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 of estimated vs achieved weight and cost variations for various vehicle components.
| Identifier | ExFiles\Box 92\6\ scan0106 | |
| Date | 30th January 1937 guessed | |
| SECTION. WT. VARIATION FROM STANDARD. COST VARIATION FROM STANDARD. Original Estimate Achieved. (1) Frame Wraith Thickness 60 lbs 65 lbs No change. (2) Alum in front Suspension 40 " 24 " + about £1. 10. - (3) Magnesium Gearbox Clutch pit Bottom half 30 " 25 " + " £2. - - (4) Substitute Continental rear road springs for P.III springs. 40 " 48 " - £1. 3. 7 (5) Engine Unit 45 " 86 " (without including saving on 4 port cylinder head) - £25 [STRIKETHROUGH] - 1. 12. - (6) 20/25 Dynamo & Battery 20 " 20 " Not made yet. (7) Flexible Flywheel 20 " - - 6. 10. - (8) Exhaust System 50 " 50 " - 16. - - (9) Brake lay-out 40 " 68 " No change. (10) Petrol Tank. 5 " 8 " - 4. 17. 6 (11) Steering Gear and Levers 10 " 19 " - about 10. - (12) Radiator & Bonnet 20 " 40 " - 1. 10. - (13) Lockheed Jacks 20 " 20 " - 3. - (14) Lightened Bumper Bar 15 " 11 " No change. (15) Body brackets & Spare wheel carrier lightened Nil 16 - 5. 10. - (16) Hardy Spicer Propeller Shaft. Nil Nil ----- ----- --------- 415 " 500 " 59. 6. 1 ===== ===== ========= | ||