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Forum: Tech Log
12th Dec 2010, 14:56
Replies: 130
Views: 29,244
Posted By barit1

bearfoil: In fact it penetrated the cowl...

bearfoil:

In fact it penetrated the cowl (LH), the left side of the core nozzle, the nozzle plug, and stuck in the right side of the nozzle and cowl. This is all fairly lightweight material...
Forum: Tech Log
11th Dec 2010, 17:56
Replies: 130
Views: 29,244
Posted By barit1

R-R Indy

Another view (http://www.manufacturing.net/News/2010/12/Aerospace-Whistleblower-Suit-Cites-Rolls-Plane-Engine-Flaws/)
Forum: Tech Log
5th Dec 2010, 14:10
Replies: 130
Views: 29,244
Posted By barit1

DERG: Incredible. Do the sums for SFC,...

DERG:


Incredible. Do the sums for SFC, you'll find your number would make the Trent a very uncompetitive engine.

(Unless, perhaps, you're referring to total fuel flow for four Trents on the...
Forum: Tech Log
4th Dec 2010, 16:32
Replies: 130
Views: 29,244
Posted By barit1

DERG - I'm having a hell of a time following post...

DERG - I'm having a hell of a time following post #88.

Firstly - Aircraft engines must burn a variety of fuels. Within the Jet A spec there is a range of specific gravity, a range of Hydrogen...
Forum: Tech Log
2nd Dec 2010, 21:48
Replies: 130
Views: 29,244
Posted By barit1

This speaks for itself. Oil fires almost always...

This speaks for itself. Oil fires almost always lead to major damage. Who can possibly decide the oil tube isn't critical? :uhoh:
Forum: Tech Log
2nd Dec 2010, 18:04
Replies: 130
Views: 29,244
Posted By barit1

Reminds one, somewhat, of UA232...

Reminds one, somewhat, of UA232 (http://en.wikipedia.org/wiki/United_Airlines_Flight_232).

Except in that case, UA had a known-high-time piece of hardware, with a known vulnerability, and they...
Forum: Tech Log
15th Nov 2010, 20:58
Replies: 130
Views: 29,244
Posted By barit1

DON'T argue with him, unless you wish a torrent...

DON'T argue with him, unless you wish a torrent of invective! :ugh:
Forum: Tech Log
15th Nov 2010, 12:49
Replies: 130
Views: 29,244
Posted By barit1

Once again: There are certified, published...

Once again:

There are certified, published operational limits. As long as ALL these limits are observed, the engine should run fine at MCT until fuel is exhausted. Is oil temperature not one of...
Forum: Tech Log
14th Nov 2010, 15:14
Replies: 130
Views: 29,244
Posted By barit1

Inasmuch as the failure occurred during climb,...

Inasmuch as the failure occurred during climb, perhaps at MCL thrust, which is no greater than MCT:

Is MCT for the 972 greater than for the 970? If so, I'd expect deterioration to be a bit faster,...
Forum: Tech Log
14th Nov 2010, 14:34
Replies: 130
Views: 29,244
Posted By barit1

If I read this right, QF's 747/RB211 IPT...

If I read this right, QF's 747/RB211 IPT uncontained failure is because "Qantas push 'em hard". Is this an acceptable way of life in the commercial airline industry? If engines are run within...
Forum: Tech Log
14th Nov 2010, 01:33
Replies: 130
Views: 29,244
Posted By barit1

We still have the QF RB211/747 SFO "explosion"...

We still have the QF RB211/747 SFO "explosion" and return to SFO (31 Aug), involving the IPT - it shed its blades, and thus the disc did not burst. I've heard claims of "no connection to the Trent...
Forum: Tech Log
10th Nov 2010, 11:59
Replies: 130
Views: 29,244
Posted By barit1

That would be hard to do. If you break down all...

That would be hard to do. If you break down all the static and dynamic air forces on a turbine, they sum to a large AFT component. In other words, the shaft is in tension, and if it ever fails, the...
Forum: Tech Log
7th Nov 2010, 19:01
Replies: 130
Views: 29,244
Posted By barit1

I don't have specific numbers, but one engineer...

I don't have specific numbers, but one engineer friend once compared the fragments of a failed turbine disc (of a RB211 or CF6 for example), as having the mass and velocity of a cannon ball. Good...
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