v squareds:
I think it fits the formula reasonably well: the heavier weight needs 177kt while the lighter needs 110kt. If you square each of these speeds & then divide the bigger result by the smaller result
(177 x 177)/(110X110)
you get 2.59 which is more than double (is that the point of your question?)
But I guess there are a host of other technical complexities coming into play, what with the rotational momentum of the plane, varying ground effects, varying engine performances etc etc
By this reasoning, you actually only need about 156kt to double the lift from 110kt (is that what boac was alluding to?)