Sorry I had a typo. I stand corrected, the Moki 2.1 thread in Tachometer Readings talked of a 20X10 (not 22-10) in the 7-7500 rpm range. Just didnt proof read my math [X(]

They talk of the Moki Ultra 20/10 prop 7660 rpm on no nitro fuel.

Here is a quote from Scale Speed in that same thread" Hi Guys:
I have two Moki's and the 2.1 is definitely stronger. I am running a Moki 20-8 prop in a 1/3rd scale Pitts @ 15-1/2 lbs. and it turns 8500 on the ground using Byron 5% with 18% oil. I have unlimited vertical and can pull up out of a hover with easy. More than enough power for this airframe. My 1.8 is in a Hanger 9 Cap and what a combination. Knife-edge loops aren't a problem with a Moki 18-8 prop. Scale Speed"

Now the question reapplied for an 85-87 inch platform that might easily balance and to what 3D capacity might it have. Otherwise, I might wait a few more months to sell the moki and come up with extra cash for gasser.