Go Back  PPRuNe Forums > Search Forums
Reload this Page >

Search Results

 
Search: Posts Made By: SansAnhedral
Showing results 1 to 25 of 653
Search took 0.13 seconds.
Forum: Rotorheads
9th Jun 2021, 16:39
Replies: 297
Views: 100,982
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 2,452
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 63
Views: 17,723
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: 63
Views: 17,723
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: 63
Views: 17,723
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 297
Views: 100,982
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: 5,308
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: 5,308
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: 5,308
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: 5,308
Posted By SansAnhedral

Wood was the original composite material!

Wood was the original composite material!
Forum: Rotorheads
15th Jul 2020, 18:30
Replies: 28
Views: 5,308
Posted By SansAnhedral

Never implied it was utopioan, but after 15 years...

Never implied it was utopioan, but after 15 years of designing rotor blades, today I would never use metallic primary structure unless it was a design purely for cost (and not carrying humans).
Forum: Rotorheads
14th Jul 2020, 20:48
Replies: 28
Views: 5,308
Posted By SansAnhedral

To believe that a given metal blade design is...

To believe that a given metal blade design is inherently more robust than a properly designed composite version is patently laughable to any rotors engineer who has any real experience from the last...
Forum: Rotorheads
17th Jun 2020, 21:15
Replies: 297
Views: 100,982
Posted By SansAnhedral

[color=#222222]-Ken Eland 10/09/18 ...

[color=#222222]-Ken Eland 10/09/18


[color=#222222]-Ken Eland 10/15/19


-Bill Fell 2/20/20


-Bill Fell 6/16/20
Forum: Rotorheads
27th May 2020, 16:03
Replies: 17
Views: 3,509
Posted By SansAnhedral

The primary claims of the patent are really...

The primary claims of the patent are really stating the use of split winglets in general. Dihedral as shown on a helicopter rotor blade does not really make much sense at all, but since all the...
Forum: Rotorheads
13th May 2020, 15:11
Replies: 297
Views: 100,982
Posted By SansAnhedral

[color=#000000]That entire montage makes the...

[color=#000000]That entire montage makes the Defiant look wholly sluggish and ungainly, particularly in contrast to the videos of the V-280 performing low speed agility maneuvers. It's amazing that...
Showing results 1 to 25 of 653
 


 
Forum Jump

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.