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).
Radiator water loss and the design of a square tube radiator for the Phantom II.
| Identifier | WestWitteringFiles\U\2January1930-September1930\ Scan261 | |
| Date | 31th August 1930 | |
| HS.{Lord Ernest Hives - Chair} ) FROM R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} ) [Strikethrough] C. to SG{Arthur F. Sidgreaves - MD} WOR{Arthur Wormald - General Works Manager} [Strikethrough] PHANTOM 2. LOSS OF RADIATOR WATER. After asking EV.{Ivan Evernden - coachwork} to compare the capacities of the old and new radiator tanks we have come to the conclusion that it would not be wise to attempt to artificially increase the capacity of the tank. I have also asked EV.{Ivan Evernden - coachwork} to make an estimate of the water lost by expansion and this does not account for the large loss which is pointed out by HS{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}'s test to be largely due to the motion of the car on the road, and [handwritten] stated to be principally due to pitching. It is obvious that we ought not to lose our water from this cause if it can possibly be avoided. I have suggested that instead of a standpipe we use an inner tube of large diameter in the radiator filler somewhat in the same way as we have been using on the present petrol tank. This will give a small annulus all round rather higher up than at present and could be made less liable to waste water by surging, but it occurs to me to be preferable to cover the large inner hole with a leather or rubber faced disc pressed down from the radiator cap by a spring, so that no water can escape unless the pressure is 1 or 2 lbs above the atmosphere. This should make a remarkable difference in the loss of water because the actual boiling temperature will rise slightly above the 100°C. and no water will be lost by splashing. only [handwritten] There are many modifications of this idea. One is to form a small leak and a cavity so that the water can run back into the radiator somewhat in the same way as acid is reserved in the accumulator vent. The next idea is that it may be necessary to fit a valve so that on cooling the tank is not subject to the 15 lbs. per sq. in. atmospheric pressure. (vacuum) [handwritten]. We are trying at the same time to permit of a good view of the matrix when the radiator cap is removed. SQUARE TUBE RADIATOR. Concerning this, I naturally had a funk that this would not be as effective as the round tube type. It has proved to be practically equal. We have not however carried it out quite as intended. With the square tubes they need not be extended [Strikethrough] expanded [handwritten] at the ends, but the waterway formed by the vertical strip between the tubes. This matrix should be free-r for the passage of air through the tubes and also for the circulation of water by the pump. It should (1) | ||