Bookworm.. .. .I don't think that is overkill. Consider that whilst most flight is at relatively shallow gradients, when stalling is intended it is either for primary training or more exotic manoeuvres (aeros or ACM). In the latter cases the flight path is quite possibly more vertical, so any model ought to reflect that.. .. .As an aside, the purist could argue that since straight and level flight is not actually a state of uniform motion in Newtons terms, that L <> W even in level flight.... .. .CPB