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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.
270 Questions
Disadvantage to having fins on a rocket?
It makes it more streamlined and reduces drag and it keeps it on a good flight path and a good trajectory. Also if it falls down, it keeps it stable and on the front where it will hit the floor first it will be reinforced in some sort of way.
It also helps with balance and stability, the same way that a three-legged stool is more stable than something with only two legs (like people.)
How do you make a bottle rocket go further in the air?
1. Reduce the total mass (make it weigh less)
2. Improve stability- the greater the stability the straighter the rocket's flight the higher it will go, an unstable rocket will spin about erratically which greatly reduces the peak altitude (height)
3. Don't launch when it's cold and windy- both of these affect the rocket's altitude
4. Reduce the Cd (coefficient of drag)- this is rather complicated, you usually worry about this when you are designing a rocket, not after it's built. However, painting your rocket will help.
5. Get a bigger/more powerful motor!- the motor probably affects a rockets altitude more than anything else.
When does a model rocket reach its maximum height during flight?
In my short career as a model rocket launcher we did this. There was a tall pole near our launcher. I called the company that installed the pole and they told me it 73 feet tall.
Someone, usually my younger brother, would be located much farther away from the launch site. After each launch, his job was to estimate how high (or how many of those poles he thought) the rocket flew before falling back down.
Answer:Simple geometry is needed - after all you are using a rocket and must have some math and science skills. An observer at a distance follows the flight of a rocket along a moveable bar. The angle of the bar at the top of the trajectory and the distance of the observer from the launch pad is converted into altitude by the formula:
cot A =adjacent/opposite
where A id the observed angle fromthe horizontal, the adjacent is the distance to the pad from the observer, and opposite the height of the rocket.
All that's needed is to reorganize the equation and finf the cotangent of the angle:
Opposite = adjacent/cot A
How does impulse affect rocket flight?
The higher the impulse of a particular motor, the larger and faster and higher it will cause the rocket to travel. Impulse is a term that describes the relative strength of a rocket motor. The impulse of a given engine is found by multiplying the average force that the motor will push with by the number of seconds that the motor will push. Model rocket motors are usually measured using the metric system, where the units of force are "newtons". If a motor pushed with a force of 10 newtons for 3 seconds, this motor would have an impulse of 30 newton-seconds (usually written 30 N-s). This is the same impulse as a motor which pushes with a force of 3 newtons for 10 seconds. When choosing between two motors with the same impulse, the decision to use a shorter duration with higher force or longer duration with lower force, is made based on the amount of drag and the mass of the rocket and other factors, but these factors are usually much less important than selecting the impulse of the engine. In the United States, model rocket motors use a letter desigtation followed by a pair of numbers, such as "B-6-4". The letter describes the approximate impulse of the motor. "A" motors have around 2.5 N-s of impulse, "B"s have twice as much impulse as "A"s, "C"s have twice as much impulse as "B"s etc.
What does thrust do on a model rocket?
Thrust is the main component in rocket building. It is the driving force. Im totally joking your so effin gay...wtf is wrong with you...get a girl and stop going on wiki answers like an old saggy ball pedeifle...get a freaken life you overweight assclown
Do you need to have a permit to launch a model rocket?
some you need a license but most you don't you can get them at most Hobie shops
How long does a model rocket motor last?
Provided they are kept in a dry, cool, and stable environment, they should last indefinitely. The ingredients are non-volatile, so they do not really degrade over time.
If you want to know how long they burn for, you need to look at the rating on the side of the rocket. A higher thrust number means that it will burn for a shorter amount of time. Most small model rocket engines burn for 3 to 5 seconds.
What are the basic parts of a model rocket engine?
Propellant Controls - usually tail fins Gyro - keeps rocket on course Payload
What are the purposes of the fins on a rocket?
The fins on early rockets were used to control the direction of flight. Fins act to stabilize the vehicle, too. Most modern rockets have motors mounted on gimbals, so that the trajectory of the rocket can be controlled by changing the direction of thrust. That's why fins are absent on contemporary rockets. Note that they are still present on the small, hobby vehicles because they improve performance.
Is smoke coming out of a rocket a indicator that the engine is producing thrust?
not exactly,there could be powder coming out of a hole or puncture in the rocket.that could cause an explosion sending flaming debree everywhere.you should inspect the rocket first.if you see lots of smoke you can:
a.throw a rock at it while it is still low to the ground
b.send another rocket at it to make it explode
c.DON'T LAUNCH ROCKETS WITHOUT INSPECTING THEM!
How do you assemble the Estes model rocket launch stand?
They all come with very detailed instructions, follow them carefully. Most important is gluing the fins absolutely parallel to the body. Also use a light glue like crazy glue, rather than white glue.
Where do you launch a model rocket?
We find places out in the country where there are no buildings or trees for at least 5-6 blocks around. Favorite places are where land has been cleared for building on , but building has not yet started.
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
Why do you put four fins on a rocket?
because they don't need anymore than three fins to keep them on straight course
How long does a rocket travel?
Generally unguided rockets used as weapons do not travel as far as missiles, which is the term for guided weapons. Rockets used as fireworks only travel a few hundred feet vertically. Model rockets may reach a height of a mile or more. Rockets used to launch satellites propel the payload above the atmosphere, which expends most of their fuel.
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.
What are the phases of a model rockets flight?
it starts with the pelvic thrust then erection and then boom goes the dynamite
Which type of rocket uses propellants?
Usually something that will burn hot and hard enough so that the expanding gasses will provide thrust enough to get the rocket airborne.
What does the launch lug in a model rocket?
Model rockets launch by sliding up a rod/wire that is pointing toward the sky. A launch lug is a small tube (like a drinking straw on a small rocket) glued to the side of the rocket body. You slide the small tube (launch lug) down on the rod. The launch lug and rod guide the rocket to start it in the correct direction until it gets going fast enough that the fins can stabilize it.
Visit the links below. The first picture shows a rocket on the rod. It's a little hard to see but the rod goes through the launch lug. At the very beginning of the second link, they are sliding a large rocket lugs onto the rod.
Should a pop bottle rocket have a cone?
When designing a pop bottle rocket, your objectives are to minimize weight and drag.
Think of the pressure in the bottle as a fixed ammount of energy that will be turned into velocity of the rocket per Energy = 1/2 * Mass * Velocity^2. As your rocket flies up into the sky, two things will happen to that energy. First, the energy will change into potential energy per Energy = Height * Mass * Gravity. (Gravity = the rate of acceleration due to gravity = 9.8 meters / second^s.) Second, the energy will be lost to friction. As your rocket flies through the air, it will bump trillions of trillions of air molecules and give its kinetic energy to them.
To minimize this bumping, you want to make it easy for the rocket to push the air molecules out of the way. This would be best accomplished by a long, slowly tapering nose-cone. Keep in mind that the heavier your nose cone, the less velocity you get.
What is the mass of a model rocket?
- Model rockets can use anything from 1/4A to G engines.
- Amateur rockets can use up to N engines.
- Professional rockets have no limit.
Each successive engine letter has twice the power of the previous. Assuming Professional rockets start with O engines, the smallest Professional rocket engine has 256 times the power of the largest Model rocket engine. Most will of course be much larger.
How big is a 1 50 scale model?
It depends on what the original model was. If the original model was 100 inches, then a 1/50th scale would be 2 inches.
How do to make a bottle rocket?
You can strt by first constructing the rocket body. Using a sheet of computer paper build the body of the rocket and fold it half lengthwise. Cut the paper in half as folded and then take one half and fold it further in half, do it cross wise.
Now you should have one half of the original sheet along with two quarters of it. Fold one of the quarters to half and fold in half one more time but diagnally. Cut along the creases which is created from the folding in order to create four triangles which can be used for the fins. Now you have to take the other quarter and draw a circle on it. Cut it out and mark its center. Sketch two lines which should form a right angle from that point. Cut out the portion marked by those lines and make a cone out of it. Next, take the half of the paper and tape it around the canister. You need to place the canister along one of the edge of the paper and make sure that the opening of the canister should point outside of the cylinder formed by the paper. Now, tape the fins on the part of the cylinder paper which is near to the canister while tape the cone on the other end.
Hope this helps.
What shape of fins should be for a model rocket?
Obviously, you want your rocket to fin to have the most effect while minimizing drag.
IM ASSUMING YOUR USING A 1 LITRE SODA BOTTLE
4 fins are usually the most efficient. you want them slender and long, extending past the thrusting end of the bottle. for width, i made mine 30 degrees from straight down, 6 inches long, and tapered. and it worked fairly well. instead of a launch tube, i used a guide rod. i got a pair of four foot steel rods that were thin but strong. on the sides of the bottle i taped straws.
here is a good picture for an example of fins. also has good info about center of mass and stuff
good luck
-jd
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