CHAPTER IX.

THE STEERING OF THE MODEL.

§ 1. A problem of great difficulty--Effects of propeller torque. § 2. How obviated. § 3. The two-propeller solution--The reason why it is only a partial success. § 4. The _speed_ solution. § 5. Vertical fins. § 6. Balancing tips or ailerons. § 7. Weighting. § 8. By means of transversely canting the elevator. § 9. The necessity for some form of "keel" 105