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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).
Performance charts for a Delco II adjustable rear damper under different leak and pressure settings.

Identifier  WestWitteringFiles\V\December1930-February1931\  Scan139
Date  14th February 1931 guessed
  
SET 3 DELCO REAR DAMPER. ADJUSTABLE LEAK 12" LEVER.

Top-Left Chart:
DELCO II LOW PRESSURE
1" STROKE. N°1 LEAK.
MAX PRESSURES.
550 R.P.M. --- 115 LB/D"
450 R.P.M. --- 115 "
300 R.P.M. --- 92.5 "
200 R.P.M. --- 77 "
Y-Axis: 154 LB/D"

Top-Right Chart:
DELCO II HIGH PRESSURE
1" STROKE. N°1 LEAK.
MAX. PRESSRS
536 R.P.M. --- 970 LB/D"
450 " --- 785 "
300 " --- 693 "
200 " --- 508 "
Y-Axis: 462 LB/D"

Middle-Left Chart:
DELCO II LOW PRESSURE
1" STROKE. N°3 LEAK.
MAX. PRESSURES.
550 R.P.M. --- 115 LBS/D"
450 R.P.M. --- 100 "
300 R.P.M. --- 85 "
200 R.P.M. --- 61.5 "
Y-Axis: 154 LB/D"

Middle-Right Chart:
DELCO II HIGH PRESSURE
1" STROKE. N°3 LEAK.
MAX. PRESSURES
550 R.P.M. --- 855 LB/D"
520 R.P.M. --- 809 "
450 R.P.M. --- 740 "
300 R.P.M. --- 485 "
200 R.P.M. --- 392 "
Y-Axis: 462 LB/D"

Bottom-Left Chart:
DELCO II LOW PRESSURE
1" STROKE. N°4 LEAK.
MAX. PRESSURES.
600 R.P.M. --- 123 LB/D"
450 R.P.M. --- 100 "
300 R.P.M. --- 85 "
200 R.P.M. --- 69 "
Y-Axis: 154 LB/D"

Bottom-Right Chart:
DELCO II HIGH PRESSURE
1" STROKE. N°4 LEAK.
MAX. PRESS.
550 R.P.M. --- 715 LB/D"
450 R.P.M. --- 646 "
300 R.P.M. --- 554 "
200 R.P.M. --- 370 "
Y-Axis: 462 LB/D"
  
  


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