We cut off 4 identical fins from cardboard and by having find would allow the bottle to fly in a straight and this would allow the bottle to travel further.
We sliced off the bottom of the 2 bottles that we are using and inserted 1 into the other. To secure it, we used superglue on the inside and also tape around the outside to prevent it from getting pushed out if the air pressure is to high.
We cut the fins with a curve so it would fit perfectly on to the cardboard
We covered the corners of the cardboard with the glue gun and once it hardens it will keep the cardboard in place and prevent it from bending.
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