Sunday, 21 September 2014
Rolls Royce Armoured Cars - Part 2
Chassis, Springs and Wheels.
The original intention was to make just the 1914 Pattern Rolls Royce Armoured Car. However, I have decided to do the 1920 Pattern as well. The two types of vehicles are extremely similar, with only minor detail variations. The most obvious of these is the wheels. The 1914 used wire spoked wheels while the 1920 used a disc type. The turret on the 1920 was also a little higher in the sides and the driver's vision slots were staggered as opposed to in line.
Also, in the course of further research, I found out that the chassis frames were not parallel to each other but were wider at the rear than they were at the front. This was easily fixed, as will be shown later.
I then made a start on the wheels. As the Cartrix hubs were made to take 3/32nd axle, tubing of that dimension was cut to the appropriate lengths for both front and rear axles, noting that the rear wheels were double tyred.
Once all the wheels sets had been made up, they were set aside and the springs were then constructed. These were made from .20 x .80 thou strip, cut to the required length and then laminated. They were detailed with eyes, retaining/rebound clips, etc made up from plastic strip and rod.
The picture above shows the rear springs for the 1920 Pattern but the method of construction for the front ones are exactly the same. The spring set on the right illustrates how it is sometimes better to apply the pieces over length, allow to harden completely and then trim to length.
They were then attached to the chassis using a simple jig to ensure correct spacing and alignment.
The same jig was also used to ensure uniformity when attaching the axle tube housing (into which the 3/32nd axles would be inserted into). The axle tube housings were cut from 5/32nd tube to the required lengths.
As I mentioned previously, the chassis girders need a slight modification to make them more prototypical. Basically, all that was required was an extra piece glued either side at the rear of the chassis to bring out the sides to the right width and then two pieces of .20 thou strip laminated and glued to form the angled section. The pieces of .20 thou were not cut to the same length but the inside piece was made shorter to allow for the angle. A small piece of .20 thou strip was glued at the edge so it would allow the now .40 laminated strip an attachment point for gluing.
In the picture above, the modified chassis is on the left, the .20 thou pieces for the angled sections and a chassis awaiting modification. The small piece of .20 thou can also be seen at the front end of the .60 thou rear piece.
The 1920 Pattern were made using the exact same method, though they differed from the 1914 Pattern in that they had a modified rear suspension. These were made up as described earlier and attached to the frames.
In the next part I hope to cover making up and the casting of the 1920 Pattern disc wheels and the front mudguards and running boards.