ERPL Hybrid rocket engine test fire. This is our second successful attempt at test firing our experimental flight hybrid motor, the Hydrus. It is an evolved version of our previous engine, dubbed Hydra. This engine has a burn time of about 5.6 seconds and has impulse within NAR G. It uses HDPE as the fuel and Nitrous Oxide as the oxidizer. Music: http://www.youtube.com/watch?v=XANo-bsKYHE