Accession Number:

AD1005599

Title:

Development and Investigation of a Flapping Rotor for Micro Air Vehicles

Descriptive Note:

Technical Report

Corporate Author:

University of Maryland College Park United States

Personal Author(s):

Report Date:

2007-01-01

Pagination or Media Count:

140.0

Abstract:

This thesis describes the concept, design and testing of a micro air vehicle rotor testbed capable of independently controlled blade rotation and powered blade flapping. The design, dubbed the Flotor, combined the benefits of a conventional MAV helicopter rotor with avian based flapping motion. The Flotor was tested as a conventional rotor, a conventional rotor with powered blade flapping, and a torqueless, freely rotating rotor with powered blade flapping. As a conventional rotor with a maximum figure of merit of 0.5, the results from the Flotor were similar to previously published experiments. With conventional rotation plus powered blade flapping at up to 8 per rotor revolution at a reduced frequency of 0.6, the maximum thrust increased by up to 15 due to delayed stall. The torque required at moderate thrust levels was reduced by up to 30 . The results from a 2-D quasi-steady blade element momentum analysis predicted average rotor loads accurately below 20 deg collective. As the first attempt at a torqueless flapping MAV rotor, the Flotor was capable of producing thrust and blade loadings comparable to flying animals, but less than current MAVs.

Subject Categories:

  • Aircraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE