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).
Alteration to the 'D' Type keyed change gear shaft with a modified bush and bearing.
| Identifier | ExFiles\Box 15\5\ Scan017 | |
| Date | 24th September 1926 | |
| RR 288a (10H) (SL 72 18-7-23) MP 274954A X7310 COMPLETED 19.10.26 ALTERATIONS TO R.R. AERO ENGINE PARTS. 40/50 HP. CHASSIS. STAMP: CONDOR EAGLE FALCON HAWK DATE: 24.9.26 X No.: T520 7310 Drawing No.: G.74927 Part List: G.74908/11 Description of Parts: "D" TYPE C.H.N.S. KEYED TYPE CHANGE GEAR SHAFT - MODIFIED BUSH AND BEARING. Origin: To prevent grit getting bush and shaft causing change speed lever to bind. Experimental Test Report: This improved design got over the binding effect when changing from 2nd. to 3rd. or direct gears. The binding was caused by wear of the bush and scoring of the shaft with grit etc. 10,000 miles in France fitted to 12-E.X. The change speed lever was free from jamming throughout the test. There was no sign of cutting or scoring of the shaft due to grit etc. Air Ministry consent obtained difference in weight. "A"-Scrap and replace at all costs. "B"-Scrap and replace on those engines in Works. "C"-Scrap present stock and replace on all engines not yet handed to test. "D"-Use up existing stock. Alteration effective on future engines. Weight of Old Part: - Cost of Old Part: £ 18s 6d Weight of New Part: - Cost of New Part: £ 19s 6d Difference per Engine: £ 1s 0d. increase. Signature of Mr. De LOOZE that above is correct: My/Rh.{R. Hollingworth} SIGNATURES | DATE | REMARKS MR JOHNSON C.W.B. | 25.9.26 | Agreed. CWB. MR. B. JOHNSON | 18.10.26 | Agreed. B.Johnson. MR. ROYCE | 1.10.26 | Agreed. FHR. MR. WORMALD | 27.9.26 | Agreed. Wor.{Arthur Wormald - General Works Manager} MR. ROWLEDGE | 27.9.26 | Agreed. Rg.{Mr Rowledge} MR. DAY | 2.10.26 | Agreed. Da.{Bernard Day - Chassis Design} MR. BAILEY | 11.10.26 | Agreed. BY.{R.W. Bailey - Chief Engineer} MR. PLATFORD | 27.9.26 | Agreed. EP.{G. Eric Platford - Chief Quality Engineer} MR. ELLIOTT | 1.10.26 | Agreed. E.{Mr Elliott - Chief Engineer} MR. HIVES | 24.9.26 | Agreed. Hs.{Lord Ernest Hives - Chair} Mr. Northey. | 29.9.26 | Copied PN{Mr Northey}/ | ||