Today we had to do two launches, at least one having had modifications to the bottle rocket. We decided to hot glue fins to the bottle, and do two launches with the fins. This way, we can see how durable they are and if they are properly placed, sized, et cetera. Our first launch went quite well, in the sense that it went straight up into the air and lasted approximately 5 seconds. However, I'm not quite sure whether or not it was the wind or if the fins were too big, but one of the fins came off, and the bottle floated with the wind for a bit.
For the second launch, we did the same thing. We used the same amount of water and pressure (500mL, and 40psi) , but the launch seemed to be delayed after i pulled the rope. The bottle only lasted 3 seconds in the air. This could be due to the face that it only had two fins on it, or perhaps a problem with the pressure and the pump.
Our next launch, we will cut the fins shorter, duct-tape them to the bottle (in addition to the glue that's already on it) and then we will add the parachute. I'm excited to see how that goes.
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