impossible to prevent a machine from coming
down, it can be prevented from overturning, and
this can be done without in the least detracting
from it structurally.

_Fig. 16. Reversing Motion._

The plan suggested has one great fault, however.
It will be impossible with such a structure
to cause it to fly upside down. It does not present
any means whereby dare-devil stunts can be performed
to edify the grandstand. In this respect
it is not in the same class with the present types.

THE STARTING MOVEMENT.--Examine this plan
from the position of starting, and see the advantages
it possesses. In these illustrations we
have used, for convenience only, the monoplane
type, and it is obvious that the same remarks apply
to the bi-plane.

Fig. 17 shows the starting position of the stock
monoplane, in position 1, while it is being initially
run over the ground, preparatory to launching.
Position 2 represents the negative angle at which
the tail is thrown, which movement depresses the
rear end of the frame and thus gives the supporting
planes the proper angle to raise the machine,
through a positive angle of incidence, of the plane.