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).
Design drawing detailing the specifications for front and rear leaf springs for Perkins.
| Identifier | ExFiles\Box 41\1\ Scan055 | |
| Date | 2nd December 1925 guessed | |
| [LEFT SECTION - FRONT] TITLE: FRONT DIAGRAM ANNOTATION: VAR. TO PRODUCE FLAT CAMBER DIAGRAM MEASUREMENTS: 2975, 777.00 VERTICAL MEASUREMENTS: 350.00, 316.50, 273.00, 242.00, 213.00, 186.00, 161.00, 137.00, 117.00, 92.00, 30.00 LEAF IDENTIFIERS: MAIN, 2ND, 3RD - 1100, 4TH - 1050, 5TH - 950, 6TH - 1250, 7TH - 1200, 8TH - 1075, 9TH - 1025, 10TH - 750, 11TH - 425 [FRONT TABLE] HEADER: FRONT. DETAILS WITHIN THESE LINES ARE FOR PERKINS SPRINGS. COLUMNS: LEAF, A LENGTH OF LEAF, B THICKNESS OF LEAF, C WIDTH OF LEAF, D MAIN | 0.600 | 0.250 | 3.50 | FTTD 2ND | 0.500 | 0.250 | 3.25 | FTTD 3RD | 0.250 | 0.250 | 3.00 | FTTD 4TH | 0.500 | 0.200 | 2.75 | FTTD 5TH | 0.250 | 0.175 | 2.50 | FTTD 6TH | 0.100 | 0.175 | 2.25 | FTTD 7TH | 0.200 | 0.175 | 2.00 | FTTD 8TH | 0.100 | 0.175 | 1.75 | FTTD 9TH | 0.125 | 0.175 | 1.50 | FTTD 10TH | 0.400 | 0.175 | 1.25 | FTTD 11TH | 0.200 | 0.175 | 1.00 | FTTD NOTE: THESE TWO LEAVES HAVE BOLT TAPS FOR REBOUND LIPS [CENTER COLUMN] TITLE: CAMBER MAIN 2.250 2ND 2.000 3RD 2.300 4TH 2.250 5TH 2.500 6TH 2.45 7TH 2.125 8TH 2.000 9TH 1.975 10TH 2.45 [RIGHT SECTION - REAR] TITLE: REAR DIAGRAM ANNOTATION: VAR. TO PRODUCE FLAT CAMBER DIAGRAM MEASUREMENTS: 30.475DIA, 3.200 VERTICAL MEASUREMENTS: 132.00, 108.00, 146.00, 180.00, 216.00, 257.00, 302.00, 352.00, 389.00, 419.00, 437.00 [REAR TABLE] HEADER: REAR. DETAILS WITHIN THESE LINES ARE FOR PERKINS SPRINGS. COLUMNS: LEAF, A LENGTH OF LEAF, B THICKNESS OF LEAF, C WIDTH OF LEAF, D MAIN | 3.000 | 0.335 | 3.25 | 4.160 2ND | 3.000 | 0.275 | 2.75 | 4.160 3RD | 7.000 | 0.280 | 2.50 | 4.160 4TH | 7.000 | 0.215 | 1.75 | 4.160 5TH | 10.000 | 0.200 | 1.50 | 2.175 6TH | 7.000 | 0.240 | 1.25 | 2.175 7TH | 6.500 | 0.245 | 1.00 | 2.175 8TH | 6.000 | 0.217 | 0.750 | 2.160 9TH | 3.000 | 0.195 | 0.500 | 2.150 10TH | 4.500 | 0.185 | 0.250 | 2.125 NOTE: THESE TWO LEAVES HAVE BOLT TAPS FOR REBOUND CLIPS | ||