![]() ![]() Hence, some degree of attention to optimizing fin area for stability is also beneficial to performance. But bigger fins are also likely to cause additional drag and weight that can work against achieving the highest possible apogees. Any time turbulence begins to cause a stable rocket to rotate and veer off its direction of flight, the fins will develop lift forces - because of the angle of attack they acquire relative to the airflow - that will act to clock the aft end of the rocket back about the rocket's Center of Gravity until the nose and fins are realigned with the direction of air flow again.Īdditionally, in general, the bigger the fins are in the back of the rocket, the more likely the rocket is to remain stable. Such an arrangement is stable because the fins are behind the center of rotation, much as they are on a weather vane, where their actions will force the rocket to stay pointed into the direction of air flow. This usually requires that more of the rocket's mass is concentrated at the front end of the rocket, while the fins are positioned as far aft as possible to maximize their effectiveness as a stabilizing device. That the Center of Gravity (CG) remains above the Center of Pressure (CP) to keep the rocket stable in flight. While the Center of Pressure (CP) is an averaged point of action for fin and body aerodynamic lift - a location on the rocket where the summation of all the forces of pressure that develop can be assumed to be acting from. The Center of Mass (CM), also called Center of Gravity (CG), is the central point of balance and rotation for the rocket, Hence, the degree of stability any given rocket has is a very important performance factor.įor the typical free flight rocket, the degree of stability inherent in its design is largely dependent on the relative position of the rocket's Center of Mass (CM) to its Center of Pressure (CP). ![]() This is because, the more stable the rocket is, the less the rocket wastes energy wobbling about and/or going sideways off course. Stable rockets are more efficient and obtain higher apogees. If you have any problems or suggestions please get back to us. In the future look for us to make even more enhancements. Get the App for free here (click on icon): Software is also available for iPads and macOS desktops as an (iOS) App in the Apple App Store,Īnd for Chromebook/Android devices in the Google Play Store. v3.4 Windows 7 or later (1.2 Mb) - Zip File.v3.4 Linux (1.3 Mb beta version) - Zip File.v3.4 MacOS 64bit (9.2 Mb) - Zip File (need to finder approve).v3.4 Mac using OSX.3 to OSX.12 (3.8 Mb Uni) - Zip File.There is no installation, simply expand the archive and double click on the program file to run it. Select the Water Rocket Fun software file that you can use below and download it to your hard drive. This is the latest release of Water Rocket Fun (Ver 3.4). ![]() Rated 5 out of 5 cows shareware by Tucows The methodology includes both incompressible and compressible fluid mechanics along with a fair amount of thermodynamics and numerical methods to provide accurate water rocket apogee predictions.Ĭheck out the excellent correlation between simulation and sophisticated high speed digital camera results below (see graphs) Under the hood this program is pretty sophisticated and thorough. But don't be fooled by the program's simple layout, few if any of the other simulators you may find are as accurate. The interface is designed to be easy to use and understand. This program can help students and rocketeers understand the physics of water rockets and how to optimize their water rocket launches to obtain the highest apogees. (software extensively reworked and enhanced by Seeds Software July 99, July 00, June 01, Feb 02, Nov 02) Water Rocket Fun A Water Rocket Simulator for Fun & Science Studies Software for Fun and Education Additional Science Software ![]()
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