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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).
Redesign of a petrol pump from sylphon tubes to a fabric diaphragm to reduce cost.

Identifier  ExFiles\Box 27a\2\  Scan039
Date  4th May 1931
  
Hs.{Lord Ernest Hives - Chair} } FROM R & E.{Mr Elliott - Chief Engineer}
Ev.{Ivan Evernden - coachwork} }

c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager}
c. HV. RHC.{R. H. Coverley - Production Engineer}

X2677

RL/M4.5.31.

X.7460
X.5460
X.2677.

PETROL PUMP.

In consequence of the high cost of sylphon tubes we have altered our pump design to a fabric diaphragm, hoping that it will prove quite reliable for 2 or 3 years, and our design is simpler than A.C., which has a curious drag link of unnecessary complication.

It is especially designed to suit P.2. engine and will be arranged in perhaps a better position in J.1 and 3.

For a long time I have favoured a pump instead of the autovac which is now more complicated and costly. The pump giving a constant head and a large reserve of capacity has made the problem still simpler and more satisfactory.

We will work at these designs until they are as efficient in cost/value as others, and the Works will say whether they will make or buy.

If they can make at say cost to buy, plus 25%, and contribute something towards charges, say 150% on time and 20% on material, then it would be better for Derby to make.

All purchased parts or materials should carry 20% of charges for buying etc.

R.{Sir Henry Royce}
  
  


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