Cruise prop vs altitude

[flyguy]

Anyone interested in talking about what kind of prop gives the best performance at 75% power (full throttle) at 8,000 ft. At what altitude are "cruise" props optimized? I have an 85 engine with a 72" prop, but I am thinking about generalizations here.
Darryl

[Vasey fan]

Re: Cruise prop vs altitude

As a general observation, & without bringing in pressure/density altitude computations, my 85 has to be around 10K msl before I can run at full throttle without exceeding 2450 revs. The prop is a 72 (I think) & barely makes 2100 (minimum) static.