Napier Lion W-12 Engine

With an industrial history dating to the early nineteenth century, D. Napier and Son began building aircraft engines in the World War I era. Napier began work on a remarkable new engine, the Lion, in 1916. Its three banks of four cylinders formed a "W" or "Broad Arrow" configuration. The arrangement provided a much shorter crankcase, a stiffer and simpler crankshaft, and a more compact engine than the 12-cylinder "V" construction of other high-performance engines of the period. Napier produced the reliable and widely used Lion series from 1917 until 1932 for military, commercial, and special-purpose racing aircraft.

This early version of the Napier Lion is believed to be a Model II or IIB. Napier manufactured these models from 1918 through 1925 to power many British aircraft types, including the Handley Page H.P.15 V/1500 bomber, Supermarine Sea Lion I racer, and the Felixstowe F.5 flying boat.

Transferred from the U.S. Navy, Naval Supply Center, Cheatham Annex, Williamsburg, Virginia.

Physical Description:
Weight: 389 kg (858 lb)

Country of Origin
United Kingdom

Designer
A. J. Rowledge
Manufacturer
Napier Aero Engines Ltd.

Date
1918

Location
Steven F. Udvar-Hazy Center, Chantilly, VA
Hangar
Boeing Aviation Hangar

Type
PROPULSION-Reciprocating & Rotary

Dimensions
Length 125.7 cm (49.5 in.), Width 106.4 cm (41.9 in.), Height 91.4 cm (36.0 in.)

With an industrial history dating to the early nineteenth century, D. Napier and Son began building aircraft engines in the World War I era. Napier began work on a remarkable new engine, the Lion, in 1916. Its three banks of four cylinders formed a "W" or "Broad Arrow" configuration. The arrangement provided a much shorter crankcase, a stiffer and simpler crankshaft, and a more compact engine than the 12-cylinder "V" construction of other high-performance engines of the period. Napier produced the reliable and widely used Lion series from 1917 until 1932 for military, commercial, and special-purpose racing aircraft.

This early version of the Napier Lion is believed to be a Model II or IIB. Napier manufactured these models from 1918 through 1925 to power many British aircraft types, including the Handley Page H.P.15 V/1500 bomber, Supermarine Sea Lion I racer, and the Felixstowe F.5 flying boat.

Transferred from the U.S. Navy, Naval Supply Center, Cheatham Annex, Williamsburg, Virginia.

Physical Description:
Weight: 389 kg (858 lb)

Country of Origin
United Kingdom

Designer
A. J. Rowledge
Manufacturer
Napier Aero Engines Ltd.

Date
1918

Location
Steven F. Udvar-Hazy Center, Chantilly, VA
Hangar
Boeing Aviation Hangar

Type
PROPULSION-Reciprocating & Rotary

Dimensions
Length 125.7 cm (49.5 in.), Width 106.4 cm (41.9 in.), Height 91.4 cm (36.0 in.)

ID: A19731568000