WASHINGTON, D.C., — April 21, 2026 : The Intelligence Advanced Research Projects Activity (IARPA) has issued a Request for Information (RFI IARPA-RFI-26-01) to assess the current state of biologically derived materials for use in transient propulsion systems for unmanned aerial vehicles (UAVs). The notice, published on April 20, 2026, expands ongoing U.S. research into transient technologies by targeting propulsion components rather than structural airframes.
Scope of the RFI
The RFI seeks technical input on whether bio-derived materials can be applied to propulsion subsystems—including turbines, engines, electric motors and auxiliary components—while maintaining operational performance during mission execution and degrading in a controlled manner afterward. Current propulsion systems rely on metal alloys, engineering plastics and advanced composites engineered for long-term durability. As a result, UAVs that are lost or downed can leave recoverable components in operational environments for extended periods.
IARPA is examining whether alternative materials can reduce the persistence of such hardware. The agency is specifically interested in materials that can sustain required performance thresholds and subsequently degrade under environmental conditions, limiting the possibility of recovery and technical exploitation.
Transition from Structural to Propulsion Systems
The initiative builds on prior work conducted under the Defense Advanced Research Projects Agency program known as ICARUS program (Inbound, Controlled, Air-Releasable, Unrecoverable Systems). That effort demonstrated the feasibility of transient airframe materials using ultraviolet-triggered photopolymers and mycelium-based composites capable of degrading on command.
However, propulsion systems introduce significantly more complex requirements. Internal components operate under high temperatures, sustained mechanical stress and exposure to fuels and lubricants. Because these systems are enclosed, ultraviolet-triggered degradation mechanisms used in earlier programs are not considered reliable. As a result, IARPA is prioritizing degradation triggers based on environmental and biological mechanisms, including enzymatic activity, microbial action, humidity, thermal cycling, oxidation and pH variation.
Candidate Materials and Technological Basis
The RFI identifies several categories of materials under consideration. These include structural proteins such as silk, keratin and collagen; polysaccharides such as chitin and cellulose; fungal and mycelium-based composites; bio-acrylic materials; bio-derived ceramics; and broader biocomposite systems. Additional materials referenced include wood, paper, gums, cottons and waxes, which have seen limited defense-related applications.
Recent developments in synthetic biology and biomanufacturing are central to this effort. Advances have enabled the production of genetically engineered structural proteins with tailored mechanical characteristics, as well as polymers designed with programmable degradation profiles that respond to specific environmental triggers.
Technical Requirements and Performance Criteria
IARPA is requesting detailed technical responses addressing whether such materials can meet defined operational thresholds. These include the ability to withstand temperatures exceeding 500 degrees Celsius and mechanical stresses above 100 megapascals while maintaining dimensional tolerances and surface finishes required for propulsion system reliability.
Respondents are also asked to address multiple integration and engineering considerations. These include compatibility with existing propulsion architectures, interaction with fuels and lubricants, electromagnetic properties, manufacturability, quality assurance processes, production scalability and projected cost structures.
The agency has outlined five primary performance objectives for candidate technologies: achieving operational performance comparable to conventional materials during mission duration; enabling controlled transience triggered by environmental conditions beyond ultraviolet exposure; ensuring predictable degradation kinetics suitable for mission planning; minimizing residual material after degradation; and supporting scalable manufacturing compatible with rapid prototyping and production timelines.
Submission Guidelines and Timeline
Responses to the RFI are due by 5:00 p.m. Eastern Time on May 15, 2026. Submissions must be provided electronically in PDF format to [email protected]. The point of contact listed in the notice is Dr. Michael Patterson, Program Manager.
Submissions are required to include a cover sheet, executive summary, detailed technical response and optional references, following specified formatting requirements. IARPA has stated that the RFI is issued for planning purposes only and does not constitute a formal solicitation. Information received may inform future research initiatives and could support the organization of an invitation-only workshop.
Operational Context
The effort is aligned with operational requirements in intelligence and military missions where UAVs are deployed in denied or contested environments and recovery is not feasible. Under such conditions, propulsion systems capable of degrading after mission completion would reduce the intelligence value of captured hardware and address the long-term environmental persistence of debris.
IARPA notes that while laboratory demonstrations of bio-derived transient materials have progressed, significant gaps remain between experimental results and the performance demands of real-world propulsion systems. The RFI is intended to identify approaches capable of bridging this gap and advancing the applicability of transient technologies to active propulsion components.
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