Cox Dragonfly .049 information wanted

I recently purchased a Cox Dragonfly .049 engine and am interested in it's history. Why was it made, where was it used? How hard is it to start? etc. I am currently looking at Admin's Cox Engine page/website and reading up on it. Was it made primarily as a RC engine with a large tank? thanks in advance for any responses.

edited 10-27-12 10:11p.m. PST - p.s. when was the prop driver plate changed from a round no drag to a hex driver plate??

edited 10-27-12 10:40p.m. PST - p.s. for some reason it took several minutes to get to the link. once there it downloaded quickly.
happydad