Patent ID: 9267863
Filing Date: 2016-02-23
CPC Classification: G01L,G01M

Claim Text:
1. A propeller system comprising: first and second propellers positioned one behind the other and separated by a first propeller gap, and having a first and a second propeller hub, respectively, and at least a first and a second rotating force measuring device, respectively, at least first and second differential pressure sensors, and an evaluation unit, wherein the first and second rotating force measuring devices are mechanically connected to the respective first and second propellers and are so configured that they can measure the individual thrust force of the respective propeller; wherein at least one of the first and second differential pressure sensors is arranged on or in each of the first and second propellers and is configured for measuring a differential pressure between the first propeller gap positioned between the first and second propellers and a second and a third propeller gap on an opposing side of the respective first and second propellers, and wherein the evaluation unit is configured for determining a total thrust force of the propeller system by adding the measured individual thrust forces of the first and second propellers and by subtracting the gap area forces based on the respectively measured differential pressures.