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).
Issues with propeller measurement accuracy and dismantling difficulties due to inaccessible bolts.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan88 | |
| Date | 12th June 1925 | |
| R.R. 499A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. -5- Expl. No. REF: Hs{Lord Ernest Hives - Chair}/TAG/LG15. 8.25. way apart for accurate measurements and any readings in between, say .5°, are only approximate. It would be advantageous to introduce a vernier scale. The width of the marks - .025", and the number of degrees to the inch - 16. We were unable to take the propeller off the engine as one unit, the blades had to be taken off separately and then the hub. This was due to the bolts turning in the hub and the engine flange. It is not possible to prevent this happening as some of the bolt heads are covered by the blades sleeves and there is no means of using a spanner to stop the bolts turning! A locking device for these bolt heads would be very useful. If the propeller has to be dismantled every time, it means re-setting the blades when it is re-fitted to the engine. Hs{Lord Ernest Hives - Chair}/TAG. | ||