Maggie’s Motivational Pic Thread v2.0 - - New Rules - See Post #1

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The downside with outboards is it takes blade area in the water to push the boat, and outboards are pretty limited in that reguard. So that's usually when you start seeing a bunch of outboards, more props to push the load.
How much efficiency do you lose by having so many (5 or 6) props so close together? I'd think that you'd get some drag from all of the vortices forming right next to each other, at least in the center.