anybody know how to calculate v1 vr v2 base on the temperature and the weight ? and the flap seting for landing base on the weight too !Please help.

V1/Vr/V2 speeds are usually found in the aircraft manuals performance section for takeoff. Numbers for different flap settings and weights along with variables for temperature and pressure are found here also. The problem is these arent available for the aircraft in FS. In order to calculate them you need access to these tables. Flap settings for landings are usually standard, most aircraft using all available flaps for landing. Sometimes gusty winds dictate a lesser flap setting but that is generated by airlines as SOP or by flight departments as they see fit. Most big airplanes use all flaps for every landing. This is usaully 30-40 degrees of flap.Hornit