Propeller

The standard propeller for this electro  motor is a 30x8 inch plastic propeller. That is a diameter of 80cm. As the effectiveness of a motor depends on the propeller diameter, a larger one would be more apropriate.
For this reason I converted a 30 inch propeller with carbonfiber tubes to a 40 inch propeller, 101cm.
The thrust of the 30" should be about 120 N, increased with the 40" to 150N, nearly 15kg.
The propeller is well balanced and does not produce vibrations at higher RPMs.
Here is the comparative photo: