Nash & Thompson
Nash & Thompson was a British engineering firm that specialised in the production of hydraulically operated gun turrets for aircraft. The company was also an important manufacturer of hydraulic-powered radar scanners, used on radar systems such as H2S and AI Mark VIII.
Nash & Thompson was established in 1929 at Kingston upon Thames by business partners Archibald Frazer-Nash and E. Grattan Thompson and registered as a limited company in 1936. The company was formed to develop the turrets that Frazer-Nash had originated at his automotive firm, Frazer Nash, and the designs were consequently numbered in a series prefixed with "FN".
The company's major competition in the UK was from Boulton & Paul, which had licensed the designs of the French company S.A.M.M. (Societe d'Application des Machines Motrices). The FN turrets used hydraulic power produced by the aircraft's engine: the BP designs used individual hydraulic pumps for each turret supplied from the aircraft's 24 volt electrical system.
Nash & Thompson built a wide range of turrets for aircraft. All were powered hydraulically and carried 0.303 inch (7.7 mm) Vickers K or Browning machine guns, except where noted. Many were built by Parnall Aircraft which took over their patents, patent rights, designs and contracts in 1935.
- FN-1 – "lobster back" partially enclosed turret for Hawker Demon
- FN-4A – four gun rear turret
- FN-5 – two gun nose turret on Avro Manchester, Short Stirling and Vickers Wellington
- FN-5A – two gun nose turret on Avro Lancaster
- FN-7 – two gun dorsal turret on Blackburn Botha, Manchester, Short Sunderland, Stirling
- FN-9 – two gun retractable "dustbin" ventral turret on Wellington, rarely fitted.
- FN-10 – two gun tail turret on early-model Wellington and Armstrong Whitworth Whitley
- FN-11 – two gun retractable nose turret in Sunderland
- FN-13 – four gun tail turret in Sunderland
- FN-16 – single Vickers 'K' gun front turret in Whitley
- FN-17 – two gun retractable "dustbin" ventral turret on Whitley, rarely used
- FN-20 – four gun tail turret on Lancaster, Wellington, Stirling and Whitley
- FN-21A – two gun retractable "dustbin" ventral turret on Manchester, rarely used
- FN-25 – two-gun retractable "dustbin" ventral turret for the Wellington I based on the FN-17
- FN-50 – two gun dorsal turret ("Centre Gun Turret") on Lancaster, late-model Stirling
- FN-51 – two gun dorsal turret on early-model Handley Page Halifax
- FN-54 – two gun rearward firing chin turret on Bristol Blenheim Mk.IV and Bristol Beaufort
- FN-64 – two gun ventral turret ("Under Gun Turret") on Lancaster with periscopic sight, rarely fitted
- FN-77 – retractable ventral turret fitted with Leigh Light for the Wellington and Warwick based on the FN-25
- FN-82 – two gun (0.5 inch (12.7 mm) Browning) tail turret on late-model Lancaster
- FN-120 – four gun tail turret; refinement of the FN-20 weighing 40 lb (18 kg) less; used on late-model Lancaster and Wellington
- FN-121 – four gun tail turret on late-model Lancaster fitted with Village Inn gun-laying radar; also used without AGLR on Wellington and Warwick
- FN-150 – an improved two gun dorsal turret, based on the FN-50, and fitted to many Lancasters
- Esmonde Grattan Thompson died Roquebrune, Cap-Martin 19 January 1960, Managing Director of Parnall Aircraft. Obituary, The Times, Wednesday, Jan 20, 1960; pg. 15; Issue 54673
- Tarring, Trevor and Mark Joseland. Archie Frazer-Nash ... Engineer. London: The Frazer Nash Archives, 2011. ISBN 978-0-9570351-0-2.
- Gun turrets including FN types
- "Gun Turret Drills" on YouTube
- "Power-Operated Gun Turrets" a 1940 Flight article by A. Frazer-Nash