02/28/2010. Remarks by Johan Visschedijk: "Designed by Frank Barnwell assisted by Leslie G. Frise, the T.T.A. (Twin Tractor Model A) was intended to meet a requirement for a two-seat twin-engined local defense fighter, the gunner in the nose having an unobstructed field of fire for two free-mounted 0.303 in (7.7 mm) Lewis guns.

Dual controls were fitted and the intended power plant comprised two 150 hp RAF 4a engines. In the event, non-availability of these engines resulted in the installation of two 120 hp six-cylinder Beardmore liquid-cooled engines in the two prototypes ordered, s/n 7750 and 7751, c/n 1375 and 1376.

The first T.T.A. was flown in April 1916, but displayed poor lateral control and was adversely criticized on the grounds of poor pilot view. As by this time synchronizing mechanisms for guns were becoming available, no further development of this category of aircraft was pursued."

Span: 53 ft 6 in (16.30 m)
Length: 39 ft 2 in (11.94 m)
Height: 12 ft 6 in (3.81 m)
Wing area: 817 sq.ft (75.9 sq.m)
Weight empty: 3,820 lb (1,733 kg)
Loaded weight: 5,100 lb (2,313 kg)
Max speed: 87 mph (140 kmh) at sea level
Climb: to 6,000 ft (1,830 m) 21 min