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foot propelled jet ski?
Hmmm... thrust - drag = mass X acceleration
Brian Whatcott On Wed, 19 Oct 2005 07:04:02 +1000, "barry lawson" wrote: Willliam, Consider the basic principle that thrust = mass x velocity, but power consumption is proportional to !/2MV2. This means that while a small jet at twice the speed has the same thrust as the larger jet at twice the area, the power consumption is four times greater! Big Slow Pumps! For anyway near the same effectiveness the jet area needs to be around the blade area of an oar. Regards barry lawson "William R. Watt" wrote in message ... My main concern is the amount of propulsion that could be provided by foot operated water pumps. I imagine a slow pump action, using, say 3" plastic drain pipe for the pump body. I'll guess have to get out the college physics text and try some calcultations. Anything I should take into consideration? |
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