RE: am I over-propping this setup?
Hmm, I wish I had a whattmeter. My VOM doesn't measure amps, either, or I'd test it that way. I picked up a selection of props today at the LHS. Unfortunately, the only one that will fit without an adapter is a 10x4.7. I think it will work though. Motorcalc predicts that this prop will draw 8.2 amps peak (56.1 W) and produce 13.9 oz of thrust. My Dandy weighs about 12 oz., and this combo will let it climb vertically. I tested it tonight in my bedroom... it'll climb right out of your hand if you let it.
I'll probably also use a 9x4.7 prop to get the amps down to about 6.5 and increase the run time. I'll still have 10.7 oz of thrust to play with.
Thanks,
Matt