Successfully Test-Fired Engine Craft, Designed with Advanced Generation Techniques
In a significant leap for aerospace engineering, Leap 71 has successfully test-fired a generatively-designed, 3D printed aerospike engine. The groundbreaking event marks an important step for aerospike technology, which has been elusive for decades.
The engine, produced using a powder bed process in CuCrZr alloy, generated 5,000 Newtons (approximately 1,100 lbf) of thrust during its test fire, using liquid oxygen and kerosene fuel. The University of Sheffield’s Race 2 Space Team played a crucial role in the rocket's cleaning, heat treatment, and preparation.
The aerospike engine's unique design features an exhaust that is directed by a spike, a feature that helps manage heat and exhaust direction. This design is crucial for maintaining the engine components at a cool enough temperature to function effectively.
While the thrust produced by Leap 71's engine is significantly less than that of the VentureStar project's engines from the 1990s, it represents a promising and faster-evolving path towards efficient reusable launch vehicles. VentureStar's engines were projected to produce more than 1,917 kilonewtons (431,000 lbf) each, far more than Leap 71’s demonstrator engine.
Leap 71's rapid iterative development process, with new engine designs fired about every 30 days, including aerospikes, represents a modern, computationally accelerated approach compared to the longer timelines and costly physical prototyping of past single-stage-to-orbit (SSTO) projects like VentureStar.
The company has leveraged its proprietary AI-driven computational engineering platform, Noyron, to rapidly design high-performance rocket engines, including their XRB-2E6 model—a reusable methane/liquid oxygen engine generating 2,000 kilonewtons of thrust. This engine aligns with the performance level of leading U.S. launch systems and is part of a partnership with Aspire Space to build a large reusable launch vehicle capable of delivering up to 15 metric tons to low Earth orbit (LEO).
Aspire Space, originally Luxembourg-based, is relocating operations to the UAE to support national space ambitions, and LEAP 71 is central to their propulsion development efforts. Aspire’s goal is to debut the launcher around 2030, with Leap 71 aiming to begin test firing the second-stage engine by Q3 2026.
It's important to note that handling rockets, as they involve rocket science, requires careful adherence to safety guidelines. The original design process of the engine was reported on, but it hadn't been tested with fuel at the time.
In summary, Leap 71 has successfully demonstrated a 3D printed aerospike engine at a small scale and is rapidly advancing reusable rocket engines with AI-driven design, aiming eventually for meganewton-class thrust. While still far from the high-thrust, orbital-capable engines envisioned by SSTO projects like VentureStar in the 1990s, Leap 71’s approach represents a promising and faster-evolving path toward efficient reusable launch vehicles.
The successful test-firing of the 3D printed aerospike engine by Leap 71 is a significant step forward in the field of space-and-astronomy, demonstrating the potential of science and technology in propelling us towards new frontiers. The university's involvement in the engine's preparation underscores the collaborative nature of these advancements, bridging academic research and aerospace engineering.
