Test results and calculations for a throttle mechanism, comparing torque and load under different schemes.
| Identifier | ExFiles\Box 13\4\ 04-page150 | |
| Date | 29th April 1933 guessed | |
| Tests were then repeated with this scheme modified as originally suggested, i.e. spring arm was rotated 180° on throttle spindle and fixed in position with spring on opposite side of spindle (i.e. below spindle). These tests were carried out in exactly the same manner as the last ones - results shown below. Results. Spring Length-throttle closed, 2⅜". Load, " " " 3 lbs 9 ozs. Load just to move against spring, suction and bearings. - 3 lbs. (mean of 10 readings) Torques Spring torque 3 lbs 9 ozs x ⅞ = 3.12 lbs.ins. Torque to move throttle against spring and friction = 3 x 1.7/16 = 4.31 lbs. ∴ Frictional torque = 4.31 - 3.12 = 1.19 lbs.ins. Excess of spring torque over frictional torque = 1.93 lbs.ins. = 162% of frictional torque. Comparison of two schemes. Lec.3412. Throttle closed 18" Hg. depression. Frictional torque, 1.76 lbs.ins. Spring torque, 3.12 lbs.ins. Excess of spring torque over frictional torque = 77.3% of frictional torque. Bearings Loads. Load on bearings due to depression above throttle = 35.2 lbs. " " " " " " = 17.6 lbs/bearing. | ||
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).