KVASS
Simulation and Planning Time without any restriction.
Simulation
Use the Simulation button for a launch, and alongside the cost of the vessel, you will need to pay additional funds for the simulation.
After you finish your testing, use the "Revert to Editor" option as usual. This will return the vessel's cost, but the additional payment will not be reverted (default - 2% of the vessel's cost).
Do not forget to enable the possibility to revert in the stock s