral with power off and unstable with flaps down, but this is of no interested in power on accelerated flight.
If you want to sell instability to me, or anyone else who's got a good understanding of the matter, you'll need to explain how both of the above gradients can be positive in an unstable aircraft and how it was possible to fly the smooth stick fixed turns as shown in figures 17 and 18. Repeating the summary yet another time will not do the trick.
I think there's no point in submitting anything to the bugtracker before this has been clarified.
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07-28-2012, 01:03 PM
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