I have the 300 to. Mine is powered by a saito 80 and will flat spin, blender, knife edge loop all day long WITH ONLY THE LEFT STICK!!!!!! and will even torque roll When I have good day but the right prop helps to. Although i am only 17 I am by no meens an amature although my spelling could use some help. I have had to do some signifigant changes to the model. I redesigned the rudder for NO ROLL OR ANY COUPLING just about doubling the size of the rudder with lots of throw on it. If anybody would like the planes for the rudder I can e-mail them to you. I put an extra inch on the elevaor and hinged it with about 75 degree throw and always make everything lighter!!! The only disadvantage with this model is the weight. And talk about harrier? What harrier although it works more when inverted. I will probably take the saito out and put in an os 91. If anyone has the thrust of this engine I would love to know. I bought this plane to see if I could 3d a 40 and I can.