A History of Engineering in 100 Objects: Model of the Napier Sabre V

IMechE | February 12, 2019

The Napier company began developing large aero-engines towards the end of World War One. The Lion, in modified form, had powered several of the Supermarine competitors in the Schneider Trophy air races and several land speed record cars. However, by the late 1920s, work had started on replacements. Two H-block designs, the H-16 Rapier and the H-24 Dagger, were produced. The H-block consisted of two horizontally opposed engines, lying one atop or beside another.
In 1927, Harry Ricardo published a study on the concept of the sleeve-valve engine. He argued that traditional poppet-valve engines would be unlikely to produce much more than 1,500hp; to pass this limit, a sleeve valve would have to be used, to increase volumetric efficiency. Ricardo started work with Bristol Engines on sleeve-valve designs and Major Frank Halford began work with Napier.

Spotlight

Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: Aeronautical engineering and Astronautical Engineering. Avionics engineering is similar, but deals with the electronics side of aerospace engineering.

Spotlight

Aerospace engineering is the primary field of engineering concerned with the development of aircraft and spacecraft. It has two major and overlapping branches: Aeronautical engineering and Astronautical Engineering. Avionics engineering is similar, but deals with the electronics side of aerospace engineering.

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