Results Yes, it does affect the airflow while having more propeller angle and maintaining the same RPM. Every other angle that was not the flat one had more propulsion with the same RPM. So, when you have more angle and more RPM makes an airplane go faster. I tested angles 15, 20 and 25, and resulted that at 25 came out to be the one with the highest propulsion (68 mph with 170 RPM).