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|  3 blade to 4 blade????? 
			
			Does anyone know how to stay the same rpm range when going from a 3 blade to a 4 blade?? I have a 15" 19 pitch Stainless Rebel(evinrude)prop now and would like to try a 4 blade stainless for some transom lift and bite. Any educated guesses on what size to go to?? I do not want to buy a couple props--they ain't not cheap!!   
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