Solar Cooking
Last edited: 7 June 2017      

The Hypar Solar Cooker - photo credit: William Bradley

The Hypar Solar Cooker is a parabolic solar cooker designed by William Bradley, founder of Earthbound Technology. According to the designer, it is a new type of solar cooker that is easier and less labor intensive to build than most parabolic cookers. The Hypar Cooker is primarily a multi-sided parabolic with the outermost portion of the parabola replaced with a conic section.

Bradley feels the Hypar cooker is safer than typical parabolic cookers because, with the multisided parabola, the focal point is spread over a focal area. Also, the focal area is located inside the Hypar cooker making it safer than cookers that have the focal point located outside the cooker.

Assembly of the pie shaped pieces to create the reflector

Earthbound Technology is making this solar cooker available to all interested persons wishing to make one for themselves. They offer construction instructions on their website.


Credit: Earthbound Technology

  • June 2017: Reciprocal optical testing - Earthboundtech conducted their reciprocal optical testing on the Hypar Solar Cooker and Parvati Solar Cooker in April 2017, and used comparative data from a CooKit analysis done in 2014. The Hyper solar cooker reflector utilizes a combination of a conical outer ring with a parabolic inner dish. This allows for more diffuse solar energy directed at the cookpot, while still having some concentration that a parabolic reflector can provide. More information on reciprocal optical testing procedures and results can be found on their website at

See also[]


See Earthbound Technology.