Starting in January 1943, R8809 was used to test a new, clear, one piece sliding "bubble" canopy and its associated new windscreen structure which had slimmer frames which, together with the "cut-down" rear dorsal fairing, provided a far superior all-around field of view to the car-door type. From November 1943 all production aircraft, starting with JR333, were to be so fitted. However, the complex modifications required to the fuselage and a long lead time for new components to reach the production line meant that it took some time before the new canopy became standard. In order to have as many Typhoons of 2nd TAF fitted before "Operation Overlord" as possible, conversion kits were produced and used by Gloster, Hawker and Cunliffe-Owen to modify older Typhoons still fitted with the car-door canopy.Thomas 2009, pp. 10–11.
starting in january 1943 r8809 was used to test a new clear one piece sliding "bubble" canopy and its associated new windscreen structure which had slimmer frames which together with the "cut-down" rear dorsal fairing provided a far superior all-around field of view to the car-door type from november 1943 all production aircraft starting with jr333 were to be so fitted however the complex modifications required to the fuselage and a long lead time for new components to reach the production line meant that it took some time before the new canopy became standard in order to have as many typhoons of 2nd taf fitted before "operation overlord" as possible conversion kits were produced and used by gloster hawker and cunliffe-owen to modify older typhoons still fitted with the car-door canopythomas 2009 pp 10–11