Hi Heiko
> The real 737-300 is known to have to use of Mach trim at speed above Mach
> 0.61.
> I wonder if the behaviour I noticed is the same like the real one- if so,
> many thanks to David Culp!:-) And if so, how to make a Mach Trim?
Yes that is correct I have just been reading my old 707 notes and the mach trim
system moves the horizontal stabilizer to correct
for what is called mach tuck.This system only operats when the AUTOPILOT is NOT
ENGAGED.On the 707 they say only above
0.8 mach.This is one reason why FG needs a stabilizer trim system.But I don't
know if it can't be implimented in the FDM after all it is just another force
at a distance.It is no different to the wing except that its lift is negitive
that is down.But if the FDM can
calculate lift for varing degree's of pitch I see no reason why you can't do
the same for the stabilizer.
>
If David does not reply to this I will mention it to him next time I am talking
to him.
Cheers
Innis
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