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).
Cooling performance of an armoured car chassis for the India Office and proposing improvements.
| Identifier | Morton\M5\ img041 | |
| Date | 1st December 1921 | |
| X4195 c. to Hs.{Lord Ernest Hives - Chair} C. to Mr. Maddocks Dal/1.12.21. ARMOURED CARS FOR INDIA OFFICE - COOLING. I met Mr. Hives and Mr. Maddocks at Conduit Street yesterday morning. Mr. Maddocks said that the trial up the Snake of an Armoured Car chassis was in order, and probably the best the car could do. The water actually reached boiling point during the trial, but this was not noticed by the I.O. Officer. The chassis was loaded to 4 tons. 8 cwts. had no body or armouring, a standard undershield and a high-speed fan pulley. Ambient temperature 38°F - water temperature at bottom 150°F, do - at top 201°F.{Mr Friese} Max. speed 28 M.P.H. Minimum speed 20 M.P.H. Average speed for 3+ miles in 7.86 secs. - 26.75 M.P.H. mostly on second gear. The car quoted against us started at 149°F and finished at 186°F.{Mr Friese} Ambient temperature 59°F.{Mr Friese} - speeds and times not given but said to be mostly on 3rd. speed and slower than R-R.{Sir Henry Royce} We subsequently understood that it is a Crossley Car 4 cyl. 4.5" bore 5.5" stroke - 350 cu.ins. capacity - against our 453 cu.ins. weight carried 4 tons. 4 cwts., but Major Lewin would not give us the gear ratios or any further particulars. At Conduit Street we discussed various proposals for improving the cooling. 1. Fitting an undershield of a type to give more air space. 2. Increasing the radiator. 3. Enlarging radiator tubes. 4. Speeding up the water circulation. contd:- | ||