| 摘要 |
The contra-rotative three-bladed propellors of 1.50 m diameter and with constant speed are positioned respectively in a cavity at the front of a tunnel in the shape of a pentagon. The engines are cylindrical each having a weight of 32 kg and a diameter of 0.35 m. They have the smallest weight/power ratio, viz. 0.250 kg/HP, the aviation standard ratio having a minimum of 0.5 kg/HP. Each contra-rotative propellor is centred in front of the entry of the pentagon. The speed of rotation of the blades causes a depression, the law of Daniel Bernouilli demonstrating that in a fluid flowing, the speed and pressure vary inversely. The double pentagons at the rear and the duck beak at the front (double lever arms) bring about an improved stability and a centering which is less exacting.
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