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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).
Log of design modifications and scheme details for the Spectre 12-Cylinder Engine and Wraith Chassis.

Identifier  ExFiles\Box 133\4\  scan0045
Date  12th June 1935
  
- 14 - BY.12/G.12.6.35.

SPECTRECodename for Phantom III 12-CYL. ENGINE.
-----------------------
N.Sch.4499 SpectreCodename for Phantom III. Jack Pad & Stabilizer (Modifies N.Sch.4485) Temporary Scheme. Recd. 23.5.35.
Detail drawings completed and issued ...... 27.5.35.

N.Sch.4501 Modfn. to Hand Brake Intermediate Levers to suit Horizontal Type hand brake lever...... Recd. 22.5.35.
Detail drawings completed and issued ...... 25.5.35.

WRAITH CHASSIS.
---------------
RR.Sch.774 Speedometer Drive. Recd.
N.Sch.4304 Modfns. to Gearbox Casing to accommodate larger Servo. Recd. 20.12.35.
N.Sch.4309 Servo for Semi-Servo System ................... Recd. 28.12.34.
N.Sch.4346 3rd. Motion Shaft as N.Sch.4206 but with thicker flange ................... Recd. 19.1.35.
N.Sch.4342 Engine - Gearbox Connecting Shaft ......... Recd. 25.1.35.
N.Sch.4294 Modfns. to Reduce Cost (Suggested) Gearbox. Recd. 9.5.35.
N.Sch.4488 Inspection Door for Actuating Gear and Disc Type Damper for Dual Balance Arm.... Recd. 18.5.35.
N.Sch.4494 Modfns. to Actuating Gear due to shortened pendulum lever, also increased leverage for 1st. Gear ................... Recd. 18.5.35.
N.Sch.4500 Lightening Servo Drive Shaft ............ Recd. 23.5.35.
The above schemes dealing with the gearbox are not being detailed, as we understand it is proposed to modify them and bring them into line with what has been done on SpectreCodename for Phantom III chassis.

LeC.4163 Crankcase, Crankshaft & Brgs .............. Recd. 15.12.34.
Detail drawings completed and issued ...... 27.5.35.

LeC.4165 Cylinder Head, Valve Gear & Valve Rocker Cover. Recd. 20.12.34.
Detail drawings completed and issued ...... 27.5.35.

LeC.4164 Camshaft & Tappet Mechanism ................. Recd. 15.12.34.
Detail drawings completed and issued ...... 5.6.35.

LeC.4166 Cylinder Head and Valve Lift Diagram ...... Recd. 20.12.34.
Detail drawings completed and issued ...... 5.6.35.

LeC.4212 Starter Motor Housing & Rear End of Crankcase. Recd. 18.12.34.
Detail drawings completed and issued ...... 2.4.35.

LeC.4259 Details of Cams ............................ Recd. 17.12.34.
Detail drawings completed and issued ...... 5.6.35.
  
  


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