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There is a thread on the Secret Projects (Army) website titled "SP70 / PzH 155-1" Has a number of images of Phase A and B variants. It includes internal and external views, including one of the engine bay. There may be something there to help. Regards
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The ordnance designation for the T54/55 upgrade was the N300T1. Although based on the L7 standard, it was not a matter of just turning the existing system through 180 degrees. The breech required significant design effort to function upside down so being able to open to the left rather than the right. Also the breech was further modified to incorporate new lugs to integrate with the existing recoil system configuration which is different to those used both on the L7A1 (Centurion) and the L7A3 (Leopard). Part of the upgrade kit was to modify the recoil system to cater for the increased loads incurred from the 105mm ammunition.
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As far as I can remember yes but it was a fitting exercise for test and assessment purposes only and did not proceed as far as firing trials. To do so would have needed a modified higher strength M68 breech. Not sure if M68E4 version was available then.
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Just to show it worked. I believe this may have been the Canadian C1 version. And raise you the M60 option. Both down at Lulworth Cove firing point.
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There was an entry in Jane's Armour and Artillery Upgrades in the 2009 edition for the Rh 105SB. Indicated a higher strength material barrel and a multi-lug breech amongst other bits.
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Try this, if you haven't already done so. https://fromtheswedisharchives.wordpress.com/2019/01/03/rheinmetall-105-cm-smoothbore-performance/
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Przezdzieblo: I forgot to ask earlier. What was the source for the UK 120mm ordnance illustration?
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I don't believe any brochures were produced as design hadn't been "chilled". The attached is from a post on BOCN showing a "space model" with a 120mm SB drill round for comparison.
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Couple of corrections to the IWS gun description. The breech was based on the standard L7 horizontal opening system not vertically ooening. (During development trials it was fitted with the breech from the vertical opening 110mm EXP14 gun.) The increased size was for balance not strength as this was catered for by material changes. The muzzle brake was a semi-integral design with a slide on external baffle assembly. This was held in place with a locking ring at the muzzle which may be why this screwed-on assumption was made. Out of interest the earlier similar muzzle brake for the RO 105mm Low Recoil Force gun was a complere screw on system. There were a number of iterations of the RO APFSDS projectile (designated the T15-series) over the life of the project with varying weights, configurations and muzzle velocities.
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I've found this presentation/report extract that I'd made a note of, but unfortunately not where it's from - possibly based on the one that Stuart referenced. " Royal Ordnance PLC has designed a new 120mm APFSDS projectile known as BD26 for use with L11 and XL30 guns. The capabilities of the new round were described in a presentation to MOD by the Company on 14 Nov 1986. The full script of the presentation is included at Appendix 1. The improved penetrator provides the round with approx.. 15% increase in penetration performance compared to the L23(OE) when fired from the L11 gun and approx. 25% when fired from XL30 with the HP charge. INTERFACE WITH CHARM -- BD26 anticipates the introduction into service of CHARM by making use of the CHARM ULC and tank stowage. In order to meet the ISD for BD26 of 1989 it is necessary to bring forward the CHARM ULC and stowage as follows:- ULC The WES development programme shows a confirmatory development trial commencing in early 1988 and running for 6 months. The trial will be undertaken with ULCs to the chilled design. This trial could be combined with the BD26 Environmental (logistic) trial to prove the ULC and the new round at the same time. Any modifications required for the ULC can be embodied into the Frozen design which will go forward for the CHARM Environmental trials. At the same time the CHARM ULC could be introduced into service with BD26 rounds. STOWAGE It is understood that the conversion of vehicles for CHARM commences in 1990. If BD26 is accepted for service use then this timescale will have to be brought forward by some 12 months. So what is BD26. As you have heard it is an improved tungsten round, actually composed of a new tungsten nickel iron alloy. BD26 is based on the CHARM qualified chill design, and has been successfully fired at up to the CHARM gun maximum pressure. It uses the L8 charge but can be fired from both existing L11 gun and the XL30 proposed CHARM gun. The most important feature of the new round is the new penetrator material tungsten nickel iron TF49P which makes use of the latest in sintering technology. In the past this material has been criticised for the variability of its properties, compared with standard material, but the situation is now reversed. And this particular alloy is without doubt the best tungsten based penetrator material available today, in terms of toughness and ductility. In fact it is at least twice as tough as the standard nickel copper alloy The overall length is changed but it is the same length as the CHARM shot. This means that the CHARM ULC could be used to transport BD26, and this would enable you to completely perfect an aspect of CHARM logistics before introduction of its actual ammunition into service. The actual penetrator will weigh 4.1kg which will result in a length over diameter ratio of 18.6, which is a good increase over L23's ratio of 14.1. The CHARM round will be 30mm longer than the current OE round and BD26 matches this exactly. Core - Both BD26 and L23 utilize a monobloc penetrator. However, the core material for BD26 is Tungsten-Nickel-Iron (W.Ni.Fe) as opposed to the Tungsten-Nickel-Copper (W.Ni.Cu - S.T.A) material for L23. For BD26 the core diameter has been reduced from 29.0mm to 26.7mm and the overall length increased from to 497mm giving an L/d ratio of 18.6:1. These changes have also increased the weight of the core from 3.69 kg to 4.08 kg. Shot Length - The overall shot length has been increased from 510 mm to 540 457mmmm. CHARM Total Weight: 8.00 kg (Nominal) Overall Length: 542.0 mm Sub-Projectile Total Weight: 4.30 kg (Max) Penetrator Material U 3/4 Ti Weight: 4.1 kg (Nominal) Length: 500 mm (Nominal) "
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RARDE developed the 120mm EXP19-M7 ordnance series based on the L11 configuration, updated using 110mm technology, and firing stub case ammunition. Either the standard L11 or this ordnance was used in the second round of trilateral trials. Following the trials the ordnance was redesigned to the EXP19M13 configuration for the XM1. However the Rh120SB was eventually selected.
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Completely different. The L11 uses a fully combustible charge system with a breech metal/metal seal for obturation. The EXP19-M13A used a stub case with integrated combustible charge and sliding block breech. It had a shorter barrel with higher operating pressure than L11. The ordnance system was configured to suit the XM1 Elevating Mass configuration requirements.
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I assume you've already looked at this site. https://tanks-encyclopedia.com/ Another ssource for information would be "Armoured Archives" on YouTube.