In most of the country right now, .15 combat is SSC class.

There are a lot of SSC designs out there, most of them very good. Of course, what to build depends mostly on who you are going to fly against. If you are flying club combat, and you want spads, then the Gnat is a really cool .15 size SPAD, and Gnat combat is a huge amount of fun.

However, if you are going to fly SSC against some state of the art SSC planes, the Gnat can't really compete with the current designs out there. There are a lot of options for a competitive SSC plane.