Yes, an interesting analysis. However, if your boat is below the surface, the system has already failed, and crush depth is irrelevent.
Yes, an interesting analysis. However, if your boat is below the surface, the system has already failed, and crush depth is irrelevent.
Senior Member
The inflatable containers referred to earlier by myself and Todd Bradshaw are also made in the US by CCA (Container Coporation of America) and one I have is coded as being from a NJ facility.You can buy these from several mail order office supply and or machine shop supply houses, I think you can also find them on the web if you snoop around. They are commonly used for cooking oils and the like in the restaurant trade. Try restaurants for used ones. Oh, restuarant suppy houses also sell these things.
Another relatively low coast inflatable device would be the bag-in-the-box used by the soft drink industry. These bags are also available in relatively large sizes. the big company on the West coast is Scholle. Another company is Liqui-Box. there used to be a midwest manufacturer to the NW of Chicago. Look in Thomas Register for bag-in-box or call a soft drink bottling plant .
Senior Member
The inflatable containers referred to earlier by myself and Todd Bradshaw are also made in the US by CCA (Container Coporation of America) and one I have is coded as being from a NJ facility.You can buy these from several mail order office supply and or machine shop supply houses, I think you can also find them on the web if you snoop around. They are commonly used for cooking oils and the like in the restaurant trade. Try restaurants for used ones. Oh, restuarant suppy houses also sell these things.
Another relatively low coast inflatable device would be the bag-in-the-box used by the soft drink industry. These bags are also available in relatively large sizes. the big company on the West coast is Scholle. Another company is Liqui-Box. there used to be a midwest manufacturer to the NW of Chicago. Look in Thomas Register for bag-in-box or call a soft drink bottling plant .
Senior Member
The inflatable containers referred to earlier by myself and Todd Bradshaw are also made in the US by CCA (Container Coporation of America) and one I have is coded as being from a NJ facility.You can buy these from several mail order office supply and or machine shop supply houses, I think you can also find them on the web if you snoop around. They are commonly used for cooking oils and the like in the restaurant trade. Try restaurants for used ones. Oh, restuarant suppy houses also sell these things.
Another relatively low coast inflatable device would be the bag-in-the-box used by the soft drink industry. These bags are also available in relatively large sizes. the big company on the West coast is Scholle. Another company is Liqui-Box. there used to be a midwest manufacturer to the NW of Chicago. Look in Thomas Register for bag-in-box or call a soft drink bottling plant .
Retro Member #1235
In the end, the amount of flotation required is approx equal to the amount of non-buoyant
material (ballast, etc) in the boat. Given that water weighs approx 62 lbs/cubic foot (if I
remember correctly) a boat with 620 pounds of ballast and non-buouant material would
require approx 10 cubic feet of air (tho obviously the buoyancy of the wood should be
taken into account), and that's a significant volume in any boat. Also the flotation will
need to be secured such that the fastenings/attachments are up to the boat's desire (at such
time this flotation is needed) of dropping out from underneath.
I once was witness to the attempted self-salvage of a Herreshoff S-boat. A harness of six
55-gallon barrels was attached to the boat at low tide. As the tide rose, low and behold,
so did the boat, complete with the cheers of the participants and the observers. Then,
quite spectacularly, one barrel collapsed, followed in immeadiate order by the other five.
The calculations were redone, eight barrels were attached for the next, successful,
attempt.
Øyvind, nice work - I'm getting lazy in my old age
Retro Member #1235
In the end, the amount of flotation required is approx equal to the amount of non-buoyant
material (ballast, etc) in the boat. Given that water weighs approx 62 lbs/cubic foot (if I
remember correctly) a boat with 620 pounds of ballast and non-buouant material would
require approx 10 cubic feet of air (tho obviously the buoyancy of the wood should be
taken into account), and that's a significant volume in any boat. Also the flotation will
need to be secured such that the fastenings/attachments are up to the boat's desire (at such
time this flotation is needed) of dropping out from underneath.
I once was witness to the attempted self-salvage of a Herreshoff S-boat. A harness of six
55-gallon barrels was attached to the boat at low tide. As the tide rose, low and behold,
so did the boat, complete with the cheers of the participants and the observers. Then,
quite spectacularly, one barrel collapsed, followed in immeadiate order by the other five.
The calculations were redone, eight barrels were attached for the next, successful,
attempt.
Øyvind, nice work - I'm getting lazy in my old age
Retro Member #1235
In the end, the amount of flotation required is approx equal to the amount of non-buoyant
material (ballast, etc) in the boat. Given that water weighs approx 62 lbs/cubic foot (if I
remember correctly) a boat with 620 pounds of ballast and non-buouant material would
require approx 10 cubic feet of air (tho obviously the buoyancy of the wood should be
taken into account), and that's a significant volume in any boat. Also the flotation will
need to be secured such that the fastenings/attachments are up to the boat's desire (at such
time this flotation is needed) of dropping out from underneath.
I once was witness to the attempted self-salvage of a Herreshoff S-boat. A harness of six
55-gallon barrels was attached to the boat at low tide. As the tide rose, low and behold,
so did the boat, complete with the cheers of the participants and the observers. Then,
quite spectacularly, one barrel collapsed, followed in immeadiate order by the other five.
The calculations were redone, eight barrels were attached for the next, successful,
attempt.
Øyvind, nice work - I'm getting lazy in my old age
Senior Member
Blowing air into tanks works. I raise a sunk lobster boat with nothing more comples than a few 55 gal drums open at one end, some slings, and an extra scuba tank.
But ramming a few dozen old coke bottles around is pretty inefficient. Even flat froms, like all the surplused architectural styrofoam in my firend's barge, is lucky to float out at about 50% space to contain the floatation vs. actual flotation. Bottles are even less efficient.
To keep usable space in the boat, I'd advocate either good construction to have air tanks or, if you want to float even when the hull looses integrity, which is a nice time to float, bite the bullet, pay the man a dollar, and get the foam.
For us larger boat types, there used to be an outfit that was making what amounted to an internal life raft. Pull a lanyard and CO2 would fill some bags strategically placed. I th ink they are out of business, and don't know whether no one wanted the product or whether it turned out not to work.
Oh yeah, we saltwater types usually think about 64#/cuft, but when you allow for safety-fudge factor and easy inthehead division, I usually go with 60#.
Whatever, keep the 'PFD'.
Senior Member
Blowing air into tanks works. I raise a sunk lobster boat with nothing more comples than a few 55 gal drums open at one end, some slings, and an extra scuba tank.
But ramming a few dozen old coke bottles around is pretty inefficient. Even flat froms, like all the surplused architectural styrofoam in my firend's barge, is lucky to float out at about 50% space to contain the floatation vs. actual flotation. Bottles are even less efficient.
To keep usable space in the boat, I'd advocate either good construction to have air tanks or, if you want to float even when the hull looses integrity, which is a nice time to float, bite the bullet, pay the man a dollar, and get the foam.
For us larger boat types, there used to be an outfit that was making what amounted to an internal life raft. Pull a lanyard and CO2 would fill some bags strategically placed. I th ink they are out of business, and don't know whether no one wanted the product or whether it turned out not to work.
Oh yeah, we saltwater types usually think about 64#/cuft, but when you allow for safety-fudge factor and easy inthehead division, I usually go with 60#.
Whatever, keep the 'PFD'.
Senior Member
Blowing air into tanks works. I raise a sunk lobster boat with nothing more comples than a few 55 gal drums open at one end, some slings, and an extra scuba tank.
But ramming a few dozen old coke bottles around is pretty inefficient. Even flat froms, like all the surplused architectural styrofoam in my firend's barge, is lucky to float out at about 50% space to contain the floatation vs. actual flotation. Bottles are even less efficient.
To keep usable space in the boat, I'd advocate either good construction to have air tanks or, if you want to float even when the hull looses integrity, which is a nice time to float, bite the bullet, pay the man a dollar, and get the foam.
For us larger boat types, there used to be an outfit that was making what amounted to an internal life raft. Pull a lanyard and CO2 would fill some bags strategically placed. I th ink they are out of business, and don't know whether no one wanted the product or whether it turned out not to work.
Oh yeah, we saltwater types usually think about 64#/cuft, but when you allow for safety-fudge factor and easy inthehead division, I usually go with 60#.
Whatever, keep the 'PFD'.
Senior Member
Making inflatable tubes to fit in your boat yourself shouldn't really be that hard. The rubber covered fabric that liferafts and rubber dinghys are made of is as about as easy to glue as patching a bike tube. It only requires a bit more temperature and humidity control. Inflation may be provided by a CO2 or air filled tank (CO2 delivers more gas per storage volume since it's in a liquid state when stored). Lanyard operated tank valves, input (w/one-way valve) and relief valves (VERY important) may probably be had pretty cheap from a discarded liferaft if you contact a liferaft maintenance shop. They should also be able to help you with fabric and glue. Roll the tubes into "sausages" to fit where you want, and wrap them in canvas sewn together with something that will break when the tubes are inflated. Cheap low-pressure hose, such as used for pressurized air tools, may be used for connecting the tubes with the gas tank(s). Just make sure the tubes have room to expand.
Senior Member
Making inflatable tubes to fit in your boat yourself shouldn't really be that hard. The rubber covered fabric that liferafts and rubber dinghys are made of is as about as easy to glue as patching a bike tube. It only requires a bit more temperature and humidity control. Inflation may be provided by a CO2 or air filled tank (CO2 delivers more gas per storage volume since it's in a liquid state when stored). Lanyard operated tank valves, input (w/one-way valve) and relief valves (VERY important) may probably be had pretty cheap from a discarded liferaft if you contact a liferaft maintenance shop. They should also be able to help you with fabric and glue. Roll the tubes into "sausages" to fit where you want, and wrap them in canvas sewn together with something that will break when the tubes are inflated. Cheap low-pressure hose, such as used for pressurized air tools, may be used for connecting the tubes with the gas tank(s). Just make sure the tubes have room to expand.
Senior Member
Making inflatable tubes to fit in your boat yourself shouldn't really be that hard. The rubber covered fabric that liferafts and rubber dinghys are made of is as about as easy to glue as patching a bike tube. It only requires a bit more temperature and humidity control. Inflation may be provided by a CO2 or air filled tank (CO2 delivers more gas per storage volume since it's in a liquid state when stored). Lanyard operated tank valves, input (w/one-way valve) and relief valves (VERY important) may probably be had pretty cheap from a discarded liferaft if you contact a liferaft maintenance shop. They should also be able to help you with fabric and glue. Roll the tubes into "sausages" to fit where you want, and wrap them in canvas sewn together with something that will break when the tubes are inflated. Cheap low-pressure hose, such as used for pressurized air tools, may be used for connecting the tubes with the gas tank(s). Just make sure the tubes have room to expand.
Member
How about filling that space with ping-pong balls, or suffing those styrofoam packing peanuts into the plastic soda jugs. LOL
Member
How about filling that space with ping-pong balls, or suffing those styrofoam packing peanuts into the plastic soda jugs. LOL
Member
How about filling that space with ping-pong balls, or suffing those styrofoam packing peanuts into the plastic soda jugs. LOL
When working for a photo finisher I salvaged the plastic bottle ( some ridged but the bigger 5 gallon cubes colaspe into a stackable pyramids) I got a fairly good supply of washed out jugs but eventually the boss got more and more worried that I'd become a super fund site he would be responsible for so that ended that.
Jeffery
When working for a photo finisher I salvaged the plastic bottle ( some ridged but the bigger 5 gallon cubes colaspe into a stackable pyramids) I got a fairly good supply of washed out jugs but eventually the boss got more and more worried that I'd become a super fund site he would be responsible for so that ended that.
Jeffery
When working for a photo finisher I salvaged the plastic bottle ( some ridged but the bigger 5 gallon cubes colaspe into a stackable pyramids) I got a fairly good supply of washed out jugs but eventually the boss got more and more worried that I'd become a super fund site he would be responsible for so that ended that.
Jeffery
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