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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).
Bump test performed on Derihon, Houdaille, and Berkshire brand shock absorbers.

Identifier  ExFiles\Box 25\2\  Scan114
Date  25th September 1925
  
To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from Hs{Lord Ernest Hives - Chair}/RB.{R. Bowen} X1152 25.9.25.

SHOCK ABSORBER - BUMP TEST. X1152 X8520 X4046

Derihon, Houdaille &
Berkshire.

Bump drum speed 120 - 130 r.p.m. 2" cams at 180°.
Shock absorbers run for the following times.

DERIHON. Set to drop through 20° in 25 secs. with 10 lbs. load.
Run for 2 hrs. 10 mins. - quickly became over-heated (5 mins.) and lost efficiency. Oil leaks from valve gland and filler.
Did not recover efficiency when cold and had to be re-filled and re-set.

BERKSHIRE.
20° drop in 20 secs. Run for 1 hr. 30 mins. Over-heated quickly. Oil leaks from gland. Time to drop at finish 1 sec.

HOUDAILLE.
Set to drop as follows :-
O/S at 10 lbs.
N.S. at 30 lbs.
Run for 2 hrs. Over-heated. Leaks from gland but not as bad as other makes. N/S dropped with 1 lb. on - almost recovered efficiency when cold.

2nd. test. Drum speed 60 - 80 r.p.m. Time run 15 mins (2 mins.) Became over-heated and lost efficiency, oil leaks as before - O/S shock absorber stood up to test better than N/S.

BERKSHIRE.
As before.

contd :-
  
  


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