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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph from cooling tests comparing air temperature rise across the radiator and to the floorboards, with the bonnet on versus off.

Identifier  ExFiles\Box 131\1\  scan0030
Date  23th September 1931
  
25 EX. COOLING TESTS:- AIR TEMPERATURE RISE ACROSS RADIATOR.
AIR TEMPERATURE RISE FROM FRONT OF RADIATOR TO FLOORBOARDS.
USING '3 1/2" HEXAGONAL MATRIX TUBES.

Left Graph:
BONNET OFF. AVERAGE AIR TEMP: 12.5°C
CYLINDER WATER TEMP:- 57.5°C
CYLINDER WATER TEMP:- 85°C

Right Graph:
BONNET ON. AVERAGE AIR TEMP: 13.5°C
CYLINDER WATER TEMP:- 58°C
CYLINDER WATER TEMP:- 85°C

AXIS LABELS:
Vertical Axis: AIR TEMPERATURE INCREASE (°C)
Horizontal Axis: ROAD SPEED (M.P.H.)

LEGEND:
AIR TEMP: RISE ACROSS RADIATOR:- 1) LOW WATER TEMP. 2) HIGH WATER TEMP.
AIR TEMP: RISE, FRONT OF RADIATOR TO FLOORBOARDS:- 1) LOW WATER TEMP. 2) HIGH WATER TEMP.

NOTE:
SHADED AREA REPRESENTS AIR TEMP: INCREASE DUE TO EXHAUST AND ENGINE HEAT RADIATION
  
  


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