Author Topic: D4 RAINFLY PATTERNS AND NOTES  (Read 1471 times)

Deuce

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D4 RAINFLY PATTERNS AND NOTES
« on: September 07, 2019, 09:11:55 PM »
Attached is a "how-to" PDF I made up for the local activists, who needed better shelter for their tree platforms.  A good introduction on how to make a rainfly.

For the "Activist Fly", I kept things simple, so that the height of the fly was the same as the height of the suspension.  For A5 and D4 ledges, we wanted to create more room, so the fly actually has a horizontal strip on the wall side, as most fabrics come in 60" widths, and we design for about 72-76" heights on the wall side for climbing portaledges.  You can see the pattern in the back of this PDF, and I will also be posting more patterns to consider for various dimension ledges.

Bit of history:  prior to A5, all portaledge rainflys were made from six panels, sewn together. These took ages to seam seal, and even seam sealed, seams are the main weakness in keeping the inside dry.  At A5, we were inspired by the single seam Teepee designs, and created the first rectangular portaledge single seam rainflys.  Now, this design is standard on all portaledges.
« Last Edit: September 19, 2020, 05:58:52 PM by Deuce »

Deuce

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Re: Rainfly general notes
« Reply #1 on: September 22, 2019, 05:13:54 PM »
Bit more on the rainflys here, some old patterns:
https://www.bigwalls.net/forumStatic/index-topic=217.0.php.html

There has since been a lot of DIY folks who have furthered this idea of the single seam fly with good explanations--
good explanation here:  http://www.taiwanrock.50webs.com/pirate_portaledge_rainfly.html
Treefool's also done a lot of work to describe process here:  https://treefool.com/2014/09/07/diy-portaledge-cheap-easy-and-light/#f

Deuce

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Re: Rainfly general notes
« Reply #2 on: September 23, 2019, 05:34:25 PM »
More on Rainflys.

The new D4 "deep corner pocket" system has proven to be a success and is the future of all rainflys--no impossible to really cinch drawcord system.

Here's the formula for any kind of corner--I will try to explain further later if anyone has questions about how to create a trim corner pocket.

Also attached are the seam that works well for the horizontal seam, and also more general notes.

Djdriftking

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Re: Rainfly general notes
« Reply #3 on: August 18, 2020, 08:45:01 PM »
I've been making measurements and paper prototypes today and I think I'm ready to purchase the materials to start making a fly--I was wondering what denier fabric that you used in the more modern flys? I read in previous literature that the "lightweight 70d" almost resulted in your demise on half dome--does that still hold true or has fabric technology advanced enough that it's safe to use materials less than 200d oxford?

Deuce

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Re: Rainfly general notes
« Reply #4 on: August 19, 2020, 02:33:40 AM »
This is very good fly material, what we use on D4’s
https://ripstopbytheroll.com/collections/waterproof-polyester-fabric/products/hyperd-301?variant=11156282881

7 yards usually suffices, depending on your design. They sell by half yard, so 14 or 15 half yards will generally be enough.
« Last Edit: August 19, 2020, 02:36:58 AM by Deuce »

Deuce

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Re: Rainfly general notes
« Reply #5 on: August 19, 2020, 11:43:11 PM »
You are looking for fabric with at least PU3000 coating. (I get fabric for Delta2p’s with 5000pu coating).  Most fabrics generally come with a thinner coating which is not waterproof.

I also have made, and might make again as I recently found a supplier, PTFE material flys.  But in my experience, breathable flys only work in cold dry arctic type weather. Vented waterproof flys for portaledges are better for all around stormproofness.

Deuce

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Re: Rainfly general notes
« Reply #6 on: September 19, 2020, 05:58:22 PM »
Nice homebuild: