clocked speed
We had a measured 600 ft. and I clocked it at 3.3-3.4 seconds several times. I had to get flat and level so verticle was not a factor. That figures out to 140 mph. That was with a master airscrew 10-6 prop. Why that prop? It was fast enough and I don't have time to mess with it anymore and it was reliable. Fun with low maintenance. That prop also made take offs easier!