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).
Table detailing the particulars and specifications of four different outer springs.
| Identifier | ExFiles\Box 154\1\ scan0172 | |
| Date | 31th August 1934 guessed | |
| TABLE I. +3873 PARTICULARS OF OUTER SPRINGS. | | G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 81516 | G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 82235 | G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 82226 | G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 82234 | |---|---|---|---|---| | Spring Designation | A.O. | B.O. | C.O. | D.O. | | Wire Dia. | 0.625" | 0.650" | 0.650" | 0.650" | | Mean Dia. of Coils | 4.15" | 4.175" | 4.175" | 4.175" | | No. of coils(effective) | 7 | 7 | 7 | 7 | | Normal Load | 1750 lbs. | 2001 lbs. | 2076 lbs. | 2131 lbs. | | Deflection to normal position. | 3.825" | 3.815" | 3.950" | 4.065" | | Free Length | 10.825" | 10.815" | 10.950" | 11.065" | | Max. Load | 2426 lbs. | 2775 lbs. | 2850 lbs. | 2905 lbs. | | Max. Stress (Uncorrected) | 105,000 lbs/sq.in. | 107,500 lbs/in² | 110,400 lbs/in² | 112,700 lbs/in.² | | Min. Deflection. | 5.300" | 5.290" | 5.425" | 5.540" | | Rate per inch | 457.5 lbs. | 525 lbs. | 525 lbs. | 525 lbs. | | Rate per inch at wheel. | 62.6 lbs. | 72 lbs. | 72 lbs. | 72 lbs. | | Normally part of combination | 1000 lbs/wheel. | 1100 lbs/wheel. | 1200 lbs/wheel. | 1250 lbs/wheel. | | ||