Variants
42 "C Class" Short Empire flying boats were built, including 31 S.23s, nine S.30s and two S.33s.
- S.23 Mk I : powered by four 920 hp (690 kW) Bristol Pegasus Xc poppet valve radial engines. 27 built.
- S.23 Mk II Bermuda : powered by four 920 horsepower (690 kW) Bristol Pegasus Xc poppet valve radial engines. 2 built.
- S.23 Mk III Atlantic : powered by four 920 hp (690 kW) Bristol Pegasus Xc poppet valve radial engines. two built.
- S.23M : two converted from impressed S.23 Mk I, with an ASV radar, armed with two Boulton Paul gun turrets and depth charges.
- S.30 Mk I : powered by four 890 hp (660 kW) Bristol Perseus XIIc sleeve valve radial engines. One built.
- S.30 Mk I (Cathay) : powered by four 920 hp (690 kW) Bristol Pegasus Xc poppet valve radial engines. One built.
- S.30 Mk II New Zealand : powered by four 890 hp (660 kW) Bristol Perseus XIIc sleeve valve radial engines. One built.
- S.30 Mk III Atlantic : powered by four 890 hp (660 kW) Bristol Perseus XIIc sleeve valve radial engines. Four built.
- S.30 Mk IV New Zealand : powered by four 890 hp (660 kW) Bristol Perseus XIIc sleeve valve radial engines. Two built.
- S.30M : two converted from impressed S.30 Mk III Atlantic for ASV trials and transport duties.
- S.33 : powered by four 920 hp (690 kW) Bristol Pegasus Xc poppet valve radial engines. Two completed, third example scrapped when 75% complete.
Many S.23, S.30 & S.33 were re-engined during the war with 1,010 hp (750 kW) Bristol Pegasus XXII poppet valve radial engines.
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