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originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
originally posted by: punkinworks10
a reply to: ignorant_ape
Why let real world physics get in the way.
Things like,, weight of the rigging and envelope and how does that affect the volume and amount of heat required to lift object+rigging+envelope.
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
originally posted by: Harte
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
So, about 40 of those to lift yer average pyramid stone.
Harte
originally posted by: Hanslune
originally posted by: Harte
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
So, about 40 of those to lift yer average pyramid stone.
Harte
Hey smart math guy could you possibly determine how much surface area that would create that wind could exert pressure of- at say 17 kph or 11 mph. I remember that all airships had the same enemy - wind. Unless you wanted to go where the wind was going
originally posted by: Harte
If you want to do it, I can tell you that the pressure on the bag surface changes with the cosine of the angle between the wind vector and the surface of the bag. But that will make the surface change shape so the angle(s) will change too, so...
That's why they run simulations for such questions.
Harte
originally posted by: Harte
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
So, about 40 of those to lift yer average pyramid stone.
Harte
originally posted by: Hanslune
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
Yep, you can certain make a covering for a hot air balloon but how about hydrogen production and storage?
originally posted by: Hanslune
originally posted by: punkinworks10
a reply to: ignorant_ape
Why let real world physics get in the way.
Things like,, weight of the rigging and envelope and how does that affect the volume and amount of heat required to lift object+rigging+envelope.
That and wind. Balloons fixed to the ground will spin unless they have tail sections and guidance. Having been in the Egypt a number of times, its a windy place except at dawn and dusk.
Wind at Cairo airport:
www.windfinder.com...
so about 25% of the time you have 9 knot winds or 17 kph or 11 mph......
Goldbeater's skin is a sheet of tissue traditionally used in the process of making gold leaf by goldbeating. The skin consists of the processed outer membrane of an animal's intestine, typically an ox, and is interleaved with gold stock to facilitate batch production of many leaves at the same time.
To manufacture goldbeater's skin, the gut of oxen (or other cattle) is soaked in a dilute solution of potassium hydroxide, washed, stretched, beaten flat and thin, and treated chemically to prevent putrefaction. A pack of 1,000 pieces of goldbeater's skin requires the gut of about 400 oxen and is 1 inch (25 mm) thick. Up to 120 sheets of gold laminated with goldbeater's skin can be beaten at the same time, since the skin is thin and elastic and does not tear under heavy goldbeating.
originally posted by: bloodymarvelous
originally posted by: Harte
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
So, about 40 of those to lift yer average pyramid stone.
Harte
Or one of them measuring 40 x 40 x 25 could do it (adding up to 40 k) .
Volume increases faster than one might think, when you grow the dimensions.
originally posted by: Hanslune
originally posted by: bloodymarvelous
Apparently 1000 cubic feet of hydrogen will lift 71 pounds. Sorry I couldn't find it in metric units.
www.airships.net...
So basically a cube 10 feet tall, 10 feet wide, and 10 feet long will lift a small child if it is made from light enough materials itself.
Yep, you can certain make a covering for a hot air balloon but how about hydrogen production and storage?
You couldn't make it all one balloon. Rather a bunch of tiny balloons (which is how the zeppelins of world war I were made) .
When you go to store it, you remove the balloons one at a time, and bring them into a cave or something.
Hydrogen production is actually pretty easy. You just need two wires connected to a battery. Nothing more.
Put the two wires into some water, and hydrogen will form at the cathode, and oxygen at the anode. Nothing more to it than that.
en.wikipedia.org...
As for the electricity, creating a battery doesn't really require an actual understanding of electricity. At the simplest level, you can put two metal objects made of different metals into a lemon, and that will produce electricity due to chemical interactions that happen to the metals.
Usually Zinc and Copper are good choices.
If you need more power, you can chain a lot of lemons together into one big battery.
en.wikipedia.org...
So all you need is for some smart guy to try putting two different metals into a lemon, and then put wires connected to them into some water, and notice the hydrogen bubbles forming.
He doesn't need to know why it is happening. He might come up with some silly theory about evil spirits drinking the lemon juice and burping out hydrogen, or whatever nonsense. Doesn't change the result any.
originally posted by: Hanslune
originally posted by: punkinworks10
a reply to: ignorant_ape
Why let real world physics get in the way.
Things like,, weight of the rigging and envelope and how does that affect the volume and amount of heat required to lift object+rigging+envelope.
That and wind. Balloons fixed to the ground will spin unless they have tail sections and guidance. Having been in the Egypt a number of times, its a windy place except at dawn and dusk.
Wind at Cairo airport:
www.windfinder.com...
so about 25% of the time you have 9 knot winds or 17 kph or 11 mph......
If we're talking about a truly ancient civilization during the ice age, then Egypt had a different climate back then.
originally posted by: punkinworks10
Since people brought up numbers and such,
The Hindenburg, arguablely the pinnacle of rigid hydrogen lifted, powered airship, had a gas volume of 7,062,000ft^3, providing 511,500lb of lift.
The total weight of the vehicle was 484,000lb, leaving enoungh lift for 27,500lb.
Which works out to 256.8ft^3 of H2 to lift 1lb of weight taking the weight of containment and structure to hold that volume of gas into account.
Hindenburg was originally designed for helium, heavier than hydrogen but nonflammable. Most of the world's supply of helium comes from natural gas fields in the United States, which had banned its export under the Helium Control Act (1927) in an effort to conserve helium for use in US Navy airships. Eckener expected this ban to be lifted, but to save helium the design was modified to have double gas cells (an inner hydrogen cell protected by an outer helium cell).[1] The ban remained however, so the engineers used only hydrogen despite its extreme flammability.[2] It held 200,000 cubic metres (7,062,000 cu ft) of gas in 16 bags or cells with a useful lift of approximately 232 t (511,000 lb). This provided a margin above the 215 t (474,000 lb) average gross weight of the ship with fuel, equipment, 10,000 kg (22,000 lb) of mail and cargo, about 90 passengers and crew and their luggage.
Hydrogen can be made simply by putting two electrically charged wires into water.