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Only if the 6.5 hp motor and propellers have the same thrust efficiency as the 13 hp one. As the propellers get smaller and spin faster, the efficiency usually drops and if you're getting, say, 50lbs of static thrust from the 13 hp one, you will probably get slightly less than that from two 6.5 hp ones combined. So instead of 100 lbs from the three, it ...

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