planetPlosion
30.05.2021 10:44:13
Rigid, is more robust, tougher to fit to the boat, heavier.
For the most part is fairly immune to the pressure thing. Of course eventlually, anything will implode given enough pressure differential. here
See full version: How much weight can 1 cubic foot of water displace
Rigid, is more robust, tougher to fit to the boat, heavier.
For the most part is fairly immune to the pressure thing. Of course eventlually, anything will implode given enough pressure differential. here
The only trick here is keeping the air captive.
Find out the weight of the whole rig. Divide by the appropriate bouyancy number, lets use 62 (lbs per cubic ft) and you have the required number of cubic feet of air to keep this thing afloat(awash)
Of course you'll have to remember the weight of the container and add it to the weight of the boat.
Also you have two types of containers.
Flexible. And rigid.
Flexible tend to be easier to install, but more fragile and prone to chafing and leaks. Also if the boat gets pushed a few feet under, the flexible container will compress, lose volume and therebye bouyancy. Remember a baloon at the surface(1 atmosphere) will be half the size at 33ft of sea water(2 atmospheres) So if your boat has only enough bouyancy to barely keep it awash, and three people are sitting on it and a wave comes by and they stand up, the boat may disappear. here
I love it when Jim gets all technical like that. Very cool! more
Flotation is based on water displacement, so 1 S.F of air should float the weight of 1 S.F of water minus the weight of the container. If its not in a rigid container you would have to account for compresion, and that would get complicated quick. D
Don't get too theoretical on the calculations. ALWAYS allow a fudge factor. On the side of additional bouyancy, and strength.
1 gram is equal to 0.035274 ounces so to get a result in ounces simply multiply the grams by 0.035274. You can also use our weight conversion calculators to convert from grams and kilograms to pounds and ounces.
The weight of a volume of water can be found given the density, which is the mass compared to the volume. The density of water is 1 kilogram per liter (kg/L) at 39.2°.
The density of water varies slightly at different temperatures which will impact the weight of for the same volume. here
In common US measures, one gallon of water weighs 8.345 pounds. here
To find the weight of water, start by finding the density(1 kg/L at 39.2°) and the volume of water. Convert the volume of water to liters and then multiply by the density to find the weight. Use our volume conversion calculators to convert different volumes to liters. here
This means that 1 liter (L) of water weighs 1 kilogram (kg) and 1 milliliter (mL) of water weighs 1 gram (g) . more
Technical units conversion tool for water volume vs. weight measures. Exchange reading in cubic feet of water unit ft 3 - cu ft into pounds of water unit lb wt. as in an equivalent measurement result (two different units but the same identical physical total value, which is also equal to their proportional parts when divided or multiplied). [links]
Prefix or symbol for cubic foot of water is: ft 3 - cu ft here
Prefix or symbol for pound of water is: lb wt.
How many pounds of water are contained in one cubic foot of water? To link to this water volume vs. weight - cubic foot of water to pounds of water units converter, only cut and paste the following code into your html.
The link will appear on your page as: on the web units converter from cubic foot of water (ft 3 - cu ft) to pounds of water (lb wt.) [links]
Ice defies the temperature rule mentioned above because water molecules expand as they freeze, increasing in volume and becoming less dense. This is why ice floats on water. As a comparison to water at 70 F, which weighs 62.3 pounds per cubic foot, ice weighs 57.2 pounds per cubic foot. Therefore, a cubic foot of ice weighs less than a cubic foot of water by more than five pounds.
Divers can increase and decrease their buoyancy levels by adjusting their air. This allows them to float, sink further into the water, or stay neutral, which is called neutral buoyancy. more
Buoyancy levels of objects are determined by their weight as well as the amount of water displaced by that weight, according to the Archimedes Principle. An ocean liner floats, for example, because it displaces a huge volume of water.