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From: mmallory@netcom.com (Mark Mallory)
Subject: Re: 17 misconceptions - The Flight Test
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Date: Tue, 22 Dec 1998 18:49:36 GMT
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Mark Mallory (mmallory@netcom.com) wrote:
: Dave Mould (davem@airstrip.demon.co.uk) wrote:
: : Exercise:
: : Maintained cruise power and RPM (0 boost 2300RPM).  Trimmed to 80KIS and flew 
: : "hands off" for a while to ensure everything was stable at 80KIS (aircraft 
: : climbing).  Pushed forward to 160KIS, and held it for a while to ensure stable 
: : (heavy forward pressure on the stick, aircraft diving).  Let go of the stick.

: : Result:
: : Nose pitched up rapidly, pulling 2.5g on the meter.  Nose continued to rise to 
: : an angle of around 80 degrees (10deg off vertical).  At this point I took over 
: : as the speed was not high enough to allow it to continue to pitch up without 
: : doing some interesting maneuvers.

: : The g was not nearly as high as in Hilton's experiment or the theory predicts. 
: :  So - what was the difference in my experiment?  The trim tab is conventional, 
: : though is also a balance tab (moves with elevator so as to reduce forces).

: Subject: Re: 17 misconceptions - The Flight Test
: Newsgroups: rec.aviation.student,rec.aviation.piloting
: Followup-To: rec.aviation.student,rec.aviation.piloting
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: Dave Mould (davem@airstrip.demon.co.uk) wrote:
: : The g was not nearly as high as in Hilton's experiment or the theory predicts. 
: :  So - what was the difference in my experiment?  The trim tab is conventional, 
: : though is also a balance tab (moves with elevator so as to reduce forces).


: Suspect that your initial trim setting was affected by power (you said 
: you were *climbing*); the airflow over the horizontal tail resulting in a 
: more *nose-down* trim setting than would otherwise be the case.  Setting 
: the trim in an 80 kt *descent* (reduced or zero power) would result in a 
: more *nose-up* setting, which in turn would result in greater 
: acceleration at the higher speed.
