The applet will then supply you with the theoretical height and speed graphs that your rocket would produce. On the "Launch" page, hit "Fire", and the animation of your rocket's launch will play. Hit "GO" for the fuel page, and the same for the "Pad" page. Thinking I would be using a larger engine, I chose a C6-7 engine. Hit the "GO" button in the middle of the page, then switch to the fuel page. The width of the fins automatically snapped to 2.309 in, given the parameters. angle (leading edge) to 60 degrees, and the T.E. 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. 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. I then changed the recovery system to a 1 ft parachute. 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. The settings I used can be seen in the images. 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. You can toggle through the Design, Fuel, Pad, and Launch pages using the buttons in the middle of the window. Then, go ahead and start playing with settings in order to see how different parameters change the performance of the rocket. 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. If you are having problems getting the applet to work on your system you can try using the previous versions. I used RocketModeler III 1.2h, but there are other versions available. 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. When you return to the first page, the RocketModeler applet should be able to run in your browser. zip folder in your files and unzip the folder. Next, following the instructions on the page, download the. Scroll the page down a little bit and there should be a yellow button reading "Download Applet" on the left hand side. In order to use the modeler software, you'll need to download the applet. This Java applet was developed by NASA and is the simplest tool to use in designing a rocket.
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