It looks like you have the source code (which is used to build OpenRocket) unzipped there, not the compiled jarfile.
You want OpenRocket-12.03.jar from the Sourceforge "Download now" link.
You may have opened the .jar file in an archive manager. Get the Java runtime and run the .jar with that.
2013 impulse burned: 5205.1 Ns
2013 impulse lined up to burn: ~56,445 Ns
Make sure you have the latest Java installed then just double-click the OpenRocket file.
Last edited by Tarasdad; 30th June 2012 at 01:37 AM. Reason: Stupid dang iPad "keyboard"
Estes - Big Bertha (1); Big Daddy (0); Vagabond (1); V2 (2); STM 012 (0); QCC Explorer (0)
Custom Rockets - Redliner (0)
Aerotech - IQSY Tomahawk (1)
Semroc - Hawk Boost Glider (0)
In the build pile
PemTech Screaming Green Meanie; K&S Super Flash