The largest and most powerful class are those known as the B
type, measuring about 240 feet in length by 40 feet maximum
diameter, of 223,000 cubic feet capacity, and fitted with two
motorsand two propellers. This vessel carries about 10
passengers, can climb to a maximum height of approximately 8,500
feet, and is capable of remaining in the air for twenty hours
upon a single fuel charge. While this is the largest and most
serviceable type of Parseval designed for military duties, there
is another, the A class, 200 feet in length with accommodation
for six passengers in addition to the crew of three, which is
capable of attaining a maximum altitude of 6,700 feet, and has an
endurance capacity of 15 hours. This class also is fitted with
twin propellers and motors. In addition there are the C and
E classes, carrying from four to eight passengers, while the
vedettes are represented by the D and F classes, which have a
maximum altitude of 2,000 feet and can remain aloft for only five
hours upon a single fuel charge. These smaller vessels, however,
have the advantage of requiring only one or two men to handle
them.
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