ROFL liquid engine static fire

This was ROFL (rocket of our fearless leader), our kerosene/nitrous-oxide liquid engine with the goal of creating a blown down engine that uses the oxidizer to pressurize the fuel. Self-pressurized engines are common (such as LOX/methane varieties) but using the fuel/oxidizer to pressurize the other is less common. You may see names such as positive expulsion devices or VaPak propulsion systems

Unfortunately this engine hard started (over pressurization of the combustion chamber) during our static hot fire, and as you can see the nozzle and everything below the combustion chamber blew out.