@SimpleTechAndResearch i know i said that lol

@CleverchesyTM Latent is a Moderator

@TheLatentImage omfg thank you so much <3 now i can FINALLY build planes :D thnx mod (only one i ever seen active when i am online XDD) <3

@CleverchesyTM
CoL = Center of Lift
CoM = Center of Mass
Try to keep your CoM in front of your CoL. But too far in front of CoL and your plane will nose down towards the ground. Too close to CoL and your plane will nose up towards the sky.

@TheLatentImage @CaesiciusPlanes @BeryllCorp Thank you for your help... but i am dutch soo I understand and all its just a little hard for me to understand the whole CoL things and all i never seem to make a good plane :/ thanks for your help though :D <3

@CaesiciusPlanes forgive me for saying this but What kind of explanation is that? Haha! My head hurts after reading it.
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@CleverchesyTM you should also consider your wings airfoil. A Flat Bottom airfoil creates the strongest lift in your wings, semi-symmetric has okay lift and symmetrical produces almost no lift at all. If your plane is drifting upwards without input from you, you can change the airfoil in the front wings to semi-symmetric or symmetrical. Conversely, you can change the airfoil on the back wings so they produce more lift to counter the natural upward motion of your plane.
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lots of things to consider. Suddenly, building a perfectly leveled plane is not so simple.

It has to do with wing placement and weight distribution. Where your center of lift is in comparison to your center of mass will effect how the plane flies. You can adjust these two in order find a happy medium or you can use your trim slider (on the right) to adjust the trim to allow for level flight.