ERPL Hybrid rocket engine test fire. This is our second successful attempt at test firin' our experimental flight hybrid motor, t' Hydrus. Ya scallywag! It is an evolved version o' our previous engine, dubbed Hydra. This engine has a burn time o' about 5.6 seconds and has impulse within NARRRRR G. It uses HDPE as t' fuel and Nitrous Oxide as t' oxidizer.