This version of the HMS Ruler can be modified for use with the CFS2 GreenGhost Catapult system.  The only difference between this version and the catapult version is the Takeoff Start point.  In this version the aircraft is positioned for launch from the rear deck, as opposed to the port catapult.

If you wish to use the catapult version, simply replace the ship.CFG file with the one in the Catapult CFG file folder.