| 摘要 |
The aim of the invention is to reduce disturbing noises in a CROR engine (30). This is achieved by a propeller blade (32, 34) for a propeller engine (10, 20, 30) with at least two counter rotating propellers (24, 26), said propeller blade (32, 34) having a front edge region (38) that is to be arranged at the front in the direction of rotation (62) and a rear edge region (40) that is to be arranged at the rear in the direction of rotation (62). The propeller blade is characterized by at least one of the following measures: a) the entire surface or at least one surface region of the propeller blade (32, 34) has an acoustically effective surface compressibility and/or a sound absorber (45); and/or b) the rear edge region (40) has a toothing (66) in order to reduce turbulences behind the propeller (24) that is provided with the propeller blade (32). |
