As a result of the experience gained in manufacturing aircraft under licence, Westland began to design and build its own aircraft, starting with the Westland N.1B in 1917, which was followed in 1918 by the Wagtail and the Weasel.
Завдяки набутому досвіду при будуванні літаків за ліцензією, Westland почали розробляти і будувати власні літаки, починаючи з Westland N.1B у 1917, за яким у 1918 з'явилися  Wagtail та Weasel.