![]() ![]() Though some bottles will launch 20 to 40 rockets, bottles will eventually fail and will need to be replaced. When headed out to launch, always have spare empty 2-liter soda bottles and duct tape handy.If using this technique, consider building several launchers for the class so that multiple rockets may be launched simultaneously. Younger students may make comparative altitude estimates using landmarks on buildings or flagpoles.Alternately, download the digital Data Sheet onto a mobile device that students can use to record the data. Be sure to print out a copy of the Data Sheet for each baseline (A and B) and have a student recorder for each baseline take the Data Sheet, along with a pencil and a clipboard, out to the launch area.To obtain an accurate angle of elevation, you'll want several Altitude Trackers on each baseline, so have each student team make one. If your students will be measuring the altitude attained by their rockets, allow time to construct the Altitude Trackers.While students finalize their rockets, examine them to ensure that they are airtight.If they are too tight, it will be difficult to slide the completed rockets over the launch tube. They should slide freely along the PVC rocket form. ![]() Be sure that the rocket-body tubes that students roll are slightly loose.Students may work in pairs to build more than one rocket to observe design differences. Working in pairs works best for younger students and can be useful for brainstorming between older students. Decide in advance if students will each build their own rocket or will work in teams. ![]()
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