Compressed Air Rocket

I built this rocket out of card paper, duct tape and a short piece of wood I sharpened to a point. The rocket went a lot farther than I expected, I think because the small, slim design gave it an advantage.  My rocket is 25.5 cm long.  According to my test results, my hypothesis is that the difference between test 1, 2 and 3 are explained by changes in air pressure at launch or changes in wind direction during flight.

This is my rocket

This is my rocket launching

Test Results

Time in air: test 1) 3 seconds. test 2) 2 seconds. test 3) 3seconds

Distance: test 1) 19 meters. test 2) 18 meters. test 3) 21 meters

My rocket went 7 meters per second that is 25 kilometers per hour