Double strokes?

[Sylvan]

This is from the AUTOPILOT NOTES.docx that has been circulating around:

 

(4) Execution of takeoff and flight with the autopilot engaged is easier than with the autopilot disengaged and does not require double strokes of the control stick.

 

What is meant by double strokes?

[jimcarrel]

That whole thing looks screwy to me!

[Devrim]

Ahahahah! This must be a joke!

 

It makes sense to me. Because I'm a drummer. :D

 

 

Edited November 26, 2013 by Devrim

[esb77]

The Mi-8 has sensitive controls and a lot of mass, that can lead to new pilots getting into positive feedback oscillations.

 

Example:

 

You want to fly left.

 

You apply some left cyclic, and hold it. The helicopter has high mass so it is not apparent right away that you have just applied WAY TOO MUCH left cyclic and held it there for WAY TOO LONG.

 

A little time passes.

 

The thrust from the helicopter's control surfaces overcome inertia and the helicopter rolls left far more than you expected.

 

You think OH !#$%^&, TOO MUCH LEFT, TOO MUCH LEFT!

 

You apply right cyclic to keep the helicopter from flipping over to the left and crashing, but due to the high inertia, you have the same problem (too much input for too long) and soon you are correcting your corrections.

 

Leading to control inputs that look like: left, Right, LEFT, RIGHT, LEFT, RIGHT, CRASH!

 

So maybe it looks like you're trying to do drumming the way the joystick is going back and forth.

 

Eventually maybe you manage recovery once you've either learned to time the delay in response or learned not to overcontrol in the first place.

 

The autopilot channels act as dampers and 'subtract' a lot of the pilot's excess control inputs, so it doesn't look like you drank 3 bottles of vodka just before takeoff.

[Yurgon]

Ahahahah! This must be a joke!

 

It makes sense to me. Because I'm a drummer. :D

 

Haha, I know what you mean. :)

 

I followed that up in the Music Thread. :D

[dahui]

The Mi-8 has sensitive controls and a lot of mass, that can lead to new pilots getting into positive feedback oscillations.

 

Example:

 

You want to fly left.

 

You apply some left cyclic, and hold it. The helicopter has high mass so it is not apparent right away that you have just applied WAY TOO MUCH left cyclic and held it there for WAY TOO LONG.

 

A little time passes.

 

The thrust from the helicopter's control surfaces overcome inertia and the helicopter rolls left far more than you expected.

 

You think OH !#$%^&, TOO MUCH LEFT, TOO MUCH LEFT!

 

You apply right cyclic to keep the helicopter from flipping over to the left and crashing, but due to the high inertia, you have the same problem (too much input for too long) and soon you are correcting your corrections.

 

Leading to control inputs that look like: left, Right, LEFT, RIGHT, LEFT, RIGHT, CRASH!

 

So maybe it looks like you're trying to do drumming the way the joystick is going back and forth.

 

Eventually maybe you manage recovery once you've either learned to time the delay in response or learned not to overcontrol in the first place.

 

The autopilot channels act as dampers and 'subtract' a lot of the pilot's excess control inputs, so it doesn't look like you drank 3 bottles of vodka just before takeoff.

 

 

The same Problem have Boeing Pilots, when the Change on the Airbus...

in the The Airbus, you have to forget the normal Turbulences, and just steer that, what you need...

[AlphaOneSix]

This is from the AUTOPILOT NOTES.docx that has been circulating around:

 

Could I get a link to it, please? For some reason it has not circulated near me.