INSIGHTS AD FLYING BOATS
On 12 and 15 March 1917 the first prototype AD Boat was trialled at Woolston with its new 200hp Hispano-Suiza, and a performance report compiled. On the surface the pilot found that the absence of a water rudder hindered control, while during take-off the aircraft exhibited severe fore-and-aft rocking, known as porpoising, accompanied by saturating heavy spray which reached its upper wing. However, in the air things improved: 1412 was sensitive on the controls as well as easily and quickly manoeuvrable. Top speed was measured at a brisk 98.5mph, while time to 10,000ft was 20 minutes 45 seconds and its ceiling 14,500ft.