Test the resolve of msduck member's

Delta Duck · Postby **Delta Duck** » Wed Oct 24, 2001 6:39 pm

To keep Gulfcoast from floating up with his pit how many lbs of concrete should be put in the bottom?

12' tank 64" diameter

I know some member of this forum can do some serious cyphering and take a good guess.

[ October 24, 2001: Message edited by: Delta Duck ]

Dutch Dog · Postby **Dutch Dog** » Wed Oct 24, 2001 7:00 pm

a bunch

Delta Duck · Postby **Delta Duck** » Wed Oct 24, 2001 7:10 pm

Dutch Dog,
How many lbs is in a bunch?

Postby **GulfCoast** » Wed Oct 24, 2001 7:38 pm

One each GulfCoast weighs 168 lbs, nekkid. Hope that helps with your 'rithmatic.

4-EYED GADWALL · Postby **4-EYED GADWALL** » Wed Oct 24, 2001 10:22 pm

you could fill it half full of concrete and it would still float up if it was not anchored I sell pit blinds and the bottom line is anchor.

Dutch Dog · Postby **Dutch Dog** » Wed Oct 24, 2001 10:28 pm

well, as best I can figger, you'd have to be some sort of physisist sp? (a person who studies physics. anyhow, you would have to figure out the volume of air enclosed in the pit and then figure out how much weight it would take to pull that volume of air underwater to the desired depth. let me tell you through trial and error that the farther down under water you try to pull oxygen, the harder it is to do. this year i tried to rig up a breathing tube that would allow me to stay under water for prolonged periods of time while "grabbling"....well after about a couple of feet down....probably 5 feet or so i was simply unable to suck air through that hose...it just wouldn't work. so there are many many factors that go into just how much weight it would take...sorry.

Postby **judge jb** » Thu Oct 25, 2001 8:21 am

prepare your pit in a manner that you think will work... if you arrive one morning and she floats like a battleship, fill her full of water and re-sink her. i got you this far, the rest is up to you...haha....

judgejb

Meeka · Postby **Meeka** » Thu Oct 25, 2001 8:36 am

I dont sell pits like 4eye does, but I did stay at a holiday inn express once . . . and our camp has sunk several and has learned by trial and error. 4EYE is right - anchor those suckers, you know, with anchors and straps they use on mobile homes. Whether to use 2 or 4 anchors depends on the depth into the ground, the anticipated (and unanticipated) water line/table and how long they will be in the ground before before the water comes up. A good pit should be allowed to "cure". An alternate or additional remedy is to put wings on that sucker.

Since we dont have our lease this year, our old blinds do not have straps on them! Ha!

Postby **GordonGekko** » Thu Oct 25, 2001 12:22 pm

Well here is just a stab at it but, I think in order for something to sink in water, something must have a greater specific gravity than water. That is a given volume of that substance (say one cubic foot) must weigh more than the volume of that area of water of which it intends to displace. If that is true a good guess would be that the weight of the concrete must be equal the weight of water the blind could hold (this would give it zero bouancy I think). So in other words I will assume that the tank is a cylinder (otherwise their wouldn't be a diameter), and using the cylinder volume formula V=(Pie)(r^2)(h), so it looks like this V=(3.1416)(2.67^2)(12), and this gives us approximately 268.04 cubic ft. (if my calculations are wrong let me know) as the volume of the blind, since water weighs about 62.3 lbs per cubic foot you would be about 16,698.89 lbs of H2O, or 8.35 tons. If this is correct you would need about 8.27 tons of concrete (Gulfcoast weighs .08 tons) to get the blind to neutral bouancy (in other words it won't float. However, all of this is figured on the basis of being in water, not in the ground on a flooded field, so it is probably off a bit, but it would definitely keep the blind from floating up too much.

After all of that the best thing to do is follow anchor it (the blind I hunt out of, in a flooded rice field, has both the wings that Meeka mentioned, and is anchored with four straps). I don't know of anybody that uses the concrete method, but I'm not saying it won't work. However, you would play heck if you ever had to move a blind that weighs in excess of 8 tons.

Sorry I rambled so long, I hope this is along the lines of what you were looking for Delta Duck. I made a lot of assumptions and you know what they say about those.

Gordon

[ October 25, 2001: Message edited by: GordonGekko ]

Jeff · Postby **Jeff** » Thu Oct 25, 2001 1:59 pm

Now that was physics at it's best. I'm impressed.

duckhuntalot · Postby **duckhuntalot** » Thu Oct 25, 2001 2:51 pm

I have an almost new mobile home anchor machine I can get rid of. I was in the business for several years. About the only thing I have left from the bus.

Contact me if your interested.

New they cost $580.
I'll let it go for 400 or best offer.

Delta Duck · Postby **Delta Duck** » Thu Oct 25, 2001 8:57 pm

Thanks for the insight fellows. I have put down a few dozen pits. I have had 2 float, both were anchored. The rest of the pits I've put concrete in after I sank them. I,ve always had the truck drive out and put the concrete in. This pit I am going to have to buy sack crete and dump in. I do know that 13" of concrete in the bottom of a 16' tank will hold it down.

What I should of asked is how much concrete would it take to put it 13" deep in a tank 12' by 64"

Mr Gekko should have no problem with that!!

Wingman · Postby **Wingman** » Thu Oct 25, 2001 9:18 pm

Gordon, you don't belong in a duck hole, you belong at NASA!

Wingman

JB · Postby JB » Fri Oct 26, 2001 8:10 am

Well I'm no physicist but I am a lowly soils engineer. Gekko is right on but he used the entire tank volume - do you have the tank completely buried on only half buried? If only half, take 1/2 of his number. The problem is moving the pit after all that concrete is in it. The better way is to use the wings - the weight of the soil above the wings holds the pit down. After you determine the weight needed to hold the pit down, you can figure the size the the wings by determining the volume of soil above the wings (hxwxd) and multiplying times the bouyant weight of soil which is around 110-62.4 = 48 lbs (say 50 lbs). This way, the pit can be removed at the end of the season. Hope that helps. If you have a specific case you'd like help with just holler.

Jeff

blacklab101 · Postby **blacklab101** » Fri Oct 26, 2001 9:39 am

Delta, if you want to fill up your pit that is 12'x64" with 13" of concrete it will take about 2.57 yrds(3). If I'm not right someone correct me. Volume= area x hight then /27 cause yrds(3)= 3'x3'x3'.
12'x 64"(5.33') x 13"(1.0833')= cubic feet but since they don't sell concrete by the cubic foot / 27 to get cubic yards. [img]images/smiles/icon_biggrin.gif[/img]

[ October 26, 2001: Message edited by: blacklab101 ]

[ October 26, 2001: Message edited by: blacklab101 ]

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