We used the helicopter template from the R SixSigma package. Our experimental factors were body height, wing length, paper type, paper size (A4 vs A5), and paperclip or not. The paperclip and size are interesting because they have a big effect on how the flight looks, but not a big effect on the flight time.
The experiments were performed at the Science Street Fair hosted by the Auckland Museum of Transportation and Technology (MOTAT), March 29, 2015. Replicate 1 was done in the morning; replicate 2 in the afternoon. The drop height was approximately 2.2m. Times are in seconds.