For the F7/30 Boulton Paul submitted its P.67.
From James Goulding’s Interceptor.
Although never built, the most unusual project submitted in the F7/30 competition was J.D. North’s twin engined design from Boulton Paul Ltd. Powered by two Napier Rapiers of 395hp the Boulton Paul P67 had a wing of constant chord using the Boulton Paul system of standard spar size and duralumin wing ribs. The wing was wire-braced to the fuselage and nacelles.
The armament was four 0.303” Vickers MkIII guns with 2,000 rounds was installed around the pilot’s cockpit, which was set well forward to give a good view, as required by the Specification. The two rapier engines, 16-cylinder H configuration in-lines, were mounted beneath the wings with the main undercarriage retracting backwards into the rear of the nacelles. The wingspan of the P67 was 40ft and the overall length was 29ft 4”, much the same as the Hawker Hurricane for comparison.
The P67 had an estimated top speed of 227mph at 12,500ft to which height it could climb in 6.55 minutes. It had a maximum rate of climb at ground level of 1,800ft/min, increasing to 1,960ft ft/min at 12,500ft, and falling off to 1,135ft/min at 20,000ft. It could climb to 20,000ft in 11.5min, at which height it could attain 217mph. Service ceiling was 30,000ft. The P67 could also land at less than 60mph.
The Boulton Paul proposal was not accepted.
Note it had a retractable undercarriage and the drawing in the book looks like it has it carrying a small bomb under the fuselage.
A good showing here could generate earlier interest in twin engined fighters.