Hi, I have made myself a spaceplane that gets to about 17,000m then it flips backwards. The thing is, if I turn off the 2 turbojets I have, it doesn't flip, forcing me to use my rocket engine earlier and as a result I run out of fuel. Here's a pic of it. Someone said add more wings to it, but it doesn't seem to help, thats the only reason there are a bunch in the back.