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The fins on a rocket they stable the rocket so it doesn't fly all over the place and so it will fly straight and better.

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The fins on a rocket are just there to create stability. As long as there are enough to provide a restoring force against a disturbance, it shouldn't matter. But ...

Enough means at least three, symetrically placed, with enough area so that when the rocket tips off of its path a little bit the fins provide aerodynamic force to put it straight again. If you only had two, a disturbance in the plane of the fins would not get corrected and the rocket would veer off course. With three, any tipping off of the flight path hits at least one of the fins in a way to correct the misalignment. Four works, too. Any more than that and you're just adding drag, which will shorten the flight.

Note well that the key parameter is the area of the fin times the distance it's lift center is behind the mass center of the rocket. That's why something with the fins behind the engine nozzle works so well, because the lift center is behind the entire rocket. Before I knew that rule I built a seriously overpowered rocket with gigantic fins that came all the way up to the nose. Instead of flying with great stability as I expected, it jumped off the launch rod and headed for launch control, then writhed on the ground like a beached whale until the parachute charge went off.

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a flat surface would have air resistance and a cone doesn't

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Rockets have been around for thousands of years. The Ancient Chinese and Greeks both experimented with basic rockets. But, the modern rocket that most people would recognize was invented by American Robert Goddard prior to World War I.

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It depends on what type of rocket you are building.

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Aerodynamics teaches us that the heavier an object, the faster (more energy) is required across the wings to achieve lift. Moreso, the material that a plane is made out of has a limit to the amount of force it can handle. There will come a point where the plane can no longer overcome the force of gravity on it's mass.

it is heavier and fly lower it is heavier and fly lower it is heavier and fly lower it is heavier and fly lower more weght at the nose is better

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The critical part of a liquid-fueld rocket that provides it with its ability to "fly" is the combustion chamber, sometimes, but not always, including a shaped nozzle, positioned at the rear (bottom) end of the vehicle. The combustion chamber is open at one end. In its simplest form the chamber is bowl-shaped (a half-sphere) with its open end pointing down, away from the vehicle. The Saturn V, used for the Apollo missions, used this kind of combustion chamber. Combustible liquids are pumped into the chamber. This may consist of a single, essentially self-igniting, liquid, or it may consist of two or more liquids which, when combined, can be made to combust. The Saturvn V used kerosene (the fuel) and liquid oxygen (the oxidizer).

When the engine is "lit" so that the fuel is burning (more like "exploding") inside the combustion chamber it creates tremendous pressures inside the chamber. Some of that pressure is against the upper, inside portion of the combustion chamber, and it is that pressure (force) against the upper inner surface of chamber that propells the rocket. Since the chamber is open at one end the forces in that direction cause the combustion exhaust gases to exit the chamber. This causes an "exhaust plume" out of the back of the rocket engine.

Some have described this as being a situation where the exhaust plume "pushes" the rocket, or that it is the exhaust plume that causes the rocket to move, or that the rocket "rides on top of a trail of fire". But that is not the case and is not a correct way of describing what happens. The exhaust plume does NOT move the rocket. The exhaust plume does NOT cause the rocket to move. Rather, the combustion pressures inside the combustion chamber causes both the rocket motion AND the exhaust motion.

Some have also noted that, since Sir Isaac Newton's Third Law Of Motion states that " For every action, there is an equal and opposite reaction ", it is therefore the rapidly exiting gases from the rear of the rocket that cause the rocket to move forward.

Again, this is not a correct description of the situation. Yes, the Third Law of Motion applies to the rocket. Yes, there is both a forward motion of the rocket and a backward motion of the exhaust gases. But it is not correct to say that the one (exhaust gasses) CAUSES the other (the rocket motion). Yes, there is a mathematical, physical relationship between the motion of the exhaust and the motion of the rocket (taking in to account their respective masses), and given a measurement of one you can calculate the other (e.g. knowing the velocity and mass of the exhaust gasses and the mass of the rocket you can calculate the velocity of the rocket). But it is NOT valid to say that the rocket motion is CAUSED BY the exhaust gas' motion.

The correct view on this is that both the motion of the exaust gas and the motion of the rocket are caused by the combustion pressure inside the combustion chamber.

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the charge can go wrong, the aim wire can break, and of course the classic the rocket tips over and then shoots across a flat field.

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I can not think of any reason you would want to do that? RICE is the key... Rest, Ice, Compress i.e ace wrap, Elevate.

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i recently read you are allowed 5 mph over or under the posted speed limit. and also that when you are legally passing a vehical you must got 10mph faster then the car you are trying to pass. is this true???

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Yes it does; depending on the wind changing. Sometimes a payload will slow it down and sometimes it will guide the rocket in the correct direction giving accuracy and distance.

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well it depends on what you mean by "needed". The Rocket, as a tool for both rudimentary aerial and space travel and exploration was developed early in the Ming dynasty by the Chinese, and perfected almost 2000 years later by an American named Dr. Robert Goddard. The rocket has found its most profound use in space travel, and is used primarily because of its ability to provide thrust without atmospheric oxygen. This is what makes rockets differ most profoundly from jet engines, in that the oxygen needed to create and sustain combustion is found in the fuel of the rocket (either solid or liquid, but most often the latter). Hope this helps, if there are any other questions just ask!

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3rd law of force by newton.every action has an equal and opposite reaction well there is a combustion chamber in the rocket where fuel and gases are burnt using liquid oxygen.they are thrown out of the rocket with tremendous force and they equally and in the opposite direction push the rocket ahead

You can have different kinds of ways to make a rocket fly. you an use a pump to pump the rocket up into the air, put a antacid tablet to make it fly

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I heard that it doesnt matter. By the way, if you didn't know, by going into space you can catch Jirachi. I would advise that you have either a Master Ball or quite a few Timer Balls/Ultra Balls. Namely 100+. Good Luck! :P

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See the Web Link to the left for a listing. Page 2 of the link has non-fatal disasters.

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Yes because if the cone is not straight it will make the rocket go offside; wonky, and you would not fly straight. It is also harder to control

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Models that are 1/48 scale can easily be measured by using the following:

1/4 of an inch on the model = 1 foot on the real thing

1 inch on the model = 4 feet on the real thing

etc.

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Anywhere it is not windy or really dry.

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It sounds like you have an infection. Soak a chamomile tea bag in hot water and then place it on the lump for 10 to 15 mintues. Do this for about 2-4 days and the lump should go straight away. If this does not work, contact a body piecer for advice.