Help me build a bicycle powered water pump.
So I got drafted into putting together a human powered water pump for the neighborhood Green Fair. I tried to tell them I'm a civil engineer, not mechanical, but to no avail. So I thought I'd ask y'all for suggestions.
Anyway, the organizer is interested in a demonstration pump similar in concept to the Playpump
, so that the local kids can pump water from Bucket A to Bucket B. Eventually the pump will end up at the community garden to be used to pump water from the rain barrel onto the plants.
So the basic requirements are:
1. Relatively cheap (hopefully the bike will be donated)
2. Somewhat durable. It won't be used 24 hours a day, but should be able to stand up to rowdy kids and semi-regular use in the garden.
3. Reasonably efficient, so that a normal person pedalling at a moderate rate can move 3-4 gallons in a few minutes.
It'll be drawing out of a rainbarrel so it won't need to generate a lot of suction, nor will it need to blast the water out of the hose.
I was thinking of trying to salvage a waterpump from a car and fitting it with a sprocket. Is this a reasonable idea? Any other suggestions for cheap, nonelectric pumps? Will the gear ratio be enough to get any volume out of the pump or should I try something different? Has anyone built anything like this before?