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NU-1B Otter

The NU-1B Otter is a single engine, tail dragger aircraft used to demonstrate fixed wing short takeoff and landing (STOL), flying qualities and performance. The aircraft is designed to carry one or two pilots and up to ten passengers, one of whom may act as a crew member.
The NU-1B Otter is used to train test pilots in low speed aircraft handling and flight characteristics. An all-metal, high-wing monoplane, the Otter is powered by a single P&W R-1340 radial engine driving a constant speed propeller. Dual rudder pedals and dual control wheels allow the aircraft to be flown from either the left or right flight compartment seat. It is the military version of the deHavilland DHC-3 used for many years by commercial industry for feeder operations, forest patrol, and light cargo transport.
The success with the DHC-2 Beaver persuaded de Havilland Canada, in the late 1940s, that there was room in the STOL utility market for a larger version of the Beaver, with cabin space for some 14 passengers or a freight load of up to 2,240 lbs. The company therefore developed the DHC-3 Otter. The prototype first flew on December 12, 1951, and the first deliveries of the airplane were made in 1952. The choice of a single engine for an aircraft designed to operate in Canada's harsh climate and sparsely populated hinterland regions may seem lacking in forethought, however, successful operations by the Beaver and other single-engine airplanes had confirmed that the well-proven radials of Pratt & Whitney design were more than adequate for the task; they were universally familiar and, more importantly, were extremely reliable. Like the Beaver, the Otter could operate on wheel, ski, float, or amphibious float landing gears.
Point Of Contact
Naval Air Systems Command
Public Affairs Department
47123 Buse Road
Unit IPT Bldg. 2272, Suite 075
Patuxent River, MD 20670-5440
(301) 757-1487
General Characteristics
Primary Function: Trainer and Utility
Contractor: deHavilland
Date Deployed: 1952
Propulsion: (1) 600hp Pratt & Whitney R-1340-S1H1-G
Length: 41 feet 10 inches
Height: 12 feet 5 inches
Wingspan: 58 feet
Weight: 4,900 pounds; Gross Weight is 8,000 pounds
Airspeed: 153 miles per hour
Ceiling: 18,000 feet
Range: Maximum: 875 miles with 2,100-lb. payload and reserves
Crew: One pilot
Armament: None
Last Update: 22 January 2019