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Thread: a burning question

  1. #1
    Member Pengy's Avatar
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    a burning question

    This one is for you people that took notice at school.
    A mate has been looking into options for lightweight stoves for a quick brew up on hunts. Hexamine fuel tablets are what he is keen on, in conjunction with a small billy etc.
    I ran few tests with some combinations today to see how these stack up against my alcohol burner. I was under impressed with hexamine tabs burning out long before the water boiled. I used the small blocks that came with another stove. Four blocks burned for 14 mins without achieving a boil
    Mate then tells me that a retailer has informed him that the Esbit hexamine tabs in 14gm are much better than the smaller 4gm models and that one 14 gm block will burn more efficiently than x4 4gm blocks.
    This logic has me beat. What he is suggesting is that if I burn a log in one piece it will be better than if I cut the same log into four.
    What do the experts say
    Forgotmaboltagain+1

  2. #2
    Sending it Gibo's Avatar
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    I say hes probably correct. If you get the fuel, air, heat mix correct you will be expelling more of the flammable vapour from the fuel. Hence more heat. Look at a simple fire, a single log will not put out as much heat as many logs. Same principal, more fuel, more heat......That is assuming it has sufficient air to burn at its potential.
    Last edited by Gibo; 12-06-2014 at 04:16 PM. Reason: Not an expert

  3. #3
    Member gadgetman's Avatar
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    Depends what you want. A log will burn longer whole. Once split it burns quicker and producing heat at a faster rate.
    Munsey likes this.
    There are only three types of people in this world. Those that can count, and those that can't!

  4. #4
    Member Pengy's Avatar
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    Yeah that was sort of my thinking too. Split log or multiple sources allow more oxygen circulation.
    In fairness, the guy has not qualified what HE regards as efficient. I would have thought for the purpose of boiling a billy a faster burn generating more heat would be better than a slow, long burn
    Forgotmaboltagain+1

  5. #5
    Sending it Gibo's Avatar
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    Quote Originally Posted by Pengy View Post
    Yeah that was sort of my thinking too. Split log or multiple sources allow more oxygen circulation.
    But producing less heat. And burning out faster.......it would be a case of finding out the boil time to get optimal size?

  6. #6
    Member gadgetman's Avatar
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    And the old one candle will never boil a pot of water scenario. The losses equal the heat input before the water is boiling. You need more candles.
    veitnamcam, Munsey and Gibo like this.
    There are only three types of people in this world. Those that can count, and those that can't!

  7. #7
    OPCz Rushy's Avatar
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    Quote Originally Posted by gadgetman View Post
    Depends what you want. A log will burn longer whole. Once split it burns quicker and producing heat at a faster rate.
    The amount of energy in the log remains the same. It is just how quickly it becomes released (split burns quicker).
    veitnamcam likes this.
    It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
    What more do we need? If we are above ground and breathing the rest is up to us!
    Rule 1: Treat every firearm as loaded
    Rule 2: Always point firearms in a safe direction
    Rule 3: Load a firearm only when ready to fire
    Rule 4: Identify your target beyond all doubt
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    Rule 7: Avoid alcohol and drugs when handling firearms

  8. #8
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    When a log burns the charcoal works as an insulation slowing the burn rate, hence big timber beams in buildings last long than steel before collapsing. The mandarin restaurant in Auk burnt down many years ago. The laminated structural beams in the form of hockey sticks to form the structure, were sand blasted after the fire and reused!
    Boom, cough,cough,cough

  9. #9
    Almost literate. veitnamcam's Avatar
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    Its the ash that insulates, how they do the fire walking thing, damp feet and a good layer of ash.
    Bet you wouldn't get anyone to walk the pit after you had just spruced it up with a leaf blower!

    The larger pellet could well boil the billy better than 4 small ones, the 4 small ones could be hotter but loose most heat to atmosphere while the larger pellet provides enough heat to overcome losses but burn long enough to achieve boil.
    Pengy likes this.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

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    == Charring and fire protection ==

    Charring is an important process in the combustion ignition of solid [[fuels]] and in [[smouldering]]. In construction of heavy-timbered wood buildings the predictable formation of char is used to determine the [[fire rating]] of supporting timbers and is an important consideration in [[fire protection]] engineering. If a wood column is of large enough diameter, during a structure fire its exposed surface will be converted to char until the thickness of char provides sufficient insulation to prevent additional charring. This layer then serves to protect the remaining structurally sound core of wood, which can continue to carry the building loads if appropriately designed.
    veitnamcam and gadgetman like this.
    Boom, cough,cough,cough

  11. #11
    Sending it Gibo's Avatar
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    Whats that got to do with hexamine tablets professor maca?
    Pengy likes this.

  12. #12
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    Quote Originally Posted by Maca49 View Post
    == Charring and fire protection ==

    Charring is an important process in the combustion ignition of solid [[fuels]] and in [[smouldering]]. In construction of heavy-timbered wood buildings the predictable formation of char is used to determine the [[fire rating]] of supporting timbers and is an important consideration in [[fire protection]] engineering. If a wood column is of large enough diameter, during a structure fire its exposed surface will be converted to char until the thickness of char provides sufficient insulation to prevent additional charring. This layer then serves to protect the remaining structurally sound core of wood, which can continue to carry the building loads if appropriately designed.
    He only wants a cup of tea, not burn the forest down...or his house
    gadgetman and Gibo like this.
    Which is worse, ignorance or apathy...I don't know and don't care.

  13. #13
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    Read the first post, one log or split into bits, geeze guys just trying to pass some interesting info on, I really don't know, I have trouble with those little blocks producing enough heat to run my model steam engines, so fuck them I use meths, it has a nice smell, burns with heat and not bad to drink!
    veitnamcam, Pengy and Gibo like this.
    Boom, cough,cough,cough

  14. #14
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by Maca49 View Post
    == Charring and fire protection ==

    Charring is an important process in the combustion ignition of solid [[fuels]] and in [[smouldering]]. In construction of heavy-timbered wood buildings the predictable formation of char is used to determine the [[fire rating]] of supporting timbers and is an important consideration in [[fire protection]] engineering. If a wood column is of large enough diameter, during a structure fire its exposed surface will be converted to char until the thickness of char provides sufficient insulation to prevent additional charring. This layer then serves to protect the remaining structurally sound core of wood, which can continue to carry the building loads if appropriately designed.
    Well yes but charing is different to a burning coal. Its all about oxygen access.
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  15. #15
    Member Spook's Avatar
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    Quote Originally Posted by Maca49 View Post
    Read the first post, one log or split into bits, geeze guys just trying to pass some interesting info on, I really don't know, I have trouble with those little blocks producing enough heat to run my model steam engines, so fuck them I use meths, it has a nice smell, burns with heat and not bad to drink!
    Make sure you run it through bread...that dye will kill you
    Which is worse, ignorance or apathy...I don't know and don't care.

 

 

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