Galley stove/ovens

<< First  < Prev   1   2   3   4   5   ...   Next >  Last >> 
  • 13 Jun 2021 09:24
    Reply # 10626827 on 1195343

    Water doesn't burn? Who knew?

  • 13 Jun 2021 00:32
    Reply # 10625105 on 10619885
    Anonymous wrote:We live in a (to put it mildly) risk-averse society!

    Insurance and lawyer run society... Insurance wants only to insure companies that can't be sued... lawyers are looking for new things to sue for. Or something like that.

    Note: not all insurance companies and not all lawyers

  • 12 Jun 2021 13:01
    Reply # 10622245 on 1195343

    Ethanol evaporates about twice as fast as water so an ethanol/water mixture would SLOWLY self dilute.  But if you are starting with >90% ethanol, it would not become an issue for a long , long time.    Evaporation rates are functions of temperature, pressure and surface area.  Maybe if you buy the ethanol by the gallon and have an old, half filled jug sitting around for a season, it might significantly degrade? Otherwise, even a 80/20 mixture should remain portent if kept in any sort of closed container. 

    Personally, I never liked alcohol cookers due to the inherent problem of the low energy density of alcohol.  I used to call it the gallon for a gallon rule.  It took a gallon of alcohol to boil a gallon of water (being hyperbolic of course)

  • 12 Jun 2021 12:53
    Reply # 10622196 on 1195343
    Anonymous member (Administrator)

    I have noticed that too, Annie, when there is less than a quarter left in the canister. However, I have not connected it with the idea that the fuel has become weaker. The glass matting-like stuff in the alcohol canister appears to have a strong wick-effect and thus spreads the fuel around in this material. As the canisters is nearing empty, the wick material will naturally turn drier and the stove will burn with less intensity.
    I might be wrong, but this is my conclusion about it.

    It takes a real fool to produce a run-away alcohol fire in that stove. Still, I have a fire blanket at hand, in addition to my 5-litre cans of water.

    Arne

    PS: In the specs for the Origo, it says that a canister takes 1.2l alcohol. With my 1l-bottles, it is natural to only fill with one litre. This lets me sail Ingeborg on her ear without fearing fuel spill, even if my stove is not gimballed.

    Last modified: 12 Jun 2021 19:15 | Anonymous member (Administrator)
  • 12 Jun 2021 05:09
    Reply # 10619885 on 1195343

    There appears to be an element of truth in the burners getting cooler with time.  But only an element.  I have discovered that if I want to cook chips, they cook better over a recently- filled cannister than one filled a day or two previously.  I won't even hazard a guess as to why.

    Pol, you are reading the instructions on a cooker, produced in the 21st century in Europe.  If you read the safety instructions on a battery drill, you'd probably never use one of those, either.  We live in a (to put it mildly) risk-averse society!

  • 11 Jun 2021 19:53
    Reply # 10618427 on 1195343

    This is a logical explanation, Arne. Using David's method of measuring the alcohol content, it would be interesting to try testing the fuel now and then for it's alcohol content.I have a feeling the alcohol will evapourate faster than the water, but it would be fun to test that. Certainly a wee dram (or fine Norwegian akvavit!) is best sampled shortly after pouring, whether diluted or not...

    Oh the fun I'm going to have with my new stove :)  

  • 11 Jun 2021 15:09
    Reply # 10617085 on 10617043
    Arne wrote:

    Still, I will keep this note in mind. Next time one of my burners run empty, I will dry the canister over low heat before filling it. I will also weigh the canister on my digital scales before and after the drying process.
    Too bad I have no ways of actually measuring the strength of the alcohol.


    https://en.wikipedia.org/wiki/Ethanol_(data_page) gives the density of the full range of volume concentrations from 0% to 100%. If you can measure a volume (with a 100ml plastic syringe?) as accurately as you can the weight by digital scales, you can establish the density and thence the concentration.
    Last modified: 11 Jun 2021 16:26 | Anonymous member
  • 11 Jun 2021 14:58
    Reply # 10617043 on 1195343
    Anonymous member (Administrator)

    Frankly, I don’t buy that explanation. ‘Cleaning alcohol’ is probably just some alcohol-water mix. Alcohol and water will not split in a tank (unlike milk and cream in un-treaded milk).
    I can only think of two ways that the alcohol in the canister gets weaker over time.

    • 1.      The (unpadded) canister of alcohol attracts moist from the air, which dilutes it.
    • 2.      The (unpadded) canister lets alcohol evaporate. If the alcohol is more volatile than the water, the water may not evaporate as fast, and then the alcohol contents will drop.

    In any case, I think this is most likely to happen if the stove is sitting idle for some time between use.
    My armchair, amateur guess is that this (diluting) process, suggested in case #1 or #2, will happen just as well with the pure 96% alcohol.

    Still, I will keep this note in mind. Next time one of my burners run empty, I will dry the canister over low heat before filling it. I will also weigh the canister on my digital scales before and after the drying process.
    Too bad I have no ways of actually measuring the strength of the alcohol.

    Btw...
    The reason why I think that the 80% alcohol is better on the Origo, is that this burner has limitations on the air-fuel mix. At full power there is simply not enough oxygen around to keep the flame blue (=full combustion). This means that some of the alcohol is only half-burnt, and the un-burnt part is soot. By reducing the strength of spirit to 80%, there will be fewer alcohol molecules searching for oxygen to react with, so this is like reducing the power setting. Maybe that would be just as good  -  reduce the power setting a little. This automatically leads to a leaner, and thus cleaner burn of the Origo, just because of the way that burner has been built.

    Arne

    PS: I can imagine that Annie Hill does not have problems with the burners getting weaker, since she uses her stove all the time


    Last modified: 13 Jun 2021 14:03 | Anonymous member (Administrator)
  • 11 Jun 2021 11:54
    Reply # 10616644 on 1195343

    Jan I think that is a victory! That cooker sounds like the sort of thing I'd avoid IF I read those instructions before buying!! Your fire sounds like one hell of a fright.

    I was outbid on the Origo 3000 on ebay. The winning bid was £420. There followed a moment's reflection. Thinking I'd consider buying the one listed at £660 - am I crazy?! - (which I saw only last week listed at over £800!), I dashed to the listing but it had disappeared so I can only guess that someone else, outbid as I was, had snapped it up. I did see it in the listings minutes before, so that is the only conclusion I can draw. High demand, limited supply... Hen's teeth! So I contacted the seller in the Netherlands, to ask if he would accept an offer on the brand new one that he has listed which ends in a week or so, but he declined on the grounds that there was a lot of interest in it. He did however offer me another, still to be listed, for the price I had bid on the one I missed. I went for it. A very fair seller.

    The reason I am telling this convoluted tale is that the seller says he buys these Origo 3000's from people who say that the heat from their burners has gradually reduced over time and eventually they give up on them. He says they have been using cleaning alcohol from the hardware shop, not 96% (I think) alcohol fuel. He told me that, after a putting the burner on a very low heat hot plate, he has evaporated the water built up in the burner (from the "cleaning quality" alcohol), and when refilled the burner works as new! So I'm puzzled that so many contributors to this story have been recommending diluting the fuel!

    As long-term propane burners, we will review the Origo when we have had some use of it. 

    Pol.

  • 10 Jun 2021 10:04
    Reply # 10612034 on 1195343

    Compass24 never responded to our emails about the fire onboard from their shoddy Origo3000 copy last year, but they obviously took on our feedback and the product description (this is not small-print, it's the main info!) now makes it quite clear that it is unsuitable inside or on a boat, and a fire is your fault for not following the instructions to the letter:


    Please observe the following instructions when operating the spirit cooker: -Don't operate the alcohol cooker unattended and never in closed rooms. -Make sure that the cooker cannot tip over and is placed on a fireproof base. -Make sure that the cooker has enough space on all sides, as the cooking pot deflects the flame and heat to the side. -Make sure that the stainless steel springs under the burner pots are high enough so that the burner pot is flush with the lid. -Check your camping cooker before each use for visible damage or other defects that could lead to malfunction. -Children should only stay near the cooker during operation under supervision. -Have fire extinguishing materials ready. A fire blanket or small fire extinguisher is best suited for this purpose. -Read the operating instructions and make sure that you operate your cooker in accordance with the manufacturer's instructions.

<< First  < Prev   1   2   3   4   5   ...   Next >  Last >> 
       " ...there is nothing - absolutely nothing - half so much worth doing as simply messing about in junk-rigged boats" 
                                                               - the Chinese Water Rat

                                                              Site contents © the Junk Rig Association and/or individual authors

Powered by Wild Apricot Membership Software