I'm pretty sure that the pilot said that it was a 1-cyl engine (though I could have heard him wrong). I was under the same impression as you - at least 2 cylinders.

We were also commenting on how his prop (3-blade) wasn't a whole lot bigger than the ones used by some of the 1/4 and 1/3 scale guys at the club...

Maybe we could have put a Saito 2.20 on this thing and flown it!

Bob