MUMBAI, India, Jan. 9 -- Intellectual Property India has published a patent application (202521116061 A) filed by Patil Om Sachin; Patil Piyush Sharad; Patil Niraj Pravin; Patil Gaurav Mahendra; and Chaudhari Mangesh Bhaurao, Pune, Maharashtra, on Nov. 24, 2025, for 'design and testing of a hybrid pulsejet-ramjet engine for enhanced low-speed propulsion.'
Inventor(s) include Patil Om Sachin; Patil Piyush Sharad; Patil Niraj Pravin; Patil Gaurav Mahendra; and Chaudhari Mangesh Bhaurao.
The application for the patent was published on Jan. 9, under issue no. 02/2026.
According to the abstract released by the Intellectual Property India: "The present invention relates to a hybrid pulsejet-ramjet propulsion system developed to achieve efficient thrust generation across low to transonic speeds. Conventional pulsejet engines can operate from rest but become inefficient at higher velocities, while ramjet engines deliver superior performance at high speeds but are incapable of producing static thrust. This invention overcomes these limitations by combining both technologies into a single integrated unit that starts as a valveless pulsejet and transitions automatically to a ramjet around Mach 0.5. The engine incorporates an optimized intake, combustion chamber, and convergent-divergent exhaust nozzle to maintain stable airflow and combustion characteristics throughout both operational modes, ensuring reliable performance without the need for auxiliary propulsion or mechanical switching mechanisms. Computational and experimental studies confirmed the hybrid engine's capability to deliver continuous and efficient propulsion with a throat pressure of about 52,800 Pa, throat temperature near 240 K, and exit velocity around 528 m/s. A scaled prototype fabricated from heat-resistant alloys validated these findings under laboratory testing, demonstrating smooth mode transition and improved specific impulse. The system's compact structure, reduced mechanical complexity, and enhanced fuel efficiency make it ideally suited for unmanned aerial vehicles (UAVs), target drones, and short-range aerospace vehicles. By integrating the simplicity of pulsejet operation with the aerodynamic efficiency of ramjet propulsion, the invention offers a lightweight, reliable, and cost-effective solution for next-generation air-breathing propulsion systems."
Disclaimer: Curated by HT Syndication.
