RE: Spektrum A5030 / A5040 for Q500?
I have used Spektrum 5030s in the V-tail of my AMA 428 NEME -Q on a 6 Volt 800mAh battery for about 4 months now with great results.
I recommend 5030s for tails and 5040s for ailerons (5040s have metal gears 5030s have nylon gears).