I've always found jet engines to be the coolest part of a plane, dunno why but they are pretty insane.

The largest jet engine in the world is that of a boeing 777, It has a 10 foot (3 meter) wide turbine blade and can spin faster than 2580rpm for take off (43 turns a second) (which is actually slow for a jet, because the larger the engine the slower it spins). Tempuratures inside can reach almost 3000F (1400C aprx)

one being fixed in the factory, each of those blades weigh 60 pounds, (27 KG), kind of scary when you think about it.
http://photos1.blogger.com/img/28/1768/640/Boeing_777_Engine.jpg


A falling apart engine of a 767
http://www.atsb.gov.au/aviation/tech-rep/8-01/images/cover.jpg

http://www.planespotting.net/icons/Y/yZDM2MjkwMmE4MjlkODA2MWNkZTJhNjE-icon.jpg

http://www.space4peace.org/contracts/jet_engine.jpg

http://www.jetphotos.net/images/e/Engine_Sunrise.jpg.65573.jpg.thumb

767 engine, interesting fact, that white squiggly line in the middle of the engine is so those with earphones know how fast it's spinning and if to keep away.
http://weareacamera.ilovegames.co.uk/data/3147.jpg

Flatbottomed jet of 737, the bottoms of these are flattened out because the plane is low and scraping the ground is a danger.
http://www.jetphotos.net/images/e/engineEI-DCH.jpg.44731.jpg.thumb

http://www.confederationc.on.ca/tourismandtravel/images/ws003.JPG

very cool....and one more thing, the most powerful jet engine in the world is actually General Electric's GE90-115B which powers the B777-300ER...

yea those were the first couple of pics, they're pretty intimidating looking :)

Here are some engine technical specifications I got on the B777-200LR and its engines:

Engines
maximum thrust:
GE90–110B1 - 110,100 lb (489 kN)
GE90-115B - 115,300 pounds (512 kN)

Maximum Fuel Capacity 53,440* U.S. gallons
(202,287 L)
*includes three optional tanks
47,890 U.S. gal (181,280 L)

Maximum Range:
9,420 nautical miles
(17,446 km)
Typical city pairs:
New York-Singapore
Perth-London
New York-Auckland
Chicago-Sydney
Miami-Taipei
(Approx. 19 hours)

It is a fantastic plane!!

one of the four air intake fans of a 747-400, 7.5 feet in diameter and max, 3000-3600 rpm (50-60 ps)

http://selair.selkirk.bc.ca/systems1/Movies/Turbo%20fan%20engine%20inlet.JPG

The fans in jet engines have broken very rarely, but when they do they can cause a tremendous amount of damage to the engine, as I'm sure you can imagine.

767 engine, interesting fact, that white squiggly line in the middle of the engine is so those with earphones know how fast it's spinning and if to keep away.


I didnt know that, and i was always curious about that. Thanks for the trivia.

^^I always thought it was a funny looking "G" that stood for GE because that was the engine manufacturer.

It's for both, it is the G for the GE symbol but most planes put them there for safety, at least that's what the pilot of a plane told me when I asked him.


Like this, this isn't a G, but good observation NIAL :)

http://www.atsb.gov.au/aviation/tech-rep/8-01/images/cover.jpg

The fans in jet engines have broken very rarely, but when they do they can cause a tremendous amount of damage to the engine, as I'm sure you can imagine.



They are built to withstand gravel and stuff like that because the suction is so powerful it will pick up debries of the runway and vaporize them. Birds have been a big problem in the past, but many large carriers are built to fly on one engine or the engine is so powerful it will vaporize them. The fan blades you see spin the slowest compared to the ones inside, during takeoff, which the engines spin the fastest in order to lift the plane off the ground quickly, you're average fan will spin 50-70 times per second depending on it's size, the fans inside spin over 140-170 times because they're the compressors.

I remember going to an airshow in Toronto and Pratt & Whitney had a 56,000 lb thrust JT8D (the kind used in 747s before the 747-400) on display (totally opened up and everything -- you can see the fuel pipes, oil pumps, exposed bypass fans and thrust reverse mechanisms -- though not a cutaway to see the combustion chamber) accompanied by an explanatory video a number of years ago.

I was so fascinated with it that I almost went to study Mechanical Engineering (I ended up studying another kind of engineering which I think is more suitable for me). Nevertheless, I still love the dynamics problems in class, particularly those regarding flight mechanics and airflow dynamics.

The engine output (thrust) is impressive -- the latest Rolls Royce and GE engines with 110,000 lb thrust -- as with the tricks used to gain fuel efficiency and thrust, such as blade geometry, triple spooling -- nothing really revolutionary, but just incremental refinements over years and years.

It is an engineering marvel -- 100,000+ lbs of pressure to accelerate a long object almost 1.2 million pounds (well you need 4 of them) in a relative short distance (12000 feet or so) typically with a 2000 feet / min initial climb, and designed to operate continuously for 12 - 14 hours with incredible reliability (especially with advanced engine health monitoring).

Another good place to see this -- and this time, you can see cutaways with the combustion chamber and all -- is at the Pima Air Museum in Tucson, AZ, USA -- all military planes (and experimental ones that never made it out of the lab) -- really cool.

very cool....and one more thing, the most powerful jet engine in the world is actually General Electric's GE90-115B which powers the B777-300ER...

... and the B777-200LR, as Nick showed. The -115B set a world record for thrust at an astounding 127,900 lbs. [force], though it's only rated at 115,300 lbs. thrust. The engine and nacelle combined are 3.43m in diameter, larger than the 3.4m fuselage of a Boeing 737. :)

The fans in jet engines have broken very rarely, but when they do they can cause a tremendous amount of damage to the engine, as I'm sure you can imagine.

It was the fan containment ring that contributed to the crash of United Airlines flight 232 in Sioux City, Iowa in 1989. I believe though that jet engines today are required to show that failure in any way shape or form will remain contained in its nacelle, and not damage the rest of the aircraft as in this flight's case.

each of those blades weigh 60 pounds, (27 KG), kind of scary when you think about it.

Here's another little juicy nugget to chew on next time you fly. Did you know that the turbine blades in jet engines operate above their melting temperature? :rofl:

They're kept intact by using internal coolant holes in the blades themselves.

:cheers:

... and the B777-200LR, as Nick showed. The -115B set a world record for thrust at an astounding 127,900 lbs. [force], though it's only rated at 115,300 lbs. thrust. The engine and nacelle combined are 3.43m in diameter, larger than the 3.4m fuselage of a Boeing 737. :)



The engine is wider than a 737? I never knew that but that's pretty impressive. 127k of thrust? damn, anyone know the thrust for an engine of a 747 400? It has to be less because there are 4 engines each about 2.5 meters in diameter

http://www.guenter-ullmann.de/concorde/bilder/dsc_2088.jpg

Military aircraft engines are a whole other story, especially with the movement towards stealthier engines for most types of combat and bomber jets.

I'd be interested in knowing what the maximum thrust is on the single engines that are available for the F-22 Raptor. I know that only a few will be built, but they will be built about 5 miles from where I live at the Lockheed-Martin facilities at Dobbins ARB in in suburban Atlanta. I can't wait to see one fly over this area!!

The engine is wider than a 737? I never knew that but that's pretty impressive. 127k of thrust? damn, anyone know the thrust for an engine of a 747 400? It has to be less because there are 4 engines each about 2.5 meters in diameter

It's like 50K-60K for standard 747 engines. In fact, GE strapped one of these boys to an old 747 they own and flew the entire plane on the SINGLE GE90-115B engine!

http://www.air-and-space.com/salval99/747%20ge90%20al.jpg

This is a blade from a GE90 engine, on display at the New York Museum of Modern Art:

http://geae.com/aboutgeae/presscenter/ge90/GE90_Blade.jpg

:cheers:

it's the beautifulliest part of an airplane, the ENGINES. i love the ones of the 777-200LR. so lovely.

the facts are the most lovely. so big, and so much trust...

Aren't the white stuff painted to confuse birds and discourage them from entering the engine?

^I'm sure it has alot of purposes.


It's like 50K-60K for standard 747 engines. In fact, GE strapped one of these boys to an old 747 they own and flew the entire plane on the SINGLE GE90-115B engine!

http://www.air-and-space.com/salval99/747%20ge90%20al.jpg


The original 747 was 60000lbs of thrust, the newer ones have larger engines, but damn! (@the pic) they should have just used 4 of those GE 90's the plane could go like 700mph! :D


The GE90 only uses all of it's thrust during takeoff, it goes down to 20000 Lbs (a fraction) at cruising altitude, GE had this on their website at the http://www.geae.com/education/engines101/ (TEST AN ENGINE) page of GE but it's only moving slightly slower, what's the reasoning of this, is it because of the thinness of the air?

(If the links I posted don't work paste them into you're browser)


http://www.boeing.com/commercial/747family/technical.html

Great 747 400 Tech specs! 910 000 Lbs! 455 tons! and the average engine thrust is 65000lbs.