Several fan blade failure incidents were experienced during the CFM56's early service, including one failure that was a cause of the Kegworth air disaster, and some engine variants experienced problems caused by flight through rain and hail. The first engines entered service in 1982. The program was saved when Delta Air Lines, United Airlines, and Flying Tigers chose the CFM56 to re-engine their DC-8s and shortly thereafter it was chosen to re-engine the Boeing KC-135 Stratotanker fleet of the U.S. By April 1979, the joint venture had not received a single order in five years and was two weeks away from being dissolved. Despite initial export restrictions, it is the most used turbofan aircraft engine in the world, in four major variants. The completed engines are marketed by CFMI. The engines are assembled by GE in Evendale, Ohio, and by Safran in Villaroche, France. GE produces the high-pressure compressor, combustor, and high-pressure turbine, Safran manufactures the fan, gearbox, exhaust and the low-pressure turbine, and some components are made by Avio of Italy and Honeywell from the US. Both companies are responsible for producing components and each has its own final assembly line. CFMI is a 50–50 joint-owned company of Safran Aircraft Engines (formerly known as Snecma) of France, and GE Aerospace (GE) of the United States. military designation F108) series is a Franco-American family of high-bypass turbofan aircraft engines made by CFM International (CFMI), with a thrust range of 18,500 to 34,000 lbf (82 to 150 kN). If you have any additional questions about CFM as it relates to a ceiling fan you are interested in, please call our fan experts at (877) 445-4486.The CFM International CFM56 (U.S. You’ll find the airflow, power usage and airflow efficiency metrics listed in the product details for each of our ceiling fans. Instead of handling calculations yourself, we make that part easy for you. Embrace Ceiling Fan by Fanimation Fans How to Determine CFM + Efficiency Metrics Also, consider a ceiling fan with a light powered by an integrated LED kit for further efficiency. Look for fans that operate at a high CFM and low wattage to increase the efficiency of the power usage in your home. You could have a fan that moves a lot of air (with a high CFM) but does so at a high wattage, making the fan inefficient. A CFM of 75 is the minimum number to make a fan efficient. Airflow efficiency is the CFM divided by the watts/amount of energy used to run the fan at its highest speed. 52-Inch Haiku Bamboo Indoor Ceiling Fan by Big Ass Fans CFM + Measuring Airflow EfficiencyĬFM is key when determining a fan’s airflow efficiency. Ultimately that means the greater the CFM, the more air a fan moves. The number depends on a few things: the fan’s motor, the blade pitch and the length and/or shape of the fan blades. When the ceiling fan is at its highest speed, the measurement is taken using both the volume of air and the rate at which it moves. Also referred to as airflow, the CFM is how much air a fan moves. What Does CFM Mean?ĬFM stands for cubic feet per minute. To determine a ceiling fan’s efficiency, you need to know its CFM. One of the main reasons to have a ceiling fan is to help reduce energy costs-but that’s only if a fan is efficient.
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