Harold is a suborbital hopping vehicle for transporting small payloads around the lunar surface. It's able to travel much faster and farther than rovers, and can cover terrain that rovers can't. It uses propellants that can be extracted from lunar ice, which enables reusability and long-term sustainability.
Ronald is our 3D printed pressure-fed methalox engine that powers the Harold Lunar Hopper. It can generate 1,000 pounds of thrust at a specific impulse of 300 seconds, and the prototype engine has a thrust to weight ratio of 50. The combustion chamber and nozzle are regeneratively cooled with the liquid methane fuel.