Prototype 2
Developed Concept So to solve our first problem which was due to lack of materials we decided to change our initial idea a little, the image above shows our developed concept. So we decided instead of creating three cuboids we would create one main cuboid in the middle, however we would double the size of the cuboid to 40cm x 10cm. This would also help to make the centre of the span more secure. Material Testing 3 Another problem we faced was because the crossed elements were very loose (as shown in the image on the left) due to the joints being right on the edge we realised that they got squashed very quickly and soon started to loose balance. To help ensure that they are able to sit on the table more securely we decided to strengthen and interlock the joint together using 1mm cardboard stuck on with double sided tape (as shown on the image on the right). Therefore it will help the overall model be more stable and rigid. Prototype 2 After carrying out all the improvements from the last prototype, we then decided to a pre-test to see how successful those changes actually were. Although the model was a lot more firm and stable it actually only managed to hold 2.3kg, before the bridge actually fell down as one of the slits actually got teared apart. As we was a very competitive team we decided this wasn't as good enough as we would like therefore we decided to make some further developments as we felt we could do much better.
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