Meanwhile, the Royal Naval Air Service (RNAS) began actively experimenting with this possibility. The first successful aerial torpedo drop was unofficially performed by the later RFC pilot Charles Gordon Bell on 27 July 1914 - dropping a Whitehead torpedo from a Short S.64 seaplane. Gordon Bell was followed the next day by RNAS pilot Arthur Longmore, when officially testing an aerial torpedo. The success of these experiments led to the construction of the first purpose-built operational torpedo aircraft, the Short Type 184, built from 1915.