ALLEGRA Design Airspeeds and Preliminary Loads

Kurzfassung

The report contains the design airspeeds and the preliminary loads based on manoeuvre and gust V-n diagrams for the ALLEGRA configuration. For the gust envelopes the Pratt formula of ACJ 25 was used. The ALLEGRA configuration is based on the final LamAiR configuration developed in the DLR project LamAiR. The ALLEGRA configuration has forward swept wings, a T-Tail, and rear fuselage mounted nacelles. The 150 passenger aircraft is originally designed for laminar flow and less fuel consumption. Within this report all necessary design speeds are given and all the relevant data for manoeuvre- and gust load analysis with respect to CS-25 and JAR-25 requirements are computed. For the manoeuvre V-n diagrams the actual requirements, the "Certification Specifications for Large Aeroplanes CS-25" from the European Aviation Safety Agency (EASA) have been used. To avoid time consuming rational analysis, as required by CS-25, gust V-n diagrams have been established by using the Pratt formula of JAR-25. Therewith the gust load factors for the rigid aircraft are estimated.