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    Variable/Multispeed Rotorcraft Drive System Concepts

    Stevens, Mark A. / Handschuh, Robert F. / Lewicki, David G. | NTRS | 2009

    Concepts for Variable/Multi-Speed Rotorcraft Drive System

    Stevens, Mark A. / Handschuh, Robert F. / Lewicki, David G. | NTRS | 2008

    Efficiency testing of a helicopter transmission planetary reduction stage

    Handschuh, Robert F. / Rohn, Douglas A. | NTRS | 1988

    Engine Conceptual Design Studies for a Hybrid Wing Body Aircraft

    Tong, Michael T. / Jones, Scott M. / Haller, William J. et al. | NTRS | 2009