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Angle of prop shaft - theoretical question.
On Sun, 06 Jun 2004 00:28:20 -0400, Wayne.B
wrote: On 05 Jun 2004 22:44:53 GMT, (Shen44) wrote: the basic issue (propwalk) is caused by prop rotation and all other factors may assist or decrease it, but the basic "phenom" occurs when you rotate the prop. ============================================ Of course, but what is the cause of the asymetric thrust? THAT is the question. Everyone agrees that a prop with a horizontal shaft still exhibits prop walk, implying that the bottom the prop is more efficient at providing thrust than the top. Lots of theories have been provided but none that seem totally convincing since prop walk still exists to one degree or another on deep props, that have plenty of hull clearance. That's probably because it's a combination of several effects that all contribute. Anyone who throws any theory out there that contains as part of it's explanation some way that the thrust on one part of the prop is different than on another part of the prop is probably correct. Also, any explanation that contains part of it's explanation some way tha the thrust from the prop gets translated into a rotational force on the boat is probably correct. For instance, no matter how deep the prop, the water on the lower side is still going to be under ambient higher pressure than the water on the top. So by moving the prop far away from the hull you may have minimized the effect of hull turbulence on the top part of the prop. But you haven't done anything about the pressure difference. Steve |
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