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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).
Performance comparison of the Goshawk II motor as applied to the Goshawk I engine with different reduction ratios.

Identifier  ExFiles\Box 35\4\  scan 046
Date  30th August 1921
  
X 4384.

To R.{Sir Henry Royce} from EFC.
c. to CJ.
c. to E.{Mr Elliott - Chief Engineer}
c. to Da.{Bernard Day - Chassis Design}
c. to Da{Bernard Day - Chassis Design}/T. } at W. Wittering.

EFC1/T30.8.21.

X.4384 - "GOSHAWK II" MOTOR APPLIED TO "GOSHAWK I" ENGINE.

We attach table showing our estimate of the performance of the Goshawk II motor as applied to Goshawk I engine with a reduction ratio of 14.4 instead of 8.4 as on Goshawk II.

It will be seen that the relative performances should be approximately in accordance with the following table :-

Quantity. Goshawk II. Hoshawk I.
Motor volts. 9.26 10.1
Amperes. 137 95.5
Electrical H.P. 1.87 1.29
Motor speed. 810 1363
Engine speed. 96.5 94.5
B.H.P. .85 .835
Efficiency. 50% 64.6%

It will be remembered that the calculations of the performances are made for these for the Goshawk II engine in a quite cold condition, so that in nearly every case of starting the figures of operation here cited for Goshawk II are modified to more nearly those corresponding to Goshawk I engine.

MADE AT CROXLEY

EFC.
  
  


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