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 analysis of a Vauxhall 'Cresta' based on an Autocar test, with a power curve graph and drag calculations.
| Identifier | ExFiles\Box 26\1\ Scan089 | |
| Date | 29th June 1960 | |
| VAUXHALL "CRESTA" PERFORMANCE. AUTOCAR TEST NETT POWER 76 HP. MAX AT 4400 RPM. AXLE RATIO 4.111 to 1. TYRE ROLLING RAD AT 87 MPH = 1.02 FT. MAX. AVERAGE SPEED RECORDED = 87.6 MPH. ENGINE SPEED = (87.6 x 88 x 4.111) / 2π = 5050 RPM Graph: - Y-axis: HORSE POWER (0 to 80) - X-axis: RPM (0 to 5000) - Labels on graph: NETT POWER CURVE, MAX. TORQUE, 76HP., 87.6 MPH CAR WEIGHT AS TESTED = 27.5 CWT. = 1.375 TONS TYRE DRAG = 78.5 LBS/TON NORMAL TYRES AT 87 MPH. TYRE DRAG POWER = (1.375 x 78.5 x 87.6) / 375 = 25.6 HP. PROP. SHAFT H.P AT 87.6 MPH = 70 HP. AIR DRAG POWER = 44.4 HP. A = 21.6 SQ. FT. V = 87.6 MPH = 128.6 FT. SEC. K = (550 x 44.4) / (21.6 x 128^3) = .00054 | ||