Perfektus No:10

Discussion in 'Ernst Hãhnel' started by Spiritburner, Feb 6, 2010.

  1. Spiritburner

    Spiritburner Admin SotM Winner Subscriber

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    A 1 pint paraffin stove with some nice detail & a great tin. The NRV was unusual in that it required a 10mm socket to remove. It does have a slot but too thin for any of my screwdrivers that were long enough to reach. The storage cap to replace the burner intransit looks home-made & actually makes the stove a little too tall for the tin.

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  2. Stoveuser

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    Cool!
    And the tin is fascinating. I`m not sure if I would use a stove in a boat as on the drawings, but taking it to the raceway looks kinda cool.

    Best regards
    Stoveuser
     
  3. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Ross. Lovely Perfektus stove beautifully presented.
    I think it would be very unusual for a collapsible stove to separate at the level of the burner/spirit-cup rather than the tank top....if you leave the riser attached to the tank you could never make the reserve cap thin enough to prevent fouling of the top of the storage tin.....

    Look at the reserve cap arrangement on Nick's Perfektus No.0:

    https://classiccampstoves.com/threads/10757

    What are your thoughts?

    Best Regards,
    Kerophile.
     
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  4. Gordon F

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    Yes, a lovely stove there Ross.

    I think George is correct in his thought that the burner and riser should come away in one piece, but that riser looks to be soldered in place.

    Perhaps some one had a leak of fuel there, and the easiest solution was to solder it.
     
  5. Spiritburner

    Spiritburner Admin SotM Winner Subscriber

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    I agree - it's unusual.

    Not unique to this one though but can't recall all others at the mo to bring to the debate. Parasene was one.

    I am as certain as I can be that the riser is as it should be. All the literature on Perfektus I have shows different variants of the 10 to this one. Those show a conventional burner with a nut on the bottom of the riser screwing direct into the tank. They are not this stove though as they differ in other features as well.

    The other 10 in the SRG is different.
    https://classiccampstoves.com/threads/766

    The reserve cap in the spares diagrams & on this example (parked on the filler cap) looks thinner than mine (which also has a chunky washer). Maybe this is what mine is missing. There is nowhere to park it however. That may lead you to suggest the filler cap isn't original but unlike the other 10's (in SRG & catalogues) mine doesn't have the pressure release on the side of the filler boss

    Some of their bigger collapsibles had a short riser on the tank & a short riser under the spirit-cup.

    Of note is that the claw feet are later. In 1935 they had conventional feet like a later Optimus 00 but by 1938 the claw feet came in.
     
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  6. shagratork

    shagratork United Kingdom Moderator, R.I.P. Subscriber

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    The RM collapsible in this brochure (image 003) has the same arrangement as Ross's Perfectus.
    Note that the RM does not have a reserve cap on the riser tube.
     
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  7. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Ross and Trevor, you make a fair point, although I think the RM arrangement is for transportable stove rather than one intended for regular collapsing. I could see your stove "eating" washers if you have to split it at the spirit-cup every time you want to put it in the box.
    Ross, what can you see when you look down the riser tube? If the riser appears to be screwed to a threaded fitting on the top of the tank, this might argue for a demountable riser....

    Nice stove anyway.

    Best Regards,
    Kerophile.
     
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  8. Spiritburner

    Spiritburner Admin SotM Winner Subscriber

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    Not got it in front of me but I did look down the riser & there's nothing I can see that indicates that it's screwed to the tank.

    I'm not disagreeing that it's maybe a flawed design but it looks pukka to me. And as I've seen this design before I'm not inclined to agree it's not original.

    The washer is holding up pretty well - it's helped by the fact it's protected from spreading by the spirit-cup.

    https://classiccampstoves.com/threads/11308

    https://classiccampstoves.com/threads/849

    Label shows same design - can't see if the stove does from the pics:

    https://classiccampstoves.com/threads/9424

    https://classiccampstoves.com/threads/13191


    In the example linked by Trevor - that model was available at some point with a tank-fixed riser & a short riser under the spiritcup - maybe RM realised it wasn't a good idea.
     
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  9. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    I think you'd just see a hole, George, and a dark one at that.

    I'm going on recent experience with an internally-threaded riser tube fitting (more like a boss, really), itself screwing into a tapped hole in the tank in the case of that fuel supply tube repair I did on Alan's Monitor.

    Monitor fuel supply tube fix

    You've got to love CCS for discussions like this!
    (along with all the other stuff)

    Cheers,

    John
     
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  10. igh371

    igh371 SotM Winner Subscriber

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    Thank goodness for Ross's note at the beginning of this posting about the peculiarities of the NRV set up! Just been busy with the remnants of an old Perfectus '0' and had looked down the pump tube only to see an already mangled screwdriver slot in the NRV top :cry: . But then following a hunch I found Ross's mention here of being able to use a 10mm socket - and a 10mm Metrinch socket turned out to be the most perfect fit imaginable - job now done :D ! (Well, that part of the job ... )
     
  11. Harder D. Soerensen

    Harder D. Soerensen Denmark Subscriber

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    Hi there
    An old friend of mine dumped me (in anger) today what turned out to be a Perfektus 10 which wasn't working for him. - fettled a bit with it and got it going - sort of

    I cannot tighten the green marked connection. It has no washer, so I tried both a fiber and a lead washer from my Primus spare parts. Because the diameter of the burner tube is app. 1.5mm smaller than the Primus tube, it will just squeeze out the washer, which will cause a vapor leak and most often a small flame in this encircled area.
    I have tried to clean the two connecting parts - but all in vain.
    Q.1: Does anyone know where to get washers for this smaller diameter ?

    Q.2: There seems to be a very very tiny little hole in the blue circled area of the burner head. Can I get a spare roarer for this Perfektus - again the inner tubes diameter is to small to fit a Primus roarer.
    Or should I visit Billy the Blacksmith and have the area soldered?
    (Or making it disappear or turn into something strange by telling my son “don't ever touch that stove in my shed son” and then leave the shed unlocked)

    Best regards
    Harder -the Perfektus 10 non-enthusiast at the moment :lol:

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  12. Tony Press

    Tony Press Australia Subscriber

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    @Harder D. Soerensen

    1. Check The Fettle Box for washer sizes (link on this website). If they don’t have the correct size you can ask them whether they can make you some. I would use two washers, one above, and one below the priming cup.

    2. Get that hole brazed (silver soldered). It is an easy fix. If you don’t have access to someone who can do that, there are Members here with those skills. I can do it for you, but I’m a long way away.

    Cheers

    Tony