N5296s. The real figure is higher, but Robinsons have to set a conservative figure for liability reasons. The problem is that that the ASI readings are unreliable at low speeds and the VSI suffers from large lags. From a practical point of view, all you can say is that you won't get VRS at 30kt/300fpm, but under certain conditions of sudden changes of flight path it is POSSBLE to get it at lower air speeds and higher rates of descent.