Planeless Flying Machines.

Progress, Volume VI, Issue 9, 1 July 1911, Page 722

Planeless Flying Machines.

• Notes on the Action of Gravity and the . . Force of Propulsion, /If the centre line of propulsion is directed at an angle of 30 degrees with the horizon (60 degrees to the vertical), taking gravity at 36 feet fall per second, a force of 32 feet per second will produce a resultant which is level, as shown by the diagram Pig. 1 on the well-known principle of the parallelogram of forces. It follows, therefore, that if we increase the propelling force (A Pig. 2) the gravity force (B) of course being constant, we lower the angle of propulsion as shown by

lb diagram, the resultant (C) as before ■being level. ■ To maintain a level line of flight,. therefore, we must employ the propelling force at the proper angle according with the -intensity of the force, otherwise the resultant will incline upward or downward as the ease - may , be. This is where the airman’s skill comes in, and only time and patience and experience will, bring this about.