SP-18 Onça

The SP-18 Onça (Brazilian-Portuguese name for the Jaguar) was a Brazilian single-seat, single engined experimental agricultural aircraft.[1]

SP-18 Onça
Role Experimental aircraft
National origin Brazil
Manufacturer Instituto de Pesquisas Tecnologicas
Designer Romeu Corsini
First flight 1965
Number built 1

Design and development

Developed by Brazilian engineer Romeu Corsini, it was designed to be an aircraft used in agriculture. It had STOL aircraft capabilities.[1]

The fuselage was made of welded steel tubes, externally covered in canvas, fixed landing gear, a "T" rudder to facilitate low-speed maneuvers, wooden, high-support wing.[2]

Flight testing went on for nearly a decade, and brought a number of improvements to the aircraft. The aircraft was eventually used for studies by aeronautical engineering students from São Carlos, under Corsini's supervision. It ended up influencing the construction of another aircraft, the IPAI-26 Tuca.[2]

Specifications

Data from Pereira 1986, p. 217

General characteristics

  • Crew: 1
  • Length: 7.50 m (24 ft 7 in)
  • Wingspan: 12 m (39 ft 4 in)
  • Height: 2.50 m (8 ft 2 in)
  • Wing area: 18 m2 (190 sq ft)
  • Gross weight: 900 kg (1,984 lb)
  • Propellers: 2-bladed

Performance

  • Stall speed: 68.5 km/h (42.6 mph, 37.0 kn)
  • Wing loading: 50 kg/m2 (10 lb/sq ft)

References
  1. Pereira, Roberto (1986). História da Construção Aeronáutica no Brasil 1910-1976. 1. São Paulo: Editora Aquarius. p. 215. ISBN 9788585262693.
  2. Pereira, Roberto (2013). Construção Aeronáutica no Brasil - 100 Anos de História. 1. São José dos Campos: JAC Editora. p. 361. ISBN 978-85-85262-69-3.
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