is there laws on model rockets?
912714
The small ones you can purchase in a hobby store are usually not regulated and anyone can use them.  When you get to much larger models, there are rules and regulations that you will need to follow.  Check with the FAA, they will be able to fill you in on what you can and cannot launch without authorization or certification.
1086972
there is a laser,invented at the time of the cold war, i think in the 80's, it interfears with the rocket's laser targeting device,for example a tomahawk wont find the target an i think she will selfdestroy,but that laser gun was interdicted.I heard that exist an laser gun that could destroy an rocket,i heard about an experiment with the russian 2 war's rocket KATIUSHA,two of those rockets were destroyed.
767612
You will need to investigate the chemical mixture to use, there are common ones like black powder (Potasium Nitrate [saltpeter] + charcoal + sugar) I used to buy saltpeter at the drug store (in the olden days they gave it to boys to reduce sex cravings...) but I don't know if it is available there anymore...\n\nYou need 2 other components besides the fuel - 1. A nozzle, and 2. An igniter. \n\nThe simplest nozzle would be a straight hole drilled through a plug (that would close the bottom of your cylinder rocket body full of fuel). But a point to point cone shape would be better. Another alternative, I saw a design for a model rocket which used an empty CO2 cartridge (like a BB Gun would use) the cartridge end is very nozzle like and you just fill it with your fuel.\n\nFor the ignitor, there is something called nichrome wire, it is a thin wire that when you attach a battery to it, it gets hot (even easier though, they sell little ignitors at hobby stores for estes type model rockets.) You would have to mount the ignitor into your fuel and plug up any remaining space so that the fuel doesn't fall out...
907825
well you must mean bb gun. first off if you consider it playing you shouldnt even have one. and as far as the state law in illinois when i worked at a gun shop if it had a velocity of 700fps or more it had to be sold as a firearm with the same paperwork and background check as any firearm. state laws will vary though. dont consider it playing though. even a low powered air gun is capable of putting some ones eye out.
176148
Check out Estes Rockets and buy a complete kit, easiest way to get started.  Should be available in local stores also.
686782
All right, I'll do my best. \n\nTwo rockets scenario: \n\nAssumptions: Both the rockets are out rigged with the same engines/propulsion systems, and have the same aerodynamic profile.\n\nThe ignition of the fuel generates a constant thrust, which translates into a constant upward force. How a force translates into motion of a body is dependent on the body's mass, more mass, slower the acceleration... less mass, more the acceleration. Thus, the heavier rocket will accelerate at a slower pace.\n\nDropping 2 bodies of different masses:\nAssumptions: Both have the same aerodynamic profiles.\n\nGravitation is not a constant force, but is a constant acceleration. Thus the rate of change of speed is fixed. The forces 'experienced' by the two masses are not the same, and the heavier one 'experiences' a larger force than the lighter one, in effect to balance out and make them drop at the same rate.\n\nKey equation (even though you didn't want one) is \nForce (F) = mass (m) x acceleration (a)\n\nIn the rocket scenario, Force is constant, so if mass goes up acceleration must go down, and vice-versa\n\nIn gravitation, Acceleration is constant, so more mass experiences a larger force.
456737
rockets were not invented yet, they used canons
263378
While the nozzles are specifically engineered to prevent this, it is possible.  Do not do this.  Fuel/air explosions are powerful, the best outcome you could expect is permanent maiming.  I had a Chemistry professor who had lost 3 fingers playing with a methanol propellant aerosol can.  There are generally good reasons not to do stupid things, this would qualify as a stupid thing.
450016
Hi\nYou can just use a simple plastic water,drink or juice bottle.\n\nIMPORTANT NOTE:your rocket may not work if you use a screw lid.\n\nTo make rocket:\n1 Tape a straw to the side of the bottle:make sure that one end of the straw is within 1-2cm of the top of your bottle\n\nTo make launch pad:\n1 Insert skewer into a round piece of cardboard so that the skewer is standing securely upright.\n\nTo launch rocket:\n1 Insert one of the following fuels:\n   1x crushed alka-selzer tablet and 15ml of water \n   1 teaspoon of baking soda and 40mL of vinegar.\n2 Then put on the lid on as soon as the substance(s) are in the rocket.\n3 Place rocket on launch pad so that the skewer goes through the straw.\n4 watch in amazement as your rocket takes off!
625619
what the heck is a mentos rocket???  Do you put those little breath mint thingies inside a rocket and launch it?  That's weird.  Doesn't sound all that fun to me.\n\nWell, since I'm not sure what that is, I don't have any really good ideas.  \n\nBut here's some links for science fun\n\nhttp://www.funsci.com/texts/index_en.htm\n\nhttp://www.exploratorium.edu/science_explorer/
797391
I'm pretty sure a rocket-propelled grenade is not a shape charge(it's just a grenade mounted on a rocket-hence the name). I don't know what the temperature is, but it's gotta be high enough to melt most heavy metals.
526864
not pure sugar, but you can mix the sugar with a potassium powder and put that into model rocket engines and it will launch if you mixed it right.
862120
Bound's hubby here:\n\nNot that spud guns are legal here but, using carbide rocks and a little bit of water to create the gas, you can expect a low deep thud similar to a baseball bat hitting an empty 55 gallon drum. A nice deep thuuuud.\n\nEnjoy (but not if you live in New Jersey!)
896989
You can make a ball bearing launcher:\nhttp://my.execpc.com/~rhoadley/maglnch.htm\n\nYou can make your own levitating MagLev train:\nhttp://my.execpc.com/~rhoadley/magtrain.htm\n\nOther info is available here:\nhttp://www.kn.sbc.com/wired/fil/pages/listmagnetsan1.html
755385
If you are just looking for game laws.....your local game and parks will have a book of regulations laws....just check thier web site, or stop by the local office.....
570799
I think you talk about a Paintball Marker Tank. They are High Pressure Air Tanks, can shoot paintballs. 3000 psi is near 210 Bar (Atmosphere). It means Its not a toy :D
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).