| 11. | Once in service they proved to roll badly so bilge keels were later fitted
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| 12. | "Black Jack " is steel-hulled with wooden bilge keels.
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| 13. | Four bilge keels were fitted to improve stability.
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| 14. | On commercial shipping the bilge keel is the form of a draft of the vessel.
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| 15. | Her engines were overhauled, she had bilge keels installed, and two masts removed.
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| 16. | Originally designed as a family Dinghy and very stable thanks to it's bilge keels.
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| 17. | To minimise rolling there were, at Froude's suggestion, enormous twin bilge keels.
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| 18. | It has twin fixed bilge keels, and a simple sail plan of headsail and mainsail.
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| 19. | This convinced the navy that bilge keels were necessary and they were subsequently installed on all three ships.
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| 20. | The ships had a metacentric height of, and were equipped with bilge keels to increase their stability.
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