Mark Burton
Joined: 10 Jan 2006
Posts: 74
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 Posted: Sat Jun 23, 2007 9:30 am Post subject: Tailplane flutter & trim |
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Following on from my last post where I suggested that if tailplane flutter was likely to occur then surely it would have been reported before now given the fleet hours. I am not aware of any cases, are you?
So assuming for the moment that tailplane flutter is unlikely to occur when flying at VNE even when some slop is present in the tailplane system, it begs the question: why isn't it fluttering?
Well, I don't know about everyone else but when I do the VNE run the trim is set to a much lower speed and, consequently, I have to push a lot on the stick to make it go downhill. All that push force is being transmitted to the tailplanes and so any slop (hypothetical slop, of course!) in the system is taken up.
However, if while at VNE I was so foolish as to start trimming forward, the required push force would reduce until it became zero (assuming the trimmer has enough range) and, at that point, the tailplanes could, potentially, start to flutter due to the slop no longer being taken up by the stick force.
I wonder if a Europa has ever been trimmed out at VNE? Did the factory do that in their test flying?
I am not going to try the experiment to see what happens.
Perhaps those of you who understand these issues would care to comment?
Mark
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