Patternman,

I am powering mine with a 3W 75iUS, should provide plenty of power. However, it is a 5 1/2 pound engine with muffler and ignition. I will say that my 73" wing span Goldberg Ultimate will go out of sight verticle with the 3w 75iUS. And it weighs north of 20 pounds. I considered a ZDZ 60 (as I have a ZDZ 80 and it runs well), but had the 3W. Not quite finished, but I suspect I will put the batteries behind the wing tube to balance and right now I have one rudder servo in the tail.

Blue Skies & Fair Winds,

Rege