Plane with downwards lift and flying backwards

[MinimalFantazy]

So I am still pretty new to KSP and I have unfortunately encountered some problems, which I can not find an answer to anywhere.

So I have made an air-plane which have worked well. How ever after I made some adjustments to the wings my center of lift started to point downwards. No matter what I do I can not make it turn around. After this happened my plane would turn around and fly backwards when it had no fuel left and was landing (The plane flies backwards not upside down).

Picture of the air-plane design on Imgur --> http://imgur.com/gallery/NUt2cYT and http://imgur.com/gallery/ge4iGid

[sal_vager]

Hi MinimalFantazy, welcome to the forums.

The lift indicator can be confusing at times, as airflow and wings are not modelled in a realistic fashion, they are just "good enough" but that's changing for the 1.0 release.

The cause of your issue is the center of mass (CoM) moving as fuel is consumed, causing it to move behind the center (CoL) of lift, this unbalances the aeroplane and makes it want to fly backwards.

Try right clicking the booster and tweaking out the fuel, see how the CoM changes and move your wings a bit to keep it in front of the CoL.

Don't forget to put the fuel back in

[Yasmy]

And what happens if you flip the orientation of the delta wing?

For now, the wing parts are supposed to be used in their default orientation.

Hopefully this will change in 1.0.

[MinimalFantazy]

So I build the air-plane from scratch again to fix the lift direction and pulled all the wings up horizontal and moved them back a bit and now it flies the right way. Thanks a lot for the help.

[Jimbimbibble]

If wings are backward in the stock game they make no lift, but this will certainly change in 1.0. The aero model is going to be completely redesigned.