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).
Design and construction of rivetless bonnets, specifically shutter placement and riveting.
Identifier | WestWitteringFiles\W\May1931-August1931\ Scan115 | |
Date | 31th August 1931 | |
Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} from Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. Ey. E.{Mr Elliott - Chief Engineer} ORIGINAL. Hs{Lord Ernest Hives - Chair}/Lid{A. J. Lidsey}2/AD31.8.31. X385 RIVETLESS BONNETS. With reference to Da{Bernard Day - Chassis Design}/Ev{Ivan Evernden - coachwork}2/M27.8.31, we are putting the shutter pivot centre in the middle of the flap on the experimental rivetless bonnet we are making because R.{Sir Henry Royce} very definitely pointed out on the standardisation sheet for flip flap shutters that he thinks this modification will make them easier to open, a point which he thinks needs improvement. With regard to PN{Mr Northey}'s request for shutter symmetry, this was made in Sg{Arthur F. Sidgreaves - MD}'s presence when they approved of the now standardised flip flap shutters. It was thought that the distance between the edges of the middle and outer shutters should be twice the distance from the edge of the outer shutters to the bonnet ends thus :- [Diagram showing a bonnet side with four shutters. The spacing from the end to the first shutter is marked 'x"'. The spacing between the first and second shutter is '2x"'. The spacing between the third and fourth shutter is '2x"'. The spacing from the fourth shutter to the other end is 'x"'.] This was not possible at the time because it was necessary to use up the existing bonnet sides already panelled for the sliding type of shutter. We are trying countersunk rivets for the flip flap shutters because you definitely asked us to do so in Da{Bernard Day - Chassis Design}/Ev{Ivan Evernden - coachwork}2/M23.6.31, in addition Sg.{Arthur F. Sidgreaves - MD} approved of countersunk rivets for the flip flap shutters (Sg{Arthur F. Sidgreaves - MD}18/26.7.31). The appearance of these was pointed out to him at the time (some of them had cracked the paint) and it was agreed that the appearance was less unsightly than snap headed rivets. The light along the bonnet sides is always very much worse than on the top panels and small defects are difficult to notice. Our chief reason for not proceeding with N.Sch.3304 was that on the drawing it is stated that you do not like the construction very much because it is feared the side plate may unfold the hinge. You will recollect you gave us this design after we had sent you particulars of the | ||