Despite these inherent risks, the very high freeboard raises the seaworthiness of these vessels. Sea trials are conducted to measure a vessel's performance and general seaworthiness. Deficiencies in seaworthiness in turn reduced the battle-worthiness of the fleet. These vessels had strong artillery and thick armor, but lacked seaworthiness, speed and long-distance abilities. The museum also undertakes research in experimental archaeology centred on Viking shipbuilding and seaworthiness. The ship carried a Greek certificate of seaworthiness. The Westsail 32 is a heavy-displacement sailboat designed for ultimate seaworthiness. This gave oarsmen enough leverage to row efficiently, but at the expense of seaworthiness. The limitations in speed and seaworthiness were a trade-off for the heavy armament carried. They furthermore pointed out the poor morale and reduced seaworthiness of the Persian fleet. Trollope was extremely happy with "Glatton"s seaworthiness, handling and general fitting out. The Type 7 destroyers proved to have a less than adequate seaworthiness for Soviet conditions. The casemates were plated over to improve their seaworthiness. Reed maintained the features were all intended to improve seaworthiness. It is a fundamental question of seaworthiness.