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Search: Posts Made By: SplineDrive
Showing results 1 to 35 of 44
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Forum: Rotorheads
4th Aug 2019, 14:27
Replies: 488
Views: 209,243
Posted By SplineDrive

I’ve got those reports on the S-67 somewhere, I...

I’ve got those reports on the S-67 somewhere, I recall they’re for the Army. They’re on one of the .mil data servers.
Forum: Rotorheads
1st Aug 2019, 04:08
Replies: 488
Views: 209,243
Posted By SplineDrive

A compounded RAH-66 would have a wing to help...

A compounded RAH-66 would have a wing to help offload the rotor as mu increases... that alone should enable the extra speed for FARA with a usable payload. At 180 knots, it wouldn’t need a pusher. I...
Forum: Rotorheads
28th Jul 2019, 14:58
Replies: 488
Views: 209,243
Posted By SplineDrive

I would classify it as an excellent teaching tool...

I would classify it as an excellent teaching tool for new HQ, control law, dynamics, and aerodynamics engineers 😉
Forum: Rotorheads
25th Jul 2019, 15:52
Replies: 488
Views: 209,243
Posted By SplineDrive

This one is easy... believe the NTSB.

This one is easy... believe the NTSB.
Forum: Rotorheads
26th Jun 2019, 12:07
Replies: 488
Views: 209,243
Posted By SplineDrive

An article a while back had the comment from the...

An article a while back had the comment from the Army stating something to the effect of “the Army knows quite a bit about the rigid coaxial configuration”... that may not be a good thing for...
Forum: Rotorheads
4th Oct 2018, 14:47
Replies: 488
Views: 209,243
Posted By SplineDrive

I think the nose down pass is main rotor thrust...

I think the nose down pass is main rotor thrust only, so a helo mode pass with the prop disengaged. There’s a nice side shot where you can see the exhaust gasses... as close as they are to the prop,...
Forum: Rotorheads
4th Oct 2018, 01:03
Replies: 488
Views: 209,243
Posted By SplineDrive

After a few months of quiet, some more progress...

After a few months of quiet, some more progress with S-97 AC2... finally exceeded 200 knots and demoed some various low speed maneuvers and some decent angle of bank, etc.

Sikorsky Raider Hits 200...
Forum: Rotorheads
4th Aug 2018, 17:57
Replies: 488
Views: 209,243
Posted By SplineDrive

Saw this link on HeliOps Facebook page......

Saw this link on HeliOps Facebook page... Hopefully a more complete video is released. If the video was shot from the ground, then presumably as much of the demo was done within eyesight as possible....
Forum: Rotorheads
3rd Jul 2018, 02:29
Replies: 488
Views: 209,243
Posted By SplineDrive

S-97 was sized to a mission spec closer to ARH,...

S-97 was sized to a mission spec closer to ARH, so it’s quite a bit less capable than the FVL CapSet 1 requirements, but FARA seems like it's possibly in between the two. I doubt S-97 meets the FARA...
Forum: Rotorheads
27th Jun 2018, 17:50
Replies: 488
Views: 209,243
Posted By SplineDrive

I doubt Boeing is pushing for Cap Set 1 to go...

I doubt Boeing is pushing for Cap Set 1 to go first. They’re not teamed with Sikorsky on the Cap Set 1 end of the FVL line and I am not aware of a Boeing internal platform that would fullfit the Cap...
Forum: Rotorheads
27th Jun 2018, 17:46
Replies: 488
Views: 209,243
Posted By SplineDrive

Yup... and the Army retired their scout aircraft...

Yup... and the Army retired their scout aircraft and are currently receiving new build mediums. Leading off with the CapSet3 medium aircraft never made much sense.
Forum: Rotorheads
14th Oct 2017, 15:24
Replies: 488
Views: 209,243
Posted By SplineDrive

Progress has certainly been slow, but we both...

Progress has certainly been slow, but we both know RAIDER has been out of the airport perimeter and done more than hover. As for schedule, we'll see.
Forum: Rotorheads
13th Oct 2017, 20:28
Replies: 488
Views: 209,243
Posted By SplineDrive

Right... I haven’t seen anything that indicates...

Right... I haven’t seen anything that indicates AC1 will fly again.

Since it seems clear that development has been slower than ideal, hopefully they can roll the changes made to AC1, over the...
Forum: Rotorheads
28th Sep 2017, 11:18
Replies: 488
Views: 209,243
Posted By SplineDrive

Sikorsky appears to be hiring in CT, TX, and WPB,...

Sikorsky appears to be hiring in CT, TX, and WPB, so perhaps they're willing to do all of the above. At this point, what's required to regression check and complete the second Raider aircraft is...
Forum: Rotorheads
16th Sep 2017, 22:16
Replies: 488
Views: 209,243
Posted By SplineDrive

Incorrect Flight State

... if the FCC was not in the correct flight mode, I suspect there was a substantial amount of excitement packed into the phrase "unable to stabilize the helicopter". Glad the rest of the systems...
Forum: Rotorheads
4th Aug 2017, 23:35
Replies: 488
Views: 209,243
Posted By SplineDrive

You know there’s a lack of public information...

You know there’s a lack of public information when we’re arguing over grammar, lol.
Forum: Rotorheads
3rd May 2017, 23:19
Replies: 488
Views: 209,243
Posted By SplineDrive

That is a very fair question, no doubt!

That is a very fair question, no doubt!
Forum: Rotorheads
3rd May 2017, 17:24
Replies: 488
Views: 209,243
Posted By SplineDrive

High speed SAR has been discussed before... at...

High speed SAR has been discussed before... at one point it was hoped that a 609 tiltrotor variant with a wider door and retractable hoist would be a good fit for the US Coast Guard. So he range and...
Forum: Rotorheads
30th Apr 2017, 18:24
Replies: 488
Views: 209,243
Posted By SplineDrive

Riff, while requiring a different flexbeam...

Riff, while requiring a different flexbeam arrangement than a conventional flexbeam rotor like AH-1Y/Z, RAH-66, or EC-135, a stiff out of plane rotor can have a flexbeam. The Sikorsky X-Wing used a...
Forum: Rotorheads
28th Apr 2017, 15:56
Replies: 488
Views: 209,243
Posted By SplineDrive

There is typically an inboard shear bearing...

There is typically an inboard shear bearing between the flexbeam and inboard end of the blade. Often a lag damper is installed there as well. The bearing transmits shears, allows for blade pitch and...
Forum: Rotorheads
28th Apr 2017, 15:34
Replies: 488
Views: 209,243
Posted By SplineDrive

Sans, when you double the rotor radius and hold...

Sans, when you double the rotor radius and hold solidity, blade number, and airfoil family constant, you get a fourth order increase in cross section stiffness as part of that scaling. Mass per unit...
Forum: Rotorheads
28th Apr 2017, 15:18
Replies: 488
Views: 209,243
Posted By SplineDrive

[QUOTE=Lonewolf_50;9755171]What about a...

[QUOTE=Lonewolf_50;9755171]What about a bearingless rotor?

A 'bearingless rotor' is rarely totally bearingless, but 'reduced bearing count rotor' doesn't sound as sexy. Same comment applies......
Forum: Rotorheads
27th Apr 2017, 19:04
Replies: 488
Views: 209,243
Posted By SplineDrive

I implicitly addressed airfoil cross sections by...

I implicitly addressed airfoil cross sections by holding them constant, blade tuning to similar fan plots is acheiveable across wide ranges of rotor diameters, and I explicitly addressed what is...
Forum: Rotorheads
27th Apr 2017, 17:56
Replies: 488
Views: 209,243
Posted By SplineDrive

Sans, running through the scaling math for beams,...

Sans, running through the scaling math for beams, it looks like that for a given number of blades, solidity, and load factor, the spacing between the rotors can indeed be a constant proportion as...
Forum: Rotorheads
26th Apr 2017, 18:05
Replies: 488
Views: 209,243
Posted By SplineDrive

ET, understanding of coaxial rotors isn't as thin...

ET, understanding of coaxial rotors isn't as thin on the ground as you suggest... it's not a new configuration, there's wind tunnel data, aeroelastic modeling, subscale rotor testing, and of course...
Forum: Rotorheads
25th Apr 2017, 18:16
Replies: 488
Views: 209,243
Posted By SplineDrive

Like most programs I've been attached to, my vote...

Like most programs I've been attached to, my vote is some flavor of B as the largest slice of the truth.
Forum: Rotorheads
21st Apr 2017, 18:02
Replies: 488
Views: 209,243
Posted By SplineDrive

CTR, I agree with Sans assessment of the...

CTR, I agree with Sans assessment of the situation.

As far as finances, both the helo divisions of Lockheed and Boeing are tiny compared to the entire corporation and in different divisions from...
Forum: Rotorheads
21st Apr 2017, 14:12
Replies: 488
Views: 209,243
Posted By SplineDrive

Right... and as a result, in the intervening...

Right... and as a result, in the intervening years, several generations of tiltrotors have been designed, with some being qualified and placed into service. The tiltrotor is obviously the more mature...
Forum: Rotorheads
21st Apr 2017, 03:54
Replies: 488
Views: 209,243
Posted By SplineDrive

Y'all are not trying to claim that the ABC and...

Y'all are not trying to claim that the ABC and tiltrotor concepts are at equivalent levels of maturity, are you?

Because THAT would be silly.
Forum: Rotorheads
20th Apr 2017, 18:25
Replies: 488
Views: 209,243
Posted By SplineDrive

Fair enough, but regardless of what the Defiant...

Fair enough, but regardless of what the Defiant managers claim, that is the more technically ambitious design compared to the relative maturity of the tiltrotor platform. It's not a surprise they're...
Forum: Rotorheads
20th Apr 2017, 11:20
Replies: 488
Views: 209,243
Posted By SplineDrive

We can also add the V-22, 609, 525, and even the...

We can also add the V-22, 609, 525, and even the relatively straightforward 429 to the late list. In fact, its a rare aircraft these days that comes in on time and even rarer to come in on time, on...
Forum: Rotorheads
19th Apr 2017, 18:06
Replies: 488
Views: 209,243
Posted By SplineDrive

http://www.defensenews.com/articles/defiant-delaye...

http://www.defensenews.com/articles/defiant-delayed-joint-multi-role-demonstrator-wont-fly-in-2017

Article admits what we've all suspected, Defiant is behind schedule. States Raider flew in March,...
Forum: Rotorheads
18th Apr 2017, 23:48
Replies: 488
Views: 209,243
Posted By SplineDrive

It seems safe to assume that they haven't met the...

It seems safe to assume that they haven't met the speed goal yet, otherwise it would be more prominently advertised. Still, the program continues. Looks good with the gear up and the slick engine...
Forum: Rotorheads
5th Apr 2017, 17:35
Replies: 488
Views: 209,243
Posted By SplineDrive

You won't find me being a huge champion of...

You won't find me being a huge champion of outsourcing critical dynamic components :-/
Forum: Rotorheads
30th Mar 2017, 16:05
Replies: 488
Views: 209,243
Posted By SplineDrive

Or they are just flying over the swamps of...

Or they are just flying over the swamps of Florida using it as a risk reduction tool for SB>1. It seems likely that they haven't met their flight test goals yet (I would expect a video and...
Showing results 1 to 35 of 44
 
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