Both Jason and Tony are using the C50-14XL, 6.7:1, 22x12, 10s3p Lipo setups. I own a much lighter 2M plane called "E-factor" design by a German FAI flyer. My plane runs a C50-13XL, 5.2:1, 19x8, 10s3p. I don't have as much ground clearance as they have so I've geared differently. My plane also only weighs 9lbs all up so I can tolerate the inefficiencies of the smaller prop. These are all 2400 watt systems.

The only caveat about the outrunner is that because it is less efficient, it will tend to get hotter at high power - eg: 5% less efficiency on a 2M plane = 120 watts of heat. Again, it's all a matter of how much performance you're looking for.

-- Kyle