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Antiballast for flying ship

Aerodynamics can handle this, like blimps do using the lift of their elongated body and tail control surfaces. If using pre industrial technology, wood and fabric windmills-like propellers, wooden ...
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0 votes

Antiballast for flying ship

According to good ol Wikipedia, silica gel has been around since the 1640s, and was used in WWI to absorb vapors in gas masks. (https://en.wikipedia.org/wiki/Silica_gel) It can absorb about 40% of its ...
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1 vote

What fighting style/martial arts, techniques etc. would work well for flying people?

Depends on the weapons they are using. If they have guns, it might be a bit like fighter plane dogfight. If it's melee weapons, it might look a bit like a medieval joust. The combatants fly full speed ...
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3 votes

What fighting style/martial arts, techniques etc. would work well for flying people?

Pendulous, durable appendages. The problem with flying martial arts is that flying allows the body to build up tremendous kinetic energy. Grappling and throws are impossible at speed. What is ...
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0 votes

Antiballast for flying ship

Use a large stone tethered to a long cable spool on a drum. Release the drum and allow the airship to drop whilst the stone rises. Just before the stone reaches the end of the tether release large ...
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-1 votes

Antiballast for flying ship

I'm surprised nobody else mentioned this, but: Consider pulverizing the stones. For real, make a fine dust out of em and fill that in your airship balloon or w/e you're using for stone storage. This ...
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6 votes

Antiballast for flying ship

I'm surprised that nobody else has suggested this. Don't rely 100% on floatium for your buoyancy. Have a hot air balloon that takes your ship over the threshold. You don't need huge blimp-sized ...
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-1 votes

Antiballast for flying ship

Floatium is contained in a rotating drum Depending how much negative force the Floatium induces (does it rise inverse to gravity?) a drum rotated by sailors can be used to induce a tumble effect and &...
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3 votes

Antiballast for flying ship

Birds Dump some bird seed on the deck and play some territorial bird calls. Suddenly every bird in a kilometer radius has landed on your air ship and is weighing it down. You will have to be very ...
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6 votes

Antiballast for flying ship

Heat the stones. Whatever handwavium takes place to make the stones generate antigravity is reduced when the stones are heated. The Handwavium returns as the stones cool. Bonus, that is why the stone ...
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2 votes

Antiballast for flying ship

Reduce lift by using a tethered "balloon" to temporarily eliminate the lift of the stones. Simply throwing the stones overboard is not feasible due to their cost, but you can throw them ...
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5 votes

Antiballast for flying ship

How about using guide ropes? They pretty much self-regulate to a great extent. https://en.wiktionary.org/wiki/guide_rope Make the whole thing a hot air balloon. Your magic stones will make it ...
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0 votes

Antiballast for flying ship

Those stones don't "float" (which just means they are less dense than the surrounding medium, and that there's a maximum service ceiling). No, these are really weird stones: the provide a ...
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4 votes

Antiballast for flying ship

Ordinary, unheated air. At jet cruising altitude, outside air is -40 C to -70 C = 203 to 233 K. Comfortable cabin air = 298 K. 218/298 = 73%. Air inside cabin weighs more than 1/4 less than outside ...
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5 votes

Antiballast for flying ship

I guess we could use reaction of slaked lime with carbon dioxide. Ca(OH)2 + CO2 → CaCO3 + H2O But to get 1 kg of weight this way we would need to pass at least 3 ton of air through lime-water. Water ...
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9 votes

Antiballast for flying ship

All matter has mass. The stones are in the mountain because when the mountain was molten, and the material comprising the stones was still there, they did not float away into space. There is a ...
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13 votes

Antiballast for flying ship

The stones are expensive, so you dont add so many that the ship becomes weightless. You essentially build a Heavier-Than-Air airship. It will naturally float down if nothing is done, but by the use of ...
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25 votes

Antiballast for flying ship

Harvest extra ballast water from clouds. The Graf Zeppelin did this in real life during the 1930s. A set of gutters on the side of the vessel collected the water. The airship brushed against the edge ...
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14 votes

Antiballast for flying ship

Build a chain which incorporates some of the floating material. The resulting chain will be "weightless" and can therefore be of arbitrary length - instead of ultimately ripping under its ...
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34 votes

Antiballast for flying ship

Volume-based Adjustable Buoyancy The key here is to not use so many stones that your ships float up. Instead, use as many stones as is needed to make your ship effectively weightless. If 1kg of ...
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How much energy would it take to keep a floating city aloft?

I asked a physics-inclined friend how much energy it would take to keep this floating city aloft, and his answer surprised me: The formula was right, and it would take zero energy. He said that it ...
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How much energy would it take to keep a floating city aloft?

As others have mentionned you would indeed need no energy to keep it there only the initial energy to put it there I did some calculations, based on the weight of air and buoyancy, I might not be 100% ...
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2 votes

Foldable, multipart helicopter blades

A good estimating starting point is to look at the force on a point of the blade, and compare the relative force for a hinge point near the root against one near the middle or the end of the blade. ...
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1 vote

How much energy would it take to keep a floating city aloft?

Zero energy or fuel Lets say you have a helicopter with an exact ton of weight. To stay aloft, exactly at the height it is a ton heavy, you need to push exactly a ton of force upwards¹. Less than a ...
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3 votes

How much energy would it take to keep a floating city aloft?

I don't think any of the other answers are directly answering your questions, so: A helicopter stays aloft by pushing on the air, and the air annoyingly moves in response. If the air were solid, ...
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1 vote

How much energy would it take to keep a floating city aloft?

In case your Magic isn't super-powerfull, but you're in a technologically really advanced setting: Use the power of earths orbits! (Think of the International Space Station) Please note that with ...
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2 votes

How much energy would it take to keep a floating city aloft?

What, from a physics standpoint, is the difference between a helicopter that must expend energy to remain aloft and an apple on a table that does not? Both are pulled down by gravity. The apple is ...
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  • 147
13 votes

How much energy would it take to keep a floating city aloft?

The force you're causing may cost energy even if the energy doesn't go into the object it is acting upon. What you need to consider is "How does the city stay up?" Is mass being thrown down ...
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9 votes

How much energy would it take to keep a floating city aloft?

Floating. https://en.wikipedia.org/wiki/Buoyancy For this reason, an object whose average density is greater than that of the fluid in which it is submerged tends to sink. If the object is less dense ...
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  • 283k
26 votes
Accepted

How much energy would it take to keep a floating city aloft?

The zero-energy is the correct ideal answer. The act of keeping a city floating takes zero energy, as shown by the fact that the ground beneath our feet expends 0 energy keeping the city out of the ...
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