In the first stages of cannon designing, we wanted to halve the first tennis ball can and simply prop it up at a 45 degree angle. It was a very simple design that we thought would be effective due to our use of Boyle's Law and our math knowledge to determine the launch angle. We would prop the cannon up with open scissors that would simply be taped to the tennis ball can.
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Reflection
Since volume and pressure are inversely proportional according to Boyle's Law, we hoped to increase the pressure by cutting the tennis ball can in half. In reality, this action reduced the amount of oxygen to the point where it would be the limiting reagent in the ethanol-oxygen combustion reaction. We changed our design to compensate for this error and now have a full tennis ball can as the actual cannon.
I like how you told about the mistake then said how you corrected it.
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