@jiri.kribek
The reason is you are activating the Altitude Hold to far away from the desired or set altitude. I have linked a secondary controller in the description which will help prevent this issue.

Here is the link to it though: Secondary Controller

my plane keep doing loops why?

Thank you for this!!!!!!!!!!!!!!!!!!!!!!

Tigerlal
Yes it would

does this work for subs?

BOBBLMAN
Up/Down is reffering to pitch so for example if you want pitch to be W/S wire W/S to it for input.
Up/Down Output is what you connect to the control surfaces that it will use to pitch the plane!

Up/Down Input and Output

What do i wire Up/Down to? and waht does it do

so i found a solution for the looping. just add a gyro to the mix and i will work just fine

Wilde_Insel
Use the other microcontroller I made today!
It will help with your issue

your CoL it too far forward to the CoM

ok i did everything i need to do but my plane keeps flying loopings! can somebody help or say what i did wrong?

you play this? noice :)

THE best alt hold ever thanks so much

works like a charm

Works nicely. Gonna DIY a failsafe to not activate if altitude isnt close enough which seems to be 400m +/- for my plane.