Thursday, 21 April 2016

DRAUGHT COMPARISONS.

The following comparative steamers all had significant top hampers, but crucially, significantly lower maximum draughts compared with Waratah.

SS Otranto:

Type:Passenger liner 
Tonnage:
Length:535 ft 4 in (163.2 m)
Beam:64 ft (19.5 m)
Depth:38 ft 8 in (11.8 m)
Installed power:14,000 ihp (10,000 kW)
Propulsion:
Speed:18 knots (33 km/h; 21 mph)
Capacity:
  • Passengers:
  • 235 1st class
  • 186 2nd class
  • 696 3rd class

mean draught 25.75 ft. 

Note that although Otranto had a similar depth to Waratah (38 ft. 8 in. vs 38 ft. 6 in), she was registered for a max mean draught of 25.75 ft., not 30.375 ft.



SS Otranto



SS Falaba

details
tonnage4806  grt
dimensions116 x 14.45 x 7 m
materialsteel
engine1 x 3 cyl. triple expansion engine, single shaft, 1 screw, 4 boilers
power424  n.h.p.
speed14  knots
yard no.414
IMO/Off. no.124000

mean draught 22.9 ft.




SS Falaba



SS Dongala

SS DONGALA                                      SS WARATAH

Built:           1905                                                    1908
Builders:      Barclay, Curle, & Co                          same
Gross tons:   8038                                                   9339.07
Net tons:       4723                                                  6003.96
Length:         470 ft.                                                465 ft.
Beam:           56.25 ft.                                             59.45 ft.
Draught:       27.75 ft.                                             30.375 ft.
Engines:       twin quadruple                                   same
Power:          8000 ihp                                             5400 ihp

mean draught 27.75 ft.

Note 8000 ihp vs 5400 ihp.



SS Dongala



RMS Morea

  • Gross tonnage: 10,890 grt                                                   9339.07 grt   
  • Net tonnage: 5,960 nrt                                                        6003.96 nrt   
  • Deadweight: N/K
  • Length: 164.53m (540.0ft)                                                   465 ft.     
  • Breadth: 18.65m (61.2ft)                                                     59.45 ft.   
  • Depth: N/K
  • Draught:  7.53m (24.7ft) - corrected.                                  30.375 ft.  
  • Engines: Quadruple-expansion steam engines                     similar 
  • Engine builders: Barclay, Curle & Co Ltd                             same
  • Works: Glasgow
  • Country: UK
  • Power: 13,000 ihp                                                                 5400 ihp 

mean draught 24.7 ft.

Note 13 000 ihp vs 5400 ihp.


RMS Morea



SS Anchises

SS Anchises:                                                      SS Waratah:

10046 gross tons                                           9339.07 gross tons
6380 net tons                                                 6003.96 net tons
493 ft. length                                                  465 ft. length
60 ft. beam                                                     59.45 ft. beam
37 ft. depth                                                     38.5 ft. depth
29 ft. draught                                                  30.375 ft.
2 x triple expansion engines, twin screw      2 x quadruple expansion, twin screw
14 knots                                                          13.5 knots

mean draught 29 ft. 

This is the only comparative steamer with a draught approaching that of Waratah's, without reported problems.


SS Anchises



SS Assaye, built 1899, 7396 gross tons, 4484 net tons, length 450 ft. beam 54.25 ft., draught 26 ft. 2 in.

mean draught 26 ft. 2 in.


SS Assaye



SS Erinpura, 5128 gross tons, length 411 ft., beam 52.5 ft., draught 23 ft. 5 in

mean draught 23 ft. 5 in.


SS Erinpura




SS Devanha, built 1905, gross tons 8092, length 470 ft., beam 56 ft. 3 in., draught 27 ft. 8 in.

mean draught 27 ft. 8 in.





SS Sicilia, Barclay Curle & Co, built 1901, gross tonnage 6696, net tonnage 4174, length 450 ft., beam 52 ft. 4 in., draught 26 ft. 8 in.

mean draught 26 ft. 8 in.


SS Sicilia



HMHS Varela, gross tonnage 4645, net tonnage 1932, dead weight 5160 tons, length 390 ft., beam 53.3 ft., draught 22.9 ft.

mean draught 22.9 ft.




Let's revisit SS Indarra, a steamer which suffered similar problems to Waratah and had to be materially altered to reduce draught.

           SS INDARRA                                           SS WARATAH:

Engines:     twin quadruple                                     same

Launched:  1912                                                     1908

Gross tons: 9735                                                     9339.07

Length:       450 ft.                                                  465 ft.

Beam:         60 ft.                                                    59.45 ft.

Draught:      32 ft.                                                   30.375 ft.


mean draught 32 ft. takes the cake and prize. Her upper deck was removed during a major refit.

I could list many more examples but I believe the message is clear, Waratah should have had a similar draught to that of Geelong, 26.9 ft.. But this was not possible with her third superstructure deck. Captain Ilbery was quite right, she should have been materially altered:





SS Indarra



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