2 blade props are more efficient and are what I would recommend for the Zelos. 3 blades can be useful when you need more thrust without increasing overall diameter to counteract problems on V-bottom hulls. I've setup my Zelos with 2 blade props for everything from 60mph to 100mph. Dasboata (Chris Hoffmann) can get you setup with a pair of sharpened, balanced, and heat treated ABC props depending on your ultimate goals for about the price of what you're already looking at on eBay.
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