Sustainable dual thrust hybrid rocket motor using polylactic acid as sustainer fuel in multilayered tubular fuel grain

Muhammad Nadzri, Mohamad Mukri Najmi and Mahat, Muhammad Yusuf and Ismail, Izham Izzat and Abdul Kadir, Siti Zafirah and Zazuzila Nadzri, Nur ‘Ain Najlaa and Azami, Muhammad Hanafi (2025) Sustainable dual thrust hybrid rocket motor using polylactic acid as sustainer fuel in multilayered tubular fuel grain. In: International Conference on Recent Innovations in Sustainable Engineering Solutions 2025 (ICONRISES 2025), 12-13 September 2025, Jember, Indonesia.

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Abstract

This study explores the thrust modulation capability of a hybrid rocket motor (HRM) using a novel multilayer tubular (MLT) fuel grain configuration. The fuel design integrates two distinct fuel materials paraffin wax as a booster and polylactic acid (PLA) as a sustainer arranged in concentric layers to achieve a dual-thrust profile. Two configurations (MLT 1 and MLT 2) were fabricated and tested, each varying in booster and sustainer web thickness. Experimental static firing results demonstrated that MLT 2, with a thicker booster layer, achieved superior performance with a higher specific impulse (106.349 s), regression rate (1.638 mm/s), and thrust (71.482 N) compared to MLT 1. Thrusttime profiles confirmed the successful replication of a boost-sustain combustion behavior. The results validate the potential of passive thrust modulation through fuel grain architecture, offering a sustainable and valve-free approach for dualthrust hybrid rocket applications.

Item Type:	Proceeding Paper (Invited Papers)
Uncontrolled Keywords:	Hybrid Rocket Motor, Dual Thrust Propulsion, Multi-Layered Tubular Fuel Grain.
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL780 Rockets
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering Kulliyyah of Engineering
Depositing User:	Dr Muhammad Hanafi Azami
Date Deposited:	30 Dec 2025 17:33
Last Modified:	30 Dec 2025 17:33
Queue Number:	2025-12-Q1217
URI:	http://irep.iium.edu.my/id/eprint/126286

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