Shmel 2 with unusual burner

Discussion in 'Russia/USSR' started by presscall, May 23, 2021.

  1. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Here’s the burner.

    38341D27-62CF-4435-BFFE-29DB2906B764.jpeg

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    On the stove.

    153E2024-B7FC-4896-9736-1D3A892DBBCF.jpeg


    Alongside the burner more usually seen on a Shmel 2 (or Shmel 4 with this example).

    FCCE59B2-F9BC-4015-8B31-015EA0550E5B.jpeg

    A0710162-0332-4B33-AF5F-AD75F3C3B5A7.jpeg

    C22155F9-E3B3-413F-8205-B34BBF818C05.jpeg

    FBF47831-89AE-4DDE-A7E5-972895F4E9D4.jpeg

    74F1614B-93A1-4E96-81F0-D34CF976D138.jpeg


    A Shmel 2 with the latter type of burner more commonly seen on these stoves.

    F6F68D6C-1B17-4D7F-AA2C-EA7576AB9D39.jpeg


    In @OMC ’s useful compilation of Shmel facts and figures hiding in plain sight was the larger tank capacity of a Shmel 4 compared to a 2.

    It’s only when the two stoves are to hand that I’ve appreciated that the difference in tank diameter in particular is quite marked. Svea 123R in the line-up for comparison.

    15158F00-7B40-4F69-93D5-3B99521B76FB.jpeg


    Yet a Shmel 2 pump (top) has a longer stroke than that of the Shmel 4. That’s because the 4’s pump is mounted lower down than the 2’s is, evident in the photo above, and it has to be shorter to ensure clearance for the projecting NRV above the tank base.

    72C7B226-2359-45F8-8EC3-43FDB9AE46FA.jpeg


    Burner components.

    FB1FCF9B-03E9-48B8-8DA1-5237A53C9DC8.jpeg

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    As with the the Shmel 4, burner regulation and on/off control is achieved with the tapered lower part of the pricker block …

    003EF55E-E022-4EF7-BC2A-99A69734B49B.jpeg


    … mating up with the edge of the fuel passage beneath the pricker block.

    A5A885CD-D1E3-4CA8-89B4-92F571882F43.jpeg


    The consequence of that is that positive stop shut-off occurs at either end of the range of clockwise/anti-clockwise movement of the control spindle rotation. The control knob inscription however doesn’t reflect the either/or clockwise/anti-clockwise option for on/off (and regulation). The pricker’s at it’s highest point mid-way in the arc of movement.

    2B52F8DB-5EB1-4F96-84D0-1B8D038091CB.jpeg


    ‘OTKP.’ signifies ‘открыть’ (open), ‘3AKP.’ is the abbreviation of ‘Закрыть’ (close) and ‘ЧистKA’ means ‘clean’ (pricker activation).

    The burner has an excellent output and controllability.

    Simmer.

    929D79FB-340E-4BEF-B400-B3B4AC4CD32E.jpeg


    Max.

    DC45C05D-FAC6-4B97-997F-C1F19BD91F43.jpeg


    Aspen 4 white gasoline is the fuel.

    John
     
  2. Harder D. Soerensen

    Harder D. Soerensen Denmark Subscriber

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    Wow!
    I like that one!
    (Have yet to work on my Shmel like you showed me John - to improve controlability
     
  3. Bratok_xxl Russian Federation

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    Hi Prescall.
    This is Ukrainian made clone Shmel-2 by (МеталлоБыт) MetalloByt factory.
    They may have very poor quality made - like full burner foto =)
    But, for collector is nice found.
     
  4. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Bratok_xxl
    Thanks for the information. I’ve no complaints about the quality however. The burner is a good casting and the other parts are as well made as those on my Shmel 4.
     
  5. Bratok_xxl Russian Federation

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    You Lucky man =) 100% !!! But, if possible take Shmel 2 from Arsenal factory? and compare made quality =)
     
  6. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Harder D. Soerensen
    Funny thing, this Shmel 2 has the same mechanism as that on the Shmel 4 I worked on to improve its controllability but the burner is easy to regulate without that modification.

    Only thing I can criticise is the slight tilt from vertical of the safety release valve, which doesn’t affect its function though.

    870F064D-9DD2-47B0-94A5-EFC142DECE22.jpeg

    John
     
    Last edited: May 26, 2021
  7. Aleks-S

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    This is indeed "Shmel-2", produced by the "Arsenal" plant in Leningrad, Russia (CCCP).

    "Tourist's Primus" produced by the "Metallobyt" (Dnepropetrovsk, Ukraine (CCCP)) plant is really looks similar to "Shmel-2". But "Tourist's Primus" had no model name, either in the documents not on the fount, os somwhere. In the operating manual, it was called simply "Tourist's Primus".

    For brevity, I will call it MB-2 (*)

    "MB-2" differs from "Shmel-2":

    1) The fount is painted with gray hammer paint. "MB-2" had no other colors.
    Founts of "Shmel-2" have never painted in gray paint.

    2) "MB-2" have stamping of the bottom of the fount in the form of circle.
    "Shmel-2" have a triangle stamping.

    3) "MB-2" has a fully brass pump. The handle is round. Similar pumps were equipped with "Shmel-1" (**)
    But the entire line of "Shmel-2" pumps had a rectangular handle made of aluminum alloy. The pump nut of "Shmel-2" was also made of an aluminum alloy.

    4) The bell of "MB-2" is fastened with a nut.
    "Shmel-2" - soldered (not always (***))

    MB-2-1.jpg MB-2-2-fount-bottom.jpg Shmel-2-3-fount-bottom.jpg MB-2-4-nut.jpg MB-2-5-nut.jpg

    These are the most visible differences. There are others.
    For example, а sticker on the fount with an inscription "Шмель 2".

    Your "Shmel-2" model is transitional and very rare.

    The very first model of the "Shmel-2" had a flat-topped fount and a triangular WHP. But the burner was the same as that of the "Shmel-1" with a gearwheel on the spindle and a toothed rack (burner thread M14x0.75mm).
    Apparently, they used stocks made for "Shmel-1".
    This modification is extremely rare.

    To simplify and reduce the cost of production, soldering was eliminated and the manufacture of the control mechanism was simplified. This is how a cast burner with an eccentric on the spindle and a conical valve element (burner thread M14x1mm) appeared.
    (Presumably, the burner was molded into a mold where the upper part of the burner was previously placed. I'm talking about the burner that I have. The burner you have was obviously made differently).

    The user manual was accompanied by an insert with the text of "the appeal to the user" - "Uvajaemyi tovarishch, Your stove is equipped with a newly designed burner with eccentric control..."
    Vkladish-6.jpg
    But the asymmetrical arrangement of the lower holes in the burner led to overheating on one side of the burner. And after many heating-cooling cycles, the top of the burner gradually came off.
    The production of such burners was quickly discontinued.
    Shmel-2-7-burner-came-off.jpg
    The shape of the bell became tapered again, but with oval holes instead of "keyholes". But the thread remained M14x1mm. And also mechanism with an eccentric and a cone was left unchanged.
    (Afterward, the cone was subsequently replaced with a separately dangling ball - for simplifing production).
    -----
    * - there is a stove "Pchelka" ("Пчелка", means little bee ) produced by the "Metallobyt" plant , very similar to the "Shmel-1.
    Outwardly, it is easy to distinguish it by the shape of the dish supports.
    Pot-stands.jpg
    In my terminology, it would be MB-1, because in some cases, the model name was not indicated anywhere (nor on the fount, nor on the case-pot, nor in papers) - in the operating instructions it was simply called "Tourist's Primus".
    Its bell is also screwed on with a nut. MB-2-8-nut.jpg

    This is a distinctive feature of the stoves that the "Metallobyt" plant produced.

    ** - "Shmel-1" is actually called just "Shmel" (without any numbers). In everyday life, begans to indicate a number in order to clearly distinguish it from subsequent models. Since when one say, for example, "...my Shmel..." - it can be any model (also 2, 3, and 4).

    Shmel-doc1.jpg Shmel-doc2.jpg Shamel-2-manual.jpg Shmel-2-doc1.jpg

    *** - in some :Shmel-2" models, the burner is not soldered, but just pressed in. Also - for simplification of production. After many cycles of heating-cooling, the thermal contact between the bell and the burner deteriorate, and the stove starts to work badly.
    Such burners have a hexagon in the bell - imitation of a nut.
    Shmel-2-1983-nut.jpg
     
    Last edited: May 27, 2021
  8. Aleks-S

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    ...
    4) The bell of "MB-2" is fastened with a nut.
    "Shmel-2" - soldered (not always (***))
    ...
    *** - in some :Shmel-2" models, the burner is not soldered, but just pressed in.
    ...
    Mean brazed, of course
     
  9. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Aleks-S
    I’m very grateful for that wealth of information.

    John
     
  10. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    It won’t get regular use,
    but thanks for the warning. Ok so far!

    C788FBB0-2D39-48C6-8967-7CE0DAB2FDEC.jpeg
     
  11. Aleks-S

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    My pleasure, sir. :content:
     
  12. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    See THIS post for further information and comparison with ‘post-transitional’ burner equipped Shmel 2.

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    … featuring an instruction leaflet with illustrations of the ‘transitional’ burner.

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    3FF76293-2B1D-473C-B13B-20DD68F27100.jpeg
     
  13. Harder D. Soerensen

    Harder D. Soerensen Denmark Subscriber

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    @presscall
    As always - a fountain of well-documented knowledge. Thanks for sharing John!
     
  14. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Harder D. Soerensen Thanks Harder, but I’m indebted to @Aleks-S for his expert knowledge. In isolation, I’d just be a bloke with some camp stoves. CCS offers an international forum where there’s a pool of knowledge to draw on. This was a case in point and it made my day!

    John
     
  15. Aleks-S

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    This "expert" very grossly "missed".:oops:

    This info about manufacturing location and name of plant are incorrect.
    Correct info see here
    Shmel 2 clone, Ukraine
    @Bratok_xxl , cпасибо большое, что заметил и прояснил! Thank you very much!
    And I should have taken a closer look at the text on the pictures of the manuals / instructions that inevitably caught my eye when digging for that which published.