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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).
Results of tests on a general cooling system's suitability under various conditions.

Identifier  ExFiles\Box 131\5\  scan0034
Date  29th November 1937 guessed
  
SHEET (3)
RESULTS OF TESTS SHOWING GENERAL COOLING SYSTEM SUITABILITY UNDER VARIOUS CONDITIONS

(1) COOLING SYSTEM SUITABILITY AT VARIOUS SPEED CONDITIONS WITH COOLING SYSTEM SPECIFICATION DIFFERING AS LITTLE AS POSSIBLE FROM SYSTEM AS DESIGNED (ONLY MODIFICATION BEING 5 BLADE FAN 17.5" DIA x .85 DRIVE RATIO) ALL TESTS WITH BONNET FLAPS OPEN & UNDERSHIELDS FITTED.

RUNNING CONDITION | ATMOS. TEMP DURING TESTS °C | TEMP DROP ACROSS RAD °C | CRITICAL AIR TEMP °C | CORRECTED CRITICAL AIR TEMP °C
--- | --- | --- | --- | ---
IDLING STATIONARY - AFTER PROLONGED FLAT OUT RUNNING | 15.0 | 6.0 | 22 | -
IDLING STATIONARY - AFTER 15 MILES RUNNING ON ROAD | 20.0 | 6.5 | 33 | -
30 MPH FULL THROTTLE | 12.5 | 10 | 48 | -
MAX SPEED FULL THROTTLE - APPROX 75 MPH | 16.0 | 10 | 46 | 44.5

(2) COOLING SYSTEM SUITABILITY AT VARIOUS SPEEDS WITH OPTIMUM COOLING SYSTEM SPECIFICATION i.e. 5 BLADE FAN 17.5" DIA: .85 DRIVE RATIO, PH. III WATER PUMP, FAN BLADES .750 NEARER MATRIX, EX. UNDERSHIELDS FITTED, BONNET FLAPS OPEN.

RUNNING CONDITION | ATMOS TEMP DURING TESTS °C | TEMP DROP ACROSS RAD °C | CRITICAL AIR TEMP °C | CORRECTED CRITICAL AIR TEMP °C
--- | --- | --- | --- | ---
IDLING STATIONARY - AFTER PROLONGED FLAT OUT RUNNING | 18 | 3.0 | 30 | -
IDLING STATIONARY - AFTER 15 MILES RUNNING ON ROAD | 18 | 3.0 | 39 | -
5 MPH FULL THROTTLE. 1ST GEAR. | 14 | 8.0 | 21 | -
15 MPH FULL THROTTLE. 3RD GEAR | 15 | 6.7 | 42 | -
20 MPH FULL THROTTLE. TOP GEAR | 13 | 9.0 | 47 | -
30 MPH FULL THROTTLE. TOP GEAR | 14 | 7.5 | 51 | -
60 MPH FULL THROTTLE. TOP GEAR | 12 | 9.5 | 47 | -
MAX SPEED (74 MPH) FULL THROTTLE TOP GEAR | 11 | 10.5 | 46 | 44.5

(3) RESULTS OF TEST CARRIED OUT ON 10 MILE STRETCH OF OLLERTON - DONCASTER RD. MEAN OF FIGURES TAKEN EACH WAY [SYSTEM AS(2)].

RUNNING CONDITION | ATMOS. TEMP DURING TESTS °C | TEMP DROP ACROSS RAD °C | CRITICAL AIR TEMP °C
--- | --- | --- | ---
MAX SPEED FULL THROTTLE (AV. SPEED APPROX 60 MPH). | 10 | 9.7 | 51 | 49.5

NOTE. CRITICAL AIR TEMPS. HAVE ONLY BEEN CORRECTED FOR MAXIMUM SPEED CONDITIONS AS THIS IS ONLY CONDITION FOR WHICH CORRECTION IS KNOWN AND APPRECIABLE.
  
  


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