Definition
A small, storable liquid-propellant rocket engine used by SpaceX for the attitude control and maneuvering of the Dragon spacecraft.
Why It Matters
In the vacuum of space, your life depends on engines that must fire instantly every time, even after sitting cold for months. Draco thrusters matter because their hypergolic design eliminates the “moving parts” of traditional ignition, providing a level of reliability that spark-based systems cannot match. Without these high-precision, “infinite-restart” engines, the delicate ballet of docking with the ISS or the controlled descent for a safe splashdown would be far too risky to attempt.
Core Concepts
- Propellants: Uses hypergolic fuel (Monomethylhydrazine, MMH) and oxidizer (Nitrogen Tetroxide, NTO).
- Hypergolic Benefit: Spontaneously combust on contact, removing the need for an external igniter and allowing for infinite, rapid-fire restarts.
- Versatility: Designed to perform both long, steady burns (up to 25 minutes) and ultra-short pulses for precise proximity operations.
- Thrust: Produces 90 pounds of thrust (approx. 400 Newtons).
- Materials: Features a niobium alloy nozzle capable of withstanding extreme temperatures.