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).
Tests and modifications to a Phantom II throttle spring arrangement to resolve sluggish movement.
| Identifier | ExFiles\Box 13\4\ 04-page156 | |
| Date | 9th May 1933 | |
| X7680 c. Es/Rm{William Robotham - Chief Engineer} from Mx.{John H Maddocks - Chief Proving Officer} Mx{John H Maddocks - Chief Proving Officer}10/T9.5.33. THROTTLE SPRING P.II Referring to EB/HP26.4.33 and Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}1/ET29.4.33. With regard to the occasional trouble on Production Test of throttle movement being sluggish at slow speeds and not definitely closing. We have tried out the modification to the present arrangement as per EB/HP26.4.33 on a carburetter which was unsatisfactory in this respect. We have also tried on the same carburetter the scheme L.I.C.3412 fitted up by the Experimental Dept. With either arrangement the closing of throttle is quite positive. Herewith are some figures relating to the three schemes above referred to. (1) Present arrangement. 5/8" Lever set at 30° below horizontal in closed position. Spring length throttle closed 2.150 = 3 1/2 lbs. " " open 2.9 = 8 lbs. (2) Modification to present scheme as per EB/HP26.4.33. 1" lever set horizontal in closed position. not at 9° as shown on sketch, and spring fitted direct to pin on bottom anchorage with lower connecting link plate deleted. Spring length throttle closed 2.3" = 4 1/2 lbs. " " open 3.3" = 10 lbs. We find on actually testing a few samples that the spring takes a permanent set if extended more than 3.9". The load to operate accelerator pedal with this arrangement is 4 lbs. and is not appreciably greater than with the existing arrangement. contd- | ||