........Learning how to shed heat is still a very valid experiment, well worth the cost of a few cheap motors. But you'll get all the heat you need at 3000-4000w for those tests. Maybe keep the watts around 3-4k, but lower amps so you can run 24-30s? I got to 47mph average top speed with 26s myself. The motor would go for awhile, but not all the laps of that particular race. I needed better cooling for sure. I was using the 9x7 winding. I'm sure you can easily see 50 mph with a 10x6.