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).
Graph of road wheel dynamometer power curves in direct gear.

Identifier  ExFiles\Box 109\4\  scan0098
Date  15th June 1939
  
ROAD WHEEL DYNO. POWER CURVES
DIRECT GEAR
SHEET 1
CHASSIS: 30 G VII
ENGINE UNIT: B 80 Nº I
AXLE RATIO: 9.37
TESTS RUN ON: 6.50 x 16 DUNLOP
TRACK RACING TYRES @: 45 LB/IN²
A: COMPLETE MOTOR CAR - BUICK AIR & EXHAUST SILENCERS.
B: FAN REMOVED
C: AS A BUT WITH CARB NEEDLE SEATING INCREASED FROM .112" DIA. TO .140" DIA.
D: EXHAUST SILENCER REMOVED LEAVING MANIFOLDS ONLY. No FAN. .140" DIA. CARB. NEEDLE SEATING.
E: TEST BED CLUTCH H.P. WITH BUICK AIR & EXHAUST SILENCERS FITTED.
LEFT AXIS: B.H.P. CORR. TO 50°C AIR TEMP.
BOTTOM AXIS: ENGINE R.P.M.
RIGHT AXIS: APPROX. M.P.H. IN DIRECT GEAR USING 7.50 x 16 TYRES.
RM{William Robotham - Chief Engineer}/TAS{T. Allan Swinden}/15.6.39
  
  


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