Are any of those yellow birds in your photo the HZ "Electric Fire"? That's a neat name--they should bring it back. The firebird prop (HBZ1007) being slightly longer most likely has a little more thrust then the Scout prop. I bought a HBZ1007 prop and with TLC shortened it just enough to clear the Scout beam with room to spare. Will try it out tonight and compare difference in climb/thrust and flying time between this altered firebird prop and the Scout prop.

What would you guess is the motor size difference between the yellow firebirds in your photo and the Scout motor? Do both your yellow firebirds and the Scout use the same size motor and battery pack (voltage and amperage)?