Bolly's website is located @
http://www.bollyprops.com.
Both the MVVS .49 & the OS 50 have plenty of power to pull the APC 12.25-3.75 with unlimited vertical acceleration...The issue is trying to get a higher RPM at the hover power settings so that the engines are "on the pipe."
I trimmed .200" from the rear of the Zinger 14-4 & blended the rear face to the new front edge. I will probably try it tomorrow.