page_title: Delft Aerospace Rocket Engineering
section_title: Solid Propulsion
hierarchical_section_title: Delft Aerospace Rocket Engineering / Projects / Solid Propulsion
caption_attribution_description: English: Testing of the "Phoenix" hybrid rocket engine by DARE
context_page_description: Delft Aerospace Rocket Engineering is a student-run society within Delft University of Technology, with over 180 members. The main focus of the student group is the development of rocket technology on a non-profit basis. All development, from engines to electronics, is done in-house. Although several projects take place in DARE, the group's flagship is the Stratos project. This project included the Stratos I rocket which was launched in 2009 and set the European altitude record for amateur rocketry at 12.5 km. The follow-up of this rocket was the Stratos II+, which was launched on 16 October 2015, reaching an altitude of 21.5 km and breaking the European altitude record. In summer of 2018, Stratos III was launched, disintegrating 20 seconds after the launch. Its successor, Stratos IV, is currently in development. Even though DARE cooperates with the military to safely conduct launch campaigns, DARE's technology is strictly non-military.
context_section_description: Most rockets of DARE run on solid propellant engines, which are developed and built by the Solid Six team and the Safety Board. The propellants used is either a mixture of sorbitol and potassium nitrate, known as rocket candy, or a mixture of Ammonium Nitrate and Aluminium called Alan-7. The scale of the developed engines ranges from 300 N up to 7000 N.
caption: Testing of the "Phoenix" hybrid rocket engine by DARE
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