Click the green flag to start the project. To spin the propeller, use the slider like you would in the original project. Press Space to change the type of propeller. You have a choice between three, four, five and six-blade propellers, I might add a two-blade one soon.
Credit to @jromagnoli for the original project. I don't have a spinner myself, but I see other students in my school with spinners. Honestly, I do think they're cool, but I would probably get bored rather quickly.