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Search: Posts Made By: JohnDixson
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Forum: Rotorheads
31st Mar 2024, 14:19
Replies: 100
Views: 7,113
Posted By JohnDixson

The rotor coupling response suggests behavior...

The rotor coupling response suggests behavior more like a rate gyro, at least in the machines I’ve been exposed to with reasonably broad maneuver envelopes. The S-67 was an interesting example. It...
Forum: Military Aviation
15th Mar 2024, 14:46
Replies: 73
Views: 14,610
Posted By JohnDixson

T&B-glad you brought up that sling training...

T&B-glad you brought up that sling training anomaly. Example: in 1963 all pilots being trained got sling training in the basic course ( H-19s or H-34s ).
In 1977-8 we trained the trainers at Ft...
Forum: Rotorheads
2nd Mar 2024, 11:25
Replies: 17
Views: 6,560
Posted By JohnDixson

R9chelsea, please pass your Dad best wishes and...

R9chelsea, please pass your Dad best wishes and renewed thanks for his really first class assistance. Those of us in the pilot office at SA will always be in his debt for the help. Don typified the...
Forum: Military Aviation
13th Feb 2024, 17:09
Replies: 33
Views: 12,644
Posted By JohnDixson

Chevvron, I heard a differing version of the...

Chevvron, I heard a differing version of the WS-70 situation, but it ended with the Saudis buying standard UH-60s thru the US State Dept FMS ( Foreign Military Sales ) Program, wherein countries...
Forum: Military Aviation
11th Feb 2024, 16:15
Replies: 30
Views: 7,199
Posted By JohnDixson

Henra, the production machines did not.

Henra, the production machines did not.
Forum: Rotorheads
26th Oct 2023, 19:14
Replies: 186
Views: 38,784
Posted By JohnDixson

Yes, SD and wasn’t that beyond ironic, at least...

Yes, SD and wasn’t that beyond ironic, at least to those of us who vividly recall the oft repeated rule at SA in 1972-3 as we put together the design: “there will be zero exceptions”.*
But to my...
Forum: Rotorheads
13th Oct 2023, 20:52
Replies: 10
Views: 2,106
Posted By JohnDixson

LW and IFMU-your thinking brought back some...

LW and IFMU-your thinking brought back some history.

My first thoughts went back to the rear seat controls in the CH-54 where the cyclic controlled pitch/roll and yaw. But the results of that...
Forum: Rotorheads
3rd Sep 2023, 16:56
Replies: 17
Views: 3,045
Posted By JohnDixson

Sorry Jim-thought I posted an acknowledgement of...

Sorry Jim-thought I posted an acknowledgement of my error, but didn’t push the “Post” button apparently.

The larger machines of course have a real chance to cause trouble in this arena. The CH-53...
Forum: Rotorheads
5th May 2023, 21:30
Replies: 560
Views: 153,227
Posted By JohnDixson

Re Blackhawk 9 and his observation re seats. The...

Re Blackhawk 9 and his observation re seats. The unit I joined had B model UH-1s and the lift platoons had the seats across the rear cabin wall, and at was it.
Remembering that experience, when we...
Forum: Military Aviation
26th Mar 2023, 13:30
Replies: 50
Views: 10,492
Posted By JohnDixson

Hello West Coast. Another C-123 capability...

Hello West Coast. Another C-123 capability discovered quite some time ago in Thailand. Chiang Mai is a joint civil/Thai AF base in North Thailand. Doing a UH-60 marketing tour, we were there to...
Forum: Rotorheads
13th Mar 2023, 16:33
Replies: 560
Views: 153,227
Posted By JohnDixson

212-meant to be able to continue flying, i.e.,...

212-meant to be able to continue flying, i.e., not brought down.
Forum: Rotorheads
17th Feb 2023, 16:39
Replies: 40
Views: 15,064
Posted By JohnDixson

Ft Campbell Blade 8/10/76

https://cimg5.ibsrv.net/gimg/pprune.org-vbulletin/1460x2000/ft_campbell_blade_1976_c3e8a0941d5087ffb2ef53d48c2dddc6ca3badd3.jpg
Sorry for the orientation. Pine trees were 3-4 inches, thus the rotor...
Forum: Military Aviation
15th Jan 2023, 12:45
Replies: 16,445
Views: 18,136,847
Posted By JohnDixson

Not only is NATO not fully committed, SAS, the...

Not only is NATO not fully committed, SAS, the isolationist wing of the Republican Party has yet to grasp the Ukraine implications.
Forum: Rotorheads
14th Dec 2022, 02:26
Replies: 271
Views: 53,870
Posted By JohnDixson

More than ironic if the Bell “Comanche” was...

More than ironic if the Bell “Comanche” was selected!
Forum: Rotorheads
26th Oct 2022, 10:07
Replies: 560
Views: 153,227
Posted By JohnDixson

Sycamore, having watched the US RAH-66 program at...

Sycamore, having watched the US RAH-66 program at close hand, it is easy to sympathize.
Forum: Rotorheads
19th Oct 2022, 14:14
Replies: 35
Views: 7,244
Posted By JohnDixson

Rotor Tip Behavior

Yes to that. Soon after signing in at SA in 1966, one of the senior handling qualities engineers, Dick McCutcheon was talking about this subject and related some findings in a test done on an S-58,...
Forum: Rotorheads
19th Oct 2022, 11:52
Replies: 35
Views: 7,244
Posted By JohnDixson

Getting old and had to ask for a reminder from...

Getting old and had to ask for a reminder from Nick, 212. The main rotor servos on the 76 were placed in a not normal position for other reasons, and the solution to obtain control orthoganality (...
Forum: Rotorheads
18th Oct 2022, 15:28
Replies: 35
Views: 7,244
Posted By JohnDixson

Hah-I haven’t heard that one. A related...

Hah-I haven’t heard that one.
A related anecdote from the UH-60 basic controls design: the lead designer for the UTTAS ( original name for that competition ) was a relatively new, quite intelligent...
Forum: Rotorheads
18th Oct 2022, 14:41
Replies: 35
Views: 7,244
Posted By JohnDixson

The new composite rotor with anhedral tip was...

The new composite rotor with anhedral tip was tested in the 1990’s, and yes the word “ anhedral “ means that an outboard tip was tilted downward a few inches. The hover performance improvement was...
Forum: Rotorheads
8th Oct 2022, 18:12
Replies: 35
Views: 7,244
Posted By JohnDixson

Crab,don’t know whether this was passed along...

Crab,don’t know whether this was passed along thru Westland, but the initial SH3A ( first 61 model ) did not have collective vs longitudinal limiting and the first USN ships had progressed into...
Forum: Rotorheads
8th Oct 2022, 12:04
Replies: 35
Views: 7,244
Posted By JohnDixson

212: can add swashplate bearing failure to your...

212: can add swashplate bearing failure to your list.

Also, worth noting that some manufacturers include, in their control mixing units, aft cyclic limiting as a function of low collective. Adds a...
Forum: Rotorheads
5th Oct 2022, 13:38
Replies: 150
Views: 34,613
Posted By JohnDixson

Thanks, Megan that info is an EEC not a FADEC,...

Thanks, Megan that info is an EEC not a FADEC, and backed up by other posts as well.
Forum: Rotorheads
3rd Oct 2022, 18:58
Replies: 150
Views: 34,613
Posted By JohnDixson

I’m confused. If you go to the Leonardo site and...

I’m confused. If you go to the Leonardo site and look in their 139 brochures, they cite the PT6C-67C engine with FADEC, whereas if one goes to the P&W Canada site and check the same engine, P&W says...
Forum: Rotorheads
3rd Oct 2022, 01:37
Replies: 150
Views: 34,613
Posted By JohnDixson

Megan, I was thinking that if the history...

Megan, I was thinking that if the history recorders were similar to GE;s, collective position, along with a number of other useful parameters would be there. Of course if there were usable FDR and...
Forum: Rotorheads
2nd Oct 2022, 00:41
Replies: 150
Views: 34,613
Posted By JohnDixson

My familiarity with PT6’s ended awhile ago, but...

My familiarity with PT6’s ended awhile ago, but is it a given that their FADECs have built in history recorders?
Forum: Rotorheads
4th Jul 2022, 10:57
Replies: 110
Views: 35,875
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...
Showing results 1 to 26 of 26


 
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