I used an Emax 2820/07: http://www.headsuphobby.com/Emax-BL2...otor-F-291.htm
Was major overkill but that's what I had available at the time.. If I did one again, I'd probably go with a 1000KV Turnigy SK3 series.
Made a lot of mods to mine including installing custom designed Chelliegear.: http://www.wattflyer.com/forums/show...ght=Formosa+II
Really liked that plane (past tense) She finally succumbed to my flying skills.
Best of luck o the maiden !