One chap pointed out that the houses on the ground are anchored to a foundation and that the aircraft are not.
I was the chap, but you didn't get my point correctly: the fact is the sideways vector of the little "tornado" will hit the houses at a 90° angle, because they are stationary, not because they are anchored to the ground.
When it comes to and object moving rapidly, the sideways vector has to be combined with the forward vector (the speed of the airplane vector), thus the resultant force vector will hit the object at a very low angle, around 10-20° roughly in this case, not 90° degrees anymore.
Thus the force of the "tornado" will have little effect on the lateral walls of the house...
I'm glad you insist with your theories, it gives me the opportunity to improve my english grammar...
