Wm P-51?
Richard L,
Is that World Model Zero? What prop ru running? What is the weight of the Zero? The YS 63 at 11,200 rpm will unload in the air. Wouldn't it approach the 12000 design limit RPM?
Sorry for the barrage of questions but I too am trying to overtake a 61FX (11X7 prop) powered WM Zero.
Thanks
Hisham