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kimon
Topic Author
Posts: 252
Joined: Mon Nov 23, 2009 2:37 pm

Auto T/O

Tue Feb 23, 2010 10:28 pm

Why no auto T/O?
How would it work?The opposite of an autoland?
Many thanks!
I do not really dig the following but if this helps:
I have had no problem engaging HDG HLD, HDG SEL, V/S and FLCH on a 747-400 on the ground. Theoretically, you could use FLCH for takeoff, if it wasn't so risky doing so (I believe someone has already tried this, anyway, in real life and got away with it).
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Starlionblue
Posts: 20751
Joined: Fri Feb 27, 2004 9:54 pm

RE: Auto T/O

Tue Feb 23, 2010 11:40 pm

Reverse the question. Why would you need auto T/O?

Autolands exist because the autopilots can follow a glidepath very precisely without visual cues, even in severe winds. When taking off, the runway is visible in all but the thickest fog so there is no need for such technology.

There are no technical limitations to auto take-off. UAVs like Global Hawk do it all the time. There is, however, no motive to spend the money to develop the technology for airliners, given that the pilots are going to be there anyway.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
tdscanuck
Posts: 8573
Joined: Wed Jan 11, 2006 7:25 am

RE: Auto T/O

Wed Feb 24, 2010 1:02 am

Quoting kimon (Thread starter):
I have had no problem engaging HDG HLD, HDG SEL, V/S and FLCH on a 747-400 on the ground. Theoretically, you could use FLCH for takeoff, if it wasn't so risky doing so

It might work, but it would be a complete kludge. The FLCH mode isn't designed, at all, for rotation or maneuvering at those kinds of speeds and altitudes.

Tom.
 
kimon
Topic Author
Posts: 252
Joined: Mon Nov 23, 2009 2:37 pm

RE: Auto T/O

Wed Feb 24, 2010 8:45 am

Ross Aimer writes:
Auto T/O
I guess because too many things happen during T/O. Speed is constantly changing so is the attitude, and configuration changes that the auto flight cannot handle.
I have used HUD on 737-800. Great device. you can do a CATIIIC Approach hand flown with
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