Go Back  PPRuNe Forums > Search Forums
Reload this Page >

Search Results

 
Search: Posts Made By: SansAnhedral
Showing results 1 to 25 of 646
Search took 0.16 seconds.
Forum: Rotorheads
15th Oct 2020, 18:21
Replies: 220
Views: 78,291
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: 220
Views: 78,291
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: 45
Views: 9,418
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: 45
Views: 9,418
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: 45
Views: 9,418
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: 220
Views: 78,291
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: 220
Views: 78,291
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: 220
Views: 78,291
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: 220
Views: 78,291
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: 5,014
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: 5,014
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: 5,014
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: 5,014
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: 5,014
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: 5,014
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: 220
Views: 78,291
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: 3,302
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: 220
Views: 78,291
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...
Forum: Rotorheads
26th Mar 2020, 13:12
Replies: 48
Views: 7,047
Posted By SansAnhedral

FTFY Bring on the bailouts.

FTFY

Bring on the bailouts.
Forum: Rotorheads
3rd Mar 2020, 15:50
Replies: 48
Views: 7,047
Posted By SansAnhedral

(Checks calendar) Today isn't 1 April. ...

(Checks calendar)

Today isn't 1 April.

Wow. As shown that's.....not going to work.
Forum: Rotorheads
2nd Mar 2020, 20:09
Replies: 33
Views: 6,075
Posted By SansAnhedral

I couldn't find a decent 3D silhouette of the...

I couldn't find a decent 3D silhouette of the Tiger that matched the rest, but the AW was even closer with its slightly lower pylon
Forum: Rotorheads
2nd Mar 2020, 14:19
Replies: 33
Views: 6,075
Posted By SansAnhedral

I see this repeated ad nauseum.....and it really...

I see this repeated ad nauseum.....and it really makes absolutely no sense. If you actually look at 3-views of the RAH-66 and 360 they look almost nothing alike outside of the fenestron assembly and...
Forum: Rotorheads
28th Feb 2020, 19:58
Replies: 48
Views: 7,047
Posted By SansAnhedral

Agreed, that was my point. CTR above put a rigid...

Agreed, that was my point. CTR above put a rigid rotor on the list of Boeing FARA features. I don't see it.



Except the Cheyenne had a significant size lift offset wing, which the Boeing design...
Forum: Rotorheads
27th Feb 2020, 15:34
Replies: 48
Views: 7,047
Posted By SansAnhedral

I'm surprised nobody has pointed out how...

I'm surprised nobody has pointed out how ridiculous it would seem for Boeing to expect to achieve 180 kt cruise with a tall, open, unfaired hub and controls hanging out in the breeze as shown.
...
Forum: Rotorheads
25th Feb 2020, 14:01
Replies: 33
Views: 6,075
Posted By SansAnhedral

Notice in that PopSci article the illustration on...

Notice in that PopSci article the illustration on page 70. XH-59B was supposed to have that ducted pusher, dreamed up all the way back in the late 1960s. After seeing the A model in action, the Army...
Showing results 1 to 25 of 646
 


 
Forum Jump

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

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.