Quote:
Originally Posted by fireant911
…Off topic but interesting tidbit… in regards to Naval ships and boats, each ship and boat can be identified by their unique propeller noise by the enemy. To aid in hiding this ‘propeller signature’, hundreds of small holes exist on the leading edge of the propeller blade whereby air is ejected that aid in camouflaging this noise. I have no idea of how these holes are cast into the part as machining them in after the casting is produced seems impossible.
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In addition to how they get the holes in the blades, I’m wondering how they get air to the blades. I can only imagine there’s a compressor inside the ship, air is pumped through the shaft and distributed to the blade, somehow…