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Search: Posts Made By: Lyman
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Forum: Tech Log
13th May 2012, 19:38
Replies: 746
Views: 210,934
Posted By Lyman

TurbineD As always, thanks for your patience...

TurbineD

As always, thanks for your patience and expertise. A quote from you....

You will note that if the stage 2 HPT disc (similar position to the IPT disc) became liberated for one reason or...
Forum: Tech Log
11th May 2012, 20:58
Replies: 746
Views: 210,934
Posted By Lyman

So let me ask you then re: your response. Does...

So let me ask you then re: your response. Does the GP have an IPT turbine that is affixed with the same architecture as the T9? Because if it is fit on to the shaft via keyway or splines, the...
Forum: Tech Log
11th May 2012, 19:03
Replies: 746
Views: 210,934
Posted By Lyman

TD......"You will note that if the stage 2 HPT...

TD......"You will note that if the stage 2 HPT disc (similar position to the IPT disc) became liberated for one reason or another, if it would move back, the turbine blades would clash with the stage...
Forum: Tech Log
11th May 2012, 18:34
Replies: 746
Views: 210,934
Posted By Lyman

I take it then that the airfoils are to be...

I take it then that the airfoils are to be sacrificial? I do not see how the IPT blades can clash with the LPT vanes without transiting the Stator "Platform".

They cannot get there from there....
Forum: Tech Log
11th May 2012, 09:26
Replies: 746
Views: 210,934
Posted By Lyman

From the drawing, I note a build up of the LPT...

From the drawing, I note a build up of the LPT vanes platform at the area that makes contact first with IPT should it drift aftward. The portion of the IPT that makes contact with this strengthened...
Forum: Tech Log
11th May 2012, 08:57
Replies: 746
Views: 210,934
Posted By Lyman

@lomapaseo.....Whether the disk moves aft or not,...

@lomapaseo.....Whether the disk moves aft or not, it would still free wheel up in speed at a very rapid rate while remaining centered about the engine centerline. The tendency is for it to seek...
Forum: Tech Log
11th May 2012, 08:42
Replies: 746
Views: 210,934
Posted By Lyman

Lomapaseo, @ TurbineD...."I assure you that...

Lomapaseo,

@ TurbineD...."I assure you that the intact disc (minus the drive arm flange) is only unsupported for a few milliseconds, as the gas pressure drives it aft to a false bearing surface in...
Forum: Tech Log
10th May 2012, 16:33
Replies: 746
Views: 210,934
Posted By Lyman

Hi gents. I do not misunderstand your...

Hi gents. I do not misunderstand your conclusions. Matter of fact, it is very difficult to disagree with them. The Problem.

The drawing is not the one I had in my other computer, which is...
Forum: Tech Log
9th May 2012, 21:11
Replies: 746
Views: 210,934
Posted By Lyman

post 1415 previous thread, looking

post 1415 previous thread, looking
Forum: Tech Log
9th May 2012, 19:28
Replies: 746
Views: 210,934
Posted By Lyman

You seem to keep referring to the IP main shaft,...

You seem to keep referring to the IP main shaft, but is there any mention of a pertinent shaft defect in this accident report?....

***************************************************************
...
Forum: Tech Log
9th May 2012, 14:35
Replies: 746
Views: 210,934
Posted By Lyman

Hi barit1 I think it is HPC that spins contra....

Hi barit1 I think it is HPC that spins contra. The HP shaft is nested inside the well of the IP shaft and the bearings for each have a ~20000 rpm differential due rotation opposition.

TD: From...
Forum: Tech Log
9th May 2012, 00:35
Replies: 746
Views: 210,934
Posted By Lyman

I suggest that once the circumferential fracture...

I suggest that once the circumferential fracture separated the wheel from the power arm, the disc was already exceeding a (somewhat lower) burst speed.

Are we looking at the same schematic? The...
Forum: Tech Log
29th Apr 2012, 21:44
Replies: 746
Views: 210,934
Posted By Lyman

Hi barit1, thanks for the reply. I think there is...

Hi barit1, thanks for the reply. I think there is merit to what you say, without doubt, these rotors are phenomenally strong. The design consideration is strictly that to which you allude, resistant...
Forum: Tech Log
29th Apr 2012, 17:07
Replies: 746
Views: 210,934
Posted By Lyman

TD: " The rotational inertia for the given mass...

TD: " The rotational inertia for the given mass is unbelievable in this situation, The turbine wheel was driving nothing, a free turbine is a nightmare. Additionally, there was nothing in the way to...
Forum: Tech Log
26th Apr 2012, 16:02
Replies: 746
Views: 210,934
Posted By Lyman

I should have asked my question more directly....

I should have asked my question more directly. Once separated from the Power Arm, how can the Disk possibly retain stability sufficient to gain rpm? Won't it start going bs on its cramped environs?
...
Forum: Tech Log
26th Apr 2012, 03:57
Replies: 746
Views: 210,934
Posted By Lyman

barit1 To continue, is it possible that the...

barit1

To continue, is it possible that the six seconds of N2 spool drop are connected to the loss of the rigid joint at IPT/Drive ARM? Is the IPT slowing, and converting its energy into a...
Forum: Tech Log
26th Apr 2012, 03:31
Replies: 746
Views: 210,934
Posted By Lyman

Hi Turbine D Here... As the stress limits...

Hi Turbine D

Here... As the stress limits begin to be exceeded, the power drive arm fails, releasing the disk and the disk is free to rotate with no control over rotational speed. As the...
Forum: Tech Log
25th Apr 2012, 18:57
Replies: 746
Views: 210,934
Posted By Lyman

I am trying to build on what is (was) known at...

I am trying to build on what is (was) known at the time. The AD warned specifically of aftward axial transit of a shaft, causing damage to the a/c, and those on the ground (sic). The wear, specific...
Forum: Tech Log
25th Apr 2012, 18:15
Replies: 746
Views: 210,934
Posted By Lyman

barit1 The LP shaft by observation incurred...

barit1

The LP shaft by observation incurred no visible injury from the burst of the IPT. The HP shaft, nested withn the Drive Arm "Bell" is not seen. The third shaft of three, The Ishaft,...
Showing results 1 to 19 of 19


 
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