We want to show you the arrangement of a boat propeller which can change its angle of attack.
Brass would be a terrible mistake. Props are made from naval bronze.
These things are neat. With the right kind of variable pitch prop you can reverse the ship without having to change the direction of the engines’ rotation. I have worked with such systems on tug boats and they make engine rooms a lot simpler and sturdier by simplifying the transmissions and reduction gear.
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