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Dec 30th, 2023
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 for you Big Brain folks
#13260586
08/26/19 08:56 PM
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Joined: Oct 2001
Posts: 15,624
Mo
OP
TFF Guru
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OP
TFF Guru
Joined: Oct 2001
Posts: 15,624 |
How much weight to sink a 4 ft section of 4 inch pvc pipe, capped at both ends.
For this exercise You may assume neutral bouncy for the pvc it self.
For extra credit , how deep could you submerge this section ( assume sch 40 ) before it starts to deform and crush ?
MO
 MY BACKYARD , 20,000 ACRES , NO MOWING 
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Re: for you Big Brain folks
[Re: Mo]
#13260595
08/26/19 09:00 PM
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Joined: Sep 2008
Posts: 121,182
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 121,182 |
last part first, schedule 40 is rated to 220 psi so at whatever depth 221 psi happens is about your bottom.
notice please that that is 220-221, whatevah!
now for the first part, assuming neutral buoyancy then 1# should be enough to sink it but for good measure I would fill that suckah with rocks and sink it.
" Hop, set the hook"!
hopalong 99,999
TexDawg 99,999
FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: for you Big Brain folks
[Re: hopalong]
#13260639
08/26/19 09:52 PM
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Joined: Oct 2001
Posts: 15,624
Mo
OP
TFF Guru
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OP
TFF Guru
Joined: Oct 2001
Posts: 15,624 |
last part first, schedule 40 is rated to 220 psi so at whatever depth 221 psi happens is about your bottom.
notice please that that is 220-221, whatevah!
now for the first part, assuming neutral buoyancy then 1# should be enough to sink it but for good measure I would fill that suckah with rocks and sink it. the pipe is neutral , the air inside the pipe is the issue. I want to suspend a crappie condo at 16 ft in 30 ft of water. MO
MY BACKYARD , 20,000 ACRES , NO MOWING
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Re: for you Big Brain folks
[Re: Mo]
#13260647
08/26/19 09:57 PM
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Joined: Aug 2014
Posts: 7,570
Beer Money
TFF Celebrity
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TFF Celebrity
Joined: Aug 2014
Posts: 7,570 |
I'll get you started. First you need to find the volume of the inside of the pipe.
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Re: for you Big Brain folks
[Re: Mo]
#13260649
08/26/19 09:58 PM
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Joined: Jan 2005
Posts: 124,223
TexDawg
Top Dawg
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Top Dawg
Joined: Jan 2005
Posts: 124,223 |
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Re: for you Big Brain folks
[Re: Mo]
#13260651
08/26/19 09:59 PM
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Joined: Sep 2008
Posts: 121,182
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 121,182 |
last part first, schedule 40 is rated to 220 psi so at whatever depth 221 psi happens is about your bottom.
notice please that that is 220-221, whatevah!
now for the first part, assuming neutral buoyancy then 1# should be enough to sink it but for good measure I would fill that suckah with rocks and sink it. the pipe is neutral , the air inside the pipe is the issue. I want to suspend a crappie condo at 16 ft in 30 ft of water. MO then all you have to do is fasten some nylon twine or rope or electric fence wire with a cinder block 14' below the pvc. let the air float it.
" Hop, set the hook"!
hopalong 99,999
TexDawg 99,999
FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: for you Big Brain folks
[Re: Mo]
#13260656
08/26/19 10:01 PM
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Joined: Sep 2008
Posts: 121,182
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 121,182 |
drill holes and poke your "limbs" in them then spray expanding foam in the 4", use extension straws to fill it full, mickey d's work great. or just drill a couple of extra holes and blow foam in them to fill the center
it will float forever as the foam is closed cell
Last edited by hopalong; 08/26/19 10:02 PM.
" Hop, set the hook"!
hopalong 99,999
TexDawg 99,999
FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: for you Big Brain folks
[Re: Mo]
#13260657
08/26/19 10:03 PM
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Joined: May 2014
Posts: 5,811
PondFish
TFF Celebrity
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TFF Celebrity
Joined: May 2014
Posts: 5,811 |
last part first, schedule 40 is rated to 220 psi so at whatever depth 221 psi happens is about your bottom.
notice please that that is 220-221, whatevah!
now for the first part, assuming neutral buoyancy then 1# should be enough to sink it but for good measure I would fill that suckah with rocks and sink it. the pipe is neutral , the air inside the pipe is the issue. I want to suspend a crappie condo at 16 ft in 30 ft of water. MO Sink a heavy anchor, attach one end of a rope or chain to the anchor and calculate how long the rope or chain would need to be to keep the crappie condo at 16 feet deep; attach the loose end of the chain or rope to the crappie condo.
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Re: for you Big Brain folks
[Re: Mo]
#13260669
08/26/19 10:11 PM
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Joined: Jul 2010
Posts: 9,861
TR176
TFF Celebrity
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TFF Celebrity
Joined: Jul 2010
Posts: 9,861 |
I can’t start my calcs until I know some GPS coordinates.
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Re: for you Big Brain folks
[Re: hopalong]
#13260674
08/26/19 10:15 PM
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Joined: Oct 2001
Posts: 15,624
Mo
OP
TFF Guru
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OP
TFF Guru
Joined: Oct 2001
Posts: 15,624 |
drill holes and poke your "limbs" in them then spray expanding foam in the 4", use extension straws to fill it full, mickey d's work great. or just drill a couple of extra holes and blow foam in them to fill the center
it will float forever as the foam is closed cell I know how to make it float but the question is how much weight to sink it ? It will probably an 8 ft section with " limbs only on the bottom , top end capped, rope on the bottom down to weight. Mo
MY BACKYARD , 20,000 ACRES , NO MOWING
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Re: for you Big Brain folks
[Re: Mo]
#13260750
08/26/19 11:30 PM
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Joined: Mar 2004
Posts: 8,807
Roller22
TFF Celebrity
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TFF Celebrity
Joined: Mar 2004
Posts: 8,807 |
Drill holes throughout to insert limbs. Attach 2 cinder blocks on both ends with zip ties or wire. Lower with rope.
I Thes. 5:16-18
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Re: for you Big Brain folks
[Re: Mo]
#13260758
08/26/19 11:38 PM
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Joined: Sep 2008
Posts: 121,182
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 121,182 |
drill holes and poke your "limbs" in them then spray expanding foam in the 4", use extension straws to fill it full, mickey d's work great. or just drill a couple of extra holes and blow foam in them to fill the center
it will float forever as the foam is closed cell I know how to make it float but the question is how much weight to sink it ? It will probably an 8 ft section with " limbs only on the bottom , top end capped, rope on the bottom down to weight. Mo 2 cinder blocks and you will never see it again. 1/4" nylon rope
" Hop, set the hook"!
hopalong 99,999
TexDawg 99,999
FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: for you Big Brain folks
[Re: hopalong]
#13260797
08/27/19 12:22 AM
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Joined: Feb 2018
Posts: 17,122
Sawhorse
TFF Guru
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TFF Guru
Joined: Feb 2018
Posts: 17,122 |
drill holes and poke your "limbs" in them then spray expanding foam in the 4", use extension straws to fill it full, mickey d's work great. or just drill a couple of extra holes and blow foam in them to fill the center
it will float forever as the foam is closed cell I know how to make it float but the question is how much weight to sink it ? It will probably an 8 ft section with " limbs only on the bottom , top end capped, rope on the bottom down to weight. Mo 2 cinder blocks and you will never see it again. 1/4" nylon rope The Deliverance float trippers thought this and it didn’t turn out so well.
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Re: for you Big Brain folks
[Re: Sawhorse]
#13260803
08/27/19 12:29 AM
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Joined: Sep 2008
Posts: 121,182
hopalong
Pescador Loco
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Pescador Loco
Joined: Sep 2008
Posts: 121,182 |
drill holes and poke your "limbs" in them then spray expanding foam in the 4", use extension straws to fill it full, mickey d's work great. or just drill a couple of extra holes and blow foam in them to fill the center
it will float forever as the foam is closed cell I know how to make it float but the question is how much weight to sink it ? It will probably an 8 ft section with " limbs only on the bottom , top end capped, rope on the bottom down to weight. Mo 2 cinder blocks and you will never see it again. 1/4" nylon rope The Deliverance float trippers thought this and it didn’t turn out so well. cuz it takes 4 cinder blocks for a fat boy! geeeeeeeez! 
" Hop, set the hook"!
hopalong 99,999
TexDawg 99,999
FJB! not my president by a long shot!
lake fork FISHERMANS COVE MARINA/reservations - 903 474 7479
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Re: for you Big Brain folks
[Re: Mo]
#13260830
08/27/19 12:46 AM
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Joined: Mar 2004
Posts: 8,807
Roller22
TFF Celebrity
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TFF Celebrity
Joined: Mar 2004
Posts: 8,807 |
That's why I said two on each side.
I Thes. 5:16-18
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