Mi-8 bobs up and down while flying

[Ramstein]

sitting in the cockpit and flying, the cockpit bobs up and down like a fishing bobber on water :doh::huh: ... anyone know why and how to stop it,, impossible to line up on a target or see straight with it bobbing up and down.. thanx

[TickJackson]

I would try relaxing my control inputs, you may be fighting the autopilot and exceeding its control authority, thus causing the oscillations. I'm not sure if this is correct and I don't know how exactly the autopilot works.... Hope I was able to help..

[xaoslaad]

Make sure the pitch roll stabilizer is still active. middle green light, center console.

 

Hard maneuvering causes it to disengage. I like to fly rough so i find myself often dealing with this and having to re-engage it.

 

The other point i would make is hold the cyclic somewhere, if its not what uou want let it settle for a moment while you hold the stick position and ease it where you want it slowly. You can easily get into a mode where you end up constantly over compensating, pushing the nose down, then pulling it ip and so on. Let it settle, compensate slowly.

[vicx]

This could be a lot of things, I get head bobbing in DCS when the axis bindings for my view controls are floating or a bit of dust in an axis pot is making the input dance a little.

 

BUT If you are talking about the Mi-8 itself bouncing.

 

I'm still learning the Mi-8 myself and I use the Control overlay (CRTL-ENTER) and I make sure the Trim is not fighting the AP. Most of the time if there is oscillation I'll turn the AP off and stabilize as much as possible and then turn AP back on.

 

AFAIK the trim should do most of the work leaving the AP to make small adjustments.

 

---

 

I'm not sure how you are meant to use the Mi-8 AP in real life BUT in Belsims module I turn it off when maneuvering. I only turn it on when I am as stabilized as I can get without the AP.

 

With the AP on I can make fine control of stabilized flight pitch and heading using the AP controls but the AP dial controls are fiddly (I hope this can be improved)

 

I have used AP during an attack run but I engaged it way out for Pitch and Heading and slowly adjusted the Pitch-AP target down to 10% to avoid oscillations. I bound an axis on my throttle to the dial for the Pitch-AP (although it seems like needs binding to a rotary encoder).

 

Then as I came in I asked my co-pilot/engineer for the sighting adjustment from the lookup tables. (I paused the sim to look it up).

 

And it's still really easy to miss targets and the rockets have a lot of spread at safe engagement ranges. I just accept that for what it is. My Mi-8 can interrupt enemy movement and that is enough. If my superiors really wanted everything dead they would give me a gunship.

[Rangi]

If my superiors really wanted everything dead they would give me a gunship.

 

LOL:megalol:

[Ramstein]

This could be a lot of things, I get head bobbing in DCS when the axis bindings for my view controls are floating or a bit of dust in an axis pot is making the input dance a little.

 

BUT If you are talking about the Mi-8 itself bouncing.

 

I'm still learning the Mi-8 myself and I use the Control overlay (CRTL-ENTER) and I make sure the Trim is not fighting the AP. Most of the time if there is oscillation I'll turn the AP off and stabilize as much as possible and then turn AP back on.

 

AFAIK the trim should do most of the work leaving the AP to make small adjustments.

 

---

 

I'm not sure how you are meant to use the Mi-8 AP in real life BUT in Belsims module I turn it off when maneuvering. I only turn it on when I am as stabilized as I can get without the AP.

 

With the AP on I can make fine control of stabilized flight pitch and heading using the AP controls but the AP dial controls are fiddly (I hope this can be improved)

 

I have used AP during an attack run but I engaged it way out for Pitch and Heading and slowly adjusted the Pitch-AP target down to 10% to avoid oscillations. I bound an axis on my throttle to the dial for the Pitch-AP (although it seems like needs binding to a rotary encoder).

 

Then as I came in I asked my co-pilot/engineer for the sighting adjustment from the lookup tables. (I paused the sim to look it up).

 

And it's still really easy to miss targets and the rockets have a lot of spread at safe engagement ranges. I just accept that for what it is. My Mi-8 can interrupt enemy movement and that is enough. If my superiors really wanted everything dead they would give me a gunship.

 

 

THE ap AND STaBILIZER STUFF.. I HAVE TO STUDY UP ON THIS STUFF... I bet this is the culprit

..

Thanx ! :doh:

[Cibit]

This could be a lot of things, I get head bobbing in DCS when the axis bindings for my view controls are floating or a bit of dust in an axis pot is making the input dance a little.

 

BUT If you are talking about the Mi-8 itself bouncing.

 

I'm still learning the Mi-8 myself and I use the Control overlay (CRTL-ENTER) and I make sure the Trim is not fighting the AP. Most of the time if there is oscillation I'll turn the AP off and stabilize as much as possible and then turn AP back on.

 

AFAIK the trim should do most of the work leaving the AP to make small adjustments.

 

---

 

I'm not sure how you are meant to use the Mi-8 AP in real life BUT in Belsims module I turn it off when maneuvering. I only turn it on when I am as stabilized as I can get without the AP.

 

With the AP on I can make fine control of stabilized flight pitch and heading using the AP controls but the AP dial controls are fiddly (I hope this can be improved)

 

 

 

I have used AP during an attack run but I engaged it way out for Pitch and Heading and slowly adjusted the Pitch-AP target down to 10% to avoid oscillations. I bound an axis on my throttle to the dial for the Pitch-AP (although it seems like needs binding to a rotary encoder).

 

Then as I came in I asked my co-pilot/engineer for the sighting adjustment from the lookup tables. (I paused the sim to look it up).

 

And it's still really easy to miss targets and the rockets have a lot of spread at safe engagement ranges. I just accept that for what it is. My Mi-8 can interrupt enemy movement and that is enough. If my superiors really wanted everything dead they would give me a gunship.

 

:) Pretty much my thinking on this subject

[Art-J]

sitting in the cockpit and flying, the cockpit bobs up and down like a fishing bobber on water :doh::huh: ... anyone know why and how to stop it,, impossible to line up on a target or see straight with it bobbing up and down.. thanx

 

Are You sure You're not overspeeding it? Once You hit ~220, retreating blade stall starts kicking in and the chopper WILL shake and handle badly, wih AP or not.

[Nasum]

Make sure the pitch roll stabilizer is still active. middle green light, center console.

 

Hard maneuvering causes it to disengage. I like to fly rough so i find myself often dealing with this and having to re-engage it.

 

The other point i would make is hold the cyclic somewhere, if its not what uou want let it settle for a moment while you hold the stick position and ease it where you want it slowly. You can easily get into a mode where you end up constantly over compensating, pushing the nose down, then pulling it ip and so on. Let it settle, compensate slowly.

 

Ahh, i wondering why the AP is turning of when i get more boost...is this normal? For a while i cant flight and now it was noticeable. Flying hard is not possible??

[GunfighterSIX]

The AP has never kicked off for me for hard maneuvering, it has however kicked of because of poor power management. If you pull to much collective, droop the rotor, then you will kick off the generators and lose the AP. People make the mistake of yanking on the collective to much while combat maneuvering, and this will kill your AP. VNE for this aircraft is 135 KIAS or 250 KPH, you should not be seeing retreating blade stall until well after that (around 300 for me), but remember dissymmetry of lift is always happening once the aircraft starts moving and you will fell that more at the 250 range than the 100 kph range. People often confuse the difference between dissymmetry of lift & retreating blade stall.

[Holbeach]

This is what works for me.

 

Correct trim at all times is essential on an inherently unstable machine.

 

Avoid any unwanted input on the stick from other switch movements.

 

I put the trim switch on the trigger button and the gun button on a throttle button, thus avoiding any input to the stick when firing.

 

Correct trim at all times will avoid you trying to push the nose down while trying to line up a shot, which will start off the bobbing motion.

 

 

 

Even more important to keep it trimmed wnen using the, more precise, 23mm cannon.

 

 

 

 

.

Edited April 9, 2015 by Holbeach

[ebabil]

i read "boobs up and down while fliying" and of course shocked lol

[Art-J]

Rotor RPM going down to 80-something percent -> generators switch off, so does the AP. Not much room for error.

[Holbeach]

Even more important to keep it trimmed when using the, more precise requirement of the 23mm cannon.

 

 

 

 

 

.

Edited April 9, 2015 by Holbeach

[Ramstein]

the Ctrl+Enter seems to work... (btw, when saying ctrl, or shift, etc, please state right, left, or both.. thanx). Also, how to you enable pitch, stabilizer, control etc.. guess I have to read all that again..

[Socket7]

Rotor RPM going down to 80-something percent -> generators switch off, so does the AP. Not much room for error.

 

I really do need to make a video on rotor droop.

 

Minimum allowable rotor RPM is 88%. Generators cut out at %85

 

If rotor RPM drops below 92%, reduce collective to keep rotor RPM within 95%+- 2%

 

Maximum rotor RPM is 103%

 

 

To enable the autopilots, press the green buttons on the center console. The center one is pitch/roll, the left is yaw, and the right is collective. Pitch and roll should be on all the time, yaw and collective are used when you're going in a straight line for a long time. (Trying to use yaw autopilot at inappropriate times can lead to the foot pedals becoming poorly trimmed. If you suddenly find you're losing tail rotor authority, look at your foot pedals and see if they're wildly out of trim, and reset it if necessary.)

 

If you have red lights on the center console, look up at the triangular control panels on the roof and make sure the switches on the bottom rows of both are flipped up. The autopilot relies on the attitude indicator switches on those panels.

Edited April 9, 2015 by Socket7

[Belgeode]

I am an odd person. When I fly the Mi-8 I keep the roll/ pitch OFF, actually. No bobs, no problem.

 

Of course I know that is now how you SHOULD fly it, but it feels much more natural TO ME, so I just leave the suckers off and hand fly the helo. So far, no crashy, so I must be doing something right.

 

I use the trim when needed (straight line flight), but otherwise, just me and the stick.

[1.JaVA_Platypus]

I use about 20 to 25% of curvature on my picth and roll axis. It smooths out the bobbing quite a bit.