Rotor Blade Treatments to Minimize Electrostatically Generated Noise on the HLH Helicopter
Abstract
A laboratory investigation was undertaken to evaluate the severity of precipitation-static noise to be expected on the Heavy Lift Helicopter (HLH) low-frequency systems, and to define the requirements of techniques for noise elimination on the HLH. This investigation, using a 1/25th scale model of the HLH and actual proposed rotor-blade panel samples revealed the need for RFI protection on the HLH. Recommendations were made to install P-static dischargers on the HLH rotor blades, and the optimum number and location of these dischargers was discussed. Noise reduction afforded by various rotor-blade-coating systems was also investigated and reported. A recommendation was made for a particular coating system, based on noise-reduction and surface-resistivity measurements.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1974
- Accession Number
- AD0780720
Entities
People
- J. Solak
- R. Derosa
Organizations
- Boeing Rotorcraft Systems