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).
Potential solutions for engine retard vibrations.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan158 | |
| Date | 1st March 1924 | |
| TO HS.{Lord Ernest Hives - Chair} B, RG.{Mr Rowledge} DA.{Bernard Day - Chassis Design} ) FROM R.{Sir Henry Royce} Copy to BY.{R.W. Bailey - Chief Engineer} PN.{Mr Northey} SECRET. R3/M14. 3. 24. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. re. RETARD VIBRATIONS. V9550 I have been thinking that these are the most difficult features that we have to study for which we have not a definite policy in hand that promises to clear the matter. Outside the period which must be cured by lining up to the 40/50. I understand HS.{Lord Ernest Hives - Chair} still says those we can feel are definitely worse than the 40/50. or Hispano. I have suggested that these are from torque re-actions; they cannot be done away with and I conclude cannot be reduced more than 10% by lightening the parts and also by about 10% through increasing the length of the rods, so that we can again only reduce the vigour but the periodicity is very fast and it may be that there is a corresponding period in the engine mounting with and without the dampers on the front end of the engine. So that if the trouble of the period in the drive is cured by stiffness increasing it beyond the engine speed as it must be in 40/50. it is no use doing anything to the flywheel and crankshaft. The work on the rods etc cannot alter its periodicity, and can only decrease its vigours to 80% of its present value, when it will about equal the 40/50. so it may mean a lighter engine more rigidly mounted on an effectively stiffer frame, or the remaining elasticity of the mounting to be damped. I therefore here ask if the vibration that can be felt after the stiffer shaft is fitted is a period, or partly due to one or more periods of the engine in its mounting? R.{Sir Henry Royce} | ||