I guess the correct answer to Chris is “No, I have no idea how much power I’m developing but would be curious to know”. 

Larry,

 

I apologize for my "rant." BUT, I have been in search of 75% power for many years with no relief.  I am just as curious as you.  I am ready to tie the tail to a fish scale (attached to a steel hangar)  and see just how much thrust I've really got.  It is the only meaningful number. 

 

Of course, aviation engines max BHP is measured at 59F, zero MSL (29.92"Hg) while SAE BHP is measured at 77F, 29.235" Hg, realistically about 700 MSL (Note that both assume 0% humidity).  There is an immediate 5% difference in HP, not counting the effect of water vapor.  At least the SAE folks know the engine is not operating ideally at the surface of the sea where, somehow, there is no moisture present. 

 

My engine builder said I had a "strong" engine because the club was turning at a higher rpm than usual.  Uh, I think that's torque.

 

Constant Speed props hide the truth further by not giving us the "gear ratio".

 

Good Luck,

 

Grayhawk

(Too old to care about minutiae - just try to fly alongside me at WOT, 2700+ RPM)