Category Archives: Power Tech 10

Principles of Flight

Bernoulli’s Principle is a principle of flight. This post will help you understand this better.

This principle is used to help explain how heavy objects that are heavier then air can fly.  just imagine a plane.. The shape of it is in the diagram below. Faster moving air has a low air pressure while slower moving are has higher pressure. Since on the pressure is greater it will push up air particles making your plane fly.

In this picture here shows shorter the distance higher the pressure which gives lift.

This video shows me using the tumble gliders in action.

Part 1 (Paper Rockets)

1. Draw a path of trajectory of your rocket (In the video below)   (Rocket attempt distance)  (Rocket attempt 1)  (Rocket attempt 2)

2. Which force is acting on the rocket at the moment of launch? (use arrows to indicate direction)

At the start the force of the psi pressure on the pump is pushing up the rocket. But the rocket slowly looses the upward momentum because gravity is slowly stopping it pushing it down.

3. As the rocket was half-way up, which force(s) is/are acting on the rocket? (use arrows)

When the rocket was halfway up the force that was acting on the rocket was the gravity. Gravity pushes things down towards the surface |  |  |                                                                                                                                                                                                                                                      v v v

4. As the rocket begins to veer into another direction, which force is acting on the rocket? Explain why this is happening.

The weight is what makes it go in a different direction. If its not even it will do towards the heavier side.

5. Did some rockets work better than others? How does the shape of the nose and fin effect the trajectory of the rocket? Explain in terms of the four forces that act on a rocket ship.

Yes some of the rockets did work better then others. The shape of the nose and fins do matter. The nose needs to be very sharp looking because this will help the rocket cut through the air. The fins need to be slim and sharp because it will also cut through the air giving it more lift. The 4 forces are the beginning lift which pushes the rocket.  Then gliding thorough the air with the fins helping keeping it in the air longer with Bernoulli’s Principle. Longer distance lower pressure and shorter distance higher pressure. This pushes up the rocket. Gravity is also 1 of the 4 forces. Gravity pushes the rocket down.

Part 2 (Bottle Rockets)

  1. What have you learned about the history of rockets and space travel? Write a summary on the blog about something or someone you found interesting and tell why.

Something that I found interesting was the fact that the Chinese used fire arrows. It was very useful because will the fire propellent it makes the arrow go further usual

2. Now that you know about the basic parts of a rocket and what they do, write about each part and its importance in your own words. What will be different on your water rocket than on a “real” rocket and why?

The Top nose cone is important because it is used to cover the top. Depending on the shape will cause it to have drag or not. Blunt objects will have the most drag while the parabola will give the least amount of drag. The payload is the part where the most important or the main thing that you bring to space. Next is the fuel tank and the oxidizer. These are the components used to help move in space. This is part where the fuel is spewed out. And the oxidizer is the part which takes place of the oxygen and makes an explosion. Which will make the thing move. The fins are the part that is used to keep the keep the ship to go straight and not rock back and fourth. The different will be the fact that we will use pressure and water and not gas fuel and an oxidizer tank. It also won’t go as far as going to space. Also, this is going to be to save an egg.

3. Write a little on the blog about how to find the Center of Pressure and the Center of Gravity on your rocket and why they are important.

To find the center of pressure cut out your rocket on a piece of cardboard. Find a thin piece of anything and why you best to center it. Once it balanced out is where the center of pressure is.

To find the center of gravity you need to get your cardboard cut-out. Once you have your cut-out attach a string to it. The rocket piece should be level and not high or lower on the other side.

4. Based on what you have learned about rocket design (nose cone & fins) describe what your rocket will look like and why you chose that design on the blog.

My rocket will be a 2 rocket. With a parabola cover. With 4 fins to help with stability as much a possible. It should be middle regular height. I will make sure I can fit a parachute in it to save the egg that is going to be in the rocket. (Aka the payload)

Part 3 (Bottle Rocket after launch)

1. How did the height you estimated your rocket would reach compare with the actual estimated height?

The height I estimated was a lot. I mean A LOT higher then it went. It was way lower then I though it would be.

2. What do you think might have caused any differences in the height you achieved?

The difference in the was because my top piece blew off during launch. The force was a bit to much and the tape blew off.

3. Did your rocket launch straight up? If not, why do you think it veered off course?

My rocket did go up straight. Had the good center of gravity so it would not go off course.

4. Do you think that this activity was more rewarding to do alone? Would you have preferred to do it in groups? Why or why not?

It was more rewarding to do it alone because you can make it the way that you want so in that way it felt more rewarding.

5. Did you adjust your model rocket at all? How? Do you think this helped or hindered your results?

Once I made the draft I did not change the design. I felt like if I changed the design it would be messed up and fail.

6. How do you think the rocket would have behaved differently if it were launched in a weightless atmosphere?

If it was launched in a weightless atmosphere it would just go up forever.

7. What safety measures do you think engineers consider when launching a real rocket? Consider the location of most launch sites as part of your answer.

That its safe area that won’t start wild fires. If it’s to light that it would explode also many different things that will make sure that it will go straight etc.

8. When engineers are designing a rocket which will carry people in addition to cargo, how do you think the rocket will change in terms of structural design, functionality, and features?

It would change because you need to be able to other things in the rocket. They might change the structure by making it longer to fit more things or maybe just doing other adjustments to be able to fit everything.

9. Do you think rocket designs will change a great deal over the next ten years? How?

How I think rockets are going to change in the future years is by making things to conserve them. Like saving the rocket so it can be used in future.

10. What trade-offs do engineers have to make when considering the space/weight of fuel vs. the weight of cargo?

They would have to add more fuel in order to have enough boost to get it to space. because if it doesn’t it would fail and come crashing down. Many trade-offs are in this situation. Less food (weight would mean less fuel to boost up.


Rube Goldberg Machine

After HOURS of TESTING and many many failures. We have finally have finished our Rube Goldberg Machine!

In these videos I present our Rube Goldberg Machine!!!

In this first video is the explaining on how each part of the machine works

In this second video is our Rube Goldberg machine in action