Launching to the Moon Lab

On Friday, I did launching to the moon with Alice and Taryn. At first, we put the tube on the string, and then we taped the ping pong ball on to it. We then taped the 1st balloon on the it. It wasn't that successful, because it didn't go that far, probably about 2 inches off the ground. So, we took the tape off, so we could blow the balloon up more, and add another one too it, but the balloon popped. We added two more objects to the tube (the two red Lego sticks) so it would be heavier, and so we wouldn't have to launch that many rockets. Just when I was going to blow the 2nd balloon up, (the 1st for that round, we only had 2 balloons total) I was called to the front desk for a soccer game, so I didn't get to finish the lab. I think that if we had two balloons to tape to the tube, then the tube would go up more, because more air would be pushing it upward. I don't know if adding more weight to the tube would work or not, but I think it would, because then the tube would be a little heavier, and we would make less trips, and it is most usually easier to throw a tennis ball in the air than a feather.