[1] It had a cylindrical envelope constructed from goldbeater's skin without internal ballonets,[2] from which a long triangular-section framework of steel tubing was suspended by four silk bands.

It was powered by a 50 hp (37 kW) Antoinette engine driving a pair of two-bladed aluminium propellers via leather belts.

[1] On 10 October, still moored at Crystal Palace to avoid damage in high winds, she was buffeted so severely that some of the guy ropes tore free.

Following proposals for a new airship, it was decided to re-use the envelope of the first airship, which was enlarged to a capacity of 84,768 ft.[7][8] New features included a silk outer skin over the whole structure, a new and revised understructure, a small additional "reserve" gasbag in the space in between, modified control surfaces including a forward elevator, modified drive train from the old engine, and a ground spike.

[7] Nulli Secundus II was flown on 24 July 1908 in front of a crowd of several thousand people including General Horace Smith-Dorrien, Charles Rolls, and Frank Hedges Butler.