RE: Clark 1/4 Spitfire
Yes, that is my Spitfire on that Youtube link. I found the engine/prop combination to be less than satisfactory. The 26x8 3 blade just didn;t have the umph to really haul it around. It is true it is more scale in appearnace, but I would prefer aX 2 blade for flying, or at least a 24x10 3 blade to get the RPM up. i never got over 5800 RPM on the groun, but with so little pitch, the plane would not get out of it's own way. The video does show the stability of a great model, however.
Jeff