The aim of this particular study is to develop a full general aviation aircraft sizing exercise and also explore conformity challenges with present-day performance and certification requirements (as per EASA CS.LSA) relative to general aviation aircraft. There has been a steady flurry of announcements on the emergence of Hybrid Energy Aircraft whereby part of the climb, the full cruise and part of the descent are performed by means of battery power-propulsion to be conservatively relieved by conventional means for takeoff , approach and landing purposes. Hybrid-electric propulsion systems would present a viable alternative to conventional fuel-burning engines, with the potential to reduce fuel consumption and emissions. Hybrid-electric propulsion systems (HEPS) can indeed take advantage of the synergy between two technologies by utilizing both Internal Combustion Engines (ICEs) and Electric Motors (EMs) together, each operating at their respective optimum conditions. Various projects suggest that aircraft from small to large scale can benefit from HEPS, but the results obtained also indicate that the scaling effects are not directly transferable from one sector to another. In the medium-scale GA sector, the hybrid-electric prototype SOUL aircraft (Hybridization Factor = 60 %) suggests a fuel saving of up to 50 % for short mission profiles (< 1 hour). Increased hybridization of the powerplant leading to even higher fuel savings, but due to the relatively low energy density of batteries today, this increase in efficiency also results in a decrease of the aircraft range. For large-scale aircraft such as commercial airliners, a future fuel saving of up to 10 % has been calculated for HEPS relative to conventional turbofan engines in a current airframe. However, when combined with aerodynamic, materials and structural advancements hybrid-electric propulsion reveals a fuel saving potential of 70 %, together with significant benefits in emissions and noise. reduction. Dimensioning design variables were taken into account in Chen Mengxi MS Thesis in 2017 to perform preliminary designs also exploring sizing parameters, series, parallel, series-parallel hybrid, complex hybrid arrangements, performance contours and energy requirements with due regard to future environmental requirements expressed by ACARE. Even if she overly simplified in
طيار مهندس/ محمد الشعلان | Capt. Mehmed asch-Schaalan | 5201