The shape of the beehive is a strict hexagonal cylinder, with a flat hexagonal opening at one end and a closed hexagonal diamond bottom at the other end, which consists of three identical diamonds. The rhombic obtuse angle of the chassis is 109 degrees 28 minutes, and all acute angles are 70 degrees 32 minutes, which is both firm and material-saving. The honeycomb wall thickness is 0.073 mm, and the error is very small.
Why are all wheels round? The center of the circle is called the center of the circle, and the distance from any point on the circle to the center of the circle is equal, which is called the radius. Make the wheel round, and the axle is at the center of the circle. When the wheel rolls on the ground, the distance between the axle and the ground is always equal to the radius of the wheel. So people sitting in the car can be pulled away smoothly by the car. If the wheel is deformed and not round, and the distance from the wheel to the axle is not equal, the car will not be stable again.
Red-crowned cranes move in groups. Red-crowned cranes always move in groups, forming a "human" shape. The angle of the herringbone is 1 10 degrees. More accurate calculation also shows that half the angle of the herringbone-that is, the angle between each side and the direction of the crane group is 54 degrees, 44 minutes and 8 seconds! And the angle of diamond crystal is exactly 54 degrees, 44 minutes and 8 seconds!
Hand index The ten fingers of human beings are natural "counters". Primitive people did not wear shoes and socks, and with ten toes, the range of counting was wider. Up to now, some ethnic groups still use "hands" to represent "five" and "people" to represent "twenty". It is speculated that "decimal" is widely used, which is probably related to finger counting.
Fan blades are odd, because odd blade combination can bring more performance advantages than even blade combination. If the number of blades is even, forming a symmetrical arrangement, it is not only difficult to adjust the balance of the fan itself, but also easy to make the fan generate more * * * vibration at high speed, which will lead to the failure of the blades to bear the fatigue caused by * * * vibration for a long time, and finally lead to the occurrence of blade fracture and other situations. Therefore, the design of axial flow fan is mostly asymmetric odd blade design. The same design concept is also reflected in the design of daily electric fans or propeller helicopters. If the fan is a three-leaf structure, the blades are wider and the roots are stronger, and the density of each part needs to be uniform; If it is a five-leaf structure, the leaves are narrow and the thickness and strength are relatively low.