The Blue Max Eternal is the one Kaz has developed over a very long period and is kitted by Eric at RSM.
It's a great flying Top Class Stunt plane and can be built for Piped or un-piped engines. I wouldn't be surprised if Eric has an electric conversion for it, but not sure about that.
As stated above Kaz is a true Gentleman and top notch stunt flier. He lived here in the US for a number of years (1980's) and began development of the Blue Max series in the 1980's, and continued the development up to date. In my opinion it's as good an airframe as anything around and better than most.
The Eternal is the latest in the series.
Randy Cuberly