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Scotland's Peter Davie emailed: I built one of these dynohub generators.
This has withstood winds in excess of 70MPH perhaps even more. I have never serviced it at all,
I have in an old Perspex box with a piece of vero board with a bridge rectifier and 12v voltage regulator.
This is then connected to a green, red, blue and white LED which at night lights up the garden and the side of the house.
In low wind you do get a slight flashing of the light but up until now has not affected the LEDs.These generators are absolutely amazing.
OK you are never going to run the house but for charging a battery or a simple lighting project they are great fun.
U.K. student Shaun Solari built this dynohub generator from gotwinds plans and made a few alterations - using the framework of an old
swivel office chair he found - it was a ready made yaw bearing.
He went for the more simple pvc blade design bolted to a wooden disc and attached to the dynohubs outer rim.
'It works really well by the way' - I also have a bridge rectifier and voltage doubler fitted so I can charge up 12v batteries -
the whole reason for the turbine was to power a small fan as part of the heat sink in my greenhouse (as per Not Easy Being Green).
Lawrence Richardson's successful attempt, using the 21" diameter aluminium propeller design from the plans,
and simply using angle iron as the chassis of the generator.
Andy Hawk's pairing of the P.V.C blade design and dynohub worked, but only in strong winds, 'The dynohub doesn't produce much power so I am getting
a tread mill motor that will produce more power hopefully.' He utilised a bike frames headset as the yaw bearing, and rear chain stay as the tail boom.
Claude Violette purchased the latest pvc blade plans and made a hub from the base of an aluminium frying pan of all things..
he chose to add an extra blade for more 'push' as he puts it. and extended them to a total of 5ft diameter. They look very good.
You can use 4 blades, the benefit of 3 blades is there is no other blade opposite one another that can cause balancing problems.
This is why most commercial wind generators have an odd number of blades, 3 or 5 typically.
'Super windy' bought a 1.75 Hp Treadmill motor for £35 on eBay and connected his hand carved wooden propeller.
He used an aluminium frying pan as a hub! - and it works admirably apparently. He decided to try the p.v.c blade design aswell.
The 4 blade had better start up, but the wooden 3 blader was very fast as expected.
This dynohub wind generator design was found on eBay UK, and supposedly made by a company called selectramarine in Poole.
It has a 17" diameter rotor and uses the sturmey Archer GH6 as it's generator. I think this size of rotor would need considerable wind to operate.