I'm a keen fan and flyer of the SW2.It really flies a treat.My winter project is a SIG 1/4 scale.On the power front,I use an Irvine46 2 stroke,which has oodles of power and thrust for this model.Having read the various threads,I can't but help wonder whether there is another SW2 kit is out there with lead mounted firewall demanding a huge engine size.I get a fifteen engine run on the supplied tank with spare juice on landing.The Irvine runs like silk.