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configuration, variable speed operation, an asynchronous generator,
full pitch control, an active yaw system, and a fully-rated converter
for grid interconnection—all on top of a concrete cylindrical tower
and nacelle (Tvind, 2010).
The group was inspired by the earlier Gedser turbine of
Johannes Juul, but more so, by the design and work of Professor
Ulrich Hütter of the University of Stuttgart. The group reached out
to Hütter, as a consultant, and even made a trip to Germany at one
point to gather his input on their design. Hütter's unique blade
design allowed for the fibreglass strands of the blade root to
be wound around the bolt holes so that the entire piece could
be connected easily to the hub (a task that had been accomplished
on the Gedser turbine by a set of supporting cables).
Figure 5.13
Ulrich Hütter's blade design with fibreglass strands twisted
around blade root bolts, drawing from 1960.
Figure 5.14
Making blades at Tvind (Photos: Tvind).
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