My Bravo 3 impeller disintegrated at 375 hours in the middle of my fourth season. I think I sucked up some sand the week before, accelerating the demise. It left my wife and the dog we were watching a little upset as we sat in the middle of the Broads for over an hour on Fourth of July weekend. I was very happy to see the TowboatUS guy, I think he saved my life
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So now I replace the impellers every third season. It's still a little risky but now I have two engines.