PPRuNe Forums - What are the differences between Free and Fixed Shaft ?

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- - What are the differences between Free and Fixed Shaft ? (https://www.pprune.org/engineers-technicians/373436-what-differences-between-free-fixed-shaft.html)

coolman775

10th May 2009 15:21

What are the differences between Free and Fixed Shaft ?

What are the differences between Free and Fixed Shaft ?

smudgethecat

10th May 2009 16:31

ffs, dont be so bone idle, do a search on the net, theres reams of good info.

The Deec

10th May 2009 22:33

clear as mud.....

I guess the free shaft operates independently of T1 tubine which is connected to the compressor. This free shaft which operates via the T2 (which is a secondary turbine aft of T1 )is connected directly to the reduction gearbox which drives the prop.
As for the fixed shaft, compressor and turbine are both interlinked.

Clear as mud !

nodrama

12th May 2009 08:29

A 'free shaft' is driven by a free power turbine. Basic gas turbine theory and design......try reading a few books on the subject.

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