![]() Here is an example of how it could be done. Obtaining such data is the most difficult part. Also note that in the beginning the mass change is not linear thanks to the initial spike in its thrust curve.Īs I said above I can't see why OR can't be use to model a water rocket providing one knows the rocket thrust curve. As you can see the between the motor ignition and its burnout the rocket mass changes by about 11g, which is the difference between the Launch mass and the Empty mass of the motor in Fig1. To exaggerate the effect I've deliberately changed mass of some parts to 0. You'll see something similar to the attached Fig2. In Y axis type select Mass in on of the drop down menus. Now, go to Flight Simulation, select Simulation 4, corresponding to C6-6 motor, and run it. As far as I remember another tool, commercially available RockSim, may use it. rse motor file, information about propellent mass is explicitly stated. I think, but I'm not sure at the moment, that in the. ![]() Information about to masses is in the header of a thrust curve file. The thrust of a motor is directly proportional to the velocity of the escaping gas and the mass per time unit that is exhausted.Thus, knowing the thrust curve and the propellent mass, it calculates a proportion of the mass exhauster at a particular time. The program doesn't care what propellent is used. The difference between the two is the mass of the propellent. ![]() On the right hand side there are Launch mass and Empty mass of the motor. One of the motor configuration used called C6-5. Open the one called "a simple model rocket". And another one for a little tool helping with the thrust file creation: Since the program simulates pyro motors, is there a way to program it to simulate the weight of the water and how it goes away as the rocket thrusts?įirst of all here are more accurate links explaining details about thrust curve files. You seem to have a good handle on the program, so I was wondering if you could answer a question for me. It is possible to add your own trust curves to the list of motors. The Sky Dart wrote:There is one way to simulate a water rocket without waiting for any further development. There are many aspects that, if taken care of, can significantly improve performance. I suppose there may be other more accurate ways to obtain the required data. and reverse calculated thrust from acceleration curves. Now, the main question is how to calculate the thrust curve you want to model. Let me know if more instructions are needed. eng file can be just dragged and dropped back into. Alternately I suggest you just compare what OR shows and context of the corresponding file. Elsewhere on there is a description of both formats, but basically it's just a list of time-thrust values with some additional information in the first row, such as a motor weight, delay etc. Both can be viewed in a text editor.eng format is easier to work with and I usually use it if I want a custom made thrust curve. For some motors there may be a couple of different files in different format. There you'll see files representing motors available in OR. jar file through WinZip or something similar. There is one way to simulate a water rocket without waiting for any further development.
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