Engine Differences
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Join Date: Mar 2001
Location: Abroad
Age: 51
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Engine Differences
Hello to one and all lovely folk !
Time has come again, when contemplating certain things in life has left me in a dazzled state
Okay, okay... to cut to the chase - what I require from all you brainy, intelligent turbine engine buffs is information on the specific differences between a Fixed Shaft Turbine vs the Free Power Turbine.
Pros and Cons of each would be terrific
...and in case you are wondering - NO, I haven't 'lost it ' psychologically ... just an enquiry and to settle THE GREAT DEBATE between my flatmate ( who flies Fixed Shaft turbines) and myself - a Free Power Turbine dude.
All your help/respones much appreciated - LONG LIVE THE FREE POWER TURBINE
Regards to all in advance.
Time has come again, when contemplating certain things in life has left me in a dazzled state
Okay, okay... to cut to the chase - what I require from all you brainy, intelligent turbine engine buffs is information on the specific differences between a Fixed Shaft Turbine vs the Free Power Turbine.
Pros and Cons of each would be terrific
...and in case you are wondering - NO, I haven't 'lost it ' psychologically ... just an enquiry and to settle THE GREAT DEBATE between my flatmate ( who flies Fixed Shaft turbines) and myself - a Free Power Turbine dude.
All your help/respones much appreciated - LONG LIVE THE FREE POWER TURBINE
Regards to all in advance.
Join Date: May 2002
Location: CB, Aust.
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perhaps this for starters
A free turbine engine can be designed so the power turbine(s) run at a different speed (RPM) to the compressor stages, thus allowing the engine designer to select the optimum design and speed for both sections of the engine to meet the particular requirement.
(higher propeller rotational speeds and noise level during ground operations?)
A fixed shaft system has longer shaft(s) creating more torsional loads and perhaps needing more bearings.
The starter/generator of a fixed shaft engine must turn over the dead weight and drag of the propeller so presumably is more robust, heavier, have a bigger current draw (perhaps requiring a longer recovery period for the battery before starting #2).
etc
regards
(higher propeller rotational speeds and noise level during ground operations?)
A fixed shaft system has longer shaft(s) creating more torsional loads and perhaps needing more bearings.
The starter/generator of a fixed shaft engine must turn over the dead weight and drag of the propeller so presumably is more robust, heavier, have a bigger current draw (perhaps requiring a longer recovery period for the battery before starting #2).
etc
regards
Join Date: Sep 2001
Location: Australia
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Very common Cathay type question that!... for anyone that is interested...
Sure there isnt an ulterior motive there Hottie??
Jeez I hate those Garrets uuugggghhhh give me some earplugs!
Sure there isnt an ulterior motive there Hottie??
Jeez I hate those Garrets uuugggghhhh give me some earplugs!
Join Date: Mar 1999
Location: Australia
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Having flown many hours in 2 fixed shaft aircraft and 4 free turbine aircraft, their are only 2 major differences.
1. A fixed shaft has instant power when the leavers move forward.
2. A free turbine aircraft slows instantly when the leavers move back.
Other than these, they fly and operate the same way.
1. A fixed shaft has instant power when the leavers move forward.
2. A free turbine aircraft slows instantly when the leavers move back.
Other than these, they fly and operate the same way.
Join Date: Mar 2001
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Hottie a free turbine has a lot of hot wind blows on the windmill thingy attached to the kepellor geer box.
The other ones geerbox is fixed to the hot windmill thingy in the hot part and is connected directly to the kepellor. None of this should be touched or altered by a pilot.Some times its not a bad idea to cover the EGT thingy when yer startin with a flat battery.
Hope this clears it up for you.
Your pal.
The other ones geerbox is fixed to the hot windmill thingy in the hot part and is connected directly to the kepellor. None of this should be touched or altered by a pilot.Some times its not a bad idea to cover the EGT thingy when yer startin with a flat battery.
Hope this clears it up for you.
Your pal.
