Rolls-Royce Archives
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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).
Tests carried out on ignition coils with varying secondary turns.

Identifier  ExFiles\Box 33\3\  Scan130
Date  5th May 1921
  
Hsl/LG5.5.21
-2-
Contd.

magneto, the less exacting are our plug requirements. During these tests we have carried out tests on the coils. We have tried coils with 14,000, 16,000 and 18,000 turns on the secondary instead of the standard 21,000. We find that the coils with less turns on the secondary gave the worst results. If we fix the safety spark gap in the coil ignition, the same as on the Watford magneto, we get very similar results.

Hs.{Lord Ernest Hives - Chair}
  
  


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