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Mario Ferrari wrote:
>
> A Lego testing machine for Lego compressors... wow, one of the coolest Lego
> things ever seen around!
> I love the idea and love your implementation, and find your results very
> useful.
>
> BTW, I think that the Ralph Hempel's double-action compressor performs
> sub-optimally due to the fact that it doesn't use the full stroke of the
> pumps. Michael Powell's compressor drives the pump with a medium pulley
> instead of the 24t gear. The distance between two opposed holes in the
> pulley matches exactly the stroke of the pump, while in the 24t gear the
> holes are slightly closer.
>
> Mario
>
> http://www.geocities.com/~marioferrari
Yes, Michael Powell's design complies fully with the Lego geometry which
I have tried to emphasise all the time in my web pages. It has probably
reached the theoretical limit of efficiency for the small pump. It will
be difficult to build another compressor that can surpass his mini
compressor.
On the other hand, Ralph Hempel's double acting compressor doesn't quite
match the Lego geometry, so the pump is not compressed fully as you have
rightly observed. And two pumps are not necessarily better than one.
So it's a question of Lego geometry, really.
--
C S Soh
cssoh@singnet.com.sg
http://web.singnet.com.sg/~cssoh
...where air is power
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