Hoh Aeronautics, Inc. Research Update David G. Mitchell Technical Director 310-325-7280 [e-mail]

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Hoh Aeronautics, Inc.Research UpdateDavid G.
MitchellTechnical Director310-325-7280dmitchell
_at_hoh-aero.com

• SAE ACGS Committee Meeting
• Williamsburg, VA
• October 2006

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Handling Qualities Requirements for Maritime,
Cargo, UAV Rotorcraft

• Small Business Innovation Research Contracts from
  NAVAIR
• Completed Phase I
• Phase II expected to start early 2007
• Working with Advanced Rotorcraft Technology
  (under a separate Phase II SBIR from NAVAIR)
• Update ADS-33E-PRF requirements
• Multiple flight and ground simulation programs
• Produce ADS-33 Software Application Package

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Research Facilities

• Sikorsky simulator
• ART simulator
• NASA Ames VMS
• NRC variable-stability Bell 205
• Navy CH-53

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Key Research Topic Nonlinearities

• How do we deal with nonlinearities in frequency
  and time responses?
• Cases to the right all looked the same to one
  pilot in a fixed-base simulator
• Specs lack analysis techniques and guidance to
  the user for such cases
• Nonlinearities are common in rotorcraft
• Rotor/mast modes
• Slung load modes
• FCS limits and switching

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ASAP ADS-33 Software Application Package

• Will assist user in interpretation of
  requirements and compliance
• MATLAB toolbox
• Supported by Bob Heffley
• Eventually plan to incorporate elements of
  Heffleys TPV (Task/Pilot/Vehicle) toolbox

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Other Ongoing Research at HAI

• FAA Rudder Study
• Initial contract (write test plan) completed
• Received additional funding for simulation study
  on NASA Ames VMS
• Identify requirements for simulator motion
• Four-week session in November
• NASA Dryden Contract to Investigate Handling
  Qualities Criteria for Aircraft with Failed
  Surfaces
• Extend interaxis coupling criteria from
  rotorcraft
• Assess risk of pilot-induced oscillations