Im quite surprised that none of you know what Im talking about. Perhaps due to different avionic systems. But then let me ask you this: how do you know whats your 1.3 or 1.23 vs so called Vref during cruise ? After all you have not yet set up landing speeds yet. In CJ Vref is represented by green donut computed by computer and displayed entire time from start to land. V2 is taken from charts and is fixed. And when during takeoff Vref rises above V2 I assume Vref as minimum speed to fly and no longer V2. I think this might be CJ thing only so will adress this somewhere else. Ether way thank you for your answers !