extras have a tapered leading edge as far as the numbers they mean the modle for the airplane but a 260 the wing and the horizonal are in a straight line were a 300 and a 330 the horizonal is higher than tha wing in real life i think there are only 2 260's and i think only a few 330 bit alot of 300 the edge 540 i don't know much about except the leading edge of the wing is a straight line making the plane not want to stall very eazy that makes it a great 3d plane but not good for imac
a cap is a low wing plane same wing as an extra but tends to be snappy unless the cg is perfect and there set up right also another great 3d plane
and in my oppion yaks and sukois suck i just don't like the way they look