If my catalogue is right, all three turnout sizes have common track spacing and departure angles. If that is correct then they cannot have a constant radius throughout. The 2' radius turnout has only a short section of curve through the points and a nearly straight departure beyond that on the curved leg. The medium turnout has a more constant curve. The large radius turnout has a relatively gentle curve from point until near the frog and then a tighter curve to match the departure angle.