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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).
Design position report detailing modifications and their status for the Merlin 'C.1' and 'C.2' engines.

Identifier  ExFiles\Box 30\4\  Scan327
Date  20th June 1935 guessed
  
ITEM. (9) DESIGN POSITION.

MERLIN "C.1" ENGINE.

Air intakes to suit various aircraft installations. In hand.
Modified oil drain from wheelcaseto lower half crankcase. Completed.
Modifications to generator pump drive. Completed.
Moderate ratio supercharger gears (7.341:1) Completed.
Ratio.
Modified camshaft oil feed pipes. Put aside.
Modified main drive shaft. Completed.
12 bolt wooden airscrew hub. Completed.
Modified reduction gear ratio - starter motor. Completed.
Strengthened supercharger rotor. Completed.
Modification to airscrew hub. Completed.
Modified cam and rockers. Completed.
Modifications to spring drive. In hand.

MERLIN "C.2" ENGINE.

Cylinder head - modified coolant passages and valve centres, In hand.
inlet side plug.
Supercharger drive - roller bearing for rear layshaft bearing. Superseded
Modified supercharger. In hand.
  
  


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