According to the MarketsandMarkets’s graph, it shows that there will be a significant growth rate in the APAC – consisted of China, Japan, South Korea, and the rest of the APAC market during 2018–2024, because these countries are expected to commercialize delivery robots developed by them. Because of the virus outbreak, we are forced to stay at our home. This means that we will have to build parachute and adjust it into a better iteration.

Team DJBT is going to design a parachute that can sufficiently reduce the vertical falling speed of a parcel that weighs around 400 grams to 3-5 meters per second. To make sure there will be no damage to the wares inside. And to be confident with the accuracy of the drop. We need to make sure that the package has to drop inside a radius of 30 centimeters, starting from the destination because this is the standard

My partner and I have been researching a question about how does the size of a parachute affects air resistance? The reason we are continuously digging deeper into this topic is that we need to renew our knowledge of making parachute and air resistance. Which means, the key to making a higher quality parachute is to make iterations and modifications.

Although I lack resources, I can still make something out of what had in front of me. The first version was made out of a canvas bag, with a radius of 44 centimeters. For the suspension line, I used some thin kite string to replace the fishing line. The first version of the parachute used 220 centimeters of kite string in total; 55 centimeters per strand. The second iteration I made had some changes to it. For example, I changed the material of the parachute to thin cloth from the canvas bag. And, due to an increase in the area of the chute; the suspension line increased to 1 meter, which means it used 4 meters of string altogether.

 

 

 

 

 

 

 

 

 

Picture on the left version 1:                                 Box dimension  :                                                                        Material: Canvas bag and kite string                length: 15.5 cm

diameter: 44 cm                                                            width: 24 cm

suspension line length: 55cm                                height: 7.5 cm

Picture on the right version 2 :

Material: Thin cloth and kite string

diameter: 44 cm

suspension line length: 1 m

X1= iteration testing drops Y1= corresponding drop’s maximum speed

X2= iteration 1 and 2’s average Y2=corresponding drop’s average speed

 

 

Conclusion:

Looking after my two iterations’ results, I think that the 88 cm diameter one is better. The data clearly show that the bigger (the independent variable – the diameter of parachute). The more air resistance it will create, and (the dependent variable–the longer it will stay in air).

Which means the velocity decreases, it also verified my research information in blog post 1. It says the size of the parachute affects the speed of falling by displacing more air; causing it to fall slowly. Giant parachute will displace or push against more air, which will slow down a falling object.

My testing shows an average of 4.802 meters per-second. And a range from 3.955 to 5.664 meters per second. The graph shows a gradual decrease on the speed of iteration 2 with every drop.

I think this is because each time I try to drop it from a higher place, so it would have a longer time to spread out the parachute mid-air. Falling from a more top place may risk the possibility of affecting the accuracy of the drop.

Apparently, wind is stronger in the higher altitude, so if we drop a package very high up air turbulences will affect the accuracy. But as for a bigger chute like mine it will dispatch more air, or push against more air. So then it will create a great amount of air resistance.

For Project Collision, I think it is most beneficial if we use a bigger parachute.