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747/200/300 Stall
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shunti View Drop Down
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Joined: 16 May 2009
Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shunti Quote  Post ReplyReply Direct Link To This Post Topic: 747/200/300 Stall
    Posted: 26 Sep 2011 at 4:16pm
Hi, On reaching aprox 30,000ft whilst climbing using auto pilot climb rate set at 17,000 ftpm, the 747 pitches up at a steep angle then loses speed and goes into a stall, ant one got any ideas to what i may be doing wrong
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Slopey View Drop Down
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Joined: 11 Jun 2008
Points: 8280 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Slopey Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2011 at 7:23pm
17,000 ft per minute at 30,000ft? It's a 747 not the Space Shuttle.

The higher you get, the lower the air density, the lower the engine performance - hence, you run out of power, your angle of attack is too high, and it stalls. Google "Coffin Corner".
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richt291187 View Drop Down
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Points: 27 		Post Options Post Options   Thanks (0) Thanks(0)   Quote richt291187 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2011 at 9:25pm

Now im hoping he means, 1700.. not 17,000 oh how I laughed made me chuckly though...

once at a decent level, i usually switch to using the mach scale.. keep an eye on your speed and adjust accordingly..
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shunti View Drop Down
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote shunti Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2011 at 10:00pm
Another typo i did mean 1,700 i also switch mach at aprox  20,000 feet and usaly set it at about 0.75 to 0.80 should i also reduce my climb rate at higher levels.
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DanielG123 View Drop Down
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Joined: 17 Sep 2011
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Points: 21 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DanielG123 Quote  Post ReplyReply Direct Link To This Post Posted: 26 Sep 2011 at 10:01pm
This has happened to me before in the default 747 except when I'm climbing above 15,000 I switch to mach and to a ascent rate of 1000fpm.
Hope this helps.Smile 
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