Here's a rephrased version of your list:
- Whirlybird model
- Scissors
- A minimum of three paper clips
- Stopwatch
- A volunteer to assist
- An elevated location for dropping the whirlybirds, such as having an adult stand on a chair or ladder. If safe, you might consider dropping them from a second-floor window or balcony on a calm day, but this should only be done under adult supervision.
- Laboratory notebook