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Forum: Rotorheads

7th Aug 2022, 10:03

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

Thanks GM, I have heard that the Helionix is very...

Thanks GM, I have heard that the Helionix is very good so some pilots must have been involved in its development :)

Forum: Rotorheads

6th Aug 2022, 14:41

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

It seems to me like manufacturers love to load...

It seems to me like manufacturers love to load their AFCS with so many extras, maybe to try and out-spec the competition that they forget that a good AFCS does all the basics well through a simple,...

Forum: Rotorheads

5th Aug 2022, 14:16

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

It may not be strictly on topic but is a valuable...

It may not be strictly on topic but is a valuable topic of conversation.

A common theme seems to be that not enough pilots seem to know their autopilots as well as they should - if you're not sure...

Forum: Rotorheads

4th Aug 2022, 15:11

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

It is no more than a mild irritation though and...

It is no more than a mild irritation though and becomes almost imperceptible when you become accustomed to it.

Personally, I never fly stick trim off, even ASE out as I much prefer a 'datum'...

Forum: Rotorheads

2nd Aug 2022, 10:07

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

Yes a lot of 'autopilots' do that - the 412, the...

Yes a lot of 'autopilots' do that - the 412, the Sea King and the Dauphin for starters. :ok: always entertaining when a student forgets...

Forum: Rotorheads

2nd Aug 2022, 07:19

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

ah yes, familiar with that terminology from the...

ah yes, familiar with that terminology from the 139.

i think 'spirited' angles of bank would have to be in excess of 30 degrees and much more than you would use IFR but I take your point. The Sea...

Forum: Rotorheads

1st Aug 2022, 17:26

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

In ATT mode, you can roll into a turn against...

In ATT mode, you can roll into a turn against spring pressure and then release and it will roll you out again - you can beeper trim it into the turn and it will stay there. I don't understand what...

Forum: Rotorheads

1st Aug 2022, 08:06

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

I would definitely recommend SAS rather than ATT...

I would definitely recommend SAS rather than ATT for deck landings especially in difficult conditions. You can trim the aircraft to a decent hover before you move in but you want crisp control...

Forum: Rotorheads

31st Jul 2022, 18:04

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

SAS = fast acting linear actuators with limited...

SAS = fast acting linear actuators with limited authority for rate damping.

ATT = slower acting parallel actuators with 100% authority than can re-centre themselves in an 'open-loop' condition...

Forum: Rotorheads

27th Jul 2022, 08:11

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

Not so much an opposite force in pitch/roll but a...

Not so much an opposite force in pitch/roll but a rate damping effect between pilot control input and the AFCS output to the rotor to improve handling qualities.

Having said that, the gyros don't...

Forum: Rotorheads

26th Jul 2022, 14:37

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

So those three switches at the bottom of the...

So those three switches at the bottom of the console marked Pitch Roll and Yaw were for show too then............

Forum: Rotorheads

26th Jul 2022, 08:19

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

I taught on both the HT3 (RAF Gazelle) and the AH...

I taught on both the HT3 (RAF Gazelle) and the AH 1 (Army Gazelle) - SAS and stick trim were good to have but not essential it is just a great aircraft to fly.

Forum: Rotorheads

25th Jul 2022, 21:32

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

In the Sea King, you needed differential pedal to...

In the Sea King, you needed differential pedal to disengage the heading hold with the ASE in - since not many pilots sat on the deck with differential pedal pressure any heading change of the ship...

Forum: Rotorheads

26th Oct 2009, 12:35

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

212man - I clearly didn't remember correctly:ok:...

212man - I clearly didn't remember correctly:ok: Now I think about it the Gazelle SAS used rate gyros as you describe and the Sea King AFCS uses differentiated attitude info to give rate damping. Doh!

Forum: Rotorheads

26th Oct 2009, 07:02

Replies: 86

SAS and ATT mode

Views: 29,327

Posted By [email protected]

IIRC a simple SAS takes the displacement...

IIRC a simple SAS takes the displacement information from the gyro, integrates it giving you displacement over time = rate and then opposes that rate using a feedback loop to modify the output. The...

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