Just playing around w/ the Thrust program http://freespace.virgin.net/barry.hobson/ I try to guess what my equipment produces.

So I run a 18.1x10 APC on my YS 1.60 at about 8300 rpm, the program works that to 20-22lbs thrust; on a sub 10 lb plane is nice. I compare to a 17x12 APC at 17 lbs thrust.

The program also works the HP numbers.

So if you take ZDZ s word for there HP on the 40F3A and a 22x10 menz, reduce the RPM till the HP meets ZDZs number it shows 27lb thrust. So, that RPM is 6300 for this HP and prop. I think thats the RPM the Electric's run at or close to it..??

Ive never quantified this but just played around with it to get ideas.....ya..got to much time on my hands.[8D]