Take off with heading a/p on

[ebabil]

I can land very easily when heading ap is on, and after i land, i try to take off with same setting but helicopter tries to turn insanely, shouldn't i use heading ap while taking off?

[Sealpup]

I don't thing the heading AP channel works with weight on wheels.

[Art-J]

The manual specifically states only roll & pitch channels should be used during rolling takeoff, though I don't remember the reason for that. Yaw channel is optional for vertical takeoffs. I also suspect that trimming and virtual flight engineer might be involved in your problem as well, but it's impossible to say how they're set up without a watching a track and your special options settings.

Edited August 2, 2017 by Art-J

[AlphaOneSix]

The heading channel works with weight on wheels. The only time it doesn't work is when your feet are on the microswitches, simulated here by movement of the pedals. There is nothing wrong with having the heading channel engaged during takeoff, however, after landing, it may be good practice to turn it off and then back on to "reset" it. Depending on how you're landing, you may have a much different pedal setting than when you take off.

[Weta43]

The heading channel should work fine at takeoff

 

This was for something else, but is the heading channel controlling the aircraft without any rudder input at all through a takeoff and landing.

 

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[ebabil]

when i use heading ap, i don't use pedals, becasue if i use pedal input, heading ap disengages automatically. as soon as i take off, helicopter starts to spin.

i will add a track file when i get home.

[Looney]

The heading channel is not an autopilot, just a damper. It'll try, within its authority, try to keep the nose into the direction it was activated in.

 

Although very useful in flight, the Mi-8 has, as any other helicopter, a natural tendency to need quite some pedal input on take-off to compensate for the additional torque induced by high collective setting to get airborne. Once through Effective Translational Lift, required pedal input is severely les required and that's the point the heading channel will keep the nose pointing in the right direction.

 

What is most likely happening is that the heading channel is at the limits of its authority AND setting the pedal input to compensate (shown by the yellow icon in the AP channel heading window) but is too slow to compensate the torque.

 

Bottom line, learn to take off using pedal input instead of relying on the AP channel.

[ebabil]

in fact i don't like using a/p with mi-8. i only use alt hold ap during long flights and i don't touch heading hold, roll and pithc channels either. i generally use pedals and stick/collective and nothing else

yesterday i need to make sling loading and i prefered to use hdg hold, it worked like a charm and then i landed for a few seconds, then i applied some collective to hover and helicopter started to spin. i tried to recover by using pedals to reverse direction to comphensate spinning, but within a few seconds i crashed.

[Weta43]

Perhaps you missed the post saying that as soon as you move the pedals the heading channel turns off ?

 

Also, the suggestion wasn't that you should take off relying on the ap heading channel, only that if you're gentle with the collective it will manage your heading - so it works fine at takeoff, but if you're brutal with the collective you'll exceed it's authority - but you'll also be making your own control more difficult. Be gentler, and it will be easier.

 

You may not like using the ap channels, but like the Ka-50, they're there to be used.

[lmp]

While I understand why it was done this way, the fact that having your z axis centred is treated as if you took your feet of the pedals means you're going to struggle with the "yaw channel always on" approach. In the real thing when the pilot puts his feet on the pedals he can count on the yaw channel not interfering with what he's doing. In DCS you'll have it turning on and off all the time. Because of that I tend to fly with the pitch and roll channel on and I only turn on the yaw channel when I specifically want the feet-on-the-floor heading hold functionality. This approach is also described in the manual as the preferred way in the Russian Federation.

[AlphaOneSix]

Imp, what you're describing is indeed the best way to do it, in my opinion.

 

The roll and pitch channels sort of do both stabilization and autopilot. That is, when you are not moving the controls, they are trying to hold your current roll and pitch attitudes. However, they are perfectly fine with control movement and will always try to hold the new roll and pitch attitude as soon as the cyclic is no longer being moved. While the cyclic is being moved, the roll and pitch channels are still very active, and at that point are just doing stabilization work (which they are really doing all the time, they just aren't trying to hold that previous attitude anymore).

 

The heading and altitude channels are a bit different. They both do hold only and do not do any damping or stabilization. To move the collective, you need to push in the collective brake release (trim) button and that will turn off your altitude channel until you reengage it manually. The heading channel is similar, except it uses the microswitches in the pedals to temporarily turn the heading channel off and on. This is a bit difficult to simulate in the game. The best strategy, in my opinion, is the one mentioned above by Imp. Just my opinion, of course, and everyone is welcome to fly it how they want.

 

It is important to note that on this version of the Mi-8 (in real life and in game), the heading autopilot has 100% authority! it is not limited to 20% like the other channels. Once the heading autopilot hits 20% input, it will actually start to move the pedals in order to maintain the set heading.

[Looney]

Imp, what you're describing is indeed the best way to do it, in my opinion.

...

 

It is important to note that on this version of the Mi-8 (in real life and in game), the heading autopilot has 100% authority! it is not limited to 20% like the other channels. Once the heading autopilot hits 20% input, it will actually start to move the pedals in order to maintain the set heading.

 

And this is a point that you need to take note of because you'll get caught with your pants down on landing or take-off when your real pedals are centered and your virtual ones are somewhere else.

 

Perhaps it is an idea to reset trim first before taking off again after landing?

[msalama]

Perhaps it is an idea to reset trim first before taking off again after landing?

 

Yup. Need to do this I've found. Always reset the trim after putting the wheel brakes on.

[BitMaster]

With some training you can safely lift off and settle again perpendicular with manual rudder only.

Thats how i do it.

 

 

 

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