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2. Rolls-Royce/SNECMA M45H - Wikipedia

   en.wikipedia.org/wiki/Rolls-Royce/SNECMA_M45H

   A derivative of the M45H-01 turbofan, designed [when?] to demonstrate ultra-quiet engine technologies, needed for STOL aircraft operating from city centre airports. A geared, variable pitch fan, replaced the first stage of the low pressure (LP) compressor.

3. Geared turbofan - Wikipedia

   en.wikipedia.org/wiki/Geared_turbofan

   The geared turbofan is a type of turbofan aircraft engine with a planetary gearbox between the low pressure compressor / turbine and the fan, enabling each to spin at its optimum speed. The benefit of the design is lower fuel consumption and much quieter operation.

4. The 10 Best Air Compressors for Pros and DIYers - AOL

   www.aol.com/10-best-air-compressors-pros...

   The foundation of an air-powered tool arsenal is a good air compressor. Consider these expert-recommended electric models from Makita, DeWalt, and Craftsman. ... quiet motors, and low price make ...

5. Turbofan - Wikipedia

   en.wikipedia.org/wiki/Turbofan

   Consequently, the HP compressor need develop only a modest pressure ratio (e.g., ~4.5:1). US civil engines use much higher HP compressor pressure ratios (e.g., ~23:1 on the General Electric GE90) and tend to be driven by a two-stage HP turbine. Even so, there are usually a few IP axial stages mounted on the LP shaft, behind the fan, to further ...

6. Friedrich Air Conditioning - Wikipedia

   en.wikipedia.org/wiki/Friedrich_Air_Conditioning

   The Q-Star had other variations, such as K-Star (ultra quiet), X-Star (digital) and TwinTemp (heat/cool). [12] The Q-Star was replaced by the "Q" chassis Kühl models in 2012. TwinTemp: Built in both "QuietMaster" and Q-Star configurations, these units provided both heating and cooling settings in one unit. They were replaced by the electric ...

7. Propfan - Wikipedia

   en.wikipedia.org/wiki/Propfan

   Propulsive efficiency comparison for various gas turbine engine configurations. In the 1970s, Hamilton Standard described its propfan as "a small diameter, highly loaded multiple bladed variable pitch propulsor having swept blades with thin advanced airfoil sections, integrated with a nacelle contoured to retard the airflow through the blades thereby reducing compressibility losses and ...