Dear John,

I don't think that a turbine engine hitting some resonant frequency and
coming apart
has anything to do with revving the O200 over 2750 rpm.

I would bet that the redline was set more by them as that's where they
achieved the HP they had
set out to deliver. Using your empirical wisdom would DICtate that the
similarly sized Lycoming would
come apart a hundred or so RPM sooner, as it has a lower redline.

Happy New Year

Al

On Mon, 31 Dec 2001 17:54:16 +1100 "jtenhave@..."
<jtenhave@...> writes:

Hi David,

You and I are both right, but I should have been a bit more
concise. I
was referring to the remedial derating of the engine (i.e. reducing
the RPM
range out of resonance). This reduction enabled the jets to remain
flying
whilst the Rolls Royce engine designers stood in a circle taking
turns to
kick each others bums for overlooking the "not so obvious" and
trying to
explain to the bean counters why this "whoopsie" was going to cost
several
million dollars to fix.

happy New Year to you all

John

-----Original Message-----
From: David J. Gall [SMTP:David@...]
Sent: Monday, December 31, 2001 1:44 PM
To: Q-LIST@...
Subject: RE: [Q-LIST] Prop Questions

John,

You, of course, meant to say, "take the parts INTO the resonant
range."


David J. Gall

-----Original Message-----
From: jtenhave@... [mailto:jtenhave@...]
Sent: Sunday, December 30, 2001 8:07 PM
To: 'Q-LIST@...'
Subject: RE: [Q-LIST] Prop Questions

Richard,

and the TBO is......?

< snip, snip... >

From memory 6% change in RPM was all that was required to take

the
parts
out of the resonant range.





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