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Floatation in the form of inflatable tube where would you attatch them ??

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Floatation in the form of inflatable tube where would you attatch them ??

Old 01-11-2019, 12:33 AM
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Default Floatation in the form of inflatable tube where would you attatch them ??

This is part of the other post to see who is paying attention !
Nothing difficult or tricky just needs a little thought !!
If you had inflatable tubes as floatation devices where would you attach the to the boat to achieve maximum floatation??
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Old 01-11-2019, 02:19 AM
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On the inside of the gunwales, following the same line inside the cabin. Presumably you're thinking of something along the same diameter tube as a RIB? - Siting the gas canister(s) with that kind of volume might be more of a challenge - hidden in easily accessible but sealed below decks compartments?
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Old 01-11-2019, 02:48 AM
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How useful are they? Any idea on the ratio of air volume to kg that the volume is able to float?
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Old 01-11-2019, 02:59 AM
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I would probably strap them to my arms and legs.
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Old 01-11-2019, 04:47 AM
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whorrall seem there's on born each day !!
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Old 01-11-2019, 04:49 AM
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Clinker why attach to the inside of the gunnels , how would that displace the water INSIDE the hull ???
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Old 01-11-2019, 05:17 AM
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I don't mean between skins of the boat - I would be looking at it as a collar to keep the boat afloat and upright - using the same theory as a RIB with a flooded hull - I wasn't thinking of it in terms of displacing the water but in providing enough buoyancy to keep a flooded hull afloat. If you only displaced the water low down in the hull you're only going to create an unstable boat that would likely turn turtle (as would most boats with built in foam floatation - which of course is still a lot better in terms of survival and waiting for rescue than about that has gone to the bottom).

But the tubes probably need a bit more air volume than those of a RIB as a hard hull is likely to carry a good bit more water than the average flooded RIB hull. Were such a tube on the outside of the boat, chances are it could get damaged over years of coming alongside jetties and piers etc.

I guess the other idea for an airbag would be ones in lower compartments that are aimed a preventing water ingress/displacing water from the actual damage of hitting an underwater object. But such a system would do nothing for a boat swamped by a wave. Whether the collar tubes could also be supplemented by an air bag high up (on a T-top, A-frame etc) with enough buoyancy to right a capsized boat would take someone cleverer than me to do the calculations. Whichever - you're adding a huge expense to a leisure boat to cater for a pretty rare occurrence - most boat related drownings are from MOB situations, in which case personal buoyancy and personally means of calling for help are the only things that will increase survival chances.

However if you could develop such a system, good luck to you, but I think in most cases a liferaft would be still be a lot more cost effective if not quite as survival effective - and I think when most people weigh up cost to risk (which most have to do), the liferaft would remain the popular option.

Last edited by Clinker; 01-11-2019 at 05:23 AM.
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Old 01-11-2019, 05:18 AM
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I think the inflatable tubes should be in the form of a Zodiac!
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Old 01-11-2019, 05:20 AM
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Great idea. If they can put parachutes on planes, someone can put airbags on a boat.
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Old 01-11-2019, 05:21 AM
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in america we build boats that do not need tires attached to them to float!
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Old 01-11-2019, 05:23 AM
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I'd go above the boat like a hot air balloon.
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Old 01-11-2019, 05:24 AM
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Originally Posted by CraigT View Post
How useful are they? Any idea on the ratio of air volume to kg that the volume is able to float?

Ahhh, ........... rather simple, and very exact, and even simpler in the metric system. 1 litre of air volume will float 1 Kg. Simple as that. (Unless you want to get fussy and say it is sea water, which is then 1 litre of air will float 1.029 Kg.)
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Old 01-11-2019, 05:43 AM
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During the two minute time period it takes to fill the boat with water, I will easily have enough time to to casually stroll around the deck, unpacking and unfolding inner tubes, hooking up the air lines, checking and starting my gas powered air compressor, while positioning the tubes and air lines. With the extra time left over, I think I would fabricate some simple winch and lever arm type mechanism to push said tubes about about ten feet off each side of the hull, one at each transom corner and one at the bow. This would ensure the maximum buoyancy and stability. Granted, while this is all happening, I'm sure my wife will become proactive and cook some lunch so we are not hungry while stranded on the water, in which case, I may have to work at less of a relaxed pace if I need to get everything done (rigging, fabrication, lunch).
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Old 01-11-2019, 05:51 AM
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This thread made my head hurt and I actually think I lost some IQ points just reading it.
Must be way too cold to fish or boat.
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Old 01-11-2019, 06:25 AM
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Ok a couple of sensible people had partly the right idea ! But as I wrote the tube need to DISPLACE THE WATER from inside the boat ! So the bigger the tubes the more water is forced out and there you have it your boat with motors is floating again !!
Reason I write these things is to make people think how to do and reasons why !

Long time ago I worked in a inflatable boat company and the manager DUDLEY !posed that exact question to all the staff while having lunch one day so we tossed round lots of different ideas !The most brilliant idea and we made it work was big tubes inside of the boat !
We got a loan of a aluminum 14 foot boat and motor and went and sunk it !! and saw what happened , then took it back to the factory and made light weight BIG tubes and folded them up and attached to the floor near the outer edges , then back to the water sunk it then with dive bottles we inflated the tubes with two people inside the boat It floated in seconds but took a couple of minutes to fully inflate the tube AND the two guys HAD FAT TUBES TO SIT ON COMPLETLY OUT OF THE WATER , So more even more ideas came to hand of auto inflating how to do and what to use !
Co2 small gas capsules and aircraft auto inflate mechanizes that have a moisture pill inside that dissolves in salt water and releases the co2 and in seconds and a inflated tube ! one step further ! If the boat happen to be upside down 1 tube would auto inflate first and roll the boat over and the second tube inflated and was amazing how much water was displaced !! and then !! well you get the idea ! we devised many different options for various sized boats and a third tube for boats with lots weight in the back with big outboards ! Open boats cabin boats yachts of all sizes even up to 30 foot !
So what's next ??
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Old 01-11-2019, 06:25 AM
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Tunnles,!! If I'm ever in China!! I just gotta put a face to the name!!
Oh wait I am!! In Changzhou!! Only 120Km from you!!
Available every night after 7 and all day Sunday!! Just let me know!!
I'm here for a few weeks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!

Come visit and I will post a pic of the infamous Tunnles!!
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Old 01-11-2019, 06:33 AM
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will never happen ! sorry I take hundreds of photos of all and any thing all over the place as its my hobby and my wife take lots photos But im never hardly in any of her photos ! camera shy !
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Old 01-11-2019, 06:43 AM
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More info:

http://floatechmarine.com/index.html

Last edited by ukadrianj; 01-11-2019 at 06:54 AM.
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Old 01-11-2019, 06:49 AM
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Originally Posted by tunnles View Post
Open boats cabin boats yachts of all sizes even up to 30 foot !
So what's next ??
Like I said earlier, your big problem is going to be fitting a system at a cost that will appeal to leisure boaters (bearing in mind that life jackets and life rafts provide a system that has a risk level that most people would accept) The pill idea (sounds like you used a Halkey Roberts system - the more reliable ones use a paper collar to hold the spring from firing such as the UML mechanism) would be better as a hydrostatic system to prevent spray, rain etc from releasing the CO2 - but the size tubes you're describing will need to be huge compared to to a collar that doesn't displace all the water but provides enough buoyancy to keep the boat afloat - you don't need to displace all the internal water to do that and it would no doubt make the bags a lot cheaper and also a lot easier to install - they'll have to be in enclosed compartments to a. be acceptable to most boat owners, and b. ensure they stay protected enough to be capable of doing the job.
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Old 01-11-2019, 07:37 AM
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Different types of conditions call for different thinking ! This was nz in the late 1980s and its completely open ocean all round so just being buoyant is pretty scary But completely floating makes a huge difference and you can be seen much easier ! the number of boats that sink around the country is almost as bad as the road toll ! and boats get lost and are sometimes found upside down with just the nose sticking up !!and people drown usually because thee cant hold onto there up turned boat !
this system prevented all those things and gave a dry safe place to sit and wait to be saved and even towed back to shore !
an aluminum boat manufacture bought the idea !
Learning can be fun and very educational !!
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