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Air Pressure In Logs

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kartracer28 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kartracer28 Quote  Post ReplyReply Direct Link To This Post Topic: Air Pressure In Logs
    Posted: 01/16/2012 at 6:58am
At the boat show over the weekend it looks as if the manufactures are all going to air in the logs. All had MAX PRESSURE 3.5 LBS. . I asked why air in logs an was told that you can level the ride with the amount of air in each side. Will air pressure make that much difference.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SunBlocker Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 7:40am
Whoever told you that was sorely mistaken.  The amount of air pressure in sealed logs will have absolutely no effect on the buoyancy....
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kartracer28 Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 8:53am
Scottbee, why do they put air in the toons,
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 10:04am
To test for leaks after the toons are made so they can repair it before it goes out (it was on an episode of "How Do They Do It" or something like that. I had seen them doing that at the factory tour in 2008
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SunBlocker Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 12:02pm
I actually have my logs plumbed and they run off of a low pressure regulator on my on-board compressor.  I also have a safety blow-off valve set at 5psi, just in case the regulator fails. This serves two purposes:

1)  Pressurized logs are slightly more resistant to denting due to blunt impact.

2)  Should I have any (small) void below the waterline the positive pressure will keep air bubbling out and stop water from coming in.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 1:38pm
Its for dent resistance
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kartracer28 Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 3:12pm
The toons had schrader values on all three toons with sticker about the 3.5 lbs. So what is being said is that logs with air pressure in them is less likely to dent.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 3:41pm
Yes that is correct.
 


Edited by NH Tooner - 01/16/2012 at 4:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CajunDiver Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 8:07pm
If they are putting Schrader valves on them then they need to get ready for some disgruntled customers who dont read the sticker and blow their logs out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lake Kerr Guy Quote  Post ReplyReply Direct Link To This Post Posted: 01/16/2012 at 9:19pm
Originally posted by briankinley2004 briankinley2004 wrote:

If they are putting Schrader valves on them then they need to get ready for some disgruntled customers who dont read the sticker and blow their logs out.
 
Damage to the logs will be the least of their problems when it goes boom.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bamby Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 7:06am
I used to be huffed at years ago on this issue myself because the boat I owned had schrader valves on each pontoon. People seemed to imply I was a nut case and no manufacture utilized them... but they did and still do and model I owned was a 2005... So I'm challenging you gruffer's that everyone is going to "blow up their pontoons" because the manufacture installed "Schrader valves" to actually reinforce your case with some sort of evidence of individual idiots who have actually managed to blow them up... Wink  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PS-Guy Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 8:33am
Forest River Brochure:
 
"Air pressurized pontoons increase strength and provide rigidity to allow longevity in extreme water conditions"
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CajunDiver Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 9:18am
I don't have any evidence just what I have heard on here LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PS-Guy Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 10:53am
Here ya go:
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Liquid Asset Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 4:09pm
     Wow this topic of pressure in the logs reminds me of when my buddy was testing my logs after the welding. We were joking about pressuizing the logs but not with air. Might as well fill them with helium and float above of the water LOL  Might just be able to up the capacity rating then !!! On a serious note he did say that he was in a shop when a fuel cell was tested and blew. He thought a bomb went off.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 4:59pm
Reminds me when I was 17 trying to get a job at a gas station. Guy was talking to me and showing me how to repair a truck tire, the old ones that had 2 piece rims. He was airing it up when BAM, rim exploded, killed him on the spot. I wonder if those toons if they explode could have just as bad an effect as the tire did? I realize they eventually developed tire cages but it still instilled fear so bad I wouldn't have nothing to do with truck tires (until I became a truck driver after I retired from law enforcement). Probably wouldn't take but one toon to explode near me and I wouldn't dream of putting air in one. I'd be chicken and not put more than 2lbs air in it ConfusedEmbarrassed if that much
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SunBlocker Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 5:02pm
There is at least one documented case that I know of where an "exploding" log killed a person.  Blew the end-cap off and he died of blunt-force trauma.  The log wasn't on a pontoon boat though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fredeboy Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 6:50pm
Wildcat
You bought up some old memories I would just as soon not think about. I worked in a tire store going to college many years ago. Those 2 piece truck rims were just death waiting to happen.Ouch
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 8:22pm
yeah I hear ya, but I often think about that guy. That day made a big impression on me and never felt so helpless in all my life.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CajunDiver Quote  Post ReplyReply Direct Link To This Post Posted: 01/17/2012 at 9:44pm
That picture is worth a thousand wordsWink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bamby Quote  Post ReplyReply Direct Link To This Post Posted: 01/18/2012 at 6:00am
Yea, But that picture is all over the internet and it's a fail... That pontoon in question was blown up at a pontoon boat manufactures facility by a negligent employee.... I'm not saying it couldn't happen but thankfully there is little if any evidence of anyone actually ever blowing one up on themselves... In this society where there are lawyers representing every for of "idiot" from themselves do you really think manufactures would put themselves at risk of frivolous  lawsuits if they thought it could or would be a real liability...Wink  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NH Tooner Quote  Post ReplyReply Direct Link To This Post Posted: 01/18/2012 at 6:51am
They should consider a pressure relief valve.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lando Quote  Post ReplyReply Direct Link To This Post Posted: 01/18/2012 at 11:35pm

 Basic physics  (P1V1)/T1 = (P2V2)/T2  wher P is pressure, V is volume and T is temperature

Temperature swings would cause gains and losses in pressure in the logs. (fixed volume).  That is why they need the valves and compressors. Too much hassel,  Buy .090 logs and those humongous fenders instead.
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