The O.S. Max .65 LA actually out-turns the .61 FX on a number of different propellers.

I shot a video of my buddy Fred flying his GP Combat Corsair with a .25 LA on it, and it's no slouch either:

[youtube]http://www.youtube.com/watch?v=MxWBU5BXSPc[/youtube]

The .40 LA was definitely no screamer, and the .46 LA seems to be an average performer, but some of the other LA series 2-strokes can definitely pour on the power.