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On 12 Jan 2005 11:57:08 GMT, (JAXAshby) wrote:

If you can relate your calculations to pounds of thrust, figure about
1 hp for every 30 pounds thrust, e.g., 300 pounds of thrust is roughly
equal to 10 hp.

ah, no. thrust times rpm / 60 / 550 = hp. (IIRC) 30# of thrust at 4,500 rpm
is 3x the hp of 30# of thrust at 1,500 rpm.

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We are talking about thrust into the water, i.e., bollard pull as the
tug boat folks like to call it:

http://www.hydrocompinc.com/knowledg...ollardPull.pdf