If you want to make your rocket more aero-dynamic pop a cone on top and maybe a couple of fins at the side. No, I quite like the old fashioned Russian kind of sixties look. However, I didn't think Greg's wafer cone would make much of a difference at that jaunty angle. This reduces resistance and helps the rocket cut through the air. Most of our rocket builders put cones on the tope of their rockets. But, could they have made their rockets go any highly. If you're using a bottle of this size, then think straws should avoid mishaps. Presently he's looking a little bit wonky, but I'm confident.Ĭoffee stirrers and bread stick may have seemed a good idea at the time,but they couldn't support the weight of the rocket when it was fully loaded. Biodegradable and edible at the same time. I think mine's going to- I got, I got visions of mine going off like this.ĭan and Greg's rocket legs weren't strong enoughīread sticks. Mine's going off at a slightly jaunty angle. I don't think particularly the asparagus spears are strong enough to hold it. My rocket's got legs very much like Bambi. The other thing rockets need is stability on the launch pad. For every action there is an equal and opposite reaction. When the bottle is the other way around, the downward force of the gas and liquid gushing out, causes the bottle to fly up. The pressure build up, until the cork pops out.īicarbonate of soda for me. When you put the two of them together in a bottle, with a cork in the top, the carbon-dioxide gas has nowhere to go. Vinegar is a weak acid, and when it comes into contact with bicarbonate of soda, a chemical reaction takes place, and carbon dioxide is released. But that's a bit dangerous for doing at home, so we'll be using vinegar and bicarbonate of soda. Now both of these are highly flammable, which is great, because that creates thrust as they burn, which forces the rocket up into space. The Soyuz's rockets that take astronauts like Tim Peak to the international space station are fuelled by liquid oxygen and kerosene. But why? The answer lies in the fuel and the stability of the rocket. Some rockets have launched like the space shuttle, whilst others have been less successful. Well that's easy enough to do, cause you just bite the end off. That's looking like a proper space orientated vehicle. When you let go of the string, the spring should push the trigger up and over the cable tie ends.As part of Terrific scientific, stars across the BBC have been taking part in a bottle rocket challenge.īread sticks for legs, so it's a bit wonky.
The PVC trigger should drop, allowing the cable ties to open up. Test this trigger mechanism by pulling on the string.
Tape the other end of the string securely to the pipe with duct tape. Thread the string through the holes in the plastic spring. Then slide the 1½-inch PVC scrap over the pipe and cable ties. Slide the plastic spring onto the pipe, over the cable ties, and up against the pipe clamp. Remove the bottle from the end of the pipe.Thread the end of a 4-foot piece of string through the hole and tie a knot on it to keep it from coming out. Drill a small hole in the side of a short scrap of 1½-inch PVC pipe.This spring will hold the trigger in position until you’re ready to launch. Flatten the bottle section without creasing it and cut a 1¼-inch hole through both sides. Using scissors, cut the top and bottom off a 2-liter soda bottle.
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