Posted on 09/15/2012 7:55:47 PM PDT by smokingfrog
And who is the Idiot that put those Red Letters right on top of the Compressor Blades? Those sharp corners will tear them up, especially the “q” that's sticking down into the mechanism.
Are those guys Color Blind or something? I can clearly see the problem and I used to be a Corporate Manager, not a Jet Engine Mechanic.
My brother says Rolls Royce engines are better than GE and P&W.
I’m sure he’s not prejudiced, even though he works for Rolls Royce.
Hat tip.
Now that’s funny.
I regret I didn’t think of it first.
It sure was.
So to avoid overspeeding the Turbine, they intentially allow the LPT Rotors to crash into the LPT stators, because that is safer than the alternative (a grenade).
That would mean there is no reverse thrust loaded Bearing aft of this part that breaks... hmmmmmmmm....
I wonder if normal takeoff run ups are considered "extreme stress events".
GE is going to have to walk a fine line if they want to make a part that doesn't break, yet breaks when they want it to and not have the airline inspect it every 10 flights to see if its breaking yet. They are asking a lot out of IHI.
Presumably the engine control shuts the fuel down immediately upon sensing the turbine overspeed. However, I wonder if it continues to windmill during flight; I suppose this could be a problem.
I wear my hat proudly.
A similar incident occured in Japan recently.
Junk engines.
If there is instantly no load on the LPT, it would only take a second for the LPT to overspeed enough to throw all the blades... Don’t know if shutting off the fuel would work fast enough.
GE doesn’t either, which is apparently why they are using their LPT stator vanes as a Brake.
The LPT is making about 80,000 Shaft HP to spin the fan. If it no longer has to spin anything, that 80,000 HP is going to go somewhere else, real quick.
http://www.geaviation.com/engines/commercial/genx/firstflight.html
Victorville.
We took a tour of the facility and the test 747.
Don’t worry buddy, I stole it too!
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.