Following on from the fitting crews and fire irons to various locos it's back to some rather more fiddly modelling in the form of the injectors for my Ivatt Class 2 tank. These injectors have quite a distinctive shape and I am not aware of any commercial source of realistic representations of these items. To overcome this lack, I decided to try and represent the injectors and their mountings using multiple layers of custom etchings, produced to my sketches by Rumney Models. I use the word "fiddly" because each injector unit consists of 30 separate pieces, not including the wires representing the pipework, despite the body only being 5.7 mm long.
Here's a photo of the real thing, fitted to the Ivatt Class 2 2-6-0 tender loco at the SVR. The injector is identical to that fitted to the tank engines except for the mounting bracket and orientation of the water feed pipe.
For the model, I produced this sketch of the assembly relative to the chassis main frames (on the right) and underside of the cab/side tanks (along the top). Drawn 10 times full size, I realised I needed to make some slight changes (as noted) to allow for some minor dimensional compromises.
Here we have one of the assembled injector body/mounting bracket units (LHS of the loco) with the various pipes and water valve operating spindle laid out in roughly their correct relative positions. The pipes will be bent to shape and fitted after the injectors have been fixed in position on the loco main frames.
Also shown is the other injector and bracket (RHS) which is, of course, the opposite hand.
Think I probably need to go and lie in a darkened room for a while after that lot.