I was wanting to get a spare prop and was wanting a 4 blade to help when I知 on Lake Erie. Is the 21p revolution 4 4 blade to much pitch. ? I found a used one of these very reasonable I知 not real knowledgeable on this and was looking for advice. I was just looking to get a spare used prop and figured I might as well get a 4 blade to help in the big water the 4-5 times I知 on it a year.