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Search: Posts Made By: SplineDrive
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Forum: Rotorheads
6th Jan 2021, 13:01
Replies: 233
Views: 85,412
Posted By SplineDrive

Both FLRAA competitors have agility requirements...

Both FLRAA competitors have agility requirements at the LZ similar to the UH-60 platform and the V-280 has demonstrated that capability. It also has the ability to rapidly drop from cruise to LZ and...
Forum: Rotorheads
1st Jan 2021, 14:48
Replies: 233
Views: 85,412
Posted By SplineDrive

Well, I was too optimistic when it came to...

Well, I was too optimistic when it came to predictions of last quarter progress for SB>1. I’m sure they’ll declare success if they ever reach 230 knots, but success should be measured against the...
Forum: Rotorheads
17th Dec 2020, 05:26
Replies: 147
Views: 14,223
Posted By SplineDrive

The R-22 main rotor head has delta-3, which...

The R-22 main rotor head has delta-3, which affects the phase angle between control input and rotor response. There are other factors that affect that angle, but if there is delta-3 involved, that...
Forum: Rotorheads
15th Dec 2020, 19:58
Replies: 147
Views: 14,223
Posted By SplineDrive

Just checked my Dr. Henry Velkoff text, and the...

Just checked my Dr. Henry Velkoff text, and the phenomenon is just as AC described it! 😂
Forum: Rotorheads
27th Nov 2020, 15:48
Replies: 233
Views: 85,412
Posted By SplineDrive

I guess “imminent” is longer than three months.

I guess “imminent” is longer than three months.
Forum: Rotorheads
12th Nov 2020, 17:21
Replies: 34
Views: 7,237
Posted By SplineDrive

This is the clearest explanation and the one I...

This is the clearest explanation and the one I learned. ☺️
Forum: Rotorheads
6th Nov 2020, 15:04
Replies: 20
Views: 2,282
Posted By SplineDrive

The complaint I’ve always heard was not Boeing’s...

The complaint I’ve always heard was not Boeing’s individual engineers and their contributions, but rather how their program managers assigned to the teams managed risk, schedule, mitigations, etc.
Forum: Rotorheads
5th Nov 2020, 16:39
Replies: 20
Views: 2,282
Posted By SplineDrive

Plenty of people remember Comanche... not all...

Plenty of people remember Comanche... not all engineers remember that teaming fondly.
Forum: Rotorheads
4th Nov 2020, 20:02
Replies: 20
Views: 2,282
Posted By SplineDrive

Anecdotally, the opposite was true at Sikorsky...

Anecdotally, the opposite was true at Sikorsky when engineers learned they’d be teaming with Boeing on SB>1.
Forum: Rotorheads
4th Nov 2020, 15:58
Replies: 20
Views: 2,282
Posted By SplineDrive

Oh, I’ve heard a few wistful dreams and...

Oh, I’ve heard a few wistful dreams and “what-ifs” about X-Wing over the years, but I think Sultan is just having fun, though... Sikorsky is “all-in” on X-2 technology. Not a wise strategy, but it is...
Forum: Rotorheads
19th Oct 2020, 00:13
Replies: 233
Views: 85,412
Posted By SplineDrive

Put me down for another press release in...

Put me down for another press release in mid-December highlighting the hundreds of ground turn hours accumulated on the test beds and "thousands" of hours of simulations in various integration labs...
Forum: Rotorheads
18th Oct 2020, 05:14
Replies: 233
Views: 85,412
Posted By SplineDrive

i read 23 hours in one of this week’s articles.

i read 23 hours in one of this week’s articles.
Forum: Rotorheads
17th Oct 2020, 17:33
Replies: 233
Views: 85,412
Posted By SplineDrive

It doesn't and to Lockheed's credit, I don't...

It doesn't and to Lockheed's credit, I don't think they have officially claimed it does, but some journalists have gotten "excited" about the 232 knot value.
Forum: Rotorheads
15th Oct 2020, 18:32
Replies: 233
Views: 85,412
Posted By SplineDrive

I don’t really think the data from press releases...

I don’t really think the data from press releases is sufficient to build any sort of credible speed-power polar, even for trash-talking purposes. The time required to advance another 6 knots is a...
Forum: Rotorheads
30th Sep 2020, 17:55
Replies: 233
Views: 85,412
Posted By SplineDrive

Honestly, other than that Sikorsky press/media...

Honestly, other than that Sikorsky press/media day, I can’t find an official looking requirement for 230 knots. Everything I can find says 250 knots as a threshold speed and 280 knots as objective....
Forum: Rotorheads
3rd Sep 2020, 20:07
Replies: 233
Views: 85,412
Posted By SplineDrive

53 knots below Raider’s target speed w/o...

53 knots below Raider’s target speed w/o pylons/weapons installed, but an important milestone for Sikorsky. Thanks for the link.
Forum: Rotorheads
3rd Sep 2020, 05:20
Replies: 233
Views: 85,412
Posted By SplineDrive

For a 4 bladed rotor system, 4P blade loads...

For a 4 bladed rotor system, 4P blade loads create 4P vertical shears at the hub. 3P and 5P blade loads get converted to 4P vibratory moments in the fixed system. Depending on where particular blade...
Forum: Rotorheads
2nd Sep 2020, 14:34
Replies: 233
Views: 85,412
Posted By SplineDrive

To get most of that advancing blade benefit,...

To get most of that advancing blade benefit, though, simply being a coaxial rotor system isn’t enough. You have to be able to carry large moments across the hub and hold what would normally be an...
Forum: Rotorheads
1st Sep 2020, 20:17
Replies: 233
Views: 85,412
Posted By SplineDrive

Maybe the U.S. Army doesn’t have a good dental...

Maybe the U.S. Army doesn’t have a good dental plan for their pilots.
Forum: Rotorheads
31st Aug 2020, 03:49
Replies: 233
Views: 85,412
Posted By SplineDrive

I guess beauty is in the eye of the beholder......

I guess beauty is in the eye of the beholder... took another look through patents and found what looks like the application for the SB>1 rotor hub. Compare the patent art with the first flight image...
Forum: Rotorheads
29th Aug 2020, 23:34
Replies: 233
Views: 85,412
Posted By SplineDrive

"A flight to achieve that speed goal is imminent"...

"A flight to achieve that speed goal is imminent" - Defiant Team 8/27/2020

Which speed goal? The bare-minimum Army requirement of 230 knots? Or the current speed goal of "closer to 250 knots" (so...
Forum: Rotorheads
17th Aug 2020, 15:41
Replies: 233
Views: 85,412
Posted By SplineDrive

It’s been “a few months” again... any news on...

It’s been “a few months” again... any news on progress?
Forum: Rotorheads
15th Jun 2020, 01:13
Replies: 147
Views: 54,661
Posted By SplineDrive

The OH-6 wasn't the only HHC testbed, either....

The OH-6 wasn't the only HHC testbed, either. Several manufacturers tried this vibration or L/De improving approach 40 years ago and there are exactly zero fielded aircraft with HHC rotor control...
Forum: Rotorheads
14th Jun 2020, 16:18
Replies: 147
Views: 54,661
Posted By SplineDrive

[/color][/url] CTR, my understanding of the...

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CTR, my understanding of the system is more recent than 2009, but I don’t have a source handy. I’ll dig around. The patent you linked didn’t really address where power comes from...
Forum: Rotorheads
13th Jun 2020, 18:52
Replies: 147
Views: 54,661
Posted By SplineDrive

CTR, a correction - the electrical power is...

CTR, a correction - the electrical power is generated in the rotating frame, not the stationary. This was done explicitly to avoid the reliability problems associated with sliprings. I suspect the...
Showing results 1 to 25 of 128
 


 
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