ORIGINAL: combatpigg
I've used mine to help develope props that nobody makes. For example, 7x2 & 8x2 sizes for small 3D glow projects. There are other examples where no "off the shelf" prop for your application is readily available. I'll bet the Wright Bros. did thrust testing before committing to a final prop design.
How did you change the pitch of a prop? I am curious because I am looking into this for a future project.