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  • Cruise noise of the 2/9th scale model of the large-scale advanced propfan (LAP) propeller, SR-7A [microform] / James H. Dittmar and David B. Stang.

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service, 1987]
    • 1987-1987

  • Potential reduction of en route noise from an advanced turboprop aircraft [microform] / James H. Dittmar.

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service, 1990]
    • 1990

  • Detailed noise measurements on the SR-7A propeller [microform] : tone behavior with helical tip Mach number / James H. Dittmar and David G. Hall.

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service, 1991]
    • 1991

  • An evaluation of some alternative approaches for reducing fan tone noise [microform] / James H. Dittmar and Richard P. Woodward.

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service, 1992]
    • 1992

  • A concept for a counterrotating fan with reduced tone noise [microform] / James H. Dittmar.

    • Text
    • [Washington, DC : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service, 1992]
    • 1992

  • The effect of swirl recovery vanes on the cruise noise of an advanced propeller [microform] / James H. Dittmar and David G. Hall.

    • Text
    • [Washington, DC] : National Aeronautics and Space Administration ; [Springfield, Va. : National Technical Information Service, distributor, 1990]
    • 1990

  • Reduced perceived noise low tip speed fans as result of abandoning cutoff stator vane numbers [microform] / James Dittmar.

    • Text
    • [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center ; Springfield, VA : National Technical Information Service, distributor, [1998]
    • 1998

  • A fan concept to meet the 2017 noise goals [microform] / James H. Dittmar.

    • Text
    • [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center ; [Springfield, Va. : National Technical Information Service, distributor, 1998]
    • 1998

  • A fan concept to meet the 2017 noise goals [microform] / James H. Dittmar.

    • Text
    • [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center ; Springfield, VA : National Technical Information Service, distributor, [1998]
    • 1998

  • Some acoustic results from the Pratt and Whitney Advanced Ducted Propulsor [microform] : Fan 1 / James H. Dittmar and David M. Elliott, Lawrence A. Bock.

    • Text
    • [Cleveland, Ohio] : National Aeronautics and Space Administration, Glenn Research Center ; [Springfield, Va. : National Technical Information Service, distributor, 1999]
    • 1999

  • An estimate of the enroute noise of an advanced turboprop airplane [microform] / James H. Dittmar.

    • Text
    • Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center, [1986]
    • 1986

  • Some design philosophy for reducing the community noise of advanced counter-rotation propellers [microform] / James H. Dittmar.

    • Text
    • [Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center, 1985]
    • 1985

  • Preliminary measurement of the noise from the 2/9 scale model of the large-scale advanced propfan (LAP) propeller, SR-7A [microform] / James H. Dittmar.

    • Text
    • [Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center, 1985]
    • 1985

  • An experimental investigation of reducing advanced turboprop cabin noise by wing shielding [microform] / James H. Dittmar.

    • Text
    • [Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center, 1986]
    • 1986

  • Laboratory experiments on active suppression of advanced tuboprop noise [microform] / James H. Dittmar.

    • Text
    • [Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center, 1985]
    • 1985

  • Noise reduction for model counterrotation propeller at cruise by reducing aft-propeller diameter [microform] / James H. Dittmar and David B. Stang.

    • Text
    • Cleveland, Ohio : National Aeronautics and Space Administration, Lewis Research Center, [1987]
    • 1987
    • 1 Resource

    Available Online

    http://purl.access.gpo.gov/GPO/LPS92375

  • A possible explanation for the present difference between linear noise theory and experimental data for supersonic helical tip speed propellers [microform] / James H. Dittmar.

    • Text
    • [Washington, D.C. : National Aeronautics and Space Administration, 1983]
    • 1983

  • Noise of the SR-6 propeller model at 2⁰ and 4⁰ angles of attack [microform] / James H. Dittmar, George L. Stefko, and Robert J. Jeracki.

    • Text
    • [Washington, D.C. : National Aeronautics and Space Administration, 1983]
    • 1983

  • Fan noise reduction achieved by removing tip flow irregularities behind the rotor--forward arc test configuration [microform] / James H. Dittmar, Richard P. Woodward, and Michael J. MacKinnon.

    • Text
    • [Washington, D.C. : National Aeronautics and Space Administration, 1984]
    • 1984

  • Further comparison of wind tunnel and airplane acoustic data for advanced design high speed propeller models [microform] / James H. Dittmar.

    • Text
    • [Washington, D.C.] : National Aeronautics and Space Administration, [1985]
    • 1985

  • Cruise noise of the SR-2 propeller model in a wind tunnel / James H. Dittmar.

    • Text
    • [Washington, D.C.] : National Aeronautics and Space Administration, [1989]
    • 1989
    • 1 Resource

    Available Online

    https://purl.fdlp.gov/GPO/LPS108240

  • Cruise noise of the SR-2 propeller model in a wind tunnel [microform] / James H. Dittmar.

    • Text
    • [Washington, D.C.] : National Aeronautics and Space Administration, [1989]
    • 1989
    • 1 Resource

    Available Online

    http://purl.access.gpo.gov/GPO/LPS108240

  • The alternative low noise fan / James H. Dittmar [and four others].

    • Text
    • Cleveland, Ohio : National Aeronautics and Space Administration, Glenn Research Center, September 2000.
    • 2000-9
    • 1 Resource

    Available Online

    https://purl.fdlp.gov/GPO/LPS59301

  • The alternative low noise fan / James H. Dittmar [and four others].

    • Text
    • Cleveland, Ohio : National Aeronautics and Space Administration, Glenn Research Center, October 2000.
    • 2000-10
    • 1 Resource

    Available Online

    https://purl.fdlp.gov/GPO/gpo51422

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