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).
Goshawk I type test for sparking plugs, detailing electrode erosion measurements.
| Identifier | ExFiles\Box 58\2\ Scan143 | |
| Date | 11th July 1934 | |
| To EP.{G. Eric Platford - Chief Quality Engineer} 811/12a Hs{Lord Ernest Hives - Chair}/Wst.1/KW.11.7.34. Goshawk 1. Type Test Sparking Plugs. Lodge X.400.B and K.L.G. 744.B Sparking Plugs were used on the above type test and we attach herewith a table giving the electrode wear measured on the central electrode after the test. Three of the plugs, numbers A4E (Lodge X.400.B); B.1.I. (K.L.G.744.B); and B.1.E. (Lodge X.400.B), failed on our leakage test at the conclusion of the test. Electrode Erosion. Position in Engine Type of Plug Diam. of Electrode Wear A11 K.L.G. 744 B .064 .036 A21 " .063 .037 A31 " .064 .036 A41 " .064 .031 A51 " .075 .025 A61 " .079 .021 A1E Lodge X400 B .073 .027 A2E " .078 .022 A3E " .085 .015 A4E " .080 .020 A5E " .085 .015 A6E " .088 .012 B11 K.L.G. 744 B .052 .048 B21 " .052 .048 | ||