KR> Tire pressure and Slime
It's been a while since this subject came up, but I've had two flat tires on landing due to a pinched tube, and learned years ago that if I need to keep a minimum of 25 psi in my tires...I fill them up to 50 PSI and check them every couple of months, especially as the temps start dropping toward winter. I also put Slime in the tires to minimize the chance of any kind of air leak doing that to me again. It seems to have worked out fine, as I've not had a flat tire since. There was some concern voiced on the net that my tires would be unbalanced, but I've seen no sign of that at all. I put all new tubes and tires on 1JF when I refurbed it, and it's had a slow leak ever since on one side. About a month ago I put some Slime in it, and it's still holding 50 psi. Something to consider. See y'all at the Gathering... -- Mark Langford ML at N56ML.com http://www.n56ml.com
KR> Tire pressure and Slime
Nitrogen is supposed to be better to not slow leak because the molecules are bigger than regular air. I always took that with a grain of salt thinking how much of a difference can it make. A few months ago I helped a neighbor rebuild the nose strut on his 172. He wanted to fill it with nitrogen instead of regular air, but our friends nitrogen bottle was empty. I have a CO2 bottle with a regulator for portable use of air tools and figured that would be as dry as the nitrogen and just as good. We filled the strut and the next day it was empty. Did it again and same results. Googled and found that CO2 has molecules smaller than regular air so we filled it with air and it has been good since. So, how much slower would nitrogen leak than air, no idea, but worth a try. Airline tires are filled with nitrogen for less leakage, more convenient on the line to roll out a nitrogen bottle than a compressor that can go to a few hundred PSI, and less expansion at high temperatures. Original Message Subject: KR> Tire pressure and Slime From: Mark Langford via KRnet I put all new tubes and tires on 1JF when I refurbed it, and it's had a slow leak ever since on one side. About a month ago I put some Slime in it, and it's still holding 50 psi. Something to consider.
KR> Tire pressure and Slime
^Mark L. "About a month ago I put some Slime ^in it, and it's still holding 50 psi." I don't have access to nitrogen for my tires, nitrogen is what we used in the Army, I do have access to slime and I use it in my ?tires with great success. Another useful item I recommend is the tire pressure gauges that are also stem caps. ?You can purchase them at Walmart or auto parts stores for about $10 or less. ?When your tire pressure is good then the cap is green if the pressure gets below 35 psi the tab turns red. I look at them every time I walk by. ?Even the cheap ones work. Joe Nunley?CW2 US Army RetiredBaker JROTC Instructor?Baker Florida?
KR> Tire pressure and Slime
Bob and Dick Kohler present a method of mounting tires on split aircraft rims. Dick specifically shows how to avoid pinching the tube on the split rims. No need for slime. Use either site depending on your search engine. http://eaavideo.org/video.aspx?v=784777819001 http://bcove.me/5dbxoeg9 Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA It's been a while since this subject came up, but I've had two flat tires on landing due to a pinched tube, .-- Mark Langford --
KR> Tire pressure and Slime
Sid Wood wrote: > Dick specifically shows how to avoid pinching the tube on the > split rims. No need for slime. I'm quite aware of how to assemble a tube into a tire with loads of talc to avoid a pinched tube. I haven't pinched a tube yet, and I've replaced 16 tires on the KRs so far, usually reusing the tubes. As I said in my post, I learned the secret to avoiding pinched tubes (after initial installation) is to keep them aired up to above 25 psi (or avoid really hard landings). I added Slime to that tube because it had a slow leak and over a month it would drop down from 50 to 25 psi, and become susceptible to pinched tubes again, and the Slime put an end to it without me having to take the tire off and replace the tube. With this ancient brake setup, removing the wheel is a huge pain the the butt and would take at least an hour, not to mention jacking up the plane, which I don't like to do either. I started putting Slime in my mountain bike tires about ten years ago, after picking up a thorn or two every year and having to patch a tube on the road or walk home to get the truck. I put Slime in those tubes ten years ago, and haven't had a flat tire since...nor do I need to top off the tires nearly as often. My apologies though...I should have kept that to myself, rather than concern the list with it. Mark Langford ML at N56ML.com http://www.n56ml.com
KR> Tire pressure and Slime
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KR> Tire pressure and Slime/Nitrogen
Of course compressed air is 78% Nitrogen. You use nitrogen on struts because it's dry so you don't add moisture to the strut. Nitrogen in tires is mostly a waste of money for tires since some moisture and 20% other gasses included aren't going to make much of a difference in the leakage rate. -Jeff Scott ? Nitrogen is supposed to be better to not slow leak because the molecules are bigger than regular air. I always took that with a grain of salt thinking how much of a difference can it make. A few months ago I helped a neighbor rebuild the nose strut on his 172. He wanted to fill it with nitrogen instead of regular air, but our friends nitrogen bottle was empty. I have a CO2 bottle with a regulator for portable use of air tools and figured that would be as dry as the nitrogen and just as good. We filled the strut and the next day it was empty. Did it again and same results. Googled and found that CO2 has molecules smaller than regular air so we filled it with air and it has been good since. So, how much slower would nitrogen leak than air, no idea, but worth a try. Airline tires are filled with nitrogen for less leakage, more convenient on the line to roll out a nitrogen bottle than a compressor that can go to a few hundred PSI, and less expansion at high temperatures. Original Message -------- Subject: KR> Tire pressure and Slime From: Mark Langford via KRnet I put all new tubes and tires on 1JF when I refurbed it, and it's had a slow leak ever since on one side. About a month ago I put some Slime in it, and it's still holding 50 psi. Something to consider. _
KR> Tire pressure and Slime/Nitrogen
The reason nitrogen is used on planes is that heat does not effect pressure. We use it to pressure test hvac systems. I can charge it with 350 lbs at 10 o'clock and 80* outside an come back at 4 when it is 105* and it will have the same pressure. Aircraft use it because tires do not expand when filled with nitrogen. My struts take nitrogen if you use air the strut will very in length when temp changes. Sent from my iPhone > On Sep 11, 2016, at 9:47 PM, Jeff Scott via KRnet > wrote: > > > Of course compressed air is 78% Nitrogen. You use nitrogen on struts because > it's dry so you don't add moisture to the strut. Nitrogen in tires is mostly > a waste of money for tires since some moisture and 20% other gasses included > aren't going to make much of a difference in the leakage rate. > > -Jeff Scott > > > > > Nitrogen is supposed to be better to not slow leak because the molecules > are bigger than regular air. I always took that with a grain of salt > thinking how much of a difference can it make. > > A few months ago I helped a neighbor rebuild the nose strut on his 172. > He wanted to fill it with nitrogen instead of regular air, but our > friends nitrogen bottle was empty. I have a CO2 bottle with a regulator > for portable use of air tools and figured that would be as dry as the > nitrogen and just as good. We filled the strut and the next day it was > empty. Did it again and same results. Googled and found that CO2 has > molecules smaller than regular air so we filled it with air and it has > been good since. > > So, how much slower would nitrogen leak than air, no idea, but worth a > try. Airline tires are filled with nitrogen for less leakage, more > convenient on the line to roll out a nitrogen bottle than a compressor > that can go to a few hundred PSI, and less expansion at high > temperatures. > > > Original Message > Subject: KR> Tire pressure and Slime > From: Mark Langford via KRnet > > > I put all new tubes and tires on 1JF when I refurbed it, and it's had a > slow leak ever since on one side. About a month ago I put some Slime in > it, and it's still holding 50 psi. Something to consider. > > > _ > > ___ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
