Our Hushkit utilizes a patented mixer/ejector concept to mix cool ambient air with the hot, high velocity engine flow before it leaves the exhaust system. The system consists of three major components:
- a lobed engine mixer nozzle to increase jet mixing and decrease jet velocity (the principal component of noise);
- a fixed ejector shroud to allow for additional jet mixing, thereby effectively increasing the engine bypass ratio and further decreasing the exhaust jet velocity, and acoustical lining to absorb noise; and
- a cascade thrust reverser to improve aircraft stopping power.
In addition to designing a system to meet the noise requirements, we also wanted to:
- Assure that the additional weight of the noise absorbing ejector would be offset by replacing the existing thrust reverser with a newly designed, lighter and more efficient cascade type reverser;
- Minimize the performance and handling impacts due to the additional length of the Hushkit;
- Reduce the stress on the engine attachment because the existing Stage 2 tailpipe already approached the maximum allowable;
- Assure that the vibration of the ejector would be so minimal so as not to create any dangerous fatigue problems for the Hushkit or the engine either through direct vibration during the most stressful moments of taxiing or indirectly by creating harmonics that might trigger sympathetic vibrations throughout the engine;
- Assure that the Hushkit installation would not only be FAA-certifiable, but also completely airworthy and reliable.
