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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).
Comparison table of steering conversions for 40/50 models to address complaints.

Identifier  ExFiles\Box 17\3\  Scan250
Date  1st May 1928
  
40/50 CONVERSIONS FOR COMPLAINTS
AIMING AT OVER-ALL RATIO OF 15/1.

TABLE DATA:

Column Headers:
1) SERIES: V, ORIGINAL CONVERSION, CONVERSION FOR STEERING COLS. 1 AND 2., 'B' 2, CONVERSION FOR 'B' 2 SERIES., 'F' 2, CONVERSION FOR 'F' 2 SERIES., 14 EX. E.A.C. 7

Row Data:
LEAD: 1.125, .940, .825, .720, .720, .720, .720
PITCH DIA:: 1.400, 1.400, 1.400, 1.800, 1.800, 1.800, 1.800
HELIX ANGLE: 14°-20', 12°-4', 10° 36', 7° 15', 7° 15', 7° 15', 7° 15'
Nº OF STARTS: 4, 4, 4, 3, 3, 3, 3
ANGLE OF CUTTER: 29°, 29°, 29°, 29°, 29°, 29°, 29°
ROCKING LEVER: 2.300, 2.300, 2.300, 1.750, 1.750, 1.750, 1.500
PENDULUM LEVER: 9.500, 9.500, 9.500, 9.500, 11.000, 10.0, 7.500
SIDE STEERING LEVER: 8.000, 8.000, 8.000, 8.000, 9.225, 9.225, 9.500
LOCK ANGLES: L.H. 38° R.H. 32°, L.38° R.32°, L.38° R.32°, L.38° R.32°, L.38° R.32°, L.38° R.32°, L.38° R.32°
LEVERAGE: 11/1, 13.6/1, 15/1, 13/1, 13/1, 14.3/1, 16.5/1
TURNS OF WHEEL: 2, 2.4, 2.65, 2.2, 2.250, 2.350, 3.000

Bottom Section (S.S. TUBE USED, SPRING RATING, MAXIMUM MOVEMENT, STRESS):
- Column 'V':
F.5007
F.4614
3,500 LBS/''
.250" TRAVEL
- Column 'ORIGINAL CONVERSION':
N.SCH. 2258
F.76787
F.76726
1500 LBS/1"
.600
84,500
- Column 'CONVERSION FOR STEERING COLS. 1 AND 2.':
THE VERY LOW RATIO MAY REQUIRE A SIDE STEERING TUBE END MODIFICATION TO PREVENT EXCESSIVE SPONGINESS.
- Column ''B' 2':
F.4614
3.500 LBS/''
.250"
84,500
- Column 'CONVERSION FOR 'B' 2 SERIES.':
N.SCH. 2258
F.76787
1500 LBS/''
.600
84,500
- Column ''F' 2':
N.SCH. 2258
F.76787
F.76726
1500 LBS/''
.600
84,500
- Column 'CONVERSION FOR 'F' 2 SERIES.':
N.SCH. 2258
F.76787.
F.76726
1500 LBS/1"
.600
84,500.
- Column '14 EX. E.A.C. 7':
F.76108
F.76110
1400 LBS/1"
.400
84,100

Vertical Note (Column 'CONVERSION FOR 'B' 2 SERIES.'):
IN A NUMBER OF DISSATISFIED OWNERS NOT LARGE. SHORTER PENDULUM LEVERS CANNOT BE FITTED. IN EXCEPTIONAL CASES THEREFORE USE COL. 3 CONVERSION.
  
  


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