Newsgroups: rec.aviation.student,rec.aviation.piloting
Path: news.jprc.com!dca1-feed2.news.digex.net!dca1-hub1.news.digex.net!digex!netnews.com!ix.netcom.com!mmallory
From: mmallory@netcom.com (Mark Mallory)
Subject: Re: 17 misconceptions - The Flight Test
Message-ID: <mmalloryF4CMoJ.43C@netcom.com>
Followup-To: rec.aviation.student,rec.aviation.piloting
Organization: ICGNetcom
X-Newsreader: TIN [version 1.2 PL2]
References: <73slvn$5b2$1@news.monmouth.com> <VA.000006ca.003319ce@hbmltd>
Date: Tue, 22 Dec 1998 04:19:31 GMT
Lines: 36
Sender: mmallory@netcom8.netcom.com
Xref: news.jprc.com rec.aviation.student:42652 rec.aviation.piloting:30323

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
References: <73slvn$5b2$1@news.monmouth.com> <VA.000006ca.003319ce@hbmltd>
Organization: ICGNetcom
Distribution: 

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.
