The Acme S-1 Sierra was an experimental aircraft of unusual configuration built in the US in 1948 to investigate the advantages of a pusher propeller configuration. Apart from this engine installation, the aircraft was unusual in having an X-shaped tail incorporating ruddervators on the upper fins. The wing was mounted midway up the fuselage and was unswept. During the 1960s, Northrop used the aircraft as a technology demonstrator for boundary layer control concepts.

Specifications (S-1 Sierra)

General characteristics

• Crew: one pilot
• Length: 18 ft 0 in (5.49 m)
• Wingspan: 20 ft 2 in (6.15 m)
• Height: ft in ( m)
• Wing area: ft² ( m²)
• Empty: 590 lb (268 kg)
• Loaded: lb ( kg)
• Maximum takeoff: lb ( kg)
• Powerplant: 1x Continental C-85, 85 hp (63 kW)

Performance

• Maximum speed: 200 mph (320 km/h)
• Range: miles ( km)
• Service ceiling: ft ( m)
• Rate of climb: ft/min ( m/min)
• Wing loading:
• Power/Mass:

Related content

Comparable aircraft: Göppingen Gö 9

Designation sequence:

U.S. experimental aircraft 1940-1949