Why Saab 2000? Is this a performance question or a type specific question. The V speeds relate to weight, temperature, QNH, Take Off Run Available, Accelerate Stop Distance Available, Obstacle clearance up to 1500 ft above airfield, VMcg, VMBE. In the case of the Saab it is an exceptionally well performing turbo prop (performs better with one engine out than lots of other turbo props with all engines operating) and you will find that all but exceptional airports you will find the performance is only limited by the Airframe limitations (Max Take Off Mass) and balanced field ie v1vr are the same. You will be able to carry out reduced power takeoffs pretty much everywhere up to 43C in most cases for MTOM. The V1 VR if taken from the performance book for Max Take Off Mass is normally 121kts. Taken from easterns own little speed book Vr varies between 116 to 118kts depending on weight. Why do you ask? There is a fair bit of info on
www.saabaircraft.com