Key Takeaways
- Renishaw’s additive manufacturing (AM) technology enabled rapid, cost‑effective production of a hypersonic propulsion system for Velontra.
- Innovative 3D Manufacturing used Renishaw’s RenAM 500Q multi‑laser metal PBF‑LB machine to iterate parts overnight, dramatically shortening development cycles.
- The Bronco hypersonic engine achieved thrust exceeding Mach 5 in Purdue University wind‑tunnel tests, positioning it as a first‑of‑its‑kind system.
- Collaboration highlighted the importance of design‑for‑AM expertise, material selection (Inconel, titanium, aluminium), and automated powder handling for consistent quality.
- Velontra plans to integrate the Bronco into supersonic vehicles and develop an unmanned spaceplane for satellite launches, leveraging continued AM‑driven innovation.
Overview
Renishaw, a UK‑based leader in additive manufacturing, recently showcased how its AM technology helped Velontra, a Cincinnati‑based start‑up, develop a low‑cost hypersonic propulsion system. The case study highlights the partnership between Velontra, Innovative 3D Manufacturing (a rapid‑prototyping firm in Franklin, Indiana), and Renishaw’s hardware. By employing metal‑based laser powder‑bed fusion, the collaborators were able to produce complex, lightweight components quickly, meet stringent aerospace tolerances, and keep production expenses within budget. This synergy demonstrates how AM can accelerate innovation in high‑performance aerospace applications while reducing material waste and lead times.
Collaboration Initiation
Velontra’s CTO, Joel Darin, emphasized that speed is essential in the competitive hypersonic market, citing the Wright brothers’ iterative testing philosophy as a model for their own development approach. Although the team recognized the advantages of additive manufacturing for rapid prototyping, they lacked in‑house AM expertise to establish a reliable process within their tight timeline. Consequently, Velontra reached out to Innovative 3D Manufacturing, which had recently expanded its facility and installed multiple Renishaw RenAM 500Q multi‑laser AM machines. This outsourcing strategy allowed Velontra to focus on design and performance while leveraging the partner’s manufacturing capabilities.
Role of Innovative 3D Manufacturing
Innovative 3D Manufacturing acted as Velontra’s manufacturing extension, providing not only machine time but also AM design guidance. Operations manager and owner Chris Beck explained that the team helped Velontra understand critical aspects such as designing geometries suited for laser powder‑bed fusion, selecting optimal wall thicknesses, and choosing appropriate aerospace‑grade alloys. By mentoring Velontra’s engineers on these DFM (design for manufacturing) principles, Innovative 3D Manufacturing ensured that the parts could be printed successfully on the first attempt, reducing costly redesigns and material waste.
RenAM 500Q Capabilities
The core of the production workflow was the Renishaw RenAM 500Q, a laser‑beam powder‑bed fusion (PBF‑LB) system equipped with four 500 W lasers that can simultaneously scan the entire build plate. This configuration maximizes productivity by allowing multiple parts—or multiple iterations of a single part—to be fabricated in a single build cycle. The machine also incorporates automated powder delivery, sieving, and waste‑handling subsystems, which maintain consistent powder quality, minimize operator intervention, and enhance safety. These features proved essential for Velontra’s need to receive functional prototypes within 24 hours of sending a design file.
Material Selection and Part Performance
Using the RenAM 500Q, Innovative 3D Manufacturing processed a range of aerospace‑grade metals, including Inconel, titanium, and aluminium alloys. These materials provide the high temperature resistance, strength‑to‑weight ratio, and corrosion resistance required for hypersonic propulsion components. By optimizing part thickness and internal lattice structures, the team achieved lightweight yet robust parts that could withstand the extreme thermal and mechanical loads experienced during Mach 5+ flight. The ability to switch materials quickly on the same machine further accelerated the iteration process.
From Concept to Physical Prototype
The collaborative effort translated Velontra’s Bronco hypersonic engine concept into tangible hardware in record time. Innovative 3D Manufacturing produced successive iterations of the afterburner casing, ramjet prototype, and other bespoke components, shipping them to Velontra often the next day after receipt of the digital design file. This rapid feedback loop enabled Velontra to test, evaluate, and refine designs almost in real time, mirroring the iterative testing regime of historic aviation pioneers. The speed of turnover was a decisive factor in keeping the project on schedule and within budget.
Testing Results at Purdue University
To validate performance, Velontra conducted wind‑tunnel tests at Purdue University, where the Bronco engine was subjected to simulated flight conditions exceeding Mach 4.5 at an altitude of 100,000 ft. The test data revealed that the engine generated thrust greater than Mach 5—more than five times the speed of sound—marking a significant milestone for a privately developed hypersonic propulsion system. Velontra claims this makes the Bronco the first of its kind to achieve such thrust levels in a practical, reusable format, underscoring the effectiveness of the AM‑driven development approach.
Future ambitions and Commercial Vision
Buoyed by the successful wind‑tunnel results, Velontra aims to integrate the Bronco hypersonic propulsion system into small aerial vehicles to enable supersonic travel for commercial and industrial applications. Additionally, the company envisions constructing an unmanned spaceplane that could serve as a reusable launch platform for small satellites. Continued reliance on additive manufacturing will be central to these goals, allowing rapid production of complex engine components, iterative performance improvements, and scalable manufacturing without the prohibitive costs associated with traditional aerospace fabrication methods.
Conclusion and Industry Implications
The Renishaw case study illustrates how strategic partnerships between AM hardware providers, specialist service bureaus, and innovative start‑ups can overcome traditional barriers in aerospace development. By harnessing the speed, design freedom, and material versatility of metal laser powder‑bed fusion, Velontra was able to accelerate its hypersonic program, achieve unprecedented performance metrics, and lay a groundwork for future commercial hypersonic and space‑access systems. The experience reinforces the growing role of additive manufacturing as a catalyst for rapid innovation in high‑stakes, technology‑intensive industries.