Question?

1. Question?

I have a question not sure where to post it. Because it has to do with my jet boat I will start here.
I'm thinking to put some floatation jugs in the bow of my boat. The question I have is how much weight will a gallon of air float? I've done a web search, the math is way over my comprehension. To simplify my question, if you added weight to a gallon milk jug, how much weight would it take to make the jug start to sink?
Thanks in advance, be safe. schick

2.

3. Originally Posted by schick
I have a question not sure where to post it. Because it has to do with my jet boat I will start here.

I'm thinking to put some floatation jugs in the bow of my boat. The question I have is how much weight will a gallon of air float? I've done a web search, the math is way over my comprehension. To simplify my question, if you added weight to a gallon milk jug, how much weight would it take to make the jug start to sink?

Thanks in advance, be safe. schick

IMHO you are overthinking this...... for starters what kind of boat is thins going in? if it is your standard 70's/80's jet then you are cramped for space from the get go.... For what it is worth I would just go to your local tire shop and get yourself a good truck innertube and push it as far up in the bow as possible. then inflate just as if it were on a rim. this is exactly what i have done in my 1978 18' Sanger Super Jet.

4. X2 on the innertube. been doing it for 30 years.

5.

6. Originally Posted by Richard Till
X2 on the innertube. been doing it for 30 years.
Do you know anyone that has tested it ? I know I have floated boats within a few feet of the surface with very little, 3 5gal bags. There are tons of sharpe edges under a bow.

7. I've done the inner tube in the past, thanks for the suggestion. I'm looking for something a little more ridged, that will not be cut if the seam should split, or if the fiberglass should make a jagged edge.
Maybe someone can tell me the buoyancy of a cubic foot of air, that would be easier, I can figure it out from there.

Thanks again, be safe. schick

8. Floatation specs, check the local search and rescue. Floatation device for under the deck-go to www.candoproducts.net. they sell excersize balls in various sizes. They are tough and they even come in various colors for that designer sh\$t.

9. Fill the bow with Foam crack sealer. Only take 30-40 cans.

10. There is the expanding foam for marine use, but that stuff will hold water like a sponge.

Thanks again, be safe. schick

11. All I know is that it takes 90lbs of weight to sink a tool in a gas well that has 1000psi 85 lbs will float

12. 62.4 pounds per cubic foot

13. There was a topic on here a couple of months ago where a few guys, Outlaw being one, bought up 60 to 100 of thoughs foam float tubes you can buy at any store to stuff in front of the boat. I like the idea of the truck tube.

14. I think I found it, anything that displaces water is buoyant by the factor it displaces, minus the weight of the container. 1 cubic foot of air is 1728 cu.in. There is 231 cu. in. in a gallon. equals 7.48 gallons per cubic foot. Water weights 8.35 lbs per gallon.
7.48x8.35=62.45 is the weight of a cubic of water. If the container holding the water weights 5 pounds, the buoyancy of the container should be neutrally buoyant at 57.45lbs., (same as water)
So, long story short. A gallon of air should float a weight less then 8.35lbs. not including the weight of the container holding the air.
It's not the weight of your boat, but the amount of space it will
displace under the water.
This is my take, please post if I'm off.

Thanks for looking, be safe. schick

15. I found the foam tube deal but now sure how to post the link. Search for Cheap Extra Insurance by Skippers WFOT

16. SchicK you are right, floatation for a non bouyant item ( ie a solid item like a boat) is all about water displacement. It is my opinion that I couldnt put enough "air" under the deck of my boat to keep it afloat for very long. I know everyone will give you an answer of "I don't plan on sinking my boat" but the reality is, no one does. So my best advise (for what its worth) is put as "air" under the deck as possible without sacraficing all of your storage space. Just my .02

RC

Page 1 of 2 1 2 Last

Register Now

Please enter the name by which you would like to log-in and be known on this site.