The Singapore III was the military production model of the Short Brothers "Singapore" flying boat. Initially developed and tested in 1926, several iterations of the plane were produced into the 1930s.
The Singapore III saw service with the RAF and Royal New Zealand Air Force during WWII, and was eventually retired by both nations in the early 1940s. Though never at the cutting edge of flying boat technology, the Singapore nonetheless proved a good if unremarkable addition to both fleets.
The Singapore III had a metal fuselage and fabric-covered metal wings, and was upgraded to four Rolls-Royce Kestrel engines. It had a range of a thousand nautical miles, and could reach speeds in excess of 130 knots.

This version features a fully functional cockpit and all normal flight controls, as well as a gyro that provides limited yaw control while taxiing.

Rotate at 80-85 knots, or set full throttle and max trim for auto takeoff.
Trim for level cruise at 90% throttle.
She glides about as well as a duck with one wing, so leave some throttle on and approach at around 70 knots.

Activate 1 for running lights
Activate 2 for turret (look to aim)
Activate 4-7 for individual engine shutdown (fire handles)

Turret code by @AntonWings
This build was inspired by a request from @StraitAircraft