Hawker P1072 VP401 ground Bitteswell
The sole P.1072 at Bitteswell around the time of its first flight using rocket power.
The Hawker Siddeley P.1072 was an experimental aircraft which acted as a test bed for the development of rocket assisted take-off technology. The idea to fit a rocket motor to the Hawker P.1040 (which would become the Sea Hawk naval jet fighter) was raised as early as October 1945, despite there being no such suitable powerplant nor a physical prototype of the Hawker P.1040 in existence.
By 1947 however, British engine manufacturer Armstrong Siddeley had begun work on a rocket motor using a mixture of liquid-oxygen and water-methanol as its propellant, although its first test runs was not until the end of March 1950.
The idea of a mixed-power Hawker P.1040 was revived using the prototype (VP401) which had completed its development work to the N.7/46 Specification for a high-speed naval jet fighter. The redundant prototype was therefore returned to the Hawker factory at Kingston for modification, to become the sole P.1072.
The P.1040’s original, single Rolls-Royce Nene turbojet installation would remain largely the same , albeit with air intakes in stub wings exhausting through bifurcated ducts, aft of the wing trailing edge.
Hawker P1072 Snarler rocket ground running
The Snarler rocket motor fitted to VP401 during ground-running trials.
The rocket motor, named 'Snarler', was installed in the extreme tail of the fuselage, directly beneath the rudder. The fuel system for both powerplants was revised and modified with a spherical 75 gallon liquid-oxygen tank in the forward fuselage, with a 120 gallon water-methanol tank in the rear fuselage. Fuel for the Nene engine was carried within the forward fuselage, the fuselage saddle and rear fuselage tanks.
By June 1950, the Snarler was ready to be fitted in the revised fuselage and it was transported to Kingston.
The aircraft flew to the Armstrong Whitworth airfield at Bitteswell, under Nene power only, on 16th November 1950. On the 20th November, the Snarler was tested in flight, in combination with the Nene engine.
Six further test flights were made with the P.1072, including the final one during which an explosion in the Snarler caused minor damage. 
However by early 1951, the Air Ministry had turned its attention to reheated turbojets instead and the P.1072 never flew again.
Hawker P1072 take off under mixed power
VP401 takes off from Bitteswell using both jet and rocket power.

Number built & Variants

One only (VP401) modified from P.1040 prototype.



Powerplant                One 5,000lb-thrust Rolls-Royce Nene RN.2 turbojet engine plus one 2,000lb-thrust Armstrong Siddeley Snarler liquid-fuel rocket motor
Span 36ft 6in
Maximum weight 14,050lb
Capacity Single pilot
Maximum speed 581 mph at sea level; Mach 0·82 at altitude in level flight
Endurance 45min for test sortie; rocket power 2min 45sec





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