Nope, there's no hinge in mine, it's pushed out by radial decouplers and Sepatrons, and because the decouplers push it out a little too far, the Sepatrons push it back in. Opening sucess rate on launchpad is close to 100%
About time I released this, been in the workshop since 1.0 came out. It can jump even on Kerbin gravity, but very hard to control. Download if someone wants it.