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The recommendation I am reciting was the 19" pitch was found to be ideal for the highest performance with a light load.

The 17" is good for varied loads.

Given your intended use, it will take some testing. I would start with a 17" and then move down to a 15 in that same model and size.

If you change brands, the prop size may be completely different since blade designs are unique.

The challenge is finding a shop that will loan out props for testing.