Well it's better than the Australian 6-stroke or the micro-cam engine. If it was tried in 1913 and dropped, what's going to make it work now? New materials? If he's having to run pre-mix it's a non starter on emissions. If there is nothing really new, it strikes me as a curiosity rather than a practical design, 50 HP from what's really a supercharged 500 doesn't seem that fantastic. Good luck to the guy though he's certainly got the skill to make it work if there is anything there.
I'm getting a Hybrid on Monday. New Company hack is a Petrol-Electric Honda. The Hybrid monica I can tell is going to get over used in the near future.
Andy