 The duties were to include liaison, bombing (both day and night), dive bombing, torpedo bombing, and reconnaissance.As none of the competing prototypes ordered for the competition could carry out all of the roles, and as individually aircraft of the Hawker Hart series could perform most of these duties, with the Hart having excellent handling in a dive, Hawkers decided to base their entry on the Hind development of the Hart.They built the P.V.4 as a private venture ("i.e.