Very good picture. With the spiral of sheet metal instead of a solid 
cylinder, you can really see what's happening. Though there are some 
units that the tube is fixed, and the screw only rotates.

On 7/9/2010 10:42 AM, RussellMc wrote:
>> When stopped, it
>> doesn't take long for all liquid to drain down to the bottom pool
>> elevation. The clearances I was talking of were compared to a turbine
>> aircraft engine, where the blade clearances are in thousands of an inch.
>> The tube does not become near total full of liquid, but maybe 1/4 full,
>> and the motion of the screw is fast enough to overcome the natural flow
>> of the liquid down, much like  a leaky bucket elevator.
>>      
> Note that the "screw binded to outer wall" version does not leak at
> all when stationary. It will retain all fluid and restart immediately
> where it left off when restarted (with suitable allowances for reality
> such as a bit of slop and surge).
>
>
> SUPERB EXAMPLE :
>
>         http://www.swansea.ac.uk/grst/images/Archimedes'%20screw.jpg
>
>
>
>         Russell
>
>    
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