8) piranha props run pretty dam good when the're used as a primary prop. especially if your prop takes on any impact you only run the risk of damaging the blades which are interchangeable and replaceable so it makes things eaiser, not to mention spare blades only cost twenty dollars a piece. I'll tell ya its pretty nice carrying spare blades on my boat compared to a bulky prop. check out the prop picker on their website at
www.piranha.com its got a simple way to fit the right prop to an engine if you know your make, year, and hp.