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).
Instruction sheet detailing a horsepower comparison test for a 40/50 engine with different induction pipes.
| Identifier | ExFiles\Box 74\4\ scan0156 | |
| Date | 18th May 1921 | |
| R.R. 26 10M Bks.) (SE 591 13-3-18). M.P. 189358 X3056 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Mr. Hives 18-5-1921 Order No. Customer's No. HPs{Horace Percy Smith - Experimental Factory Mgr} of 40/50 engines, high comp, 2" & 1 3/4" Induction Pipes compared, standard throttle in each case. B.P. Spirit. Table Data: First Header: 2" Second Header: 1 3/4" RPM | cut out open | cut out closed | cut out open | cut out closed --- | --- | --- | --- | --- 500 | 24 | 23.75 | 24 | 24 750 | 37 | 37 | 37 | 36.5 1000 | 47 | 46.5 | 47 | 46.5 1250 | 59.5 | 57.75 | 59 | 56.25 1500 | 70.75 | 64.5 | 69.25 | 65.25 1750 | 79.5 | 76 | 76.5 | 72.75 2000 | 85.4 | 79.25 | 80.5 | 75.25 2250 | 88 | 81 | 82.5 | 76.5 Signed: L.H.M. This Sheet must be filed on completion of the work. | ||