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    Large calibre weapon systems

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  1. I assume these pictures are from within the old ROF Leeds factory site. If I'm not compltely mistaken it looks like there is a prototype 155mm SP70 turret in the background in the final photo.
  2. Over on the secret projects site I came across a video about the FMBT anglo-german co-operation work. It discusses a joint meeting held to discuss the way forward as FMBT was intended to look at a range of vehicle configurations and ordnance options. In the middle of the presentation it provides some information about different ordnance being considered. The UK provided data on their new 110mm system which they had built and tested previously. https://m.youtube.com/watch?v=BYMPjN3ubzc&feature=youtu.be Edited to delete statement re figures quoted comparing different numbers.
  3. There is a report generated by ARDE in July 1961 looking at the effects of using RMG with both the then current 105mm and the proposed 120mm guns. ARDE Report (B) 7/61 Direct Fire Control with Ranging Machine Gun - an analysis of the errors involved. R. Beresford DRIC Ref AD325780
  4. Stuart, faintly out of the mists of memory comes the name - Duxford Museum near Cambridge, part of IWM I think. Didn't they have two Conquerors and did a deal with one of them.
  5. Thanks thats the pictures I was referring to, but a better quality than mine. Is the gun image from an article by Bill Clayden from RARDE called something like "Philosophy of British gun design". I used to have a copy but lost it many years ago. I seem to remember that at about the same time there were a number of articles also published about Rheinmetal's work and reasoning in developing their smoothbore system.
  6. I have a very poor scan of a group of pictures of some RARDE developed 120mm rounds which were displayed at a BAEE show, I think from an old issue of IDR magazine. Unfortunately no date identified but assume late 70's. One of these showed three rounds. The associated blurb identified them as a 120mm APFSDS, a product improved 120mm APDS and a 110mm FSAPDS which it states "was used for development and demonstrated in the tri-lateral NATO gun firing trials, but now abandoned". This is interesting as I thought the UK only used APDS on these trials, but possibly used outside of the 'official' firing trials. However if they had been working previously on fin rounds for the 110mm ordnances, this might help explain how RARDE so quickly managed to get an APFSDS round ready for the 120mm EXP19-M13A ordnance that were used for the later firings in the US.
  7. This is a British experimental gun but it is the 120mm EXP28M1 intended for the MBT80 programme. The split block breech should be verticle to be in the operating orientation. These pictures are from the Tank Museum. Edit. There was a discussion of British 110mm tank guns earlier on the site ~2011. tanknet.org/index.php?/topic/34275-110-mm-british-tank-gun/
  8. I'm don't know where these figures come from but I'm pretty sure that they do not relate to the gun firing pressure but are actually the material strengths for the component parts. Proof in this case meaning the 0.2% yield proof strength for the individual parts. If I remember correctly the obturator for the X27 was based on the concept used for the 120mm L11 ordnance.
  9. The Royal Ordnance conversion of the T55 / Type 59 for the 105mm L7 involved inverting the breech assembly to enable loading the gun from the right rather than the left. This also involved generating a new recoil system interface bracket (lug) to match the existing recoil system cylinders configuration. The barrel AFAIR remained standard but the existing cradle bearings were modified to suit the barrel. The new ordnance was designated by Royal Ordnance as the N300T1.
  10. During development the designation of the CHARM gun as the 120mm became was the EXP32M1, M2 etc depending on the variant. This became XL30 in official MOD nomenclature following their numbering system, and L30 once in service. Can confirm there was a HEAT round being developed for Chieftain. Was displayed at BAEE one year, mid-late seventies and reported by Jane's. (image attached) I remember seeing an example at RMCS in 1979. Edit to add images.
  11. Think this might be the original article mentioned showing various pictures. http://ftr.wot-news.com/2014/05/06/m24-chaffee-at-dien-bien-phu/
  12. ...... The new British 120mm rifled gun, the XL28 was to fire two part ammunition with a Depleted Uranium (DU) Kinetic Energy (KE) round able to defeat any Soviet tank of the time at ranges out to 3.5km. ...... This was interesting, however the correct designation of the planned ordnance being developed by RARDE for MBT-80 was the EXP-28M1. This was a split block design similar to that eventually designed for CR2 [EXP-32 -> L30]. There was a photo of the ordnance at the Tank Museum in the '110mm Tank Gun' thread.
  13. The L7A3 variant was developed with breech modifications to interface with the Leo 1 recoil system rather than the Centurion recoil system. All L7 ordnance variants had an (eccentric) fume extractor (bore evacuator) fitted.
  14. Yes - but not a bolt in the conventional sense as not threaded. It is forged and then machined to give advantageous grain flow for strength and life. It is also machined internally to form a chamber for the TVE and a fire 'channel' to allow for ignition of the combustible charge.
  15. Stuart you wont find anything in the CR1 manual as that had the L11 ordnance which has a metal/metal obturator to provide the gun seal with the single sliding block. The CR2 is fitted with the L30 ordnance which has a resilient pad (Crossley) obturator. This pad is carried by the BVA and is tied into one of the two sliding split blocks. With the breech open the two piece ammunition is loaded, the TVE is loaded into the rear of the BVA from the automatic tube loader (ATL). The breech is then closed and the two blocks lock the obturator in place. At the same time the firing needle assembly (FNA) is engaged with the BVA locking the TVE in place. The breech assembly automatically provides electrical connections to the firing circuit through the brrech blocks and breech ring. The same design of system is used on the 155mm AS90 ordnance, and resilient pad obturation has been used for the US M109 artillery guns. ETA: this link http://www.freepatentsonline.com/4308785.html takes you to a patent which shows how the split breech concept works.
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