E.K.Cole Southend-on-Sea & Malmesbury 1939-71

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The worlds first Airborne Radar assisted night interception

Chris Poole 2007

In order to train both the RAF aircrew, maintenance crews and the radar interception stations (the CH stations), a special unit called 'the Fighter Interception Unit' was formed at RAF Tangmere in April 1940 under the command of Squadron Leader Peter Chamberlain equipped with 5 Blenheims having A.I.Mark III, which was the latest variant of Airborne radar.

Blenheim IV
Photograph of preserved Blenheim IV in Night-fighter colour scheme and with gun pod visible under belly
In June 1940 AI equipped Blenheims were designated Mark 1F

Photograph reproduced courtesy of Ian Kirby

Flying consisted of daytime practice interceptions and operational flights by night and while there were many times when the Blenheims were directed to possible targets it was proving difficult to acquire and maintain a solid contact and intercept.

This was to change dramatically on the night of the 22nd/23rd July 1940 when a Blenheim piloted by Flight Officer 'Tubby' Ashfield together with Pilot Officer C Morris (Observer) and Sergeant R.A. Leyland who was the A.I. Operator, took off at about 11.00pm for a patrol along the Sussex coast at 10,000 feet.

Shortly after getting to altitude they were directed to a possible intercept by the controller at 'Poling CH station' who reported an incoming raid (designated raid 9) at 6,000 feet. This night the controller was able give them good information and despite several course changes by the raid, was able to direct them to a point about 10 miles south of Selsey Bill.

Shortly after 11.30pm Sgt. Leyland reported that he had a response on the A.I. at a range of 8,000 feet and after flying an interception course, P/O Morris made a visual sighting of an aircraft to port and just below the Blenheim. After manoeuvring the Blenheim to place the them in a position where the enemy aircraft was silhouetted against the moonlight, it was ascertained that it was a German Dornier 17.

Dornier DO17Z
Wartime photograph of Dornier DO17Z from the Ron Dupas collection - reference APS photograph 257

Once it was identified, Tubby Ashfield accelerated and closed the distance until he was about 400 feet and then opened fire.

To use the words of Tubby Ashfield 'it was like a huge firework display' and strikes were observed on both the fuselage and engines. Tubby continued to fire his guns until he had closed to within 200 feet when the Dornier lurched to starboard and fell away.

Tubby attempted to follow, still firing but by this time the cockpit Perspex windows were covered in oil from the enemy A/C resulting in Tubby losing control of the Blenheim and diving inverted towards the sea. It was only at 700 feet altitude that Tubby managed to recover the aircraft by which time contact had been well and truly lost.

Calling Poling CH station for a vector home, they crossed the English coast between Bognor Regis and Littlehampton whereupon P/O Morris reported seeing a glow in the sky some distance behind them and slightly to port. As he watched he saw an object crash into the sea and continue to blaze for some time. He estimated that this would have been about 5 miles south of Bognor Regis.

A pilot of 43 Squadron who was also on patrol in the area provided independent conformation of the blaze and position.

Tubby Ashfield landed the Blenheim safely back at Tangmere at about 00.15am little realizing that he and A.I. radar had changed forever how aerial warfare would be raged in the years to come.

Note: Later the aircraft was identified as a Dornier 17Z of 2/KG3 when Lt. Kahlfuss and 3 NCOs were rescued from the sea.

WW2 Radar








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