 When smooth conditions were regained at about 8,000 ft altitude the test vehicle A1 carrying all the prototype examples of instruments and equipment was found to have parted from the aircraft and disappeared beneath the waters of the Bristol Channel.List of Test Vehicles in Chronological Order 
Ref.Type Details 
A1 Complete Lost in cloud during early flight trials—30/05/47 
A2 Complete First release—rocket motor failed to ignite—08/10/47 
A9 Fuselage Rocket motor starting tests.