How many days are okay for the canopy to lay out on the field??

[stayhigh 2]

After cutaway, you find the canopy a week later, 7 days of sun but no rain.

Do a pull test???

What about the hma lines??? They look pretty decent.

Bernie Sanders for President 2016

[Chris-Ottawa 0]

I don't recall where I saw this, but I remember reading that 1 hour of sunlight can reduce the strength of webbing by up to 50%. 7 days of sun is all bad in my books, but I'd still jump it if it passed a pull test.

I think the wise thing to do would be to send it to the manufacture (if possible) and have them give it an airworthiness check.

NOTE: My percentage could be COMPLETELY incorrect, I don't recall exactly, but I know it's not good regardless.

"When once you have tasted flight..."

[sundevil777 93]

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I don't recall where I saw this, but I remember reading that 1 hour of sunlight can reduce the strength of webbing by up to 50%. 7 days of sun is all bad in my books,
NOTE: My percentage could be COMPLETELY incorrect, I don't recall exactly, but I know it's not good regardless.

Your memory must be wrong. 1 hour of sunlight exposure is likely from just one day of jumping.

That sounds like a lot, a whole 7 days...too much, until you actually take the time (pun intended) to look at that total a bit closer. A half hour total per jump of waiting out in the sun for the plane,dirt diving in the sun, the jump itself, and walking back to the hanger is reasonable. Do that several times a day and you very quickly get to 7 days of exposure. Even at 15 minutes per jump you get to 7 days exposure very quickly.

The 7 days in the sun is equivalent to a certain number of jumps, approx 300 if you use 15 min/jump. Fortunately for you, the UV intensity drops off early/late in the day. Anyway, you can assume different numbers for the min/jump and such.

People are sick and tired of being told that ordinary and decent people are fed up in this country with being sick and tired. I’m certainly not, and I’m sick and tired of being told that I am

[piisfish 135]

sundevil, do you dirtdive & wait for the plane with your canopy out ?? You must be a fast packer then

there was a study on fabric ageing which was published a couple of years ago by Soko, have the docs in my laptopp at home.

7 days out would certainly give some additional age to the fabric, give it/have it given a thorough inspection, and jump if deemed airworthy

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[sundevil777 93]

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sundevil, do you dirtdive & wait for the plane with your canopy out ?? You must be a fast packer then

there was a study on fabric ageing which was published a couple of years ago by Soko, have the docs in my laptopp at home.

7 days out would certainly give some additional age to the fabric, give it/have it given a thorough inspection, and jump if deemed airworthy

I was commenting on the effect of sun on the webbing (earlier post about webbing becoming so much weaker).

The number of min/jump that a canopy is exposed to the sun can be figured different ways-many different considerations could make for adjustments to the calculation, but 7 days isn't so many jumps of equivalent exposure. Probably a few to several hundred. It is lousy to have that age put on a canopy without the benefit of having jumped it, but not so much to worry about.

People are sick and tired of being told that ordinary and decent people are fed up in this country with being sick and tired. I’m certainly not, and I’m sick and tired of being told that I am

[shropshire 0]

Best I don;t fly my paraglider for longer than an hour then ..... whoops too late

(.)Y(.)
Chivalry is not dead; it only sleeps for want of work to do. - Jerome K Jerome

[piisfish 135]

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there was a study on fabric ageing which was published a couple of years ago by Soko, have the docs in my laptopp at home.

the actuall thread HERE

scissors beat paper, paper beat rock, rock beat wingsuit - KarlM

[davelepka 4]

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Do a pull test???

What about the hma lines??? They look pretty decent

Sure, do a pull test. Look at the lines. Then replace the risers and remember it's a main and just jump it.

The only 'catch' is that I wouldn't sell it without telling the buyer it spent a week in the sun. Otherwise, keep your cutaway cables clean and jump it.

[airtwardo 6]

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Best I don;t fly my paraglider for longer than an hour then ..... whoops too late

Yup & the seat-belts in your car are toast! (pun intended)

~ If you choke a Smurf, what color does it turn? ~

[jakee 1,254]

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I don't recall where I saw this, but I remember reading that 1 hour of sunlight can reduce the strength of webbing by up to 50%.

Think about it.

Do you want to have an ideagasm?

[jshiloh 0]

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The 7 days in the sun is equivalent to a certain number of jumps, approx 300 if you use 15 min/jump.

I am by no means an expert on this, so what I have to say may be completely off. But my gut says that 7 straight days of sun exposure is going to do significantly more wear than an equivalent number of hours in smaller chunks. Exposing a canopy to 8 hours of constant sunlight (possible more, depending on the time of year & specific location) is not the same as exposing it to the sun 32 times for 15 minutes each. An extended, constant exposure will build up a significant amount of heat, which I would think would contribute to additional damage.

Expose a CD to sunlight for 15 minutes, then take it inside & let it sit for 15. Do this 10 times. You'll have a CD that's been exposed to the sun for a total of 2.5 hours...it'll probably work fine, though at most you'll have slight distortion. Now take a CD and let it sit in the sun for 2.5 hours straight. There's a very good chance it won't play at all, and you may even have a melted hunk of plastic. While I realize that UV rays are the main danger to canopies, as opposed to just heat buildup, I would think the heat very likely could contribute to problems & accelerate the damage.

I would strongly suggest having this canopy inspected by an appropriate specialist for airworthiness. At worst, you're out a little money & out use of the canopy while it's being inspected. OTOH, it could save your life.

[sundevil777 93]

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An extended, constant exposure will build up a significant amount of heat

It doesn't work that way. The temperature of an object placed in the sun, especially a thin, lightweight object such as nylon fabric will very quickly rise to a steady state temperature. That steady state temperature happens when the amount of heat energy being absorbed by an object equals the amount of energy being dissipated by the object. It does not "build up" heat unless the temperature is also going up.

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take a CD and let it sit in the sun for 2.5 hours straight. There's a very good chance it won't play at all, and you may even have a melted hunk of plastic

That will only happen if you have it inside a closed car, where the windows will allow the greenhouse effect to increase temperatures much higher than ambient. Place the CD out in the open and it will quickly rise to a constant temperature. An object such as a large container of water would take a long time to rise get to a steady state temperature, but not nylon fabric.

People are sick and tired of being told that ordinary and decent people are fed up in this country with being sick and tired. I’m certainly not, and I’m sick and tired of being told that I am

[demoknite 0]

So basically the OP needs to tell us where on the the planet this occurred before we can come to a decent conclusion.

[mjosparky 3]

The actual damage done is a strength drop of around 40% in nylon after 250 hours of direct exposure to sunlight and 65% after 500 hours,

http://www.psychovertical.com/?manmade

Sparky

My idea of a fair fight is clubbing baby seals