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PROCEDURE 1. Put on safety goggles. 2. Using a pair of pliers, hold the lid on a scrap piece of wood and drill a 3/8-in. hole in the center of the bottle’s lid. DO NOT DRILL A SMALLER HOLE OR THE BOTTLE MAY CRACK—OR WORSE, EXPLODE. 3. Tape the straw along the length of the bottle to 9. Drain ALL of the unevaporated liquid out the hole in the lid and into the waste bottle. Tightly cap the waste bottle. WARNING: ALCOHOL VAPOR IS VERY FLAMMABLE SO IT IS VERY IMPORTANT TO HAVE ALL ALCOHOL CONTAINERS CAPPED AND AWAY FROM THE LAUNCH AREA BEFORE ANY FLAMES ARE LIT. STUDENTS SHOULD NOT BE CLOSE, AND A FIRE EXTINGUISHER SHOULD BE AT HAND IF THERE IS A PROBLEM. 10. Slide the bottle’s straw onto the carrier until the straw is up against the base of the U. Slide the aluminum foil heat shield so that it is above the lid (see above figure). 11. With safety goggles on, bring the lighter to the hole and light. With a “whoosh” the rocket should shoot down the string. VARIATIONS 1. It is possible to shoot the rockets vertically (see figure to the right). You will need a model rocket launch rail. You will also need to do this outdoors in an open area with no flammable material under the launch rail. Again, be sure to allow any liquid alcohol to drain before lighting and be sure there is nothing flammable below the rocket. 2. You may also want to try 2-L pop bottles for more altitude. 3. Have students tape or glue lightweight fins on their rockets for stability. 4. Try a launch with no lid screwed on the bottle, or try hole sizes larger than 3/8 in. (DO NOT USE HOLES SMALLER THAN 3/8 IN. BECAUSE OF PRESSURE CONCERNS.) Launching vertical rocket. Rocket Activity Heat sheild serve as a launch guide. 4. Using the pliers, bend the coat hanger into a U shape, with the base of the U about 2 in. long. Tape one side of the U to a straw and slide this onto the string so the base of the U points down range. This will serve as the rocket carrier. 5. Roll the piece of aluminum foil around a pencil, then remove it and slide the foil onto the string to act as a heat shield. 6. Tie one end of the string to a chair or other solid object, and then tie off the other end at least 20 ft away so it is level. 7. Put on the lid with the hole, and use an eyedrop- per to add 2 or 3 dropperfuls of alcohol to the bottle. 8. Cover the hole with your finger, and shake the bottle 20 to 30 times to vaporize the alcohol. Launching horizontal rocket. 5. Chemistry students can be given the heat of formation for different alcohols and then calculate the heat of the reaction. 6. Investigate the fuel/air ratio by trying different numbers of drops of alcohol and measuring the distance traveled. (Use a fresh bottle each time.) 74PDF Image | NASA Guide to Engines
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