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).
Experimental department report on the balancing of Peregrine crankshafts.
| Identifier | ExFiles\Box 115\2\ scan0374 | |
| Date | 10th January 1939 | |
| R.R. 306. ST.{Capt. P. R. Strong} 74907/4/11/38. C.E. [STAMPED TEXT CROSSED OUT IN RED] 1020 EXPERIMENTAL DEPARTMENT REPORT. REFERENCE:— Lr{Mr Ellor}/Lov{Mr Lovesey}/PLY.2/WJ.10.1.39. Subject of Report:— BALANCING OF PEREGRINE CRANKSHAFTS. General Conclusion:— Bearings General File. The characteristics of lead bronze appear to be such that it will crack under shock loads and not under relatively high smooth loads; as far as the end main bearings are concerned there is less hammering with an unbalanced shaft, but the centre main bearing has to carry heavier loads which are comparatively smoothly applied, from this point of view therefore an unbalanced shaft would seem to be an improvement. Further the Peregrine crankcase has been stiffened to carry heavier loads than Kestrel and considering the experience on Peregrine I No.3. and the saving in weight of 19 lbs. an unbalanced shaft would be a very promising line of development on Peregrine engines at higher rating. ---------------- Copies of Report Circulated to:— E.{Mr Elliott - Chief Engineer} Bn.{W.O. Bentley / Mr Barrington} Lr.{Mr Ellor} Lr{Mr Ellor}/Lov.{Mr Lovesey} Rm.{William Robotham - Chief Engineer} Report to be noted for further action by:— Test carried out on:— By:— Test No. Date:— | ||