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Engine Spool Rotation Direction  
User currently offlineGreeneyes53787 From United States of America, joined Aug 2000, 844 posts, RR: 0
Posted (15 years 7 months 1 week 3 days 4 hours ago) and read 5432 times:

I am wondering a few things.

Do modern high bypass engines all spool in the same direction? And do the fans rotate in the same direction as the basic turbine engine?

I know about the UDF engines with counter (or contra) rotating fans, and the turboprops with the same (counterrotation of props) on rare aircraft such as the Bear Bomber and similar transport from the Soviet geography. USA experimented with them too.

But what direction do the engines of today rotate?


5 replies: All unread, jump to last
User currently offlinePmk From United States of America, joined May 1999, 664 posts, RR: 2
Reply 1, posted (15 years 7 months 1 week 3 days 2 hours ago) and read 5388 times:

As I recall it is counterclockwise, except for some of the older RR engines, you know the english, always something different. Then again they also build electrical systems without fuses, so what do we expect!


User currently offlineAer Lingus From Ireland, joined May 2000, 1599 posts, RR: 0
Reply 2, posted (15 years 7 months 1 week 3 days 1 hour ago) and read 5378 times:

Well most engines' low pressure compressors (outer fan) spin anti-clockwise with the exception of the RR Trent. I think its all models although I'm not sure. I do know that its like that for the RR Trent 800 on the 777's


User currently offlineExPratt From United States of America, joined Mar 2000, 311 posts, RR: 0
Reply 3, posted (15 years 7 months 1 week 3 days 1 hour ago) and read 5380 times:

The P&W engines (JT3D, JT8D, JT9D, PW2000, and PW4000) and GE engines (GE90, CF6 and, CFM56) have the low and high pressure rotors rotating in a clockwise direction as you look forward from the rear of the engine. Some of the P&W Canada engines with multiple spools have them rotating in both directions. The Rolls Royce engines (RB211, Spey, Tay, and Trent) have the low, high, and intermediate rotors for those engines equipped with 3 spools rotating in a counterclockwise direction as looking forward from the rear of the engine.

User currently offlinePrebennorholm From Denmark, joined Mar 2000, 7137 posts, RR: 53
Reply 4, posted (15 years 7 months 6 days 23 hours ago) and read 5330 times:

Just for curiousity: The RR Pegasus engine in the Harrier VTOL (vertivcal take-off and landing) fighter is a two spool turbofan engine. The High pressure and low pressure sections rotate in OPPOSITE directions.
This unique design feature was chosen because it reduces or eliminates the otherwise nasty gyro effects which would make hovering flight much more difficult to control.
Best regards, Preben Norholm

Always keep your number of landings equal to your number of take-offs
User currently offlineGreeneyes53787 From United States of America, joined Aug 2000, 844 posts, RR: 0
Reply 5, posted (15 years 7 months 6 days 19 hours ago) and read 5329 times:


Thank you for your information. The Harrier is an interesting aeroplane. You probably know that the J-79 turbojet with the aftfan used in the Convair 990 was one with the turbojet spool rotating opposite in direction than the fan.

But probably today most fans rotate the same as the rest of the engine. This is what I am hearing here.


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