posted on Jul, 6 2017 @ 10:13 PM
a reply to: Zaphod58
Then there was that time google earth got imagery of a Boomer in dry dock screw and all. That didnt go over well.
Now if you look on google maps at moored decommissioned SSN and SSBN you notice all the screws were literally removed so sats couldnt see their blade
The cutback blade shape is the most efficient for cavitation mitigation. Wonder if shapes like that would be useful on aircraft wingtips.
More blades the less vibration or noise. But theyre less efficient. so you have to start making the blades variable pitch to be dynamic enough to
prevent slippage. Ie if a full revolution of a screw theoretically pushes 35 feet of water or something. Due to higher blade count and slippage in
actuality you push only 28 feet of water and efficiency goes down in exchange for less vibration and cavitation.
edit on 6-7-2017 by BASSPLYR because: (no reason given)