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Search: Posts Made By: OnePerRev
Showing results 1 to 35 of 66
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Forum: Rotorheads
4th Mar 2024, 14:25
Replies: 151
Views: 78,648
Posted By OnePerRev

In the video, we can see the gear were down,...

In the video, we can see the gear were down, broke during retrieval. We also see the tail spinning in concert with the main rotor head, indicating tail drive train connection still intact. Given...
Forum: Rotorheads
2nd Mar 2024, 15:55
Replies: 151
Views: 78,648
Posted By OnePerRev

Zoom in and see those tail blades have some big...

Zoom in and see those tail blades have some big lengthwise cracks in them. They were probably spinning hard to do that damage.
Forum: Military Aviation
25th Feb 2024, 00:32
Replies: 50
Views: 15,401
Posted By OnePerRev

Over-running clutches can fundamentally slip, and...

Over-running clutches can fundamentally slip, and re-engage. Seems this application has had more than it's fair share. Maybe the metal had issues, but Problem here is the sudden torque spike from...
Forum: Military Aviation
24th Feb 2024, 14:54
Replies: 50
Views: 15,401
Posted By OnePerRev

The Air Force said Tuesday that investigators...

The Air Force said Tuesday that investigators have determined a parts failure occurred during an Osprey crash in Japan in November that killed all eight airmen on board, but the root cause of the...
Forum: Military Aviation
9th Feb 2024, 03:51
Replies: 37
Views: 8,460
Posted By OnePerRev

The T900 series is intended to have variants to...

The T900 series is intended to have variants to replace the T700 family... so that is a long list of platforms, notably Blackhawk and Apache. If the fuel efficiency improvement is proven, and...
Forum: Military Aviation
6th Feb 2024, 23:49
Replies: 50
Views: 15,401
Posted By OnePerRev

Cause determined? ...

Cause determined?

https://www.pbs.org/newshour/politics/the-pentagon-believes-it-has-identified-the-problem-behind-fatal-osprey-crash-and-grounding-of-fleet
Forum: Rotorheads
12th Dec 2023, 21:40
Replies: 2
Views: 1,362
Posted By OnePerRev

Osprey Crash and Grounding - Japan 2023

Had not seen this, but sounds like a big deal to ground the fleet. Not much news out there, witness said it flipped and burst into flames before crashing. Somebody has to know something..WASHINGTON...
Forum: Rotorheads
25th Sep 2023, 17:15
Replies: 47
Views: 18,982
Posted By OnePerRev

Input sections were torn away, so the engines got...

Input sections were torn away, so the engines got loaded backwards too from the support tube. Probably Toast.
Forum: Rotorheads
2nd Mar 2020, 21:53
Replies: 48
Views: 11,400
Posted By OnePerRev

Politics in this sort of thing are largely...

Politics in this sort of thing are largely emotional, good for here as a rumor. They also come into play on DOD budget appropriation discussions, and kill or don't kill a program. Politics don't...
Forum: Rotorheads
27th Feb 2020, 03:01
Replies: 48
Views: 11,400
Posted By OnePerRev

Slats in the Beanie?

Slats in the Beanie?
Forum: Rotorheads
20th Feb 2020, 02:40
Replies: 186
Views: 38,938
Posted By OnePerRev

It was expensive, but it was far more than your...

It was expensive, but it was far more than your average helicopter. Low Observability was one area, but actually the NBC threat (Nuclear, Biological, Chemical) drove the design to pressurized...
Forum: Rotorheads
3rd Feb 2019, 03:46
Replies: 7
Views: 3,299
Posted By OnePerRev

Don't hold your breath, I understand there are or...

Don't hold your breath, I understand there are or will be restrictions on commercial variant, and exporting... but yes, down the road why not a commercial variant.
Forum: Rotorheads
13th Nov 2018, 02:04
Replies: 16
Views: 4,204
Posted By OnePerRev

Is there not a means for engine disengagement,...

Is there not a means for engine disengagement, free wheeling, clutch, etc.?
Assuming there is, then failed engine would not stop the rotor. What else could do that on this model?
Forum: Rotorheads
13th Nov 2018, 01:29
Replies: 1,254
Views: 706,754
Posted By OnePerRev

This is a dangerous assumption, in part led by a...

This is a dangerous assumption, in part led by a pervasive culture that safety wire, cotter pins, etc. actually help keep a joint together. Proper torque keeps it together, and absence of torque can...
Forum: Rotorheads
30th Oct 2018, 01:31
Replies: 1,254
Views: 706,754
Posted By OnePerRev

Maybe just my eyes on a grainy CCTV video, but it...

Maybe just my eyes on a grainy CCTV video, but it is not so clear to me that it turned right. Looks to me like it was yawing to the left before impact. Yes, we are speculating, and investigators...
Forum: Rotorheads
28th Oct 2018, 16:13
Replies: 1,254
Views: 706,754
Posted By OnePerRev

You are very correct, and this is not a new...

You are very correct, and this is not a new observation. US Army (USAAMRL) did a very comprehensive study of aviation crashes particularly in Korean and Vietnam wars, and determined that a...
Forum: Rotorheads
22nd Jul 2018, 03:14
Replies: 49
Views: 39,929
Posted By OnePerRev

Sorry. Auto correct got me. Information. (And...

Sorry. Auto correct got me. Information. (And lack)
Forum: Rotorheads
22nd Jul 2018, 03:12
Replies: 49
Views: 39,929
Posted By OnePerRev

Good insight on the adhesion or lac there of. ...

Good insight on the adhesion or lac there of.
Who has infinite this part? What material?
Forum: Rotorheads
20th Jul 2018, 00:03
Replies: 49
Views: 39,929
Posted By OnePerRev

The spindle fracture tells a big story. This...

The spindle fracture tells a big story.
This was not a repeat of the planetary failure chain of events, as I mentioned earlier, blades stay attached even after powered impact. Look at the tail...
Forum: Rotorheads
19th Jul 2018, 01:51
Replies: 49
Views: 39,929
Posted By OnePerRev

If you try to slow the video, or advance slowly,...

If you try to slow the video, or advance slowly, it seems as the coning angle is all over the place on takeoff. First it may appear normal, but seems to vary, then right around 9 seconds, when just...
Forum: Rotorheads
9th Nov 2017, 00:02
Replies: 212
Views: 117,086
Posted By OnePerRev

Testing is great. Challenge is "How" to test. ...

Testing is great. Challenge is "How" to test.
Interesting points by Concentric, but I fear that the focus on the spalling has led people to examine what we typically understand from spalling...
Forum: Rotorheads
1st Nov 2017, 00:37
Replies: 212
Views: 117,086
Posted By OnePerRev

Interesting Video from Airbus showing the exact...

Interesting Video from Airbus showing the exact failure that many of us here zeroed in on from the first photos of the broken pinion. Alarming that blame is cast on handling damage. Spalls move...
Forum: Rotorheads
7th Sep 2017, 03:08
Replies: 41
Views: 17,683
Posted By OnePerRev

If anyone has arrangement illustrations of the...

If anyone has arrangement illustrations of the tail drive and control system, it would be helpful. One thing jumped out to me was the shearing of the TRDS section 3 being missing, with only an end...
Forum: Rotorheads
19th Mar 2017, 23:49
Replies: 2,047
Views: 1,309,449
Posted By OnePerRev

The downdraft off the mountain is an interesting...

The downdraft off the mountain is an interesting theory, I seem to remember from my (Many years ago) college weather classes, that the disturbance can be higher than the object itself as well. Even...
Forum: Rotorheads
18th Mar 2017, 22:15
Replies: 2,047
Views: 1,309,449
Posted By OnePerRev

Godspeed, and enough of the foul weather. ...

Godspeed, and enough of the foul weather.


Families need word, and less importantly, the Salt water will destroy many aerospace materials the longer the exposure. And no official word on what...
Forum: Rotorheads
21st Dec 2016, 19:43
Replies: 172
Views: 75,414
Posted By OnePerRev

Yes Pablo, but more specific, the sun mesh drives...

Yes Pablo, but more specific, the sun mesh drives one flank and the ring drives on the other side, whereas in a single mesh you only have loading typically on one side of a tooth. On top of that, as...
Forum: Rotorheads
24th Sep 2016, 19:31
Replies: 44
Views: 11,312
Posted By OnePerRev

Nick Lappos - Get Well Soon

It was Reported in another thread that Nick is inn the hospital, recovering from massive cardiac arrest.


Nick - We will keep you in our prayers as one of the family. Speedy and full recovery is...
Forum: Rotorheads
24th Sep 2016, 19:15
Replies: 7
Views: 1,755
Posted By OnePerRev

Good article actually, and the point of the...

Good article actually, and the point of the thread is the Millitary aspect of readiness, and how an old fleet is neglected. This should not be vaulted into an east versus west manufacturing debate,...
Forum: Rotorheads
24th Sep 2016, 18:29
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

Does anyone have an English translation of this...

Does anyone have an English translation of this document?
Forum: Rotorheads
12th Aug 2016, 17:25
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

Spalling

Agree that the Bell pinion photo is relevant, but it may have helped initially if it explained that it was a different product.


Spalling is a quite normal "wearout" mode in gear or bearing...
Forum: Rotorheads
15th Jun 2016, 17:34
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

29.923 is endurance, which evaluates wear and...

29.923 is endurance, which evaluates wear and general durability - different than fatigue. Fatigue comes from 29.571. The regulation does not specify handling any different for gears, but the AC...
Forum: Rotorheads
14th Jun 2016, 18:20
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

Thanks John, Seems to me the roller is probably...

Thanks John,
Seems to me the roller is probably secondary - The carrier deformation indicates that tremendous inertial forces were in play which could cause pinion deformation and roller ejection. ...
Forum: Rotorheads
14th Jun 2016, 17:02
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

John, Don't know about the published CRT as...

John,
Don't know about the published CRT as others are posting about, but we can assume that the fatigue approach is NOT as you say for gears. It is close, however. The standards have not changed...
Forum: Rotorheads
11th Jun 2016, 00:33
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

Concentric, Nice first post. On a 'rumor...

Concentric,
Nice first post.
On a 'rumor network' such as this, we find both wild speculation based on agenda and emotion, and then sometimes a little educated insight.. Thank you for the latter. ...
Forum: Rotorheads
5th Jun 2016, 02:04
Replies: 1,949
Views: 1,588,066
Posted By OnePerRev

The problem with the bevel shaft affecting the...

The problem with the bevel shaft affecting the planet theory is that it would probably affect first stage. Not to say it didn't end up that way, we don't know. First stage sun was worn uneven. About...
Showing results 1 to 35 of 66
 
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