Create and improve

After gathering materials, we created the base first and then the crossbow.

 

 

This is the result after the first creating class. However, we found out the lid did not go successfully as we expected. The plastic lid has a smooth, thick surface; it’s incredibly challenging for us to pinch perfect holes for the arrow.  We tried our best, and we realized the hole surged the arrow’s stability as it surged its friction, which had a massive impact on the crossbow.

 

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In addition, we found that this type of base is more stable than our planned one.

 

 

Considering our targeted audience, we decided to paint it in bright colors to cover the dullness of the woods to make the product more eye-catching.

Testing Video and Feedback

 

Video Player

Anonymous feedback 1: The arrow seemed sharp and pointy; I recommend improving the safety.

Anonymous feedback 2: Good demonstration of elastic energy; well done.  Maybe you guys can make the product safer.

 

 

This is our final result of the crossbow; in order to fix the friction problem, we changed our arrow stabler on top of the lid instead of using the lid itself. Furthermore, we replaced the arrow with paper straws to make it less harmful, and we will stick a piece of the blue tag on the tip of the straw to cover its sharpness.

Here is an organized graph of our changes and improvements.