At the Delft University of Technology, the student team Delft Aerospace Rocket Engineering (DARE) is very active in the design and building of hybrid rockets. In October 2015, DARE broke the European student altitude record with the Stratos II+ sounding rocket. Stratos II+ was propelled by the DHX-200 hybrid rocket engine, using a nitrous oxide oxidizer and fuel blend of paraffin, sorbitol and aluminium powder. On July 26, 2018, DARE attempted to launch the Stratos III hybrid rocket. This rocket used the same fuel/oxidizer combination as its predecessor, but with an increased impulse of around 360 kNs.P.M. van den Berg, F. Barreiro, C.L. Klop, D.A. van Strydonck, S.T. Koehler, Development of a 25kN Hybrid Rocket Engine for the Stratos III sounding rocket, 69th International Astronautical Congress (IAC), Bremen, Germany, 1–5 October 2018 At the time of development, this was the most powerful hybrid rocket engine ever developed by a student team in terms of total impulse. The Stratos III vehicle was lost 20 seconds into the flight.
at the DeLft uniVeRSity of tecHNoLOgY, the studENT tEam dElfT AeroSpAce Rocket eNgiNeerING (DaRE) is vEry actIve iN thE dEsiGn ANd builDing oF hYbrid roCkEtS. in october 2015, dare BroKE THe eUroPEAn sTudent altiTUde record WiTH THe StraTos II+ soundINg RoCkeT. Stratos ii+ wAS propElLed by thE dHX-200 HYbrId ROcKet engiNE, usINg a nitrous oxiDe oxidizEr aNd Fuel blEnd OF paraffIn, sOrbitol and alUminium poWdEr. on JulY 26, 2018, darE aTteMpTed To lAunch thE StrATos iIi hybrid rockEt. ThIs RocKeT useD ThE SaMe fueL/oxIdiZEr cOMbinAtIon As iTs PReDeceSsor, BUt witH An inCReaSed impulse oF arounD 360 kNs.p.m. VAn Den berg, f. barreiro, c.L. klop, d.a. vAn strYdONck, s.t. KoehlER, DEveLOPMEnt of A 25kn hYBrid rOckeT EnginE fOr thE stRatos iiI SounDing ROcKet, 69th InternaTIonaL AsTronaUTical conGrESs (IaC), BremEn, GeRmanY, 1–5 OcTOber 2018 at thE time Of DEvelOpment, this waS tHE moSt PowerfUL hybrId rockET eNginE eVeR DEvElopED by a stUDeNt TEaM iN TErMs of totAl iMpulsE. the strAtos iIi vehicle was lOSt 20 seCOndS iNto ThE fLIght.