Stephen A. Lawrence wrote:
The pump is specified by its manufacturer to require drive from a 10 HP engine in order to achieve its rated performance.
Actually, if the manufacture's specifications call for a 10 hp engine, that means anything bigger will wreck the pump. They usually specify the highest power level that can be used with a pump. In actual use most of the time it is a fraction of 10 HP.
Look at it differently. The motor requires 20 watts of input electrical power.
I hesitate to give credence to Neuman et al., but if the pump moves at all with only 20 W input, that is remarkable. 10 hp = 7,457 W. Even at low power, 1/10th the top rated power, it would consume 700 W. Pumps, automobile engines and other heavy equipment of this nature has considerable friction. You cannot usually turn these machines by hand, and you can easily apply 20 W with your hand. (By comparison, peddling a bicycle hard with your legs generates ~200 W.) It is hard to imagine a pump of this size producing any flow with only 20 W.
So there is a mystery here. But it will only be explicable if they give us some real information.
- Jed
