The Guillows 5" diameter Red propeller is an interesting accessory for adding air-moving capability to your device!
We've had some requests for larger propellers for projects involving wind-power models and wind-speed detection. We've brought in the very popular Guillows 5" P5 propeller. I remember using this propeller when I was a kid with my "Sleek Streek" model airplanes!
Measuring 5" in diameter, this propeller has a 0.050" hole in the middle (matching 0.050" music wire). You will want to drill it out a bit to make it fit most motors. The pitch on this propeller is pretty heavy, so you'll want a high torque motor to spin it with authority (or several strands of #2 rubber!).