Hey, it's not so bad for a second plane, but here are some tips : First, you NEED 3 landing gears. Otherwise it's going to be hard to take off, and impossible to land. You can put either 2 in the rear or 2 in the front, but it's easier to land with 2 in the rear (you slowly descend and just before touching the ground, you pull up and slow down using the speed brakes). Next, if you put a gear at the rear, it shouldn't be on the last block, otherwise it can't take off until the end of the runway if your plane doesn't pitch up naturally (like the p51 mustang, see how the rear gear is way higher than the front gears ?). You just need to have some gears in front of the COM/COL and behind. Your control surfaces are also way too big and make the plane unstable. You should try to find the optimal size. Good luck and keep making planes to get better at it !