The purpose of the Pangaroos is to deliver a portable charger in a box safely to the ground and we plan to do that by designing a parachute. Our research question is how holes in the parachute will affect the accuracy and drag of the package.
While designing and testing the parachute, I changed my parachute by changing the number of holes in the parachute, things that stayed constant was the size of the parachute, the length of the strings, and the material of the parachute being light plastic.
The first design has no hole in it, and the second design has one in the middle (might be hard to see). Challenges for both of the designs was to make and attach the rim of the parachute since it was a circular parachute and the rim had to curve around it the whole way.
All 10 of my drops had no bounces, which met our criteria of having none. The distance away from target has always been below 1 meter, the furthest being 0.8 centimeters, which was dropped by my parachute that had no holes, and the most accurate being 0.4 cm dropped by my parachute with a hole in the middle, and out criteria was at most 1 meter away from target. Finally, the fastest speed for every single drop was below 3 meters per second the fastest was 2.9 mps, the speed held by the parachute with 1 hole, and the slowest fastest speed (I hope this makes sense) is 2.1 mps, held by the parachute with no hole. Our criteria were to get the speed down to 5.12 mps. I am very surprised to see that every single criteria was met, but I always wonder how much more faster and how the accuracy would be affected if it was falling from 10m instead of 2, but the thing that surprised me most is still how I managed to make the fastest speed of my parachute was below 3 mps while the criteria was above 5 mps.
Having a single hole in the middle is the best for making a accurate parachute. I say that because my parachute with no hole has an average of landing 0.63 meters away from the target while my parachute with one hole in the middle has an average of landing 0.55 meters away from the target. But when my parachute does not have a hole in the middle, it falls slower, for example, the average fastest speed of the parachute with no hole is 2.38 meters per second, while the parachute with a hole has an average fastest fall speed of 2.62 mps. For our group, I suggest that we have a single hole in the middle. That is because my fastest fastest speed is 2.9 mps, while our criteria is 5.12 mps, but when I do not have a hole in the middle of the parachute, the distance away from the target can go up to 0.8 m, even though the criteria is 1 meter, it is still dangerously close to going out of 1 m and might go out of 1 m easily if there’s a slight breeze while it is landing. Therefore, I highly suggest that we have a hole in the middle so that it will not be easily blown away from target.