We race 1/2 A Pylon with 13 oz - 200 sq in models with .061 glow engines that turn over 30,000 rpms. We use a three pylon course with 300' from end to end and 80' between 2 & 3. a 10 lap race takes a tad over 1 minute to run. The models are going right around 100 mph. We also have an electric class with the same airframes that are even faster.