Primus No.154/3

Discussion in 'Primus No:54' started by Rangie, Nov 8, 2016.

  1. Rangie

    Rangie Subscriber

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    Hi Folks,

    Finally getting through some of the stalled projects :-({|=

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    What we have here is a Primus No.54 stove, sold as a No.154/3 Heater, with the copper reflector (reflector type 3, the "/3") and embossed aluminium tank heat-shield.

    It is shown in THIS 1935 catalogue as part of THIS illustration.

    The stove is an X7 1933 model and was bought fairly locally from a dealer who didn't know its history/where it came from (I think it was doing the house-clearance rounds actually).

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    It needed nothing other than a really good clean, the burner a blast-through, the NRV pip replacing and cup oiled to fire back into life. The patina is fairly even, it will get a light oiling and that suits me fine :content:

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    The reflector is in good condition and un-dented, likewise the heat shield.

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    What I did have to manufacture was the support for the brass heater bell.
    This took a little head scratching until I bit the bullet and threaded some 6mm round bar M6 coarse for a retaining nut and then shaped the rod around, following the contour of the bell.
    Height, I asked around a few folk with heaters for a nominal height but found varying distances. I settled for nominally the centre of the reflector, I can always shorten to angle it up a little.

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    I put the reflector in this orientation for easy access to filler/vent and pump :thumbup: :content:

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    Full-whack the tips of the flame-cone just enter the heater bell, I reckon it's ok and certainly belts out the heat!

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    Stove-wise, I sourced a set of feet the right shape/length and electrolysed/painted an old trivet to complete the set. Legs are a little shiny but hey, If I find a nicer older-patina set, I'll use them instead.

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    It runs beautifully and boiled 2L of water in a wide pan in under 6 minutes, equating to roughly 2Kw power. Possibly nipple undersized, unsure but I'm delighted with the way it runs.

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    Brian @kaw550red gave me a travel-cap so I could dismantle and transport in a case (Project Pt2, anon), but I haven't had the nerve to disturb the taper seal, this is to me the one flaw of the "50" series, give me a replaceable seal instead of relying on a taper for repeatability.

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    A really nice combination, the heater will see use this winter.

    Alec.
     
  2. janders

    janders Subscriber

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    Great stove and presentation @Rangie :clap:
     
  3. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Lovely job Alec, beautifully presented.

    John
     
  4. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Alexander. What a great fettle! I will need to come around to see your stove, and feel the glow.
    Best Regards,
    George.
     
  5. Tony Press

    Tony Press Australia Subscriber

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    @Rangie

    Thanks for the great presentation, Alec.

    Cheers

    Tony
     
  6. igh371

    igh371 SotM Winner Subscriber

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    @Rangie Good one, Alex, I've found this sort of heater much more effective to use in the garage than the Bialaddin type. I like your solution to fitting the heater bell on its support hanger too - sounds easier than trying to forge-shape the rod end as I have done:thumbup:
    Ian.
     
    Last edited: Nov 8, 2016
  7. Rangie

    Rangie Subscriber

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    @igh371 , Ian it certainly belts out the heat! I haven't done burn/fuel weight trials with an R1/Bowlfire, but in the back of my mind there's a figure of 1kw.

    In the AmbuCamper I use my mongrel AL15A with a quick-change system :content: an AL9 Hood/Burner for light/heat (300cp light) and an R1/steel gauze for heat alone. The R1 burner and 7" reflector put out a great amount of heat, more than enough for that small space :) however I digress...

    Now, this 154R in stove-config, I am getting reasonable repeatability on 2kw nom, down on the No.5 burners approx 2.6kw (George? @kerophile).

    Some idle calcs..... :content:
    2000ml = 2000g
    T Start = 18degC
    T Finish = 100degC
    T Diff = 82degC
    time = 5:50mins (350secs)
    Specific Heat of Water = 4.18J/g/degC

    Q = mass x constant x T Diff
    Q = 2000 x 4.18 x 82
    Q = 685520 Joules

    Power = Energy/time
    P = 685520/350
    P = 1.959J/s (Watts by any other name :content:)
    Or approx 4.6 BTU/h

    It may improve if I change the nipple, it may be that its slightly enlarged. I'm not that fussed however as it burns so nicely!

    Alec.
     
  8. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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    Hi Alexander, the calculations I did were based on fuel consumption and the max theoretical heat output possible for that volume of fuel:

    https://classiccampstoves.com/threads/calculated-stove-powers.9572/#post-92344


    https://classiccampstoves.com/threads/optimus-no-155-cooker.4460/


    You have calculated the heat received in the boiling water, and neglects heat used in vaporising the fuel, heat loss to air, and heat wasted in heating the stove and ancillaries.

    You are correct in the heat output from the Bowlfire being much lower, not suprising since it is just a modified pressure lantern.

    Best Regards,
    George.
     
    Last edited: Nov 9, 2016
  9. kerophile

    kerophile United Kingdom SotM Winner Subscriber

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  10. Rangie

    Rangie Subscriber

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    Ahaa, but of course!! Thanks George :oops: :whistle:
    Its the difference between BHP at the flywheel and at the wheels! :mrgreen:

    Looks like i'll have to get the scales out :content:

    Alec.
     
  11. Primuseum

    Primuseum Subscriber

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    :clap::clap::clap:Very, very nice!