Simviation Forum - They all look the same!

Reply #30 - Dec 27^th, 2009 at 3:37pm

chornedsnorkack Offline
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expat wrote on Dec 20^th, 2009 at 8:10am:

chornedsnorkack wrote on Dec 20^th, 2009 at 3:22am:

Quote:

There has never been a widebody aircraft with tail-mounted engines, point is, there are reasons for this.

And how does the performance of a BAC 3-11 compete against Airbus 300?

As pointed out, it was never built so the question is mute Huh

Matt

What was the reason it was not built?

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Reply #31 - Dec 27^th, 2009 at 3:53pm

Hagar Offline
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chornedsnorkack wrote on Dec 27^th, 2009 at 3:37pm:

expat wrote on Dec 20^th, 2009 at 8:10am:

chornedsnorkack wrote on Dec 20^th, 2009 at 3:22am:

Quote:

There has never been a widebody aircraft with tail-mounted engines, point is, there are reasons for this.

And how does the performance of a BAC 3-11 compete against Airbus 300?

As pointed out, it was never built so the question is mute Huh

Matt

What was the reason it was not built?

I think that was mainly political.

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Reply #32 - Dec 27^th, 2009 at 10:40pm

OVERLORD_CHRIS Offline
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C wrote on Dec 19^th, 2009 at 10:48am:

OVERLORD_CHRIS wrote on Dec 19^th, 2009 at 9:15am:

C wrote on Dec 18^th, 2009 at 11:08am:

Having the engines half way out along the wings make it fairly inefficient if one fails. Having them close to the centreline of the aeroplane, such as a DC-9, VC10, BAC 1-11 & 727, means it has a lot less of an effect should you lose an engine. In a 4 jet in the configuration of the A340, 747 and 707 type, lose two on one side, and compared to say the VC10/IL62, life could be very interesting, and lead to a very aching leg!

This fact has yet to stop any 4 engine plane, let alone a twin engine plane. On September 11th when all flight got ground a watched a C-5B land with #1 & #2 motors flamed out, only had the right side, and it made a perfect landing like all were still working, they just landed long since only the reverser's on the one side worked.

That was landing, which is quite a different kettle of fish to take off. Having chatted to some USN 707-frame drivers last year in the desert, their biggest fear was losing two on take-off. Not guaranteed to ruin your day, but certainly going to make it more difficult.

As for the initial part of your reply, I guarantee that at some point, it has.

Here you go, when GE was testing the GE-90 for 777, they mounted it on the 747, and since it was so powerful they cut the regular 747's motors and just flew it around on one motor. They show it around the 2:40 mark.

http://www.youtube.com/watch?v=tT5EZ5itYH4

When I was in technical school, we were told that Boeing flew the 777 on a test flight on one motor just to show that it could operate safely on one motor for extended periods of time. But I can't find that Information.

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Reply #33 - Dec 27^th, 2009 at 11:23pm

DaveSims Offline
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OVERLORD_CHRIS wrote on Dec 27^th, 2009 at 10:40pm:

C wrote on Dec 19^th, 2009 at 10:48am:

OVERLORD_CHRIS wrote on Dec 19^th, 2009 at 9:15am:

C wrote on Dec 18^th, 2009 at 11:08am:

Having the engines half way out along the wings make it fairly inefficient if one fails. Having them close to the centreline of the aeroplane, such as a DC-9, VC10, BAC 1-11 & 727, means it has a lot less of an effect should you lose an engine. In a 4 jet in the configuration of the A340, 747 and 707 type, lose two on one side, and compared to say the VC10/IL62, life could be very interesting, and lead to a very aching leg!

This fact has yet to stop any 4 engine plane, let alone a twin engine plane. On September 11th when all flight got ground a watched a C-5B land with #1 & #2 motors flamed out, only had the right side, and it made a perfect landing like all were still working, they just landed long since only the reverser's on the one side worked.

That was landing, which is quite a different kettle of fish to take off. Having chatted to some USN 707-frame drivers last year in the desert, their biggest fear was losing two on take-off. Not guaranteed to ruin your day, but certainly going to make it more difficult.

As for the initial part of your reply, I guarantee that at some point, it has.

Here you go, when GE was testing the GE-90 for 777, they mounted it on the 747, and since it was so powerful they cut the regular 747's motors and just flew it around on one motor. They show it around the 2:40 mark.

http://www.youtube.com/watch?v=tT5EZ5itYH4

When I was in technical school, we were told that Boeing flew the 777 on a test flight on one motor just to show that it could operate safely on one motor for extended periods of time. But I can't find that Information.

That was probably part of the 777's ETOPS certification. Many years ago, aircraft were required to have four engines for long overwater flights (think 747). About 20-30 years ago, the FAA changed the rule, as aircraft such as the 757/767 came out and were more than capable of flying on one engine for extended periods of time.

Dave

www.flymcw.com

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Reply #34 - Dec 28^th, 2009 at 2:37pm

OVERLORD_CHRIS Offline
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DaveSims wrote on Dec 27^th, 2009 at 11:23pm:

That was probably part of the 777's ETOPS certification. Many years ago, aircraft were required to have four engines for long overwater flights (think 747). About 20-30 years ago, the FAA changed the rule, as aircraft such as the 757/767 came out and were more than capable of flying on one engine for extended periods of time.

Yeah that was it, but I can't find the info to back it up. But that showed that a plane with new engine technology could operate on one motor safely, and with modern Flight Control Computer(FCC) it would move the proper flight surface to accommodate the difference in power from one wing over another.

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