Jessie & James
J&J are LPL's workhorse engines and they are serving as a learning tools for the lab alongside with Hydra Test Stand. Modularity was a big consideration during design and for simplicity ablative cooling is used. Both engines can be tested at various conditions ranging from 500 - 1000 psi in the combustion chamber. Just was already successfully fired at 725 psi chamber pressure. Next step is to test James engine at various conditions to fully characterized the engine performance and then LPL will proceed to dual engine firing.