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Search: Posts Made By: JohnDixson
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Forum: Rotorheads
1st Nov 2013, 20:25
Replies: 648
Views: 220,968
Posted By JohnDixson

Hover Aids

Asked and answered. Thanks. Given the down wash velocity and the looks of the sand cloud, I imagine the system gets some practical usage.
Forum: Rotorheads
1st Nov 2013, 16:37
Replies: 648
Views: 220,968
Posted By JohnDixson

Hover Aids

Sans, does the V-22 have displays /autopilot functionality for approach to hover, auto hover and landing from hover thusly?
Forum: Rotorheads
23rd Jul 2012, 16:02
Replies: 648
Views: 220,968
Posted By JohnDixson

Gun Lift

Jack, re-read my post. Answers to your queries are there.

I didn't remember the details either, so I called him.

Thanks,
John
Forum: Rotorheads
23rd Jul 2012, 00:52
Replies: 648
Views: 220,968
Posted By JohnDixson

Cost

Tcabot,

My post reads $14.5M for an international version of the M. That is the unit price for the aircraft and everything in it. Pricing of spares, training and the like is separate, and subject...
Forum: Rotorheads
20th Jul 2012, 18:21
Replies: 648
Views: 220,968
Posted By JohnDixson

155mm Lift

Chris had an L model and the lift was done with a USMC gun at Camp Lejeune. His weight and balance had him at around 22000 ( i.e., half fuel ). Your comments are correct re the sling limits: above 8K...
Forum: Rotorheads
19th Jul 2012, 14:58
Replies: 648
Views: 220,968
Posted By JohnDixson

155mm Lift

Lonewolf,

Not in practice to my knowledge. SA ( Chris Geanacopoulos piloting) did it with an L model just to " get on the board " so to speak. Hook position in UH-60 is at center of lift between...
Forum: Rotorheads
19th Jul 2012, 13:35
Replies: 648
Views: 220,968
Posted By JohnDixson

El Cheapo

Now Sans,

Your quote: " Bottom line is the C-2 isn't an el-cheapo stripper UH-60 at $20 million a pop " is a bit off the mark.

Actually, the available international version of the UH-60M is...
Forum: Rotorheads
18th Jul 2012, 16:33
Replies: 648
Views: 220,968
Posted By JohnDixson

Slopes and Thrust Vector

SAS, your recollection of the limits re the CH-47A speed trim limits and results of mis-application in manual mode matches mine. Only point I was getting at is that the tilting of the thrust vector...
Forum: Rotorheads
17th Jul 2012, 19:38
Replies: 648
Views: 220,968
Posted By JohnDixson

CH-47 Lingo

SAS,

McP beeping nacelles forward in a hover isn't awfully different than manually beeping the CH-47 speed trim actuators forward in hover, am I correct?

Thanks,
John
Forum: Rotorheads
16th Jul 2012, 13:52
Replies: 648
Views: 220,968
Posted By JohnDixson

Slopes

Lonewolf, part of the UTTAS eval was to train 10 Army pilots from the 101st in the aircraft ( Boeing did as well with theirs ). Part of that syllabus was to do the entire slope envelope. The Army...
Forum: Rotorheads
15th Jul 2012, 00:58
Replies: 648
Views: 220,968
Posted By JohnDixson

McPave

I see your point.

With regard to rearward or nose down slope landing conditions, can the pilot use full aft nacelle?

Nothing inherently wrong ( at least by comparison with pure helicopter...
Forum: Rotorheads
14th Jul 2012, 17:44
Replies: 648
Views: 220,968
Posted By JohnDixson

McPave

Thanks for your response.

As to the last question: what design requirement led to the final aft nacelle range put into the machine, allow me to use the original UH-60 Army RFP ( request for...
Forum: Rotorheads
13th Jul 2012, 22:13
Replies: 648
Views: 220,968
Posted By JohnDixson

V-22 Farnborough

Thanks for the response, McPave. I did notice that the nacelles never went aft, ( and thought that perhaps there was some sort of restriction in their use under those circumstances ) and now that you...
Forum: Rotorheads
12th Jul 2012, 21:51
Replies: 648
Views: 220,968
Posted By JohnDixson

V-22 at Farnborough

Tcabot113 added to the video link:

"The V-22 looks pretty good here. Notice no pitch down, roll off or whatever the latest BS is."

Assuming the video link is a tape of the V-22 demo performance...
Forum: Rotorheads
29th Jun 2012, 17:00
Replies: 648
Views: 220,968
Posted By JohnDixson

SA Part on AH-64

Sans, remember that the stabilator was not a part of the original AH design, so when they decided on having one, the Army could quite properly ( the UH-60 design now being in the public domain, so to...
Forum: Rotorheads
28th Jun 2012, 17:47
Replies: 648
Views: 220,968
Posted By JohnDixson

Grenada etc.

Tcabot,

Not sure I recall the accidents in their proper chronological order, but two Army accidents from that exact period stuck in my mind, and one that occurred at Sikorsky.

One occurred at...
Forum: Rotorheads
27th Jun 2012, 21:16
Replies: 648
Views: 220,968
Posted By JohnDixson

Rt Pedal/Tandem Takeoff

SAS, in 1963 I was bootlegging an H-21 checkout at Mother Rucker and was lucky to have a recent returnee from the delta as an instructor. Taught that exact same takeoff "when you're out of ideas and...
Forum: Rotorheads
27th Jun 2012, 16:35
Replies: 648
Views: 220,968
Posted By JohnDixson

VRS vis a vis Roll Off

I recall reading the article by Lt Col Gross, but just mentally pigeon-holed the roll-off events as instabilities related to the unsteady flow associated with VRS.

That was an underestimation...
Forum: Rotorheads
25th Jun 2012, 17:57
Replies: 648
Views: 220,968
Posted By JohnDixson

V-22 Eglin

Does the V-22 have voice or flight data recorders?

Failing that, do the digital flight control computers have a limited time memory function capability?

Thanks,
John Dixson
Forum: Rotorheads
25th Jun 2012, 12:20
Replies: 648
Views: 220,968
Posted By JohnDixson

V-22 Formation

SAS, your link makes for interesting reading.

Thanks,
John Dixson
Forum: Rotorheads
19th Jun 2012, 22:20
Replies: 648
Views: 220,968
Posted By JohnDixson

1996 53E Accident

This was a brand new aircraft on a production hover test flight. The rotating swashplate bearing ( also brand new ) overheated, failed, then as the pitch links were dragged so as to be non-vertical,...
Forum: Rotorheads
9th Apr 2012, 14:55
Replies: 648
Views: 220,968
Posted By JohnDixson

Bell Flight test

JeffG,

Did Bell Flight test document the REAL VRS envelope for those machines*, or did the flight manual entry arise due to " other considerations "? For instance, the legal department reviewers...
Forum: Rotorheads
9th Apr 2012, 13:55
Replies: 648
Views: 220,968
Posted By JohnDixson

Flight Manuals etc.

JeffG,

What flight manuals ( excepting the V-22 ) do you refer to? See my previous post re Sikorsky models.

21st,

At 285 ft AGL and -2500 fpm, one had best be either, getting ready to flare,...
Forum: Rotorheads
8th Apr 2012, 15:05
Replies: 648
Views: 220,968
Posted By JohnDixson

Chinook Handling

SAS,

I only used the Chinook as a handling qualities analogy with regard to the Prouty comment.

With regard to your first paragraph, it reminded me of comments made by Jim Campbell, Boeing test...
Forum: Rotorheads
7th Apr 2012, 19:24
Replies: 648
Views: 220,968
Posted By JohnDixson

Prouty and 40/800

Good post, Matari. It brings up other writings by Ray Prouty:

In the R/W article ( could not get to the associated figures, unfortunately ), Mr. prouty concentrates on the V-22 aerodynamics,...
Forum: Rotorheads
6th Apr 2012, 14:26
Replies: 648
Views: 220,968
Posted By JohnDixson

The Dreaded 40/800 Boundary

It used to be that Army flight school included, in the second half of the curriculum at Ft Rucker, a demonstration of " settling with power ", which, when one listened to the verbal description, was...
Forum: Rotorheads
2nd Apr 2012, 22:16
Replies: 648
Views: 220,968
Posted By JohnDixson

Flight Manual Restrictions?

I could not recall such a restriction in any Sikorsky Manual, but since I retired a few years ago, I called a couple of still active pilots at SA this morning. Starting with the 53E and continuing...
Forum: Rotorheads
29th Mar 2012, 20:29
Replies: 648
Views: 220,968
Posted By JohnDixson

40/800 rule and 53E's

Sans,

Don't know the source of the article, but the section professing that the 40/800 VRS boundary applies to 53E's ( implying all helicopters ) and that a 53E, if flying the same profile, would...
Showing results 1 to 28 of 28


 
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