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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).
Standardisation of a complete exhaust system with a resonant silencer for chassis parts.

Identifier  ExFiles\Box 19\1\  Scan259
Date  6th April 1933
  
RR 785 (10H) (30405, 21-4-32) BM. S/6382/4.
X7120
COMPLETED 6.4.33.
STANDARDISATION of CHASSIS PARTS.
Description of Parts. Complete Exhaust System with Resonant Silencer.
Origin. To obtain freer exhaust with consequent less heat. To overcome booms from exhaust. To reduce cost.
Date 9.32.
7120
X No. 7230.
Drawing No. 8808.
Part List
Experimental Test Report.
The resonant silencer overcomes the periods of booms both on the forward and over-run. There is considerably less back pressure. Fitted to all experimental cars with consistent results.
Road Test Report.
Fitted to 19-EX and ran 10,000 miles in France. With the exception of being slightly more noisier, the exhaust was free from booms, and was trouble-free throughout the test.
PHANTOM
(CONTINENTAL TYPE ONLY)
Weight of Old Part.
Weight of New Part.
Difference per Car.
Cost of Old Part. £ 19-5-11
Cost of New Part. £ 14-7-5
Difference per Car. £ 4-18-6 Decrease
Cost of Parts in Works which will be scrapped if commenced on:-
Series..........£.........
Series..........£.........
Series..........£.........
Signature from Cost Dept. that above is correct. GRL 4/3/33
INITIAL | DATE | REMARKS
SG.{Arthur F. Sidgreaves - MD} | 4-4-33 | Agreed Sg.{Arthur F. Sidgreaves - MD}
R.{Sir Henry Royce} | 1.10.32. | Agreed FHR.
WOR.{Arthur Wormald - General Works Manager} | 24.9.32. | Agreed Wor.{Arthur Wormald - General Works Manager}
C. | 26.9.32. | Agreed C.
RG.{Mr Rowledge} | 6.9.32. | Agreed Rg.{Mr Rowledge}
DA.{Bernard Day - Chassis Design} | 26.9.32. | Agreed Da.{Bernard Day - Chassis Design}
BY.{R.W. Bailey - Chief Engineer} | 26.9.32. | Agreed By.{R.W. Bailey - Chief Engineer}
EP.{G. Eric Platford - Chief Quality Engineer} | 23.9.32. | Agreed EP{G. Eric Platford - Chief Quality Engineer} & Mx.{John H Maddocks - Chief Proving Officer}
E.{Mr Elliott - Chief Engineer} | 11.10.32 | Agreed AE.
PN.{Mr Northey} | 22.9.32. | Agreed PN.{Mr Northey}
HS.{Lord Ernest Hives - Chair} | | Agreed Hs.{Lord Ernest Hives - Chair}
  
  


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