Alternatively, the Dart could carry beneath its wings an equivalent load of bombs, the largest acceptable single missile being of 520 lb (236 kg). The 450 hp Napier Lion IIB or Lion V twelve-cylinder liquid-cooled W-engine was used to power the Dart, giving it a top speed at sea level of 110 mph (177 kmh). Specification 9/21 for a torpedo landplane was cancelled later and superseded by Specification 32/22, to which the Dart was produced for the FAA.
The Dart was eminently well suited for its purpose and was of particular use in providing the FAA with a reliable torpedo-carrier with which to gain plenty of basic experience in the art of launching. The first of 108 production Darts were delivered in 1923, the type subsequently remaining in service for the ensuing ten years, allotted serials were:"
N9536 to N9561
N9620 to N9629
N9687 to N9696
N9714 to N9723
N9792 to N9823
N9990 to N9999
S1115 to S1120
S1129 to S1138