Tri-Turbo-Three at Farnborough Airshow in 1978.
Role Transport aircraft
Manufacturer Conroy Aircraft
First flight 2 November 1977
Status Retired
Primary users Polair
Maritime Patrol and Rescue
Number built 2
Developed from Conroy Turbo-Three

The Conroy Tri-Turbo-Three was a Douglas DC-3 fitted with three Pratt & Whitney Canada PT6A turboprop engines by Conroy Aircraft; the third engine was mounted on the nose of the aircraft.

Design and development

First flown on 2 November 1977,[1] the cruise speed of the aircraft was increased to 230 mph (200 kn; 370 km/h). The engine mounted on the nose could be shut off, decreasing the speed to 180 mph (160 kn; 290 km/h) and increasing the range of the aircraft. It was used by Polair and Maritime Patrol and Rescue.[citation needed] It was fitted with skis for use in polar regions and flew in the North Pole region out of Resolute Bay Airport in Canada. It was uniquely suited for flying long distances and landing on rough, unprepared snow runways.

In this role it was instrumental in opening up the interior of Antarctica to private expeditions and tourism.[1] Most notable was a 1983 expedition transporting eight members of the Seven Summits expedition, plus a crew of three, to the Antarctic for a first-ever assault on Mount Vinson.[2]

In early May 1986 workers at the Santa Barbara Municipal Airport accidentally started a fire in the cockpit of this aircraft, which destroyed the cockpit. A second Tri-Turbo-Three was then manufactured out of the wreckage of the old plane and a different airframe.[citation needed]


Data from The Illustrated Encyclopedia of Propeller Airliners[3]

General characteristics


See also

Related development

Aircraft of comparable role, configuration, and era

Related lists


  1. ^ a b Air International November 1978, p. 252.
  2. ^ Bass, Dick; Wells, Frank (1986). Seven Summits. Warner Books, Inc.
  3. ^ Gunston 1980, p. 256.
  4. ^ "15-bladed DC-3". Flight International, 23 September 1978, p. 1155.