how can i bult a small rocket?
361899
Buy a kit.  They sell the solid fuel "engines" at any hobby store.  If you're under 18 you might need an adult's permission, and launch responsibly.\n\nOtherwise, it's loads of fun.
520077
Have you tried the Pressurised Bottle Rocket?\n\nEasily constructed with used plastic bottles. What you need is a pump, cork and a tube. Build some tail fins to stablise the rocket for flight. You need to put in some water in the bottle. Then just pump the pressure up and you have an entertaining setup.\n\nHave a challenge who can shoot the highest and then parachute the Rocket down. The highest and/or the longest hang time wins.\n\nYou will need a field to do this properly though.
11475
Well it is pretty easy to build a simple motor. There are instructions at this website.
980067
The rocket should be tall and rigid for stability. The rocket should have a tight fit onto that apparatus that is charging the rocket. You do not want ANY air pressure loses. make sure the PVC piping is built with solid air tight connections.
572514
Other methods involve pressurized air in a bottle with water, makes a crude rocket, there is some video of an asian guy who made a rocket suit with about 20 2 liter bottles hooked up to a pump system that shot him up in the air over water a ways, then he crashes down awkwardly.  Poor guy. Probably for a game show or something, idk.   \n\nOther rocket mixtures use liquid or solid fuel, depends what you mean and want when you say "Rocket".  Like are you trying to make something to play with in the yard, or trying to make your own ICBM?  \n\nAll you need is some source of thrust to be propelled out the back end which because of Newton's Law of Equal and Opposite reaction means that it can operate in a vacuum, with no medium to push against (unlike a propeller or jet engine or something of that nature).
588743
You can make a really tiny helicopter.
441665
Check the link below (sorry Yahoo doesn't like long links so joint the 2 together)\n\nGet training if you aren't already experienced or u are goign to bounce ... its not as easy as it looks .\n\nBlue skies
500012
make a catapult or a trebuchet\nmake a lever\nmake a hydraulic lift ( soda bottle hosing balloon housing for balloon like a box or can, something to lift}
99103
throw it into space as high as you can, or just use that nitro
709750
Big rocket on moon: Lots of reaction mass available, low escape velocity, no atmosphere to block the exhaust, and no greenies to complain about the noise and pollution. The moon is gravitationally bound to the earth, so if the moon is moved slowly and carefully enough, the earth will follow. Of course, we'll want to clean up the asteroid belt between Jupiter and Mars first. Great plan for solar main sequence survival.\n\nIn response to "addtional detail". For every action, there is an equal and opposite reaction. That means the gravitational force on the moon due to earth's gravity is exactly the same as the force on the earth due to the moon, but in the opposite direction. Now, since the earth is more massive, that means its acceleration is proportionatly smaller. Since the moon's orbit is circular (at present), that means the acceleration is centripetal and the earth's center orbits in circle of small radius. \n\nThe extreme limit of how hard you can pull on the earth with a rocket on the moon would be if you brought the moon to a stop relative to the earth. The moon will then start falling toward the earth, and the earth toward the moon (though more slowly). However, if you oppose the gravitational force on the moon with rocket thrust of equal an opposite magnitude, plus a bit more to match the acceleration of the earth in both sign and direction, the earth-moon distance with stay the same, and the pair will accelerate together. Note that the rocket exhaust is now pointed towards the earth; this can be avoided by vectoring it off to the side slightly. This added acceleration can be used to accelerate earth in the direction of its motion around the sun. This would cause the earth's orbit to slowly spiral outward. As I said, this is the extreme limit of how hard you can pull (unless you bring the moon closer). In practicle, one need only perturb the moon's orbit to get an effect; it'll just take longer.\n\nYes, one would need a phenomenal energy source to accelerate lunar material for rocket exhaust. Thermonuclear fusion would be the best bet for this. That only requires extacting the naturally occuring deuterium from water. I haven't done the math, but all the earth's ocean's might suffice; deuterium is less than 1% of the hydrogen in water, so we'd hardly miss it. There's lots of water in the outer solar system too, if needed.
721794
It's a pretty simple project. It's a car about the size of a matchbox car. But it's made out of lighter materials like wood or plastic. With a holes bored through the center in the shape of an "L" When the balloon is filled with air and released, the car moves forward by jet power from the escaping air. \n\nBasic directions: make or buy a small matchbox sized car made from plastic or wood. You can either drill two holes to form an "L" shaped passageway in the center of the car, or you can hollow out the car and glue small tubes inside it to make the "L" shaped passageway. Of course, you'll also have to put a small chimney with a lip on the top of the car; this holds the balloon in place. So, the balloon sits on top of the car. The jet exhaust points out the back.  Blow into the exhaust hole on the back of the car to blow up the balloon. Put your finger over the hole to keep the air in. Set car on the floor and release. As long as there are no leaks and the car's wheels spin freely, it should work fine. The lighter the car the faster it will go. The bigger the car, the more stable it will be. \n\nYou can try getting a pinewood derby kit from the local cub scout's supply store. However, you should replace the pine body with balsa wood. It's lighter. \nGood luck.
611254
any small airport that handles small jets will have it and they will sell you any amount. small commercial Fuel vendors some times also carry it in 5 gallon cans
701653
get 2 ) 2 liter soda bottles\nfill on with water.\ntape the empiy one to the full one ( opening to opening)\nturn them upside down and you have instant tornado in a bottle\nif that doesnt work shoot the bottles out at 200 mph that would be fun too
732007
I have made 2 liter bottle rockets using water, a tubeless tire valve, a bicycle pump and a 2 liter bottle.  It goes about 100 feet up if you do it right.
824167
The radius is actually 2/3 of the altitude.  Try that
781894
yes, use a wrist rocket with a #2 shot
198825
Sticking by the rules you specified;\n\nConstruct an inclined channel (ramp) where the 1 kg (2 lbs)weight (hopefully a metal ball) falls and accelerated by gravity. place the car that will catch and hold the ball at the end of the ramp. The falling ball's inertia will propel the car almost equal to its speed and may reach more than 1 meter on a flat even surface, design the car with low center of gravity, with less than half the weight of the propellant ball (weight) as a consideration.\n\n************* \n\nAh, New data acquired --- resolution: same application of inertial force using a rigid pendulum.\n\nConstruct a pendulum with the required height putting the fulcrum point at 10 cm directly above the floor of the car, giving you a swing radius of 10 cm from top to bottom, use a cardboard/plastic tube (shute) to carry the pill bottle but loose enough to set it free after a sudden stop once it reaches the bottom where the position of the pill bottle is parallel with the floor of the car. This configuration may not give you as much distance relying on gravity alone but may be able to get 1 meter if conditions are favorable, pertaining to weight of car and means of motion (wheel and shaft should be well oiled for free-wheeling), relevant to weight of falling object, unless you are allowed to spring load the fulcrum. You can put the fulcrum as part of the car (but it will add more weight/ but you wont need the shute, all components will be integrated), or as a separate launcher (which you will need the shute). make sure the center of gravity on the car is low for stability. when integration of all component is involved make the wheel base equally wide as 10 cm. If just for the pill bottle, just narrow enough to carry the bottle.\n\nmy idea: http://server4.pictiger.com/img/124010/other/1-kg-inertia-car.jpg\n\nInnovation is part application and part logical creativity. Isn't science great!\n~meow