Now which throttle do you pull on a 4-engine prop? Or do you guess on the first pull?
No guesswork involved with the large American radial piston engines...you look at the torquemeter (BMEP gauge) and it will tell you straight away, if the engine is developing BHP...or not.
feather - with the prop lever.
Not on the abovementioned types.
A propellor feathering pump is used to drive the prop blades to the feathered position.
Just....push the feather button.