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 - an Open Source model rocket simulator
--------------------------------------------------
Copyright (C) 2007-2013 Sampo Niskanen and others
For license information see the file LICENSE.TXT.
For more information see http://openrocket.sourceforge.net/
To start the software run the class
net.sf.openrocket.startup.Startup
or from the JAR file run
$ java -jar OpenRocket-<VERSION>.jar
Contributions have been made by:
--------------------------------
Sampo Niskanen, main developer
Doug Pedrick, support for RockSim designs, printing
Kevin Ruland, Android version
Bill Kuker, 3D visualization
Richard Graham, geodetic computations
Jason Blood, freeform fin set import
Boris du Reau, internationalization
Translations contributed by:
Tripoli France
Tripoli Spain
Stefan Lobas / ERIG
Mauro Biasutti
Sky Dart Team
Vladimir Beran
Polish Rocketry Society / Łukasz & Alex Kazanski