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).
Comparative performance data table for various motor cars, including competitor models.
| Identifier | ExFiles\Box 104\4\ scan0268 | |
| Date | 18th March 1936 guessed | |
| Car. Capacity c.c. Weight (cwts) Unladen. Assumed Laden. Laden wt/ capacity Ratio cc/cwt Rolling Rad.Tyres in. Overall gear ratio. 1st 2nd 3rd Top. Gradient Climbable 1 in. 1st 2nd 3rd Top. Buick 40 3800 31 37½ 101 13.6 13.05 7.36 - 4.44 2.7 4.8 - 8.5 Packard 120 4620 33½ 40 115 14.1 9.3 6.25 - 4.09 3.4 5.2 - 8.4 Cadillac 16 7415 58 64½ 115 14.8 11.15 6.84 - 4.64 3.0 5.1 - 7.7 Phantom III 7338 49 55½ 132 15.1 12.0 8.45 5.67 4.25 2.4 3.6 5.4 7.3 Bentley I 3669 34 40½ 91 14.15 11.3 7.1 5.13 4.1 3.3 5.4 7.7 10.0 Bentley II 4256 34 40½ 105 14.15 11.3 7.1 5.13 4.1 2.8 4.6 6.7 8.6 20/25. 3669 39 45½ 81 15.0 15.1 9.56 6.25 4.55 3.2 5.2 8.3 12.0 25/30. 4256 39 45½ 93 15.0 15.1 9.56 6.25 4.55 2.7 4.4 7.0 10.0 25/30 3 speed. 4256 39 45½ 93 15.0 12.8 7.14x - 4.55 3.2 6.0 - 10.0 (alt: 6.8) (alt: 6.4) Notes: Assumed Weight = Unladen wt. plus 4 passengers (at 11 st.{Capt. P. R. Strong} each) plus 1 cwt luggage = U.W. plus 6.5 cwts. In each case the following data has been used. B.M.E.P. 105 at 1000 r.p.m. Except Bentley for which 115 is allowed. Overall Transmission Efficiency 90% Tractive Resistance 40 lbs/Ton wt. .669 2nd speed, X .637 2nd speed. | ||