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Search: Posts Made By: SansAnhedral
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Forum: Rotorheads
8th Jul 2022, 20:56
Replies: 488
Views: 188,294
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: 188,294
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: 188,294
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
26th Apr 2022, 15:54
Replies: 5
Views: 2,096
Posted By SansAnhedral

My suspicions seem confirmed as based upon your...

My suspicions seem confirmed as based upon your response and the linked whitepapers (many of which I already have copies!) it appears you are teasing the creative implementation of gurney flaps with...
Forum: Rotorheads
25th Apr 2022, 17:20
Replies: 5
Views: 2,096
Posted By SansAnhedral

The "devices" you allude to, presumably are also...

The "devices" you allude to, presumably are also associated with the LE and TE mods you mentioned?

Other than local VGs, gurney tabs, TE/chord extension or profiling, or LE droop scabs - I am...
Forum: Rotorheads
20th Apr 2022, 20:03
Replies: 440
Views: 136,991
Posted By SansAnhedral

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

https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/858x726/ads_33_1c300664caf6b84b9ca2e638cef33a8b65cb57b3.png


Bell claimed that V-280 demonstrated Level 1 handling qualities in pitch, roll, and...
Forum: Rotorheads
19th Apr 2022, 18:47
Replies: 440
Views: 136,991
Posted By SansAnhedral

More refuels, and likely at minimum twice the...

More refuels, and likely at minimum twice the flight duration at much lower altitude. Not to mention the absolute beating any pax would take in those ships flying edgewise rotors for hours on end.
...
Forum: Rotorheads
18th Apr 2022, 18:17
Replies: 440
Views: 136,991
Posted By SansAnhedral

Where are you getting this mentality? See...

Where are you getting this mentality?

See 4:25 specifically, which comes after the footage of the XV-15 dogfighting the A-4 and OV-10

https://www.youtube.com/watch?v=uudfFbErYVU&t=259s
Forum: Rotorheads
18th Feb 2022, 14:51
Replies: 1
Views: 1,553
Posted By SansAnhedral

Joby N542AJ eVTOL crash

https://newatlas.com/aircraft/joby-crash-evtol/[h1]
Forum: Rotorheads
18th Jan 2022, 22:00
Replies: 440
Views: 136,991
Posted By SansAnhedral

Interesting that Sikorsky decided to show a video...

Interesting that Sikorsky decided to show a video ostensibly demonstrating "hover agility" while instead actually flying with not-insignificant flight speed. Rolling maneuvers coupled with forward...
Forum: Rotorheads
24th Nov 2021, 16:12
Replies: 6
Views: 3,230
Posted By SansAnhedral

From the article: [/color]

From the article:

[/color]
Forum: Rotorheads
11th Oct 2021, 17:55
Replies: 440
Views: 136,991
Posted By SansAnhedral

Just like what I presume we will start hearing...

Just like what I presume we will start hearing from the Sikorsky/Boeing camps in earnest - I think you are very much overselling the possible speed and range improvements from something like ITEP on...
Forum: Rotorheads
21st Jul 2021, 18:13
Replies: 440
Views: 136,991
Posted By SansAnhedral

The XH-59B was the intended follow on to the...

The XH-59B was the intended follow on to the XH-59A, and it had a ducted pusher prop design going all the way back to ca 1980.
...
Forum: Rotorheads
21st Jul 2021, 14:37
Replies: 440
Views: 136,991
Posted By SansAnhedral

The comment made in that post about yaw is...

The comment made in that post about yaw is interesting.

I think a historical knock on tiltrotor maneuverability was probably based on yaw rate, which is primarily affected by rotor flapping...
Forum: Rotorheads
29th Jun 2021, 15:35
Replies: 440
Views: 136,991
Posted By SansAnhedral

Lets not omit the old XH-59. One wonders what the...

Lets not omit the old XH-59. One wonders what the public perception of the X2 concept would be if the videos of both the XH-59 and S-97 prangs had made their way online like some of the old V-22...
Forum: Rotorheads
9th Jun 2021, 16:39
Replies: 440
Views: 136,991
Posted By SansAnhedral

Except that rotor height on a medium lift asset...

Except that rotor height on a medium lift asset that does not have the range to self-deploy makes it a non starter to fit into any airlift platform, much less a deck elevator and into a ship hanger.
Forum: Rotorheads
26th May 2021, 00:30
Replies: 440
Views: 136,991
Posted By SansAnhedral

How exactly do you plan an air assault mission to...

How exactly do you plan an air assault mission to land a Hercules without an airstrip? That argument falls flat on its face instantaneously.

You also forgot about range, unsurprisingly. That has...
Forum: Rotorheads
12th May 2021, 15:55
Replies: 440
Views: 136,991
Posted By SansAnhedral

Claiming 500 hours is just like the claim that...

Claiming 500 hours is just like the claim that the S-97 can cruise at 220kt....or that any of the X-2 ships are capable of low speed agility Level 1 HQ....or can perform level body...
Forum: Rotorheads
12th May 2021, 15:47
Replies: 440
Views: 136,991
Posted By SansAnhedral

This seems a rather silly thing to try and poke...

This seems a rather silly thing to try and poke at.

In a (very rare) defilade-type position you describe, the larger and lower spinning rotor of a conventional helicopter causes essentially the...
Forum: Rotorheads
11th May 2021, 17:40
Replies: 440
Views: 136,991
Posted By SansAnhedral

So, is the consensus that the Defiant flight test...

So, is the consensus that the Defiant flight test is over, and the aircraft was probably grounded even before 2021?

If that really is true, the entire program smacks of a mind-boggling study of...
Forum: Rotorheads
24th Feb 2021, 19:28
Replies: 11
Views: 2,637
Posted By SansAnhedral

The collective stick tube on the 505 is actually...

The collective stick tube on the 505 is actually designed and built by Mecaer Aviation Group in Italy for Bell
Forum: Rotorheads
6th Jan 2021, 14:57
Replies: 440
Views: 136,991
Posted By SansAnhedral

Sorry, but this has been shown in flight testing...

Sorry, but this has been shown in flight testing to be demonstrably false.

Of course, Sikorsky also claims the same thing with Defiant, but over 5+ years of trickled flight testing neither it nor...
Forum: Rotorheads
15th Oct 2020, 18:21
Replies: 440
Views: 136,991
Posted By SansAnhedral

You're right. Assuming linear was probably being...

You're right. Assuming linear was probably being generous on a fuselage+rotor like SB1.

https://iili.io/3HsAZJ.png

Even the hotrod low drag/FE X2TD fuselage power required slopes up with...
Forum: Rotorheads
15th Oct 2020, 15:15
Replies: 440
Views: 136,991
Posted By SansAnhedral

Interesting extrapolation using only one data...

Interesting extrapolation using only one data point.

Lets establish a curve based upon Sikorsky's own statements:
...
Forum: Rotorheads
1st Oct 2020, 20:58
Replies: 62
Views: 18,842
Posted By SansAnhedral

What planet do you live on? I'm sure...

What planet do you live on?



I'm sure that's comforting to the families of the 17 victims of Cougar 91, or the luckier CHC crew the year before.

But its still an order of magnitude below the...
Forum: Rotorheads
1st Oct 2020, 17:58
Replies: 62
Views: 18,842
Posted By SansAnhedral

Simply because this particular incident didn't...

Simply because this particular incident didn't lead to an actual full oil-out condition since they were already on approach (it would only have been a matter of time with the leak as described)...
Forum: Rotorheads
1st Oct 2020, 13:36
Replies: 62
Views: 18,842
Posted By SansAnhedral

Amazingly lucky. Once again reminding that S92A...

Amazingly lucky. Once again reminding that S92A gearbox is a deathtrap...it cannot actually run dry. Recall their Part 29 certification run-dry "extremely remote" clause basis was on the oil leak...
Forum: Rotorheads
8th Sep 2020, 15:48
Replies: 440
Views: 136,991
Posted By SansAnhedral

Firstly, that was not a flight of (an actual FVL...

Firstly, that was not a flight of (an actual FVL aircraft) Defiant. Secondly, I must have missed the part in there where Charlie was permitted to make a single comment about the Raider flight...
Forum: Rotorheads
1st Sep 2020, 14:47
Replies: 440
Views: 136,991
Posted By SansAnhedral

Until they achieve and demonstrate a single...

Until they achieve and demonstrate a single promised performance metric, or even allow a non-company pilot in the thing to objectively assess the vibration, I would say the jury is still firmly out...
Forum: Rotorheads
28th Aug 2020, 15:27
Replies: 440
Views: 136,991
Posted By SansAnhedral

Hey look, another 180 kt flight. ...

Hey look, another 180 kt flight.

https://www.youtube.com/watch?v=mUKEOfa8RQc[h1]


Lets update the quote list!
Forum: Rotorheads
19th Aug 2020, 14:57
Replies: 440
Views: 136,991
Posted By SansAnhedral

Seems Sikorsky's own demonstration flights have...

Seems Sikorsky's own demonstration flights have implied that. After reaching barely over 200 kt in Sept 2018, they subsequently have flown progressively slower in their big-to-do demo flights - only...
Forum: Rotorheads
23rd Jul 2020, 17:25
Replies: 28
Views: 5,660
Posted By SansAnhedral

Your dissertation comes off as somewhat alarmist...

Your dissertation comes off as somewhat alarmist and seems to overlook a few very pertinent points that are common in large OEM blade design:

1. Blade designs always include bond test coupon...
Forum: Rotorheads
20th Jul 2020, 19:49
Replies: 28
Views: 5,660
Posted By SansAnhedral

Resin technology has progressed a great deal...

Resin technology has progressed a great deal since the early days of composites in the 70s. Much of the experience that the older crowd has with carbon composites is with older fibers and first...
Forum: Rotorheads
19th Jul 2020, 20:18
Replies: 28
Views: 5,660
Posted By SansAnhedral

1. Largely isotropic materials like classic...

1. Largely isotropic materials like classic metallics (even forged parts) are inherently less weight efficient for a given design than composites that take advantage of the orthotropic structural...
Forum: Rotorheads
15th Jul 2020, 18:32
Replies: 28
Views: 5,660
Posted By SansAnhedral

Wood was the original composite material!

Wood was the original composite material!
Showing results 1 to 35 of 668
 


 
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