About those Bf 109K-4 "Special" Trim Tab Settings...

[Bowie]

The ones in Options\Special\Bf 109K-4.

After being perplexed with the poor flying qualities of the out-of-trim A/C generally, went looking for guidance on these trim tab setting.

Found this, from a stated multiple reputable documents:

"... 300kmh/kph for a 'free' rudder with straight flight vector was the norm for final flight acceptance trials/test where the A/C was then ready to be released to the Luftwaffe."

So, using that, ran a program.

Empirical: 300kph IAS/0.75 ata/1K alt./Fully fueled.

Came up w/:

Aileron Trim: -25
Rudder Trim:   17

This produces "free", wings level and center ball, under those conditions, and narrow speed and power range.

And flies surprisingly well at combat speeds and power.

And while the A/C did not possess an in-flight roll and yaw trim, the pilot could determine and set that, by control position and physiological feedback, with control deflections returned to that position.

To that, an in-flight position adjustment, as per the P-51D, would accomplish the same function, and solve the problem without the arcade "Auto Rudder" function.

 

Bowie

Edited May 7 by Bowie

[IIIJG52_Otto_]

On 5/7/2025 at 4:43 AM, Bowie said:

Aileron Trim: -25
Rudder Trim:   17

This produces "free", wings level and center ball, under those conditions, and narrow speed and power range.

And flies surprisingly well at combat speeds and power.

And while the A/C did not possess an in-flight roll and yaw trim, the pilot could determine and set that, by control position and physiological feedback, with control deflections returned to that position.

There is very old bug, i´ve explined it here ... The elevator trim-tabs plates are blocked.  why??  i don´t understand.

Even the real K4 had larger elevator trim-tabs than G2/R6 used by E.D. Team as reference for today FM.