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Search: Posts Made By: CTR
Showing results 1 to 35 of 282
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Forum: Rotorheads
20th Apr 2024, 12:13
Replies: 268
Views: 52,796
Posted By CTR

No aircraft systems are ballistic proof, they are...

No aircraft systems are ballistic proof, they are only ballistic tolerant. But based on published photos, the V-280 will incorporates a fully redundant pylon conversion actuator design, like the...
Forum: Rotorheads
23rd Feb 2024, 22:31
Replies: 186
Views: 38,566
Posted By CTR

Otter, No problem. Interesting however,...

Otter,

No problem.

Interesting however, Bell Engineering has multiple times proposed a FBW upgrade to the Y and Z. Performance would be enhanced, and there would be a real weight savings by...
Forum: Rotorheads
22nd Feb 2024, 13:40
Replies: 186
Views: 38,566
Posted By CTR

Lonewolf, The H-1 Yankee and Zulu have...

Lonewolf,

The H-1 Yankee and Zulu have conventional mechanical controls with limited authority SAS. You are correct regarding the Comanche.
Forum: Rotorheads
21st Feb 2024, 18:05
Replies: 186
Views: 38,566
Posted By CTR

Solution, not the Cause

“Changes to the 525’s control laws were added to incorporate a collective control filter to target vibration near the 6 Hz band. The pre-existing cyclic control filters were also tuned and deepened,...
Forum: Rotorheads
20th Feb 2024, 00:25
Replies: 186
Views: 38,566
Posted By CTR

Couldn’t waste the time to respond further. You...

Couldn’t waste the time to respond further. You are entitled to your own opinions.
Forum: Rotorheads
18th Feb 2024, 15:26
Replies: 186
Views: 38,566
Posted By CTR

Sultan, Are you familiar with the song from...

Sultan,

Are you familiar with the song from the musical Hamilton, “The Room Where it Happens”?

I was in the proverbial room at Bell when it happened. A small group engineers risked their future...
Forum: Rotorheads
17th Feb 2024, 19:26
Replies: 186
Views: 38,566
Posted By CTR

Thanks for saving me the time and responding

Splinedrive,

Thank you for saving me the time, and responding with most of the points I would’ve been making. Building on one point that really concerns me, is training the next generation of...
Forum: Rotorheads
8th Nov 2023, 21:46
Replies: 186
Views: 38,566
Posted By CTR

This is the best cost and weight savings idea I...

This is the best cost and weight savings idea I have heard in a long while. I understand the benefit of having two brains in the cockpit. But does one of those brains have to be actually sitting in...
Forum: Rotorheads
3rd Nov 2023, 23:28
Replies: 186
Views: 38,566
Posted By CTR

X2 Technology, a Moon Shot?

I praise the truth that Sikorsky has invested heavily in X2 technology.

But Sikorsky has yet to prove the operational viability of X2 technology.

Just like the Apollo program did not lead to...
Forum: Rotorheads
28th Oct 2023, 13:12
Replies: 186
Views: 38,566
Posted By CTR

More Irony

One additional bit of historical irony in the FARA competition.

Sikorsky fully funded the Raider X prototype (not the FARA) on their own and teammate funding, absent any government request.
...
Forum: Rotorheads
27th Oct 2023, 11:27
Replies: 186
Views: 38,566
Posted By CTR

My Lockheed versus Bell déjà vu comment was to...

My Lockheed versus Bell déjà vu comment was to highlight the irony, not the historical equivalence of this competition match up.

Still, I enjoy reading history regarding the Cheyenne development....
Forum: Rotorheads
25th Oct 2023, 13:46
Replies: 186
Views: 38,566
Posted By CTR

Ground Run 2QFY24 and First Flight 4QF24.

So, based on the latest US Army press releases, we will hopefully see FARA competitors rotors turning sometime next summer, and first flights before the end of next year.
...
Forum: Rotorheads
24th Oct 2023, 14:54
Replies: 186
Views: 38,566
Posted By CTR

Lockheed Cheyenne vs Bell Cobra déjà vu

Am I the only one getting a feeling of déjà vu?

Lockheed is proposing extremely complex and expensive helicopter with high speed capability.

Bell is offering a low-cost alternative that may not...
Forum: Rotorheads
21st Oct 2023, 12:01
Replies: 186
Views: 38,566
Posted By CTR

Even with the engines installed in the Bell and...

Even with the engines installed in the Bell and Sikorsky FARAs, how long will it take for GE to complete Safety of Flight Testing an validate any software changes?

Until this work is completed,...
Forum: Rotorheads
11th Oct 2023, 09:01
Replies: 186
Views: 38,566
Posted By CTR

Lonewoof, Not exactly sure why you would...

Lonewoof,

Not exactly sure why you would specifically address me to this post. I do not disagree that the Kiowa was long past when it should’ve been retired. But retiring an aircraft without an...
Forum: Rotorheads
6th Aug 2023, 01:10
Replies: 186
Views: 38,566
Posted By CTR

Kiowa Warrior

Hard to believe FARA is a replacement for the Bowie knife simple Kiowa Warrior. A 14,000 lb FARA replaces a 7,000 OH-58D
Forum: Rotorheads
5th Aug 2023, 14:37
Replies: 186
Views: 38,566
Posted By CTR

From the The Defence Post article: Sikorsky...

From the The Defence Post article:

Sikorsky President Paul Lemmo said, “Our transformational RAIDER X will deliver broad benefits to the Army including the lowest schedule risk and greatest...
Forum: Rotorheads
26th Jul 2023, 01:36
Replies: 25
Views: 5,606
Posted By CTR

Gear Pump versus Variable Displacement Piston Pump

The 206A/B, like the 505 use a gear pump. The 206L, 407, 429, and 412 use variable displacement piston pumps.

Internal leakage in gear pumps prevents them from generating any significant...
Forum: Rotorheads
24th Jul 2023, 11:58
Replies: 25
Views: 5,606
Posted By CTR

Check Valve

https://cimg3.ibsrv.net/gimg/pprune.org-vbulletin/532x374/img_6598_34380ba4ffb419f7ce9cd9ccffdd1415b9cebb33.jpeg

The check valve does not have a call out, but you can see it in the schematic...
Forum: Rotorheads
20th Jul 2023, 22:35
Replies: 25
Views: 5,606
Posted By CTR

Hydraulic pumps on helicopters typically run 10...

Hydraulic pumps on helicopters typically run 10 to 15 times faster on the main RPM. So turning the main road or 2 to 3 RPM results from the pump turning 20 to 45 RPM. Think of a better way, one...
Forum: Rotorheads
20th Jul 2023, 22:26
Replies: 25
Views: 5,606
Posted By CTR

Take a look at the schematic for reference. For...

Take a look at the schematic for reference. For the return filter, you are mostly correct. But for the pressure filter, it will suck debris through the pump and push it into the return system...
Forum: Rotorheads
19th Jul 2023, 18:54
Replies: 25
Views: 5,606
Posted By CTR

If you check the full 429 schematic (you cut off...

If you check the full 429 schematic (you cut off the right half), you will see the check valve I referenced that can cause cavitation located at the base of the reservoir can.
Forum: Rotorheads
19th Jul 2023, 14:12
Replies: 25
Views: 5,606
Posted By CTR

Reservoir Check Valves

As may have already been mentioned, turning the rotor backwards will cause gearbox driven hydraulic pumps to backflush the filters. This will push debris into the hydraulic system, and flight control...
Forum: Rotorheads
6th Jul 2023, 17:52
Replies: 21
Views: 11,045
Posted By CTR

What Components are Behind Schedule?

Not meaning to sound negative, but my experience with new aircraft designs is that the paint is not applied until after first flight. This is for two reasons;

1) Paint is not required to achieve a...
Forum: Rotorheads
13th Jun 2023, 13:51
Replies: 40
Views: 5,465
Posted By CTR

FAA Floats Certification Path for AW609 Tiltrotor

The eVTOL startups are dreading the prospect of being held to the same stringent standard for certification as the 609. “It appears the FAA intends to certify the AW609 as a special class aircraft...
Forum: Rotorheads
4th Jun 2023, 19:05
Replies: 40
Views: 5,465
Posted By CTR

I believe Bell is basing their design on the more...

I believe Bell is basing their design on the more successful SO 1221 Djinn cold tip jet propulsion applied to a gyrocopter.


https://en.wikipedia.org/wiki/SNCASO_SO.1221_Djinn
Forum: Rotorheads
4th Jun 2023, 14:00
Replies: 40
Views: 5,465
Posted By CTR

SplineDrive, Perhaps the revival time for a...

SplineDrive,

Perhaps the revival time for a tip jet may have come ;-)

https://cimg2.ibsrv.net/gimg/pprune.org-vbulletin/679x910/img_6502_6cf28830641164c52a78dbdf244cecf854584ddb.jpeg
Bell...
Forum: Rotorheads
4th Jun 2023, 13:10
Replies: 40
Views: 5,465
Posted By CTR

60FltMech, First, thanks for starting this...

60FltMech,

First, thanks for starting this thread, this site has become dry of new topics of late.

Many people don’t realize that the FAA FARs are only the equivalent of a cover page....
Forum: Rotorheads
23rd May 2023, 10:00
Replies: 268
Views: 52,796
Posted By CTR

Stuart, To each their own. Humor is a very...

Stuart,

To each their own. Humor is a very personal thing. I however, found it hilariously funny in a Steinfeld episode way. It was also almost spot on accurate in the engineering technical...
Forum: Rotorheads
22nd May 2023, 19:29
Replies: 268
Views: 52,796
Posted By CTR

Hitler Reacts to the Bell V-280 winning FLRAA.

This is the first I ever saw this type of parody humor. When playing the video on a phone, you may need to hold the phone vertically to see the full image.

All the audio is in German, but the...
Forum: Rotorheads
20th May 2023, 20:23
Replies: 268
Views: 52,796
Posted By CTR

What Lockheed and Boeing lack in engineering...

What Lockheed and Boeing lack in engineering successes, they make up with a strong lobbying presence in Washington, and US representatives willing to bend to their will.
Forum: Rotorheads
19th May 2023, 10:17
Replies: 268
Views: 52,796
Posted By CTR

Wet versus Dry

Another large benefit of a wet clutch over a dry clutch is more predictable coefficient of friction. The highest risk of damage in this clutch application is during engagement with the main rotors...
Forum: Rotorheads
16th May 2023, 13:36
Replies: 268
Views: 52,796
Posted By CTR

CC, I concur your analysis, but I believe...

CC,

I concur your analysis, but I believe Sikorsky had dual path to winning in their strategy.

One path, was as you stated, hope that you can work out the X-2 technology for a Defiant size...
Forum: Rotorheads
29th Apr 2023, 22:49
Replies: 268
Views: 52,796
Posted By CTR

Commando Cody, My friends told me the same Boeing...

Commando Cody, My friends told me the same Boeing departure story. There’s also a follow up story.

After the Boeing FLRAA split, Bell approached Boeing with an offer that they build the fuselage...
Forum: Rotorheads
29th Apr 2023, 22:12
Replies: 268
Views: 52,796
Posted By CTR

Both FLRAA teams were partially funded to build...

Both FLRAA teams were partially funded to build prototypes by the US Army. Sikorsky/Boeing were awarded approximately 15% more than Bell was. The remainder of the funding required was ponied up by...
Showing results 1 to 35 of 282
 
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