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 modified Hardy fabric coupling for dynamo and magneto drives to prevent fabric distortion.
| Identifier | ExFiles\Box 171\1\ img043 | |
| Date | 24th September 1926 | |
| RR 288A (10H) (SL 72 18-7-23) MP 274954a ORIGINAL. COMPLETED 19.10.26 ALTERATIONS TO R.R. AERO ENGINE PARTS. 40/50 HP. CHASSIS. (Strikethrough) DATE 24.9.26 Description of Parts: MODIFIED HARDY FABRIC COUPLING FOR DYNAMO AND MAGNETO DRIVES. Origin: To prevent distortion of fabric which happened when using rivets to fasten driving pieces on. The mod: is to use ferruls which do not damage fabric. Experimental Test Report: With the present fabric coupling rivets are used to fasten the driving pieces and are bent in the operation and damage the fabric. In some instances the material is squashed up causing the fabric to bulge out between the driving dogs and cause the coupling to deteriorate quickly. The modification does away with the rivets, and ferruls are pressed in, limits being allowed for this. The modified coupling was fitted to 12-EX - ran 10,000 miles. At the end of test its condition was as good as when first fitted. Less likelihood of deterioration. Signature of Expl. Dept. that above is correct Weight of Old Part Cost of Old Part £ 7s. 3d. Weight of New Part Cost of New Part £ 4s. 9d. Difference per Engine Difference per Engine £ 2s. 6d. saving. Signature of Mr. De LOOZE that above is correct My/Rb.{R. Bowen} X No. 7100 (Strikethrough) 8100 Drawing No. E.74506 Part List 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. Cost of Parts in Works and Stores which will be scrapped if commenced on:- SIGNATURES | DATE | REMARKS [Redacted] C.W.B. | 25.9.26 | Agreed. CWB. MR. B. JOHNSON | 18.10.26 | Agreed. B. Johnson, MR. ROYCE | 1/10/26 | Agreed HR (handwritten) MR. WORMALD | 27.9.26 | Agreed. Wor.{Arthur Wormald - General Works Manager} MR. ROWLEDGE | 27.9.26 | Agreed. Rg.{Mr Rowledge} MR. DAY | 1/10/26 | Agreed Da{Bernard Day - Chassis Design} (handwritten) MR. BAILEY | 10.10.26 | 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 OE (handwritten) MR. HIVES | 24.9.26 | Agreed. Hs.{Lord Ernest Hives - Chair} Mr. Northey. | 29.9.26 | Agreed. PN.{Mr Northey} | ||