Time for a bit of an update. We are trying to get the Britannia smokebox jobs done. The Britannia's whistle valve on the drawings we had was completely wrong, but served as a bit of guidance with the design of the internals. Scaling off photos helped produce a set of working drawings.
The steam line to the real whistle will be concealed behind the valve and go via a bulkhead fitting through the smokebox to a chime whistle between the loco frames.
The bits are machined from brass and will most likely require a jig to assist when silver soldering. The copper rivets keep the fittings aligned with the holes in the body and will be drilled out afterwards. The whistle cord goes up the hand rail.
Also a locking collar was machined up for the regulator spindle to prevent it disengaging off the valve.
Happy steaming!
Nigel
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