Dimensions included a length of 25.3 feet, a wingspan of 29 feet and a height of 8.9 feet. Empty weight was 2,885lb against an MTOW of 3,750lb.
Fitted with a Power Jets (the company founded by Whittle) W1X turbojet, taxiing trials were had in April of 1941 and the aircraft went airborne for a short "hop" that month. Under tight security, the official first-flight was then recorded on May 15th, 1941 and proved the design, and its engine, wholly sound. In January of 1942, the airframe received the newer, more powerful Power Jets W1A which promised an output of 1,050lb and, in time, the aircraft was able to consistently reach speeds of 365 miles per hour. The second prototype carried the Rolls-Royce W2B turbojet (1,350lb thrust output) and this example was first-flown on March 1st, 1943 and managed speeds nearing 435 miles per hour.
For June of 1943, an even more powerful turbojet design outputting 1,520lb thrust was fitted and flown with success though, with the increase in performance, engineers had to overcome various speed-related obstacles inherent in high-speed flying so revisions to the airframe were made as needed; both pilots and engineers were to learn the nuances of high-speed flying as this advanced propulsion program evolved.
Before the end, the E.28/39 aircraft managed to record a top speed of 505 miles per hour and reach altitudes beyond 30,000 feet with seemingly relative ease. Testing continued into 1944 by which point the design had more or less completed its project goals and laid the framework for more advanced forms to follow. The first prototype ended its days as a museum piece at the Science Museum of London in 1946. The second prototype was lost during testing due to an aileron failure in flight.
While the E.28/39 was, at one point, seen as a true combat warplane end-product (pending the outcome of its test phase), it was never fitted with the proposed 4 x 7.7mm Browning machine gun battery originally envisioned.
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