Bravo3 4 Blade Front Prop

[capav8r]

So, I snagged a set of B3 props on ebay for very cheap. They are the new design which is a four blade on the front and the usual 3 blade on the back. The pitch is 1 higher than my current 3x3 setup. According to Mercury's prop selector, this would be the correct pitch with the new design, 4 blade set. Here's the question: What improvements will the 4 blade make??