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Search: Posts Made By: JohnDixson
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Forum: Rotorheads
26th Jul 2021, 12:42
Replies: 26
Views: 5,932
Posted By JohnDixson

Fuel Burn

This discussion reminded of a related situation in the late 60’s at Sikorsky. We had started a Commercial Skycrane Marketing effort and on-site demonstrations were a key part. Now the S-64, no matter...
Forum: Rotorheads
14th Jul 2021, 12:50
Replies: 13
Views: 3,035
Posted By JohnDixson

SAS, your information is all I have seen re the...

SAS, your information is all I have seen re the video clip. It certainly looks like the classic 2/3P mechanical instability as it starts. Easy to criticize when ignorant of the details as to what...
Forum: Rotorheads
1st Jul 2021, 21:04
Replies: 13
Views: 1,800
Posted By JohnDixson

Hello Megan: that is a formation light and it is...

Hello Megan: that is a formation light and it is as noted above, pretty far aft on the tunnel cover.
Forum: Rotorheads
23rd Jun 2021, 22:52
Replies: 96
Views: 10,873
Posted By JohnDixson

SAS, what is with the guy in the right seat...

SAS, what is with the guy in the right seat wearing shorts and white sox?? Great shot anyway
Forum: Rotorheads
23rd Jun 2021, 12:05
Replies: 96
Views: 10,873
Posted By JohnDixson

Someone out there must have a picture of an Army...

Someone out there must have a picture of an Army CH-21C doing a running takeoff on the nosewheel?
Forum: Rotorheads
9th Jun 2021, 01:37
Replies: 52
Views: 4,246
Posted By JohnDixson

GB, I wasn’t suggesting a dual simultaneous...

GB, I wasn’t suggesting a dual simultaneous failure. I was merely explaining that once dual fadecs are on a given machine, the redundancy of sensors and processing eliminates all of the failure modes...
Forum: Rotorheads
7th Jun 2021, 15:27
Replies: 52
Views: 4,246
Posted By JohnDixson

High side failures in a twin engined machine have...

High side failures in a twin engined machine have always been a challenge as described. Hopefully, the new dual Fadec designs will eliminate all but the fuel valve failing open. Perhaps someone from...
Forum: Rotorheads
3rd Jun 2021, 20:25
Replies: 23
Views: 7,236
Posted By JohnDixson

I cannot find a small number of pics from that...

I cannot find a small number of pics from that landing site at Ft Campbell, so the only picture I have at the moment of the downed ship, is the same one that is in the SA Archives link that you...
Forum: Rotorheads
3rd Jun 2021, 14:49
Replies: 23
Views: 7,236
Posted By JohnDixson

A friend sent a picture of the snorkel setup-it...

A friend sent a picture of the snorkel setup-it mounts thru the left cabin opening. Looked substantial. The video provoked some thoughts about qualifying a new design. One obvious first subject to...
Forum: Rotorheads
30th May 2021, 12:16
Replies: 339
Views: 42,082
Posted By JohnDixson

JimEli, see:...

JimEli, see: https://apps.dtic.mil/sti/citations/ADA183954. I’m curious about the “ other oddities” you mentioned.
Forum: Rotorheads
30th May 2021, 01:10
Replies: 339
Views: 42,082
Posted By JohnDixson

Nick says that in the B, there is no PBA as in...

Nick says that in the B, there is no PBA as in the A originally, but the PBA function was buried n the AFCS.
Forum: Rotorheads
29th May 2021, 19:25
Replies: 339
Views: 42,082
Posted By JohnDixson

SAS, you’ll recall that I got a CH-47 checkout...

SAS, you’ll recall that I got a CH-47 checkout from two Boeing test pilots immediately after graduating from flight school, and recall the Differential Collective Pitch system clearly ( because I...
Forum: Rotorheads
29th May 2021, 16:33
Replies: 339
Views: 42,082
Posted By JohnDixson

SAS, for some reason I did not receive your...

SAS, for some reason I did not receive your email, but have looked in here anyway. Disclaimer is that after the 76A development/FAA certification and some B model maneuverability envelope testing, I...
Forum: Rotorheads
27th May 2021, 16:50
Replies: 323
Views: 106,239
Posted By JohnDixson

CV-22 Crew

Anyone notice that on the Osprey thread, the latest post #642 refers to the last CV-22 being delivered at Cannon AFB to its "two assigned crewchiefs".Typo??
Forum: Rotorheads
27th May 2021, 12:37
Replies: 339
Views: 42,082
Posted By JohnDixson

Aside to the response above by SAS: Also, the ATC...

Aside to the response above by SAS: Also, the ATC radar canít be expected to offer the performance of an onboard TF/TA radar.
(Terrain Following/Terrain Avoidance).
Forum: Rotorheads
24th May 2021, 16:43
Replies: 49
Views: 16,509
Posted By JohnDixson

Media reported:"after undergoing maintenance", in...

Media reported:"after undergoing maintenance", in an earlier post. One would think that the ground run part would include trying small control movements and looking for the correct rotor response (...
Forum: Rotorheads
24th Apr 2021, 19:47
Replies: 89
Views: 21,664
Posted By JohnDixson

Hello Bayek. If I recall, the Army requirement...

Hello Bayek. If I recall, the Army requirement for the UTTAS said that the entire vehicle had to be invulnerable to 7.65mm, while a lesser part of the vehicle to 12.7mm ( 51 cal ) and the blades and...
Forum: Rotorheads
23rd Apr 2021, 16:54
Replies: 89
Views: 21,664
Posted By JohnDixson

Question re the mission: will this be an aircraft...

Question re the mission: will this be an aircraft doing an admin mission or will it be expected to go in harm's way? If the latter, will there be related spec requirements for ballistic survivability...
Forum: Rotorheads
22nd Apr 2021, 10:18
Replies: 21
Views: 3,803
Posted By JohnDixson

Curious, MM: does that chart date from back when...

Curious, MM: does that chart date from back when Boeing licensed the MBB-105 rotor technology for their UTTAS prototypes ( YUH-61 )? Notation refers to Boeing.
Forum: Rotorheads
17th Apr 2021, 01:46
Replies: 54
Views: 10,512
Posted By JohnDixson

Correct, 212. I just re-read the Sultan post and...

Correct, 212. I just re-read the Sultan post and the language re the 97 almost sounds legalese. Curious.
Forum: Rotorheads
16th Apr 2021, 11:53
Replies: 54
Views: 10,512
Posted By JohnDixson

Re the Post #46 mis-information: The XH-59 was...

Re the Post #46 mis-information: The XH-59 was flown up to Ft. Rucker from the DFC in Florida and Messrs Lappos and Dixson got to fly it from Rucker back to West Palm with Dave Wright showing us how...
Forum: Rotorheads
16th Apr 2021, 11:18
Replies: 15
Views: 3,034
Posted By JohnDixson

Folks who did back seat flying in the CH-54 where...

Folks who did back seat flying in the CH-54 where the electric sidearm controller did pitch/roll and yaw would certainly concur with Ascend Charlie and IFMU. Still, the RAH-66 had those three on the...
Forum: Rotorheads
6th Apr 2021, 17:58
Replies: 19
Views: 3,581
Posted By JohnDixson

I'd imagine the Bell 525 and some version of the...

I'd imagine the Bell 525 and some version of the S-70 might be proposed. Some of the NYC hierarchy might remember the response they received from Sikorsky on 9/11. when no one else seemed interested.
Forum: Rotorheads
5th Apr 2021, 16:09
Replies: 71
Views: 12,763
Posted By JohnDixson

Sorry, Crab seems I misread the report wording....

Sorry, Crab seems I misread the report wording. When I read “ broken “ I just assumed the huge centrifugal force would carry the outboard segment away.
Forum: Rotorheads
4th Apr 2021, 17:52
Replies: 71
Views: 12,763
Posted By JohnDixson

Crab-good point re drag. With the departure of a...

Crab-good point re drag. With the departure of a healthy segment of blade, the Nr would upspeed. Does the Roninson have any sort of overspeed protection? or, is it possible the pilot saw the upspeed,...
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