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).
Blueprint detailing the G II & G III brake linkages, performance calculations, and efficiency data.
| Identifier | ExFiles\Box 5\3\ 03-page130 | |
| Date | 1st March 1928 | |
| G II & G III BRAKE LEVERAGES --- SECTION 1: GII BRAKE LEVERAGE DIRECT REAR BRAKING G II P x (12.75 / 4.5) x (2.5 / 2.5) x (6 / 2.3) x 14 = 422 P Diagram Labels: DRUM DIA 14 .43 CAM --- SECTION 2: GIII BRAKE LEVERAGE DIRECT REAR BRAKING P x (10.00 / 4.35) x (1.187 / 1.350) x (1.875 / 3.150) x (6 / 2.3) x (2.5 / .43) x 14 = 335 P SERVO REAR BRAKING P x S x (15 / 4.35) x (1.187 / 1.35) x (2.25 / 3.150) x (6 / 2.30) x (2.5 / .43) x 14 = 405 S.P SERVO FRONT BRAKING P x S x (15 / 4.35) x (1.187 / 1.35) x (2.25 / 2.25) x (3.35 / .4) x 13 = 481 S.P Diagram Labels: 13 DRUM DIA, .4 CAM DRUM DIA 14, .43 CAM --- TABLE: DISTRIBUTION FOR VARIOUS SERVO EFFICIENCIES Headers: FOOT RATIO TO REAR | SERVO BRAKING TO REAR | SERVO BRAKING TO FRONT | TOTAL BRAKING TO REAR | TOTAL BRAKING | SERVO MULTIPLY | % BRAKING FRONT | % BRAKING REAR Row 1: 335 | 405 S | 481 S | 740 S | 335 | 0 | 0 | 0 Row 2: 335 | 101 | 121 | 436 | 557 | .25 | 21.7% | 78.3% Row 3: 335 | 202 | 240 | 537 | 777 | .50 | 31.0% | 69% Row 4: 335 | 304 | 360 | 639 | 999 | .75 | 36% | 64% Row 5: 335 | 405 | 481 | 740 | 1221 | 1.00 | 39.5% | 60.5% Row 6: 335 | 810 | 962 | 1145 | 2107 | 2.00 | 45.6% | 54.4% Row 7: 335 | 1215 | 1443 | 1550 | 2993 | 3.00 | 48.3% | 51.7% --- GRAPH: BRAKING TO FRONT & REAR G III Boxed Text: UNITS USED, LOAD THAT WOULD BE APPLIED TO THE EXTREMITY OF 1 SHOE BY THE CAM MULTIPLIED BY FOUR TIMES DRUM DIA. Axes: Y-axis (left): BRAKING UNITS Y-axis (right): % BRAKING X-axis: CONVENTIONAL SERVO MULTIPLYN Curve Labels: % REAR BRAKING, TOTAL BRAKING, % FRONT BRAKING, REAR BRAKING, FRONT BRAKING Pointers: GII DIRECT REAR 422 UNITS GIII DIRECT TO REAR 335 UNITS --- STAMP: ROLLS-ROYCE LTD. DERBY PHOTOGRAPHIC DEPT. REF. No. G / 3.28 DATE 3 . 28 | ||