Abstract
This paper presents a summary of research toward extending the flight duration of fixed-wing unmanned aerial vehicles at ADE. A historical context to extended flight is provided and particular attention is paid to research in establishing the best operating profile for the Reciprocating Piston engine to meet the extended endurance target. With the limitation of the fuel capacity in the UAV, it is imperative to identify and operate the UAV at the lowest fuel consumption regime without compromising the mission objectives. Usage of variable pitch propeller along with operation of mixture control of the engine has resulted in the extension of endurance of up to 12 h. Autonomous flying presents a unique set of challenges whereby the flight computer of the aircraft must command and control the engine to be operated at the best operating regime. The basic mechanisms of variable pitch propeller operation are examined. During the present work, automation tables were evolved to aid the flight control computer.
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Abbreviations
- c:
-
Specific fuel consumption
- Ct:
-
Coefficient of Thrust
- CL:
-
Coefficient of Lift
- CD:
-
Coefficient of Drag
- E:
-
Endurance
- m:
-
Mass flow of air
- T:
-
Thrust
- η:
-
Propeller Efficiency
- Wo:
-
Gross Weight of Aircraft
- W1:
-
Empty weight of Aircraft
- L/D:
-
Lift to Drag Ratio
- V:
-
Forward Velocity
- Vo:
-
Air Entry velocity
- Vj:
-
Exit Velocity
- VPP:
-
Variable Pitch Propeller
- W:
-
UAV weight
- FPP:
-
Fixed Pitch Propeller
- GCS:
-
Ground Control Station
- HST:
-
High Speed Taxi
References
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Anderson JD (1991) Aircraft performance and design. Tata McGraw Hill Education Private Limited. Section 5.14, p 302
Vijayanand P, Rajesh M: Rustom-1 Installed thrust data with constant speed propeller, Report No. ADE/RADT/REP/01/2015
Lycoming Flyer: Operations Manual
Acknowledgements
It is a pleasure to acknowledge the assistance rendered during the course of this study by Technicians of PSD division, ADE for the effort put in integration of the engine with governor, actuators, fabrication of support brackets, and cowling modifications. Sincere thanks to Director ADE, DRDO for permitting the publication of this work.
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Mahadevappa, R., Virupaksha, T., Raghavendra, L. (2021). A Practical Approach to Enhance the Flight Endurance of a Fixed-Wing UAV. In: Mistry, C., Kumar, S., Raghunandan, B., Sivaramakrishna, G. (eds) Proceedings of the National Aerospace Propulsion Conference . Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-5039-3_17
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DOI: https://doi.org/10.1007/978-981-15-5039-3_17
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