[SOLVED] 777 trim broken

[Octal450]

Great guys, I'll give it a nice test.

[KL-666]

Ok, i experimented a bit with the requirements i put down in my previous post, resulting in the following code which meets the requirements now. Not sure if it is done in the right place though.

777-autopilot.xml (Stabilizer Control)

Code: Select all

        <config>
            <Kp>+0.0</Kp>
            <Ki>
                <condition>
                    <property>instrumentation/afds/inputs/AP</property>
                </condition>
                <value>-0.5</value>
            </Ki>
            <Ki>
                <condition>
                    <and>
                        <not><property>instrumentation/afds/inputs/AP</property></not>
                        <greater-than>
                            <property>position/gear-agl-ft</property>
                            <value>50.0</value>
                        </greater-than>
                        <greater-than>
                            <property>orientation/roll-deg</property>
                            <value>-5.0</value>
                        </greater-than>
                        <less-than>
                            <property>orientation/roll-deg</property>
                            <value>5.0</value>
                        </less-than>
                    </and>
                </condition>
                <value>-0.02</value>
            </Ki>
            <u_min>-11.0</u_min>
            <u_max>4.0</u_max>
        </config>


I modified the second condition and changed <Kp>+0.0</Kp>. I do not know if the + is necessary, i did it to indicate delta.

Now a long flare is not messed up by auto trim, and if i roll out of a long turn, i am not mistrimmed insanely up anymore.

Maybe someone wants to consider to build such logic in the 777?

Kind regards, Vincent

[Hyde]

Thank you, Vincent.
I'm on job (real life) now. I will fix after finish.

[Octal450]

@KL-666
@Hyde
Tested, this improves!

[Hyde]

I've pushed the change.
Thanks.

[KL-666]

Hello Hyde,

Tested tonight, and the auto trim seems to be free of adverse side effects now. Will have to fly a bit more, but for now the plane flies very natural overall with the auto trim. Nice job.

Kind regards, Vincent

[Octal450]

Hyde, may I adapt this for the MD-11?

[KL-666]

Hello Hyde,

I saw on the other forum talk about 250 kts below fl 100. It is fine if the autopilot preselects 250 kts at a certain alt during descent. But beware to not enforce it. A pilot must be able to select a higher speed below fl 100 when atc requests it.

Kind regards, Vincent

[Hyde]

Hyde, may I adapt this for the MD-11?

Of cause you can.

[Octal450]

@Hyde
wonderful thanks!