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Mk4 Airsporter Preload

Discussion in 'Technical' started by Cinimod, Aug 16, 2021.

  1. ajohn

    ajohn Chewing Things Over

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    @paj Seems to mean no2 bore, the USA probably stuck with sizes. I've mentioned engineering thoughts about mm when all were using imperial ;) before so wont again.

    I have some No2 wasps, 14.4gn, measured myself. The tin is marked No2 (22) 5.6mm. They will just have rounded 5.588mm. Wasps to me means light so something called Pylarm might be heavier. Hornet to me suggests light as well.

    At least the inch became 25.4mm in 1930 ;) but rather close before.

    You might find the book it came out of on the wayback machine / internet archive library but it looks like it's been removed.
     
  2. ajohn

    ajohn Chewing Things Over

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    Another extract
    USAtest.jpg
     
  3. paj

    paj Busy Member

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    Hi ajohn, I'm pretty sure the BSA Pylarm were Eley Wasps. I used both years ago. Interesting extract, nice to see someone giving credit to the Airsporter design which, whatever you think about it, was avant garde at the time and the comments on the power of the German rifles.
     
  4. landymick

    landymick Big Poster

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    Yes the same as Wasps , Eley also made pellets marketed as Webley .
     
  5. ajohn

    ajohn Chewing Things Over

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    It's how they have taken markets over. Cheap and nasty against expensive well made and good. I've compared a BSA smallbore target rifle with a German one. In terms of accuracy not good at all but a lot cheaper.

    I suspsect those power levels stated are about what my S Airsporter and MkIII give. I measured it a while ago but can't remember numbers. Both 177 and I probably used 7.33gn. This is as they came. Not done anything with them yet and may not.
     
    paj likes this.
  6. welshwilly

    welshwilly Engaging Member

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    Hi Dom. People tend to ram a big spring into the BSA Airsporter & Mercury, there is no need for such long springs. I find when a big spring is fitted it becomes a b****r to cock and the firing cycle is harsh & will shake everything loose.
    The lands on the Titan are wider than the std BSA spring, thus giving you high power but with a shorter spring. Titan springs I find are a hard spring especially when you have to cut them.
    The coil length I quoted you is the length I use in the WW kits, On average with a WW kit a good seal and buffer fitted the Airsporter with not much effort will reach 10.5 + ftlbs, Mercury's will be higher power.
    I Set up the BSA's with RWS SuperDomes as I find these the most consistent pellet for this rifle.
    Regards
    Will.
     
    paj, Cinimod and Byronic like this.
  7. ajohn

    ajohn Chewing Things Over

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    It's ok saying Titan springs but which one?

    The Airsporters can go to FAC levels. I spent ages looking for one and saw one for sale in Ireland stating FAC. I had to buy via RFD transfer initially to Knibbs and he asked about that aspect suggesting they crop up and mentioned why not buy one of theirs. ;) Bit of a price difference as his are rare models. Mine looks like it was kept in a gun cabinet. Good bluing but chipped at the end of the barrel. I wouldn't say mine or my MkIII shoots roughly. Cocking effort was a bit hard but when ever I get a spring gun I usually find that for a while then it eases more down to getting used to doing it and probably a bit of an increase in muscle power.

    Other than some one mentioning Airsporter springs from Protek I would have bought this
    https://www.airgunspares.com/gunspa...porter-mk-1/160672bsaasmercurymainspring.html

    I've mostly rebuilt a Gamo CF20, another gun with a tap. It had been cadetified. No piston weight and a longer spring. Rather low power. So added the piston weight and even though that added a lot of preload it didn't make much difference so bought 2 possible Titan springs. Not liking to waste money I thought try the cheap standard spring first so did. More power but adding 1/2" of preload hardly changed it so took that out. Then as I had some for some reason I tried BSA Elites in it. 11.5ft lbs against 10 and a bit. Thinner skirt pellets and maybe softer lead. Same might happen on any gun with a tap.
     
  8. welshwilly

    welshwilly Engaging Member

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    The power was lower on the German rifles due to the German gun law only allowing a max power level of 6 ft lbs 7J. The British gun laws didnt have a power limit set to 12 ft lbs until 1969, so what year was this published ? The Likes of HW / Diana at the time were imported into the UK @ 6ft lbs, it was only in later years that HW was able to fit springs for specific markets like UK up to 12ft lbs.
    I think the build quality on the German rifles back then was much better than the quality they are selling now, that goes for the majority of gun manufacturers IMHO

    When you bought your rifle from Ireland all their guns are classed as FAC, you have to own a FAC to purchase anything over 1ft lbs over the water.

    As For Titan springs. No 1 For the BSA's and for a gamo Titan No 5 The CF20 has a pop up breech and as long as the seals are good shoot sweet, shame BSA couldnt put a seal in their tap, that would stop a lot of leaks.
     
    paj likes this.

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