CHAPTER VI.

THE QUESTION OF SUSTENTATION. THE CENTRE OF PRESSURE.

§ 1. The centre of pressure--Automatic stability. § 2. Oscillations. § 3. Arched surfaces and movements of the centre of pressure--Reversal. § 4. The centre of gravity and the centre of pressure. § 5. Camber. § 6. Dipping front edge--Camber--The angle of incidence and camber--Attitude of the Wright machine. § 7. The most efficient form of camber. § 8. The instability of a deeply cambered surface. § 9. Aspect ratio. § 10. Constant or varying camber. § 11. Centre of pressure on arched surfaces 78