I wonder what this motor on this airframe would be like.

http://www.valuehobby.com/airplanes/...k-540-arf.html

Seems with a 13x6 I could get in to the 8lb thrust range which would be borderline 3D territory.  Not sure this model has the control throws needed to be a contender.

I crammed a OS GT22 into a H-9 Katana 50 which ended up weighing 7.5 lbs AUW so you would be in the mid 6s for that model.