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On 1 Jun 1994 I (A.APPLEYARD@fs*.mt*.um*.ac*.uk*) wrote:
  > ...  a motor and propeller pack [made by Dacor, I now remember] which the
diver strapped to his back over his cylinder. The firm showing it claimed good
speed and endurance for it. Have any of you come across anything like it?

  On Thu 2 Jun 1994 09:54:32 +1000 (EST) Howard Anders <h.anders@tr*.oz*.au*>
wrote (Subject: Re: scooters):-
  > ****** I saw a device like this in "Practical Science" magazine a few
years ago. It was actually powered by compressed air from your cylinder. I'll
see if I can find the magazine and pass on more details. Cheers; Howard Anders

  I read a few years ago of a type of twin-hose regulator (= old-type, large
round on the cylinder top) where the pressure drop as it supplied air to the
diver, was not thrown away but drove a small propeller. To get enough power,
the diver had to breathe fairly hard, i.e. if he idled, he did not move much,
but if he swam fairly hard it gave him more power above his swimming power.

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