Oh, I see. That must be the symbol for when they still made engines. Typed in the name and saw they are still big into r/c. I finally saw "Thunder Tiger" stamped over the 36 on the other side. I got this years ago on a flimsy contraption I bought on consignment from a long gone hobby shop. It had a length of aluminum channel for a fuselage and some folded over corrugated plastic for wings. I tried flying it and it got away from me and ended up in some power lines way across the field. I went over there the next day and luckily the wind blew it down. I took it off with the servos here it`s been sitting since I think it was 2004 or 5. The engine looks very little used. I`ll put it on that Kobra. There should be another kit out there that I can find for that .18.