Nov. 08, 2021
There has always been a saying in the arena: When installing a propeller on
an airplane, the side with the words is facing the direction of the
With the changes in market demand, many propellers are now customized or specially developed, and the Logo and other marks on the propellers have been removed, so the propellers are smooth and without any words.
So, how do we install the propellers without words?
How does the wing generate lift?
Speaking of propellers, we have to talk about the wings first. Because the propeller is essentially a wing, the "lift" is generated by the rotation of the wing.
You can see its cross-sectional shape from the outer end of the wing. This is also called the "airfoil".
Motor and Propeller Test Kit
The principle of lift generation can be briefly described as follows:
Due to the different airflow speeds on the upper and lower surfaces of the wing, different pressures and pressures are generated, and finally lift is generated.
In order to make the air flow on the upper surface of the wing faster, the upper surface of the wing is often more "convex" than the lower surface.
In order to reduce flight resistance, the thicker end of the wing faces forward (leading edge) and the thinner end is rearward (rearing edge).
So now we can conclude:
The convex side (upper surface) of the wing is the side in which the lift is generated;
The thicker end (leading edge) of the wing is the end of the wing (aircraft) in the forward direction.
How does the propeller generate thrust/pull force?
Let's take the CW-20 Dapeng UAV as an example to see what the propeller looks like.
From the picture we can see that the cross-sectional shape of the propeller is very similar to that of the wing. As we said before, propellers are essentially wings.
And we can see that from the perspective of the lift generated by the "wing" and the forward direction, the lift generated by the "wing" is now the direction in which the propeller generates thrust/pull; the forward direction of the "wing" is the rotation of the propeller. direction.
How to install the propeller correctly?
After learning the above theory, for the installation of the propeller, we can conclude:
The convex side of the propeller is the direction in which the thrust/pull force is generated, and should be in the direction of the aircraft;
The thicker end of the propeller is the direction in which the propeller rotates.
Install the propeller according to the above two standards, and there will be no errors.
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