>>1150196>Lard used as a Fuel for Hybrid Rocket MotorsThis sounds hilarious, like they what really built was a propane-powered lard cannon.
>Problems included instrumentation, mechanical failures, and combustion instability.>Also, the lard fuel must stay in a frozen state at the time of the rocket firing, or the grain collapses and large chunks are blown out.>The cause for the difference [between predicted and observed results] remains uncertain but it is believed to result, at least in part, from spallation of the fuel and the ejection of unburned fuel particles from the engine. 