Evaluation of hovering thrust performance of shrouded rotors for multi-rotor UAVs to reduce weight

Hikaru Otsuka, Keiji Nagatani, Kazuya Yoshida

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


In this study, we experimentally evaluated the hovering performance of shrouded rotors for small multi-rotor unmanned aerial vehicles (UAVs). In a shrouded rotor, the rotor is surrounded by a round duct. This rotor is superior to normal open rotors because it protects the rotary wing, reduces noise, and improves hovering performance. However, shrouded rotors have not been used much in small UAVs because they increase the weight of the UAV body. To design a shroud that maintains the hovering performance at a reduced weight, we evaluated the effects of different shroud shapes on the hovering performance. We examined three components of a shroud that affect the aerodynamic performance: (1) the shroud position to the rotor, (2) the diffuser length, and (3) the length of the inlet curve. The experimental results confirmed that the hovering performance was improved with a compact shrouded rotor compared to an open rotor. We were able to reduce the shroud weight and maintain the improved hovering performance of the shrouded rotor for small UAV flight.

Original languageEnglish
Title of host publicationAIAA Atmospheric Flight Mechanics Conference, 2015
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624101328
Publication statusPublished - 2015
EventAIAA Atmospheric Flight Mechanics Conference 2015 - Chicago, United States
Duration: 2015 Jan 52015 Jan 9


OtherAIAA Atmospheric Flight Mechanics Conference 2015
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering
  • Modelling and Simulation


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