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Question for school, and why don\'t fans go trough the sound barrier/

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EHM-2173 Bastiaan:
Hey guys, I am making something for school, it is for my exams. Does anyone know how long one fan is from the jet engine of a modern aircraft/

I am trying to impress the teachers with my math and I'm going to calculate how many kilometres one fan travels á minute :P

EDIT. I estimated that a jet engine is, without its housing, 2 metres high. A little calculation said that one fan travelles around 282 km á minute. Then, why doesnt it give a load bang as it goes trough the sound barrier/

EHM-1829 Trevor:
Hi Bastiaan
 It is 122cm from the centre of the Spinner cone to the tip of the blade on a GE CF6_80C2 Engine
The blade is 75cm in length.
Hope this helps mate.

EHM-6861 Hunter:
I'm sorry, but what do you mean my a fan?

EHM-2097 Andrei:

--- Quote ---Originally posted by EHM-6861 Hunter
I'm sorry, but what do you mean my a fan?
--- End quote ---
Well, a jet engine fan is a guy who loves jet engines :]

Sorry to interfere in an otherwise serious discussion but I just could not restrain myself from this easy joke. Bastiaan, don't do the same for school ;D

Andrei

EHM-1749 Hector:
Bastiaan, the sound barrier is created by compression of the airmass in front of a body that is moving through it pushing the molecules. It reaches a moment when the molecules cannot separate at the same speed the moving body so they just explode.
The fan sucks air so it creates a vaccumm in front of the engine nacelle so instead of compressing the airmass it actually de-compresses it.
Anyhow, feel free to confirm this theory before discussing it in a classroom.
Regards,
Hector

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