21. Their lighter than expected weight caused them to roll excessively, which necessitated the fitting of deep bilge keels . 22. USS " Oregon " in drydock in 1898, showing her starboard bilge keel and pudgy underwater shape 23. Ratnik noticed that the bilge keels added by the NTC did not fit into existing drydocks of his yard. 24. In the winter of 1897 1898 she was put in drydock where bilge keels were installed to improve her stability. 25. In early 2002, the first four ships found to have microscopic cracks in the bilge keel and hull plating. 26. Another aspect aiding in its confined manoeuvrability would be the bilge keels which aid in protecting its twin drive props. 27. There were two bilge keel designs, the earlier design being a pair of essentially square, cast steel plates. 28. She rolled badly until fitted with bilge keels . " Portland " was designed for a range of at. 29. In early 2002, microscopic cracks in " Te Mana " s bilge keel and hull plating were discovered. 30. In a major alteration, two bilge keels were added to each side in an effort to lessen her tendency to roll.
