The prototype Sea Bird on the ramp outside the Fleetwings seaplane factory. The FAA serial number is confirmed by the log book of pilot William H. Engle whose first flight in it was on 25 March 1937. That and all subsequent flights were recorded as on X16793. The skin is 0.010 thick stainless steel and it has been given a swirl finish to make it look attractive. The wing and empennage structures are also made from stainless steel with fabric covering. Engine is a Jacobs L-5 giving 285 hp. The three-section landing gear fairing disappeared from photos from 1938 on, however this aircraft was seen at Oshkosh 1992 with fairings, although possibly not originals. Texas based as N16793 in 2024. Photo from: Alan Reddig via Tim Martin

The first F-5 version which made its initial flight on 16 January 1938 with test pilot William H. Engle at the controls. The F-5 was a modified version of the F-4 with accommodation for five occupants (instead of four). Here it is parked on the Fleetwings seaplane ramp with both the nose mooring hatch and passenger access hatch open. Registration cancelled on 27 April 1948. Collection holder William Engle is the son of Fleetwings test pilot William H. Engle.

Registered CF-BGZ on 14 September 1937 ex NC16793 and here on the Fleetwings seaplane ramp prior to delivery. It was registered to Northern Ventures Ltd of Fort St James, BC initially. It was damaged in a landing accident on 7 March 1939 at Hamilton/ON and returned to the U.S. for repair in June 1939. Texas based as N16793 in 2024.