last spring I had a plane and engine combination , that I felt that I had to get the most pull out of the engine.

I put a fish scale on the tale of the plane and measured the pull of each prop gave. It worked great, found the prop that gave max pull.

I used a second safety line to make sure it did not take off, be careful

I can't say it was accurate , but it was a good and easy way to select a prop.

sticks