Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

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PMP
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Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby PMP » Tue Nov 12, 2019 2:47 pm

EA11698E-CA92-4D40-8FF6-36DF5A59CAAF.jpeg


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Rails have announced the release of BR Gas Turbine 18000. In partnership with Heljan. A limited edition in three liveries for release late next year.
More details here
https://railsofsheffield.com/groups/286 ... 8000-class

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6C
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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby 6C » Thu Nov 14, 2019 9:05 pm

Interesting - thanks for the heads-up.. :D
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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby mjb1961 » Wed Nov 20, 2019 6:02 pm

Quite fancy one of these ,just to collect,maybe the first version in gloss black ,the thing about pre ordering things like this is it takes around 18 months before you receive it ,if your lucky ,I've had the NER autocoach ( rails exclusive ) on pre order since this time last year and it is due to be in stock towards the end of the Q1 2020.

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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby Bigmet » Thu Nov 21, 2019 8:42 am

I have a major curiosity about how this one is 'made to work' for RTR OO. The deep and very visible full length frame (in the fetching lilac colour) is narrower than the body work, and fully encloses the tops of the large bogie wheels. That's going to be a challenge for the standard R2 capability, there simply isn't much side to side clearance for the bogies to swing for curves. It will be a question of which of the various dodges available the designer goes for (over scale frame width, undersize wheelsets, increase ride height, make frame non continuous and allow the section surrounding the wheels to move with the bogie).

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Forfarian
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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby Forfarian » Fri Jan 03, 2020 12:21 am

What type of gas does it run on :lol: :roll:
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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby Bufferstop » Fri Jan 03, 2020 5:12 pm

I saw the thing just once, waiting on a bus (front top deck) at the single lane bridge that crossed the end of Bescot yard, this thing came through pulling a long rake of decrepit bogie vans. Took me ages to find out what it was. The rake of vans must have been a set kept by Swindon, because I'm sure it was the same set I saw behind one of the first Westerns. The route through Bescot, Aston and the South Birmingham line was a diversion which avoided Snow Hill and regained WR metals at Tyseley.
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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby mjb1961 » Sat Jan 04, 2020 8:49 am

Forfarian wrote:What type of gas does it run on :lol: :roll:

Methane ,,you have to fart into the tank to fire it up :D :lol:

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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby Bigmet » Sat Jan 04, 2020 10:52 am

Forfarian wrote:What type of gas does it run on :lol: :roll:

For those that don't know, the reason for trying a gas turbine was relatively cheap fuel. This was 'Bunker Oil' that was the residue from petroleum refining at the time. In one form or another this delightful goop had proved useable in steam locomotives; and here was an alternative technology that might be a way of using it, with the added bonus of no significant water supply requirement.

What those concerned could not foresee was the rapid development in refinery technique, and particularly the 'catalytic cracking' that would soon emerge, which meant that the available volume of the cheap residue product declined dramatically. As it was, the gas turbine tech. wasn't 'all there yet' and the railway operating environment wasn't favourable to its most efficient use either. So diesel it was to be. Of course, current small gas turbines are easily an order of magnitude superior. It might not be over...

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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby D605Eagle » Fri Jan 31, 2020 2:04 am

The Yanks successfully used gas turbine locomotives, it was the as mentioned cracking of the previously waste product fuel that killed them as they used a scary amount of the stuff compared to an internal combustion diesel.

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Re: Rails/Heljan BR 18000 Gas Turbine in 4mm/OO

Postby Bigmet » Fri Jan 31, 2020 3:11 pm

D605Eagle wrote:... as they used a scary amount of the stuff compared to an internal combustion diesel.

Many folks probably don't know this, but the early gas turbines had a very small power band, between the minimum 'idling' speed which was still circa 50% of full power, and full power. So no 'sipping fuel' at tickover, once it was running it drank fuel whether the power was required or not. This really mattered in a railway application, where on a near level mainline the power requirement even for express speed could be a few hundred horsepower. The 2,000 hp turbine required for the machine to power at speed up steep gradients - such as the GW's west country route - would have been burning excessive amounts of fuel almost all the way between London and the first of the South Devon banks...


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