The type 97 I haven’t come across before but 92 precedes 97 so the type 92 must have been earlier. In fact it originated before WW II. There is nothing I can add to the details (and photograph) on this site:
http://www.jaapteeuwen.com/ww2aircraft/html%20pages/BOULTON%20PAUL%20P92%202.htmSo no need for me to repeat them here.
The type 92’s turret was fitted with a 40mm Vickers S cannon and installed in the prototype Wellington Mk II L4250. Later the gun was remounted in a larger, streamlined turret that caused the geodetic structure to flex. The fabric in the area of the turret was replaced with stressed-skin metal. The directional stability of the Wellington was affected by the turret so twin fins and rudders were fitted.
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The concept used in the Gannet, twin engines driving a contra-rotating propeller, also dated back before WW II. Fairey Battle K9370 was used to test their P.24 Monarch engine (2 coupled Prince P.12s). Four speed, two-stage supercharged and liquid-cooled it had independently controlled and synchronised counter-rotating and feathering co-axial propeller drives. K9370 made its maiden flight in June 1939.
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Details of the Monarch reached the US and they were interested in it as a potential power-plant for the P-47. As few Monarchs had been assembled, K9370, with its engine, was sent to the USA. The roundels were removed and stars painted on the wings and red and white stripes on the rudder.
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In 1943 it returned to the RAE. All work by Fairey’s powerplant department was ended by the Ministry of Aircraft Production in 1943 as they thought too much effort was being expended on too many engine designs within the industry. If the P.24 had ever given its proposed 2,240hp the Battle would have had a speed of 365mph!