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Maybe some submarines had contra-rotating propellers?But yes, WW1-WW2 era propellers were typically 3-4 bladed ones with some having 5 blades while modern ones could go up to 6-7 blades as well[URL unfurl="true"]https://wonderfulengineering.com/wp-content/uploads/2019/03/Submarine-propeller.jpg[/URL][URL unfurl="true"]http://www.hisutton.com/images/SIERRA_Prop.jpg[/URL]
Maybe some submarines had contra-rotating propellers?
But yes, WW1-WW2 era propellers were typically 3-4 bladed ones with some having 5 blades while modern ones could go up to 6-7 blades as well
[URL unfurl="true"]https://wonderfulengineering.com/wp-content/uploads/2019/03/Submarine-propeller.jpg[/URL]
[URL unfurl="true"]http://www.hisutton.com/images/SIERRA_Prop.jpg[/URL]
