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).
Lap speeds and performance data for a car with a high compression head and Aerolite pistons, tested at Brooklands.
| Identifier | ExFiles\Box 155\1\ scan0174 | |
| Date | 1st May 1935 | |
| S/W. To Rm.{William Robotham - Chief Engineer} from Lp.{Mr Lappin} Copy to Bn.{W.O. Bentley / Mr Barrington} X1320 Lp.{Mr Lappin}8/LAM.1.5.35. Re: 4.B.IV. HIGH COMPRESSION HEAD, AEROLITE PISTONS - BROOKLANDS. As requested, I got some lap speeds on the above car yesterday, and perhaps Bn.{W.O. Bentley / Mr Barrington} would like to check these figures in the near future when convenient:- 4.B.IV. Weight, front 1725 lbs., rear 2059 lbs. TOTAL 3784 lbs. Throttle not fully open, cut out shut. Lap Speed 86.62 m.p.h. 0 to 30 1st gear 5 secs. 1/2 mile from 10 m.p.h. 37.5 secs. Lap Speed cut out open 88.62 m.p.h. Throttle full open. Lap Speed cut out shut 89.09 M.P.H. Lap Speed cut out open 90.72 M.P.H. (2 runs). 1/2 straight 93.26 M.P.H. 1/2 mile from 10 M.P.H. 35.3 seconds. FAIREY'S B.II.BN.{W.O. Bentley / Mr Barrington} Lap Speed cut out open 86.39 M.P.H. (2 runs). 1/2 mile from 10 M.P.H. 36.7 seconds (2 runs). 1/2 mile straight 89.-- M.P.H. Weight, front 1674 lbs. rear 2021 lbs. TOTAL 3695 lbs. Fitted with Bumper Bar. Lp.{Mr Lappin} | ||