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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).
List of proposed design modifications and investigations for various vehicle components, sheet 2.

Identifier  ExFiles\Box 6\6\  06-page110
Date  11th January 1937 guessed
  
(sheet 2)

(7) Rear brakes N.Sch.4839. Design mod will be instructed deleting the special bolts, rivetted over, for camshaft bearing brackets etc.

(8) Rear brake dust cover. Investigation in hand to see whether this can be used in aluminium in place of mild steel.

(9) Rear brake oil catcher. This is a difficult piece to produce. Design mod. to be instructed to simplify the piece.

(10) Soldering of oil catchers to brake anchorage plates - agreed this is no longer necessary subject to successful trial on experimental car. Future Wraith chassis should be built up without the soldering operation. The oil catchers being retained by rivets only.

(11) Rear hub bearing nut lock plate CW.558. This type of lock plate entails considerable hand filing to fit it. Design will instruct modification.

(12) Oil drains on brake gear. It was intended by design that there should be existing pieces. BY/T&D will alter detail instructions and L.O.P's.

(13) Lower triangle outer bearing. Design will modify the design of this spherical bearing so as to use a long bolt to retain it to the triangle levers. This will simplify the erection considerably.

(14) Brake operation fulcrum pin on yoke N.Sch.4844. Design modification to be issued providing parallel fixing for the fulcrum pin in place of present taper.

(15) Rear jack brackets on axle tubes. Design to be instructed for a split jack bracket in aluminium. Do not proceed with dies for the existing design.

(16) Flywheel Balancing screws. These are expensive as at present instructed. Design mod to be issued. This also applies to Phantom III.

(17) Bonnet rest plates on dashboard. A design for a wider fabric bonnet rest and aluminium angle pieces will shortly be issued.
  
  


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