title: HW-4 Flamingo
text: # HW-4 Flamingo
  
  The HW-4 Flamingo, was a Brazilian two-seat in tandem-seat configuration, sailplane aircraft designed and manufactured for general flying.
  
  ## Design and development
  
  The Flamingo was built in Bauru in 1944, designed by Kurt Henrich and Hand Widmer, it resembled the high-performance German gliders of the time. When designing it, Widmer chose a profile with little penetration, but high elevation index. He made more than 40 drawings, and it was with these that the team started the work. Despite the great performance at low speed, it was not adequate to consider it a racing sailplane. The wings profile were strong cambered. Lighter than contemporary German DFS Weihe, though of similar general dimensions.
  
  ### Construction
  
  It was made largely of domestic wood; the outside was made with plywood and painted linho.
  
  ## Operational history
  
  It was based at the Aeroclube de Bauru while it was operational. He has won numerous Brazilian sailing championships, and several categories. It was retired for a structural reform in 2002 and continued flying until 2006. Its prefix was PT-PAY.
  
  ## Specifications
  
  Data from Pereira de Andrade 1986, p. 101, Simons 2006, p. 26
  
  General characteristics
  
  * Crew: 1
  * Length: 7.80 m (25 ft 7 in)
  * Wingspan: 18 m (59 ft 1 in)
  * Wing area: 18 $m^2$ (190 sq ft)
  * Aspect ratio: 18
  * Airfoil: Göttingen 539
  * Empty weight: 205 kg (452 lb)
  * Max takeoff weight: 330 kg (728 lb)
  
  Performance
  
  * Maximum speed: 220 km/h (140 mph, 120 kn)
  * Cruise speed: 104 km/h (64 mph, 56 kn)
  * Maximum glide ratio: 1:28
  * Rate of sink: 0.56 m/s (110 ft/min)
  * Wing loading: 18.4 $kg/m^2$ (3.8 lb/sq ft)
  