I have the CMP spitfire and zero. The spit is quite a bit smaller in fuselage, less glass and so is much lighter. But both planes have short nose so I expect to have better luck balancing with spit than with zero. I'm waiting for the motors to come in. Plan to use Saito 180 for zero and YS110FZ for the spit. I expect that my zero will come out couple pounds heavier than spitfire even though both have 71" spans.[:-]