 The second Type 173 was designated Type 173 Mk 2 and allocated military serial "XH379", and had a revised landing gear, with castoring front wheels and fixed rear wheels.It was also fitted with small stub wings at the front and rear to improve the cruise speed, the stub wings being removed after a few flights when the helicopter was used for Naval trials, and a horizontal tailplane was added.As a result of the trials the Royal Navy showed an interest in ordering the type for carrier duties.