HMA 23 Airship

Type: Hydrogen-filled Rigid Airship
Role: Training Airship
Top speed: 52 mph / 84 kph
Volume: 942,000 ft3 / 26,700 m3
Length: 535' / 163.07 m
Diameter: 53' / 16.15 m
Engine Type: 4 250hp Rolls-Royce Engines
Manufacturer: Vickers, Beardmore, Armstrong-Whitworth
Number Manufactured: 4
Country of Origin: England
First Flight: September 19, 1917
Retired December, 1919