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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 and consumption test report focusing on 1-RT-1 carburation.

Identifier  ExFiles\Box 147\5\  scan0184
Date  4th September 1941
  
To Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/TAS{T. Allan Swinden}:
c. to Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}
c. to Rm{William Robotham - Chief Engineer}/OTS.
c. to Rm{William Robotham - Chief Engineer}/Fred Hellem.
c. to Rm{William Robotham - Chief Engineer}/Col.

? 1249

Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}10/SW.4.9.41.

1-RT-1 Carburation.

Petrol Consumption.
We have now set the single Stromberg carburetter to give the following consumption:-
23 MPG. at an average speed of 38 MPH. over 66 miles.
The route was Clan - Derby - Ashbourne - Buxton - Bakewell - Clan.
All except the Ashbourne - Buxton section was run at 45-55 MPH. The Ashbourne - Buxton section was driven flat out. Overdrive gear was not used.

Performance.
Tests carried out on the Salt Box Straight with a dry road and calm weather.
10 - 20 MPH in 7 secs in DIRECT GEAR.
10 - 30 " " 14.1 "
10 - 40 " " 21.5 "
10 - 50 " " 31.3 "
10 - 60 " " 44.5 "
Mean Maximum Speed in Direct Gear - 69 MPH.
The above performance figures were obtained using a fifth wheel.

NOTE:-
These acceleration figures are only slightly worse (2.7 secs for 10 - 50) than those for the 1939 Hillman 14 quoted in The Autocar of 3.2.39.
Maximum speed is the same.
1-RT-1 at 31 cwt. is 3 3/4 cwt. heavier than the Hillman.

-continued-
  
  


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