View Full Version : Anchor bouy
shaungonemad
09-05-2014, 12:29 PM
Hi guys can some help my with how much weight a 300mm foam float will lift and what a similar sized inflatable bouy will lift. Thanks Shaun
scottar
09-05-2014, 12:54 PM
Not exactly answering your question but something to be careful of with inflatable/hollow devices for this exercise is crushing due to water pressure. For quite some time I used an empty chemical drum as a float. It was all good until the pick got a bit stuck one day and we obviously dragged the drum a bit deeper trying to free it. The thing imploded so we had to pull the pick the old fashioned way out of 200 feet of water. Not a real lot of fun.
Camhawk88
09-05-2014, 12:55 PM
The weight a bouy can support depends on how much water it can displace which is equal to its volume.
A 30cm bouy will displace (V = 4/3*pi* r3) about 94L of water so will float approximately 94kg. Subtract the weight of the bouy- lets say 4kg then it will float 90kg.
There will be no difference between a foam bouy and an inflatable bouy of the same size as they displace the same water however if one is lighter than the other it can lift a touch more as it is carrying less weight to start with.
shaungonemad
09-05-2014, 01:26 PM
The weight a bouy can support depends on how much water it can displace which is equal to its volume.
A 30cm bouy will displace (V = 4/3*pi* r3) about 94L of water so will float approximately 94kg. Subtract the weight of the bouy- lets say 4kg then it will float 90kg.
There will be no difference between a foam bouy and an inflatable bouy of the same size as they displace the same water however if one is lighter than the other it can lift a touch more as it is carrying less weight to start with.
Ok that sounds alot to me I had a 200mm ball I tried in my tank a while ago and it sunk with a small reef anchor and a length of chain.
scottar
09-05-2014, 01:52 PM
Most of the ratings for bouys around that size that I have found are about 12-13kgs
300mm dia Foam float will displace a bees dick over 14L of water. So about 14kg of lift
shaungonemad
09-05-2014, 05:22 PM
Ok that sounds more like what I was thinking thanks
gofishin
09-05-2014, 11:34 PM
The weight a bouy can support depends on how much water it can displace which is equal to its volume.
A 30cm bouy will displace (V = 4/3*pi* r3) ... Theory and equation are correct Cam but something went astray in the calculation.
QUOTE=Bull;1547934]300mm dia Foam float will displace a bees dick over 14L of water. So about 14kg of lift[/QUOTE]
...and that's 'no bull'... errr, I mean that's correct! :) But... what if it's a big bee....???
Seriously Shaun, I have a ~300mm and ~370mm (I guess) blow-up ball floats and with my reefy have ~6m of 6mm chain and an extended shank pic that's full of lead...so heavy enough (sorry don't know exact weight).
The smaller float is mostly/all under water when the pic is up, the larger one bobs easily with plenty of volume above water.
Cheers
Brendon
Sent from my iPhone using Tapatalk
Dreadz
11-05-2014, 11:00 AM
Not exactly answering your question but something to be careful of with inflatable/hollow devices for this exercise is crushing due to water pressure. For quite some time I used an empty chemical drum as a float. It was all good until the pick got a bit stuck one day and we obviously dragged the drum a bit deeper trying to free it. The thing imploded so we had to pull the pick the old fashioned way out of 200 feet of water. Not a real lot of fun.
Hmmm, I thought it was illegal to use empty chemical and oil containers as floats in Queensland?
Chimo
11-05-2014, 11:29 AM
I used a 20 lt black thick plastic acid drum for years and it is still fine.
Went upmarket in latter years with a 30 cm white foam float which also works. Used both with a stainless steel split ring that allows one to put on or off as the mood (deckie has or has not rebelled) and depth changes.
Cheers
Chimo
shaungonemad
11-05-2014, 06:26 PM
Hmmm, I thought it was illegal to use empty chemical and oil containers as floats in Queensland?
It probably is any way I was pulled over by a boat at Tin Can Bay over easter with a water police and a fisheries officer on board for the usual checks and they asked me if I had anything to ask them, I said yeah what about all the crab pot floats you see made from 4 or 5 litre oil bottles around the place, All he said was "yeah as long as you can see them there ok" and I said what about being 150mm in all directions and he said yeah dont worry to much. You try to do the right thing and others get away with everything.
scottar
11-05-2014, 09:27 PM
Hmmm, I thought it was illegal to use empty chemical and oil containers as floats in Queensland?
May well be now Jamie but this was 20 odd year ago mate. Things have changed a bit now mate. I work in commercial maritime now. You would not believe the hoops we have to jump through just to carry chemicals on board. Attitudes have certainly changed.
Dreadz
12-05-2014, 03:21 PM
It probably is any way I was pulled over by a boat at Tin Can Bay over easter with a water police and a fisheries officer on board for the usual checks and they asked me if I had anything to ask them, I said yeah what about all the crab pot floats you see made from 4 or 5 litre oil bottles around the place, All he said was "yeah as long as you can see them there ok" and I said what about being 150mm in all directions and he said yeah dont worry to much. You try to do the right thing and others get away with everything.
Yeah shaun if I had those oil containers as floats I would still be paying the fine http://www.ausfish.com.au/yabbfiles/Smilies/hanged.gif
Powered by vBulletin® Version 4.2.3 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.