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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).
List of road springs ordered in 1930 for the Phantom II and 20 HP models.

Identifier  ExFiles\Box 16\7\  Scan348
Date  13th December 1930
  
FOR FILES.
X7410.

ROAD SPRINGS ORDERED 1930.

PHANTOM II.

X.7410.
X.5410.
X.4429.

FRONT.

19.5.30. 1 Pair 1100.
Free Camber 3.5 Pos.
Loaded Camber 1.00 Pos.
Design left to Firths.

Rm{William Robotham - Chief Engineer}4/MJ.8.10.30. 1 Pair.
Pos Camber 5.5"
Loaded Camber 5.5"
Loaded Camber Flat.
Poundage 1160.

Rm{William Robotham - Chief Engineer}1/AD.18.11.30. 1 Pair.
Free Camber 4.1.
Loaded Flat
Poundage 1100.

Rm{William Robotham - Chief Engineer}3/MJ.29.11.30.
Free Camber 4.5"
Loaded Flat.
Poundage 1100.

REAR.

Rm{William Robotham - Chief Engineer}4/AU.8.10.30. 1 Pair.
1300 lbs. 12" Pos Camber
1300 lbs @ Flat Camber.

Rm{William Robotham - Chief Engineer}4/MJ.8.10.30. 1 Pair.
Free Camber 9.75"
Loaded Camber Flat.
Poundage 1280.

Rm{William Robotham - Chief Engineer}1/AD.18.11.30.
1350 lbs. 1 Pair.
Free Camber 9.25"
Loaded Camber Flat.

Rm{William Robotham - Chief Engineer}3/MJ.29.11.30.
Free Camber 10.25.
Loaded Flat.
Poundage 1350.

20.HP.

FRONT

14.5.30. 1 Pair 675 lbs.
Free Camber 5.00" ) Pos
Loaded Camber 1.00" ) Grooved.
Tested on Bump 1.
ran 23 hours, other 41 hours.
Firth's best design.

10.7.30. 1 Pair 650 lbs.
Specification as for
springs ordered 14.5.30.

26.9.30. 650 & 625 lbs.
2 Pairs Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/
Free Camber 5" Pos) Pos.
Loaded " 1" Pos) Grooved.
1 Pair taken to U.S.A.

Rm{William Robotham - Chief Engineer}2/MJ.13.12.30. 650 lbs. 2 sets.
Initial Camber 3.375.
Loaded Camber Flat. Design C.K.

REAR.

Rm{William Robotham - Chief Engineer}4/AU.8.10.30. 820 lbs.
1 Pair Rear.
Free Camber 8.6"
Loaded Flat
1030 lbs springs at .5 Neg

Rm{William Robotham - Chief Engineer}6/AU.21.10.30.
Alteration to 700 lbs ) Temp.
20 H.P. Rear Springs ) Sch.
Free Camber 6.25 Pos ) Only.
Loaded Camber .5 Neg. )
Poundage 930

Rm{William Robotham - Chief Engineer}2/MJ.13.12.30.
950 lbs 2 Pairs.
Free Camber 5.9"
Loaded Camber .5" Neg.
  
  


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