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Gyroscopic Effect Of Turbo Fan Engines  
User currently offlinedhawald3 From India, joined Jun 2011, 17 posts, RR: 0
Posted (3 years 4 months 3 weeks 16 hours ago) and read 7104 times:

Hi there!

the gyroscopic effect due to the rotating mass affects engines, it is more pronounced in turbo prop engines due to a larger fan.

Even though it is less in turbofan engines is there anything done to counteract it in modern turbofan engines?

3 replies: All unread, jump to last
User currently offlinerwessel From United States of America, joined Jan 2007, 2740 posts, RR: 2
Reply 1, posted (3 years 4 months 3 weeks 14 hours ago) and read 7049 times:
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Not really. Compared to the mass of the aircraft, the effect is pretty small, particularly since much of the rotating mass is in the relatively small diameter section of the engine. Some engines do have counter-rotating shafts, and that will obviously reduce the effect, but it's not a prime consideration.

User currently onlineStarlionblue From Greenland, joined Feb 2004, 17655 posts, RR: 65
Reply 2, posted (3 years 4 months 3 weeks 13 hours ago) and read 7032 times:

Quoting rwessel (Reply 1):
Some engines do have counter-rotating shafts, and that will obviously reduce the effect, but it's not a prime consideration.

Counter rotating shafts mitigate torque, not gyroscopic effects (rigidity in space and precession). Though I guess you get precession in opposite directions when the engines changes direction.

[Edited 2013-01-07 02:17:28]

[Edited 2013-01-07 02:18:17]

"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2620 posts, RR: 25
Reply 3, posted (3 years 4 months 3 weeks 7 hours ago) and read 6848 times:

For a V/STOL aircraft like the Harrier gyroscopic precession is important as it adversely affects hovering stability. That's why the Pegasus engine has counter-rotating shafts. Counter rotating shafts in engines like the RR Trent are more for aerodynamic reasons than to reduce precession torque. Airliners don't usually pitch or yaw at high rates so any precession torque will be relatively low, but it is taken into account when stressing the engine mountings. It's more likely to be significant in a military fighter as a rapid pitch up will create a yawing moment.

The glass isn't half empty, or half full, it's twice as big as it needs to be.
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