The book British Secret Projects: Fighters and Bombers 1935-1950 lists additional specifications for the Blackburn B.40:
Wingspan: 98 feet (29.9. meters)
Wing area: 1,400 square feet (130.2 square meters)
Weight: 52,500 lb (23,814 kg)
Max speed: 245 mph (394 km/h)
Ceiling: 5,000 feet (1,524 meters)