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 comparing the mechanical efficiency of Aerolite & E.B. 1299 pistons against R.P.M.
| Identifier | ExFiles\Box 144\3\ scan0032 | |
| Date | 26th February 1934 | |
| B.V. 20 COMPARISON OF MECHANICAL EFFICIENCY (AEROLITE & E.B. 1299 PISTONS) UNIT Nº B.6 I.H.P. 180 160 140 120 100 80 60 40 20 AEROLITE PISTONS E.B. 1299 PISTONS R.P.M. 500 1000 1500 2000 2500 3000 3500 4000 4500 MECHANICAL EFFICIENCY % 100 90 80 70 60 AW 26/2/34 | ||