The Evolution of a Winter Stove - Part 3
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Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Re: Re: Re: Re: Re: re: pre-heating designs on 02/17/2014 13:46:53 MST Print View

Oh, the oil on the jet is liely to look clean. It is just a much higher hydrocarbon from unrefined gas.

> Using a hand lens at least some of the stuff blocking the jet appeared to be very
> find silver colored flakes... could be aluminum from the thread cutting?
> But there was also darker stuff that look more like dirt...
Yeah, I would say a bit of both.

> Any idea what the safest canister fuel is for being clean?
Depends on what is available. Have a close look at the canister for the 'Made in XXX' mark. Most of them do have this. If the canister says where it is made (Korea, France, anywhere but China) then it is probably OK. If it says China or does not say, I would be suspicious.

Interesting note: the Powermax canisters do not say where they are made, but they ARE clean.

Cheers

Bily Ray
(rosyfinch) - M

Locale: the mountains
Re: Re: Re: Re: Re: Re: Re: re: pre-heating designs on 02/17/2014 14:19:30 MST Print View

Roger... all my canisters say Made in Korea.

So it would seem that the blockage was from not enough cleaning of the stove on your end before shipping.

In any event I have not had another blockage since pulling it apart and cleaning the jet... (and using the same canisters).... yet.

I did try your suggested coffee filter paper as a filter. But I don't think it works very well. Looked at it after using the coffee filter circle for a while and it looks to me like the pressure of the fuel entering at one side of the jet socket just pushes past the edge of the coffee filter paper circle.

What was wrong with the toilet paper filter anyway? Why did you suggest go go away from that?

Billy

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Re: Re: Re: Re: Re: Re: Re: re: pre-heating designs on 05/01/2014 01:01:44 MDT Print View

Hi Billy

Sorry - I was away.

> What was wrong with the toilet paper filter anyway?
I found that if one used a shade too much TP and poked it in the hole a little to enthusiastically, it could wad up and partly block the jet. That is, the TP became as bad as a small bit of 'stuff' for blocking the jet. The disk of filter paper does not do that.

If the filter paper looks as thought he fuel is bypassing it, try a very slightly larger diameter of filter paper. All I can say is that it has been working fine for me.

Cheers

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
An UPDATE - success on 05/01/2014 01:04:18 MDT Print View

Hi All

Herewith an update on progress with completing the latest batch of stoves. To explain
why: I still have some unfilled orders from enthusiastic beta-testers who have paid up front some time ago despite being told that there would be a delay due to my CNC machine dying and having to be rebuilt. My thanks to those people for their long-suffering patience.

I started to rebuild all the electronics on the the CNC, but a series of domestic
problems slowed me down. Our grey water dispersion system died (we live on a farm) and had to be rebuilt; a storm took the roof off our chook shed so it had to be rebuilt; our elderly LandCruiser suffered a pulley failure and there were NO spare parts left in Australia (we got the original pulley manufacturer in Japan to make one to the original specs), plus a few other small delays. Murphy strikes! But all of these have been solved. Hopefully, not too many more will happen.

The electronics for the CNC have now been completely rebuilt from scratch and have been tested. There were a few hiccups along the way as might be expected, but nothing
serious. As far as I can see it is now running again and I will soon be finishing off
the next batch of stoves. I HOPE!

To recapitulate: so far I have shipped
batch 1: 10 stoves with FMS-116T burners (all gone)
batch 2: 27 stoves with FMS-300T burners
batch 3: 22 stoves with FMS-300T burners
batch 5: 9 stoves with FMS-300T burners
batch 6: 8 stoves with FMS-300T burners to the 6th annual GGG
I still have some FMS-300T burners for the next batch, but my stock of them is fast
running down.

Cheers

jerry adams
(retiredjerry) - MLife

Locale: Oregon and Washington
Re: An UPDATE - success on 05/01/2014 07:16:02 MDT Print View

wow! That's a lot of stoves, good job!

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Another UPDATE on 05/09/2014 18:42:02 MDT Print View

Machine rebuilt and running.
Parts machined for remaining orders, plus a few spare.
Orders all shipped.
Kossie029 Stove In Use
In mountains a week or two ago - dinner coming.

Cheers

Adam Kilpatrick
(oysters) - MLife

Locale: South Australia
Re: Another UPDATE on 06/29/2014 02:28:26 MDT Print View

We are thinking of doing the GR10 next year around August, carrying our little girl (will be a toddler by then so will walk the odd km).

I really should have gone for one of your stoves when I had the chance Roger! Any chance there are some still available, or in the pipeline? If so, put me down for one.

Cheers!

Douglas Frick
(Otter) - MLife

Locale: Wyoming
Re: Another UPDATE on 06/29/2014 10:18:55 MDT Print View

Melting snow at Camp Muir (elev. 10,080 ft / 3,070 m) on Mount Rainier (Washington, USA), on a warm afternoon. The Caffin stove worked well, as usual. Mount Adams is clearly visible on the left, and Mount Hood (in Oregon) is in the distance just to the left of the pot. The pot is an Olicamp XTS (7.7 oz / 220 g), which weighs twice as much as my normal Stanco grease pot (3.8 oz / 110 g), but I thought the heat exchanger base would be worth the difference in case of high wind. This pot also fits over the FMS-300T supports perfectly, so it doesn't slide off.



Caffin stove melting snow at Camp Muir

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Re: Another UPDATE on 06/29/2014 16:06:03 MDT Print View

Hi Adam

Contact me direct roger@backpackinglight.com
Not many burners left now. Dunno what after that.

Cheers

karl hafner
(khafner) - MLife

Locale: upstate NY
caffin winter stove on 07/24/2014 06:51:29 MDT Print View

I received your winter stove with the 300 head. Quality control is excellent. The build construction is beyond what other stove makers do. It works as advertised and is so very light. ( This from a guy who has used an XGK from its inception). Can't say how it works in the real cold - we are in summer here but from how it is built and works in the warm weather it will be great. If I had to state a negative its the light weight - it can move around and should be anchored. Thanks for a state of the art winter stove.

John Klinepeter
(johnzotk) - MLife

Locale: Northern Rockies, USA
Pay It Forward O-Rings on 08/12/2014 15:49:17 MDT Print View

PIF O-Rings

Skip to the bottom if you want to bypass the boring details. Yes, free 0-rings!

I like to carry a reasonably complete repair kit. Having recently received one of Roger Caffin's winter stoves I set out looking for a set of o-rings. I found nothing metric at the local big box hardware store so I went online and found a couple of sources. The first source had very large minimum orders, the second source required orders that were quasi-reasonable. So, I ordered from #2 and for about $25 I have more than a lifetime supply for one person. Better that they be used than be passed on to my heirs,

I would like to give away the following kits to BPL members and lifetime members.*
Viton Fluoroelastomer composition in these sizes:
Quantity one 7 X 3 mm inside diameter X thickness
Quantity two 5 X 1.5
Quantity one 3 X 1.5
Quantity one 3 X 2.0
Total five pieces.

Trivia: Different vendors seem to specify the sizes differently, i.e., some refer to the outside diameters of the four rings which are 13, 8, 6, 7 mm, respectively. The vendor from whom I purchased specified the "7 X 3" as "3 X 7" on the packaging.

From the Stove Manual: "The O-rings are usually Viton (but see Extreme Cold). The ‘big fat’ O-ring visible in the canister connector is an OR7x3 size. The O-rings inside the canister connector body, on the hose end and on the white valve, are both OR5x1.5 . The small O-ring sealing the hose into the stove body is an OR3x1.5 . The O-ring on the needle valve seems to be an OR3x2."

The o-rings were received in quantities of 25 except for the 7 X 3 which arrived in a 10 pack. I would like to keep 3 sets for myself, so the first 7 requests will get the full complement and the succeeding 2 requests will receive the three smaller o-rings only. The last 13 requests will receive the 3mm I.D. o-rings only. Hope I did the math correctly!

I have not completely torn apart the stove to verify that what I have is in fact what is needed. I did measure some but not all the o-rings in the stove itself but have not put a caliper on the replacements. Faith!

I advise feeling the package contents to locate the o-rings before cutting it open along the edges. Don't want to damage an o-ring! Comes with a small zipper baggie for storage. Use some care if you rip it open or you may experience something akin to a potato chip bag explosion.

*PM your address to me and I will send them to you via USPS. Limit one set per person. USA addresses preferred, please, but I will not exclude anybody unless the shipping cost is outrageous. FWIW shipping in an envelope stateside costs $0.70. Looks like international shipping is $1.36 to Canada and most places (?) out of the country. The stuffed envelope weighs less than 0.5 ounce.

Edit Update: All of the complete sets have been claimed. Partial sets are available.

Edited by johnzotk on 08/12/2014 20:58:15 MDT.

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: caffin winter stove on 08/12/2014 18:12:38 MDT Print View

Hi Karl

> If I had to state a negative its the light weight - it can move around and should be anchored.
I agree entirely, that it is so light it can move around!

These days I use 3 very small Ti wire stakes to anchor the legs in position, either on the ground or on a small 3-ply base plate (eg on snow). This is shown in one of the pictures in the 2nd or 3rd article I think.

Cheers

Roger Caffin
(rcaffin) - BPL Staff - MLife

Locale: Wollemi & Kosciusko NPs, Europe
Re: Pay It Forward O-Rings on 08/12/2014 18:14:29 MDT Print View

That is very kind of you John!

Cheers