1. Copyright LOCKHEED MARTIN CORPORATION 2009 Fixing Sonic Boom John Morgenstern 1 March 2009 1 March 2009

2. 2 Copyright LOCKHEED MARTIN CORPORATION 2009 Sonic Boom 101 (Concorde)

3. 3 Copyright LOCKHEED MARTIN CORPORATION 2009 Why are N-Wave Booms so Bad? OVERPRESSURE, lb/sq ft (psf) TIME, milliseconds Rapid Pressure Changes in hearing range 30-300 Hz Slow Pressure Change below hearing range 3-8 Hz fundamental BOOM! BOOM!

4. 4 Copyright LOCKHEED MARTIN CORPORATION 2009 What’s a Low Boom? OVERPRESSURE, lb/sq ft (psf) TIME, milliseconds

5. 5 Copyright LOCKHEED MARTIN CORPORATION 2009 Why can Low Boom be Acceptable? OVERPRESSURE, lb/sq ft (psf) TIME, milliseconds 25-35dB Reductions in hearing range 30-300 Hz Slow Pressure Change below hearing range 3-8 Hz fundamental pump

6. 6 Copyright LOCKHEED MARTIN CORPORATION 2009 Environmentally Compatible Quiet Supersonic Transportation NASA N+3 Supersonics, Three Generations Forward in Aviation Technology http://www.saiqsst.com QUIET SUPERSONIC TRANSPORTATION: - Sonic Booms reduced to Sonic Puffs - Airport Noise and Emissions comply with subsonic rules - Breakthroughs in Supersonic Laminar Flow (reduced friction drag) and Computer Design Capability QUIET SUPERSONIC TRANSPORTATION: - Sonic Booms reduced to Sonic Puffs - Airport Noise and Emissions comply with subsonic rules - Breakthroughs in Supersonic Laminar Flow (reduced friction drag) and Computer Design Capability