Comparison of specifications for two different types of tires, 'Fort '90'' and 'M.A-2'.
| Identifier | ExFiles\Box 157\1\ scan0154 | |
| Date | 23th November 1934 | |
| Technical Department, FORT DUNLOP. 23.11.34. 7.00-19 : M.A-2 v. {VIENNA} '90'. ------------------------ Fort '90'. M.A-2. ---------- ------ Rim - 4.00" 4.00" Diameter - 33.40 33.40 Width - 7.15 7.10 Effective Radius - 15.6 15.5 Pattern Depth - 11.9 m {Mr Moon / Mr Moore} /m. 11.4 m {Mr Moon / Mr Moore} /m. Bread Depth - 16.7 m {Mr Moon / Mr Moore} /m 15.6 m {Mr Moon / Mr Moore} /m. Tread Width - 133.0 m {Mr Moon / Mr Moore} /m. 133.0 m {Mr Moon / Mr Moore} /m. Contact. ------- Land Area - 28.6 sq.in. 27.0 sq.in. Ellipse Area - 39.6 " 38.3 " Ellipse Width - 4.8 in. 4.5 in. Ellipse Length - 9.5 in. 9.9 in. Contact Pressure - 66.6 lbs/sq.in. 70.5 lbs/sq.in. Average Cover Weight - 41.1 lbs. 39.2 lbs. -------------- | ||
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).