Question

How do you make a model rocket

Answer 1

Explanation:

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Answer 2

Answer:

Step 1: Materials and Tools

This is all you will need:

Tools:

Pencil/Marker (something to mark with)

Ruler

Scissors

Compass

Sharp knife (I used an X-Acto knife)

Glue brush (shown in Step 5)

hot glue gun

needle-nose pliers

Computer with internet access

To launch your rocket:

launch pad/rod

ignition circuit

Materials:

2 x Manila Folders, letter-size (or more if you mess up)

Scotch tape

Duct tape (for structural integrity and, erm... progressive design enhancement)

Rocket engines (although I bought Estes A8-3 engines I would recommend getting something stronger, like a B- or C-class)

Step 2: Designing Your Rocket

First, go to this site. This Java applet was developed by NASA and is the simplest tool to use in designing a rocket. In order to use the modeler software, you'll need to download the applet. Scroll the page down a little bit and there should be a yellow button reading "Download Applet" on the left hand side. This will link you to this page. Next, following the instructions on the page, download the .zip folder. Find the .zip folder in your files and unzip the folder. When you return to the first page, the RocketModeler applet should be able to run in your browser.

You may need to change some security settings to allow the applet to run, and if you are having trouble the site will also walk you through this. I used RocketModeler III 1.2h, but there are other versions available. If you are having problems getting the applet to work on your system you can try using the previous versions.

Once you have RocketModeler up and running, you need to first select the "Solid" fuel option at the top right hand corner of the applet. Then, go ahead and start playing with settings in order to see how different parameters change the performance of the rocket. You can toggle through the Design, Fuel, Pad, and Launch pages using the buttons in the middle of the window. On the Design page, you can switch through the menus for the various components using the tabs at the top of the rocket schematic in the top left. The settings I used can be seen in the images. I changed the length of the nose to 4 inches, and changed the thickness of the cone to 1/16 inch cardboard to match the double-manila layering of the rocket cone. I then changed the recovery system to a 1 ft parachute. On the Body tab, (I left the payload alone), I changed the material to 1/64 manila, and increased the length to 17.5 inches. Finally, on the Fins tab i changed the material to 1/64 manila, the locate in to 0, the length to 4 inches, the L.E. angle (leading edge) to 60 degrees, and the T.E. angle (trailing edge) to 0. The width of the fins automatically snapped to 2.309 in, given the parameters.

Hit the "GO" button in the middle of the page, then switch to the fuel page. Thinking I would be using a larger engine, I chose a C6-7 engine. Hit "GO" for the fuel page, and the same for the "Pad" page. On the "Launch" page, hit "Fire", and the animation of your rocket's launch will play. The applet will then supply you with the theoretical height and speed graphs that your rocket would produce. You can go back and play with the settings until you reach your desired height. Just make sure to go back through each of the Design, Fuel, and Pad pages and hit "GO". For some reason the applet won't allow you launch your rocket unless you do this before each launch.

Once you have finished your design, you can mark down the dimensions of your rocket and move on to build your rocket.

Step 3: A Note on Rocket Design...

In designing your rocket, you want the Center of Pressure to be positioned below the Center of Gravity. The higher above the CP the CG is positioned, the more stable and straighter your rocket will fly.

What are these centers? The Center of Gravity is simply the center of mass of your rocket. This is the point that the rocket rotates about in flight. The Center of Pressure is the point through which the effect of drag and other wind forces affects your rocket. It's the center of the surface area of the rocket and is traditionally found by taking a cardboard cut-out of the cross-section of your rocket and finding the balance point. You can see in the diagram that if the CP is positioned above the CG, the force of drag and the wind will be able to change the flight path of the rocket by a large degree. If the CP is below the CG, the effect of drag and the wind act as stabilizing forces, helping your rocket to fly straight. By taking these points into consideration, you can design a rocket that will be stable in all conditions.

I ended up under-designing my rocket, which is why I don't recommend that you use my design. I overestimated the scale of the schematic and thought that my Center of Gravity was much farther from the Center of Pressure then it really was. In the end I had to compensate with duct tape to relocate the Center of Gravity. Spend a bit more time designing your rocket than I did!

Enough of that - let's get to building!