brake horsepower rpms vs max rpms - propping

[Joseph Elliott]

When you are propping are you looking to use the max rpms possible for the motor or the manufacture's certified brake horsepower rpms? for example my motor has a max rpm of 6000 but the horsepower(60) is certified brake at 5500 rpms.

[teecro]

You are looking to avoid going over the Owner's Manual recommended Wide Open Throttle setting...

[Joseph Elliott]

Ok, Thank you. Also my owners manual has a list of approved props to use with this engine, are there any risks to deviating from the sizes listed? No worries about warranty, its a motor from 1980.