Over in the Recommended Downloads section, you might notice a new program called 2DZAP.  This is a missile trajectory simulator designed by Andrew Pavacic intended for pointing out significant errors in trajectory modeling and flight physics in flight simulators and the like.  It's an amusing program, and Andrew's upcoming AIAA article on the simulator demonstrates how he is able to get the same results as those published by NASA for various missiles, validating the effort he put into its design. Download it, check it out, and be on the lookout for the AIAA article!Authored by Sean O'Connor Visit geimint.blogspot.com for the article in its entirety.