Robert H. Spencer

Technology Best Practices

Robert H. Spencer, Randolph P. Johnston, 2002 .

The relative noise levels of parallel axis gear sets with various contact ratios and gear tooth forms

Fred B. Oswald, Joseph W. Lenski, Mark J. Valco, 1993 .

Influence of Gear Design Parameters on Gearbox Radiated Noise

Fred B. Oswald, Joseph W. Lenski, Mark J. Valco, 1994 .

Gear sound levels with various tooth contact ratios and forms

Fred B. Oswald, Joseph W. Lenski, Mark J. Valco, 1993 .

Measurement of Rotor Noise Levels and Evaluation of Porous Blade Tips on a CH -47A Helicopter

Harry Sternfeld, Robert H. Spencer, 1969 .

Operational Aspects of Helicopter Noise

Harry Sternfeld, Robert H. Spencer, 1964 .