Hey, glad you like it! The altitude holding system works by keeping the planes climb rate at 0, basically keeping the altitude it was enabled on. If there are any issues I will be glad to adress them if you give me more info ;)

took me a minute to turn on but when i got it to fly its was awesome apart from the alt hold not working for me

Alright, glad it works

nvm it works today.. maybe i was to tired yesterday :P
(engines would turn on and die in like 2 mins)

firugred it out vulpine but i ended up still not able to take off.. ill record a quick video of me running trough your lists

Iam glad you like it! Ive already considered making a larger version but then you are sacrificing its practicality as more engines consume more fuel and that means a smaller range. Ive already had to make quite a few compromises to fit more fuel to make this thing go over 200 km since 4 engines are already quite a lot to keep running efficiently. More engines are fun tho so Its definitely not a bad idea but I think that you would need to make a different chasis from scratch as this one was built from the start with this 4 engine setup in mind. Iam most likely going to make a new aircraft soon but I dont promise that it will be a large one :)

Very good aircraft, would it be possible for you to make a six engined airplane? I believe it would be quite fun to fly a larger airplane, or a modified version of this with an extra set of engines.

Did you turn on the "main systems" breaker in the cockpit? Its located behind the main bottom control pannel.

for some reason it does not allow me to press some buttons in the cockpit like fuel L and R