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Search: Posts Made By: Droop Snoot
Showing results 1 to 35 of 62
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Forum: Military Aviation
17th Dec 2022, 18:22
Replies: 106
Views: 54,384
Posted By Droop Snoot

Gums... Great to see you here! The nose...

Gums...

Great to see you here!

The nose gear sees a big load a a fairly odd angle... perhaps 10 degrees nose down. Could it be that the component of that load is not within the design limits of...
Forum: Rotorheads
13th Dec 2022, 22:17
Replies: 270
Views: 53,221
Posted By Droop Snoot

Stunning irony if Bell beats SAC with a...

Stunning irony if Bell beats SAC with a conventional single main rotor design.
Forum: Rotorheads
10th May 2022, 16:01
Replies: 42
Views: 8,087
Posted By Droop Snoot

FMEA or design assessment reports or related...

FMEA or design assessment reports or related documents could hold the answer to that question.

The braided hose has redundancy, but the fittings do not.

The Navy Command Report has some...
Forum: Rotorheads
9th May 2022, 19:52
Replies: 42
Views: 8,087
Posted By Droop Snoot

Jim and Spline... I stand corrected. it...

Jim and Spline...

I stand corrected. it sounds like the damper positioning system is a passive function, I haven't found any reference to valves. The accumulator is inside the shaft extension.
...
Forum: Rotorheads
5th May 2022, 20:55
Replies: 42
Views: 8,087
Posted By Droop Snoot

Could be true, not sure, but don't think so ...

Could be true, not sure, but don't think so

I know it is true for some hydraulic blade fold systems.

Someone is bound to chime in with the definitive facts!
Forum: Rotorheads
5th May 2022, 18:11
Replies: 42
Views: 8,087
Posted By Droop Snoot

Blade fold is driven by electric motors in the...

Blade fold is driven by electric motors in the spindles, not hydraulically by the dampers..

The BH has independent dampers. The NH has all 4 connected to a common reservoir under the beanie. Not...
Forum: Space Flight and Operations
29th Aug 2021, 18:56
Replies: 6
Views: 2,925
Posted By Droop Snoot

(happy voice) :) "..next objective is Max...

(happy voice) :) "..next objective is Max Q!"
Forum: Rotorheads
26th Jun 2021, 23:36
Replies: 28
Views: 5,288
Posted By Droop Snoot

And of course Nr for the B and C models was...

And of course Nr for the B and C models was increased from 100% to 107%

It's not unusual to bump up the Nr during original development and/or for followon models, with or without a change in...
Forum: Rumours & News
7th Mar 2021, 23:56
Replies: 288
Views: 262,377
Posted By Droop Snoot

JPcont: From the UAL 1175 report: ...

JPcont:

From the UAL 1175 report:

"Beyond 0.032” deep from the origin was a region of predominantly fatigue striations, suggesting stable low cycle fatigue (LCF) propagation (Figures 17– 1 9)....
Forum: Rumours & News
7th Mar 2021, 12:31
Replies: 288
Views: 262,377
Posted By Droop Snoot

Fatigue origins are in similar location in the...

Fatigue origins are in similar location in the cross section on UAL 1175 and UAL 238 fractures.
...
Forum: Rotorheads
28th Feb 2021, 12:54
Replies: 15
Views: 3,371
Posted By Droop Snoot

From the source linked in the original post: ...

From the source linked in the original post:

"While a robot brain can increase pilot safety, the S-64 has two big challenges to overcome—it’s old and it’s fuel hungry. That’s why the company isn’t...
Forum: Rumours & News
26th Feb 2021, 20:34
Replies: 288
Views: 262,377
Posted By Droop Snoot

From the NTSB Powerplants Group Chairman's...

From the NTSB Powerplants Group Chairman's Factual Report, UAL 1175, https://data.ntsb.gov/Docket/?NTSBNumber=DCA18IA092

"The PW4000 112-inch fan blade has a hollow core airfoil. The blade is made...
Forum: Rumours & News
23rd Feb 2021, 17:06
Replies: 288
Views: 262,377
Posted By Droop Snoot

billovitch The same basic concept is applied...

billovitch

The same basic concept is applied in the H-60 main rotor spindle tie rod. Redundant load paths are always desirable.
Forum: Rumours & News
23rd Feb 2021, 00:57
Replies: 288
Views: 262,377
Posted By Droop Snoot

td: That's fascinating. Because the blade...

td:
That's fascinating. Because the blade separation is due to static overload, it requires a higher flight load to do so. So even though takeoff and climb represents a pretty small portion of the...
Forum: Rumours & News
22nd Feb 2021, 20:31
Replies: 288
Views: 262,377
Posted By Droop Snoot

What is the on wing periodic inspection interval...

What is the on wing periodic inspection interval and method for the fan blades? :confused:
Forum: Rotorheads
22nd Feb 2021, 14:51
Replies: 75
Views: 21,386
Posted By Droop Snoot

Wink https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/...

https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/985x554/image_31d33a984b580d11950e09e5dea8dac2da1794ad.png


A Martian Kamov-er and thought the Russians sent Ingenuity!:D
Forum: Rotorheads
11th Feb 2021, 20:20
Replies: 18
Views: 6,986
Posted By Droop Snoot

Self inflicted only to the extent that you can...

Self inflicted only to the extent that you can control the vagaries of a 60 year old supply chain, and the expense and lead time required to qualify a new part or supplier. :ugh:
Forum: Rotorheads
6th Feb 2021, 01:08
Replies: 27
Views: 23,496
Posted By Droop Snoot

Wrench... Thanks. The first method had...

Wrench...

Thanks.

The first method had occurred to me, but I had never heard of it actually being used.

I have heard of using ultrasonic wall thickness measurements on the sidewall just...
Forum: Rotorheads
5th Feb 2021, 18:03
Replies: 27
Views: 23,496
Posted By Droop Snoot

How are the service limits established and...

How are the service limits established and verified... i.e., how do you know when the minimum wall thickness has been reached?
Forum: Rotorheads
19th Nov 2020, 14:25
Replies: 39
Views: 17,270
Posted By Droop Snoot

They would indeed fit, but in terms of...

They would indeed fit, but in terms of airworthiness, they are not certified.:=
Forum: Private Flying
23rd Oct 2020, 03:18
Replies: 9
Views: 4,797
Posted By Droop Snoot

Pilot DAR.... Thanks, I got a bit confused...

Pilot DAR....

Thanks, I got a bit confused because I saw the exemplar cracked part had been removed from the aircraft.

Just to develop the point about NDI... how severe is the failure mode? If...
Forum: Private Flying
23rd Oct 2020, 00:16
Replies: 9
Views: 4,797
Posted By Droop Snoot

Is there any consideration of modifying the...

Is there any consideration of modifying the relief to have one large radius instead of 2 smaller radii? This would considerably reduce the stress concentration factor. The surface should also be...
Forum: Rotorheads
24th Jul 2020, 17:38
Replies: 28
Views: 6,157
Posted By Droop Snoot

Sans… The failure mode that blakmax...

Sans…

The failure mode that blakmax describes is not addressed by the hot/wet environmental qualification testing you reference. The hydration mode is an adhesive failure mode at the metal/...
Forum: Rotorheads
21st Jul 2020, 19:13
Replies: 28
Views: 6,157
Posted By Droop Snoot

Some version of that idea has been applied to...

Some version of that idea has been applied to metal and composite blades as well! :ugh:
Forum: Rotorheads
21st Jul 2020, 19:10
Replies: 28
Views: 6,157
Posted By Droop Snoot

Film radiography (X-ray) is be used to verify...

Film radiography (X-ray) is be used to verify fiber orientation in a completed carbon fiber part, provided there is a representative radiopaque tracer present, such as fiberglass.

Radiography,...
Forum: Rotorheads
14th Jul 2020, 12:22
Replies: 128
Views: 36,516
Posted By Droop Snoot

In addition to directly addressing the...

In addition to directly addressing the discrepancy, "Conditional Inspections", in AMM Chapter 5, should be consulted during non routine maintenance. This data includes

hypothetical and known...
Forum: Rotorheads
3rd Jun 2020, 11:03
Replies: 18
Views: 3,886
Posted By Droop Snoot

In some cases they were very low... 3-4 rotor...

In some cases they were very low... 3-4 rotor diameters, and below the rooftops of adjacent buildings. And the crowd seems undeterred!

https://twitter.com/RobertDeNiroUS/status/1267645815134269441
Forum: Rotorheads
27th May 2020, 16:59
Replies: 17
Views: 4,400
Posted By Droop Snoot

It's remarkable.... “Accordingly the...

It's remarkable....

“Accordingly the lift/drag ratio was increased by about 36.91%”

... including the resolution of their wind tunnel tests!
Forum: Rotorheads
18th May 2020, 23:44
Replies: 148
Views: 65,452
Posted By Droop Snoot

JD... Are there any extraordinary procedures...

JD...

Are there any extraordinary procedures or precautions employed by pilots during an exercise like this, e.g. low altitude cruise flight, especially over water?

Would they likely be in a...
Forum: Rotorheads
14th May 2020, 13:34
Replies: 17
Views: 2,119
Posted By Droop Snoot

As you state, the rotor thrust is proportional to...

As you state, the rotor thrust is proportional to the steady blade lag angle. To produce more thrust, the collective pitch angle is increased, which demands more torque at the rotorhead, up to the...
Forum: Rotorheads
14th May 2020, 13:13
Replies: 148
Views: 65,452
Posted By Droop Snoot

The VH-92 model designation could be a little...

The VH-92 model designation could be a little misleading.

From a LM release:

"The VH-92A aircraft is based on Sikorsky’s successful and FAA-certified S-92A commercial aircraft, which recently...
Forum: Rotorheads
12th May 2020, 18:41
Replies: 17
Views: 2,119
Posted By Droop Snoot

As if Mg needs the least bit of encouragement to...

As if Mg needs the least bit of encouragement to combine with his friend O and return from whence they came!
Forum: Rotorheads
3rd Feb 2020, 17:00
Replies: 756
Views: 900,233
Posted By Droop Snoot

https://www.pprune.org/australia-new-zealand-pacif...

https://www.pprune.org/australia-new-zealand-pacific/629086-c130-down-ne-cooma-6.html#post10670047

Interesting explanation of online ADS-B data and how it can be accurately analyzed. I cannot...
Forum: Rotorheads
16th Oct 2019, 12:57
Replies: 186
Views: 38,638
Posted By Droop Snoot

Sultan (or other learned respondents)... ...

Sultan (or other learned respondents)...

Thanks for the input on speed requirements.

Can you weigh in on the FARA life cycle cost requirements?

I have never seen a calculation, but I imagine...
Forum: Rotorheads
5th Sep 2019, 20:33
Replies: 18
Views: 4,810
Posted By Droop Snoot

Red face VH-92A causes "discoloration" of South Lawn

https://www.nationaldefensemagazine.org/articles/2019/8/26/marine-one-replacement-preps-for-initial-operational-capability

GAO said:

“The lawn is a highly visible, size-constrained landing zone...
Showing results 1 to 35 of 62
 
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