Forums: Skydiving: Gear and Rigging:
Recoating old canopies?

 


tr027  (D License)

Aug 9, 2005, 10:56 AM
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Recoating old canopies? Can't Post

 
Will PD take a used canopy and recalendar/reslipperize it? If so you could essentially rebuild an old canopy like new with a new lineset and coating.


mark  (D 6108)

Aug 9, 2005, 12:53 PM
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Re: [tr027] Recoating old canopies? [In reply to] Can't Post

Yes, they will. The usual procedure is to replace rather than recoat the fabric, since the first coating is applied by the fabric manufacturer instead of PD. If you get a new set of lines at the same time, PD will probably throw in a new serial number for free.

Mark


Premier slotperfect  (D 13014)

Aug 9, 2005, 12:54 PM
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Re: [tr027] Recoating old canopies? [In reply to] Can't Post

From PD's website FAQ:

Quote:
We have heard of people doing this, but we don't recommend it.
The zero-p material we use is coated when the fabric is manufactured using a precise, controlled process. We don't buy low-porosity material and spray it ourselves to make it zero-p. Skydivers have tried using various products to make their own canopies "zero-p," but these products reportedly don't last very long if they even work at all. Certain chemicals can damage or degrade nylon, so you also risk shortening the life of your canopy by applying any product that isn't specifically recommended by the manufacturer.

It's also important to realize that canopies are designed around the specific fabric being used. The shape of the airfoils, trims, brake settings, and slider are all carefully selected to give the best combination of openings, flight characteristics, and landings. The shape of the parts and the trims used on zero-p canopies are very different from those used on canopies designed for F-111 type material.

So even if you could spray something on an "F-111" canopy to make it "zero-p," you might not be happy with the results. Doing this will probably cause the canopy to open way too fast, with extremely high opening forces. Structural failure of the canopy and serious personal injury may occur. Since each of our canopies is specifically designed for the type of fabric we use to build it, and changing the characteristics of the fabric can have undesirable effects.


phoenixlpr  (D 3049)

Aug 9, 2005, 1:14 PM
Post #4 of 10 (1361 views)
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Re: [slotperfect] Recoating old canopies? [In reply to] Can't Post

In my reading it's more about coating a non-ZP and not about recoating a ZP.


masterrig  (D License)

Aug 9, 2005, 1:17 PM
Post #5 of 10 (1358 views)
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Re: [slotperfect] Recoating old canopies? [In reply to] Can't Post

In reply to:
From PD's website FAQ:

Quote:
We have heard of people doing this, but we don't recommend it.
The zero-p material we use is coated when the fabric is manufactured using a precise, controlled process. We don't buy low-porosity material and spray it ourselves to make it zero-p. Skydivers have tried using various products to make their own canopies "zero-p," but these products reportedly don't last very long if they even work at all. Certain chemicals can damage or degrade nylon, so you also risk shortening the life of your canopy by applying any product that isn't specifically recommended by the manufacturer.

It's also important to realize that canopies are designed around the specific fabric being used. The shape of the airfoils, trims, brake settings, and slider are all carefully selected to give the best combination of openings, flight characteristics, and landings. The shape of the parts and the trims used on zero-p canopies are very different from those used on canopies designed for F-111 type material.

So even if you could spray something on an "F-111" canopy to make it "zero-p," you might not be happy with the results. Doing this will probably cause the canopy to open way too fast, with extremely high opening forces. Structural failure of the canopy and serious personal injury may occur. Since each of our canopies is specifically designed for the type of fabric we use to build it, and changing the characteristics of the fabric can have undesirable effects.
_____________________________________

A few years ago, a jumper at our DZ, sprayed his 'Fury' with tent spray (water repellent). He claimed the canopy flew "better than new!"LaughLaugh


Chuck


tr027  (D License)

Aug 9, 2005, 2:00 PM
Post #6 of 10 (1337 views)
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Re: [phoenixlpr] Recoating old canopies? [In reply to] Can't Post

In reply to:
In my reading it's more about coating a non-ZP and not about recoating a ZP.

So you would have to first send it to the fabric manufacturer for a recoat (if they do that), then send it to PD or a rigger/owner for the lineset.

It's seems too good to be true to get free ZP canopy fabric replacement with installment of a new lineset, doesn t it ?? that one canopy would last forever, literally.


mark  (D 6108)

Aug 9, 2005, 2:12 PM
Post #7 of 10 (1333 views)
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Re: [tr027] Recoating old canopies? [In reply to] Can't Post

In reply to:
So you would have to first send it to the fabric manufacturer for a recoat (if they do that), then send it to PD or a rigger/owner for the lineset.

Continuing to feed the trolls:

The manufacturer coats the fabric only when it is flat. You'll have to carefully disassemble your canopy, marking each piece of tape as well as each piece of fabric, so that it can be reassembled once it is recoated.

Mark


bodypilot1  (D 16037)

Aug 9, 2005, 10:00 PM
Post #8 of 10 (1264 views)
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Re: [mark] Recoating old canopies? [In reply to] Can't Post

In reply to:
Yes, they will. The usual procedure is to replace rather than recoat the fabric, since the first coating is applied by the fabric manufacturer instead of PD. If you get a new set of lines at the same time, PD will probably throw in a new serial number for free.

Mark


LaughLaughLaugh


Be safe.
Ed


JohnRich  (D License)

Aug 10, 2005, 1:20 PM
Post #9 of 10 (1172 views)
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Re: [mark] Recoating old canopies? [In reply to] Can't Post

In reply to:
The manufacturer coats the fabric only when it is flat. You'll have to carefully disassemble your canopy, marking each piece of tape as well as each piece of fabric, so that it can be reassembled once it is recoated.

I do know someone who once came up with a formula from the mil-spec for parachute nylon coatings. He would just hang the canopy up, and squirt it with a paint-sprayer to apply a fresh coat.

However, the several people I know who had him do that, ended up with bad results. The problem is that a canopy is old to begin with in order to need a new coating. And the new coating just transfers opening shock to other aged components, like seams and line attachement points, which start failing. I've seen several such treated canopies blow apart afterwards.

So my advice in this regard is that if the canopy is that bad, just retire the darned thing and get a new one. It's not worth it to try and breathe new life into it.

It becomes like an old car that requires ever-more maintenance to keep it running, and at some point, it just isn't worth the money any more.


(This post was edited by JohnRich on Aug 10, 2005, 4:12 PM)


phoenixlpr  (D 3049)

Aug 10, 2005, 1:25 PM
Post #10 of 10 (1170 views)
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Re: [JohnRich] Recoating old canopies? [In reply to] Can't Post

Wow! Thats a great post!



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