SOARING FLIGHT BY MAN
Flying machines have been classified as follows:—
Lighter than Air
- Fixed balloon,
- Drifting balloon,
- Sailing balloon,
- Dirigible balloon
- rigid (Zeppelin),
- ballonetted.
Heavier than Air
- Orthopter,
- Helicopter,
- Aeroplane
- monoplane,
- multiplane.
We will fall in with the present current of popular interest and consider the aeroplane—that mechanical grasshopper—first.