How do you make a primitive flamethrower?
88124
Fill a super soaker with gasoline and once you get it spraying light a match in the stream. Don't do this, though, because it's terribly dangerous!
359525
Take a look at the pyrotechnics chapter of this side.\n\nhttp://www.vk2zay.net/\n\nCareful: it is neither simple nor without danger.
759887
Here's the best site I have found for calculating the velocity of the spud:\nhttp://ffden-2.phys.uaf.edu/211.fall2000.web.projects/J.%20Jones%20and%20T.%20Kenny/Projectile.htm\n\nThis is for a combustible firing chamber.  The pneumatic guns are more predictable and reliable since the pressure can be set prior to firing.  Where the combustible require calculating the air to fuel mixture based on the size of the firing chamber.  This is explained on another part of the site referenced above.\n\nThe best choice for this type of gun seems to the the solenoid valves that are common on sprinkler systems.\n\nThey also recommend that the barrel resistance be measured using a simple fish scale to find the force of resistance of the spud against the barrel.\n\nI also looked at a rifled barrel that provides better accuracy.\n\nMost spud gunners use parametric measurements to find the range of their cannon.  This is done using inclimeters for altitude and pressure gages to measure the max pressure in the firing chamber, while increasing the amount of fuel or air pressure and taking a series of measurements to find the characteristics of the cannon.\n\nenjoy\n\nj
224063
you need to Build Volcano Model... go to this page\nhttp://volcano.und.nodak.edu/vwdocs/volc_models/models.html
99133
Well, the way I always did it was to build your model volcano out of usually brown playdoh.  One of the better methods is to take a discarded paper towel cardboard center and glue it to some sort of paper (best more cardboard) then build your volcano around it making sure to keep the hole in th center open.  Pour baking soda into it...take it to school and at the precise moment pour vinegar into the baking soda...I think some people put food coloring into it (bright orange)
478699
You will first have to contact your municipality and see if they allow outdoor "recreation" fires. We built one in our back yard and used redbrick to do it. Dig a pit aprox 1 to 1&1/2 feet deep, and as wide as you need it. Level out bottom. Line with redbrick. Leave sides earthen. You have to remember to not stack the bricks around the top, this will prevent air flow.If you want a finished look for the top use one layer of bricks turned on their side so the holes in the bricks let the fire get air. If you just want an outdoor fire ring that you can cook on look on Gander Mountain's website. You will need to order a catolog, it's free. They sell fire rings that are somewhat inexpensive and you can put your cooking racks right on top to cook. We have both and use the ring more than the pit it's easier and can be taken inside over he winter. I hope this helps you out. Good Luck!!!\nhttp://www.gandermountain.com
1166498
The teepee method works the best. You might be stacking to much wood around the teepee, can't get airflow? Another way is to take two larger split logs and lay them side by side with a 1 foot gap in between them. Put balled up newspaper between the logs and then add small twigs, sticks and such over the paper, preferrably across and above the paper. Use the two split pieces to catch the ends of the stuff. Then once you light it add more pieces of wood just bigger pieces each time and it should catch just fine. If you use big enough side pieces you can even put a cooking rack on them and use your fire to make dinner. Just remember to use dry paper and dead wood or it won't work!!!  Good Luck!!!!
651459
yes\nburn it on a low flame
1025805
The trap should have two block valves, a vent and a drain valve.\n\nClose the two block valves. Open the vent valve to relieve the pressure and then the drain valve to remove any liquid. Opening the drain valve first can cause the pressure from the trap to stir up any dirt and rocks that might be in the area causing a spark and possible fire. \n\nYou should also have on hearing protection when this is done because the noise from the vent valve can be quite high.\n\nLeave the vent and drain valve open while you remove the end closure.
594888
dunno, but i kno how to make molotov cocktails XD\n\nfill bottle with liquid gas, light it, throw on target--3steps lol
577077
Chemical reactions are fun how about a baking soda volcano?\nor you can make an experiment showing air pressure and oxygen use, use a big clear jar( mayo peanut butter) a pie plate a bit of modeling clay a candle and some colored water and some pennies.\nplace the clay  in the center of the pie plate\nplace the pennies 2 or 3 high( you may wish to tape them, make 3 or 4 sets set them around the clay so they will support the jar up from the bottom of the pie plate\nplace a birthday candle into the clay  fill the pie plate with enough colored water to cover the edge of the jar and a little more when it is upside down on the pennies\nnow remove the jar, light the candle and replace the jar over it.\nThe candle will go out. this shows that fire needs oxygen and uses the oxygen in the jar.\nIf your jar is not too big you will see the water rise up into the jar. The gas in the jar has changed, it does not have the same pressure it did before the oxygen was removed. The pressure from the outside air makes the water rise. This demonstrates air pressure. Have the teacher light the candle. try it at home a few times you may have to change jar or glass size to get a good effect.\nI do not recommend the electric pickle experiment.
1052452
make anything out of the following\nperiscope\nvolcano (Although I don't suggest this - it is a very old project and maybe many will turn up using this)\nA mini hovercraft or hot air baloon (info can be found on net)\nI don't know what it is called but if you know that thing in which we have to take a small hoop across a wire (which is not straight) without touching it. If touched, it will make a sound.\n\nIf none of this suits you, you might watch Backyard Science at National Geographic Channel
969846
Take off the metal cover and lift up the small tab that you have to push, so that it doesn't turn the little wheel, and turn the tab all the way to the left. Place it down, so that it meshes with the circle and turn it to the right. Repeat until desired flame is achieved.
658125
It has it's flammable state...Try to imagine it as a fuel air bomb.Thn there you will get your Idea.
275531
There are two ways. One is to "Flame" polish. A propane plumbers torch or a small hand held butane torch will work. It takes a bit of practice, and if you dont move along the edge fast enough you can catch it on fire or melt it. Stay at the tip of the flame.\n The other way is to wet sand with silacon carbid sand paper, start with 100 grit about 10 strokes, then 320 grit 10 strokes then 600 grit 15 strokes, keep flushing your sand paper in water and keep the edge of the acrylic wet.\n Then put a cotton buff wheel in a drill, put some white buffing rouge onto the buffing wheel(while its turning) then buff the edge making lite level strokes across it, about four or five times, you dont want to heat it while buffing so dont lay into it, and wait in between strokes to let the heat diapate.  Last step is a clean new buff to take the grease of the rouge off and bring it to a super clear luster shine.  If you heat it to much when buffing it gets a white mare, if so you will need to resand and buff.\n In lou of a drill a place called caswell sells a nice 1100 speed standing buffer for about $150.
672629
Make a 3d model and print it out using anim8or @ anim8or.com\n\nIf that is not in option, try using a styrafoam block and carve it.
747028
as anyone who was in the Boy Scouts can tell you, there are many ways to produce fire without a flame. The ol rubbing two stciks together works but it does take a while. The very basics you need to make fire is a heat source ( friction ), tinder (dry grass or leaves ), or a spark from flint on steel.