This taper is used to secure the propeller to the crankshaft. It is a standard feature on most aircraft engines, including Rotax models.
The taper on the crankshaft allows the propeller to be attached securely and easily, while also providing a degree of flexibility that is essential for absorbing shock loads during operation.
It's important to note that there are different types of tapers used for different types of propellers, and it's crucial to use the correct taper and propeller combination for your specific engine model.
