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The generator was an asynchronous electric 11 kW motor. For gear
I found an Allgaier farm tractor rear-thigh at a scrap dealer's shop
in Sundby.
In the same place I found the tower—a rusty 8 m steel tube
that had been used as a drain pipe in a gravel pit, which had worn it
paper thin at one side and considerably weakened it.
Figure 16.6
Preben Maegaard's first windmill design from 1974-1975.
The first version had two airfoil-type blades of 8 m diameter.
Later it had three sail-wing blades. The drive train was an
Allgaier farm tractor rear-thigh.
However, it was not the tower that failed. It turned out that
the blades yielded scaring power during its maiden run on a not
very windy day. I wanted to stop the windmill. However, I found
that I could not turn the self-yawning wind turbine out of the wind
with my hands. While the windmill roared on, I was just in time to
fetch my small Ferguson tractor and fortunately it was possible to
fasten a wire to the nacelle and pull it away from the wind before
something went seriously wrong.
I was relieved and thankful and got my first real-life lesson
within wind turbine design and operation. The windmill was never
started again in the 2-bladed version. According to the fashion of the
times, it was later furnished with three sail-wings and a rudder and
stood there until the area had to be used as a parking lot.
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