
The castings look fabbo Justin
Russ Elliott wrote:Justin - how is the fold-over thingie attached to the buffer tail?
Brinkly wrote:Will you have these ready for Scaleforum?
jjnewitt wrote: The Bachmann model is a 14T tank (technically I think it’s a 14T class A tank), the 20T class B tanks were longer and of slightly greater diameter which although not huge has a knock on effect on the profile of the saddles.
Noel wrote:One problem with a prototypically open chassis for tanks, though, is where do you add extra weight if you feel the need? Perhaps between the central longitudinals?
Noel wrote:The body illustrated is intended to be a Class B [it has the valve wheel for bottom discharge], but its length does suggest that it's a 14T Class B, not the 20T Class B it is purporting to be. Bachmann do have a 14T Class A, the one in Benzole livery. What I don't know is whether their diameters are different [the class A should be slightly larger in diameter for the same load, if it's the same length as the Class B, as its contents would be less dense].
Noel wrote:The National Benzole livery version shown on the tanks on Paul Bartlett's website was introduced in 1959, so these wagons would have originally carried an earlier version if they were new to NB.
Noel wrote:I look forward to seeing more of the chassis; being a standard RCH type it will presumably work for the 14T tank, both cradle and saddle mount, as well? I prefer to work in plastic if possible, and had started a combination of a Bachmann 14T Class B body and a Cambrian chassis, but I think I will have to start soldering...One problem with a prototypically open chassis for tanks, though, is where do you add extra weight if you feel the need? Perhaps between the central longitudinals?
jjnewitt wrote:the actual size of the tank would presumably depend on the type of class B traffic it was intended for??
jjnewitt wrote:The chassis I've done has the later type (post 1939?) framing with straight channel section all the way down the centre of the wagon. Every anchor mount I've come across seemed to have this arrangement. The 1927 and Air Ministry 14T tank wagons all seemed to have the earlier type chassis with Y faming at the ends so tehcnically it wouldn't be correct for these earlier wagons.
Noel wrote:Tourret quotes diameters of 5ft 7.5ins, 5ft 10.5ins, 6ft 2.875ins, 6ft 7.25ins and 7ft 2.125ins for loads of 10, 12 or 14T, covering Class A, class B and unclassed traffic.
Noel wrote:Geoff Kent gives a date of 1940 for the change in chassis design, but with a prolonged gradual change.
Noel wrote:The Air Ministry 14T tanks were built from 1939 to 1944, but more towards the end than earlier, as the demand for aviation spirit was at its highest in 1944-45. In rough terms, the first 1000 were built 1939 -1942, the next 1000 in 1942 and the final 1000 in 1942-1944, the actual total being 3170 [including 400 or 450 lubricating oil tanks]. The figures are from an article by Peter Fidczuk in Modellers' BackTrack Vol.3 Nos. 1 & 2. He also gives a 1993 drawing of Hurst Nelson 1940 built AM432, a saddle mounted Class A tank, converted to Class B for SMBP, which shows the later type of chassis.
Conversely he also gives a 1993 drawing of Charles Roberts 1942 built AM1144, an anchor mount lubricating oil tank, converted by SMBP to a bitumen tank, which has the earlier design of chassis. It seems that either chassis was acceptable, and each builder could use whichever they chose.
IANATEXTON wrote:For getting some weight into a tank wagon I have made a small hole and poured in some liquid lead.
jjnewitt wrote:IANATEXTON wrote:For getting some weight into a tank wagon I have made a small hole and poured in some liquid lead.
Liquid lead isn't a bad idea. I did wonder how easy it would be to secure within the tank if you don't need to fill it right up? Did you use a glue of some sort to stop it moving around?
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