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Boeing 777-200 Question

Fri Feb 08, 2002 2:08 am

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Why are the Boeing 772's Engines pointing inwards?
Thanks in Advance.

Another Day, Another Dollar.... Young Jeezy
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Joined: Tue Mar 13, 2001 8:03 pm

RE: Boeing 777-200 Question

Fri Feb 08, 2002 3:28 am

i think that the engines are angled slightly inwards so as not to suffer from the shock waves coming from the aircrafts nose when in cruise. i think that the same is also true oft the 747-400's outboard engines as they also point slightly inward

regds tuffty Smile
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RE: Boeing 777-200 Question

Fri Feb 08, 2002 11:28 am

many a/c have inward pointed engines...check out all the airbus a/c.
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RE: Boeing 777-200 Question

Fri Feb 08, 2002 1:38 pm

A post was written by VC-10 on this, very informative. It has to do with the bow wave.
Max Q
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Joined: Wed May 09, 2001 12:40 pm

RE: Boeing 777-200 Question

Sat Feb 09, 2002 3:56 am

It has nothing to do with the 'bow wave'

The reason for the inward cant of the engines is to
direct the thrust vector to assist in aircraft control in the event of an engine failure.
The best contribution to safety is a competent Pilot.

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Max Q

Sat Feb 16, 2002 2:55 pm

Could you please elaborate on your answer more? From what I gathered on it. That if the engine intakes were canted towards the nose of the A/C, then the thrust would be canted away from the rear body. So if an engine failure occurred, the thrust from the operating engine with its cant would only increase the yawing tendency.

Thanks, Ziggy  Smile
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RE: Boeing 777-200 Question

Sun Feb 17, 2002 1:58 pm

I was thinking the same thing ziggy, if the engine was canted outward it would counteract the yawing, but pointing them inward would make the yawing worse. I think tuffty's answer was correct from what I have learned in my av studies. Anyone care to correct me?
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RE: Boeing 777-200 Question

Mon Feb 18, 2002 1:23 am

I'm not sure of exactly why and how it works, but I do know that the angle (I believe the terms is the engines are "towed inward") has to do with aerodynamics, not control. The bow wave may be the aerodynamic item I'm thinking of, but I am fairly sure it has nothing to do with engine out control. Es mentioned above, the towed engines would increase the yawing tendencies of the plane. The bow wave makes sense: if air hits the nose it woult be deflected back at an angle. If the engines are aligned to that angle, they would be pointing straight in to the majority of the airflow, cutting down turbulence at the intake.
CFI--Certfied Freakin Idiot
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RE: Boeing 777-200 Question

Mon Feb 18, 2002 7:57 am

It's what Dw747400 says. The nose directs the airflow at an angle towards the rear. It's like the wave generated by the nose of a boat on water. With the engine 'tilt', the airflow will run straight through the intake, not angled, which reduces turbulence. You can sort of picture the problem of uneven airflow hitting the inner side of the engine without the tilt.


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