Jökull - 01.12.1969, Side 116

Fig. 5.
Rigging arrange-
inent of a British
trawler from 1948.
all hands, 40 men, north-east of Hornbjarg,
northwestern Iceland. Although icing was well
known to be hazardous in northern waters,
these losses led to a special research of the
nature and effect of severe icing, such as might
be encountered by trawlers. The British Ship-
building Research Association (BSRA) carried
out a study of the ice accumulation on a
1:12 scale model of a type of British trawlers
common in the years 1948 to 1955. The tests
were carried out in a climatic chamber at
Weybridge. After the tests were finished a very
interesting and well known report was publish-
ed (BSRA 1957). Lackenby (1960) has also clis-
cussed the results of this research. Since these
reports are available in English, only some of
the results and some comments need to be men-
tioned here. The icing experiments were car-
ried out in climatic conditions thought to be
similar to those prevailing when the two trawl-
ers in question were Iost. These conditions
were obtained by spraying water into the re-
frigeratecl chamber by compressed air.
One of the most interesting conclusions
reached after these tests includes the variation
in the amount of icing of a then commonlv
rigged trawler with the conventional foremast
with forestays, rigging, shrouds and derrics
and a trawler fitted with tripocl mast, with
Fig. 6.
Typical
ice formation
with model
head to wind.
Estimated
ice weight
equivalent to
140 tons.
112 JÖKULL 19. AR