Out-of-phase multi-variable suspension full-motion flapping wing aircraft

Abstract

The invention discloses an out-of-phase multi-variable suspension full-motion flapping wing aircraft. The aircraft is suitable for medium and small flapping wing aircrafts and is especially suitable for human-powered aircrafts and power efficiency priority or low noise drones. Several flapping wings integrally moving can periodically move up and down with equal phase differences. The wing that moves downwards under the driving of the length variable suspension device bears and keeps the elevation angle provided by pitching control and can get a forward component force in down sliding motion (wherein the load height is kept because of reduction of suspension length). The downwardly moving wing is driven by the traction cable so that the wing moving opposite to the downwardly moving wing raises and thus height is recovered. The upwardly moving wing does not bear and the positive elevation angle is not limited. Under the action of air flows, the wing is lifted at almost zero elevation angle so that the negative lifting force produced by the positive elevation angle and the negative attack angle is avoided, and lifting force backward tilting produced by the positive elevation angle andnegative attack angle is avoided without moving time compensation of a single-layer flapping wing so that the load turbulence is reduced and the energy waste is avoided. The pitch control is not periodically changed along with the flapping wing so that the difficulty of motion coordination is observably reduced and the ability to adapt to different speeds and different pitch angles is improved.

Description

technical field [0001] The invention relates to an out-of-phase multiple-variable-suspension full-motion flapping-wing aircraft and a flight method thereof, which are suitable for medium and small-sized flapping-wing aircraft, and are especially suitable for human-powered aircraft and unmanned aerial vehicles with priority in power efficiency or low noise. Background technique [0002] The present invention is based on following theoretical recognition: [0003] In the cruise flight of large birds, the vertical flapping is less than one meter and they have to advance several meters. Therefore, the downward flapping can only be a negative elevation angle and a small angle of attack. Otherwise, the increased induced resistance and the energy consumption of body bumps are not worth the candle anyway. [0004] The basic principle of cruising and flapping wing flight is to load the wing and increase the acceleration of the descent by using the load to move upward and vertically ...

AI Technical Summary

Problems solved by technology

However, in the mechanism of angular movement and passive torsion (without active elevation control), the main principle of the flapping wing is far from being fully reflected. Although this double reverse flapping wing reduces the load turbulence, a large number of forces cancel each other , reducing power efficiency

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