Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Examination and rectification of various Watford Magnetos.

Identifier  ExFiles\Box 65\3\  scan0263
Date  25th April 1928
  
H.E.W to N.X.7791

EFC.
C. to G/WFH.

ROY{Sir Henry Royce}/JT20/HP25.4.28

Watford Magnetos. (Enblyn)

In accordance with our order R.6531 and R.6568 we returned to Messrs. North & Sons Limited. 10 of these magnetos, also 6 EO.6 type, and 3 RO.{C. C. Rose - Export Manager}1 type 20-HP.
Nos:-

105321    106008
105341    105332
106009    105335
105340    106017
105301
105324    } EW6 type.

99387    99172
99818    97135
98251    97106    } EO6 "

105626/9    102608
105506    106901/7    } RO{C. C. Rose - Export Manager}1 "

for examination, rectification and report.

We are now in receipt of a detailed report covering the whole of these machines, copy of which we give below for your information and action as necessary.

"EW6 Magnetos - No.105301 has been tested and found to spark regularly over a 5 1/2 m/m 3 point gap at 60 R.P.M. advanced and 175 R.P.M. when retarded for 60°. When running at 160 R.P.M. fully retarded the missing is very slight. This magneto is being returned to you as received and we trust that after further tests you will find it satisfactory.
No.105324 has also been tested and found to spark regularly at 45 R.P.M. advanced and 150 R.P.M. fully retarded, the gears on this magneto are being changed to obtain quieter running but the electrical performance is well within the specification.
Nos. 106008, 105332, 105335 and 106017 are being fitted with new gears with a view to obtaining quieter running.
No.105321, the contact breaker spring had been adjusted to give such light pressure that perfect contact had not been maintained and the platinum points had been slightly damaged. The spring has been adjusted and the points cleaned up and the magneto now functions perfectly at low speeds and is being returned to you.

CONTINUED:-

[Stamp on left side: RECEIVED APR [illegible] 1928]
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙