From the MEWS photo archive this model of the  iconic De Havilland Gipsy I aero engine made by Tom Pasco to the Les Chenery design.  Tom machined everything from solid - no castings were used. The model is to 1:4 scale.

The de Havilland Gipsy is an air-cooled four-cylinder in-line engine designed by Frank Halford in 1927 initially as an upright 5-litre  engine, although later versions were designed to run inverted, with increased capacity and power.

The Gipsy was one of the most popular sport aircraft engines of the inter-war years and the engine of choice for various other light aircraft, trainers, liaison aircraft and air taxis. It continued well after the end of  World War II and established the company as an engine as well as aircraft manufacturer.

Gipsy engines are still in service in vintage light aircraft.