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).
Comparative table of stiffness and inertia properties for various engine models.
| Identifier | ExFiles\Box 65\4\ scan0199 | |
| Date | 19th May 1927 guessed | |
| A.{Mr Adams} B. C. D.{John DeLooze - Company Secretary} E.{Mr Elliott - Chief Engineer} F.{Mr Friese} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} H.{Arthur M. Hanbury - Head Complaints} I. J.{Mr Johnson W.M.} K G-1 14,750 31.650* .03895 .794* 1.995* 1.250* 1.33 2.93% .0153 38,900 G-11 16,220 30.975* .0419 .8084* 1.995* 1.250* 1.33 3.15% .01796 41,600 Phantom. 43,500 40.600* .147 1.107* 2.6245* 1.50* 4.165 3.52% .0356 147,000 Lorraine. 28,350 24.295* .0575 .875* 1.890* .80* 1.211 4.75% .0320 57,500 Column. Heading. A.{Mr Adams} Engine. B. Stiffness ; lbs/ft/radian. C. length ; ins. D.{John DeLooze - Company Secretary} Polar M.{Mr Moon / Mr Moore} of I. calc. from B ; ins4 E.{Mr Elliott - Chief Engineer} Dia. of plain shaft having same stiffness ; ins. F.{Mr Friese} Dia. of journal ; ins. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Bore of journals ; ins. H.{Arthur M. Hanbury - Head Complaints} Polar M.{Mr Moon / Mr Moore} of I. of journals - ins4 I. D.{John DeLooze - Company Secretary} expressed as %age of H.{Arthur M. Hanbury - Head Complaints} J.{Mr Johnson W.M.} Distributed inertia per ft. Slugs/ft2. K.{Mr Kilner} Stiffness per ft. lbs/ft/radian. Hs{Lord Ernest Hives - Chair}/Tsn. X8010 | ||