Hey Dave,

I can't help but trying and comparing the APC 11x7 (they don't make a 7.5) and the MAS 11x7.5 versus the 11x7.5 Zinger.

I'll let everyone know the results as far as RPM's on the ground as soon as I can get a hold of the props.

I might need the ounce or so's extra weight of the APC because my Super Chipmunk was built really light but it's still a teeny bit tail heavy -- I haven't exactly weighed her yet but I'm sure she's no more than 6.5 lbs All Up Weight (soakin' wet)

Have you compared the APC 11x7 to the MAS 11x7.5?

An earlier statement in this thread was: "According to the power and thrust spread sheet I got from Pe Rievers the 11x7 APC at 11,760 rpm takes 1.03 hp, and gives 6.2 pounds thrust. "

The K&B specs say that the .61 is supposed to be 1.3 HP

What do you think of those apples??

Maybe the MAS 11x7.5 prop can produce the difference of 1.03HP and 1.3HP????

root