Here is a re-write of Part 4.01 to correct a big error on my part.
Part 4.01 The Butterflies start to hatch. Version 2
Morris industries pulling out of aero engine construction had ramifications. Sir Phillip was not to concerned, Lord Nuffield had been offered the hispano 12Y licence but had turned it down (fearful perhaps that it would be competing with the RR engines that were already established). To ease things Sir Phillip was instructed by the cabinet that Morris industries were to be given the contract for a large aircraft factory at castle Bromwich. Sir Phillip was absolutely determined that the big Castle Bromwich factory which was scheduled to build both bombers and Spitfires, would build the latter as a priority and the contract would have stringent milestones and serious penalties for any failure to meet them, the ultimate sanction being the removal of control of the factory back to the AM.
The first production Battles from Fairey’s factory were due in June 1937 with Austin owned factory at Coften Hacket entering production within a year.
By Easter Martlesham Heath was getting very busy, The Blackburn Skua had first flown in February and was now at Martlesham Heath, as was Fareys P4/34 after it’s first flight on January 14th.The Hawker Henley had not flown till the 10th of March but had joined the others after an accelerated test program.Sir Phillip was absolutely determined that the big Castle Bromwich factory which was scheduled to build both bombers and Spitfires, would build the latter as a priority and the contract would have stringent milestones and serious penalties for any failure to meet them, the ultimate sanction being the removal of control of the factory back to the AM.
These were all carrying out comparative trials along with one of the prototype battles and a Hurricane. The Vickers Vemon was also present to give comparative performance trails. The Miles Kestrel was due to fly in early May and would join the flight line as soon as possible. There was a steady stream of new prototypes due at Martlesham for the rest of the year. Amongst these was the DH Don, the first flight of which took place in June, Initial reports of the test flights were not favourable.
By The end of July AM Sir Charles Burnett as head of Training Command consulted with Sir Phillip on the Orders for Training aircraft that were now becoming critical. On advice from the AM for Research and Development Sir Charles was proposing to cancel the Don after the last protype. He was aware that an order for 250 had already been placed. His proposal was to order additional Airseed Oxfords which would be available by the end of the year and to write a specification for a Modified Miles Kestrel as an Advance trainer. Whilst a prototype to the new specification he was proposing an order for sufficient Kestrels to be build to provide conversion training of Squadron pilots for the new Hurricane due to enter service later in the year. Pilots would currently simply be shown the “Taps” and sent of solo in the Hurricane having previously only flown biplanes with fixed under carriage. The Kestrel would give the RAF a modern dual seat monoplane with flaps and retractable undercarriage with a performance not far below that of the hurricane. By the time freshly Trained pilots finished their ab initio training the New Miles Master trainer based on the Kestrel should be in service.
Also forming at Martlesham was a dedicated RDF development flight. This would originally made up of four Avro Ansons with other types being assigned as they became available. The boffins a Bawdsey manor were eager to get a couple of the new Battles or Blenhiems to give them a higher performance group of aircraft. This was especially to advance the work on ADF 1.5 and 2.
Initial reports from Follond at his new company British Marine Aircraft where that the design work on the new N1/37 fighter design was progressing very rapidly and work on two prototypes would commence by the end of the second quarter of 1937. As long as air worthy engines were available from Alivis and Bristols by the end of the third quarter then the first flight of both prototypes should be achieved before the new year.
Gloster’s were under pressure to get both their two F4/34 prototypes flying by mid-summer. For Bristol Mercury powered version was actually flying in May but the second prototype might have to wait for it’s Alvis, which although passing a 100 hour ground test had not yet flown. A Fairy battle was being pulled from the production line to use as a flying test bed but this was far from ideal. Gloster’s new Chief designer W.G. Carter was working on completing the design of the turreted night started by Folland to specification F34/35. With turreted fighter designs falling out of favour under Sir Phillips control of the AM, Glosters were informed that specification F34/35 would be superseded by another specification for a two seat day/night fighter with either twin Bristol Taurus or twin Alvis Pelides engines. Therefore the order for the prototype K8625 was transferred to the new aircraft. Operational Requirement OR49 and Specification F9/37 for a twin seat RDF equipped fighter armed with four 20mm cannons was issued to Gloster’s on June 1st 1937. Bristol Aircraft were sent a copy of OR.49 and requested to submit a design proposal.
after the Meeting in February when decisions such as RDF 1.5 had been made, that decision had ruffled some feathers and Sir Phillip suspected that he might have stirred up a problem for later, “Taffy” Bowen and his small team at Bawdsey Manor had made great strides. In that they had settled on a wave length of 6.5m for RDF1.5 and had refined the transmitter into a rotating aerial mounted on a low tower approximately equal in height to that of the white tower at Bawdsey.
At a meeting to discuss all the RDF developments at Bawday in May 1937 Rowe remarked that a 6.7meter wave length RDF unit would be able to detect an aircraft flying at 3000ft at a range of 80 miles if situated 120 ft above the horizon. Though RDF 1.5 was not limited by this horizon as the receiver in the aircraft would be above 120ft the range of the receiver was limited by the arial size on the aircraft and strength of the return from the target. Hence having a 360 degree radar to search for targets and the have a controller direct the RDF equipped fighter to within the detection range of the receiver on the aircraft was a vital part of the system.
Watson Watt further advised that the 6.7 Meter wave length was the shortest one proposed for use in the CH RDF system so that aircraft fitted with RDF1.5 could use RDF1 transmitters to hunt for targets offshore and RDF1,5 transmitters could provide warning of aircraft flying below the minimum detection height attained by CH stations though the 1.5 RDF units would need a horizon height of 120 feet if they were to achieve a detection range of 80 miles, the lower the transmitter height the lower the detection range for a ground based receiver.
It was at this meeting that Sir Hugh Dowding outlined to the gathered scientists his conception of a twin engine two seat cannon armed night fighter as being proposed via the AMRD in the soon to be issued OR.49 and invited comments or suggestions from the RDF scientists, particularly the articulate “Taffy” Bowen as the lead scientist in the RDF 1.5 and 2 team. Later after Sir Hugh had departed Sir Phillip spent a pleasant evening sitting on the lawn at Bawdsey watching the staff play cricket as the assembled scientists, technicians and engineers continued to discuss ideas and problems with him.