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).
Experiments with a superheated hot spot system on the Phantom model.
| Identifier | ExFiles\Box 66\2\ scan0236 | |
| Date | 27th August 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to OY. X8230 Hs{Lord Ernest Hives - Chair}/ACLl/LG27. 8. 26. SUPERHEATED HOT SPOT SYSTEM ON PHANTOM. X8230 X8070 Further experiments have been made with the super-heated system of throttle heating in which the water capacity of the boiler was reduced from 185 c.c. to 90 c.c. but the heating surface remained the same - viz - 75.4 sq.ins. The capacity was reduced because it was thought that the smaller mass of water would result in quicker warming up of the hot spot from cold. A .025" dia. feed hole to the boiler was used as previously, this being found to give the best results. The rate of warming up was determined in a [strikethrough] similar way as for the previous tests, i.e. by means of a separate hot spot connected with the system, but this time containing oil instead of water, the temperature rise of which was used as a method of comparing the standard and superheated systems. Oil was used because it gave steadier readings than water. The following curves shew how the superheated system compared with the standard. Examination shews us that the initial time lag of approximately 2 1/2 mins. has not been altered by reducing the water capacity of the boiler. This result is to be expected when we consider that the thermal capacity of the contents of the boiler will be only small compared with that of the exhaust piping and manifold, and again the gas velocity through the pipe is very contd :- | ||