The Star was introduced in April 1926 and was claimed to be “a wonderful achievement of modern methods of production in large quantities.” All tolerances were very tight, for this type of engine, moving parts made to the smallest dimensions consistent with required strength and it had generous bearing surfaces.

This engine was of a completely new design and had two longitudinal cylinders each of 0.6250” bore and 0.6250” stroke. It was constructed of two aluminium castings, one for the combined cylinder block and crankcase and a base plate with four integral mounting lugs. It had pressed in cylinder liners of hard brass. A 1.25” diameter 0.375” thick steel disc wheel was provided as standard. 

This engine introduced a number of new features for Stuart engines. 

The usual slide valve gear was replaced by a very close tolerance (0.0005”) rustless steel piston valve contained in a gunmetal, single casting, combined valve chest/cylinder head. 

The valve gear is driven by two bevel gears enclosed within the cylinder/crankcase casting. The piston valve was driven by a pressed steel eccentric banjo connection which fitted around the valve chest. Both these features went on to become standard on the Sun (Piston and Slide Valve variants) and the Sirius.  

The Star was never made available as castings and materials – it was only available as a complete, ready to run, engine with a displacement lubricator as standard. Although a comprehensive range of interchangeable spare parts were available – and guaranteed to fit.

The design is slightly larger and heavier than the No 1a The Featherweight being 4.75” long, 2.75” wide, 3.75” tall with a weight of 18 oz. It was intended for use in one metre boats such as the Stuart ISIS and was usually combined a Stuart No 495 boiler. 

The engine was thoroughly tested by Stuarts who claimed it simply refused to show any signs of wear. Stuarts went into war work in 1939. Sadly, the Star never reappeared in the catalogues after the war

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