Donate
7-PAS09

How does the number of propeller blades affect the outputted force at a constant RPM?

Physics and Astronomy
Jasper Byerley

Grade:
7
Teacher:
Marisa Kleiman

For my science fair project this year I am trying to find how different numbers of propeller blades affect the outputted force at a constant rpm. My results are measured in Newton meters(Nm). The procedures to complete this project include building a custom cart and attaching a Nm scale on one end and a 12 volt motor on the other end. I then attached 3D printed propellers ( 2, 3 and 4 blades) onto the motor's axle to spin the propeller and generate force, pulling the cart forward. By the end of the experiment the results were unexpected. My hypothesis was that the 4-blade propeller would create the most force, but the3-blade propeller had the highest average force output.


Project presentation

View Project Presentation file

One thought on “How does the number of propeller blades affect the outputted force at a constant RPM?

  1. I very clear and concise experiment with interesting results. We actually changed to 3 blade rather than 4 or 5 blade ceiling fans and receive more air circulating around us. We were surprised at that fact. Thoroughly enjoyed reading this project.

Comments are closed.