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).
The results of testing different types of hot-spots, including a comparison between cast iron and aluminium.
| Identifier | WestWitteringFiles\K\November1923\ Scan57 | |
| Date | 12th July 1923 | |
| R.R. 493A (40 H) (SL 12 12-7-23). J.H., D.{John DeLooze - Company Secretary} -3- EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/ACL1/L.G1611.23 supplied if the mixture is strong and the hot spot is not at its maximum running temperature. If the heat to the hot-spot was increased by covering the outlet from the silencer, the amount precipitated could be reduced to 3.5% of fuel supplied. (3) RESULTS OF DIFFERENT TYPES OF HOT-SPOTS TESTED. [Diagram 1] Induction pipe. E.A.C. hot-spot. Std. 40/50 RR. hot-spot throttle. [Diagram 2] Exhaust jacketed butterfly throttle. E.A.C. hot-spot. [Table Title] AMOUNT OF PETROL PRECIPITATED PTS/HR. [Table] | R.P.M. | Pet. con. pts.hr. | E.A.C. | Std. 40/50 hot-spot throttle. | Both E.A.C. & Std. 40/50 H.S. thr: | Exh: jack-eted butterfly | Both EAC & exh: jacketed butterfly. | |---|---|---|---|---|---|---| | 500 | 23 | 1.2 | .8 | 0 | 2.76 | 0 | (4) COMPARISON OF STD. CAST IRON E.A.C. HOT & THE SAME TYPE MADE OF ALUMINIUM The aluminium hot-spot proved to be more efficient than the cast iron one. Where the cast iron one gave a precipitation of 1.2 pts/hr. the aluminium hot-spot contd:- | ||