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I suspect the 5hp difference is smoke and mirrors. I would be surprised if it makes any real discernable difference. My question is why are you concerned if you get 43 mph or 44 mph? Its not going to make any difference on when you get to a particular place. You have to go tens of miles before the time might add up. Wind, currents and waves are much bigger factors in travel. There certianly no negative effect because you are not running at the very possible fastest speed. Others have also gone down the path of getting the absolute max out of the rigs, but I have never understood it. If you are seriously into 'go fast' there is probably better choices than these rigs.
I have no knowledge of the effects of 4 bladed props.
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