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Search: Posts Made By: JohnDixson
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Forum: Rotorheads
26th Oct 2022, 11:07
Replies: 272
Views: 66,660
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, 15:14
Replies: 35
Views: 5,280
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, 12:52
Replies: 35
Views: 5,280
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, 16:28
Replies: 35
Views: 5,280
Posted By JohnDixson

Hah-I havenít heard that one. A related...

Hah-I havenít 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, 15:41
Replies: 35
Views: 5,280
Posted By JohnDixson

The new composite rotor with anhedral tip was...

The new composite rotor with anhedral tip was tested in the 1990ís, and yes the word ď anhedral ď means that an outboard tip was tilted downward a few inches. The hover performance improvement was...
Forum: Rotorheads
8th Oct 2022, 19:12
Replies: 35
Views: 5,280
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, 13:04
Replies: 35
Views: 5,280
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, 14:38
Replies: 150
Views: 24,895
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, 19:58
Replies: 150
Views: 24,895
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, 02:37
Replies: 150
Views: 24,895
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, 01:41
Replies: 150
Views: 24,895
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?
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