Building Don Young’s 5in O2 Freshwater

[RabbiteerParticipant @rabbiteer]

Is there anybody out there who has or is building this model?

I have never had anything to do with loco building so I foolishly offered to help a friend by cutting parts on my small CNC mill. He bought the plans and most of the parts needed from Don Young in the 1970's and has had them 'pending'. Over time he has drawn all the brass sheet on a CAD program correcting errors so I cut all that in clear plastic, and after quite a few corrections, in brass.

Now we have embarked on the steel, also redrawn in CAD. After some exasperation I bought a new set of plans from Reeves. There are quite a few differences between the two sets and just on the frames he has found errors on both.

[RabbiteerParticipant @rabbiteer]

Plan problems

[Neil WyattModerator @neilwyatt]

Julian Atkins seems to be familiar with most of Don Young's designs. You could PM him and see if he can help.

Neil

[julian atkinsParticipant @julianatkins58923]

I am not sure I can help a great deal.

I have the drawings for Don Young's 5"g O2 'Fishbourne' and the relevant MEs for the construction series in 1967.

My set of drawings would date from the early 1990s. I started on the chassis and cylinder block but never went further than the chassis so never got round to any platework.

The drawings are copies from Don Young's original pencilled drawings which apart from the GA were never redrawn in ink. They are rather faint in places and require a good deal of study. They were Don Young's first published design.

Don kept the master drawings till shortly before his death, and would amend the masters if any glaring errors cropped up.

I knew a number of people who built this design, and I also drove their competed locos. The only errors I can recall are in respect of the 'westinghouse' pump and the steam supply for it, and the shape of the chimney top. The boiler needs updating to provide a boiler bush for the regulator smokebox flange etc.

One elderly club member with no engineering or railway background built an example as his first and only miniature loco and he really struggled with the drawings and making the bits. It is not really a beginners loco.

It also helps if you are familiar with the fullsize O2 'Calbourne' on the Isle of Wight Steam Railway in interpreting the drawings. The drawings for the side tanks and cab and bunker are rather complicated.

Cheers,

Julian

 

Edited By julian atkins on 28/08/2017 10:57:31

[RabbiteerParticipant @rabbiteer]

Many thanks to you both.

for the thread I agree the side tanks cab and bunker are complex. They proved to be a showstopper which is why we started with them. If one considers how much time and concentration it would take with a saw and files you will understand why when I appeared with a CNC mill my half hearted offer was grabbed.

Dennis spent several years developing CAD drawings of the platework that are copies of Don Young's paper version but as I said above developed in CAD then CNCed in plastic to fit together. They are available for anybody wanting to use them.

Even using a small CNC mill and 1 mm and 2mm cutters, to minimise waste, it took quite a long time to gnaw through 9kg of 1.5mm brass.

thanks

Robin

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