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).
Dimensions and modifications for piston scraper rings on Kestrel and Peregrine engines.
| Identifier | ExFiles\Box 2\1\ B002_136 137-page09 | |
| Date | 9th March 1933 | |
| X 136. FILES. 9.3.33. PISTON SCRAPER RINGS. Dimensions of the perfect circle ring fitted to our various engines are as follows (Diagram labels: A, B, C) A.{Mr Adams} B. C. Kestrel IB. .188 .085 .050 Kestrel IS .188 .125 .030 'B' .023 Peregrine .138 .080 .029 A further modification to both types of Kestrel rings that has improved the oil consumption is a .015" chamfer on the top edge. (Diagram labels: .015" Chamfer, 45 deg.) Test Bed consumption for Peregrine At 4000 r.p.m. 1 pt/hr. At 4750 r.p.m. 1 1/4 pts/hr. = .0215 pts/BHP/Hr. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||