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Stefan Frei, Urban Mäder - Case Study 2006 Technology and Inovation In order to consistently compare airplanes, similar working points must be chosen for each of them. We chose the point where the airplane is at maximum takeoff weight, with as much payload as is still feasible (red circle). The APK factor can then be computed using the data from these diagrams by the formula1: APK = Fuel / (Payload x Range) [kg/(kg x km)] 5. Results Airplanes from several manufacturers in several variants have been considered. The year of first appearance on the market was decisive. The oldest airliner is the Boeing 707-120 from 1957, the newest the Airbus 380-841 from 2005. Table 1 contains a list of all airplanes, with the calculated APK. In Figure 3, the data samples are plotted, along with a polynomial least-squares fitted curve. 6. Conclusion The data samples suggest a technology speed of at about 2.2% per annum. Due to the fundamental limits mentioned above, it is not clear whether this development will be persistent in the future, without another technological breakthrough. 1 Operational Empty Weight OEW and Maximum Takeoff Weight MTOW used are given in the Aircraft Operators Manual AOM Figure 2. Range / Payload Diagram for Boeing-707-320 [3] 4PDF Image | Technology Speed of Civil Jet Engines
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