I'm going to build a second Comp arf 3.1 330SC. The original with a DA200 is fantastic but want to build another with the same power but the versatility of a twin so I don't need to worry about it quite so much in 3d. 3w gets a bit of bad press but the 110CS on pipes and redline has just been so smooth, linear and powerful, I want more! I'm thinking the 170 on K&S 1090's should be the ticket. The additional weight of the twin ignitions could be helpful as I want to use the same set up as my current plane and put the rudder servos in the tail.