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).
Notes on engine operating temperatures, battery ignition systems, and observations on new aircraft designs.

Identifier  ExFiles\Box 173\2\  img185
Date  22th February 1934 guessed
  
II
with selchrome and nitro alloy. They use cold pressed Castor and 2% Triethanolamine as a preventative during storage.
③ Glycol Temp of Operation.
They are coming to the conclusion that 300°F is too hot for operation and that 250°F is better though they are running both. At 300°F they get spots in the head up to 500°F which is as hot as the air cooled.
④ Battery Ignition.
Not much is being done with this at present. The official attitude is that to couple so vital a thing as ignition with all the wiring which is used in a machine is undesirable. However I should have thought they could have protected it with Fuzes.
We saw the latest twin engined Wright-bomber there with retractable under-carriage, a new Douglas single engined ground straffing low wing monoplane with fixed under-carriage of small dimensions, well streamlined, and the Boeing pursuit single seater.
  
  


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