Tidal times and streams in Queenstown, April 11 1912


Nov 26, 2016
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Titanic left Queenstown at April 11 in 1912.
Between 2.20 pm. and 5 pm. she was on the way between Daunt Rock and Fastnet Rock.
I want to know the strengh and direction of the tidal stream at this time.

Firstly I looked up the times of the moon phase with a moon phase calculator:

moon phases 18. Mär. - 16. Apr. 1912 (Lunation: -1086)
new 18. 03. - 22:10 -
half 26. 03. - 03:00 - 7d+5h
full 01. 04. - 22:00 - 7d-h5
half 09. 04. - 15:30 - 8d-7h
moon phases 17. Apr. - 15. Mai. 1912 (Lunation: -1085)
new 17. 04. - 11:40 - 8d-4h lapse time to preceeding half: 8 days less 4 hours
half 24. 04. - 08:50 - 7d-3h
full 01. 05. - 10:20 - 7d+2h
half 09. 05. - 09:60 - 8d+0h

April 11 is 2 days after half moon.

To find the tide times I use a book with tide tables of 2000.

The next step was to find a moon phase in 2000 with similar time period between new moon and preceeding half:
Two samples are in question:

moon phases 01. - 30. Jul. 2000 (Lunation: 7)
new 01. 07. - 19:20 - 7d-6h
half 08. 07. - 12:50 - 8d-7h
full 16. 07. - 13:60 - 8d+1h
half 24. 07. - 11:00 - 8d-3h
moon phases 31. Jul. - 28. Aug. 2000 (Lunation: 8)
new 31. 07. - 02:30 - 8d-8h lapse time to preceeding half: 8 days less 8 hours
half 07. 08. - 01:00 - 7d-1h
full 15. 08. - 05:10 - 8d+4h
half 22. 08. - 18:50 - 8d-10h

July 26 in 2000 corresponds to April 11 in 1912.

moon phases 25. Nov. - 24. Dez. 2000 (Lunation: 12)
new 25. 11. - 23:10 - 7d+8h
half 04. 12. - 03:60 - 8d+5h
full 11. 12. - 09:00 - 7d+5h
half 18. 12. - 00:40 - 7d-8h
moon phases 25. Dez. - 23. Jan. 2001 (Lunation: 13)
new 25. 12. - 17:20 - 8d-7h lapse time to preceeding half: 8 days less 7 hours
half 02. 01. - 22:30 - 8d+5h
full 09. 01. - 20:30 - 7d-2h
half 16. 01. - 12:40 - 7d-8h

December 20 in 2000 corresponds to April 11 in 1912.

3rd step: look up tide times and heights for Cobh and Dover for these two days:

July 26 in 2000
----------------------------
Cobh ####### Dover
06.29 1.1 m ## 00.21 1.8 m
12.23 3.5 m ## 05.46 5.5 m
19.06 1.1 m ## 12.54 2.0 m
01.00 3.6 m ## 18.20 5.6 m

December 20 in 2000
---------------------------
Cobh ######## Dover
00.32 3.5 m ## 01.06 1.9 m
07.17 1.0 m ## 06.31 5.8 m
13.12 3.6 m ## 13.43 1.6 m
19.52 1.1 m ## 19.21 5.6 m

Result tidal times:
High water in Cobh: 12.23 ... 13.12
Low water in Cobh: 19.06 ... 19.52

Assumption: Titanic had a stream in the back between 2.20 and 5 pm.

4th step: Consult tidal stream atlas for Irish sea and Bristol channel.

This atlas contains 13 charts showing streams at hourly intervals related to HW in Dover.
High water in Dover: 18.20 ... 19.21, say 19.00
Charts to be applied: 5,4,3,2 hours before HW in Dover.

Streams at south east cost of Irland, near Rosslare and Waterford, 7 degrees west:
5h before HW: 0.7/1.3 knots ENE, neap/spring rate
4h before HW: 0.9/1.7 knots ENE
3h before HW: 0.8/1.5 knots ENE
2h before HW: 0.6/1.0 knots ENE

Based on these findings I can not make any conclusions about streams in the vicinity of Queenstown.
I exspect a current in westerly direction to the Atlantic, but the current at the south east coast is directed to ENE. The highwater of Cobh seems to distribute partly to west and partly to east. Finally there might be no current at all.
Who can help out of this?
Find attached chart 4 hours before HW at Dover.
 

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Last edited:
Nov 26, 2016
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The UK Hydrographic office provides several tidal stram atlasses, but none covers the coast between Cobh and Fastnet Rock.

The Atlas NP250 covers the north coast of Cornwall, may be the conditions at Fastnet Rock are similar.

Streams at north west coast of Cornwal:
5h before HW: 0.1/0.3 knots ENE, neap/spring rate
4h before HW: 0.2/0.4 knots SW
3h before HW: 0.5/1.0 knots SW
2h before HW: 0.6/1.2 knots SW
average stream 5h ... 2h before HW in Dover: 0.4 knots SW
 

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