British Experimental Rotor Programme (BERP) blades represent the - TopicsExpress

British Experimental Rotor Programme (BERP) blades represent the latest generation of rotor technology developed under a jointly funded AgustaWestland and UK Ministry of Defence rotor technology development and demonstration programme, the most advanced of which being the BERP IV design. The major features of the BERP IV blade were the use of a new aerofoil and the increase in blade twist from 6 to 16 degrees for increased lifting performance and lower hover power. During the dynamic design, an advanced aero-elastically tailored structure was developed to minimize fuselage vibrations. The aim of the dynamic design involved the reduction of key vibratory rotor head loads without increasing vibratory blade loads or pitch link loads above the levels of the existing BERP III rotors. A series of low pitching-moment aerofoils are used along the length of the blade, with simplified root and section blends. It also uses rubber-based tape from 3M to counter leading-edge erosion. As a result, an additional cruise speed of 10 knots and additional lift capability of 650 kg over the BERP III rotor blades were achieved, including enhanced battlefield survivability. BERP IV rotors have been installed on the AgustaWestland EH-101 helicopters and on the Future Lynx helicopter. The ring of clear air around EH-101 during dust landings, referred to as the “donut effect”, is due to the BERP advanced blade tip design. #Warwolf

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