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).
Fan belt irregularity and mounting solutions for the Goshawk 11 engine.
| Identifier | ExFiles\Box 75\3\ scan0201 | |
| Date | 21th July 1923 | |
| To HS.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to CJ. c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} X4237 RL/M21.7.23. RE. GOSHAWK 11. FAN MOUNTING. X.4237 X.446 I see no reason for the fan belt irregularity of which you complain. We have never had this trouble down here. When a belt is new it should be uniform. As it wears it will be necessary to remove links, and when it is worn the whole belt should be thrown away. There should be no necessity for inserting new links in an old belt, which would we expect cause vibration on the fan mounting. I suggest that the stops may be the cause of trouble and not be necessary. If you do not like the spring mounting we should return to the original fixed mounting with hand adjustment, fixed and spring seems too much. The slip given on your diagram for the 30 lbs. spring tension seems excessive - may be an error in experimenting. It should be a great advantage if we could see the larger fan pulley which we understand would be a ratio of 1 to 1 with crankshaft: less cause for vibration. Other people use spring mounting for their fans. Sunbeam 15 HP. (2/3rds. Goshawk) use no other fan than the large fan and radiator we supply - should be O.K. if fan runs slower, especially if the exit for the air is free. Tests this combination, i.e. freer exit, slower fan, - an extremely efficient arrangement. R.{Sir Henry Royce} | ||