Abstract: The planetary gear comprises a sun wheel seated on an impeller shaft of a jet engine, planet wheels rotatable on bearing pins which are clamped at one side, and a hollow wheel ring gear. As a result of centering by the planet wheels, the sun wheel provides a bearing for the impeller shaft and the hollow wheel provides a bearing for a slow shaft of an electrical engine. Another bearing for the slow shaft may be designed as a radial/axial bearing arranged in the gear housing. The hollow wheel 10 itself is radially elastic and is fastened to the shaft by way of a thin-walled annular extension.