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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 report for flip-flap type bonnet ventilators.

Identifier  ExFiles\Box 171\1\  img266
Date  8th July 1931
  
RR 755 (10M) (5459. 24-10-30) 6/3185.
COMPLETED 21.11.31.
STANDARDISATION OF CHASSIS PARTS.
Date 8.7.31
No. 1085/726
Drawing No. N.Sch. 3232
Part List
Description of Parts. FLIP FLAP TYPE BONNET VENTILATORS.
Origin. To improve appearance and facilitate operation.
Experimental Test Report.
Fitted to 20-EX Appearance and ease of operation approved by Sales.
Road Test Report.
Tests at present in progress on 25-EX in France indicate that this type of ventilator is not less effective than present sliding shutter type.
Weight of Old Part.
Cost of Old Part. £ 1. 4. 11d.
Weight of New Part.
Cost of New Part. £ 2. 19. 5d.
Difference per Car.
Difference per Car. £ 1. 14. 6d. Increase.
Signature from Cost Dept. that above is correct. G/Rb.{R. Bowen}10.11.31. Wor.{Arthur Wormald - General Works Manager}
A Scrap and replace at all costs, including Chassis already delivered to Customers.
B Scrap and replace on Chassis in Works.
C Scrap present stock and replace on all Chassis not yet handed to test.
D Use existing stock Alteration effective on future Chassis.
Cost of Parts in Works which will be scrapped if commenced on:-
Series…£…
Series…£…
Series…£…
INITIAL DATE REMARKS
SG.{Arthur F. Sidgreaves - MD} 12.11.31. Agreed Sg.{Arthur F. Sidgreaves - MD}
R.{Sir Henry Royce} 10/7/31. Agreed TMR, this seems a good move; owing to there
WOR.{Arthur Wormald - General Works Manager} 9.7.31. being so little difference which way anything fits it & it looks as
C. 9.7.31. I thought the pivot should be central, because
RG.{Mr Rowledge} 9.7.31. Agreed Rg.{Mr Rowledge} it would make them Easier to open, a point
DA.{Bernard Day - Chassis Design} 11.7.31. Agreed Da.{Bernard Day - Chassis Design} I think needs improvement, & I much prefer them
BY.{R.W. Bailey - Chief Engineer} 9.7.31. Agreed By.{R.W. Bailey - Chief Engineer} this type of ventilators [struck out text] & lowers because
EP.{G. Eric Platford - Chief Quality Engineer} 7.7.31. Agreed EP.{G. Eric Platford - Chief Quality Engineer} they need not be open unless high speed & weather conditions demand
E.{Mr Elliott - Chief Engineer} 10.7.31. Agreed AE. Our old shutters are quite out of date –
PN.{Mr Northey} 10.7.31. Agreed PN.{Mr Northey} Our original scheme adopted almost 25 years ago.
HS.{Lord Ernest Hives - Chair} Agreed HS.{Lord Ernest Hives - Chair}
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