According to ThrustHP (it's a free program, I don't remember where I got it, do a google search and it'll come up):

14x7 3 Blade at 8750 RPM = 17.7 pounds of thrust
Same with a 14x8 at the same RPM.

That's assuming a MA style blade. APC = higher by a pound or 2

This seems optimistic though...I've got an OS 70 four stroke that will onlyput out about 8 pounds (measured in real life), so I doubt you're getting 10 pounds extra. But it's a fun program anyhoo.


Reid