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).
Comparison table of ground and buffer clearance measurements for Spectre, Essex 6, and Cadillac models.
| Identifier | ExFiles\Box 4\1\ 01-page105 | |
| Date | 12th September 1934 | |
| LL694 To Hs{Lord Ernest Hives - Chair}/Rs.{Sir Henry Royce's Secretary} Hs{Lord Ernest Hives - Chair}/FD.{Frank Dodd - Bodies}5/KW.12.9.34. Ground clearance taken with 5 normal passengers, full tank of petrol etc., and the front axle jacked to give normal full load buffer clearance - 2.8". SpectreCodename for Phantom III Essex 6 Cadillac Under front axle, lowest point 7.5" 8.75" 7.2" Under crankcase - 7.3" D.P. 9.5" Under front steering arm, Lowest point 7.2" 9.0" 9.1" Under Battery box 7.0" 9.1" 9.3" Under rear silencer,rear point 6.9" 8.85" 10.3" Under " " front " 6.5" 8.75" 10.15" Under front silencer 6.6" 8.55" - Under rear crossmember prop. shaft 6.5" - - Rear buffer clearance under the above loaded conditions, 5 passengers - N.S. 3.1" 3.9" 2.8" O.S. 3.3" 3.5" 2.7" Hs{Lord Ernest Hives - Chair}/F.Dodd. | ||