German to English Tech/Engineering Aerospace / Aviation / Space

1. Apologies for relying on translated version due to technical hitch.
2. The wanted term appears only once

Aufstellen eines Flugversuchsversuchsprogramms, Durchführung und Auswertung im Hinblick auf eine Systemidentifizierung
nach FAA AC120-45A für die ….

Diagram A-1.13: Aircraft's *Spritsystem*
To calculate the center of gravity of the fuel in the tank, a simplified model of the tank was built. The following simplifications were made :
1) The gradient of the fuel tank towards the horizontal plane (conditioned by the V-wing's V-form of 5.5°) was presumed to be a constant. (Diagram A-1.14).
2) For a simpler modeling of the tank the three replacement system tanks had a rectangular diameter. The extension of the replacement tanks in x- direction was determined in such a manner that their volume accorded with that of the real tanks. The extensions in y- and z- direction remained unchanged ( see Diagram A-1.15).