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\ Scan266 | |
| 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 (25Ω) 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. | ||