10 9 8 7 6 5 4 3 2 1 BLAST OFF!

The weather was great and the students were lined up to watch the science demonstration. The rocket was going to fly up into the air. BUT it didn't go according to plan. It turned out the pump was faulty and leaked air so the bottle couldn't get enough pressure to launch into the air far enough. Mr Devonport's bike pump helped and the rocket was able to travel 20-30 metres.