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747 with 5 engines


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My folks just took a trip from Sydney to Singapore on Qantas. They were delayed 4 hours at the airport. I thought my old man was joking when he told me they strapped on an extra turbine for a total of 5. I couldn't see that really working from a weight/balance/drag scenario.

 

But sure enough I found this:

 

0635769.jpg

 

Some people musta been confused when they saw this thing taxiing about.

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This is usually done to transport enginges around. Insted of packing it into a Cargo plane, you just strap it on to a 747 thats going to the destination anyway. It's not that big of deal for a 747 in terms of unbalance/drag etc etc :)

 

http://www.airliners.net/open.file/0289429/L/

[url=http://www.airliners.net/open.file/0289429/L/][/url]

http://www.airliners.net/open.file/136724/L/

 

http://www.airliners.net/open.file/392874/L/

 

http://www.airliners.net/open.file/255145/L/

 

http://www.airliners.net/open.file/783444/L/

 

Cheers

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Not really. In the case of engine failure, both wings still weigh the same. In this case you have an extra few tons on one side.

 

I guess more importantly... when is ED going to model this? :/

True :doh: But the engine is so close to the fuselage that the unbalance should be minimum. For a 350 ton plane, a 5 ton enginge should be able to be trimed out. Its like our ordinance on Military planes.....

 

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Hmmm... if you ask me it's about balance the plane against fat people. I think crew are force them to sit at left side. :P

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That's interesting.

 

I've seen it done before, but the previous images I've found have had an aerodynamic fairing over the intake.

 

I can't believe they're actually running the engine . . . .

I'd like to know more about that. Does the 747 have a fifth hardpoint down there?

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I can't believe they're actually running the engine . . . .

Im pretty sure the enginge is not running. They would u fit an extra throttlehandle, an extra start switch, an extra fire distinguisher etc, to the cockpit :)

I'd like to know more about that. Does the 747 have a fifth hardpoint down there?

Yes it does! At the time the 747 was introduced, the engines were more unreliable, so there was a bigger chance of engine failure and that you would get 'stranded' at some airport. Also there were less dedicated Cargo transports who would be able to ferry the engines to the stranded planes. Boeing, and other manufacturers too, therefor offerd this (cheap, simple and fast) method of transporting engines around.

Today, however, engines are more reliable, there are more dedicated cargo planes who transport the engines around, there are engine shops at more airports etc etc

 

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Im pretty sure the enginge is not running. They would u fit an extra throttlehandle, an extra start switch, an extra fire distinguisher etc, to the cockpit :)

believe me or not... they are actually testing engines this way. it shouldn't be a problem to add some controls to the cockpit, when they can fit an addiotional engine under the wing.

okay it was not a 747, but an airbus 340.

 

http://www.fly-net.org/aeromedia/a380eng.html

 

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believe me or not... they are actually testing engines this way. it shouldn't be a problem to add some controls to the cockpit, when they can fit an addiotional engine under the wing.

okay it was not a 747, but an airbus 340.

You're right about testing engines this way. BUT they dont test engines on commercial flights. Like the picture dodger showed, why would QANTAS test RR engins on a regular flight?? The pictures we've seen so far is where the engines are beeing ferried...

 

Here's some pics of the test a/c. Same showed in your links!

http://www.airliners.net/open.file/1242177/L/

 

http://www.airliners.net/open.file/0794871/L/

 

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It's just a spare. Not connected to the flight controls or fuel system in any way. The other pics are test beds for engine qualification, not what Qantas does.

 

You're right about testing engines this way. BUT they dont test engines on commercial flights. Like the picture dodger showed, why would QANTAS test RR engins on a regular flight?? The pictures we've seen so far is where the engines are beeing ferried...

 

Here's some pics of the test a/c. Same showed in your links!

http://www.airliners.net/open.file/1242177/L/

 

http://www.airliners.net/open.file/0794871/L/

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Heh, all engine manufacturers use flying test beds for their engines but I had no idea that engines are transported as bombs just like that :D So the question is- how many engines the 747 can carry under it's wings? :D

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It's just a spare.

 

Maybe.

 

Normally airlines use it to carry a broken engine to the next airport where it will get into the repair process. All airlines have contracts with MROs (Maintenance, Repair and Overhaul companies). And this is an easy way to carry the engine to their next MRO facility.

 

And yes, the engine is spinning - rotating in the wind. Can you believe how much your drag will increase if you would fix the blades against rotating?

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Maybe.

 

Normally airlines use it to carry a broken engine to the next airport where it will get into the repair process. All airlines have contracts with MROs (Maintenance, Repair and Overhaul companies). And this is an easy way to carry the engine to their next MRO facility.

 

And yes, the engine is spinning - rotating in the wind. Can you believe how much your drag will increase if you would fix the blades against rotating?

 

Yep - but I'd have thought it would be less draggy to fit a fairing over the intake.

 

 

Cheers for the info on the 5th hardpoint X-Man :)

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