Recently I've started to experiment with both 3 blade and 4 blade props.
The setup that seems to work best on my Smaragd with a YS 140DZ is the APC 15x11 4 blade. It seems nice and slow while allowing plenty of power.
I'm also trying different props on a Temptation with an OS 1.60. I havn't quite decided on this setup yet and will soon try a Dave Lockhardt 15.75 X 12 repitched 3 blade.
I would be interested in hearing who is using these props and what type of results your getting with them.
Another aspect of the 4 blade on my Smaragd 140DZ is setting up a good cruise speed with my throttle curve. Does anyone have a firm RPM # that they look for in a cruise speed?
So far the experiment has yielded a plane that I think is easier to fly then what I was getting out of any 2 blade I had tried. Thanks, Mike