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).
Temperature tests of standard tall coils in stabalite and redmanol cases.
| Identifier | ExFiles\Box 45\4\ Scan253 | |
| Date | 14th July 1924 | |
| EFC. WA.{Mr Wallis}60. COPY. 14.7.24. X.4079. TEMPERATURE TESTS OF RR.STANDARD TALL COIL IN STABALITE AND REDMANOL CASES. Comparative tests have been made with four coils, two in stabalite cases and two in redmanol. In each case a stabalite and redmanol encased coil were heated and tested together. The coils used were :- (1) No.TR.{Capt. F. W. Turner - Finance}1 - a redmanol encased coil which has done 6322 miles on experimental Goshawk chassis. (2) TS6. - a stabalite encased coil which has been used for various bench tests. (3) TR.{Capt. F. W. Turner - Finance}5. - a redmanol encased coil received from Mr. Brock. (4) 4383. a standard stabalite encased coil taken from production. TR{Capt. F. W. Turner - Finance}1 was tested together with TS6, and TR{Capt. F. W. Turner - Finance}5 with 4383. For the purposes of heating the coils a small electrically heated low temperature oven was utilised. In each case the coils were bolted together to a metal plate which rested upon wood blocks in the oven, a wire from the plate being connected to the body of the distributor. The procedure in both cases was that the coils were heated to four different temperatures; tests on the H.T. sparking being made at each temperature, the coils being maintained at the particular temperature required for a short time, to allow for lagging. The temperatures the coils were raised to were 77°, 82°, 87° and 100° C. respectively. A standard distributor with make ratio set to .5 and standard (25") ballast resistance were used the distributor running at 700 r.p.m. In each case the coils discharged at 6 three-point spark gaps graduated from 6.5 mm. to 4.0 mm. viz:- Gap No.1. 4.0 mm. 2. 4.5 " 3. 5.0 " 4. 5.5 " 5. 6.0 " 6. 6.5 " At each temperature two tests were made, one at 8 volts and the other at 12 volts. The results are tabulated as follows :- Contd. | ||