Originally Posted by
Hours
I actually tried to make a "SPACEplane", but ended up at 4k M.
It was too heavy and when the back-part with the regular fuel came loose, it just started to spin, even with SAS.
I've almost got mine on orbit around kerbin, but the fuel is just not enough.
also, try to place the center of the mass in the middle, and the lift force as well, and to make it more controllable, put some canards, or controllable wings, or maybe even rcs.
and also I somehow figured out a bug when something (for e.g an attached decoupler) goes inside an another part, or you place multiple parts together, and they go into eachother, the plane,or rocket eventually starts spinning for no reason.