The Fox baffle motor which is one of my favorites dissapeared simply because the dies wore out. Remember someone said that Fox Motors had sold over 50,000 of them in just the first few years of production. The 15X motor was introduced in 1965 and continued to about 1994 so you know that there were a tremendous amount of them made
The 15 BB version is really in my opinion coupled with the Fox 25BB the 2 best motors in the Fox stable, light and powerful enough to satisfy most of the sport flying crowd.