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).
Necessity of lagging the 20 HP swan neck exhaust pipe.
| Identifier | ExFiles\Box 48\4\ Scan220 | |
| Date | 16th September 1924 | |
| 4238 To BY. {R.W. Bailey - Chief Engineer} from Hs. {Lord Ernest Hives - Chair} c. to EP. {G. Eric Platford - Chief Quality Engineer} c. to DA {Bernard Day - Chassis Design} /EV. {Ivan Evernden - coachwork} c. to Wor. {Arthur Wormald - General Works Manager} Hs {Lord Ernest Hives - Chair} /TMW/LG16.9.24. EP {G. Eric Platford - Chief Quality Engineer} /Thn7/H24.6.24. LAGGING OF 20 HP. SWAN NECK EXHAUST PIPE. We cannot say that our experience with the Experimental 20 HP. cars proves to us any necessity for lagging the above pipe. The floorboard or seat immediately above the swan neck does not get hotter than the general temperature of the wood after a long run. It should be remembered that the highest point of the swan neck on the 40/50 HP. is exactly level with the upper face of the frame channel, whereas a clearance of 2½" is given on the 20 HP. There is also a larger air space beneath the seats and better facilities for the heat to be carried away by draught, when car is running, on the 20 HP. We asbestos-lagged the swan necks on 7-G-11 and 6-G-11 in a similar manner to the 40/50 HP. except that ¼" rope was used instead of .375", but could not find that doing so made any difference to the boards after a good run. Hs {Lord Ernest Hives - Chair} /TMW. | ||