Why not just one HET EDF 2W-20 (700watts)
I going to try one on a 48" Unicorn I am building...pick it up here on RCG for $55 brand new...warbirds sells them new for just $65! Check out the videos that test three of them including the motor mentioned above.
http://www.warbirds-rc.com/ResearchC...sts/index2.htm
Ken