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).
On adjustments to the magneto timing for an F.XII No. 7 engine and the resulting changes in RPM.

Identifier  ExFiles\Box 33\4\  Scan099
Date  26th November 1927 guessed
  
X1770

To HS{Lord Ernest Hives - Chair}

Exhaust Mag timing on F.XII No 7 engine altered to 38 1/2° BTDC The drop in RPM now is

A side switched off (35°) 2100 Both on
B " (38 1/2°) 2120 2250

The old timing 35° BTDC for both mags gave

A off 2040 RPM
B off 2120 "

We are copying a preparing engine for dispatch first thing tomorrow

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