Jökull - 01.12.1969, Blaðsíða 114

Windforce 6-7 Bft.
Windforce 8 Bft.
Fig. 3. Diagrams for
estimating ice accretion
on ships with low speed,
as a function of the wincl
force and air and water
temperatures.
Grade of icine' —
1 -No
2 —Low 1—3 cm/24h
3 — Moderate 4—6 cm/
24 h
4 — Heavy 7—14 cm/24h
5 — Very heavy 15 cm/
24 h
Windforce 9-10 Bft. Windforce 11-12 Bft.
Example —
Forecast:
windforce 9—10 Bft
airtemperature — 8° C
water temperature
+ 3° C
Expected icing
according to diagrams:
heavy icing
7-14 cm/24 h
Shipping (Skipaskodunarstjórinn) has in co-
operation with the Director of the Icelandic
Meteorological Office published a questionaire
and distributed it to the skippers of Icelandic
fishing vessels in order to provide information
needed for this purpose. This questionaire is
shown on Fig. 4. I’he skippers are asked to
give information about loading condition of
the ship, position, date and time when icing
started, wind force and direction, state of sea,
air temperature, sea temperature, icing fore-
cast, behaviour of ship during icing, amount
of ice accumulated (measured in cm), in differ-
ent places on board. Included are some quest-
ions regarding the work to remove the ice,
manhours needed etc. The purpose of this
questionaire is to collect further data on the
110 JÖKULL 19. ÁR
actual icing on different types and sizes of
vessels. After obtaining such information it is
possible to calculate the amount of ice and the
approximate raising of the centre of gravity
due to the icing, and therefore to reconsider
the existing regulations regarcling the extra
stability needed for safety under icing concli-
tions. It is hoped that the skippers will be
willing to cooperate in this matter, being so
important for the safety of small vessels.
BRITISH RESEARCH ON ICING
OF TRAWLERS AFTER THE TRAWLER
LOSSES IN 1955
On the 26th of January, 1955, two British
trawlers Lorella and Roderigo were lost with