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).
Alterations to the Goshawk I and 11 silencer system.
| Identifier | ExFiles\Box 48\4\ Scan162 | |
| Date | 21th March 1933 | |
| To Da.{Bernard Day - Chassis Design} from E.{Mr Elliott - Chief Engineer} c. to CJ. c. to WCr. c. to Hs.{Lord Ernest Hives - Chair} c. to BY.{R.W. Bailey - Chief Engineer} c. to EFC. X 4238 X.3588 "GOSHAWK 1 AND 11" SILENCER. The designs in connection with the silencing system will apply in principle to both "Goshawk 1" and 11. Referring to N.sch.684, would you kindly note that following alterations which Mr. Royce would like made:- (1) Mr. Royce would like you to alter the shape of the bracket from that previously asked for. The new shape should be as in sketch, namely, a complete four sided plate with four holes punched so as to leave diagonals for stiffening. Cut angle plates away thus:- (2) The cross tubes brazed into the cross member of the frame should be made considerably thinner, so as to be more equivalent to the strength of the bolts used and thus avoid carrying excessive weight about on the chassis. (3) Two ¼" bolts should be used for attaching the bracket to the cross member and they should be placed the other way round so that the plain part near the head carries the bracket, and not the threaded portion. (4) Two ½" bolts should be used for attaching the bracket to the silencer instead of the rivets shewn. (5) Four rivets should be used for each angle plate instead of seven on the silencer body, and the portions of the angles carrying the rivets can be shortened .3 at each side, leaving the pitch of the rivets about .875. Referring to N.scheme 686:- (6) The in-coming pipe from the engine, and the swan-neck pipe should both be reduced in diameter from 1¾" to | ||