How Fast Does A 747 Engine Rotate

[747fan]

Hey Guys,

This has been bugging me for years. Just wondering if anyone out there knows on average, on full power, how fast (rotations per second) a 747 jet engine can rotate at?

I know its bloody fast

Cheers
747fan

[GrantT]

Re: How Fast Does A 747 Engine Rotate

Forget that i didn't know you were talking about the engine.

And its Revolutions per minute.

[SWA733Captain]

Re: How Fast Does A 747 Engine Rotate

I know its bloody fast

It's pretty fast for all jet engines...

And can you be more specific on what type of 747, what engine? There's a lot of different configurations.

[LRJet Guy]

I don't know about the large diameter fans, but the GE turbojets on the Lear are spinning about 19,000 rpm at 100%.

The little Garrett turboprops are spinning the turbine at around 30,000 rpm, while the prop turns around 1700.

The larger fans turn slower, but I would imagine they're still in the 15 to 19,000 rpm range in the turbine and compressor, and 10 to 15 with the fan depending on the engine. Many turbofans have a concentric shaft design where the fan turns slower than the rest of the engine.

I'll see what I can dig up in the ol' textbooks.

[jwenting]

The engines don't rotate...
The drife shaft and fans do rotate, and rotate at different speeds running from several hundred to several thousand rpm.

[LRJet Guy]

Thank you Captain Obvious....

[FlyCharlestonSC]

really



really



really



fast