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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).
Comparison test report for S.U. carburettor needles, type RR.X versus RR.A.

Identifier  ExFiles\Box 31\5\  Scan086
Date  27th July 1933
  
X 1-181.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from F.Dodd. Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}10/KT.27.7.33.

COMPARISON TESTS WITH S.U. CARB. NEEDLES - 4.B.IV.

Acceleration Tests. AVERAGE BOTH WAYS. NEEDLES. TYPE.
RR.X. RR.A.
10 - 30 mph. 7.6 sec. 8.1 sec.
10 - 40 mph. 11.9 sec. 12.7 sec.
10 - 50 mph. 16.0 sec. 17.2 sec.
10 - 60 mph. 20.9 sec. 22.2 sec.

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Performance Test. Ticknall Hill. RR.X. RR.A.

56.2 sec. 73.6 mph. 58.5 sec. 72 m.p.h.

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Consumption Test. with measured gallon :-

RR.A. Average Speed 48.32 mph. 15.1 M.P.G.
RR.X. " " 54 mph. 18.1 M.P.G.

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RR.A. type needles are present production and
we would recommend changing over to RR.X. as soon as
possible.

Hs{Lord Ernest Hives - Chair}/F.Dodd.
  
  


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