Half a croissant, on a plate, with a sign in front of it saying '50c'
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Custard Filled Silent Sub Chaser - Now With Added Fuel Efficiency

Semi soft hull to absorb wave impact.
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Using 8s above water fan system, this would add to the stealth of the boat.

A semi soft hull filled with some sort of gel that would absorb the impact of waves without resultant impact noise. This would differ from inflatable boats that act as drums when hit with a wave by creating a hollow resonating area for the impact sound.

Fill your rubber destroyer hull with custard and hunt subs.

doctorremulac3, Feb 16 2020

Powered like so. Fanjet-propelled_20sub_20chaser
[doctorremulac3, Feb 16 2020]

Novgorod https://en.wikipedi...an_monitor_Novgorod
"... nicknamed the ship a "popovka", a diminutive form of the designer's name." [8th of 7, Feb 16 2020]

Stable submerged pontoon ship design. https://images.app....l/F1MP2pPLLfyFy1mt7
[doctorremulac3, Feb 16 2020]

Pretend this is a boat. https://www.google....-cCFQAAAAAdAAAAABAN
Ignore the Flintstones. [doctorremulac3, Feb 16 2020]

[link]






       I don't think jam and bees work underwater.
pertinax, Feb 16 2020
  

       This might well be a valid concept.
8th of 7, Feb 16 2020
  

       I wonder if you might get some added efficiency due to the up and down motion being limited to some extent by the pliable hull. Rather than the whole ship moving up the bottom just flexes.   

       I should look into this for fuel efficiency...Ok, I've looked into it. It would enhance fuel efficiency.
doctorremulac3, Feb 16 2020
  

       The thing is, how many Custard Filled Silent Subs are there to chase?
MaxwellBuchanan, Feb 16 2020
  

       Nobody knows; that, in essence, is the problem....
8th of 7, Feb 16 2020
  

       Hmmm. Instead of a flexible hull, how about a StickleBrix hull? In essence, the deck of the boat is supported on many, many vertical buoyant struts. Each strut contributes to net buoyancy, but a wave would pass through them and dissipate rather like a wave going through a reed-bed or mangrove swamp.
MaxwellBuchanan, Feb 16 2020
  

       "Hairy" hullforms and coatings have been investigated, the problem being that, like biofouling, they massively increase drag.
8th of 7, Feb 16 2020
  

       Interesting idea though if I'm picturing it right. So you have one big boat atop thousands of tiny boats on presumably spring loaded struts?   

       More parts to get the same job done though no?
doctorremulac3, Feb 16 2020
  

       //one big boat atop thousands of tiny boats//   

       Not quite. OK, imagine a table with lots and lots of legs, all made of a buoyant material. If the legs are sufficiently numerous and buoyant (and if the table top is not too heavy), the thing will float with all the legs partly submerged, and the tabletop carried clear of the water.
MaxwellBuchanan, Feb 16 2020
  

       Think of it like an oil exploration platform, [doc] - one with many tiny legs, the platform wide and low to the water.   

       Unfortunately it would have all the maneuvering vices of a Popovka <link>, and then some.
8th of 7, Feb 16 2020
  

       The overall shape could still be shippy, and indeed each leg could have a very boaty outline at the waterline.
MaxwellBuchanan, Feb 16 2020
  

       OK, so a submerged pontoon ship with lots of pontoons instead of two. (link)   

       But you're just adding resistance compared to the dual pontoons in the link. The water flows around the support, then hits the front of the next support, and the next.   

       But if you put them on springs to get out of the way, there might be some value to that. Although come to think of it, you'd just be transferring the forward friction into upward motion that the motor would still have to overcome I think so there might not be any net reduction.
doctorremulac3, Feb 16 2020
  

       Yep, that link is going in the right direction. But I was thinking that the more pontoons you have, the more diffuse the wave-breaking and hence the lower the noise. Maybe.
MaxwellBuchanan, Feb 16 2020
  

       I'm thinking that if you have them spring loaded (back to that) attached together like a caterpillar so you have like 20 caterpillar looking things undulating along you might get some benefit.   

       Has anybody done rollers? Where you just have soft wheels that roll? Big long wheels like the Flintstone's car if that makes any sense. So the wave hits the wheel, cylinder or whatever and the wheel turns on well oiled ball bearings.The boat's rolling on water. See link, assume the "wheels" in the picture are buoyant but pliable and roll easily. You'd have to scrape the water off the backside so it didn't ride up creating more friction.   

       Any benefit? Dhunno.
doctorremulac3, Feb 16 2020
  

       //spring loaded // You mean so they can move up and down independently, or side to side? If up and down, I'm not sure it'll gain you much; water climbing and falling around a constant-section "leg" shouldn't create much noise.
MaxwellBuchanan, Feb 16 2020
  

       Yea, I'm sticking with the custard. Fewer parts too.
doctorremulac3, Feb 16 2020
  

       Hmmm, custard, the new cure for cancers that aren't responsive to buns. I like it. You guys continue your guy talk about hulls and the like. To me, a hull is part of the corn cob. I'm from Illinois. Not UK.
blissmiss, Feb 16 2020
  
      
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