Dan and All,
It seems that most overshot wheel designers reccomend that the rim speed be
kept low, down to 6' or 3' per seccond. They usualy use a 1' spacing for
the buckets. At say 4' per seccond rim speed you will have 4 buckets
passing per seccond so the buckets must be large enough to accomidate your
flow rate . This was gleaned from 20 years of water wheel research and
seemed to be the concensous of many people from the builders in the last
century and the earlier years of the 20 th century. I used the
Encyclopedia Brittanica (1910) as well as many references of the period when
water power was used more than steam or of course other later forms of
Are you building a steel or wooden wheel? Have you considered any of
the turbines? Success to
you, Robert Hubbs
----- Original Message -----
From: Dan J Youngs <dany18@...>
Sent: Thursday, August 31, 2000 3:10 AM
Subject: [microhydro] Water Wheel Bucket Size??
> I am building a 12 ft diameter water wheel, I need to calculate the
> width, depth and distance between buckets. (Volume). If practicle I was
> going to pick 18 inches wide.
> I have 300 cu. ft./ min flow most of the time, Sometimes less, 20% of
> the time lots more, I am thinking the 300 cu ft number should fill the
> buckets 1/2 to 2/3 of the way so I could benifit from the times I have
> more flow. ????
> I have a total of 17 ft of head, I am leaving 2 ft under the wheel, That
> gets me to 15 ft, That leaves me 3ft to play with between the top of the
> dam and the top of the wheel, The dam is 500ft away from the wheel. I
> am planning a flume with 4 sq ft of cross sectional area to deliver the
> water. The 12 ft diameter wheel will fit inside the power house, this
> will help during freezing temps.
> I need help how to choose the right volume for the bucket, I think this
> should be based on flow and angular velocity of the rim of the wheel,
> but I am not sure where to start.
> Also what RPM will this thing turn?
> I would love to see how to find the answer rather than just the answer.
> Thanx, Dan
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