On Friday, September 5, 2003, at 03:12 pm, Martin Spott wrote:
3.) I know, you should not employ the flaps at 200 kts ....
But if you do so, the aircraft climbs like attached to a high
speed elevator :-)
I've been flying the Fokker 100 quite a bit, and I've noticed similar instabilities. Roughly (I am not a pilot)
- very rapid control response, especially on the roll axis). This sometimes extends to a 'snap' condition where I command an aileron reversal (okay, I just pull my joystick to the other side), and there is a very prolonged period with no response (for example, 8 or 10 seconds, usually continuing the previous roll command) until the roll suddenly flips over.
- a similar elevator effect to that martin described, when deploying the flaps at high speeds
- very odd high pitch angle behavior ... I can't really describe it, alas. It seems like way too much lift is getting developed at high angles of attack, without a corresponding increase in drag to slow the aircraft.
Essentially, the aircraft flies pretty well (if a bit twitchy) providing you stick to a 'good' flight regime, but handling deteriorates exponentially when I go even moderately beyond it. I'm aware that part of this may be running 'past the end of the data' in JSBsim, but other models do not seem to have these problems. Can this be alleviated by tuning the last data point for various coefficients, which I assume is what JSBsim extrapolates from?
(I was about to say the 747 is much more forgiving of my 80-degree banks, but of course, it uses YASim).
Anyway, aside from the nit-picking, it's a lovely plane, at least until we get an ERJ ;-)
James
-- There is a very fine line between 'hobby' and 'mental illness'
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