The "M-IV" completed in 1913 is the largest of this type, and
differs from its prototypes in that it carries two cars, each
fitted with motors, whereas the earlier machines were equipped
with a single gondola after the French pattern. This vessel
measures 320 feet in length, has a maximum diameter of 44 1/2
feet, displaces 13 tons, and is fitted with motors developing 450
horse-power, which is sufficient to give it a speed of 47 miles
per hour. This vessel represents a huge advance upon its
predecessors of this design, inasmuch as thelatter were about 245
feet in length by 36 1/4 feet in diameter, and displaced only six
tons, while the single car was provided with a motor developing
only 150 horse-power, the speed being 28 miles per hour. Thus it
will be seen that a huge development has suddenly taken place, a
result due no doubt to the co-operation of the well-known
engineer Basenach. The "M-IV" is essentially an experiment and
great secrecy has been maintained in regard to the trials which
have been carried out therewith, the authorities merely
vouchsafing the fact that the airship has proved completely
successful in every respect; conclusive testimony of this is
offered by the inclusion of the vessel in the active aerial fleet
of Germany.
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