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Search: Posts Made By: JohnDixson
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Forum: Rotorheads
18th Aug 2022, 18:29
Replies: 24
Views: 2,492
Posted By JohnDixson

Ummmm, that might be overselling artificial...

Ummmm, that might be overselling artificial stability additives. E,g., one fine day in Japan at the end of a demonstration mission, returning south from Hokkaido. Sunny day with a wind from the west,...
17th Aug 2022, 02:14
Replies: 29
Views: 8,599
Posted By JohnDixson

Any idea what the speed was for the maneuver and...

Any idea what the speed was for the maneuver and what sort of pitch rate the wing can provide ( thus Nz )?
Forum: Rotorheads
15th Aug 2022, 16:12
Replies: 42
Views: 7,493
Posted By JohnDixson

Re possible swashplate failure: We suffered one...

Re possible swashplate failure: We suffered one of those in 1996 with the first hover of a production 53E. High hover. Swashplate bearing failed-quick overheat and rotating part of swashplate slowed...
Forum: Rotorheads
6th Aug 2022, 12:01
Replies: 86
Views: 21,551
Posted By JohnDixson

Could not agree more with SAS, Crab,GM. Ther were...

Could not agree more with SAS, Crab,GM. Ther were a couple of factors in play here, historically ( maybe more than a couple? ). A lot of the “old heads “ considered SAS. AFCS etc as unnecessary,...
Forum: Rotorheads
28th Jul 2022, 14:22
Replies: 241
Views: 58,868
Posted By JohnDixson

Might have mentioned this previously, but with...

Might have mentioned this previously, but with the new blades I inquired as to whether the 23mm ballistic tests were repeated and they were.Same test requirement since the A model. Also for instance...
Forum: Rotorheads
4th Jul 2022, 10:57
Replies: 107
Views: 28,201
Posted By JohnDixson

No, SAS, that was not me in that movie. Crew was...

No, SAS, that was not me in that movie. Crew was Kurt Cannon Project Pilot on the 67 and Byron Graham, Ch. Engr. Pilot ( who had done the CH-53 loops/rolls movie with then Major Bob Guay, USMC ).
I...
Forum: Rotorheads
2nd Jul 2022, 14:21
Replies: 107
Views: 28,201
Posted By JohnDixson

SAS, I think the origination started with...

SAS, I think the origination started with Siegfried Hoffman, a test pilot at MBB. By 1982 at the Hanover airshow, world aerobatic ( helicopters ) champion Hauptman Karl Zimmerman* was doing the most...
Forum: Rotorheads
2nd Jul 2022, 12:51
Replies: 107
Views: 28,201
Posted By JohnDixson

I’ve been out of touch on this sort of detail,...

I’ve been out of touch on this sort of detail, but US military helos test specs for the structural demonstration series of maneuvers always included demo to -0.5 G*. ( and no, I don’t know how the...
17th Jun 2022, 16:17
Replies: 173
Views: 32,136
Posted By JohnDixson

SAS, good post, and you didn’t mention that your...

SAS, good post, and you didn’t mention that your C-rats were from the previous war.
Forum: Rotorheads
10th Jun 2022, 16:15
Replies: 16
Views: 1,149
Posted By JohnDixson

Had a chat with Sharris62 and have hopefully put...

Had a chat with Sharris62 and have hopefully put him in contact with two very experienced folk who can assist in his endeavor. Thanks to all who have assisted-it sounded like the direction he is...
Forum: Rotorheads
9th Jun 2022, 14:07
Replies: 16
Views: 1,149
Posted By JohnDixson

If so, LW, then they will be needing official and...

If so, LW, then they will be needing official and current data and will only be able to obtain that data from S A. Original A and L model Pids are “ interesting “ for background, but no longer define...
Forum: Rotorheads
9th Jun 2022, 12:58
Replies: 16
Views: 1,149
Posted By JohnDixson

FDR, in addition to the Flight Loads Survey data,...

FDR, in addition to the Flight Loads Survey data, ther were also 4 successive Structural demonstrations ( see AMCP 706-203 for required test data points ) during the initial and early years.
1. Pre...
Forum: Rotorheads
9th Jun 2022, 01:05
Replies: 16
Views: 1,149
Posted By JohnDixson

Sharris62 see PM Sharris62: Just advised...

Sharris62 see PM

Sharris62: Just advised that your PM box is full and cannot accept my PM with contact info.
Forum: Rotorheads
31st May 2022, 14:57
Replies: 31
Views: 6,552
Posted By JohnDixson

https://cimg2.ibsrv.net/gimg/pprune.org-vbulletin/...

https://cimg2.ibsrv.net/gimg/pprune.org-vbulletin/1539x1028/h_53_one_eng_departure_7592212c3829785784eacbe60137893fb901d57b.jpg
Iran 1972
CH-53D with minesweeping kit. Demo in Iran completed, and...
Forum: Rotorheads
28th May 2022, 10:05
Replies: 4
Views: 1,298
Posted By JohnDixson

Re the “ Coasties “: when the weather has the...

Re the “ Coasties “: when the weather has the rest of us deciding that the flying can wait a bit, they get to put on their gear and launch. An under-rated group of very fine folks. World-wide.
...
Forum: Rotorheads
23rd May 2022, 18:42
Replies: 4
Views: 1,721
Posted By JohnDixson

212: maybe they wanted an area fire weapon...

212: maybe they wanted an area fire weapon system?
Not serious-curious that they let out those videos.
Forum: Rotorheads
21st May 2022, 12:46
Replies: 241
Views: 58,868
Posted By JohnDixson

A lot will depend on the RAF mission description....

A lot will depend on the RAF mission description. If it is admin support, the 525 will compete well. If it involves combat requirements, the ballistic survivability and crashworthy requirements...
5th May 2022, 00:41
Replies: 74
Views: 20,696
Posted By JohnDixson

Thanks to SAS for a PM- could not recall the name...

Thanks to SAS for a PM- could not recall the name of what was, in the CH-47A I flew from 1963-65 called the Differential Collective Pitch system, whose function was similar to the Pittch Bias...
Forum: Rotorheads
2nd May 2022, 15:11
Replies: 440
Views: 135,540
Posted By JohnDixson

CTR quote: “Bringing this back around to...

CTR quote: “Bringing this back around to Helicopter’s. Why would a major prime enter into contract with impossible to meet requirements? Because that’s the way the game was played 40 years ago. Based...
Forum: Rotorheads
2nd May 2022, 14:48
Replies: 24
Views: 4,051
Posted By JohnDixson

There is a former USMC S-51 that was flown in the...

There is a former USMC S-51 that was flown in the Korean War, now completely refreshed to USMC original paint etc. Owned and flown by a former SA test pilot Alex Anduce. At least it was as of a...
Forum: Rotorheads
30th Apr 2022, 02:23
Replies: 39
Views: 7,070
Posted By JohnDixson

Wrench, any chance that DCU gets a collective...

Wrench, any chance that DCU gets a collective position signal?
Forum: Rotorheads
29th Apr 2022, 17:54
Replies: 39
Views: 7,070
Posted By JohnDixson

Is it possible the P&W engine controls...

Is it possible the P&W engine controls incorporated a history recorder of some sort and have some data to provide? Actually, the same goes for the SAS or autopilot if the aircraft has such.There is...
Forum: Rotorheads
29th Apr 2022, 11:45
Replies: 39
Views: 7,070
Posted By JohnDixson

FDR: comment not relevant to the accident ( I’m...

FDR: comment not relevant to the accident ( I’m sure ) but relevant to the numbers you posted, except for the turn part. In doing flight load survey data gathering, the flight test cards at SA always...
Forum: Rotorheads
22nd Apr 2022, 16:19
Replies: 440
Views: 135,540
Posted By JohnDixson

The USN qualification process* included a...

The USN qualification process* included a structural demonstration maneuver called “ Turn on a Spot “, the short description of which is: at a hover put in a pedal force of 180 lbs in each direction...
Forum: Rotorheads
21st Apr 2022, 15:12
Replies: 440
Views: 135,540
Posted By JohnDixson

Re CC Post 425: Just some additional...

Re CC Post 425:

Just some additional information re the refueling/self-deployment ability question. The original Army plans for deployment to Europe involved a lot of UH-60’s and there was/is a...
Forum: Rotorheads
21st Apr 2022, 11:51
Replies: 440
Views: 135,540
Posted By JohnDixson

Re CC Post 423. Comment: the low speed agility...

Re CC Post 423. Comment: the low speed agility requirements in existence when the UTTAS requirements were published might have been met by the UH-1! But there were other maneuverability requirements...
Forum: Rotorheads
20th Apr 2022, 22:36
Replies: 10
Views: 1,880
Posted By JohnDixson

h-n, it seems you face no problems integrating...

h-n, it seems you face no problems integrating into the local IFR structure. Have I misinterpreted the situation? But in any case, there has been significant discussion over time regarding the...
Forum: Rotorheads
20th Apr 2022, 16:45
Replies: 440
Views: 135,540
Posted By JohnDixson

RePost 407: ”I note the V-280 has already...

RePost 407:
”I note the V-280 has already demonstrated that it at least meets the Army's FLRAA low speed agility requirements, which exceed that of Huey and Black Hawk while as yet Defiant has not.”...
Forum: Rotorheads
17th Apr 2022, 10:14
Replies: 440
Views: 135,540
Posted By JohnDixson

Having been “ fairly close “ to both the Army ...

Having been “ fairly close “ to both the Army UTTAS and the Comanche Programs, it is important to note the effects of two absolutely different approaches taken by the Army in their management of...
Forum: Rotorheads
13th Apr 2022, 22:05
Replies: 440
Views: 135,540
Posted By JohnDixson

I failed to note another capability of the...

I failed to note another capability of the Comanche ducted fan: it was capable of sideward flight to 100 kts ( paced) . Pretty high bar for low speed directional control. So with all those savings...
Forum: Rotorheads
12th Apr 2022, 19:44
Replies: 440
Views: 135,540
Posted By JohnDixson

Now that you mentioned Comanche……er…..Invictus....

Now that you mentioned Comanche……er…..Invictus. What’s that adage? : “ Imitation is the sincerest form of flattery “ , or something like that. Curious that Invictus started out as , like a 100% look...
Forum: Rotorheads
7th Apr 2022, 14:46
Replies: 19
Views: 5,357
Posted By JohnDixson

MARS

There used to be a good online close-up video of the USAF doing a catch with their CH-3 but cannot find it anymore. It included the whole sequence wherein after the catch, the drone parachute was...
Forum: Rotorheads
7th Apr 2022, 12:28
Replies: 19
Views: 5,357
Posted By JohnDixson

Shy, you are on point. Not long after I was hired...

Shy, you are on point. Not long after I was hired on at Sikorsky in 1966, the USAF started the Mid Air Retrieval System project to retrieve Firebee Drones with their photos. I recall talking to...
Forum: Rotorheads
27th Jan 2022, 19:21
Replies: 64
Views: 12,351
Posted By JohnDixson

One of our pilots joined with a flight test...

One of our pilots joined with a flight test engineer to buy an S-52, refurbish it, get it painted as it was at first, a USMC machine flown in the Korean War. Before they flew it, he called Mr....
Forum: Rotorheads
10th Nov 2021, 12:20
Replies: 19
Views: 3,153
Posted By JohnDixson

Reminded of Willie Nelson and his Bio-diesel Tour...

Reminded of Willie Nelson and his Bio-diesel Tour Bus: https://money.cnn.com/2007/09/26/news/newsmakers/willie_nelson/
Showing results 1 to 35 of 847
 


 
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