C. Horner, That carbon prop must have a very low constant (easy to turn vs a thick wooden prop. My numbers indicate 5.5 HP using a constant of 1.21. I used a constant of 1.31 which fits SEP and Xoar props reasonably well. Glow always produces more power than gas. Even DA races their engines on glow! Also the engine is running too fast. In the air it will unload another 1000 rpm in a dive! The constant for APC props is1.11 so I wonder if Mejzlik has an even lower constant. -Tom