Recently started trying to make a plane mainly for science and contracts. Built one and it keeps veering left and right but its pretty random. When it does go straight it launches just fine I just can't figure out why its not stable. I've tried using a vertical tail fin and not using one but I can't figure anything out. Wheels are in between big wing and tail wings. 2 FL-T400 fuel tanks with the basic jet engine/air intake. Picture below. couldn't figure out how to insert image from url but heres a gyazo picture.
https://gyazo.com/e62b39fb998ad23e134f69d787faf912
Edit: Goes left/right on the runway. Once it takes off its all smooth.
