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Its real easy to test, as I can get my folding 3 blade to stay open. I can
see the boat speed, then have it fold and measure the speed. It is significant. If the MIT tests say otherwise then they are not testing reality - wanna guess what errors they made in the test or you in the interpretation??. Paul www.jcruiser.org "JAXAshby" wrote in message ... You will definitely will see a decent speed improvement under sail with a folding prop no, you won't. folding props only hve value for racing boats, where 2 seconds a mile means the difference between 2nd place and 6th. According to MIT tests, a folding prop means a savings of a mere 170 pounds drag at 5 knots (or 40 pounds drag at 2-1/2 knots, or 10 pounds drag at 1-1/4 knots) over a --------- three ------------ blade prop. ***Much*** less with compared to a two-blade, and even less compared to a two-blade rotated verticle behind the keel. Wanna guess just how much powered is required to pull 170# at 5 knots? |
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