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Model Rockets

Model rockets are made or assembled by hand, and propelled by a variety of means; the hobby can be quite simple, or very involved. This category will cover the information and skill levels on making and launching model rockets.

826 Questions
Inventions
Space Travel and Exploration
Model Rockets

When was the rocket invented?

The first rockets were invented in China sometime between the 9th and 13th centuries (A.D). These were black powder rockets that were essentially what we would call fireworks today, but were technically what are known as solid fuel rockets.

Significant improvements in solid fuel rockets were made by William Congreve in England in the early 19th century.

The Russian Konstantine Tsiolkovsky was the first to seriously propose a liquid fueled rocket in 1903.

The first successful liquid fueled rocket was built by Robert Goddard of the U.S., and patents were issued in 1914. Goddard's first successful liquid fueled rocket launch was in 1926 in Auburn, Massachusetts.

They were as much a psychological weapon as a physical one, for they were rarely or never used except alongside other types of artillery.

The first rocket reached space on October 3, 1942. It was the V2 rocket made by the Germans as a ballistic missile to deliver bombs during World War 2.

Sputnik Rocket, the first rocket to launch a payload into orbit back in 1957, was developed by the Soviet Union in the mid 1950s.

Vostok 8K72K, the first rocket used to launch a person into space back in 1961, was developed shortly after the sputnik rocket.

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Model Rockets

How do fins affect rocket flight?

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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Model Rockets
Engineering

Why do rockets have fins?

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.

757677
Space Travel and Exploration
Model Rockets

Why the rocket nose cone becomes very hot when it re-enters the atmosphere?

Due to the friction when the rocket re-enters atmosphere .the hotness comes because the work is done again frictional force

This does not happen on model rockets,of course.

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Model Rockets

How does the nose cone help a rocket fly?

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

596061
Inventions
Space Travel and Exploration
Model Rockets

Who invented rocket?

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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Model Rockets
Remote Control Toys (RC)

How long does it take to build a model rocket?

It depends on what type of rocket you are building.

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Home & Garden
Model Rockets
Paper
Paper Airplanes

How does weight affect the distance a paper plane flies?

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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Astronomy
Space Travel and Exploration
Model Rockets

How does a rocket work?

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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Model Rockets

What errors can happen in a model rocket?

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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Health
Conditions and Diseases
First Aid
Model Rockets

Why should you use rubbing alcohol on your daughter's swollen ankle?

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.

454647
Cars & Vehicles
Rules of the Road
Police and Law Enforcement
Model Rockets

How fast are you allowed to go when passing another vehicle?

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???

131415
Science
Nintendo Wii
Model Rockets
Biggest, Strongest, Fastest and Other Extremes

What is the strongest rocket?

The Delta II-Heavy used for Dawn is the strongest rocketin the Delta II class.

The Saturn V remains the largest and most powerful launch vehicle ever brought to operational status from a height, weight and payload standpoint.

414243
Model Rockets

How do you build a bottle rocket to stay in the air the longest time possible?

Since bottle rockets are designed to explode after a few seconds, the only way to extend time aloft is to buy those whose explosive "report" charge is located farther from the rocket nozzle.

All fireworks, rockets, and explosives are dangerous to handle, use, or alter. They can cause severe and irreversible injury.

394041
Crafts for Children
Model Rockets
US Army

Does payload in a model rocket affect it's launch height?

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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Space Travel and Exploration
Space Shuttle
Model Rockets

Why are rockets needed?

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!

394041
Space Travel and Exploration
WW1 Allied Forces
Model Rockets

How does the number of fins on a model rocket affect its flight?

Answer

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.

394041
Science
Earth Sciences
Model Rockets
Hot Air Balloons

What makes a rocket go up into the air?

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

212223
Toys
Space Travel and Exploration
Model Rockets
Robert Goddard

What if the successful rocket launches are over 100?

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

333435
Space Travel and Exploration
Space Shuttle
Model Rockets

What rockets have been destroyed in flight?

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

313233
Math and Arithmetic
Militaria
Model Trains
Model Rockets

How big is a 1-35 scale model?

Answer

Of what? A car? A ship?

Scale of 1/35 means the size of the model would be the dimensions of the Real Item divided by 35.
A 6-Foot man would be modeled as 2 inches. [ (6 X 12 ) / 35) ]

The classic model cars (plastic, static models) are 1/35. So this scale was commonly used by plastic model Army Tanks and the men that go with them. The 1/32 scale models seemed to have been introduced with airplanes, which is very close to the same size as 1/35 scale.

A 1/35 scale model of a typical 1960's car would be roughly 7 Inches long.

For comparison, 1/48 Scale or "Quarter Inch Scale" means 1 inch of the model equals 1 Foot. This is a common scale for model aircraft. A model of 1/48 scale would be smaller than the 1/35 scale.

Custermen


54mm Figures

For many years, toy soldiers were described in a different manner than a scale. A figure that was 54mm meant that the soldier measures 54 millimeters from the base of the figure to its eyes. It was not measure to the top of the head as most toy soldiers had hats that could be big or small and change the height of the figure.

A 54mm figure is very close to 1/35 scale and would be about 2 inches tall. Other sizes used for military figures are 90mm, 120mm and 200mm. Sizes of figures used by wargammers are 25mm, 15mm and even 10mm.

303132
Geometry
Model Rockets

Does shape make a difference in the nose cone on a rocket?

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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Miscellaneous
Model Trains
Model Rockets

How big is 1-48 scale model?

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.

151617
Remote Control Toys (RC)
Model Rockets

Were can you fly your model rocket?

Anywhere it is not windy or really dry.

252627
Head, Ears, and Nose
Body Piercing
Model Rockets

Is it normal to have a lump around the outside and inside of your nose piercing?

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.

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