RE: Best 50cc plane for 3D?
I talked to Mark at Aeroworks. He said that of the 50cc Extra 260, Extra 300LP and Yak, the 260 is the most stable in 3D and the Yak is more oriented towards precision flight and has a slightly higher roll rate than the extras.
The Extra 300LP is about a quarter to half pound lighter than the 260 and has a lower wing; it has more wing rock in the harrier than the 260 does and is geared towards more experienced 3D or IMAC flyers.
Of their planes, he recommended the Extra 260 for what I am looking for (mostly 3D with IMAC capabilities as well).
David