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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)3 SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORTChief of Naval Research Ballston Centre Tower One 800 North Quincy Street Arlington, VA 22217-5660 NUMBER(S) DISTRIBUTION / AVAILABILITY STATEMENT Unrestricted Distribution SUPPLEMENTARY NOTES ABSTRACTA study to investigate the utility of seaplanes to support an offshore military Sea Base has been undertaken by the Center For Innovation In Ship Design. The potential use and importance of seaplanes for future sea-based military missions are discussed. The research outlines the history of seaplane development, their different modes of operation and associated enabling technologies. Parametric data collected on seaplanes has been populated into a database, presented and analyzed, leading to defining initial seaplane sizing requirements. Current technology boundaries and technical issues that need further research, including those related to integrating seaplanes within a Sea Base environment have also been identified. Issues such as rough water operations, mooring and beaching have been considered, along with new methods to take advantage of existing technology to operate in high sea states. Potential seaplane design concepts are presented, with recommendations for investment in particular seaplane technologies, such as lightweight materials, spray reduction designs, and novel landing/beaching gear. SUBJECT TERMS