DSK Duster

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BJ-1 Dynamite/ BJ-1B Duster
Role Sailplane
Manufacturer Homebuilt
Designer Ben Jansson and H. Einar Thor
First flight August 1966
Number built 70+

The BJ-1 Dyna Mite, or California Sailplanes Duster[1] was a sailplane designed by Ben Jansson in the United States in the 1960s for homebuilding.

Design and development[edit]

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.


BJ-1 'Dyna Mite'
BJ-1B 'Duster'

Aircraft on display[edit]

Specifications (BJ-1B)[edit]

General characteristics

  • Crew: One pilot
  • Length: 20 ft 6 in (6.0 m)
  • Wingspan: 42 ft 8 in (13.00 m)
  • Wing area: 103 ft2 (9.6 m2)
  • Aspect ratio: 17.7
  • Empty weight: 350 lb (159 kg)
  • Gross weight: 580 lb (281 kg)


  • Maximum speed: 128 mph (206 km/h)
  • Maximum glide ratio: 29
  • Rate of sink: 148 ft/min (0.76 m/s)


  1. ^ Air Trails: 84. Summer 1971.  Missing or empty |title= (help)
  2. ^ US Southwest Soaring Museum (2010). "Sailplanes, Hang Gliders & Motor Gliders". Retrieved 26 May 2011. 
  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 347. 
  • Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allan. p. 30. 
  • Coates, Andrew (1978). Jane's World Sailplanes and Motor Gliders. London: MacDonald and Jane's. p. 167. 
  • Simons, Martin (2004). Sailplanes 1965-2000. EQIP Werbung & Verlag GmbH (2004). 
  • Thor, Hank (1971). Building the BJ-1B Duster Plans Number 168. editions. 

External links[edit]