Nash & Thompson

Nash & Thompson was a British engineering firm that developed and produced hydraulically operated gun turrets for aircraft. As part of Parnall Aircraft it was also an important manufacturer of hydraulic-powered radar scanners used on radar systems such as H2S and AI Mark VIII.

History
Nash & Thompson was established in 1929 at Kingston upon Thames by business partners Archibald Goodman Frazer Nash and Esmonde Grattan Thompson

Nash & Thompson developed the hydraulic gun turrets that Frazer-Nash invented and his designs were consequently numbered in a series prefixed with "FN".

Parnall Aircraft
In May 1935 they formed Parnall Aircraft taking over George Parnall & Company and Hendy Aircraft Company. Thompson was appointed managing director and Frazer Nash technical director.

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.

Products
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 with which they merged 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 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