made of

[GoldfishLord]

The vertical rudder is to keep the machine headed into the wind and is not movable. This rudder is made of cloth stretched over a light wooden frame, which is nailed to the rudder sticks connecting to the main frame.

Source: https://byrongliding.com/articles/how-to-make-a-glider/

This belt is made of cloth, and it's nice and easy to take off. If this didn't already belong to me, I'd want to buy three!

Source: https://www.depop.com/products/happypappy-this-belt-is-made-of/

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It would seem to me that there is a slight difference in meaning between "of" and "of".
"Of" refers to the structure of the rudder, but "of" refers to just the material of the belt.

Is there a slight difference in meaning between "of" and "of"?

 

[tedmc]

"Of" refers to the structure of the rudder, but "of" refers to just the material of the belt.

How can" the structure" of the rudder be stretched?

 

[GoldfishLord]

"Cloth stretched over a light wooden frame" is the rudder, not the material used to make the rudder.

 

[emsr2d2]

I can't see this difference you're talking about.

This rudder is made of cloth ...
This belt is made of cloth ...

The meaning of "of" in "of cloth" is the same in those two examples.

 

[GoldfishLord]

This rudder is made of cloth stretched over a light wooden frame.

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I can't understand why the red part is used.
Any cloth could be used to make that rudder.
Is only cloth stretched over a light wooden frame used to make it?
We doesn't have to need only "cloth stretched over a light wooden frame" to make it.

 

[güey]

To demonstrate it's the same "of" in both cases, you may replace "stretched over" with "and":

The belt is made of cloth.
The rudder is made of cloth and a light wooden frame.