I didn't start to build mine yet, but I plan to use 2 OS FS-40 (old ones).
Take a look at this thread:
http://www.rcuniverse.com/forum/m_76...tm.htm#7697253
Jaka said:
Mine is powered by two OS FS .26 four strokes, swinging 3-blade, 10x5" carbon fiber props.
May be he could provide you more details.
There's not much information about this plane on internet...