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Search: Posts Made By: etudiant
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Forum: Rotorheads
10th Nov 2017, 10:58
Replies: 212
Views: 116,958
Posted By etudiant

You raise an important point. Gearboxes are a...

You raise an important point.
Gearboxes are a common concern and every propulsion manufacturer has the scars to show from it. So there is a basis for a more concerted attack on the problem.
In...
Forum: Rotorheads
9th Nov 2017, 01:15
Replies: 212
Views: 116,958
Posted By etudiant

Gearboxes that transmit heavy loads are not new...

Gearboxes that transmit heavy loads are not new and neither are failures.
Here we have literally hundreds of specimens in all stages of life, from new to near retirement, so lots of specimens for...
Forum: Rotorheads
8th Nov 2017, 21:40
Replies: 212
Views: 116,958
Posted By etudiant

AnFi what are the alternatives? AH currently...

AnFi what are the alternatives?
AH currently has a multi billion dollar program near death. In that context, blowing up a hundred gear boxes would be a cheap solution, if it helped restore the type...
Forum: Rotorheads
8th Nov 2017, 10:04
Replies: 212
Views: 116,958
Posted By etudiant

Thank you, Concentric, for your insightful...

Thank you, Concentric, for your insightful comment.
It makes sense to focus on the component that failed, rather than the entire assembly.
As you point out, that minimizes the cost and maximizes...
Forum: Rotorheads
7th Nov 2017, 16:53
Replies: 212
Views: 116,958
Posted By etudiant

Would it be pointless to run some of these...

Would it be pointless to run some of these gearboxes to destruction?
Documenting the failure paths in order to provide some improved understanding of these disasters. Perhaps we might even learn...
Forum: Rotorheads
1st Nov 2017, 02:14
Replies: 212
Views: 116,958
Posted By etudiant

Why would the regulators accept that handling...

Why would the regulators accept that handling damage argument if the evidence is not there?
If there is fatigue caused spalling, surely it should be possible to replicate the failure. We've had more...
Forum: Rotorheads
8th Oct 2017, 18:51
Replies: 212
Views: 116,958
Posted By etudiant

That is actually quite troublesome. It suggests...

That is actually quite troublesome.
It suggests both these bearing versions are overstressed and that it was merely chance that caused two MGBs with the same kind of bearing to possibly be subjected...
Forum: Rotorheads
6th Oct 2017, 20:17
Replies: 212
Views: 116,958
Posted By etudiant

As Twist and Shout points out, we have two very...

As Twist and Shout points out, we have two very similar accidents and the bearings are the only obvious common element.
The discussion in this thread suggests that the internal component failure...
Forum: Rotorheads
15th Jul 2017, 20:00
Replies: 212
Views: 116,958
Posted By etudiant

Surely the way to resolve this issue is by...

Surely the way to resolve this issue is by running the power train under sustained stress.

The 225 gear box has a graceless failure mechanism which was unexpected.
That should be reproducible,...
Forum: Rotorheads
8th Jul 2017, 13:21
Replies: 212
Views: 116,958
Posted By etudiant

The survey studiously avoids any controversial...

The survey studiously avoids any controversial topics.
The nearest it comes to intersecting the real world is when it lists the 4 corrective actions taken wrt the gear box and asks whether the...
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