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).
Spring chart for thrust and damper components.
| Identifier | ExFiles\Box 129\2\ scan0166 | |
| Date | 31th October 1935 | |
| TABLE OF SPRING DATA COLUMN HEADERS: Clutch Size, Th. No., Part No., Spring Pressure (lbs), Color Identity, Inserted HGT, Free HGT, Outside Dia., Wire Gauge SECTION 1 Clutch Size: 8-1/2" Th. No.: 3082 Part No.: 40306, 40308, 40532 Spring Pressure (lbs): 77-83, 91-97, 105-110 Color Identity: RED (80), BLACK (94), YELLOW (108) Inserted HGT: 1", 1", 1" Free HGT: 1-9/16", 1-37/64", 1-39/64" Outside Dia.: 1-3/16" Wire Gauge: 11 SWG .116", 11 SWG .120", 11 BWG{J. C. Bowring} .136" SECTION 2 Clutch Size: 7-1/4" Th. No.: 3083 Part No.: 40223, 40224, 40413, 40368 Spring Pressure (lbs): 62-68, 72-77, 86-91, 112-120, 136-143 Color Identity: GREY (65), YELLOW (75), DRAB(GREEN) (88), YELLOW (117), RED (138) Inserted HGT: 1-3/8" Free HGT: 1-55/64", 1-57/64", 1-57/64", 2-1/16", 2-1/16" Outside Dia.: 1-1/32" Wire Gauge: 9 SWG .144", 9 SWG .144", 9 SWG .144", 9 SWG .144", 9 SWG .144" SECTION 3 Clutch Size: 9" Th. No.: 3082 Part No.: 40411, 40226, 40410, 40780 Spring Pressure (lbs): 104-110, 120-126, 128-136, 175-180 Color Identity: YELLOW (107), ORANGE (123), BLUE (132), GREEN (178) Inserted HGT: 1-17/32" Free HGT: 2-7/32", 2-17/32", 2-5/16", 2-31/64" Outside Dia.: 1-1/8" Wire Gauge: 8 BWG{J. C. Bowring} .158", 8 BWG{J. C. Bowring} .158", 8 BWG{J. C. Bowring} .158", 8 BWG{J. C. Bowring} .188" SECTION 4 Clutch Size: 10" (Note: 24/5 - 25/30 -B) Th. No.: 3084 Part No.: 40419, 40930, 40948, 40995, 40996, 40997, 40998, 40999, 41000, 41001, 40421 Spring Pressure (lbs): 90-95, 106-113, 125-135, 140-147, 147-153, 155-160, 185-190, 195-200, 210-220, 235-240 Color Identity: ORANGE (93), YELLOW (110), ORANGE (130), YELLOW (144), BROWN (150), GREEN (158), BLACK (188), LIGHT BLUE (198), BLUE (215), (238) Inserted HGT: 1-11/16" Free HGT: 2-15/32", 2-11/16", 2-11/16", 2-11/16", 2-13/16", 2-15/16", 2-7/8", 2-1/8", 2-13/16", 2-23/32" Outside Dia.: 1-1/8" Wire Gauge: 8 BWG{J. C. Bowring} .158", 8 BWG{J. C. Bowring} .158", 8 BWG{J. C. Bowring} .158", 8 BWG{J. C. Bowring} .160", 7 SWG .176", 7 SWG .176", 7 SWG .176", 7 SWG .176", 7 SWG .176", 7 SWG .176" SECTION 5 Clutch Size: 9" 1/4" Th. No.: 3085 Part No.: 41022, 41117 Spring Pressure (lbs): 345-350, 345-360 Color Identity: YELLOW (348), YELLOW (348) Inserted HGT: 2-7/32" Free HGT: 3-5/8", 3-5/8" Outside Dia.: 1-5/64" Wire Gauge: 5 STUD. .204", 5 SWG .192" SECTION 6 Clutch Size: 10" Th. No.: 3082 Part No.: 41120, 41121 Spring Pressure (lbs): 140-150, 190-200 Color Identity: BUFF (145), RED (195) Inserted HGT: 2-1/8" Free HGT: 3-1/2", 3-1/2" Outside Dia.: 1-5/16" Wire Gauge: 8 SWG .167", 8 SWG .197" SECTION 7 Clutch Size: 10" 1-1/4" -11 Th. No.: 3516 Part No.: 40992, 40993, 40994, 40995, 41116, 41118, 41219 Spring Pressure (lbs): 125-133, 137-145, 177-183, 207-210, 250-260, 305-310, 345-360 Color Identity: GREY (130), BLUE (142), RED (180), GREEN (208), PINK (255), YELLOW, YELLOW (355) Inserted HGT: 2-5/8" Free HGT: 4", 4-1/8", 4-1/8", 4-1/16", 3-15/32", 3-15/32" Outside Dia.: 1-5/16" Wire Gauge: 7 SWG .176", 7 SWG .176", 7 SWG .176", 6 SWG .192", 5 SWG .212", 4 SWG .232" SECTION 8: THRUSTFUL SPRINGS Part No.: 40387, 40524, 40525, 40788, 41111, 41112, 41218, 41219 Spring Pressure (lbs): 54-58, 107-117, 122-132, 132-146, 154-166, 178-186, 185-190, 190-196 Color Identity: ORANGE (56), PINK (112), BLACK (128), RED (139), GREEN (160), GREY (183), GREY (188), BUFF (173) Inserted HGT: .562", .718", .812", .812", .812", .812", .812", .812" Free HGT: 1-1/16", 1.073", 1.097", 1-3/32", 1-3/32", 1-5/64", 1-3/64", 1/8" Outside Dia.: 45/64" Wire Gauge: 10 BWG{J. C. Bowring} .134", 10 BWG{J. C. Bowring} .134", 10 BWG{J. C. Bowring} .134", 10 BWG{J. C. Bowring} .134", 10 SWG .128", 11 SWG .116", 11 SWG .116", 10 SWG .128", .124" SECTION 9: DAMPER SPRINGS Th. No.: 3316 Part No.: 40824, 40825 Spring Pressure (lbs): 220-245, 275-295 Color Identity: WHITE (233), WHITE (285) Inserted HGT: 1.01", 1.01" Free HGT: 1-3/32", 1.097" Outside Dia.: (Blank) Wire Gauge: .250", .262" DOCUMENT FOOTER Notes (Bottom Left): All Dimensions ± .015 Unless Otherwise Stated. All Corners Free From Fraise. Work to Dimensions. Do Not Scale. This Print supersedes any issued previous to latest alteration date. It is Our Property and must be returned upon request. This Part must not be sold to any other concern. F = Good Finish O = Rough G = Ground ⨁ = Machine All Over Title Block (Bottom Right): BORG AND BECK CO. LTD. LEAMINGTON SPA. ENGLAND. DESCRIPTION: SPRING CHART - THRUST & DAMPER PART NO.: 40738/3 NO. OFF PER SET DRAWN, TRACED, CHECKED, PASSED, DATE ISSUED, MATERIAL, SPECIFICATION. Alteration Block: ALTERATIONS READ UP ALTERATION | No. | DATE COLOURS REVISED & DAMPER SPRING PART N. 41219 ADDED | 458 | 31.10.35 - | 376 | 5.4.35 - | 362 | 28.2.35 - | 299 | 3.10.34 Miscellaneous Text: FORM D 14/B (Top Right) | ||