I've lost the article for the moment, but ATA magazine wobbled on about a US manufacturer who has knicked my brilliant idea of making whirlygig thingies into a Savonius motor as well as still extracting air.

They were looking for agents.


Colin



:: Has anyone had any experience with small windmills / wind
:: turbines for power generation.
::
:: There are numerous websites with details of all the normal
:: players and then some. I'm investigating devices which are
:: small and relatively indestructible. Aim is a power
:: generation capability in the 100's of milliWatts to few
:: Watts range with an emphasis on longevity and leanings
:: toward operation in a wide wind speed range,simplicity, low
:: cost and audible impact. Minimisation of size is not overly
:: important as they are liable to be small enough that one
:: several times larger than an optimum output model is liable
:: to not be overly large.
::
:: The much derided Savonius design may have some advantages
:: given the above focus on priorities.
::
:: For interest I offer the following empirical and so far
:: untrammelled by reduction to practical test formula for the
:: upper speed of a Savonius windmill.
::
::    RPM <= 15 x V /d
::
::        V = windspeed in metres per second
::        d = diameter in metres.
::
:: This says that eg a Savonius built with wheelbarrow buckets
:: (as they do it on Oz) and a 2 metre diameter would not spin
:: over 150 RPM in a bracing 20 m/s 'breeze'. (70 kph / 50
:: mph). Just as well! For a given power this 'explains' their
:: large torque (also arrived at by other obvious means).
::
::
::        Russell
--
cdb, colin@btech-online.co.uk on 10/03/2008

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