Engine configurations
Sims Fly Virtually
Join Date: Jun 2001
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Shaker/Pusher
Originally Posted by barit1
The 727 in UK registry only required a stickpusher, but not anywhere else IIRC.
But it was a long time ago, and I didn't fly the 1-11s or Tridents. Anyone with more recent memories?
I think the point that barit1 was trying to make was that it was only a UK requirement for the 727 to have a stick pusher. As it was/is for the other UK registered T tails. Trident, 1-11, VC-10 etc. Not sure about the DC9/MD80 as McDonnel Douglas is just Heath Robinson having a laugh!
Coming back to my earlier point about the tail mounted engines and the deep stall. I always understood that an a/c with wing mounted engines has the ability to 'power out' of a stall whereas tail mounted engines will stall/surge in a deep stall as the disrupted airflow over the wing disturbs the airflow into the engine intakes. IE 1-11.
The original design for the 757 had a T-tail and wing mounted engines. Would this have suffered from an unrecoverable deep stall?
Coming back to my earlier point about the tail mounted engines and the deep stall. I always understood that an a/c with wing mounted engines has the ability to 'power out' of a stall whereas tail mounted engines will stall/surge in a deep stall as the disrupted airflow over the wing disturbs the airflow into the engine intakes. IE 1-11.
The original design for the 757 had a T-tail and wing mounted engines. Would this have suffered from an unrecoverable deep stall?
Sims Fly Virtually
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Yes, "wing shadow" does cause problems for rear-mounted engines,as well as for the tail control surfaces.
Not sure if "powering out" would help much (anyone ttried it?) either with rear engines or even with wing-mounted - I suspect the wing-mounted engines (below the wing) would tend to give you a pitch-up moment, which is the last thing you need when you do not have the tail to control pitch. I have heard the idea suggested (at least, for tail-mount engines)
Not sure if "powering out" would help much (anyone ttried it?) either with rear engines or even with wing-mounted - I suspect the wing-mounted engines (below the wing) would tend to give you a pitch-up moment, which is the last thing you need when you do not have the tail to control pitch. I have heard the idea suggested (at least, for tail-mount engines)
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Whenever we did airtests on the VC10 (four engines tail mounted) we had an extra cockpit instrument added which displayed angle of attack. There was a limit beyond which we were warned not to go, lest a deep stall set in. There was apparently no recovery possible from this deep stall except by utilising the tail parachute they fitted only to the original test aircraft on which they defined the safe operational envelope.
Hope this helps. BRGDS
Hope this helps. BRGDS
