Seven-foot models used forthe wind tunnel tests. These show the original locomotive and the design finally selected after the experiment.
The locomotive which had to be entirely covered by the streamlined model. This proviso blocked any attempt to streamline by cutting back the smoke
box, as was done in designing the Silver Jubilee engine.
The new design photographed to the same scale as the standard locomotive. This shows how the elements making for wind resistance have been
smoothed away into unresisting planes.
streams along the sides of the locomotive. The hori
zontal plane projecting round the front of the loco
motive at approximately deck plate height also helped
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to avoid low pressure pockets along the sides and in
front of the cabsometimes found to be a tendency in
what are known as "shovel nose" type locomotives.
c
