The engines in use today (if you can find one) are the VA .049's and the Norvel AME .061 that turn the little (4.6 X 2.5) carbon fiber insert props over 30 K with a little work. The 200 sq in wing area models with modern radio gear come in around 11 - 12 oz. The course is a 3 pylon affair with 300" from #1 pylon to #2 and 3 which are 100' apart. We run 10 laps in about 1 min 30 sec. Very addicting indeed. Ya gotta keep yer eye on YOUR model at all times and keep turning left. A well set up racer will fly most of the 10 laps just about on knife edge. AND anything hanging out the back and trailing behind WILL slow ya down!