So, the simplistic factor is SQRT(1.5)=1.22.
So, are you saying that one could reasonably expect a margin of safety of 1.22*Vd, at ultimate G loading of 1.5 x limit load?
In other words, if one were flying a Utility Category aircraft with a Vne of 180 knots (.9 of Vd), a Vd of 200 knots, the pilot could expect to be safe at 244 knots (1.22*Vd) pulling 6.6 G's (1.5 * limit load)?