5,703 research outputs found
Empirical measurements of small unmanned aerial vehicle co-axial rotor systems
No full textSmall unmanned aerial vehicles (SUAV) are beginning to dominate the area of intelligence, surveillance, target acquisition and reconnaissance (ISTAR) in forward operating battlefield scenarios. Of particular interest are vertical take-off and landing (VTOL) variants. Within this category co-axial rotor designs have been adopted due to their inherent advantages of size and power to weight ratio. The inter-rotor spacing attribute of a co-axial rotor system appears to offer insight into the optimum design characteristic. The H/D ratio has been cited as a significant factor in many research papers, but to date has lacked an empirical value or an optimal dimensionless condition. In this paper the H/D ratio of a SUAV has been explored thoroughly, reviewing the performance of these systems at incremental stages, the findings from this study have shown that a range of H/D ratios in the region of (0.41-0.65) is advantageous in the performance of SUAV systems. This finding lends itself to the theory of inter-rotor spacing as a non-dimensionally similar figure, which cannot be applied across a spectrum of systems; this could be attributed to the viscous losses of flight at low Reynolds Numbers (< 50,000
Emma Bell Miles journal, 1911-1914
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1911 January 9 to 1914 May 3
Emma Bell Miles journal, 1908-1911
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1908 May 24 to 1911 April 25
Emma Bell Miles journal, 1915-1918
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1915 November 11 to 1918 August 8
Emma Bell Miles journal, 1915-1918
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1915 November 11 to 1918 August 8
Emma Bell Miles journal, 1911-1914
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1911 January 9 to 1914 May 3
Emma Bell Miles journal, 1908-1911
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1908 May 24 to 1911 April 25
Optimizing performance variables for small unmanned aerial vehicle co-axial rotor systems
No full textThe aim of this project was to design and build a test-rig that is capable of analyzing small unmanned aerial vehicles (SUAV) co-axial rotor systems. The intention of the test-rig development was to highlight important aeromechanical components and variables that dictate the co-axial units flight performance, with the intention of optimizing the propulsion systems for use on HALO® a co-axial SUAV designed by the Autonomous Systems Lab at Middlesex University. The major contributions of this paper are: an optimum COTS co-axial configuration with regards to motor and propeller variations, a thorough review and validation of co-axial rotor systems inter-rotor spacing which in turn identified an optimum H/D ratio region of between (0.41–0.65
Emma Bell Miles journal, 1915
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1915 June 15 to 1915 September 22. The journal also includes newspaper clippings of Miles' Fountain Square Conversation column authored for the Chattanooga News
Emma Bell Miles journal, 1915
No full textJournal authored by Walden's Ridge naturalist, artist, and author Emma Bell Miles from 1915 June 15 to 1915 September 22. The journal also includes newspaper clippings of Miles' Fountain Square Conversation column authored for the Chattanooga News
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