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).
Notes from a visit by Mr. F.G. Parnell concerning Lockheed brakes, detailing points discussed about clearances, handbrake travel, and master cylinder size.
| Identifier | ExFiles\Box 121\1\ scan0290 | |
| Date | 11th June 1940 | |
| 1029 To Rm.{William Robotham - Chief Engineer} from Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions} c. to Mr. Parnell. c. to Ev.{Ivan Evernden - coachwork} c. to Rm{William Robotham - Chief Engineer}/MHR.{M. H. Rigby} Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}1/JH.11.6.40. Notes on visit of Mr.F.G. Parnell re Lockheed Brakes - June 10th. 1940. Points discussed. (1) Clearance between part of wheel cylinder external to brake carrier plate and any obstructions. (a) Front. It was discovered that on the lower front cylinder the banjo securing set screw was uncomfortably close to the cross steering lever and could not be withdrawn. After discussion and investigation of various possibilities it was decided to turn the brakes through 90° so that the shoe operating cylinders lay on the horizontal centre line. (b) Rear. It seemed probable that there would be no close points here in view of the fact that the bisector housing did not reach as far out from the brake carrier plate as the rear spring. The drawings brought by Mr. Parnell of the pipe connections (which are incomplete in not showing bleed screws) will be used to determine this point definitely. (2) Handbrake travel. The travel of the rods for handbrake application at the bisector is needed for the handbrake linkage layout, and Mr. Parnell promised to let us know what this is. (3) Master Cylinder Size. The maximum size of tandem cylinder we can install from the point of view of levers clearing the underside of the pedal and floor boards is 3/4" dia. Mr. Parnell pointed out that it may not be possible, from their point. P.T.O. | ||