Sonic
Topic Author
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MD-11 Was The Last Trijet?

Fri Nov 10, 2000 5:43 am

Does MD-11 was the last trijet?
 
Red Panda
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 6:26 am

what do you mean by the last tri-jet?! you mean the latest tri-jet or the last model to be produced? hmmm..., if you mean the latter, then I think it is. I like MD-11 pretty much for its uniqueness in shape. The three engine design just gie the plane a sense of power. I especially like its uniquely designed winglets too. There is one pointing up and a small one pointing down.
 
modesto2
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 7:49 am

Unfortunately, I think this will be the last trijet. They are beautiful. But now, it's either two or four. But at least we still have the L-1011, MD-11, DC-10 and 727. In a few years from now...they'll be mostly gone. Then what'll we do?
 
Guest

RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 7:54 am

I am pretty sure it is not really the last trijet, there is some business trijet jet more modern and still in production.
 
thomacf
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 7:55 am

Do you think that Boeing will sell any MD-10's to the airlines or will they just be for the cago carriers?
 
pmk
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 8:00 am

1.The Dassult 900 and 50 are to the best of my knowledge out of production (3 engined exec jets).

2.As I recall the MD-10 mod was strictly a cargo mod. I also think it was designed and implemented by FedEx, but don't hold me to that.

Peter
 
Red Panda
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 8:02 am

MD-10 is just modified from the present DC10. There is no amazing thing behind MD-10. MD-10 is just a DC-10 with MD11's flight deck. that is it.
 
CPDC10-30
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 8:46 am

The MD-10 mod only applies to relativley short range DC10-10s...they have limited appeal anymore in the pax market. Passengers wouldn't be too thrilled about flying a 30 year old a/c either.

It is perfect for FedEx though...the picked up a whole bunch of 10-10s on the cheap and now only have one airplane to train their crews on.
 
PA006
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 9:02 am

I think they are still building the Yak-42.
 
akelley728
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 9:09 am

PA006:

I believe you're right. I also heard that the TU-154 was still in or at least available for production, although I'm not too sure of this.
 
CPDC10-30
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 11:23 am

I think the last TU-154 was produced in either 1996 or 1993...I can't remember exactly, sorry.
 
FDXmech
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 12:42 pm

Actually both DC10-10 and -30s are being converted to MD10s.
You're only as good as your last departure.
 
CPDC10-30
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 12:43 pm

Sorry, I stand corrected then. I was told by someone here before that it was only the 10-10 birds.
 
sv11
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 2:31 pm

Check out this link:
http://www.falcon.dassault-aviation.com/falcon/index.htm

It looks like Dassault still builds some Falcon tri-jets.

sv11
 
Salsa
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RE: MD-11 Was The Last Trijet?

Fri Nov 10, 2000 2:59 pm

I want to work on DC10s and MD11s.
Hope to they are waiting for me.... 
 
RIX
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RE: MD-11 Was The Last Trijet?

Sat Nov 11, 2000 12:42 am

Of Soviet tri-jets only Yak40 is definitely out of production. Tu154M is still available, there were (are?) frames to be completed. Yak42 was modified to several new versions, on of them is supposed to have two engines but I believe there still are standard versions available. (Anyone with more correct information?) Anyway, all three of them are older than MD11, so it is MD11 to be the last tri-jet... if not to consider it as only a DC10 modification.
 
AFa340-300E
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The Reason Why Tri-jets Are No Longer Produced

Sat Nov 11, 2000 4:04 am

Hello,

Considering the ETOPS rule, the trijet design is close to death in the commercial passenger aircraft sector.

A Boeing engineer once said "Three engines? That's the optimum worst!"

As early as in the early 1960s, Boeing engineers had to make a kind of roadshow with airlines in order to be sure the customers would order a three-engine aircraft. Eventually they went for it because this added some reliability to the aircraft, and therefore improved the aircraft use.

In 1978, when Boeing proposed the 777-100 and the 777-200, two versions of the 767 with three engines (respectively for transcontinental and intercontinental flights). But that's the last time they proposed a three-engine aircraft AFAIK. Even later, after 1986 when Boeing made quite a few proposals as part of the 767-X development program, the idea of a three-jet didn't come up.

ETOPS really killed three-engined aircraft. First the 60-minute rule applied to all but four-engine aircraft. Then this was restrictied to twins, giving an advantage to the tri-jets. But then with the introduction of the ETOPS rule in the early 1980s (first ETOPS flight in 1984), this was the end of this advantage.

Twins have always been more economic than tri-jets. But tri-jets were more reliable because engines were not as reliable as they are today. Now with the great improvement of the engine safety (they are among the safest pieces of an airliner), there's no argument remaining for a tri-jet.

Best regards,
Alain Mengus
 
Sonic
Topic Author
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RE: MD-11 Was The Last Trijet?

Sat Nov 11, 2000 5:41 am

But with 777's engines 747 would can fly with three engines, I thing. Ant Trijet is more profitable then quadjet, I thing. I don't thing that 747 would can be twinjet. So make it trijet: it would be more profitable. Correct me if I was wrong please.
 
AFa340-300E
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RE: MD-11 Was The Last Trijet?

Sat Nov 11, 2000 6:08 am

Hello Sonic,

Well... Thinks are unfortunalty not as easy as that...

First, there would be a large trouble with a 747 with three engines of the 777 for instance.

The only doable aircraft were the two 747SP proposal with three engines: one had one vs. two engines on the wings, and the other had a tail-engine.

But I guess what you mean (tell me if I'm wrong): why are the tri-jets considered as non-economic, whereas the quadjets are still under construction and even planned?

Well, AFAIK, there are other factors related to the tri-jets. The tail-engine has also caused troubles, because additional developments are needed to design all the system. And then you have troubles with the maintenance, ...

But what is a factor to take into account is the payload/range match and the fuel consumption.

I'm not really a specialist of the issue, but I would summary this by saying the tri-jets gathers the drawbacks of a quad without having the advantage of a twins.

Best regards,
Alain Mengus

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