Bristol Type 6 T.T.A. and Type 7 F.3A

The T.T.A. (Twin Tractor Type A) was a local defence two-seat biplane, derived from the projected T.T. due to the non-availability of the R.A.F.4A powerplants. It was an unswept biplane with slight stagger, the wings having constant chord and carrying long ailerons on both planes. The wings were of three-bay construction, the inner interplane struts supporting the engines in rectangular nacelles midway between the wings. Twin-wheeled undercarriage units were mounted below each engine, with a tailskid and a noseskid to prevent nosing over. The large area tailplane was the same shape as that of the Scout D, with the same unbalanced elevators, but the finless rudder was balanced. The gunner sat in a cockpit in the nose of the aircraft, armed with two free-mounted 0.303 in Lewis Guns. The pilot, sitting behind the wing trailing edge, had a rear-pointing Lewis gun. Dual controls were fitted for emergency use. Two 120 hp Beardmore powerplants.

Type 6 T.T.A Specification
Span	Length	Height	Wing Area	Empty Wt	Max AUW	Cruise Speed	Maximum Speed	Range	Service Ceiling
53 ft 6 in	39 ft 2 in	12 ft 6 in	817 sq ft	3820 lb	5100 lb		87 mph/ 76 kn
16.31 m	11.94 m	3.81 m	75.9 m2	1733 kg	2313 kg		140 km/h

Three seat escort and anti-Zeppelin fighter. The F.3A utilised many of the TTA.'s components, including wings, tail unit and rear fuselage with pilot's cockpit. The landing gear was unorthodox and consisted of one T TA. chassis unit, suitably strengthened, under the fuselage with a small-wheeled outrigger under each wing-tip. Two gunners' nacelles were provided above the top wing, with a forward and a rearward gun in each, mounted on telescopic pillars swinging through 90 degrees to fire on the beam. Probably it was intended to install the Davis gun if this had developed satisfactorily.. One 250 hp Rolls-Royce powerplant.