Steve,
I usually use and APC prop on my electric.  Presently using a 13 inch on my new Crossfire.  I got hold of both an 11 and 12 inch Xoar three blades and tried the 11 as it was all  that would fit in my  spinner.  The 12 inch had a much wider hub so wouldn't fit in the 1.75" spinner. I tried the 11 but felt I needed more diameter.  I ended up making a 12" from a couple of 2B Xoars I had with 5" pitch.  The hub on mine would fit the Precision Aero spinner I use.  The prop was quieter than the APC but lacked authority in the vertical and overhead parts of the pattern.  I've got a few Xoar 12 X 6 pitch props on order and will make another 3B sometime this summer.  For now I'll stick with the APC or try a modified Eather 3B if I want to expend the effort.
Alan Resinger     

Larry,
As far as I know all Xoar wood props are tractors.  The only pushers I've seen are some carbon 12 X 5 props that are sold in pairs of one tractor and one pusher for RC helicopters.  Last year Percy Attfield was here in Vancouver and was using one of the pushers.
Alan

hi all
as for 3 bladed props Barry Robinson is making theses  ,all sizes from 10inch upwards ,very light and pushers as well as tractors ,pitch 6 inch
i won a comp using one last weekend
contact me as i am selling them
paul

Hi Paul, Could these be used on IC as well? like 4-strokes etc