Comparison of braking units for four car models, with analysis and proposed improvements for the J.III and Peregrine models.
| Identifier | ExFiles\Box 1\10\ B001_X106 TO X 110-page017 | |
| Date | 11th November 1932 | |
| 8 106- For Files. 11.11.32. 7360. x5360 J.III BRAKES & PEREGRINE(Experimental Bentley car never produced / Aero Engine). Comparing the four Cars on the road we get:- Braking Units. 40/50. 20/25. J.III peregrine(Experimental Bentley car never produced / Aero Engine). Direct. 377 377 240 220 Rear & Front Servo. 499 524 525 388 Peregrine(Experimental Bentley car never produced / Aero Engine) suffers from too little direct braking. If we make the pedal reach the boards sooner by increasing the direct braking, we can also increase the mechanical advantage between the servo and the shoe, as when the pedal hits the boards we are forced to take up a notch, therefore preventing the servo hitting the stop. On Peregrine(Experimental Bentley car never produced / Aero Engine), therefore the direct braking is increased from 220 units to 377 units by increasing the length of lever by 377/220 or 70% and the rear and leverage from the servo to the shoe brought up to the original front leverage from the servo to the shoe by increasing the length of lever G.100533 from 2.750 to 4.2 on 53%. With the short levers from the front equalisers forwards, therefore, the distribution of units becomes Direct 377. Servo, front & rear. On J.III the direct is brought up from 240 to 400 units by increasing lever G.55388 from 1.6 to 2.66" or 66%. The servo to front and rear is increased slightly(but only slightly, as with 524 units the 25Hp. servo comes on the stop rather early) by 5% making the servo lever to the rear G.55391, 2.38 instead of 2.25 and ther servo to the front lever G.55419 2.00" instead of 1.875. 400 D) + 334 S front + 228 S rear 440% G front av S=2 | ||
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).