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).
Comparing the inertia and weight of original, and lightened/improved Phantom and Silver Ghost flywheel and clutch units.
| Identifier | ExFiles\Box 73\1\ scan0240 | |
| Date | 10th June 1926 | |
| Expl. Report. X9930 To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. Cr.{Mr Cra???ster / Mr Chichester} F.G. Yor. C. F.G. Hives C. Day. Ry. C. Hs{Lord Ernest Hives - Chair}/ACL. 7 Hs{Lord Ernest Hives - Chair}/ACL1/T10.6.26. INERTIA AND WEIGHT OF PHANTOM & SILVER GHOST FLYWHEEL & CLUTCH UNITS. X8300 X9300 X8840 Replying to El/M26.4.26. With regard to the proposed further lightening of the Phantom flywheel and clutch we supply the following information giving the polar moments of inertia and weights of the original Phantom, the lightened and improved and the Silver Ghost, flywheel and clutch units. Complete Flywheel & Clutch. | | Original Phantom. | Lighter & Improved & Recently Standardised. | Silver Ghost. | |---|---|---|---| | Wt. of complete unit. | 168.25 lbs. | 150 lbs. | 114.437 lbs. | | Rad. of gyration. (K) | .5147 ft. | .5111 ft. | .5504 ft. | | Polar mom. of inertia { W/g K² } | 1.385 | 1.217 | 1.076 | | 'I' relative to Silver Ghost. | 29% Greater. | 13% Greater. | - | | Wt. rel. to Silver Ghost. | 47% Greater. | 31% Greater. | - | The weights given do not include that of casing. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey. | ||