Then to finish out my Cox engines .... here is the .09 Medallion, which was a later addition to the line and about double the power output of the little Half A .049 engine. This .09 is set up for R/C as it has an exhaust sleeve that can be rotated in and out of position to partially block the exhaust and thus throttle back the engine.
That does it for the Cox engines in my possession, but they did in fact make a few more, so if interested there is material available online, or shoot me a question here on the thread or via PM and I'll see what I can come up with to answer.