About HRPG
Our Purpose
The Harvard Rocket Propulsion Group is a student-led organization building the Ivy League's first contemporary liquid bi-propellant rocket, the Mojave Sphinx. Our work stands on the shoulders of Half-Cat Rocketry while pushing onward into the future of student-led aerospace. Sponsored by sponsors, faculty, and a strong maker culture, HRPG turns theory into thrust and brings daring ideas to altitude.
Our Subteams
Propulsion
Propulsion
Propulsion
The Propulsion subteam is accountable for the design, integration, and testing of Mojave Sphinx's liquid bipropellant engine, including injector, combustion chamber, nozzle, and ignition system. Our focus lies in the maximization of thrust chamber performance using safe, trustworthy components like heatsink chambers, cartridge igniters, a
The Propulsion subteam is accountable for the design, integration, and testing of Mojave Sphinx's liquid bipropellant engine, including injector, combustion chamber, nozzle, and ignition system. Our focus lies in the maximization of thrust chamber performance using safe, trustworthy components like heatsink chambers, cartridge igniters, and scrintle injectors, all designed to provide repeatable ignition and optimum combustion of nitrous oxide and alcohol-fuel-based products. From machine work to static firings, we translate fuel and oxidizer into precisely controlled, measurable thrust.
Fluids
Propulsion
Propulsion
The Fluids subteam controls the entire propellant flow path—the tanks to the combustion chamber—through designing plumbing systems, actuation devices, and flow management techniques that energize the rocket. These components and techniques range from servo-actuated ball valves to stainless steel/PTFE feedlines, passive pressurization by d
The Fluids subteam controls the entire propellant flow path—the tanks to the combustion chamber—through designing plumbing systems, actuation devices, and flow management techniques that energize the rocket. These components and techniques range from servo-actuated ball valves to stainless steel/PTFE feedlines, passive pressurization by dual-acting vapor pressure, and proprietary quick disconnects. Our objective is to design resilient, low-complexity systems with minimal pressure loss, zero hazardous flow events, and reliable, safe delivery of fuel and oxidizer.
Data & Control
Data & Control
Data & Control
The Data & Control subgroup handles avionics, telemetry, and actuation for launch operations and in-flight data logging. We design the systems that send ignition and valve commands via remote RC control and log significant data like chamber pressure and valve position. While the rocket is passive following ignition, our subgroup offers pr
The Data & Control subgroup handles avionics, telemetry, and actuation for launch operations and in-flight data logging. We design the systems that send ignition and valve commands via remote RC control and log significant data like chamber pressure and valve position. While the rocket is passive following ignition, our subgroup offers precise pre-launch sequencing and robust ground-to-vehicle communication for safe and repeatable flights.
Structures
Data & Control
Data & Control
Structures leads the mechanical structure design and manufacturing of the rocket, including the airframe, thrust structure, fin assemblies, and integration hardware. With a modular, exoskeletal architecture, we ensure that all load-carrying components—from aluminum thrust brackets to bulkhead retention systems—are strong enough to resist
Structures leads the mechanical structure design and manufacturing of the rocket, including the airframe, thrust structure, fin assemblies, and integration hardware. With a modular, exoskeletal architecture, we ensure that all load-carrying components—from aluminum thrust brackets to bulkhead retention systems—are strong enough to resist internal pressure, axial loading, and launch loads. Our philosophy emphasizes accessibility, repairability, and alignment accuracy, making high-performance structure practical and field-serviceable.
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