Assertion: zeppelin | /r/CapableOf | make patrol flights
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text: As the German Navy changed from the P class of 1915 with a volume of over 31,000 m3 (1,100,000 cu ft) to the larger Q class of 1916, the R class of 1917, and finally the W class of 1918, at almost 62,000 m3 (2,200,000 cu ft) ground handling problems reduced the number of days the Zeppelins were able to make patrol flights.