Pump Definition and 655 Threads

  1. J

    Slightly off topic pump question

    Ok this is VERY WEIRD so bare with me. I play gaida which is an instruments close to the bagpipes in Bulgaria. I would like to BUY or MAKE a footpump for this because I struggle as I don't have the lung-power to play I have tried the type of foot pump used on a rubber raft but this is...
  2. E

    Sodium Potassium Pump: Why Cells Maintain Ion Balance

    Why do cells tend to mantain low internal concentrations of Na ions and high internal concentration of k ions despite the surrounding fluid being low in k ions but high in na ions?
  3. A

    100% efficiency plus hydrosonic pump

    Have any of you heard of the hydrosonic pump? It is an "over unity" device that actually works. It is said to produce about 1/3 more energy in heat than it requires in electricity to produce. It is not a perpetual motion machine because it does not produce enough energy to run itself...
  4. C

    Permanent Magnet Pump Speed Control

    Hi, I have a submerged magnetic water pump that is pushing too much water at 8500L/hr. I know that the propeller rpm depends on the frequency of the AC supply but how can I build a simple circuit to reduce the frequency? Thanks :smile:
  5. S

    Looking for a super high-efficiency air pump

    I am looking for a manufacturer who will be able to custom design an unusually efficient air pump. The most efficient ones on the market right now (or at least the ones I have come across) require about 60 Joules to move just one liter of air. I need something that can do the same amount of...
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