Overall height 46' 0" 49' 0" 57' 6" 69' 3"
Hydrogen capacity
(cubic feet) 70,000 100,000 210,000 360,000
Gross lift (lb.) 4,900 7,000 14,500 24,300
Disposable
lift (lb.) 1,850 2,200 4,850 8,500
Crew 3 4 5 10
Lift available
for fuel and
freight (lb.) 1,370 1,540 4,050 6,900
Petrol consumption
at full speed
(lb. per hour) 3.6 7.2 18.4 29.8
Gals. per hour 0.36 0.72 2.05 3



CHAPTER VII
NAVAL AIRSHIPS.--THE RIGIDS
RIGID AIRSHIP No. 1

The responsibility for the development the Rigid airship having
been allotted to the Navy, with this object in view, in the years
1908 and 1909 a design was prepared by Messrs. Vickers Ltd., in
conjunction with certain naval officers, for a purely
experimental airship which should be as cheap as possible. The
ship was to be known as Naval Airship No. 1, and though popularly
called the Mayfly, this title was in no way official. In design
the following main objects were aimed at: