FS2004/FSX Boeing 737 V-Speed Calculator. This Ruperts Software program is designed to calculate the V-speeds (V1, VR, V2) of the Boeing 737-700/800/900 for people who don't have an FMC in their 737. The program is a standalone program so you will either have to run it on a separate PC, minimize FSX or plan it before you start your flight. The only information you need to know is your takeoff weight (payload), and your desired Flap setting. By Rupert Smith.