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Off topic question about propellers or Impellers....

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Off topic question about propellers or Impellers....

Old 01-01-2005, 10:09 PM
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SkyMutt
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Default Off topic question about propellers or Impellers....

If you were to place a propeller or a Impeller in a running stream while keeping the propeller stationary, but still able to spin, would the flowing water turn the stationary propeller or impeller like the turbines in water dams? This is for a small portion of a college project and i dont own a RC boat to try this on. I figured you guys would know best.

thx for your help
Old 01-02-2005, 04:20 PM
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stevblutu15
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Default RE: Off topic question about propellers or Impellers....

it depends, how fast is the stream flowing, comparred to how much resistance there is on the propeller. if there is no resistance i believe it will spin.
Old 01-02-2005, 05:43 PM
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Nate-RCU
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Default RE: Off topic question about propellers or Impellers....

Without a doubt it will spin, but to get any useful work out of it would require processing the water first. Most conventional dams use "head" and its effect on velocity before it acts upon the turbine. Your initial question is akin to holding a pinwheel into the wind. It will turn.

Your project sounds interesting

Good luck,

Nate
Old 01-02-2005, 05:47 PM
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LtDoc
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Default RE: Off topic question about propellers or Impellers....

SkyMutt,
The quick'n'dirty answer is, yes. The longer version is that it would depend on the force of the water exerted on the propeller, the pitch of the prop, the diameter of the prop, and the internal mechanical resistance (friction) of the system (plus a little fudge factor for 'slippage'). Increase the speed of the water movement and you increase the amount of work that can be done (for the same volume of water). Or, looking at it from another direction, instead of all that water going around the sides of the prop, funnel it through a venturi (hmm, just like a hydraulic turbine, right?) to increase the work output.
- 'Doc
Old 01-02-2005, 06:45 PM
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SkyMutt
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Default RE: Off topic question about propellers or Impellers....

Thx for everybodies help, Ill get started on my project ASAP.

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