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).
The horse power dissipated by Mark VI engine blocks under different conditions.
| Identifier | ExFiles\Box 131\1\ scan0361 | |
| Date | 23th October 1937 | |
| M 226 JOHN MARSTON LTD. To Messrs. Rolls Royce Limited, DERBY. (CONTINUED) -2- 23rd October, 1937 HORSE POWER DISSIPATED BY ROLLS ROYCE MARK VI BLOCKS. M.{Mr Moon / Mr Moore} P. H.{Arthur M. Hanbury - Head Complaints} BLOCK NO. DESCRIPTION 20 30 40 60 Z.63 Airways choked with feathers etc. 36.8 52.3 62.2 78.9 J.20 Block taken back to R.R. by Mr. Steadman 376X 49.1 63.5 75.9 92.1 C.94 Waterways choked, now being treated with Kyrac 51.2 65.3 74.1 91.7 K.94 Third customers matrix (now returned to Rolls Royce) 50.8 65.0 74.8 91.4 | ||