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Search: Posts Made By: SansAnhedral
Showing results 1 to 35 of 79
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Forum: Rotorheads
8th Jul 2022, 20:56
Replies: 488
Views: 209,130
Posted By SansAnhedral

A lot to unpack here, least of which is my...

A lot to unpack here, least of which is my sneaking suspicion that we were just graced by a post from an esteemed Sikorsky test pilot.

Based upon the commentary above, it would seem that there is...
Forum: Rotorheads
7th Jul 2022, 20:13
Replies: 488
Views: 209,130
Posted By SansAnhedral

True, at 6000 pounds the X2 AVC did not saturate...

True, at 6000 pounds the X2 AVC did not saturate and maintained right around 0.5 IPS in all directions.

Its unfortunate that a practical/useful platform using X2 technology requires about minimum...
Forum: Rotorheads
7th Jul 2022, 17:49
Replies: 488
Views: 209,130
Posted By SansAnhedral

A couple of other details that have not been...

A couple of other details that have not been discussed in this thread re:RaiderX gull wing door weapons deployment:

1. The entire rack with stores is hanging from the single-cantilever door, which...
Forum: Rotorheads
24th Jul 2019, 16:00
Replies: 488
Views: 209,130
Posted By SansAnhedral

It seems abundantly clear that in Bill's and...

It seems abundantly clear that in Bill's and Sikorsky repeated attempts to downplay the incident with the media, numerous reporters are understandably interpreting the blade contact as being a result...
Forum: Rotorheads
26th Jun 2019, 15:01
Replies: 488
Views: 209,130
Posted By SansAnhedral

Wait, 55 flight hours in 4 years of flight...

Wait, 55 flight hours in 4 years of flight testing? :sad:
Forum: Rotorheads
2nd May 2019, 14:54
Replies: 488
Views: 209,130
Posted By SansAnhedral

Ah I see. Thanks for the correction John, I got...

Ah I see. Thanks for the correction John, I got the "low gain" quote from the Sikorsky Archives article.
Forum: Rotorheads
1st May 2019, 19:54
Replies: 488
Views: 209,130
Posted By SansAnhedral

True, they were somewhat opposite in respect (too...

True, they were somewhat opposite in respect (too low gains (https://www.sikorskyarchives.com/S-69%20(XH-59A).php) in XH-59 vs 2.5x cyclic oversensitivity in S-97 in transition), but still overall...
Forum: Rotorheads
1st May 2019, 14:31
Replies: 488
Views: 209,130
Posted By SansAnhedral

Looks like the full factual NTSB report was...

Looks like the full factual NTSB report was released on the S97 "hard landing" back in 2017.

5 seconds of roll oscillations up to 60 degrees (!) followed by rotor intermeshing and destruction....
Forum: Rotorheads
4th Oct 2018, 14:07
Replies: 488
Views: 209,130
Posted By SansAnhedral

Well this sounds interesting. "Low...

Well this sounds interesting.

"Low acoustics" in high speed mode (skip to 1:34): https://www.youtube.com/watch?v=Elh0IM7Zp2U&t=94s

High speed flyby from the 8/1 video:...
Forum: Rotorheads
3rd Aug 2018, 15:47
Replies: 488
Views: 209,130
Posted By SansAnhedral

Here is how serious the Army seems about actually...

Here is how serious the Army seems about actually going though with FVL CS3 :rolleyes:

https://insidedefense.com/insider/army-announces-potential-black-hawk-buy
Forum: Rotorheads
23rd Jul 2018, 18:18
Replies: 488
Views: 209,130
Posted By SansAnhedral

The low thrust line mounting of the pusher on the...

The low thrust line mounting of the pusher on the SB1 and S97 would also preclude any sort of flared landing or autorotation without incurring damage to the prop, whether it is disengaged or not.
Forum: Rotorheads
2nd Jul 2018, 14:16
Replies: 488
Views: 209,130
Posted By SansAnhedral

In retrospect, it appears it was dangling the big...

In retrospect, it appears it was dangling the big carrot (4000 aircraft UH-60/AH-64 replacement) to get the OEMs to invest and demonstrate their technology. It also made more sense at the time...
Forum: Rotorheads
25th Jun 2018, 13:06
Replies: 488
Views: 209,130
Posted By SansAnhedral

I saw this coming over 3 years ago ...

I saw this coming over 3 years ago

https://www.pprune.org/rotorheads/524130-s97-raider-4.html#post8992734
Forum: Rotorheads
22nd Jun 2018, 14:00
Replies: 488
Views: 209,130
Posted By SansAnhedral

Did it actually fly for a full 90 minutes? That's...

Did it actually fly for a full 90 minutes? That's pretty amazing. That would be almost 10% of the entire flight time that ship 1 saw in its over 2 years worth of flight test.
Forum: Rotorheads
15th Sep 2017, 15:18
Replies: 488
Views: 209,130
Posted By SansAnhedral

Lockheed Martin Reaffirms Support For Sikorsky?s...

Lockheed Martin Reaffirms Support For Sikorsky?s Raider | Defense content from Aviation Week (http://aviationweek.com/defense/lockheed-martin-reaffirms-support-sikorsky-s-raider)
Forum: Rotorheads
11th Sep 2017, 19:12
Replies: 488
Views: 209,130
Posted By SansAnhedral

S-97 Raider sustained ?substantial damage' in...

S-97 Raider sustained ?substantial damage' in crash, but program moves forward...
Forum: Rotorheads
21st Aug 2017, 14:21
Replies: 488
Views: 209,130
Posted By SansAnhedral

While shaking the proverbial trees among my...

While shaking the proverbial trees among my industry peers for info on the Raider incident, I was told in passing about the tail rotor prop chucking a blade in the test pit on an iron bird rig a...
Forum: Rotorheads
18th Aug 2017, 18:50
Replies: 488
Views: 209,130
Posted By SansAnhedral

Anyone hear any news about possible causes in the...

Anyone hear any news about possible causes in the last couple of weeks? Component failure, computer/software issues, etc?

Perhaps it threw a pusher prop blade like the iron bird did a while back?...
Forum: Rotorheads
3rd Aug 2017, 18:27
Replies: 488
Views: 209,130
Posted By SansAnhedral

[/quote] https://i.imgur.com/s5fWKok.png ...

[/quote]

https://i.imgur.com/s5fWKok.png

https://i.imgur.com/RwDNhDZ.png

https://i.imgur.com/y2zOH6W.png

https://i.imgur.com/150dfsr.png
Forum: Rotorheads
2nd Aug 2017, 20:46
Replies: 488
Views: 209,130
Posted By SansAnhedral

Finally some news on the S-97....but not the kind...

Finally some news on the S-97....but not the kind I'm sure Sikorsky prefers. "Hard landing from hover". Crew safe thankfully.

S-97 Raider helicopter makes a hard landing at the Sikorsky...
Forum: Rotorheads
11th May 2017, 16:46
Replies: 488
Views: 209,130
Posted By SansAnhedral

The likely argument will be that converting from...

The likely argument will be that converting from a HOGE hover and accelerating to climb over the same duration for a greater ascent rate would meet the intended performance requirement.
Forum: Rotorheads
11th May 2017, 15:40
Replies: 488
Views: 209,130
Posted By SansAnhedral

AW themselves (and Bell prior) estimated...

AW themselves (and Bell prior) estimated 2500-3000 fpm climb rate publicly (http://www.ainonline.com/aviation-news/aerospace/2012-02-11/aw609-finally-ready-its-close), and with quite a bit of flight...
Forum: Rotorheads
10th May 2017, 16:55
Replies: 488
Views: 209,130
Posted By SansAnhedral

Curious where you get the idea that the 609 is...

Curious where you get the idea that the 609 is limited to 1500 fpm climb rate.
Forum: Rotorheads
9th May 2017, 20:19
Replies: 488
Views: 209,130
Posted By SansAnhedral

At AHS today, Mark Miller from SAC mentioned the...

At AHS today, Mark Miller from SAC mentioned the S-97 has 18 total flight hours to date in 13 flights, which is over the course of 2 years.

Also disclosed they have attained 150kt in level flight...
Forum: Rotorheads
8th May 2017, 15:17
Replies: 488
Views: 209,130
Posted By SansAnhedral

Climb no slower?...

Climb no slower? (https://www.verticalmag.com/features/20112-flying-the-v-22-html/) The climb rate in airplane mode is not matched by conventional helicopters, and that's precisely what riff was...
Forum: Rotorheads
3rd May 2017, 16:04
Replies: 488
Views: 209,130
Posted By SansAnhedral

I've debated the following: The Raider...

I've debated the following:


The Raider is the upper limit of the ABC technology scalability that will still meet some of its performance goals versus conventional helicopters
Even at S-97...
Forum: Rotorheads
1st May 2017, 21:21
Replies: 488
Views: 209,130
Posted By SansAnhedral

As if you didn't know...not exactly "A"...

As if you didn't know...not exactly "A" (singular) flexbeam, more akin to a beefy composite TT strap or loop.

It really depends on what one considers a "flexbeam" semantically. In the traditional...
Forum: Rotorheads
1st May 2017, 15:44
Replies: 488
Views: 209,130
Posted By SansAnhedral

It absolutely is, and the flexbeams are what I...

It absolutely is, and the flexbeams are what I believe have either failed or been giving them issues hence some rumored new builds. Rumor also has it that next month is supposed to finally be higher...
Forum: Rotorheads
28th Apr 2017, 17:51
Replies: 488
Views: 209,130
Posted By SansAnhedral

We are actually in agreement on the bulk of what...

We are actually in agreement on the bulk of what is being discussed from a theoretical standpoint, however the idea that one can actually leverage existing (high) modulus materials used on the X2 and...
Forum: Rotorheads
28th Apr 2017, 14:00
Replies: 488
Views: 209,130
Posted By SansAnhedral

I mentioned the quad in parentheses as it was...

I mentioned the quad in parentheses as it was basically the only feasible solution that did not require the implementation of some very low TRL items.

TR75 relies on some very dubious tuning...
Forum: Rotorheads
27th Apr 2017, 20:50
Replies: 488
Views: 209,130
Posted By SansAnhedral

True, but the army was also reeling from the...

True, but the army was also reeling from the dumpster fire that was the AH-56 program. So I would argue their taste for rigid rotors was not all that well developed.

I've not seen anything...
Forum: Rotorheads
27th Apr 2017, 20:41
Replies: 488
Views: 209,130
Posted By SansAnhedral

Spline claims that: Exactly how do you...

Spline claims that:



Exactly how do you propose you achieve stiffness for the same strain within a linearly scaled aero envelope without increasing structure and in turn weight?

An increase...
Forum: Rotorheads
27th Apr 2017, 18:56
Replies: 488
Views: 209,130
Posted By SansAnhedral

Calculations for static beams don't account for...

Calculations for static beams don't account for aeroelastic tuning concerns, effective airfoil shapes that must fully contain the structure, nor mast/hub sizing for the fixed end of your cantilever.
Forum: Rotorheads
27th Apr 2017, 17:51
Replies: 488
Views: 209,130
Posted By SansAnhedral

Well for JHL, the program office actually had...

Well for JHL, the program office actually had settled on a (quad) tiltrotor solution only - it was determined it was basically the only technology that could meet the requirements. It will be...
Forum: Rotorheads
27th Apr 2017, 16:29
Replies: 488
Views: 209,130
Posted By SansAnhedral

The ABC versus tiltrotor competition of the 70s...

The ABC versus tiltrotor competition of the 70s used craft (XH-59 and XV-15) sized below what is being compared today (SB>1 and V-280). At the time, Sikorsky used to illustrate larger versions of the...
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