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Finnegan you are right. I have the 13" 4 bladed for pulling a tube and at WOT I will not over rev. still get up to 5900/6000 rpm with just a slight (2-3 mph) drop in speed.
Yes with the boat loaded and pulling, she does get onto plane a little faster and easier but loaded standard (2 people + gear (600+lbs) the standard Venegance SS prop is smoother and not using a stop watch you couldn't tell the difference in time getting onto plane compared to the aluminum 4 bladed prop and top speed is better (when needed).
I use the same Flow-Torq III for both props as they are inter-changeable for these "Big-Foot" 60HP Mercs.