Chapter C: V. Obst tractor Opp. 82

Model Warplane 84

Simple compressed air engine (Diagram 16) 87

Schober compressed air driven monoplane Opp. 90

Schober compressed air driven biplane Opp. 90

Dart compressed air driven model 95

John McMahon and compressed air driven monoplane Opp. 98

Frank Schober preparing model for flight Opp. 98

John McMahon pusher biplane (Diagram 17) 102

Wise compressed air engine Opp. 104

Schober-Funk three-cylinder rotary engine Opp. 105

Schober four cylinder engine (Diagram 18) 107

Jopson gasoline engine Opp. 110

Sectional view of Jopson engine (Diagram 19) 112

Power curve of Jopson engine (Diagram 20) 115

Midget gasoline engine Opp. 116

English steam power plant Opp. 120