BTW, IIRC when I was doing 1/2A pylon, my TD with KK needle valve, cyl shims, backplate press, and cut down Cox comp 5X3 was turning somewhere in the 24k rpm range while pulling a ~20 oz airframe and that damn antenna hanging out the rear. A select few had BV Shurikens (gorgeous little engine) that was turning 30k right out of the box!