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).
Specification for the H.T. Ignition Cable for Merlin F Engines.
| Identifier | ExFiles\Box 61\1\ scan0300 | |
| Date | 8th June 1936 | |
| To Hy.{Tom Haldenby - Plant Engineer} c. to Roy.{Sir Henry Royce} c. to A.I.D. (Mr. Barrett), 86110. Hs{Lord Ernest Hives - Chair}/Wst. 28/JH. 8.6.36. Aero H.T. Ignition Cable for Merlin F Engines. The correct specification of the ignition cable for the first production Merlin F engines is as follows:- (a) Conductor. 23/.0076 stainless steel wires. (b) Dielectric has vulcanised rubber .068" radial thickness. (c) Ozone resisting covering. "Thiokol" sheathed .030" radial thickness. (d) Final covering for ease of handling. Black cellulose varnished overall (about twenty applications) and polished. This is the type of cable used on the type test Merlin F.11. and should be obtained from the British Insulated & Helsby Cables Ltd., We should like to point out that we have made one slight amendment in the specification as compared with the actual cable used on the type test. On this engine the conductor consisted of 19/.012" stainless steel wire and we found this almost impossible to handle successfully when making up the end fittings, hence the reversion to 23/.0076" which is of course more flexible and easier to handle. Hs{Lord Ernest Hives - Chair}/Wst. | ||