List:       flightgear-flightmodel
Subject:    [Flightgear-flightmodel] Regarding forces acting on the 747-200
From:       Supem Samarasiri <supems () gmail ! com>
Date:       2009-01-19 14:27:45
Message-ID: 331e656e0901190615g14107e1am88db972562010828 () mail ! gmail ! com
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Hi,

I have some problems regarding the aerodynamic forces acting on the 747-200
aircraft(JSBsim) which is available for download at the flight gear site.

During the take off run when I keep an eye on the aero-forces in the X
direction I observe a sign change in the force in the X direction, with no
flaps during
 takeoff run(still on the runway below 150kn) when I pull the control
column(deflecting elevators up) I observed the aero force change from minus
to plus
and when I push the york it changes from minus to plus. With 20 flaps during
takeoff run when I pull the control column I see that the drag in X
direction
decrease and when I push it the drag(aero force) in X direction(Obviously
the drag is in X direction :D)  increases. I can observe the corresponding
increase
& decrease in acceleration when I pull and push the control column when I
keep an eye on the airspeed indicator also.

Can someone tell me whether it is normal and let me know how this happens or
is it a problem(BUG :D) in the 747-200. And by the way can someone tell me
about the trim setting that must be used when taking off this jumbo at MTOW
and the aerodynamics with regard to elevator trim and elevator deflections.



Thank You,

Supem(supems@gmail.com)

[Attachment #5 (text/html)]

Hi,<br><br>I have some problems regarding the aerodynamic forces acting on the \
747-200 aircraft(JSBsim) which is available for download at the flight gear \
site.<br><br>During the take off run when I keep an eye on the aero-forces in the X \
direction I observe a sign change in the force in the X direction, with no flaps \
during<br> &nbsp;takeoff run(still on the runway below 150kn) when I pull the control \
column(deflecting elevators up) I observed the aero force change from minus to plus \
<br>and when I push the york it changes from minus to plus. With 20 flaps during \
takeoff run when I pull the control column I see that the drag in X direction <br> \
decrease and when I push it the drag(aero force) in X direction(Obviously the drag is \
in X direction :D)&nbsp; increases. I can observe the corresponding increase<br>&amp; \
decrease in acceleration when I pull and push the control column when I keep an eye \
on the airspeed indicator also.<br> <br>Can someone tell me whether it is normal and \
let me know how this happens or is it a problem(BUG :D) in the 747-200. And by the \
way can someone tell me<br>about the trim setting that must be used when taking off \
this jumbo at MTOW and the aerodynamics with regard to elevator trim and elevator \
deflections.<br> <br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;& \
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb \
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp \
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nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
Thank You,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n \
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs \
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
Supem(<a href="mailto:supems@gmail.com">supems@gmail.com</a>)<br> <br><br>



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