My son spent the better part of Sunday machining an adapter to adapt an astroflight brush less motor with 19:1 gearbox to one of the right angle drill mechanics. I tested it this evening and its very disappointing. The sensorless brushless motor does not start well under load. Maston had speed problems with their brushless valve drivers, and I suspect it was because the driver uses back emf to sense the position of the rotor and startup must be slow to get synced up.
I ordered a couple of KZCO valves like the Armadillo team uses and the arrived today. With the top case off of the motor and the cable removed it weighs 1528 grams. With a bit of careful trimming I think I could get it to 1300 grams. My ready to go valve assembly weighs about 1100 grams. My valve is faster, lighter cheaper and and more powerful.
I made a video of the valve operating and just uploaded it to you tube.