jbhart(at)onlyinternet.ne
Guest
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 Posted: Thu Jul 26, 2012 1:19 pm Post subject: New Firestar II owner - question about elevator oscillatio |
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At 12:00 PM 7/25/12 -0700, you wrote:
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Hello fellow Kolbers,
..................>
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| Quote: | I dialed her in with rudder and aileron trim tabs and she'll fly straight
as an arrow, hands off, in calm conditions. But when she gets bounced
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around in light turbulence, the elevator will occasionally begin to
oscillate if I don't keep a firm grip on the stick. It starts slowly and
will increase gradually, but I can easily stop it by changing airspeed or
pitch. I had a former Firestar pilot and multiple airplane builder fly with
me in his Rans to watch and he said the boom tube began flexing - that's not
good. The immediate solution has been to never let go of the stick.
Eric,
Pitch stability is much like a pendulum of a clock, in that the greater the
distance the vertical cg is below the wing and the larger the mass (weight
of the aircraft) the more stable the aircraft is in pitch. Each plane will
seek to oscillate in pitch at its own natural frequency. As the vertical cg
moves forward it puts more load on the nose and this causes the nose to
drop. As the speed builds and the cg moves toward the rear more lift is
generated and the nose will rise, etc.
If your boom tube to cage connection is flexing, I would check out cage and
boom tube integrity with in the cage.
Pitch stability can be aggravated and corrected by stick input.
Jack B. Hart FF004
Winchester, IN
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