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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.
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]
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Annotation:
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I don't think jam and bees work underwater. |
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This might well be a valid concept. |
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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. |
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I should look into this for fuel efficiency...Ok, I've looked
into it. It would enhance fuel efficiency. |
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The thing is, how many Custard Filled Silent Subs are there to
chase? |
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Nobody knows; that, in essence, is the problem.... |
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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. |
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"Hairy" hullforms and coatings have been investigated, the problem being that, like biofouling, they massively increase drag. |
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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? |
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More parts to get the same job done though no? |
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//one big boat atop thousands of tiny boats// |
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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. |
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Think of it like an oil exploration platform, [doc] - one with many tiny legs, the platform wide and low to the water. |
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Unfortunately it would have all the maneuvering vices of a Popovka <link>, and then some. |
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The overall shape could still be shippy, and indeed each leg
could have a very boaty outline at the waterline. |
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OK, so a submerged pontoon ship with lots of pontoons
instead of two.
(link) |
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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. |
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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. |
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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. |
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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. |
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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. |
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//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. |
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Yea, I'm sticking with the custard. Fewer parts too. |
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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. |
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