A startup developing low-cost, mass-producible next-generation hybrid rocket engines.  By using fuel such as plastic and storing the fuel and oxidizer separately, it achieves both high safety and a simple structure compared with conventional engines that rely on explosive propellants.  Leveraging proprietary fuel design, manufacturing and ignition technologies, Letara builds rocket engines—safe, affordable and high-thrust—that can "deliver anything, anywhere, within 24 hours."