The Douglas Cloudster II was an American prototype five-seat light aircraft of the late 1940s. It was of unusual layout, with two buried piston engines driving a single pusher propeller. Only a single example was built, which flew only twice, as it proved too expensive to be commercially viable.

Design and development

During the early 1940s, Douglas Aircraft Company developed a configuration for high-performance twin-engined aircraft, in which the engines were buried in the fuselage, driving propellers mounted behind a conventional tailplane, in order to reduce drag by eliminating drag inducing objects such as engines from the wing. This layout was first demonstrated in the Douglas XB-42 Mixmaster bomber, which first flew in 1944, showing a 30% reduction in drag compared with a conventional twin-engined layout, while eliminating handling problems due to asymmetric thrust when flying on one engine.Francillon 1979, pp. 372–377. Owing to the initial success of the XB-42, Douglas adopted this promising new layout for a medium-range airliner, the

DC-8 The Douglas DC-8 (sometimes McDonnell Douglas DC-8) is a long-range narrow-body airliner built by the American Douglas Aircraft Company. After losing the May 1954 US Air Force tanker competition to the Boeing KC-135, Douglas announced in Ju ...

Francillon 1979, pp. 714–715. and a five-seat light aircraft suitable for executive or

air charter Air charter is the business of renting an entire aircraft (i.e., chartering) as opposed to individual aircraft seats (i.e., purchasing a ticket through a traditional airline). Regulation Charter – also called air taxi or ad hoc – flights ...

use, the Model 1015 or Cloudster II."Tail-Pusher Plane Cruises 200 M.P.H."
''

Popular Mechanics ''Popular Mechanics'' (sometimes PM or PopMech) is a magazine of popular science and technology, featuring automotive, home, outdoor, electronics, science, do-it-yourself, and technology topics. Military topics, aviation and transportation o ...

'', March 1947, p. 103. The Cloudster II was a low-winged

monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple planes. A monoplane has inherently the highest efficiency and lowest drag of any wing con ...

with a retractable nosewheel undercarriage. The pilot and four passengers sat in an enclosed cabin well ahead of the unswept, laminar flow wing. Two air-cooled piston engines were buried in the rear fuselage, driving a single eight foot diameter twin-bladed propeller, mounted behind the

empennage The empennage ( or ), also known as the tail or tail assembly, is a structure at the rear of an aircraft that provides stability during flight, in a way similar to the feathers on an arrow.Crane, Dale: ''Dictionary of Aeronautical Terms, third e ...

via driveshafts taken from

P-39 The Bell P-39 Airacobra is a fighter produced by Bell Aircraft for the United States Army Air Forces during World War II. It was one of the principal American fighters in service when the United States entered combat. The P-39 was used by the ...

fighters. Two air intakes forward of the wing directed cooling air to the engines, which then exhausted beneath the fuselage."Douglas numeric, and A thru C."
''Aerofiles''. Retrieved: November 18, 2010.

Operational history

The Cloudster II made its maiden flight on March 12, 1947. Although the aircraft's performance and handling were good, it suffered from excessive vibration, and overheated when it was on the ground. Further development was abandoned late in 1947, with the prototype having flown only twice, as the post-war civil flying market had not developed as hoped, while the selling price had risen from an originally planned $30,000 to $68,000, rendering the aircraft commercially unviable.
''

Flight Flight or flying is the process by which an object moves through a space without contacting any planetary surface, either within an atmosphere (i.e. air flight or aviation) or through the vacuum of outer space (i.e. spaceflight). This can be a ...

'', August 28, 1947, p. 220.

Specifications

References

Notes

Citations

Bibliography

* Francillon, René J. ''McDonnell Douglas Aircraft since 1920''. London: Putnam, 1979. .

External links

{{commons category, Douglas Cloudster II
"5 Passenger Pusher", ''Popular Science'', 1947, p. 35

Photos - Aerofiles
Abandoned civil aircraft projects of the United States Cloudster II 1940s United States civil utility aircraft Twin-engined single-prop pusher aircraft Low-wing aircraft Aircraft first flown in 1947