Can't make the glider start accelerating, therefore cannot make it fly. I fueled it, jumped in pilot seat, pressed Z to start engine, pressed LShift (binded to Crouch) but nothing happens. I kept it pressed or I pressed it several times, hell, I pressed all keys ... nothing, no acceleration. Only the spcebar has a reaction: left foot is moving (probably to brake). Do you have any ideea why it won't accelerate?