How do aircraft engines limit revs?

the formula is a triangle at which point do you want to start the change. Torque/RPM/Power

I can lighten the load, RPM will increase. Torque may not.

any time you change one point it will effect one of the others but maybe not both.

Right, I was using RPM as the fixed point. As you increase fuel/air you have to increase pitch to absorb the extra power which will increase torque. It's all the same just depends where you want to start as to how you look at it. In the end it all comes out the same in the RPM*Torque=Power; Power/RPM=Torque; Power/Torque=RPM equation sets regardless what you solve for. Prop pitch and fuel/air flow are the tools we use to manipulate and define the limits.
 
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