Does anyone know the mathimatical vspeed formula for determining V1/Vr/V2?

Nope... it's rather complex though. Which is why aircraft have tables with those values in them based on air temp, altitude and takeoff weight.However, here's the basic premise... and I do mean basic.V1=V2 * Sq Root (W1/W2) Where: V1=Target Airspeed V2=Published airspeed for a given weightW1=Weight for which airspeed is to be determinedW2=Gross weight for which airspeeds are published

And the same formula can also be used to scale Vr and Vref.Cheers,Glenn