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morbidreborn

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Date Signed Up:1/18/2010
Last Login:9/30/2016
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    FLY YOU FOOL FLY YOU FOOL
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    Wrong Wrong
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    La la la, la la ! Elmo's world. La la la, la la ! Elmo's world.
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    Webms Webms
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    Adorable Adorable
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latest user's comments

#22 - He could be using an estimation factor which is normally used …  [+] (2 replies) 09/21/2016 on Anons are Confused 0
#34 - anon (09/21/2016) [-]
No. Displacement hulls ride in the trough they create. When a ship move through the water they create a bow wave that the ship can't get over. The wave troughs along the length of the ship, and this is where all displacement hulls ride. The trough ends in another wave/wake at the stern of the ship.

Regardless of power, materials used, etc. physics prevents a displacement hull from getting over the bow wave and riding on top of the water. This is called a planing hull and it is incredible inefficient, requires tremendous power to plane, an is unsustainable (i.e. as soon as a planing hull slows down it sinks back into the water.) Where as a displacement hull can move efficiently indefinitely through the water with much less power. The size of the engine required to make a battle ship plane would be so heavy and large that it would be impossible. Again: physics.

The 1.34 constant is theoretical. Yes, that's true. And, with different shaped displacement hulls, lighter material, and more efficient propulsion, modern ships may be able to get closer to their theoretical hull speed or even eek out a smidgen more than the formulas tell us they should but not for long, and it isn't sustainable. There a pleasure cruiser boats called semi-displacement hulls that do this but at tremendous cost in fuel.

The point is that the harder a displacement hull pushes to get over its bow wave, the larger the bow wave becomes such that it cannot get over it. Consequently, all displacement hulls (all large ships because this is the most efficient way to move through water) travel, again, in the trough created by their bow wave, and again, this is a function of the length of the vessel fundamentally. That's it.

There is no magic. Push harder against a bow wave = larger bow wave that you can't get over. Physics, physics, physics. It is the sole reason for the odd looking bow in the pic I posted. The sole purpose of this is to make the length at the waterline longer and move the bow wave forward allowing for additional speed. That. Is. It! There's a reason they've been make large ships like this for thousands of years.

-a sailor

en.wikipedia.org/wiki/Hull_speed
#23 - amigobro (09/21/2016) [-]
yes thats what i meant by some factors being summed up in the constant
#20 - Aside from length, costs, area of operations, sea states, dead…  [+] (5 replies) 09/21/2016 on Anons are Confused 0
#21 - amigobro (09/21/2016) [-]
yeah yeah exactly, must be a ton of factors. Im assuming some would be summed up in the constant (1.34) but it just doesnt sound right to me. Anyway its an anon posting, its unlikely he/she will get back to us, i guess
#33 - anon (09/21/2016) [-]
No. Displacement hulls ride in the trough they create. When a ship move through the water they create a bow wave that the ship can't get over. The wave troughs along the length of the ship, and this is where all displacement hulls ride. The trough ends in another wave/wake at the stern of the ship.

Regardless of power, materials used, etc. physics prevents a displacement hull from getting over the bow wave and riding on top of the water. This is called a planing hull and it is incredible inefficient, requires tremendous power to plane, an is unsustainable (i.e. as soon as a planing hull slows down it sinks back into the water.) Where as a displacement hull can move efficiently indefinitely through the water with much less power. The size of the engine required to make a battle ship plane would be so heavy and large that it would be impossible. Again: physics.

The 1.34 constant is theoretical. Yes, that's true. And, with different shaped displacement hulls, lighter material, and more efficient propulsion, modern ships may be able to get closer to their theoretical hull speed or even eek out a smidgen more than the formulas tell us they should but not for long, and it isn't sustainable. There a pleasure cruiser boats called semi-displacement hulls that do this but at tremendous cost in fuel.

The point is that the harder a displacement hull pushes to get over its bow wave, the larger the bow wave becomes such that it cannot get over it. Consequently, all displacement hulls (all large ships because this is the most efficient way to move through water) travel, again, in the trough created by their bow wave, and again, this is a function of the length of the vessel fundamentally. That's it.

There is no magic. Push harder against a bow wave = larger bow wave that you can't get over. Physics, physics, physics. It is the sole reason for the odd looking bow in the pic I posted. The sole purpose of this is to make the length at the waterline longer and move the bow wave forward allowing for additional speed. That. Is. It! There's a reason they've been make large ships like this for thousands of years.

-a sailor

en.wikipedia.org/wiki/Hull_speed
User avatar
#22 - morbidreborn (09/21/2016) [-]
He could be using an estimation factor which is normally used in early stage design phases. I'm still relatively new to designing ships in uni so I can't say for certain. and anon might come back, maybe
#34 - anon (09/21/2016) [-]
No. Displacement hulls ride in the trough they create. When a ship move through the water they create a bow wave that the ship can't get over. The wave troughs along the length of the ship, and this is where all displacement hulls ride. The trough ends in another wave/wake at the stern of the ship.

Regardless of power, materials used, etc. physics prevents a displacement hull from getting over the bow wave and riding on top of the water. This is called a planing hull and it is incredible inefficient, requires tremendous power to plane, an is unsustainable (i.e. as soon as a planing hull slows down it sinks back into the water.) Where as a displacement hull can move efficiently indefinitely through the water with much less power. The size of the engine required to make a battle ship plane would be so heavy and large that it would be impossible. Again: physics.

The 1.34 constant is theoretical. Yes, that's true. And, with different shaped displacement hulls, lighter material, and more efficient propulsion, modern ships may be able to get closer to their theoretical hull speed or even eek out a smidgen more than the formulas tell us they should but not for long, and it isn't sustainable. There a pleasure cruiser boats called semi-displacement hulls that do this but at tremendous cost in fuel.

The point is that the harder a displacement hull pushes to get over its bow wave, the larger the bow wave becomes such that it cannot get over it. Consequently, all displacement hulls (all large ships because this is the most efficient way to move through water) travel, again, in the trough created by their bow wave, and again, this is a function of the length of the vessel fundamentally. That's it.

There is no magic. Push harder against a bow wave = larger bow wave that you can't get over. Physics, physics, physics. It is the sole reason for the odd looking bow in the pic I posted. The sole purpose of this is to make the length at the waterline longer and move the bow wave forward allowing for additional speed. That. Is. It! There's a reason they've been make large ships like this for thousands of years.

-a sailor

en.wikipedia.org/wiki/Hull_speed
#23 - amigobro (09/21/2016) [-]
yes thats what i meant by some factors being summed up in the constant
#25 - I liked akumetsu. Loved the drawing style.  [+] (1 reply) 09/20/2016 on Kyoani Justice 0
User avatar
#31 - ghostoffj (09/20/2016) [-]
Shit got so convoluted tho.
#29 - i ain't white  [+] (1 reply) 09/20/2016 on eHarmony: We banned listing... 0
User avatar
#32 - chuchiereaper (09/20/2016) [-]
Banned