John and I wrote these simulators to help skydivers understand what is happening in the air and how to be safe. If you have any comments about this site, feel free to email me at poijuggler (at) gmail (dot) com.
In the "World" view, click and drag to view the scene from different angles. Click on "Reset View" to return to the default viewing angle. Click on "Run Simulation" to reset the simulation and run it again.
Click on "Show Instruments" to view the controls. Here, you can adjust the fallrates of the two groups of skydivers, the separation between exits, and the speeds of the winds at different altitudes and of the airplane. For example, you can switch the freefall speeds of the two groups and see what happens when freeflyers exit before RW groups. For more details on these adjustments, read the technical information page. Click on the "Run" button at the bottom to return to the world view.
Scroll down to the bottom of this web page to see the results of the simulation.
A horizontal separation value of zero indicates a potential for collision on opening. For better safety with today's fast parachutes, the horizontal separation when the simulation ends should be at least 300 feet.