Environmental Engineering Reference
In-Depth Information
A similar turbine was erected in March 1941 at the B&W
shipyard in Copenhagen, but for the rest of the FLS Aeromotors,
as the new turbines were named, the steel lattice tower were
replaced by tubular concrete towers. This choice was partly made
because of the lack of steel during the war, but also because this
type of tower could be delivered by the company Danalith—a
member of the FLS group, specialised in reinforced concrete
constructions. In May 1941, the first Aeromotor with a concrete
tower was erected in Nexø on the island of Bornholm. Standing
a few metres from the shore, it was a possible candidate as the
world's first ofshore wind turbine.
Figure 3.17
The 2-bladed FLS Aeromotor (Photo in the FLS files of the
Danish Wind Historical Collection, DVS) (left); the 3-bladed
FLS Aeromotor (right).
Later during the same year, seven more 2-bladed Aeromotors
were placed at Danish power stations and early in 1942, a 3-bladed
version with a 24 m rotor and a 70 kW generator was presented.
During the war, thirteen 2-bladed and seven 3-bladed Aeromotors
were built. Despite the very short development time, rather few
technical problems occurred. The worst problem came very soon
after the testing of the first turbines with concrete towers. At
maximum speed (90 rpm for the 2-bladed and 60 rpm for the 3-
bladed version) the frequency for the blade passage in front of
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