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).
Test report on piston development for the Buzzard evaporatively cooled engine.
| Identifier | ExFiles\Box 178\4\ img088 | |
| Date | 8th January 1932 | |
| WORK CARRIED OUT ON PISTON DEVELOPMENT FOR BUZZARD EVAPORATIVELY COOLED TYPE TEST. Test No. | Engine No. | Date of test | Spec'n Ref. | Type of Piston. | Details of piston | Remarks. ---|---|---|---|---|---|--- 1 | 13 | 8.1.32 | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}7/L.S.4.1.32 | E.35621 | Lands taper .033" to .025" clear Side roller .033" Skirt parallel .023" clear | Standard Buzzard Piston 2 | 13 | 10.3.32 | RHC{R. H. Coverley - Production Engineer}/WBCA/L.S.8.3.32 | E.35621 | Piston ring gaps increased Top .010" - .018" Inter .014" - .022" Scraper .014" - .020" | 3 | 5 | 22.2.32 | RHC{R. H. Coverley - Production Engineer}/WBCA/L.S.24.2.32 | E.34294 | Lands taper .045" to .031" clear Skirt parallel .033" clear Side relief .045" | 1929 "H" engine piston 4 | 5 | 7.3.32 | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}3/L.S.7.3.32 | E.34294 ground to Ex.8032 | Top land .045" clear Inter. lands .065" clear Skirt parallel .033" clear Side relief .033" | 5A | 5 | 16.3.32 | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}5/L.S.21.3.32 | E.34294 ground to Ex S.1642 | Top land .045" clear Inter lands .053" clear Top of skirt .034" clear with .003" barrel Lower half of skirt .028" clear | R.30 T.T. Profile Best piston tried Cleared on 5 for but rejected on latter after 2 hrs 5B | 13 | 1.4.32 | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}1/L.S.4.4.32 | | | 6 | 13 | 19.4.32 | RHC{R. H. Coverley - Production Engineer}/WSC{W. S. Cassel}3/L.S.22.4.32 | E.34294 ground to Ex.8171 | Top land .057" clear Inter lands .062" clear Top of skirt .044" clear with .003" barrel Lower half of skirt .044" clear | 39 T.T. Profile with .010" extra clearance. 7 | 15 | 29.4.32 | RHC{R. H. Coverley - Production Engineer}/S2C4/L.S.2.5.32 | E.35621 ground to ExS.1673 | Top & Inter lands parallel .045" clear Top half of skirt taper to .0285" clear Lower half of skirt parallel .023" clear Eccentric relieving .045" | Run at reduced power. | ||