Tetra-propeller aircraft

1. A vertical take-off and landing aircraft comprising:

an upper enclosure comprising a first upper arm and a second upper arm;

a lower enclosure comprising a first lower arm and a second lower arm;

wherein the first upper arm and the first lower arm comprise a first upper buckle and a first lower buckle, respectively;

wherein the second upper arm and the second lower arm comprise a second upper buckle and a second lower buckle, respectively;

wherein the first upper buckle engages the first lower buckle and the second upper buckle engages the second lower buckle, thereby securing the upper enclosure to the lower enclosure;

wherein at least one of the first upper buckle and the second upper buckle comprises a slot and a recess; wherein at least one of the first lower buckle and the second lower buckle comprises a protrusion and a step; wherein the protrusion engages the slot and the stop engages the recess.

2. The vertical take-off and landing aircraft of claim 1 , wherein the lower enclosure comprises a battery holder configured to removably secure a battery on the lower enclosure.

3. The vertical take-off and landing aircraft of claim 1 , wherein the upper enclosure comprises a pocket at each end portion of the first upper arm and the second upper arm, the pocket being configured to accommodate one or more motors therein.

4. The vertical take-off and landing aircraft of claim 1 , further comprising a PCB board configured to receive signals from a satellite or a remote controller; transmit signal to satellite, remote receiver; control location, speed, heading and trajectory of the vertical take-off and landing aircraft; process image data; drive motors; or a combination thereof.

5. The vertical take-off and landing aircraft of claim 4 , wherein the PCB board is attached to the upper enclosure.

6. The vertical take-off and landing aircraft of claim 1 , further comprising a solar panel.

7. The vertical take-off and landing aircraft of claim 1 , further comprising two first motors mounted on the first upper arm and two second motors mounted on the second upper arm.

8. The vertical take-off and landing aircraft of claim 7 , wherein the two first motors are configured to rotate clockwise and the two second motors are configured to rotate counterclockwise; or wherein the two first motors are configured to rotate counterclockwise and the two second motors are configured to rotate clockwise.

9. The vertical take-off and landing aircraft of claim 8 , further comprising a propeller mounted on each of the first motors and each of the second motors.

10. The vertical take-off and landing aircraft of claim 9 , wherein the propellers mounted on each of the first motors are mirror image of the propellers mounted on each of the second motors.

11. The vertical take-off and landing aircraft of claim 9 , wherein the propellers produce lift when rotating.

12. The vertical take-off and landing aircraft of claim 7 , wherein axes of the first motors and the second motors are parallel to each other and are located on a same cylindrical surface.

13. The vertical take-off and landing aircraft of claim 1 , further comprising a battery.

14. The vertical take-off and landing aircraft of claim 13 , wherein the battery is a rechargeable lithium-ion battery.

15. The vertical take-off and landing aircraft of claim 13 , wherein the battery is configured to be removably inserted into the vertical take-off and landing aircraft from a side thereof.

16. The vertical take-off and landing aircraft of claim 13 , wherein the lower enclosure further comprises one or more ribs configured to prevent accidental release of the battery from the vertical take-off and landing aircraft.