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MYOG Inflatable PFD - Progress Journal
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Dan Durston
(dandydan) - M

Locale: Cascadia
MYOG Inflatable PFD - Progress Journal on 01/27/2012 22:10:18 MST Print View

I figured I'd start a thread in the packrafting section to document the creation of my inflatable PFD since I'm super stoked about it.

The project started off as a hybrid air/foam PFD, but I've now shifted directions and I'm making purely an air PFD. I decided filling the air chambers about 1/3 to 1/2 full of foam would significantly increase the bulk and weight, while still sucking at being a PFD since it would be below the minimum amount of float I really need. Accordingly, this PFD is now an ultralight inflatable PFD for moderate wilderness use, and I'll use a more robust foam PFD if I ever start creek boating locally.

All materials to date have been ordered from QuestOutfitters.com

Stage 1 - Making the Vest
Using 2.2oz 70D nylon, I set about making a basic vest. I traced the outline (minus the sleeves) of a shirt that fits well onto my fabric. Then I cut that out and make a duplicate so I had two halves. I then sewed them together using flat felled seams.

Then I made the 'front' more of a front by adding a 'V' to the neck line and I cut it open down the front. I then enlarged the sleeve holes, mostly towards the front and bottom (as you can see in the first pic), so that there is lots of room to paddle without interference. Once I was happy with everything, I sewed on the edging from Quest. Unfortunately I didn't order quite enough (3 yards) so I'll have to finish the edging later.

PFD 1

PFD Seams

Stage 2 - The Back Chamber
With the vest made, the next order of business was to create the 3 air chambers (one upper back, two on chest) needed to float. I decided about 22 lbs of float (10 back, 12 chest) would be a decent amount, since I don't plan to run crazy white water with this.

I sat in my pack raft and figured out where I could position the air chamber that wouldn't interfere with my use of the back rest. I did think about eliminating the raft backrest and incorporating an air chamber into the vest instead, but I didn't want the floatation getting too low down my body because I want to make sure I float head up.

I deciding on a back chamber of 12" (wide), 9" (tall) and 2.5" thick. This gives me a total of 270 cubic inches and 9.7 lbs of float. I suspect in reality because the chamber will bulge a bit away from a perfect rectangle, I'll get a bit more float than this.

To make the chamber, I used 70D heat sealable nylon (from Quest). I didn't want to bond to equal halves together like is normally done to create sleeping pads and pillows, because I wanted a non-symetrical shape that would sit nicely against my back. This is hard to explain, so I'll let the photos do the talking:

Outer side:
Back Chamber 1

Flat side, which will get sewn to the vest around the 3/4" bonded perimeter:
Back Chamber 2

I'm super stoked about this air chamber. I still need to add the valve. It's going where my fingers are in the first picture. By putting it in the corner seam, I leave the perimeter seam intact so I can sew it to the vest all the way around.

As a side bonus, this is going to make an amazing pillow.

I haven't totally determined how I'm going to sew it to the vest yet, but it shouldn't be too hard. I might cut a hole and reinforce the edge before sewing it to the chamber, or I might just sew it on.

The work continues...

Edited by dandydan on 01/28/2012 09:59:02 MST.

Dan Durston
(dandydan) - M

Locale: Cascadia
PFD Weights on 01/27/2012 22:14:24 MST Print View

Oh...the chamber weighs 42g (1.48oz) and the valve will add ~0.2oz...for a 1.7oz total.

The vest is 44g (1.55oz) but it still needs another 4g in edging and then the webbing and buckles (1oz?).

Add in ~2.5oz for the two smaller chambers on the front, and I think I'm going to wind up around 7oz.

Edited by dandydan on 01/27/2012 22:28:45 MST.

John S.
(jshann) - F
Re: MYOG Inflatable PFD - Progress Journal on 01/28/2012 03:52:17 MST Print View

Very cool Dan. IIRC, my old SOSpenders Scout Life Vest weighed around 9 oz after taking off the autoinflate parts.

http://www.overstock.com/Sports-Toys/Sospenders-Scout-Life-Vest-Manual-Inflatable-PFD/752763/product.html

Dan Durston
(dandydan) - M

Locale: Cascadia
PFD's on 01/28/2012 10:08:33 MST Print View

I'll be happy as long as I can keep mine the same or lighter than that, since my vest is going to be quite a bit more featured and comfortable (hopefully).

Features Planned:
- The upper buckle is going to have an integrated whistle
- Two pockets on front below the air chambers. One for fishing lure box and the other for a knife, snacks, sun screen etc.
- Rear air chamber doubles as a nicely sized pillow.

Edited by dandydan on 01/28/2012 10:09:43 MST.

Keith F
(hamerica) - M

Locale: Northern Virginia
Re: MYOG Inflatable PFD on 01/28/2012 14:37:09 MST Print View

Looks great Dan! I really need to learn how to sew. How do you plan on testing this thing when it is done?

. .
(biointegra) - MLife

Locale: Puget Sound
Re: MYOG Inflatable PFD - Progress Journal on 01/28/2012 14:44:45 MST Print View

waterbarrel

How else?

. .
(biointegra) - MLife

Locale: Puget Sound
Re: MYOG Inflatable PFD - Progress Journal on 01/28/2012 14:47:39 MST Print View

Sorry for cluttering the thread, I couldn't resist.

Thanks for sharing this project, Dan. The photos are very helpful and the weight to feature ratio looks great!

I have considered a similar pursuit, but want to incorporate some solid foam for margin, as your original idea, if I can get it light enough. Your process is thought provoking.

Edited by biointegra on 01/28/2012 14:48:26 MST.

Dan Durston
(dandydan) - M

Locale: Cascadia
Safety on 01/28/2012 16:40:45 MST Print View

The difficulty with designing an inflatable or hybrid PFD is that partly comes down to safety vs. weight, so you need to choose a compromise that works with your intended use and risk tolerance. Even with a foam PFD, you face that compromise somewhat (ie. how much foam to put in?).

One question I've been asking myself is: "What would happen if it popped?"

It seems to me that if any one chamber popped, I would still be okay (with 'okay' defined as floating generally head up). If the back chamber popped, I'd likely float chest up, so hopefully my face would be out of the water (but maybe not). If one of the front chambers popped, I'd still probably float upright but with a tilt. It's good I will have two front chambers. The real danger would be if both front chambers popped (and not the back one). Then I'd be floating face down. I think I'm okay with this risk, since popping two separate air chambers in one swim seems quite unlikely, and even if it did I would still okay (I could clip out) unless I was knocked out too....so 3 bad things would have to happen at once for me to be in serious trouble.

With separate valves for each chamber, I will be able to test this out and see if it floats as I'm theorizing. If my PFD can indeed sustain any one puncture and still make a positive contribution to my floating head up, then I'm okay with that risk situation. However if I single puncture results in me floating face down, then I'm not sure I want that risk. If this ends up being the case, then I think I would link the three air chambers together (hose) so that if one pops, then the whole thing goes flat. Since I don't on any crazy creek boating, I'm okay with this risk. I'm going to keep it as 3 chambers for now, as having 2 out of 3 seems safer than having 0 out of 3, but I'll test that out when I can.

Dan Durston
(dandydan) - M

Locale: Cascadia
Testing on 01/28/2012 16:43:34 MST Print View

" How do you plan on testing this thing when it is done?"

Good question....the lakes are darn cold around here right now. Ideally I'd take it to the local swimming pool, but it's a pretty busy place and I'd look pretty ridiculous. I suppose it's either that, or wait until spring.....or poach someone's hot tub.

Keith F
(hamerica) - M

Locale: Northern Virginia
Re: Testing on 01/28/2012 18:36:42 MST Print View

Since when did anyone on this site care about looking ridiculous ;)

David Chenault
(DaveC) - BPL Staff - F

Locale: Crown of the Continent
re: MYOG PFD on 01/30/2012 19:22:58 MST Print View

Looks awesome Dan. My thoughts on the safety of three chambers matches with yours pretty well. Realistically, a PFD like yours would suit the vast majority of my packrafting just fine. I'm more interested in having something much smaller to pack than the weight savings (though saving ~10 oz is nice too).

Make sure the front chambers don't mess with the lap pillow.

Luke Schmidt
(Cameron) - MLife

Locale: The WOODS
Cool Project on 01/30/2012 19:30:33 MST Print View

Very cool project. I wonder if you could turn this into a side business if it works well. Liablity issues would be something to think about though.

Dan Durston
(dandydan) - M

Locale: Cascadia
PFD's on 01/30/2012 20:44:28 MST Print View

Things are coming along pretty good.

I got the back chamber installed. I put it on there with 3 lines of sewing and then I zig-zagged over top of the inner and outer stitching to really make it bomber:
PFD 4

I designed the back chamber so it's just high enough that it doesn't interfere with the pack raft backrest. As long as you don't inflate it too firm, you can't tell you're wearing it. It could be firmer than this pic though. Kinda funny looking...but effective.
PFD 5

I started putting the buckles on, but had to stop since I don't have all the edging in place yet. I've now decided I'm going to go with 3 buckles instead of 2, so one more will be added in the middle so it doesn't splay open when seated:
PFD 6

I made the front two chambers today, after redesigning them about 4 times. I'm still not sure they're going to be perfect, but I'm keep working away until they are. Tomorrow the valve glue will be dry and then I'll tape them to in place and see how it works before actually sewing.

As it sits now, I've got 9.7 lbs of float in the back and 11 lbs in the front. With the front flotation also a bit lower down, it should give me a nice lean back.

"I wonder if you could turn this into a side business if it works well."
Unlike most of the projects I've made (ie. cuben fly), I probably would make a couple more of these if people really wanted. Definitely not a permanently business though, as I get tired of making the same stuff pretty quickly.

Edited by dandydan on 01/30/2012 21:12:21 MST.

Dan Durston
(dandydan) - M

Locale: Cascadia
PFD Weight on 01/30/2012 20:52:12 MST Print View

Oh...with all three chambers and two buckles, this PFD is at 6.51oz. The rest of the edging (5g) and third buckle (8g) will take me to 7oz. I'll probably add another 0.5oz in pockets too. So I'm estimating 7.5oz finished weight.

Travis Leanna
(T.L.) - MLife

Locale: Wisconsin
Re: PFD Weight on 01/31/2012 05:13:50 MST Print View

Very cool! The estimated finished weight is awesome.

Not to be a negative nancy, but is anyone concerned with the legality of MYOG life vests? I only ask this because while packrafting Isle Royale, we were mildly harassed by a ranger who threatened to terminate our trip because we were in "glorified pool toys" (our alpacka rafts). He lamented that the boats didn't have some sort of coast guard rating. Luckily our inflatable PFDs were coast guard approved because he thoroughly inspected those too.
(full details coming soon hopefully)

Maybe you'll be in more remote places. Just a thought.

But great work! :)

John S.
(jshann) - F
Re: Re: PFD Weight on 01/31/2012 09:08:39 MST Print View

Yes, you have to take the risk of getting ticketed if wearing a myog vest.

Dan Durston
(dandydan) - M

Locale: Cascadia
PFD Legality on 01/31/2012 14:08:25 MST Print View

Perhaps the rules are different up here in Canada....I'm not entirely sure what the rules are because they don't seem to be enforced. I know a lot of people raft the mellower creeks/rivers around here without PFDs at all, so I'm not too worried about a MYOG PFDl. I'd only be concerned if I was in a motor boat.

Also, the funding for BC Parks has been cut back so much that I've never seen a ranger ever....so yeah I'll chance a $75 fee.

Edited by dandydan on 01/31/2012 14:10:40 MST.

Rob E
(eatSleepFish)

Locale: Canada
Re: PFD Legality on 01/31/2012 14:21:27 MST Print View

Just as a point of conversation, I believe it is a legal requirement to carry a certified PFD for packrafts, canoes, bellyboats, etc. in Canada. See http://www.tc.gc.ca/publications/en/tp511/pdf/hr/tp511e.pdf pages 22-23

"These requirements do not apply to inflatable self-propelled water toys
because these toys are not designed for use in open water. If you do choose
to operate these toys in open water, they will be treated as pleasure craft and
subject to the same strict rules."

Now, note the language says that "one PFD per person", and does not specific whether that PFD needs to be worn or not. Also, it does not say at what point a small body of water, such as a creek, becomes "open water".

Legality aside, I agree that the park services in BC are so underfunded and understaffed that I think the chances of being stopped are rare. In some instances you'd be more likely to be stopped by DFO officers, and I am not sure if they would inspect life jackets all that closely.

If anyone else has a more definitive sources for legal requirements for small self-propelled vessels in Canada I would be interested in learning the exact rules and definitions.

Edited by eatSleepFish on 01/31/2012 14:23:15 MST.

David Thomas
(DavidinKenai) - MLife

Locale: North Woods. Far North.
Re: PFD Legality on 01/31/2012 14:28:12 MST Print View

In the US, it could come up if you are on "Navigable Waters" and subject to Coast Guard inspection. Then lacking any of your required safety gear (signaling devices, lighting at night, PFDs, etc) could cause an issue as could design issues with the boat. Some states have requirements for children to be wearing PFDs as opposed to them just being on board. Required gear varies greatly with boat length, power/sail/paddle.

US National Parks sometimes have their own regulations and inspections for boats. GCNP comes to mind as being especially detailed with your hand sanitizer system inspected beforehand, your pottie weighed afterwards and certainly high-floatation PFDs being required to be worn at all times while on the water within the park.

Any PFD you wear (MYOG, factory, whatever) is better than the most approved PFD that you're not wearing. The biggest determiner of survival in a small plane ditching in Alaska is if you went out of the aircraft with a PFD on. You'll be incapable of helping yourself within minutes, but if you're bobbing around with your head above water 30-40 minutes later, the Coast Guard might save you.

If you don't get off a Mayday, a helpful Q to ask is, "Okay, I swam / washed up on shore - now what?" Consider that you might be in your paddling clothes, with your PFD and NOTHING ELSE. When I work for the USFS, they issue inflatable PFDs in blaze orange that are like a photographer's vest with little pockets all over. There's a mirror, space blanket, whistle, leatherman, cord, power bar(?) - they did a pretty good job of putting in the stuff you'd most want. I've since converted by factory PFDs with little zippered organizer pouches to hold that stuff. Since it's "modified" it might not pass an inspection but I can't imagine being led away in handcuffs because I have survival gear and SPOT in my PFD. At least not up here.

P. Larson
(reacttocontact) - F
Your PFD on 01/31/2012 20:38:47 MST Print View

I'll take one. I'm 6'0, 155lbs.