Cox Star Cruiser Instruction/Manuel/Information

This is a pretty simple issue, I think. I just picked up a like new Cox Star Cruiser flying saucer. Good shape but no box or paperwork. Engine starts and runs fine, but I didn't have a lot of luck launching it. As I was wiping it off after the last attempt before going home from the flying field, I noticed that there were four tabs jutting out from the bottom of the frame with a slot in the middle, like something was supposed to slide or pop into them. Does this thing supposed to have wheels on the bottom, so that torque can make it spin and rotate easily and allow a take off from the ground? I tried search the forum here and the internet and general, and no photos even of the bottom of one of these. I'm going to try hand launching again on my next flying session, and maybe rig up some sort of light weight wheels and axles and see if that helps. Thanks in advance!!
Type at you later,
Dan McEntee