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).
Summary of findings on bonnet ventilation, fan efficiency, and radiator design for the Phantom II.
| Identifier | ExFiles\Box 24\5\ Scan237 | |
| Date | 25th June 1930 | |
| -7- advance or fan, but we are confident that it will be up to standard on the present 10,000 miles test. SUMMARY. Bonnet Ventilation. Phantom II requires as much ventilation as we can give it, as the lower half of the radiator cannot pass air very freely at present. Attacking the undershield seems the most promising development. Fan. The fan is of more importance at high speeds than we thought. We cannot afford to dispense with any of its efficiency. Possibly we should try to improve the adequacy of the drive to enable it to withstand high engine speeds. Radiators. We have found a difference in radiators made to the same drawing. We learn from Mr. Anderton Brown, the cooling expert at Farnborough, that this is a difficulty he is constantly encountering. We know that we have lost a little efficiency in going from the 1 mm. to the 1 1/4 mm. gap, but the change was inevitable to prevent choked matrixes. The 26.8" high matrix will improve the conditions but gives us more air to get away from under the bonnet if the increase in area is to be used efficiently. General. Improved acceleration, brakes and arterial or | ||