Studienbüro für Spezialflugzeuge SB-5

Pilatus SB-5
	A model of the proposed Pilatus SB-5
Role	Civil utility aircraft
National origin	Switzerland
Design group	Studienbüro für Spezialflugzeuge
Designer	Belart
Developed from	Pilatus SB-2 Pelican

The Pilatus SB-5 was a study for a civil utility aircraft by the Studienbüro für Spezialflugzeuge at the ETH Zurich department of aircraft statics and aircraft construction.

Background

In November 1940, the design of the SB-2, designed by the same office, was proposed to its client the Swiss Federal Office of Civil Aviation which was at the time seeking a test aircraft to evaluate criteria for airfields in mountain valleys.^[1] Thus the desired aircraft would be a low-speed aircraft with STOL (Short Take-Off and Landing) performance, as well as very good climbing performance. It was not until May 1944, that the SB-2 first flew.

The SB-5 was a study for an enlarged version of the Pilatus SB-2,^[2]. According to the reports of the Studienbüro delivered to the Schweizerische Flugteschnische Vereinigung, whom the Studienbüro was subordinated, design commenced in the first quarter of 1944 and was last mentioned in the first quarter of 1945 as being terminated.^[3]

The Pilatus SB-5 was to be a single-engine high wing monoplane with a fixed nosewheel with a light-alloy semi-monocoque fuselage shell, accommodating 9 passengers in 3 rows of three, with an optional passenger in the co-pilots seat. Power was to have been supplied "possibly" by a Wright Cyclone^[4] driving a 3-bladed propeller.

Specification

Data from ^{[citation needed]}

General characteristics

Crew: 1-2
Capacity: 9-10
Wingspan: 22 m (72 ft 2 in)
Wing area: 55 m² (590 sq ft)
Max takeoff weight: 5,000 kg (11,023 lb)
Powerplant: 1 × Wright R-1820 Cyclone ("possibly" according to the only source) 9-cylinder air-cooled radial piston engine, 750–890 kW (1,000–1,200 hp)
Propellers: 3-bladed Escher-Wyss constant-speed reversible-pitch propeller (likely, but source fails to mention)

Performance

Maximum speed: 250 km/h (160 mph, 130 kn)

Pilatus "SB" projects

SB-1: Intended as a pure experimental aircraft, commercial use was not planned.
SB-2: The only SB project to be built and flown.
SB-5: An enlargement of the SB-2, abandoned before construction began.

(Nothing is known about any designs with the names SB-3 and SB-4).

References

^ Goss, page 13
^ Gross, Kuno (2019). Studienbüro für Spezialflugzeuge - Pilatus SB-2 Pelican Das Schweizer Bergflugzeug (in German) (1. Auflage ed.). BoD. ISBN 978-3-7494-3640-8.
^ Goss, page 139
^ Goss, page 138

External links

"Pilatus...Les Projets...Abandonnés". Pilatus-history-and-news (in French). Pilatus. 8 October 2010. Retrieved 26 March 2020.

[1] Goss, page 13

[Gross-2] Gross, Kuno (2019). Studienbüro für Spezialflugzeuge - Pilatus SB-2 Pelican Das Schweizer Bergflugzeug (in German) (1. Auflage ed.). BoD. ISBN 978-3-7494-3640-8.

[3] Goss, page 139

[4] Goss, page 138

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