PHASE 1: Research and Picking Motor TypePurpose: This section's main project was the rocket motor project. In which we get in groups of 2-3 to create a working rocket motor. We are testing out different types of fuels and burners, and each group chooses a little different combination of them. We are creating motors and later we will test the thrust. We will see which motor type is the most efficient for our final project: Scratch Rockets. We will compare the different outcomes of each group and we will see which combination of burner and fuel brought us the most thrust. Group Members: On this project I worked with Isabel and Sammie. ____________________________________________________________________________________________________ The Beforehand Research: We were required to choose a fuel and a motor engine. To pick something most efficient, we were required to do research on each of the options. Motor choice - END BURNER or CORE BURNER Fuel choice - BLACK POWDER or SUGAR CHOOSING THE RIGHT BURNER/FUEL/SIZE COMBINATION: Initially, the combination our group had in mind was Core Burner and Black Powder. Before conducting much research, we all thought of doing that combination. We thought that core burner was the more practical decision, and we thought that we wanted more of a higher shot of thrust instead of the end burner giving us just a constant level of thrust. Along with the core burner, we chose to do gun powder. After doing more research we saw that since the distance that the flame travels is short in a core burner (from the edge of the core to the inside of the casing wall), core burners have short burn times. Knowing that gun powder has a faster burning time than sugar, we realized then that we couldn't do a gun powder and core burner combination. After talking to Andrew we also later realized that our motor would blow up if we combined those two options. We chose to keep black powder because we wanted a faster burn rather than a long burn that sugar gives us. And so, instead of choosing core burner, we chose to do end burner. Regarding the size of 3/16ths, we chose to do a smaller motor than what everyone else was doing. Why core burner and gun powder are not suggested to work together? I learned that core burners have a smaller nozzle, and so fast burning fuel like black (gun) powder will not work well with that. So much energy will be released from the fast burning black powder, and that isn't good for a burner with a small exit way (nozzle) such as the core burner. All the energy at once cannot exit the motor fast enough, and so the motor is very vulnerable of exploding. So much energy will be released and will not exit fast enough, all the energy contained will just blow up the core burner. That is why we switched from core burner to end burner. We then drew our diagrams for our choices. PLEASE IGNORE THE CORE BURNER LABEL. After this we got our brown cardboard motor and got a name plate to write our group name and important information on it. Here is our FINAL INFORMATION:
Next post we will continue work on this project! We will be testing these motors out soon!
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December 2015
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