title: DSK Duster
text: # DSK Duster
  
  The BJ-1 Dyna Mite, or California Sailplanes Duster was a sailplane designed by Ben Jansson in the United States in the 1960s for homebuilding.
  
  ## Design and development
  
  A conventional shoulder-wing design with conventional empennage, no component of the BJ-1 exceeds 18 ft (5.5 m) in length, in order to facilitate building and storage in a domestic garage. Construction throughout was of wood, apart from a few mouldings (like the nosecone) made of fiberglass. The BJ-1 Dyna Mite first flew in 1966.
  
  The rough building sketches from Ben Janssons prototype design from 1963, were refined by Hank Thor and the BJ-1B Duster plans were released in 1971 featuring a lighter weight, extended wingspan and a lower canopy that required the pilot to fly it semi-reclined. By 1977, more than 200 sets of plans had been sold. In total 371 sets of plans were sold and DSK (Duster Sailplane Kits) sold about 169 kits.
  
  ## Aircraft on display
  
  * US Southwest Soaring Museum - prototype
  
  ## Specifications (BJ-1B)
  
  General characteristics
  
  * Crew: One pilot
  * Length: 20 ft 6 in (6.0 m)
  * Wingspan: 42 ft 8 in (13.00 m)
  * Wing area: 103 sq ft (9.6 $m^2)$
  * Aspect ratio: 17.7
  * Empty weight: 350 lb (159 kg)
  * Gross weight: 580 lb (281 kg)
  
  Performance
  
  * Maximum speed: 128 mph (206 km/h, 111 kn)
  * Maximum glide ratio: 29
  * Rate of sink: 148 ft/min (0.76 m/s)
  