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push vs pull vis a vis rudders
Steven Shelikoff wrote in message ... On Thu, 1 Apr 2004 11:45:50 +0100, "JimB" Your experiment seems to be flawed if you're trying to look solely at lateral force with no fore and aft motion permitted and yet you get a lot of for and aft swing. To prove to myself again that there is a lateral force even with no fore and aft movement, I put a string around the bottom end of the spatula which would allow it to swing laterally but hold it from being moved toward the fan. So, we have a plastic spatula hung by the little hanging hole at the top from a hook which allows it to swing in all directions like a pendulum but I can firmly control the angle of the blade by turning the hook. And there is a string looped around the handle just above the blade which I can hold to prevent the blade from moving towards the fan so there's no fore and aft motion. Result: same thing. When it's behind the fan and you turn the blade so that it's not perpendicular to the fan, the spatula swings *only* laterally since there's a string keeping it from moving toward the fan. Nice one Steve. I'll have a go at it, and then try to work out what else is wrong with my mechanism, though I must admit the results first time were not easily repeatable. So much depended on the relative distance fore and aft and left and right from the fan. Luckily, in a few weeks I'll get my hands on a real boat and double check! JimB |
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