Short Brothers began in 1925 the design of a Cirrus-engined two-seat twin-float monoplane, using the familiar duraluminum monocoque fuselage construction already proved on the Cockle, Satellite and Springbok. This design (index No. S.7) was named the Mussel after the club-house near Short Brothers' first aeroplane factory on Sheppey in 1909.
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