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#1
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1-26 Inner Tube Mayhem
Our beloved 1-26 (the Karmann Ghia of sailplanes) keeps busting inner
tubes. Like every other flight! NOTE that there is nothing rough on the inside of the tire or rim. My thinking is that we have a mismatch between the tube and the tire. The are in fact of different sizes. I should have written the sizes down and should have reported it here. I will do that soonest. So, riddle me this - If the tube is too large then it will become pinched which is bad. Right? If too small, won't it just inflate to the correct size/shape, within reason that is? We are using talcum powder - is this good or bad? Or should the tire and tube be of identical size? Thanks for any suggestions. - John |
#2
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1-26 Inner Tube Mayhem
On Tuesday, May 8, 2012 2:28:39 PM UTC-4, JohnDeRosa wrote:
Thanks for any suggestions. Much more gentle landings ! |
#3
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1-26 Inner Tube Mayhem
On 5/8/2012 2:28 PM, JohnDeRosa wrote:
Thanks for any suggestions. Is there any reason why the tire might be spinning on the wheel when you brake? That would tear up an inner tube about every other flight... Vaughn |
#4
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1-26 Inner Tube Mayhem
Not enough information to say for sure. A too-large tube might crease
inside the tire causing weak spots but it's hard to imagine you would be using a tube so small it wouldn't inflate to fill the tire. Most will inflate 2x without undue stress. However, using the right size is important. My guess is the tire is sliding around on the wheel. Since the tube is anchored at the valve stem it will rip as the tire rotates on the wheel. Could it be someone used liquid soap to help fit the tire to the rim? Soap is a big no-no since it makes a great lubricant for tire slip and tube failure when it gets wet. Expensive tire-fitting goop designed to hold a tire in place is available but in the motorcycle community, ordinary furniture polish is held in high esteem when used for this purpose. The big-scooter guys bet their butt on their tires every time they ride so they tend to know these things. On May 8, 12:28*pm, JohnDeRosa wrote: Our beloved 1-26 (the Karmann Ghia of sailplanes) keeps busting inner tubes. *Like every other flight! *NOTE that there is nothing rough on the inside of the tire or rim. My thinking is that we have a mismatch between the tube and the tire. The are in fact of different sizes. *I should have written the sizes down and should have reported it here. *I will do that soonest. So, riddle me this - If the tube is too large then it will become pinched which is bad. *Right? * If too small, won't it just inflate to the correct size/shape, within reason that is? *We are using talcum powder - is this good or bad? *Or should the tire and tube be of identical size? Thanks for any suggestions. - John |
#5
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1-26 Inner Tube Mayhem
On May 8, 3:45*pm, Bill D wrote:
Not enough information to say for sure. *A too-large tube might crease inside the tire causing weak spots but it's hard to imagine you would be using a tube so small it wouldn't inflate to fill the tire. *Most will inflate 2x without undue stress. * However, using the right size is important. My guess is the tire is sliding around on the wheel. *Since the tube is anchored at the valve stem it will rip as the tire rotates on the wheel. *Could it be someone used liquid soap to help fit the tire to the rim? *Soap is a big no-no since it makes a great lubricant for tire slip and tube failure when it gets wet. Expensive tire-fitting goop designed to hold a tire in place is available but in the motorcycle community, ordinary furniture polish is held in high esteem when used for this purpose. *The big-scooter guys bet their butt on their tires every time they ride so they tend to know these things. On May 8, 12:28*pm, JohnDeRosa wrote: Our beloved 1-26 (the Karmann Ghia of sailplanes) keeps busting inner tubes. *Like every other flight! *NOTE that there is nothing rough on the inside of the tire or rim. My thinking is that we have a mismatch between the tube and the tire. The are in fact of different sizes. *I should have written the sizes down and should have reported it here. *I will do that soonest. So, riddle me this - If the tube is too large then it will become pinched which is bad. *Right? * If too small, won't it just inflate to the correct size/shape, within reason that is? *We are using talcum powder - is this good or bad? *Or should the tire and tube be of identical size? Thanks for any suggestions. - John Find the hole in the tubes, this will tell where the puncture is occurring. If the tire is sliding in relation to the rim, the hole will be near the valve stem (this shouldn't be happening on a 1-26, because the rubber brake pad bumper is in direct contact with the tire when braking). If the hole is on the rim side (bottom of the tube), the rim is the problem. If on the tire side (top of the tube), the tire. You may have a piece of wire or glass embedded in the tire that is puncturing the new tube. The tube size is not critical, but needs to be close. Ed |
#6
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1-26 Inner Tube Mayhem
On May 8, 11:28*am, JohnDeRosa wrote:
Thanks for any suggestions. - John Under-inflation and firm landing could cause pinch flats. As others have said you need to examine the puncture/damage area for clues as to what is happening. The tyre and tube should be the correct size for the wheel but who knows what you could get away with if you only need one landing. Andy |
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