2d1c843bfb
This patch is based off a thread from "The Rocketry Forum" ( http://www.rocketryforum.com/showthread.php?70475-Problems-with-custom-motors-in-OpenRocket ) . Complaint: Poster had a water-rocket engine file which would raise IOExceptions upon automatic load. (1) the original .rse motor file, posted in the thread above, has an invalid motor length. (2) The corrected .rse file follows at the end of this commit message. Bug: The mass auto-scaling code would over-estimate the mass loss, and declare a negative mass upon motor exhaustion. The negative mass is small (in this case, ~= -1E-16). However, this error is larger than the single-precision epsilon. Fix: Added a loop which checked for negative mass during the thrust curve, and reset those values back to zero. (AbstractMotorLoader.java:105) Also, expanded the number and detail level of some related exception reporting. (ThrustCurveMotor:137) ---- <engine-database> <engine-list> <engine mfg="Water" code="W90psi" Type="single-use" dia="18.001" len="200." initWt="800." propWt="800." delays="1000" auto-calc-mass="1" auto-calc-cg="0" avgThrust="280.059" peakThrust="428.329" throatDia="0." exitDia="0." Itot="21.284" burn-time="0.08" massFrac="99.88" Isp="2.71" tDiv="10" tStep="-1." tFix="1" FDiv="10" FStep="-1." FFix="1" mDiv="10" mStep="-1." mFix="1" cgDiv="10" cgStep="-1." cgFix="1"> <comments>Water Rocket, 90 psi, 800g</comments> <data> <eng-data t="0." f="0." m="800." cg="81.6327"/> <eng-data t="0.001" f="428.329" m="791.95" cg="89.1566"/> <eng-data t="0.005" f="405.382" m="729.279" cg="107.229"/> <eng-data t="0.008" f="383.711" m="684.79" cg="115.663"/> <eng-data t="0.016" f="346.742" m="574.971" cg="132.53"/> <eng-data t="0.023" f="319.972" m="487.264" cg="142.169"/> <eng-data t="0.031" f="294.476" m="394.885" cg="154.217"/> <eng-data t="0.041" f="267.705" m="289.234" cg="163.855"/> <eng-data t="0.051" f="244.759" m="192.927" cg="172.289"/> <eng-data t="0.059" f="229.462" m="121.63" cg="178.313"/> <eng-data t="0.067" f="215.439" m="54.742" cg="186.747"/> <eng-data t="0.072" f="203.966" m="15.3326" cg="189.157"/> <eng-data t="0.076" f="0." m="0." cg="192.857"/> </data> </engine> </engine-list> </engine-database>
OpenRocket
Build Status - 
Overview
OpenRocket is a free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them.
The main features include:
- Six-degree-of-freedom flight simulation
- Automatic design optimization
- Realtime simulated altitude, velocity and acceleration display
- Staging and clustering support
- Cross-platform (Java-based)
Read more about it on the OpenRocket Wiki.
License
OpenRocket is an Open Source project licensed under the GNU GPL. This means that the software is free to use for whatever purposes, and the source code is also available for studying and extending.
Contributing
OpenRocket needs help to become even better. Implementing features, writing documentation and creating example designs are just a few ways of helping. If you are interested in helping make OpenRocket the best rocket simulator out there, please click here for information on how to get involved!