CHAPTER 1. The aircraft problem 235
2. Airplane production 239 3. The Liberty engine 265 4. Other airplane engines 281 5. Aviation equipment and armament 294 6. The airplane radio telephone 323 7. Balloons 331
2. Airplane production 239 3. The Liberty engine 265 4. Other airplane engines 281 5. Aviation equipment and armament 294 6. The airplane radio telephone 323 7. Balloons 331