777-200
Topic Author
Posts: 966
Joined: Wed Mar 08, 2000 11:11 pm

Boeing 777-200 Question

Fri Feb 08, 2002 2:08 am


Click for large version
Click here for full size photo!

Photo © Chris Sheldon

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

777-200
Another Day, Another Dollar.... Young Jeezy
 
Tuffty
Posts: 91
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
 
brains
Posts: 249
Joined: Tue Nov 13, 2001 10:26 am

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.
Brains
 
Ziggy
Posts: 173
Joined: Thu Jun 21, 2001 11:07 am

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
Posts: 8039
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.


GGg
 
Ziggy
Posts: 173
Joined: Thu Jun 21, 2001 11:07 am

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
 
Beefmoney
Posts: 1071
Joined: Tue Oct 10, 2000 2:16 am

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?
 
dw747400
Posts: 1100
Joined: Wed Aug 15, 2001 8:24 am

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
 
bio15
Posts: 1048
Joined: Fri Mar 23, 2001 8:10 am

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.

-bio

Who is online

Users browsing this forum: No registered users and 44 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos