Trimming Problem

[tmansteve]

Not sure why it is doing this. In Flight I try to trim Up or Down and nothing happens. Start again in same mission and then it works. Does Autopilot Engage switch create a problem?

 

I come out of Autopilot when trying to trim.

 

Is this a bug or is there something I should be doing for this to work properly, i.e. Speed etc??

 

Cheers

Edited September 4, 2021 by tmansteve

[itarrow]

Noticed the same recently: with autopilot on, trimming doesn’t work.

 

I have gone back to the F14 few days ago after a long pause, so I thought it was like that forever and I forgot… Now I am no longer sure…

[BreaKKer]

There's a thing when you start a mission that the jet is automatically in autopilot. Just cycle the autopilot engage switch. You can't trim the jet in pitch while in autopilot

 

Edited September 4, 2021 by BreaKKer

[tmansteve]

Thanks for that breakker. There seems to be a few small niggles that need sorting

[JupiterJoe]

When practicing landing at Nellis on a multiplayer server (without using auto-throttle), I lower gear, flaps and the trim gauge automatically climbs about 10 units.  The actual trim doesn't seem to match this though and I have to manually add a great deal of trim in order to prevent the nose from dropping sharply.  The F-14 has an auto-trim system, does it not?  The gauge appears to work but the plane is not trimming itself accordingly.  Do I have this wrong? 

[draconus]

On 2/3/2022 at 5:46 PM, JupiterJoe said:

The F-14 has an auto-trim system, does it not?

Only when AP engaged, otherwise - no.

What do you mean by trim gauge? It's rather "Control surface position indicator" (#9).

http://www.heatblur.se/F-14Manual/cockpit.html#fuel-management-panel

Only DCS controls overlay can show you the trim position.

Edited February 9, 2022 by draconus

[IronMike]

Unless control stick steering is engaged in the AP, trim does not work in the AP, in neither ATT, ALT nor HDG hold.

 

[Hawkeye91]

5 hours ago, IronMike said:

Unless control stick steering is engaged in the AP, trim does not work in the AP, in neither ATT, ALT nor HDG hold.

 

I’ve never heard of control stick steering in the F14, is that just the attitude hold mode when you engage the autopilot?

[sLYFa]

The ITS (integrated trim system) will automatically apply NU trim with flap deployment to counter the flap-induced pitch down moment. It should also apply ND trim with speedbrake deployment, although this is not implemented, since in DCS (unlike IRL), the speedbrake doesnt produce the pitch up moment that would require a trim change. There is also a mach trim feature which increases NU trim ass you go supersonic. All these "autotrim" features are rather primitive though and not remotely comparable to actual autotrim of FBW planes, so you still have to trim manually a lot. 

[IronMike]

23 hours ago, Hawkeye91 said:

I’ve never heard of control stick steering in the F14, is that just the attitude hold mode when you engage the autopilot?

Control stick steering is in effect when in any of the AP modes a certain pressure is applied to the stick. In some cases passing a certain threshold will also disengage the submode, like in ALT hold. Else it allows you to make smooth and precise stick inputs while basically "interrupting" the AP mode. When released again below a certain pressure, the submode either takes over again (ATT hold), or kicks in if brought within a certain threshold like 5° bank in HDG hold, or if the AP ref button is pressed again (ALT hold and GT).