HR27 Small Goods-Making a Start.

 

HR27 Coupling and connecting rods have limited clearance due to the outer skirt/valence.

I have made a start, as you can see in the above photo, on a Small Goods or "18 Class" engine, No. 27 in fact, in the form that it was rebuilt by Jones in 1891. This will be built without the aid of a kit; there is no kit for this engine though an etched sheet was used as an aid to build the tender, which is the subject of an earlier blog posting of 7/10/21 entitled "A tender in search of a loco". I will rely as usual on Laurie Griffin's castings to complete the model. 

The initial difficulty I came up against was fixing the position of the slide-bars on the frames, so that the connecting rods ran freely, and ensuring that these parts, along with the coupling rods were slim enough to fit inside the deep outer valence or skirt. This was achieved by a process of trial and error and by gradually slimming down and reducing the parts to fit with files; there is not much room. The wheels require little side play as the wheel-base is only 15ft and this helps matters.

My reference drawings, from Peter Tatlow's "Highland Locomotives" show that there is space to fit an M1833 motor and flywheel inside the body shell, which should make for a powerful little locomotive. I have modified the drawing on pg. 20 to include the changes made by Jones when he rebuilt the class.   

Fitting the motor is the next step, then weight will be added in the ash-pan between the wheels and springing will be arranged for the front axle to make a viable mechanism.